Patent Publication Number: US-11034486-B2

Title: Dispenser and process

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     The present application is a continuation patent application of and claims priority to U.S. patent application Ser. No. 12/362,062 and claims the benefit of U.S. Patent Application No. 61/024,386, which applications are incorporated by reference herein and made a part hereof. 
    
    
     FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT 
     None. 
     TECHNICAL FIELD 
     The invention relates generally to a dispenser for a flowable material or substance and more particularly, to a dispenser having a membrane having enhanced rupturing characteristics for allowing a flowable substance to be contained and dispensed as desired. 
     BACKGROUND OF THE INVENTION 
     Containers capable of dispensing contents stored in the containers are known in the art. In certain applications, a dispenser may have a membrane that is selectively rupturable wherein upon rupture, a flowable substance can be dispensed from the container. For example, U.S. Pat. Nos. 5,490,746 and 5,664,705 disclose containers having rupturable membranes. The disclosed membranes, however, are made rupturable via score lines in the membranes. As are known in the art, score lines are weakened areas, typically formed by the removal of material. The membranes are ruptured by creating hydraulic pressure within the container where the membranes rupture along the score lines. Furthermore, in the membrane disclosed in U.S. Pat. No. 5,664,705, portions of the membrane overlap one another and the membrane is not integral with the dispenser but rather separately affixed to the dispenser wall. The use of score lines provides less control over the manner in which the membrane will rupture. In addition, separately attaching a membrane to a container adds to the complexity of the manufacturing process and cost. In other embodiments, the membrane may be generally flat or planar and have a weld seam that provides for the rupturability of the membrane. Limitations in the structural configuration of the prior art rupturable membranes can restrict the operability of the membrane and the type of flowable substances that can be suitably contained and dispensed from the container. 
     While such containers according to the prior art, provide a number of advantageous features, they nevertheless have certain limitations. The present invention is provided to overcome certain of these limitations and other drawbacks of the prior art, and to provide new features not heretofore available. A full discussion of the features and advantages of the present invention is deferred to the following detailed description, which proceeds with reference to the accompanying drawings. 
     SUMMARY OF THE INVENTION 
     The present invention provides a dispenser having a membrane having enhanced rupturing characteristics for dispensing flowable materials. 
     According to a first aspect of the invention, a dispenser is provided for dispensing flowable material. The dispenser has a container having an outer wall and a membrane collectively defining a chamber configured to contain a flowable material. The membrane extends from the outer wall at an angle. The membrane has a thickness and a weld seam. The weld seam has a thickness less than the thickness of the membrane. 
     According to another aspect of the invention, the membrane is generally conically-shaped. In one exemplary embodiment, the membrane has a peripheral edge and an apex spaced from the peripheral edge. The peripheral edge is integral with the outer wall. 
     According to another aspect of the invention, the angle the membrane extends from the outer wall is in the range from approximately 19° to 25°. In a further exemplary embodiment, the angle is in the range from approximately 20° to 22.5°. In still a further exemplary embodiment, the angle is approximately 22.5°. These angles may be referred to as cone angles. 
     According to another aspect of the invention, the weld seam has a thickness in the range of approximately 0.003 inches to 0.004 inches. In an exemplary embodiment, the weld seam has a thickness of approximately 0.0035 inches. In other exemplary embodiments, the weld seam has a thickness of approximately 0.006 inches. 
     According to a further aspect of the invention, the membrane converges to an apex and has a plurality of weld seams converging to the apex. 
     According to a further aspect of the invention, the outer wall has a first extension member thereon proximate the membrane. The outer wall further has a second extension member thereon proximate the membrane and generally opposite the first extension member. 
     According to yet another aspect of the invention, the dispenser is formed by an injection-molding process. In one exemplary embodiment, the dispenser is formed of various thermoplastic materials and various combinations thereof. 
     According to another aspect of the invention, a membrane has a web of material that is generally conically-shaped. The web has a thickness and a weld seam wherein the weld seam has a thickness less than the thickness of the web. 
     According to other aspects of the invention, methods of dispensing are disclosed using the dispenser as well as a method of forming the dispenser. 
     According to a further aspect of the invention, the dispenser has a conically-shaped membrane positioned at a proximal end of the dispenser. The membrane is fully exposed to an outside environment. 
     According to another aspect of the invention, a container assembly is provided wherein a first container is positioned within a second container. Each container may have an angled or conically-shaped membrane. The membranes are ruptured wherein flowable substances contained within the containers mix to form a mixture. The mixture can then be dispensed from the container assembly. 
     According to a further aspect of the invention, the dispenser may have multiple chambers and multiple conically-shaped membranes. 
     Other features and advantages of the invention will be apparent from the following specification taken in conjunction with the following drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       To understand the present invention, it will now be described by way of example, with reference to the accompanying drawings in which: 
         FIG. 1  is a perspective view of a dispenser according to the present invention; 
         FIG. 2  is a top plan view of the dispenser of  FIG. 1  prior to sealing a distal end of the dispenser; 
         FIG. 3  is a cross-sectional view of the dispenser taken along lines  3 - 3  in  FIG. 2 ; 
         FIG. 4  is an enlarged partial cross-sectional view of a membrane taken of the area indicated in  FIG. 3 ; 
         FIG. 5  is another enlarged partial cross-sectional view of the membrane; 
         FIG. 6  is an end view of the membrane of the dispenser; 
         FIG. 7  is a cross-sectional view of a mold line or weld seam shown in  FIG. 6 ; 
         FIG. 8  is a schematic end view of an alternative embodiment of the dispenser of the present invention; 
         FIG. 9  is an end view of the membrane having forces applied thereto wherein the membrane is fractured along mold lines or weld seams; 
         FIG. 10  is a partial elevation view of the dispenser supporting a swab assembly; 
         FIG. 11  is a partial elevation view of the dispenser supporting a dropper assembly; 
         FIG. 12  is a partial elevation view of the dispenser supporting a brush assembly; 
         FIG. 13  is a partial elevation view of the dispenser supporting a roller assembly; 
         FIG. 14  is a perspective view of a core pin having an end face with a raised structure; 
         FIG. 15  is a schematic cross-sectional view of a mold and a portion of the material for forming the dispenser; 
         FIG. 16 a -16 f    are a series of views showing the injection molding process of the membrane wherein adjacent mold segments abut to form mold lines or weld seams; 
         FIG. 17  is a schematic view of the dispenser being filled with a flowable substance or flowable material by a filling apparatus; 
         FIG. 18  is a partial schematic view of a sealing apparatus for sealing a distal end of the dispenser to contain the flowable substance; 
         FIG. 19  is a cross-sectional view of the dispenser of the present invention holding a flowable substance; 
         FIG. 20  is a cross-sectional view of the dispenser of the present invention showing a user rupturing the membrane of the dispenser; 
         FIG. 21  is a partial cross-sectional view of an alternative embodiment of the dispenser; 
         FIG. 22  is a perspective view of another embodiment of a dispenser according to the present invention; 
         FIG. 23  is an end view of the dispenser of  FIG. 22 ; 
         FIG. 24  is a cross-sectional view of the dispenser taken along lines  24 - 24  in  FIG. 23 ; 
         FIG. 25  is a cross-sectional view of the dispenser of  FIG. 23  and showing a user rupturing the membrane of the dispenser; 
         FIG. 26  is an end view of the ruptured dispenser of  FIG. 25 ; 
         FIG. 27  is a cross-sectional view of another embodiment of the dispenser of the present invention; 
         FIG. 28  is a cross-sectional view of another embodiment of the dispenser of the present invention; and 
         FIG. 29  is a cross-sectional view of another embodiment of the dispenser of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     While this invention is susceptible of embodiments in many different forms, there are shown in the drawings and will herein be described in detail preferred embodiments of the invention with the understanding that the present disclosure is to be considered as an exemplification of the principles of the invention and is not intended to limit the broad aspect of the invention to the embodiments illustrated. 
