Abstract:
This invention provides an apparatus and a method for making package which has less rejection rate during manufacturing. The method in the present invention also produces packages with good dimensional accuracy. The apparatus in the present invention is provided for making three side gusset package with improved method of feeding side gusset tube and feeding bottom gusset along with web registration of bottom and side gusset to have printing perfectly located and aligned on package surfaces such that the images or graphics can be printed partially on front side &amp; back side, continuing over side and bottom gusset surfaces.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application is a continuation of PCT Application No. PCT/IN2008/000436, filed Jul. 8, 2008, which claims priority to and the benefit of Indian Application No. 1448/DEL/2007, filed Jul. 9, 2007, each of which is incorporated herein by reference in its entirety. 
     
    
     FIELD OF INVENTION 
       [0002]    This invention relates to an apparatus for making packages, a method for making packages and a package manufactured by said apparatus and method. 
       BACKGROUND OF THE INVENTION 
       [0003]    Packages with three side gusset are available on the market today for packing liquids and solids and different manufacturing methods are used for the same. These kinds of bags with three side gussets are known in the numerous embodiments, which depend on the use, to which they are to be put. One type of plastic bag forming machine and method of operation is disclosed in U.S. Pat. No. 4,929,224 to Hanson et al., which uses closed sleeve plastic material with inwardly gusseted sides as a raw starting material. Another method of making flat-bottomed plastic bags is disclosed in U.S. Pat. No. 5,102,384. 
         [0004]    U.S. Pat. No. 6,056,681 provides a method and apparatus for forming flat-bottomed plastic bags which gives more consistent and precise results than are obtainable using pre-gusseted tubing. 
         [0005]    The plastic bag is advantageous in that the first and second side gusset portions can be unfolded between the first and second side edges respectively to obtain a large capacity. The bottom gusset portion and the first and second auxiliary gusset portions can also be unfolded between the bottom edges to constitute a rectangular bottom. The plastic bag can therefore stably stand on a table. However, it has been heretofore difficult to successively make the plastic bags. Further, there are several method of manufacturing the packages with three side gussets are also disclosed in various patent applications and patents. 
         [0006]    U.S. Pat. No. 6,561,963 and EP 1106339 disclose a new and improved apparatus for successively making plastic bags where every bag is completed with first and second side gusset portions and then a bottom gusset portion. U.S. patent application Ser. No. 10/052,267 which is continuation application with respect to said U.S. Pat. No. 6,561,963 and matured as U.S. Pat. No. 6,692,148 provides plastic bag making apparatus. 
         [0007]    U.S. Pat. No. 6,425,847 provides a method for producing a packing material from plastic film or a similar weldable material in the form of a bag or sack with side folds of the initially given type. 
         [0008]    In our co-pending application number 582/MUM/2004, we have described a reclosable flexible package with a slider zipper assembly and three-side gusset having a handle and a method of manufacturing the same. 
         [0009]    However the methods used in the above-mentioned documents are very complicated. Further, the methods used in the above-mentioned patent applications/patents increase the rejection rate in the manufacturing of package. Additionally, packages produced by the methods and apparatus disclosed in the documents may not have good dimensional accuracy. 
       OBJECTS AND SUMMARY OF THE INVENTION 
       [0010]    To overcome the aforementioned drawbacks, this invention provides for an apparatus for making packages, a method for making packages and a package thereof. 
         [0011]    It is an object of the invention to provide an apparatus and a method for making packages which are simple. 
         [0012]    It is another object of the invention to provide an apparatus and a method for making package which has less rejection rate. 
         [0013]    It is yet another object of the present invention to provide an apparatus and a method for making package with good dimensional accuracy. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0014]    The accompanying drawings illustrate the preferred embodiments of the invention and together with the following detailed description, serve to explain the principles of the invention. 
           [0015]      FIG. 1  shows an apparatus for making a package according to the present invention. 
           [0016]      FIG. 2  depicts material flow and forming of side gussets. 
           [0017]      FIG. 3  shows cutting of the side gusset over bottom sheet. 
           [0018]      FIG. 4  shows sealing of side gusset. 
           [0019]      FIG. 5  shows the sealing of top and bottom sheet with side gusset. 
           [0020]      FIG. 6  represents sealing of the bottom gusset with side gusset. 
           [0021]      FIG. 7  represents sealing of the registered bottom gusset along with top and bottom sheet. 
           [0022]      FIG. 8  represents the folding of the bottom gusset. 
           [0023]      FIG. 9  represents the flow indication of the packages and cutting the package. 
