JP6413336B2 - Shrink package and manufacturing method thereof - Google Patents

Description

  The present invention relates to a package in which a package group such as a plurality of containers is shrink-wrapped and a method for manufacturing the same.

  Conventionally, aerosol cans (hereinafter abbreviated as “empty cans”) are transported from a can-making factory to a filling factory by using a plurality of paper carton return boxes (boxes for delivering goods to suppliers: (It is abbreviated as a paper carton.) In the filling factory at the transport destination, empty cans are manually taken out from the paper carton, the taken out empty cans are arranged on the conveyor of the filling line, and the arranged empty cans are moved by the conveyor to be filled with the contents.

  The used paper carton with the empty cans taken out is folded and returned to the can-making factory. In the can manufacturing factory, the returned paper carton was inspected to remove the defective carton, and after being treated for sterilization as necessary, it was used again.

  However, although the paper carton can be unpacked according to the speed of the filling line, the paper carton paper dust sometimes enters the empty can during unpacking. In this case, the nozzle may be clogged at the time of injection after filling, which may cause a problem in aerosol injection. In addition, there are problems such as man-hours for managing paper cartons (sorting defective products, etc.).

  Therefore, a shrink wrapping body in which a plurality of containers are integrally shrink-wrapped instead of a paper carton as in Patent Document 1 has been proposed. If an outline is demonstrated based on FIG. 7, the perforation 5 for cutting is formed in the shrink film 1 of the patent document 1 along the row | line | column of the container 2 in the shrink film 4. FIG.

  By breaking the perforation 5 and cutting off the shrink film 4, only the portion from which the container 2 is taken out can be opened, and the portion other than the taken out portion is maintained in the shrink wrapping state to prevent the container 2 group from spreading. .

JP 2004-18011 A

  However, in the shrink package 1 of Patent Document 1, since the perforations 5 are formed along the rows of the containers 2, the containers 2 can be taken out for each row, but all the containers 2 are taken out at a time. It is not possible. Therefore, the efficiency of the canning operation is poor and there is a possibility that it is not suitable for supplying empty cans to a high-speed filling line.

  The present invention has been made to solve such problems, and an object of the present invention is to provide a shrink package that can be manually and efficiently taken out in a short time and a method for manufacturing the same.

  The shrink wrapping body of the present invention is a shrink wrapping body in which a group of objects to be packaged is wrapped with a shrink film, the first easy opening line provided on each of the opposing side surfaces of the shrink film, and the upper and lower sides of the shrink film. And a second easy opening line connecting the first easy opening lines via any one of the surface portions.

In the shrink package of the present invention,
(1) The packaged body group includes a plurality of packaged bodies arranged in a staggered manner;
(2) The shrink film is formed by sealing seals corresponding to each other to seal the periphery of the package group in two base films, and the seal part is disposed on the side part, Not overlap with the second easy opening line,
(3) The first easy opening line is located between the seal portion and the second easy opening line,
(4) The first easy opening line and the second easy opening line are configured by perforations in which vertically long holes are arranged at equal intervals,
Is preferred.

  The manufacturing method of the shrink wrapping body of the present invention is the manufacturing method of the shrink wrapping body according to any one of the above, and the seal corresponding part of one shrink film in which an H-shaped easy-open line is formed, and the other A sealing step of sealing a portion corresponding to the seal of the shrink film to cover the package, and a heating step of heating and shrinking the shrink films after the sealing step, and an H-shape after the heating step. The shape of the easy opening line constitutes the first easy opening line and the second easy opening line.

  ADVANTAGE OF THE INVENTION According to this invention, the shrink package body which can be taken out efficiently by a manual work in a short time, and its manufacturing method are provided.

(A) is a top view of the shrink package according to the embodiment of the present invention, (b) is a side view on the long side P side of (a), and (c) is a partial side view on the short side Q side of (a). . The perspective view of the state which broke the 1st easy opening line and the 2nd easy opening line of the shrink package, and opened both. Detailed drawing of the 1st easy opening line and the 2nd easy opening line. (A) is a top view of a pair of base film, (b) is a schematic diagram of a heat seal process, (c) is a schematic diagram of a heat shrink process. The side view of the empty can of an aerosol can. (A) is a perspective view of a state in which the shrink wrapping body is placed horizontally on the work table, (b) is a perspective view of a state in which the second easy-open line of the shrink wrapping body is torn, and (c) follows the state of (b). The perspective view of the state which teared the 1st easy-open line, (d) The perspective view of the state which tries to fall down a shrink wrapping body forward, (e) is the perspective view of the state after falling down a shrink wrapping body ahead (F) is a perspective view of a state in which the shrink package is pushed forward, (g) is a perspective view of a state in which the shrink film is to be removed from the shrink package on the conveyor of the filling line, and (h) is the shrink The perspective view of the state which has removed the film, (i) is a perspective view after removal of the shrink film. The perspective view of the shrink package body of patent document 1. FIG.

  Hereinafter, the shrink package according to the embodiment of the present invention will be described. This shrink package is used as a package for transporting a group of packages such as a plurality of containers, and an empty container is preferable as a packaged container.

  As a container to be packed, for example, a metal can (aerosol can, general food can, welded can, deep-drawn can, squeezed can, seamless can, squeezed iron can, stretch draw can, etc.), plastic bottle, cup, and the like are preferable. Here, as an example, a shrink package for packing empty cans of aerosol cans (hereinafter abbreviated as empty cans as in the background art) will be described.