     Referring to the drawings,  FIG. 1  discloses a dispenser according to the present invention generally designated by the reference numeral  10 .  FIGS. 2 and 3  show a container assembly  12  or container  12  prior to having one end sealed as will be described in greater detail below. As shown in  FIGS. 2 and 3 , the dispenser  10  generally comprises a container  12  with an elongated, longitudinal axis L having a peripheral wall  16 , or outer wall  16 . In one preferred embodiment, the container assembly  12  is cylindrical. However, the container assembly  12  can be molded in numerous shapes, including an elliptical shape, rectangular shape or other various cross-sectional shapes. As will be described in greater detail below, in one exemplary embodiment, the dispenser  10  is generally an integral, one-piece structure formed by an injection-molding process. It is understood that the length of the container  12  can vary depending generally on the desired volume capacity. 
     As further shown in  FIGS. 2 and 3 , the container assembly  12  generally comprises the outer wall  16  and a web  34  or membrane  34 . The outer wall  16  and the membrane  34  are preferably integral. As explained in greater detail below, the outer wall  16  and the membrane  34  are operably connected to cooperatively define a chamber  18 . As will be explained, the container assembly  12  of the dispenser  10  can have a single chamber  18  or multiple chambers can also be defined within the container assembly  12 . 
     As further shown in the exemplary embodiment of  FIG. 3 , the membrane  34  is positioned along the longitudinal axis L between a proximal end  24  and distal end  26  to define the first chamber  18  between the membrane  34  and the distal end  26 . A second chamber  20  is also defined between the membrane  34  and the proximal end  24 , and may also be referred to as a mixing chamber  42 . The outer wall  16  is sealed together at the distal end  26  by any number of known sealing methods, including heat or adhesive sealing (See  FIG. 18 ). Alternatively, the distal end  26  can receive a cap to close the first chamber  18 . When the distal end  26  is sealed, and in cooperation with the membrane  34 , the first chamber  18  is a closed chamber for holding a flowable material or flowable substance. As also shown in  FIG. 3 , the container  10  can be necked down wherein the second chamber  20  and, if desired, a portion of the first chamber  18  can have a smaller diameter than the majority of the first chamber  18 . Alternatively, the container  10  can have a constant diameter along its longitudinal axis L. 
     In one exemplary embodiment, the membrane  34  can be formed extending from the outer wall  16  at an angle. In particular, the membrane can be in a conical or spherical shape. As explained in greater detail below, this configuration provides certain unexpected results and benefits. In the disclosed configuration, the membrane  34  extends from the outer wall  16  of the container  10  at an angle, which may be referred to as a cone angle. The angle of the membrane may also be considered from a straight or vertical axis. The membrane  34  is formed in a configuration that is generally not flat or planar. As depicted in  FIGS. 3 and 4 , the membrane  34  is formed with abutting mold segments  60 ,  62 . The membrane  34  may have a membrane thickness t 1 . As explained in greater detail below, the mold segments  60 ,  62  are formed together that abut to form a weld seam  40 , with a thickness t 2  (shown in  FIG. 5 ). The thickness t 2  may be increased over prior designs and can be set at approximately 0.006 inches or be set at a traditional 0.003 to 0.004 inches but wherein such thickness requires less force for rupture as explained in greater detail below. The mold segments  60 ,  62  are formed at an angle A as shown in  FIGS. 3 and 4 . Testing including finite element analysis has shown that the angle A can be at various angle ranges and in certain exemplary embodiments, the angle A is 20° or 22.5° as shown measured in  FIG. 4 . The angle can be measured from a vertical axis passing through an end or apex of the membrane. This angle is also the angle that the membrane  34  extends forward from the outer wall  16  of the dispenser  10 . Other ranges are also possible such as between 20° to 25° or 5° to 40°. Broader ranges are also possible. Thus, the overall shape of the membrane  34  may be considered conical in one exemplary embodiment rather than generally flat, planar or straight as in prior designs. Described somewhat differently, the membrane has a peripheral edge  42  and an apex  44 . The apex  44  is spaced from the peripheral edge  42 . Thus, the peripheral edge  42  of the membrane  34 , which is integral with the outer wall  16  in an exemplary embodiment, is positioned at one location along the longitudinal axis L of the container  12  while the apex  44  is positioned at another location along the longitudinal axis L of the container, thus spaced linearly away from the peripheral edge  42 . The mold segments  60 , 62 , or membrane sections, extend from the peripheral edge  42  and converge to the apex  44 . It is also understood that the membrane  34  can be angled but wherein the membrane segments do not converge to an apex. The apex could also be positioned at a location other than a general center of the membrane if desired. In an exemplary embodiment, the apex  44  is positioned at a center of the membrane  34 . Alternatively, the membrane  34  can have a curvilinear shape such as a dome shape (not shown). 
     As further shown in  FIG. 6 , the membrane  34  contains a plurality of rupturable members in the form of weld seams  40 , which can be arranged in a number of configurations including but not limited to a cross, star, or asterisk. It is understood, further, that the benefits of the invention can be realized with a single weld seam  40  in the membrane  34 . In a preferred embodiment, the weld seams  40  are collectively arranged in a plus-shaped configuration wherein the membrane generally has a pie-shape. As shown in  FIGS. 5 and 7 , adjacent mold segments  60 ,  62  from an injection molding process abut with one another to form the weld seams  40 . Due to the configuration of the mold to be described below, the weld seams  40  are formed to have a lesser thickness t 2  than the membrane thickness t 1 . As further shown in  FIG. 6 , the plurality of weld seams  40  extend radially from substantially a center of the membrane  34  (which may correspond to the apex  44 ) on the membrane  34  completely to an outer edge or the peripheral edge  42  of the membrane  34 , and to the interior surface of the container  12 . It is understood, however, that the weld seams  40  do not need to extend to the peripheral edge  42  of the membrane  34 . While a membrane containing weld seams  40  is preferred, it is understood that the rupturable members can take other forms to otherwise form a weakened member. Weakened members can take various forms including frangible members, thinned members, or members formed by other processes, such as scoring. 
