Patent Publication Number: US-10329076-B2

Title: Double-walled container

Description:
TECHNICAL FIELD 
     The present disclosure relates to a double-walled container including an outer layer body that constitutes an outer shell of the container and an inner layer body that is accommodated inside the outer layer body and that is deformable to undergo volume reduction. In the double-walled container, only the inner layer body undergoes volume reduction in response to dispensing of a content medium. 
     BACKGROUND 
     As an example of a container to contain cosmetics such as face lotion, shampoo, rinse, liquid soap, food seasoning, or the like, a double-walled container (which is also called delamination container) is known. Such double-walled container includes the outer layer body that constitutes the outer shell of the container and the inner layer body that is accommodated inside the outer layer body and that is deformable to undergo volume reduction. Furthermore, the outer layer body is provided with an ambient air introduction hole that communicates between the outer layer body and the inner layer body, and only the inner layer body undergoes volume reduction in response to dispensing of the content medium. 
     The content medium may be dispensed by various methods, such as using a pump fitted to a mouth of the outer layer body, mainly utilizing squeezing of a trunk of the outer layer body, and mainly utilizing the own weight of the content medium (refer, for example, to Patent Literature 1). In a container using the pump, the configuration is complicated, and moreover, cost increase is inevitable. In a container utilizing squeezing of the outer layer body, the configuration is relatively simplified. However, to cause only the inner layer body to undergo volume reduction, it is necessary to provide an ambient air introduction valve that is configured to close the ambient air introduction hole when the outer layer body is pressed and to open the ambient air introduction hole when the pressure is released. On the other hand, a container utilizing the own weight of the content medium has a simplified configuration and besides, it does not need the ambient air introduction valve. Accordingly, such a container is excellent in cost reduction. 
     In particular, when such a container utilizing the own weight of the content medium is formed by blow molding a parison, a pinched-off portion formed due to pinch-off using a splittable mold in the blow molding may be used directly as the ambient air introduction hole. The parison has been formed by laminating the outer layer body made of a synthetic resin and the inner layer body made of another synthetic resin having low compatibility with the outer layer body. That is to say, by splitting a bottom wall of the outer layer body at the pinched-off portion, the inner layer body is separated from the inner layer body. Thus, the slit-shaped ambient air introduction hole is provided in the pinched-off portion. 
     CITATION LIST 
     Patent Literature 
     PTL 1: JP 2008207860A 
     SUMMARY 
     Technical Problem 
     Meanwhile, the inner layer body of the double-walled container is furnished with various contrivances so that the entire inner layer body undergoes uniform volume reduction. Nevertheless, due to variation in thickness of the inner layer body itself, some portions thereof may collapse easily and preferentially. Consequently, as more of the content medium is dispensed, some portions of the inner surface of the inner layer body might contact each other, thereby leaving only a narrow passage for the content medium. Although, even in this case, a container using the pump or including the ambient air introduction valve may dispense the content medium until the container is empty, the complicated configuration and cost increase are inevitable as described above. On the other hand, in a blow molded double-walled container that uses the pinched-off portion as the ambient air introduction hole and that is configured to dispense the content medium mainly by its own weight, the following problem arises. That is to say, even when the outer layer body is squeezed, air that is present between the outer layer body and the inner layer body leaks from the ambient air introduction hole, and the inner layer body fails to undergo sufficient volume reduction. This makes it difficult to dispense the content medium. Accordingly, there has been a need for a novel double-walled container in which the above point is improved. 
     The present disclosure is to solve the above existing problem. The present disclosure is to propose a double-walled container that permits the content medium to be dispensed by its own weight and that also permits smooth dispensing by utilizing squeezing of the outer layer body by reducing the amount of air leaking from the ambient air introduction hole provided in the pinched-off portion when the outer layer body is squeezed 
     Solution to Problem 
     One of aspects of the present disclosure to solve the above problem resides in a double-walled container with a bottle shape including a mouth, a trunk, and a bottom. The double-walled container includes: an outer layer body that constitutes an outer shell of the double-walled container; an inner layer body that is accommodated inside the outer layer body and configured to be deformed to undergo volume reduction; and a straight slit that is provided in a pinched-off portion and that passes through the outer layer body, the pinched-off portion being formed in the bottom due to pinch-off using a splittable mold in blow molding. The bottom is provided, on an inner side in a radial direction of an outer edge portion thereof serving as a ground-contacting surface, with a substantially cross-shaped recess that is concave toward the mouth. The recess is configured by a first-direction recess portion that extends along an extending direction of the slit and a second-direction recess portion that intersects with the first-direction recess portion, and the slit is provided in a region in which the first-direction recess portion and the second-direction recess portion intersect with each other. 