           [0024]      FIG. 10  shows cutting of the final package. 
           [0025]      FIG. 11  depicts a three side gusset package manufactured by the above-mentioned apparatus and method. 
       
    
    
       [0026]    The apparatus for making three side gusset package with improved method of feeding side gusset tube and feeding bottom gusset along with web registration of bottom and side gusset to have printing perfectly located and aligned on package. With help of this method, we can have image or graphics printed partially on front &amp; back portion along with side and bottom gusset. 
       DETAILED DESCRIPTION 
       [0027]    It will be understood by those skilled in the art that the foregoing general description and the following detailed description are exemplary and explanatory of the invention and are not intended to be restrictive thereof. 
         [0028]      FIG. 1  shows an apparatus for making a package according to the present invention. 
         [0029]    A horizontal package making machine with improved method of inserting side and bottom gusset where a roll of film/laminate is loaded vertically on main unwind ( 3 ) of machine with reel loading ( 2 ). The said film/laminate passes through unwind pulling ( 4 ) and pulled forward with the help of horizontal dancer ( 5 ) with AC variable drive. The film/laminate is cut into two equal parts. One layer moves on top &amp; one at bottom. For proper registration of machine mark, servo motor is provided at ( 6 ) which pulls the bottom film with perfect registration. 
         [0030]    A tube of film/laminate is formed at side gusset forming unit ( 8 ). Said tube is fed on bottom sheet in such a manner that the tube joint remains at the bottom web. The tube is then sealed with bottom web with the help of side gusset tagging attachment ( 9 ). The said tube is sealed with top web with the help of sealer ( 10 ). Top web joins the bottom web after sealing at station ( 10 ). The top and bottom webs are pulled apart using rollers to form rhombus shape at station  14 . 
         [0031]    The film/laminate is folded flat over the side of the top and bottom gusset with the help of bottom folding, creasing &amp; tagging unit ( 14 ) for making the bottom gusset. 
         [0032]    The bottom gusset feeding starts from unwinding station at ( 13 ). The film/laminate moves continuously from side and joins with top &amp; bottom webs and side gussets. 
         [0033]    The said top &amp; bottom webs with side and bottom gussets passes through bottom center folding former ( 15 ) to flatten the bottom gusset horizontally. The top web is pulled to sealing and cooling station with the help of draw roller ( 16 ). The said top &amp; bottom webs along with bottom gusset then move to station ( 17 ) for bottom sealing and subsequent cooling unit ( 18 ). The said three side gusset film/laminate then moves towards slider &amp; Zipper loading station  19 ) with or without diaphragm (in case of one up package. The film/laminate moves forward through draw roller ( 20 ) for bottom sealing/fusing and cooling station ( 21 ). The said three side gusset film/laminate then moves to station ( 22 ) for cross sealing and cross cooling ( 23 ). The said three side gusset film/laminate then moves to side trimming unit ( 25 ) for trimming of excess sealed area on top &amp; bottom webs. The said 3-side gusset film/laminate proceeds towards station ( 27 ) for bottom round corner punching, if desired. Center slitting ( 28 ) is required for 2-up package line to slit and to separate formed &amp; sealed webs into two halves to form two packages. A servo puller is attached at station ( 29 ) for pulling the film/laminate. Finally a combination of two special type of fly blades operation is attached at station ( 30 ) which moves to &amp; fro for strip cutting in the sealed area and finally makes one three side gusseted package in case of one up machine and two numbers of three side gusseted packages in case of two up machine. 
         [0034]    As shown in the figure, unwinding of film/laminate starts from station ( 3 ), ( 7 ) and ( 13 ). The final stage of receiving the finished packages at the extreme end of the machine on working table ( 31 ). 
         [0035]      FIG. 2  depicts material flow and forming of film/laminate tube for side gussets. It explains the flow of film/laminate (A 6 ) for the formation of tube for side gussets (A 4 ), after unwinding. The bottom film/laminate web (D 2 ) flows horizontally to the machine and tube of film/laminate for side gussets flows in a perpendicular direction to the bottom web as shown. For preparing the side gussets, first the film/laminate is formed in a tube shape with open ends folded towards bottom as shown with dotted line in the drawing and passes to a set of rollers for creasing the end of the tube (A 5 ). A servo puller (A 3 ) is attached for pulling the tube and feeding it over the bottom film/laminate web (D 2 ). The tube for side gussets is cut as shown in (A 2 ) when it tagged/sealed over the bottom web (D 2 ). 