     The membrane  34  is similar to the membrane structure disclosed in U.S. Pat. No. 6,641,319, which is incorporated herein by reference. In a most preferred embodiment, the membrane  34  has four mold segments and wherein the weld seams  40  generally form a cross or + shape. As shown in  FIG. 16 a   , the process is controlled such that the adjacent mold segments  60 ,  62  each meet at the separate interface areas  64 . Each weld seam  40  has a thickness less than the thicknesses of the segments  60 , 62 . The thicknesses of the mold segments  60 , 62  are considered to be the membrane thickness t 1  and the weld seams  40  are referred to with the thickness t 2  ( FIGS. 5 and 7 ). It is understood that the membrane  34  having the weld seams  40  is formed in the conical or tapered shape as shown in  FIGS. 3 and 4 . 
     Compression of the container  12  proximate the membrane  34 , such as by finger pressure, causes the membrane  34  to break, rupture, or fracture only along the radial depressions or weld seams  40  forming a series of finger-like projections  39  which are displaced from one another ( FIG. 9 ) and upon sufficient force can be in overlapping fashion to create membrane openings  41  for release of the material from the first chamber  18  into the second chamber  20 , which may also be referred to as a mixing chamber  20 . Because of the structure of the weld seams  40 , squeezing the container  12  towards the distal end to create hydraulic pressure against the membrane  34  will not break or rupture the weld seams  40 . Since the projections  39  are “pie-shaped” and widest at their outer edges  37 , the center section of the web  34  breaks open the widest. The amount of material that can be dispensed through the web  34  is controlled by the degree of the opening  41 . The size of the opening  41  is controlled by the configuration of the weld seams  40  and the pressure of the fingers of the user pressing on the container assembly  12  to assert pressure on the web  34 . Rupturing of the membrane  34  will be described in greater detail below. The resiliency of the material of the dispenser  10  allows the membrane  34  to return substantially to a closed position when force is removed from the dispenser  10 . The angled configuration of the membrane  34  provides a rupturing force to be less than prior designs. This provides certain advantages as described in greater detail below. 
     As further shown in  FIGS. 3-7 , the web  34 , or membrane  34 , partitions the container assembly  12  to separate the first chamber  18  from the second chamber  20  or mixing chamber  20 . Although  FIG. 3  shows the membrane  34  closer to the proximal end  24  than the distal end  26 , the placement of the membrane  34  is a function of the desired volume capacity of the respective chambers. As such, the membrane  34  could be located at numerous locations in the container assembly  12 . In one embodiment, the membrane  34  could be positioned at an end of the dispenser  10  whereby the second chamber  20  or mixing chamber  42  is eliminated. Such an embodiment will be described in greater detail below. 
     As shown in  FIGS. 3 and 4 , the membrane  34  has a first surface  36  and a second surface  38 . The first surface  36  faces towards the first chamber  18 , while the second surface  38  faces towards with the second chamber  20 . The second surface  38  is angled but has a generally smooth surface. The first surface  36 , however, has a plurality of bands or depressions thereon formed by the weld seams  40 . As will be described in greater detail below, and as generally shown in  FIGS. 5-6, and 14-16 , a first segment  60  of injected molded material abuts a second segment  62  of injected molded material to form the weld seam  40 . As can be further seen in  FIG. 5 , the membrane  34  has a base thickness “t 1 ” between the first membrane surface  36  and the second membrane surface  38 . The thickness t 1  is generally referred to as the membrane thickness. The weld seam  40  has a thickness t 2  that is less than the membrane thickness t 1 . This facilitates rupture of the membrane  34  as described below. The first mold segment  60  and the second mold segment  62  abut to form the weld seam  40 . During the molding process, the mold segments  60 , 62  move toward the interface area  64  in the directions of arrows B ( FIG. 5 ). Furthermore, the mold segments  60 ,  62  meet substantially at the interface area  64  at the lesser thickness t 2 . This forms the weld seam  40  at the lesser thickness facilitating rupture of the membrane  34 . If the mold segments  60 ,  62  did not meet at the interface area  64  but, for example, substantially further to either side of the interface area  64 , the weld seam  40  would be too thick and would not be able to rupture. Whichever mold segment  60 ,  62  moved past the interface area  64 , the segment would merely flex and not rupture as desired. Thus, as described below, the molding process is controlled to insure that the mold segments  60 ,  62  abut substantially at the interface area  64  to form the weld seam  40  having a thickness t 2  less than the membrane thickness t 1 . With the angled membrane  34 , the thickness t 2  can be increased over previous designs while still providing for easy selective rupture by a user as discussed further below. 
     Explained somewhat differently, the first surface  36  of the membrane  34  has a channel  66  formed therein ( FIG. 7 ). The weld seam  40  confronts the channel  66 . The channel  66  is formed by a first wall  68  adjoining a second wall  70 . In a preferred embodiment, the first wall  68  adjoins the second wall  70  at substantially a 90 degree angle. Acute angles or obtuse angles are also possible. Thus, in one preferred embodiment, the channels are V-shaped. 
     In another preferred embodiment, the membrane  34  forms four narrow spokes of substantially uniform width extending from substantially the center of the membrane  34  to the interior surface of the container assembly  12 , or towards the inner surface of the outer wall  16 . Each spoke extends at a certain angle from the adjacent spokes on either side. In other embodiments, the number of spokes can be increased or decreased as desired. 
     As shown in  FIGS. 1-2 , the exterior surface  28  of the container assembly  12  has an exterior extension  46  to indicate the exact location where force should be applied to rupture the membrane  34 . The exterior extension  46  is generally positioned proximate the membrane  34 . Specifically, the extension  46  is located directly adjacent to the membrane  34 . Although the extension  46  is shown as a thumb pad with a plurality of ridges  47 , any type of raised area or projection including a button, prong or ring will suffice. In another embodiment, as depicted in  FIG. 21 , the tube can be outfitted with first and second finger exterior extensions  46  to provide the user with further direction as to where force should be applied to rupture the membrane  34 . In addition, a ring of material could be applied around the perimeter of the container assembly  12  corresponding to the location of the web  34  so that a user would know precisely where to apply finger pressure. Any indicia-bearing marking would also be sufficient. Additional exterior extensions  46  can be used if desired. The exterior extensions  46  or other indicia could also be eliminated from the design if desired. 