     In a preferred embodiment of the double-walled container according to the present disclosure, the first-direction recess portion and the second-direction recess portion each have a substantially elliptical shape in a plan view thereof, and each of the first-direction recess portion and the second-direction recess portion has a depth from the outer edge portion serving as the ground-contacting surface that increases gradually from an outer side to an inner side in the radial direction and that is maximum in the region in which the first-direction recess portion and the second-direction recess portion intersect with each other. 
     In another preferred embodiment of the double-walled container according to the present disclosure, the bottom is provided, on outer sides of both end portions of the slit provided in the pinched-off portion, with a pair of reinforcing ribs that extends along an extension line of the slit. 
     In yet another preferred embodiment of the double-walled container according to the present disclosure, each of the pair of reinforcing ribs is formed with at least one bitten portion in which the reinforcing rib is bitten from one lateral surface toward another lateral surface thereof. 
     In yet another preferred embodiment of the double-walled container according to the present disclosure, the at least one bitten portion formed in each of the pair of reinforcing ribs comprises a pair of bitten portions configured to have opposite bite directions to each other. 
     Advantageous Effect 
     The present disclosure provides a double-walled container that permits the content medium to be dispensed by its own weight and that also permits smooth dispensing by utilizing squeezing of the outer layer body by reducing the amount of air leaking from the ambient air introduction hole provided in the pinched-off portion when the outer layer body is squeezed. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       In the accompanying drawings: 
         FIG. 1  is a front view, partially in a section, illustrating a double-walled container according to one of embodiments of the present disclosure; and 
         FIG. 2  is a bottom view illustrating a double-walled container of  FIG. 1 ; 
         FIG. 3A  is a sectional view illustrating A-A section in a double-walled container of  FIG. 1 , and  FIG. 3B  is a sectional view illustrating B-B section in a double-walled container of  FIG. 1 ; and 
         FIG. 4A  is a sectional view illustrating D-D section in a double-walled container of  FIG. 1 , and  FIG. 4B  is a partially enlarged sectional view illustrating a double-walled container as a reference. 
     
    
    
     DETAILED DESCRIPTION 
     The present disclosure will be described in more detail below by illustration with reference to the drawings.  FIG. 1  is a front view, partially in a section, illustrating a double-walled container according to one of embodiments of the present disclosure. 
     A double-walled container  1  includes an outer layer body  10 , which constitutes an outer shell of the container, and an inner layer body  20 , which is accommodated inside the outer layer body  10  and which is deformable to undergo volume reduction. Between the outer layer body  10  and the inner layer body  20 , there is provided an adhesive strip  30 , which bonds the outer layer body  10  and the inner layer body  20 . 
     The double-walled container  1  of the present embodiment has a laminated structure including the outer layer body  10 , which is made of a synthetic resin, the inner layer body  20 , which is made of another synthetic resin having low compatibility with the outer layer body  10 , and the adhesive strip  30 , which is a strip-shaped adhesive layer made of yet another synthetic resin having adhesion to the outer layer body  10  and the inner layer body  20 . The double-walled container  1  is obtained by blow-molding a parison which has been prepared by laminating these synthetic resins. In this regard, in the double-walled container  1  of the present embodiment, the outer layer body  10  has a double-layered structure with low-density polyethylene (LDPE) located on the outer side and polypropylene (PP) resin located on the inner side. The inner layer body  20  has a double-layered structure with ethylene vinyl alcohol copolymer (EVOH) resin located on the outer side and modified polyolefin resin (e.g., Admer®: Admer, manufactured by Mitsui Chemicals, Inc., is a registered trademark in Japan, other countries, or both) located on the inner side. The adhesive strip  30  is formed by modified polyolefin resin (e.g., Admer®). Additionally, although in the present embodiment the outer layer of the outer layer body  10  is formed by low-density polyethylene (LDPE) to impart squeeze properties, the outer layer of the outer layer body  10  may be formed by polypropylene (PP) resin, medium-density polyethylene (MDPE) resin, or high-density polyethylene (HDPE) resin. Furthermore, the polypropylene (PP) resin layer constituting the outer layer body  10  of the present embodiment is provided to improve separability of the inner layer body  20  and is not necessarily indispensable. Moreover, the above layered structures are merely illustrative. As long as the inner layer body  20  is separable from the outer layer body  10 , the materials of the outer layer body  10 , the inner layer body  20 , and the adhesive strip  30  are not particularly limited to any example. The outer layer body  10 , the inner layer body  20 , and the adhesive strip  30  may each have a single-layer or a multi-layer structure. 