         [0036]      FIG. 3  shows cutting of the tube for side gussets over bottom web. It explains cutting position (B 1 ) on the tube for side gussets (B 2 ) when it comes over the bottom film/laminate web (D 2 ). 
         [0037]      FIG. 4  shows sealing of tube for side gussets. It shows tagging/sealing of tube for side gusset at (C 3 ) over bottom film/laminate web (D 2 ). The process fixes the position of tube for side gussets (A 4 ) over the bottom film/laminate web, as shown in  FIG. 1  at ( 9 ). 
         [0038]      FIG. 5  shows the sealing of top and bottom film/laminate web with tube for side gussets (A 4 ). It shows the flow &amp; sealing of top film/laminate web (D 1 ) &amp; bottom film/laminate web (D 2 ) with tube for side gussets (A 4 ). This stage is as shown in  FIG. 1  at station ( 10 ). 
         [0039]      FIG. 6  represents sealing of the bottom gusset along with tube for side gussets. This shows the flow of top and bottom film/laminate web sealed with tube for side gussets (E 1 ) and formation of the tube for side gussets to a rhombus shape through set of rollers (E 2 ) &amp; (E 3 ). The said film/laminate then moves through creasing plate (E 5 ) for flattening the surface of rhombus made on tube for side gussets. After creasing of tube for side gussets, the bottom gusset film/laminate (E 7 ) is inserted over flattened rhombus on the tube for side gussets. Now bottom gusset and tube for side gussets pass through stage (E 6 ) for sealing. 
         [0040]      FIG. 7  represents sealing of the registered bottom gusset along with top and bottom webs. 
         [0041]    It explains the film/laminate for bottom gusset unwinding layout (F 1 ). The film/laminate is pulled by a precise pulling means (F 2 ). Said precise pulling means can be servo puller. Bottom gusset servo puller (F 2 ) is used for pulling the. The film/laminate for bottom gusset (F 8 ) moves forward for bottom gusset tagging at (F 5 ) before entering into bottom gusset center folder (F 3 ). Forming roller (F 6 ) is to press the film/laminate (F 9 ). Folding is done through creasing plate (F 7 ). The bottom gusset photocell (F 4 ) is used for proper alignment of the bottom gusset. 
         [0042]      FIG. 8  represents the folding of the bottom gusset. This drawing explains the bottom fold (G 3 ) in bottom gusset formed when it moves along with top &amp; bottom webs sealed with tubes for side gussets (E 1 ) through bottom gusset center folder (G 2 ). 
         [0043]      FIG. 9  represents the flow indication of the packages and cutting the packages. It explains the position of bottom round corner (H 2 ) shaped through a punching device, position of center slitting (H 1 ) for two up package and finally cutting the package by a set of two blades for strip (H 3 ) cutting to separate the packages from continuous line. 
         [0044]      FIG. 10  shows cutting of the final packages. It explains the cutting attachment for separation the final package (J 3 ) through a double blade cutting attachment (J 1 ) actuated through a pneumatic or hydraulic or mechanical or any other suitable means (J 2 ). Special type of fly Knife (blade) mechanism is used to cut the packages. 
         [0045]      FIG. 11  depicts a three side gusset package manufactured by the above-mentioned apparatus and method. It shows the finished final package with three gussets (K 2 ), (K 3 ) (K 4 ) and front side (K 5 ), back side (K 6 ). Other side of the package is attached with zipper slider/press to lock zipper (K 1 ), with or without diaphragm for re closing and opening the mouth for filling or taking out the product. 
         [0046]    Through out the patent specification, a convention employed is that in the appended drawings, like numerals denote like components. 
         [0047]    It will be readily appreciated by those skilled in the art that the present invention is not limited to the specific embodiments herein shown. Thus variations may be made within the scope without sacrificing the principal advantages of the invention. For example, said three side gusset film/laminate then moves towards station ( 19 ) for making packages with zipper slider/press to lock zipper with or without diaphragm to make the package re-closable in case of one up package. 
         [0048]    In another aspect of the invention a diaphragm of film or laminate with or without metalized film, is placed below the zipper assembly to close the mouth of the package and act as barrier, making it tamper proof. A perforations or laser scoring line on said diaphragm can be provided for making it easier and more convenient for the user to tear open and access the contents of the package. 
         [0049]    In another embodiment of the invention a handle is provides for easy carrying and handling of the filled package. A pre-cut handles are inserted on top and bottom webs opposite to the bottom gusset. 
         [0050]    In yet another embodiment of the invention a slider zipper assembly/press to lock zipper, a diaphragm, a scoring on said diaphragm and a handle is attached to the package.