     As shown in  FIGS. 3 and 4 , the interior surface  28  of the second chamber  20 , which may also be considered a dispensing chamber, may include ribs  48 . In one preferred embodiment, the ribs  48  may take the form of circumferential ribs  48 . As shown in an alternative embodiment of  FIG. 8 , the interior surface  28  of the dispensing chamber  42  has a plurality of longitudinal ribs  48  that extend longitudinally along the interior surface  28 . The ribs  48  are thus oriented axially in the dispensing chamber  42  and can be of varying length. The ribs  48  could be shortened and extend radially inwardly. The ribs  48  secure different applicators  44 , such as a swab  49  ( FIG. 10 ) or dropper  50  ( FIG. 11 ), a brush  51  assembly ( FIG. 12 ), or a roller  53  assembly ( FIG. 13 ) which can be used to apply the dispensed liquid or solid flowable material. The different applicators may form an interference fit with the ribs  48 . The different applicators  44  are in communication with the second chamber  20  or dispensing chamber  20  as shown in  FIGS. 10-13 . 
     As further shown in  FIG. 10  the swab  49  engages the inner surface  28  of the dispensing chamber. Once the membrane  34  is fractured as described, the swab  49  receives and absorbs the material M as it is dispensed from the first chamber  18  and enters the dispensing chamber  20 . The swab  49  has a contact surface that is used to dab a desired area such as a skin surface having an insect bite. The dispenser  10  can be inverted and squeezed until the swab  49  surface is wet. The dispenser  10  can then be held in a vertical position with the swab  49  pointed upwardly. Alternatively, the swab  49  can be made of a material of relatively large porosity for passing droplets through the swab  49  by gravity and for dispensing droplets from its exterior surface. The swab  49  can be made of polyester, laminated foamed plastic, cotton or the like. 
       FIG. 11  shows the dispenser  10  having a dropper attachment  50 . The second chamber  20  has a dropper  50  attached thereto. The dropper  50  has an elongated spout  52  with a passageway  54  for dispensing droplets of the material. The dropper  50  has a cup-like portion  56  that overlaps a portion of the outer surface of the second chamber  20 . Once the membrane  34  is ruptured as described and material passes from the first chamber  18  to the dispensing chamber  20 , droplets of the material can be dispensed through the spout  52 . The dispenser  10  can be similarly manipulated to dispense the flowable material using the different applicators of  FIGS. 11-13 . 
     In a preferred embodiment, the dispenser  10  is made of thermoplastic material. The material could be transparent, translucent or opaque. The preferred plastic material is polyethylene or polypropylene but a number of other plastic materials can be used. For example, low-density polyethylene, polyvinyl chloride or nylon copolymers can be used. In a preferred embodiment, a mixture of polypropylene and polyethylene copolymer or thermoplastic olefin elastomer is used. In another preferred embodiment, a mixture of polypropylene and Flexomer®, available from Dow Chemical, is utilized. In addition, low density polyethylene with linear low density polyethylene can be used. It is essential that the dispenser be made of material which is flexible enough to allow sufficient force to rupture the membrane  34 . Also, in a preferred embodiment, the dispenser is a one-piece integrally molded member. Due to the enhanced features of the conical membrane  34 , additional blends of polyethylene and polypropylene can be used that could not previously be used due to limitations such as in the molding capabilities of the materials in forming the dispenser or rupturability of the weld seams once the membrane is formed. For example, blends with an increased amount of polypropylene can be used with the angled or conical membrane as the membrane can be readily ruptured, and such blends further provide increased chemical resistant properties. With increased chemical resistance, the dispenser can be used to contain a wider variety of flowable substances. In prior designs utilizing such percentages of polypropylene, the membrane was not capable of being ruptured via finger pressure. A dispenser made solely of nylon is also possible. 
     The preferred dispenser  10  has a length of about 1.5 to about 3.0 inches, although larger containers can be utilized, with 2 to about 2.5 inches being preferred. The outside diameter of the container assembly is about 0.30 to about 1.0 inches. 
     The exterior extension  46  is preferably about 0.10 to about 0.50 inches in width and about 0.010 to 0.125 inches thick. The second chamber  20  is preferably about 0.20 to about 1.5 inches and preferably 0.75 inches in length. The membrane  34  preferably has a thickness of about 0.02 to about 0.0625 inches. The weld seams  40  have a preferable thickness of about 0.003 to about 0.008 inches and preferably about 0.003 to 0.004 inches. In another exemplary embodiment, the weld seam  40  thickness may be 0.006 inches. The above dimensions can be varied depending upon overall dispenser size. 
     The method of making the dispenser  10  is generally illustrated in  FIGS. 14-16  and is similar to the process described in U.S. Pat. No. 6,641,319. The dispenser  10  is preferably produced in a single molding operation thus providing a one-piece injected-molded part. As shown in  FIG. 15 , a mold  80  is provided having a mold cavity  82  therein. The mold cavity  82  is dimensioned to correspond to the exterior surface of the dispenser  10 . A first core pin  84  and a second core pin  86  are provided. The core pin  84  is dimensioned to correspond to the interior surface of the dispenser  10 . It is understood that the core pin could have a shoulder to form the tapered portion, or necked-down portion of the dispenser  10 . Alternatively, the core pin could have a constant diameter if there is to be no tapered portion (different core pin options are shown in  FIGS. 14-15 ). 
     As shown in  FIGS. 14 and 15 , the first core pin  84  has an end face  88  that is angled or conically-shaped. The end face  88  also has raised structures  90  thereon. The second core pin  86  has an end face  100  that is generally recessed. The raised structures  90  on the first core pin  84  are in the form of a ridge  92 . The ridge  92  is what provides for the depressions or weld seams  40  at the certain thickness in the membrane  34 . In a preferred embodiment, the ridge has a first wall  94  adjoining a second wall  96  to form a line  98 . 
     Furthermore, in a preferred embodiment, the ridge  92  comprises a plurality of ridges radially extending substantially from a center point of the end face  88 . The ridges  92  define a plurality of membrane segments, or mold gaps  93 , between the ridges  92 . Thus, it can be understood that the raised structure  90  in the form of the ridges  92  provides the corresponding structure of the membrane  34 . Although shown as triangular, the ridges  92  can be formed in a number of shapes. In addition, the ridges  92  can be arrayed in a multitude of shapes, including a single line, a cross, a star, or an asterisk. Varying the shape of the ridges  92  will affect the shape of the channels  66  in the membrane  34 . 
     The first core pin  84  is inserted into the mold  80  with the raised structure  90  facing into the mold cavity  82 . A first space  104  is maintained between the mold  80  and the length of the first core pin  84 . The second core pin  86  is also inserted into the mold cavity  82  wherein a second space  106  is maintained between the mold  80  and the second core pin  86 . The core pins  84 ,  86  are generally axially aligned wherein the end face  88  of the first core pin  84  confronts the end face  100  of the second core pin  86  in spaced relation. Thus, a membrane space  108  is defined between the respective end faces  88  and  100  of the core pins  84  and  86 . End plates  110 ,  112  are installed on end portions of the mold  80  to completely close the mold. An exterior extension cavity  117  is located on the surface of the mold  80  and adjacent to a membrane space  108 . 