     The outer layer body  10  is flexible and restorable. The outer layer body  10  includes a bottom wall  11 , which forms a bottom of the outer layer body  10 , a side wall  12 , which is coupled to an outer edge of the bottom wall  11  and which forms a trunk of the outer layer body  10 , and a mouth wall  13 , which is coupled to an upper portion of the side wall  12  and which has a cylindrical shape to form a mouth of the outer layer body  10 . The inner layer body  20  defines, inside thereof, filling space M, which may be filled with the content medium. The inner layer body  20  may be separated from the laminated outer layer body  10  and deformed to undergo volume reduction. 
     Additionally, the side wall  12  in the present embodiment has a tubular shape with a circular section and with a diameter decreasing toward the mouth wall  13 . However, the present disclosure is not limited to this embodiment, and the side wall  12  may have a shape with, for example, a polygonal or an elliptical section. The mouth wall  13  is provided with a screw portion  13   a , which is used to fit a cap body or the like. 
     As illustrated in  FIGS. 1 and 2 , the bottom wall  11  includes an annular-shaped outer edge portion  11   a , which serves as a ground-contacting surface, and a substantially cross-shaped recess  11   b , which is located on the inner side of the outer edge portion  11   a  and which is concave toward the mouth wall  13 . In a central region in the substantially cross-shaped recess  11   b , a slit  14  is formed as an ambient air introduction hole. The slit  14  passes through the outer layer body  10  and extends linearly. 
     As illustrated in  FIG. 2 , the substantially cross-shaped recess  11   b  is configured by a first-direction recess portion  17   a , which extends along the extending direction of the slit  14 , and a second-direction recess portion  17   b , which intersects with the first-direction recess portion  17   a . In the present embodiment, the first-direction recess portion  17   a  and the second-direction recess portion  17   b  each have a substantially elliptical shape in a plan view thereof and also has a center positioned on the center axis C of the double-walled container  1 . Furthermore, each of the first-direction recess portion  17   a  and the second-direction recess portion  17   b  has both end portions in the extending direction thereof (i.e., in a major-axis direction of the ellipse) that extend to the vicinity of the outer edge portion  11   a . In the present embodiment, the first-direction recess portion  17   a  and the second-direction recess portion  17   b  are disposed in a manner such that the extending directions of these recess portions  17   a  and  17   b  are orthogonal to each other. Moreover, the substantially cross-shaped recess  11   b  in the present embodiment has a symmetrical shape about a straight line L, which is an extension of the slit  14 . 
     A depth of each of the first-direction recess portion  17   a  and the second-direction recess portion  17   b  from the ground-contacting surface increases gradually from the outer side to the inner side in the radial direction and is maximum in the central region of the bottom wall  11  in which these recess portions  17   a  and  17   b  intersect with each other. 
     On the outer sides of both end portions  14   a  and  14   b  of the slit  14 , there is also provided a pair of reinforcing ribs  15   a  and  15   b , which extends along the extension line L of the slit  14 . Herein, the slit  14  and the pair of reinforcing ribs  15   a  and  15   b  are formed in the pinched-off portion formed due to pinch-off using the splittable mold in the blow molding. That is to say, the pair of reinforcing ribs  15   a  and  15   b  is formed by squashing the outer layer body  10  and the inner layer body  20  into flat in the state where the outer layer body  10  and the inner layer body  20  are sandwiched in the splittable mold. The slit  14  is formed as follows. That is to say, the central region of the bottom of the parison is pinched off by using the splittable mold at the time of the blow molding. Then, after the blow molding, the bottom wall  11  of the outer layer body  10  is split, and the inner layer  20  is separated from the outer layer body  10 . As a method of forming the slit  14  after the blow molding, the pair of reinforcing ribs  15   a  and  15   b  may be pressed toward the mouth wall  13 . This method facilitates the split of the bottom wall  11  of the outer layer body  10  and the separation of the inner layer body  20  from the outer layer body  10 , thus allowing the formation of the slit  14 . At this time, since the reinforcing ribs  15   a  and  15   b  have higher rigidity than the portion corresponding to the slit  14 , a crack in the portion of the outer layer body  10  that is to form the slit  14  does not progress beyond both the end portions  14   a  and  14   b  of the slit  14  as the bases of the reinforcing ribs  15   a  and  15   b . Thus, the slit  14  of a desired length is formed. 