     As shown in  FIG. 15 , molten thermoplastic material is injected into the mold cavity  82  through an inlet  114 . The material flows into the first space  104 , second space  106 , and membrane space  108 . The plastic injection is controlled such that the plastic enters the membrane space  108  simultaneously in the circumferential direction. The raised structures  90  separate the material into separate mold segments  60 ,  62  that flow into the mold gaps. As shown in  FIGS. 15 and 16 , the mold segments  60 ,  62  flow first into the wider portions of the mold gaps  93  as this is the area of least resistance. The material continues to flow into the membrane space  108  and then the adjacent mold segments  60 ,  62  abut at the interface area  64  to form the weld seams  40 . As can be appreciated from  FIG. 15 , the weld seams  40  have a lesser thickness than the membrane thickness. The mold segments  60 , 62  meet and abut at the interface area  64  to form the weld seam  40 . It is understood that the membrane space  108  is angled thus forming the angled membrane  34 . During this process, air is vented from the mold cavity  82  as is conventional. 
     Once the plastic injection is complete, the material is allowed to cool. A cold water cooling system  116  could be utilized wherein cold water is pumped into the mold  80  outside of the cavity  82  if desired. Once cooled, the dispenser  10  can be removed from the mold  80 . 
     As shown in  FIG. 17 , the dispenser  10  can be passed on to a filling apparatus  120 . The dispenser  10  is then filled with flowable material. As shown in  FIG. 18 , the distal end  26  of the dispenser  10  is sealed by heat sealing dies  198 . The excess end portion can then be cut-off and discarded. It is understood that heat sealing is one preferred seal while other sealing methods could also be utilized. 
     Thus, a one-piece injection molded dispenser is provided. The one-piece construction provides a more repeatable part and at greater manufacturing efficiency than providing a separate piece that is secured into a container assembly. If desired, however, the membrane  34  could be separately molded and affixed into a container assembly  12 . A one-piece molding process, however, is preferred. In addition, because the membrane  34  is molded to have the weld seams, radial depressions, or bands, an additional manufacturing step such as scoring to create a weakened rupturable member is unnecessary. This allows the manufacture of dispensers having relatively small diameters since there is no need to allow sufficient clearance for a scoring tool. In such small configurations, it is difficult to control the scoring operation. By forming the depressions by injection molding, the desired thicknesses can be closely controlled. The membrane  34  also resists rupture from hydraulic pressure while being easily rupturable when forces are applied to the membrane. Also, the construction of the membrane  34  allows for the precise control of material to be dispensed by controlling the amount of force on the membrane  34 . It is further understood that the depressions or channels could be formed on both sides of the membrane  34  if desired. In such configuration, however, the ability of the membrane to also function as a check valve is lessened. In a preferred embodiment, however, the membrane has the depressions molded on only one side. It is further understood while certain dimensions are preferred for certain embodiments, dispensers of all sizes having similar relative dimensions can be formed according to the present invention. It is also understood that in certain embodiments of the multi-chambered dispenser, the rupturable member could be other than a weld seam if desired. For example, a scored line could be provided, a frangible seam, or other rupturable member. 
       FIGS. 19-20  disclose operation of the dispenser  10  after being filled and sealed as shown in  FIGS. 17 and 18 . In operation, a user applies a selective force F on the dispenser  10  at the exterior extension  46  adjacent to the membrane  34 . When sufficient force F is applied, as shown in  FIG. 20 , lateral pressure is applied to the membrane  34  causing the membrane  34  to shear, rupture or fracture along the weld seams  40 . The membrane  34  ruptures only along the weld seams  40  to create the membrane openings  41 . The angled membrane  34  provides a distinct audible “popping” sound when rupturing. It has further been found that the angled membrane  34  with the weld seam  40  provides a more distinct audible sound. Upon rupture of the membrane  34 , material passes from the first chamber  18  through the membrane  34  and into the second chamber  20  or dispensing chamber  20 . The material flow rate through the membrane  34  and into the dispensing chamber  20  is controlled by the degree of membrane opening which is directly related to the amount of force F applied to the membrane  34  by the user. Therefore, the user can precisely regulate the flow of material after rupture of the membrane  34 . In addition, the membrane  34  can preferably have elastic characteristics wherein when force F is removed, the membrane  34  returns substantially to its original position. While the weld seams  40  may be ruptured, the segments  60 ,  62  can form a close enough fit to prevent material from flowing past the membrane  34  without additional pressure on the material. Thus, the membrane  34  can act as a check valve to prevent unwanted flow of the material back into the first chamber  18 . 
     As explained in greater below, the present design unexpectedly yielded a design that would rupture upon the application of force F, wherein the force F was less than the force required to rupture the membrane disclosed in the &#39;319 patent discussed above. This provides additional options for the dispenser  10  such as a membrane that is more easily rupturable or a membrane that has a thickened weld seam  40  but that still allows easy rupture via finger pressure as shown in  FIG. 20 . Additional material options also become possible with the conical membrane  34 . 
       FIG. 21  discloses another embodiment of the dispenser  10  of the present invention. It is understood that the dispenser shown in  FIG. 21  has an angled membrane  34  as described above. The dispenser  10  has a first exterior extension  46  and a second exterior extension  46 . The pair of exterior extensions  46  are positioned generally in opposed relation at opposite ends of the membrane  34 . As discussed, the angled membrane  34  provides for a lesser lateral force for rupturing the membrane  34 . The pair of exterior extensions  46  provide additional material proximate the membrane  34  to reduce the chances of an inadvertent rupture of the membrane  34 . In operation, a user applies finger pressure at each exterior extension  46  to rupture the membrane  34  consistent with the discussion above. 
       FIGS. 22-26  disclose another embodiment of the dispenser of the present invention, generally designated with the reference numeral  210 . This dispenser is similar in structure and operation to the dispenser  10  of  FIGS. 1-22 . Differences will be discussed herein. The dispenser  210  has a container  212  having an outer wall  218  and a membrane  234 . These structures cooperate to define a sealed chamber  218  therein for containing a flowable material. The membrane  234  is a conical membrane extending from the outer wall  216  at an angle. The membrane  234  further has a plurality of weld seams  240  as discussed above. In an exemplary embodiment, the cone angle is 22.5 degrees, although as discussed, other angles are also possible. As shown in  FIGS. 22 and 24-25 , the membrane  234  is positioned at a proximal end  224  of the dispenser  210  rather than at an intermediate location along the outer wall  216 . Thus, the conical membrane  234  is fully exposed on its outer side to any outside environment. With this configuration, it is understood that the second chamber or dispensing chamber is eliminated. In operation, and as shown in  FIGS. 25-26 , force is applied proximate the conical membrane  234  at the end of the dispenser  210  wherein the membrane  234  ruptures along the weld seam  240 . This provides an opening in the membrane  234  wherein flowable materials contained therein can be dispensed from the dispenser. When the membrane ruptures, a distinct audible “pop” sound is produced. Overall, the dispenser  210  is formed and operates as described above. 
       FIGS. 27-28  disclose additional embodiments of the present invention. In these embodiments, a tandem container is utilized wherein a first container is contained within a second container to form a container assembly. As shown in  FIG. 27 , the first container is a dispenser such as shown in  FIGS. 22-26  described above and designated with the reference numeral  311 . The dispenser  311  is sealed with a first flowable substance M 1  and placed within a second container, such as the container of  FIGS. 1-22 , generally designated with the reference numeral  310 . The second container  310  holds a second flowable substance M 2 . The containers  310 , 311  each have a conical membrane  334  having the benefits described herein. Upon operation, it is understood from the discussion above that a user applies force to the second container  311  at the outer wall and proximate the conical membrane  334  of the first container  311  thus rupturing the rupturable membrane  334  of the first container  311 . The first flowable substance M 1  then passes by the membrane  334  and mixes with the second flowable material M 2  to form a mixture. The user then applies force to the second container  310  proximate its conical membrane  334  wherein the mixture can be dispensed from the container assembly.  FIG. 28  discloses a similar configuration but wherein the second container  310  has a generally straight membrane  334   a  such as shown in the &#39;319 patent. Operation of the container assembly is generally identical as that described regarding  FIG. 27 . It is understood that either of the first container  311  or the second container  310  can have a conical membrane. The containers  310 , 311  may also be sealed together at their distal ends or the first container  311  may be sealed separately and merely contained loosely within the chamber of the second container  310 . It is further understood that the designations “first” and “second” are used for illustrative purposes. 
     As shown in  FIG. 29 , in an alternative embodiment, a dispenser or container assembly is provided and designated with the reference numeral  410 . The dispenser has a dividing wall  419  that divides the chamber of the dispenser into multiple chambers, namely a first chamber  418  and a second chamber  420 . The first chamber  418  can be adapted to contain a first flowable material M 1  to be dispensed, and the second chamber  20  can be adapted to contain a second flowable material M 2  to be dispensed. A first angled membrane  434   a  can be provided such that it encloses the first chamber  418 , and a second angled membrane  434   b  can be provided such that it encloses the second chamber  420  to prevent the flow of materials M 1  and M 2  respectively. Both of the angled membranes  434   a ,  434   b  operate similar to the membrane  34  discussed above. The membranes  434   a , 434   b  extend at angles from the outer wall similar as described above and the angles associated with the first angle membrane  434   a  and the second angled membrane  434   b  can be the same. The first angle membrane  434   a  and the second angle membrane  434   b  can be considered a first membrane section and a second membrane section of an overall membrane structure. Each membrane  434   a ,  434   b  can be separately ruptured to control the flow of the individual flowable materials M 1 , M 2 . Additionally, in a further exemplary embodiment, a single angled membrane can be used to cover the first and second chambers  18 ,  20  similar to membrane  34  discussed above. In such an embodiment, the dividing wall  19  would extend from proximate a mid-portion of the membrane  34 . Upon rupture of the membranes, both M 1  and M 2  will flow from the first and second chambers  418 ,  420 . A third chamber  442  can be used as a mixing chamber for the first flowable material M 1  and the second flowable material M 2 . 
     The chamber dividing wall  419  is positioned in between the first chamber  418  and the second chamber  420  as shown in  FIG. 29 , and is a preferably planar member. The chamber dividing wall  419  has a sufficient thickness to divide and separate the chambers. The first and second chambers  418 ,  420  can vary in length as desired. The chamber dividing wall  419  divides the first chamber  418  and the second chamber  420 , and preferably joins to the membrane  34  at the membrane center point that defines a non-rupturable member  433 . Thus, the non-rupturable member  433  may be considered connected to the dividing wall  419 . While the dividing wall  419  extends substantially the entire longitudinal length of the container, it is understood that the dividing wall  419  can extend past the outer wall  416  of the container. This extended portion can be used by automation machinery used in the filling process of the dispenser  10 . The dividing wall  419  divides the container assembly  412  evenly along its longitudinal axis, making the first chamber  418  and the second chamber  420  generally of equal size. This position of the dividing wall  419  can vary to change the volumes of the chambers as desired. It is further contemplated that are other tandem container assemblies are possible. For example, separate components can each having an angled or conical membrane and define a chamber for holding a flowable substance. After filling the chambers, the components can be sealed together to form a container assembly capable of separately storing multiple components. The conical membranes can then be ruptured wherein the flowable substances can be mixed together to form a mixture and dispensed from the container assembly. 
     It is understood that the “first” and “second” designations for the dispenser of the present invention can be reversed as desired. It is further understood that the term “outer” when describing the outer wall of the dispenser is a relative term. It is understood that the dispenser of the present invention could be incorporated into other structures that may encompass the outer wall. The outer wall of the dispenser of the present invention, cooperates with the membrane and dividing wall in certain embodiments to define the chambers of the dispenser. 
     Forming the membrane  34  into an angled, conical or spherical shape provides certain advantages. Less force can be applied to the membrane  34  in order to rupture the weld seam  40  thereby making it easier for a user to break the weld seam  40  to dispense the flowable substance in the dispenser  10 . This can be useful in applications where users have difficulty providing a greater rupturing force via finger pressure. With less force required for rupture of the weld seam  40 , the weld seam  40  can also be molded having a thicker dimension t 2  if desired. With a thicker dimension, the typical force required for rupturing the membrane can be maintained if desired. With a thicker dimension, vapor passage of the flowable substance through the weld seam  40  is minimized. Weld seams  40  having minimal thicknesses are more susceptible to vapor passage therethrough, which affects the expected concentration of the flowable substance contained in the container  10 . This can also increase chances of contamination. As the membrane thickness increases, more materials are suitable for forming the membrane  34 , thereby increasing the flexibility of uses for the container  10  as the container  10  can be used with more flowable substances. The angled membrane  34  also provides for a distinct audible “pop,” as it is ruptured. This is desirable such that the user then has a definitive indication that the weld seam  40  has ruptured. 
     The inventors note that the angled membrane disclosed herein was arrived at after investigation and considerable testing and discovery. When considering membranes of other shapes, the inventors originally did not consider that an angled or conical membrane would properly function. It was expected that such a design would not rupture and instead, merely fold upon itself. To the contrary as explained herein, the angled or conical membrane provided unexpected results and enhanced benefits. 