     Each of the reinforcing ribs  15   a  and  15   b  is formed with a pair of bitten portions  16   a  and  16   b , in which the reinforcing rib is bitten from one lateral surface toward the other lateral surface thereof. Herein,  FIGS. 3A and 3B  are partially enlarged sectional views respectively illustrating A-A section and B-B section in the double-walled container  1  of  FIG. 1 . As illustrated, the bitten portion  16   a , which is positioned on the inner side in the radial direction, and the bitten portion  16   b , which is positioned on the outer side in the radial direction, have opposite bite directions to each other. In the present embodiment, the bitten portions  16   a  and  16   b  are provided in the pair of reinforcing ribs  15   a  and  15   b  in the configurations in which the bitten portions  16   a  and  16   b  are rotated 180 degrees about the center axis C of the double-walled container  1 . Additionally, in the present embodiment, the reinforcing ribs  15   a  and  15   b  are not indispensable components. The configurations, the number, the positions, or the like of the reinforcing ribs  15   a  and  15   b , and the configurations, the number, the positions, the bite directions, or the like of the bitten portions  16   a  and  16   b  are not particularly limited to any example. 
     In the present embodiment, only the single adhesive strip  30  is provided in the side wall  12 . The adhesive strip  30  extends from the vicinity of one reinforcing rib  15   b  to the mouth wall  13  along the direction of the center axis C of the container  1 . Additionally, an end portion of the adhesive strip  30  may be overlapped with the reinforcing rib  15   b  or may terminate before the reinforcing rib  15   b . In the present embodiment, the adhesive strip  30  extends along the extension line L of the slit  14  and also along the parting line formed in the side wall  12  by the splittable mold. The end portion of the adhesive strip  30  that is located on the side of the bottom wall  11  is overlapped with an outer end portion of the reinforcing rib  15   b . The length, the width, and the number of the adhesive strip  30  are not limited to any example and may be changed as appropriate. Furthermore, the adhesive strip  30  does not necessarily extend linearly and may have a bent or a curved portion. Additionally, in the present disclosure, the adhesive strip  30  is not an indispensable component. The adhesive strip  30  may be provided in only one or both of the pair of reinforcing ribs  15   a  and  15   b.    
     Since the adhesive strip  30  is disposed in the vicinity of the one reinforcing rib  15   b , the reinforcing rib  15   b  has strong adhesion. Accordingly, occurrence of a crack is further prevented in the reinforcing rib  15   b , and even when being split, the reinforcing rib  15   b  is unlikely to be opened in response to squeezing. Additionally, the pair of bitten portions  16   a  and  16   b  is formed as follows. That is to say, pins corresponding to the bitten portions  16   a  and  16   b  are provided on surfaces of the splittable mold used in the blow molding that are to form the lateral surfaces of the reinforcing rib  15   a  and  15   b . Then, the pins are bitten into the lateral surfaces of the reinforcing rib  15   a  and  15   b.    
     To the mouth of the double-walled container  1  of the present embodiment, a dispensing cap  40  is fitted by screw engagement. The dispensing cap  40  is held in engagement with the mouth wall  13 . The dispensing cap  40  includes a dispensing plug  41  and a cap body  43 , which is coupled to the dispensing plug  41  via a hinge  42  for opening and closing of the dispensing plug  41 . Additionally, the hinge  42  may also be omitted. In this case, the cap body  43  may be formed as a separate body that is adapted for screw engagement or undercut engagement with the dispensing plug  41 . 