     The rupturable membrane having a weld seam disclosed in U.S. Pat. No. 6,641,319 (“the &#39;319 patent) provides significant advancement over the prior art. This rupturable membrane disclosed in the &#39;319 patent is generally a planar membrane and positioned within the dispenser in a straight configuration wherein the membrane is generally transverse to the outer wall of the dispenser. This design provides a membrane that generally consistently ruptures upon the application of force (such as by fingers pressing at the membrane) proximate the membrane as discussed in the &#39;319 patent. Over time, it was discovered that in rare circumstances, certain users of the dispenser disclosed in the &#39;319 patent could not rupture the membrane. In such occurrences, the membrane would deflect but the weld seams tended to act similar to a living hinge and would not break. Upon further study of these rare occurrences, it was found that users were at times applying force too slowly than what most users applied with general finger pressure. When applying force more slowly, the molecular structures of the weld seam had time to realign such that rupture along the weld seam would not occur. Although these occurrences were rare, it prompted further study to determine if other membrane shapes could provide additional solutions or rupture with the application of more slowly-applied forces. Other membrane shapes were considered including an angled type membrane and, in particular, a conical membrane. 
     In the course of the studies relating to the rupturable membrane of the &#39;319 patent, it was already recognized that the weld seam, formed from segments of abutting plastic injection molded material, would rupture along the weld seam when subjected to force proximate the weld seam. Also in the course of these studies, it was discovered that the weld seam of the membrane was subjected to tensile stresses when rupturing. This provided greater understanding of the rupturable membrane of the &#39;319 patent. In view of this finding, when considering an angled or conical membrane, it was then considered that such a design may provide an enhanced state for rupturing. This was contrary to original considerations by the inventors herein that such a membrane would merely fold upon itself and not rupture. Further investigation and testing of an angled or conical membrane having a weld seam showed that the membrane did not fold upon itself but did indeed rupture along the weld seam. Upon further detailed testing, it was found that the conical membrane required less force to rupture the weld seam than the membrane having a weld seam of the &#39;319 patent. This provided additional options if a lesser rupture force was desired. This also allowed for thickening the weld seam and membrane to such that the weld seam in a conical membrane would rupture upon application of the same amount of force as typical with the membrane of the &#39;319 patent. As a result, molding of the membrane can be made easier and less costly because the membrane and weld seam are thicker wherein broader tolerances are possible resulting in less rejected parts. In addition, vapor passage through the thickened weld seam was decreased allowing for an increased number of flowable materials that could be contained by a dispenser having such a membrane. As an example, one exemplary embodiment of a membrane of the &#39;319 patent may have a weld seam thickness of approximately 0.0035 inches. A weld seam of such a membrane design will rupture at approximately 8 psi applied, for example, via finger pressure. This value was determined to be a typically desirable force that most users could apply to the membrane. With a conical membrane having a weld seam of approximately 0.0035 inches, detailed testing showed that the weld seam ruptured at approximately 5.5 psi. Thus, a lower rupture value was achieved. Further testing then showed that the weld seam thickness in a conical membrane could be increased to approximately 0.006 inches and would rupture at approximately 8 psi. Accordingly, the weld seam could be thickened. Such results also showed that a dispenser could be manufactured having a lesser force required for rupture, e.g. 5.5 psi for a weld seam thickness of 0.0035 inches, such as for users having an arthritic condition where it was more difficult to provide a suitable rupturing force. Such findings also showed that a dispenser having a conical membrane and weld seam could be made with additional blends of polyethylene and polypropylene as the weld seam would rupture and not be too stiff thus resisting rupture. In prior designs, if the membrane material was too stiff, the membrane was not suitably rupturable via the fingers of a user which was not practical. 
     Upon further study of the straight or planar membrane of the &#39;319 patent, it was discovered that when force is applied proximate the membrane, the force must first overcome the buckling resistance of the membrane sections adjacent the weld seam, as the membrane sections are generally aligned with the direction of the force applied. Once the force tends to buckle these sections, the weld seam is placed in tension and upon sufficient application of further force, the weld seam ruptures providing an opening in the membrane. Because of the shape of the angled or conical membrane of the present invention, the force applied proximate the membrane is not generally aligned with the membrane sections. Consequently, the force applied does not need to first overcome the buckle resistance of the membrane sections. The force is generally immediately directed on the weld seam wherein the weld seam is placed further in tension and ruptures. As a result, less force is required to rupture the angled or conical membrane than is required in the membrane of the &#39;319 patent. As discussed above, with less force required to rupture the membrane, the membrane and weld seam could be constructed in a thicker construction while still allowing rupture. With a thicker weld seam, less vapor passage occurs through the weld seam improving the performance of the dispenser container and allowing the container to contain a wider variety of materials such that concentrations of the flowable materials are better maintained. In addition, other materials could now be used to form the membrane and container. These materials included more chemically-resistant materials that further allowed an increase in the number of flowable materials that could be contained and dispensed from the container. Such an angled or conical membrane design further allows the dispenser to be made from other thermoplastic engineering materials and combinations thereof. Such materials include those that provide better chemical resistance and less vapor and oxygen transmission that could not be used in prior designs because such materials are too stiff to rupture the membrane with typical force provided by finger pressure. In one example, a blend of materials can now be used that includes a greater percentage of polypropylene. While such a blend provides more stiffness, the conical membrane will still rupture via finger pressure. The increase amount of polypropylene also provides a dispenser have greater chemical resistant properties. In another example, a dispenser having a conical membrane can be formed solely from nylon. 
     The dispenser of the present invention is designed to primarily contain and dispense flowable materials that are fluids. Other flowable materials can also be used. For example, the flowable material could be a liquid. Also, in other embodiments, the flowable materials M 1 , M 2  could both be fluids. In another embodiment, the first flowable material M 1  could be a liquid, and the second flowable material M 2  could be a powder to be mixed with the fluid. Other combinations depending on the use are also permissible. This permits the dispenser  10  to be used in a wide variety of uses, and contain and dispense a large variety of fluids and other flowable substances. The following is a non-exhaustive discussion regarding the many possible uses for the dispenser of the present invention. It is understood that related uses to those described below are also possible with the dispenser. 