     The dispensing plug  41  includes a fitting tube  44 , which is adapted for undercut engagement with an outer circumferential surface of the mouth wall  13 , a partition wall  45 , which covers an upper portion of the fitting tube  44 , and a dispensing tube  46 , which extends vertically upward from the partition wall  45  and which has an inside communicating with the filling space M. The dispensing plug  41  also includes a cylindrical wall  47 , which is connected to the lower side of the dispensing tube  46 . The cylindrical wall  47  is provided, on an inner circumferential surface thereof, with a plurality of longitudinal ribs  48 , which is provided at an interval in the circumferential direction. On the inner side of the longitudinal ribs  48  in the radial direction, a spherical body  49  is disposed. The spherical body  49  is held by bulges provided in upper ends of the longitudinal ribs  48  in a manner such that the spherical body  49  is prevented from slipping out. The cylindrical wall  47  is provided, in a lower portion thereof, with an inclined wall  47   a , whose diameter decreases downward. Herein, the spherical body  49  is displaceable by its own weight along the longitudinal ribs  48 . As illustrated in  FIG. 1 , when the double-walled container  1  is in an upright position, the spherical body  49  is in abutment against the inclined wall  47   a  over the entire circumference to seal the filling space M of the inner layer body  20 . 
     The cap body  43  includes a top wall  50 , which covers an upper side of the dispensing plug  41 , and a circumferential wall  51 , which is coupled to an outer edge portion of the top wall  50 . The circumferential wall  51  is also coupled to the fitting tube  44  via the hinge  42 . The top wall  50  is provided, in a lower surface thereof, with a sealing tube  52 , which is configured to abut against the dispensing tube  46  in a liquid-tight manner. The top wall  50  is also provided, in a portion thereof that is located on the inner side of the sealing tube  52  in the radial direction, with a pin  53 , which extends downward. The pin  53  is designed to abut against the spherical body  49  before the spherical body  49 , when being displaced upward, reaches the upper limit. This prevents the spherical body  49  from being displaced over the bulges provided in the upper ends of the longitudinal ribs  48  and disengaged, even when the spherical body  49  is displaced upward forcibly due to transportation or the like. 
     To dispense the content medium from the double-walled container  1  fitted with the dispensing cap  40 , the cap body  43  needs to be opened, and the double-walled container  1  needs to be brought into a tilted or an inverted position. By doing so, the spherical body  49  is displaced toward the dispensing tube  46 . Accordingly, due to its own weight, the content medium in the filling space M passes from an opening defined by the inclined wall  47   a  through between adjacent longitudinal ribs  48  to be dispensed from the dispensing tube  46 . At this time, ambient air is introduced between the outer layer body  10  and the inner layer body  20  through the slit  14 . Accordingly, only the inner layer body  20  undergoes volume reduction while the outer layer body  10  maintains its shape. 
     As dispensing of the content medium progresses and the remaining amount of the content medium starts to decrease, due to the decreasing weight of the overall content medium, it becomes difficult to dispense the content medium simply by tilting the double-walled container  1 . Because of this, the outer layer body  10  is to be pressed (squeezed) by holding the side wall  12  from both sides. 
     As described above, the slit  14  serves to introduce ambient air between the outer layer body  10  and the inner layer body  20 . However, when the content medium is dispensed by utilizing squeezing, the amount of air leaking from the slit  14  is preferably minimized so that the inner layer body  20  may be pressed sufficiently. 
     Herein,  FIG. 4A  is a sectional view illustrating D-D section in the double-walled container of  FIG. 1 .  FIG. 4A  is a side sectional view cut by a plane passing through the center axis C along the extending direction of the second-direction recess portion  17   b .  FIG. 4B  is a sectional view illustrating a double-walled container, as a reference, in which the second-direction recess portion  17   b  is not provided. In the double-walled container  1  of the present embodiment, since the substantially cross-shaped recess  11   b  is provided in the bottom, the height of the bottom wall  11  from the ground-contacting surface, especially, the height of the bottom wall  11  at both sides of the slit  14 , is increased widely. As illustrated in  FIG. 4B , without the substantially cross-shaped recess  11   b , especially, without the second-direction recess portion  17   b , being provided in the bottom, pressure of the content medium applied to the bottom of the inner layer body  20  tends to escape to the outer side in the radial direction as indicated by an arrow. Consequently, the inner layer body  20  is displaced upward and separated from the outer layer body  10  in the central region provided with the slit  14 . However, in the present embodiment, as illustrated in  FIG. 4A , since the height of the bottom wall  11  at both the ends of the slit  14  is increased widely, pressure of the content medium applied to the bottom of the inner layer body  20  in response to squeezing hardly escapes to the outer side in the radial direction. Consequently, the inner layer body  20 , which remains adjacent to the outer layer body  10 , serves to block the slit  14  in the central region provided with the slit  14 . This reduces the amount of air leaking through the slit  14  from space between the outer layer body  10  and the inner layer body  20  in response to squeezing, and the inner layer body  20  is pressed sufficiently. Accordingly, the content medium, even when it is difficult to be dispensed by its own weight, may be dispensed until the double-walled container  1  is empty. Additionally, once the pressure is released, the outer layer body  10  is restored by its rigidity, and sufficient ambient air is introduced between the outer layer body  10  and the inner layer body  20  through the slit  14 . Thus, the double-walled container  1  according to the present disclosure permits the content medium to be dispensed by its own weight and also permits, when the remaining amount of the content medium is decreased, the content medium to be dispensed smoothly in response to squeezing of the outer layer body  10 . Furthermore, the double-walled container  1  avoids cost increase by omitting the need of the ambient air introduction valve. Additionally, with the double-walled container  1  of the present embodiment, the content medium may be dispensed in response to squeezing of the outer layer body  10  from the beginning depending on applications. 
     Moreover, in the present embodiment, the reinforcing ribs  15   a  and  15   b  are provided on both the sides of the slit  14 . Accordingly, both the end portions  14   a  and  14   b  of the slit  14  are reinforced, and progress of a crack from both the end portions  14   a  and  14   b  of the slit  14  is prevented during molding and even during repeated use. This permits formation of the slit  14 , as the ambient air introduction hole, of a predetermined length. The result is that the amount of air leaking in response to squeezing is reduced while still fully achieving the effect of the ambient air introduction hole to introduce ambient air. 
     Moreover, in the double-walled container  1  of the present embodiment, the bitten portions  16   a  and  16   b  are provided in each of the reinforcing ribs  15   a  and  15   b . Accordingly, areas of compressed surfaces of the reinforcing ribs  15   a  and  15   b  are increased, and, by taking advantage of the friction, bottom crack resistance of the reinforcing ribs  15   a  and  15   b  is improved. This further ensures that progress of a crack from the slit  14  to the reinforcing ribs  15   a  and  15   b  may be prevented. Additionally, in each of the reinforcing ribs  15   a  and  15   b , the bitten portion  16   a , which is positioned on the inner side in the radial direction, and the bitten portion  16   b , which is positioned on the outer side in the radial direction, are preferably configured to have opposite bite directions to each other. This further improves bottom crack resistance of the compressed surfaces in the reinforcing ribs  15   a  and  15   b.    
     In the double-walled container  1  of the present embodiment, the adhesive strip  30  is provided in the vicinity of the one reinforcing rib  15   b . Accordingly, the reinforcing rib  15   b , near which the adhesive strip  30  is provided, has strong adhesion. This prevents occurrence and progress of a crack and enhances the effect of forming the slit  14  of a desired length. 
     Although the present disclosure has been described based on the illustrated examples, the present disclosure is not limited to the above embodiment and may be changed as appropriate within the scope of the claims. For example, the mouth wall  13  may be provided with an engagement projection to be plugged. In this case, the mouth wall  13  may be plugged, instead of screw-engaged, with the dispensing cap, which comes into undercut engagement. 
     REFERENCE SIGNS LIST 
     
         
         
           
               1  Double-walled container 
               10  Outer layer body 
               11  Bottom wall 
               11   a  Outer edge portion (ground-contacting surface) 
               11   b  Substantially cross-shaped recess 
               12  Side wall 
               13  Mouth wall 
               14  Slit 
               14   a ,  14   b  End portion of slit 
               15   a ,  15   b  Reinforcing rib 
               16   a ,  16   b  Bitten portion 
               17   a  First-direction recess portion 
               17   b  Second-direction recess portion 
               20  Inner layer body 
               30  Adhesive strip 
               40  Dispensing cap 
               41  Dispensing plug 
               42  Hinge 
               43  Cap body 
               44  Fitting tube 
               45  Partition wall 
               46  Dispensing tube 
               47  Cylindrical wall 
               47   a  Inclined wall 
               48  Longitudinal rib 
               49  Spherical body 
               50  Top wall 
               51  Circumferential wall 
               52  Sealing tube 
               53  Pin 
             C Center axis of container 
             L Extension line of slit 
             M Filling space