     In one example, the dispenser of the present invention can be used in a two-part hair care product such as a hair dye kit. A first flowable substance of the hair dye kit can be carried in the first chamber, and a second flowable substance of the hair dye kit can be carried in the second chamber. The membrane is ruptured wherein the two flowable substances can be mixed together to form a mixture or solution. The mixture or solution can then be dispensed from the dispenser onto the hair of a user. In a multitude of other examples, the dispenser can dispense a flowable material or mixture that is an adhesive, epoxy, or sealant, such as an epoxy adhesive, craft glue, non-medical super glue and medical super glue, leak sealant, shoe glue, ceramic epoxy, fish tank sealant, formica repair glue, tire repair patch adhesive, nut/bolt locker, screw tightener/gap filler, super glue remover or goo-b-gone. Also, the dispenser can dispense a flowable material or mixture that is an automotive product, such as a rear view mirror repair kit, a vinyl repair kit, an auto paint touch up kit, a window replacement kit, a scent or air freshener, a windshield wiper blade cleaner, a lock de-icer, a lock lubricant, a liquid car wax, a rubbing compound, a paint scratch remover, a glass/mirror scratch remover, radiator stop-leak, or a penetrating oil. The dispenser can also dispense a flowable material or mixture that is a chemistry material, such as a laboratory chemical, a fish tank treatment, a plant food, a cat litter deodorant, a buffer solution, a rehydration solution of bacteria, a biological stain, a rooting hormone, a colorant dispenser, or disinfectants. 
     Moreover, the dispenser can dispense a flowable material or mixture that is a cosmetic, fragrance or toiletry, such as nail polish, lip gloss, body cream, body gel, hand sanitizer, cologne, perfume, nail polish remover, liquid soaps, skin moisturizers, tooth whiteners, hotel samples, mineral oils, toothpastes, or mouthwash. The dispenser can also dispense a flowable material or mixture that is an electronics product, such as a cleaning compound, a telephone receiver sanitizer, a keyboard cleaner, a cassette recorder cleaner, audio/video disc cleaner, a mouse cleaner, or a liquid electrical tape. In addition, the dispenser can dispense a flowable material or mixture that is a food product, such as food colorings, coffee flavorings, spices, food additives, drink additives, confections, cake gel, sprinkles, breath drops, condiments, sauces, liquors, alcohol mixes, energy drinks, or herbal teas and drinks. The dispenser  10  can also dispense a flowable material or mixture that is a hair care product, such as hair bleaches, hair streaking agent, hair highlighter, shampoos, hair colorants, conditioners, hair gels, mousse, hair removers, or eyebrow dye. The dispenser can also dispense a flowable material that is a home repair product, such as a caulking compounds or materials, a scratch touch up kit, a stain remover, a furniture repair product, a wood glue, a patch lock, screw anchor, wood tone putty or porcelain touch-up. 
     In addition, the dispenser can dispense a flowable material or mixture that is a test kit, such as a lead test kit, a drug kit, a radon test kit, a narcotic test kit, a swimming pool test kit (e.g., chlorine, pH, alkalinity etc.), a home water quality tester, a soil test kit, a gas leak detection fluid, or a pregnancy tester. The dispenser can dispense a large variety of lubricants including industrial lubricants, oils, greases, graphite lubricants or a dielectric grease. The dispenser can also dispense a flowable material or mixture that as part of a medical device test kit, such as a culture media, a drug monitoring system, a microbiological reagent, a streptococcus test kit, or a residual disinfectant tester. In addition, the dispenser  10  can dispense a large variety of medicinal products, such as blister medicines, cold sore treatments, insect sting and bit relief products, skin cleaning compounds, tissue markers, topical antimicrobials, topical demulcent, treatments for acne such as acne medications, umbilical area antiseptics, cough medicines, waterless hand sanitizers, toothache remedies, cold medicines and sublingual dosages. Furthermore, the dispenser can dispense a flowable material or mixture that is a novelty product, such as a chemiluminescent light, a Christmas tree scent, a glitter gel, and a face paint. The dispenser can also dispense a variety of paint products such as novelty paints, general paints, paint additives, wood stain samples, caulk, paint mask fluid or paint remover. The dispenser can also dispense a flowable material or mixture that is a personal care product, such as shaving cream or gel, aftershave lotion, skin conditioner, skin cream, skin moisturizer, petroleum jelly, insect repellant, personal lubricant, ear drops, eye drops, nose drops, corn medications, nail fungal medication, aging liquids, acne cream, contact lens cleaner, denture repair kit, finger nail repair kit, liquid soaps, sun screen, lip balm, tanning cream, self-tanning solutions or homeopathic preparations. A large variety of pest control products can be dispensed by the dispenser, including insect attractants, pesticides, pet medications, pet insect repellants, pet shampoos, pest sterilizers, insect repellants, lady bug attractant and fly trap attractant. Various safety products can be dispensed through the dispenser including respirator tests and eye wash solution. 
     The dispenser can also dispense a large variety of stationery or craft products, such as magic markers, glitter gels, glitter markers, glitter glues, gel markers, craft clues, fabric dyes, fabric paints, permanent markers, dry erase markers, dry eraser cleaner, glue sticks, rubber cement, typographic correction fluids, ink dispensers and refills, paint pens, counterfeit bill detection pen, envelope squeeze moisturizers, adhesive label removers, highlighters, and ink jet printer refills. The dispenser can also dispense various vitamins, minerals, supplements and pet vitamins. The dispenser can also dispense a flowable material or mixture in a variety of other applications such as for aroma therapy products, breathalyzer tests, wildlife lures, eyeglass cleaners, portable lighting fuels, bingo and other game markers, float and sinker devices, toilet dyes and treatments, dye markers, microbiological reagents, shoe polishes, clothing stain removers, carpet cleaners and spot removers, tent repair kits, plumbing flux applicator, rust remover, tree wound treatment, animal medicine dispenser, animal measured food dispenser, odor eliminator liquids, multi-purpose oils, ultrasonic cleaner concentrate, manufacturing parts assembly liquids and irrigation solutions. In addition, the dispenser can be used as, or in connection with a suction device for culture sampling, taking various liquid samples, taking various swabbing samples and for acting as a chemical tester, such as may be used for testing drinks for various “date rape” drugs. In addition, the dispenser can dispense a variety of sports products including sports eye black, football hand glue, and baseball glove conditioner and pine tar. The dispenser can dispense any variety of flowable materials including liquids and powders, and further including a liquid and a powder, two or more powders, or two or more liquids. The dispenser may be used as part of 2-part system (mix before use) including a liquid with a powder, a liquid with a liquid, a powder with a powder, or sealed inside another tube or product container or partially sealed, connected or attached to another container. The dispenser may also be used as part of a plunger dispensing system and diagnostic testing. 
     The dispenser of the present invention may also be used for windshield wiper blade cleaner and other automotive applications, fragrances, pastry gels, eyebrow dye, paints, hair paints, finger nail repair kit, animal medicine dispenser, animal food dispenser, culture media samples, drug test kits, and chemical testers (e.g. date rape etc.). As an illustration, although the applicator has been described as being utilized for mechanical uses, it can similarly be used for applying adhesives, mastic or the like. The dispenser may also be used in diagnostic testing kits, explosive testing kits or other test kits. 
     While the invention has been described in its preferred embodiments, it is to be understood that the words which have been used are words of description rather than limitation and that changes may be made within the purview of the appended claims without departing from the true scope and spirit of the invention in its broader aspects.