≪Example of shrink package structure≫
A configuration example of the shrink package will be described with reference to FIGS. As shown in FIGS. 1A and 1B, the shrink package 10 is a package in which empty cans 11 are packaged with a synthetic resin shrink film 12. The upper and lower surfaces are square cubes or upper and lower surfaces. Has a rectangular parallelepiped shape. However, a rectangular parallelepiped shape is preferable because unpacking and canning operations by hand are good. Preferred dimensions of the rectangular parallelepiped shape are “long side P = 300 to 600 mm”, “short side Q = 200 mm to 500 mm”, and “weight = 1 to 6 kg”, but are not limited thereto.

  The group of empty cans 11 to be packed is preferably arranged in a staggered manner in consideration of the difficulty of breaking during transportation. Specifically, the group of empty cans 11 is composed of “7 × 6 rows = 42”, and the empty cans 11 in the front and rear rows are alternately arranged at half the pitch between the empty cans 11 in each row. Yes. Each of the empty cans 11 is formed in a bottomed cylindrical shape. As shown in FIG. 5, the cylindrical can body 11a, the bottom lid 11b for closing the lower end opening of the can body 11a, and the can body 11a It has the top cover 11c of an upper end opening part, and may have the neck part 11d provided in the concave shape between the lower end part of the can body 11a and the bottom cover 11b depending on the case.

  The shrink film 12 holds the empty can group 11 by heat shrinkage, and heats the seal corresponding portions 16a and 17a on the four sides for sealing the periphery of the package group in the base film 16 and 17 (see FIG. 4). Via a heat-sealed portion 13 that has been sealed (thermally welded), a straight first easy-open line 14 formed in the longitudinal direction of the opposite side surface portions 12a on the long side P, and an upper surface portion 12b on the bottom lid 11b side The first easy-open line 14 has a straight second easy-open line 15 that connects the first easy-open lines 14 in an H shape. Further, when the upper and lower surfaces of the shrink wrapping body 10 have a square cubic shape, there is no distinction between the long side P and the short side Q. Therefore, the first easy-open line should be formed on one of the pair of side surfaces facing each other. That's fine.

  The heat seal portion 13 is formed along the longitudinal direction of the side portions 12 a and 12 d on the four sides of the shrink film 12. Specifically, the heat seal part 13 is preferably arranged on the arrangement side of the second easy-open line 15 from the center of the side parts 12a and 12d, that is, on the upper surface part 12b side (bottom lid 11b side). The heat seal part 13 has a high strength because the two base films 16 and 17 are thermally welded.

  The second easy opening line 15 is disposed on the upper surface portion 12b, while the first easy opening line 14 extends from the corner portion 12e to the side surface portion 12d on the short side Q side, as shown in FIG. ing. Therefore, as shown by arrows E and F in FIG. 2, the upper surface portion 12 b can be opened at the time of unpacking by cutting both the first easy opening lines 14 after cutting the second easy opening lines 15. The second easy opening line 15 may be a curved line or a straight line as long as the first easy opening lines 14 are connected to each other, and may be arranged anywhere on the upper surface portion 12b. However, from the viewpoint of workability, the second easy opening line 15 is a straight line. It is preferable that it is disposed near the center of the upper surface portion 12b.

  If the first easy-open line 14 is provided closer to the canopy 11c than the center of the side surface portion 12a, it is difficult to open when unpacking because the position is deep, and after both easy-open lines 14 and 15 are cut off, There is also a risk that the retention will be reduced and scattered. Therefore, it is preferable that the first easy-open line 14 is positioned closer to the bottom lid 11b than the heat seal part 13 is. That is, the first easy-open line 14 is preferably located between the heat seal part 13 and the second easy-open line 15.

  Specifically, the first easy-open line 14 is formed at a position 10 mm from the bottom lid 11b in the side surface portion 12a in consideration of easy opening. In addition, since the heat seal part 13 is not arrange | positioned between both the open lines 14 and 15, the ease of the cutting is not disturbed.

  Each of the easy-open lines 14 and 15 may be a well-known hole such as a circular hole or a polygonal hole, but as shown in FIG. 3, it is configured as a perforation in which vertically long holes 18 are arranged at equal intervals. Is preferred. In addition, the easy-open lines 14 and 15 are not limited to perforations, and may have breakability at the time of unpacking, for example, a line that is cut into the middle. Here, the easy-open lines 14 and 15 will be described as perforations in FIG. 3 as an example.

  The vertically long hole 18 is preferably a rectangular hole or an elliptical hole, and more preferably a rectangular hole (hereinafter, the vertically long hole 18 may be referred to as a rectangular hole 18). If the length L1 in the vertical direction of the rectangular holes 18 is increased and the distance L2 between the rectangular holes 18 is decreased, the ease of cutting the easy-open lines 14 and 15 is improved, but the strength deteriorates. There is a risk of breakage during transportation. On the other hand, if L1 is shortened and L2 is lengthened, the strength of the easy-open lines 14 and 15 is improved, but the ease of cutting is reduced.

  In this shrink wrapping body 10, L1 and L2 were set to substantially the same length in order to balance the ease of cutting the easy-open lines 14 and 15 and the strength. Specific numerical ranges may be “L1 = 0.7 to 1.3 mm” and “L2 = 0.6 to 0.9 mm”, particularly “L1 = 0.9 to 1.1 mm” and “L2 = 0”. .7 to 0.8 mm "is more preferable.

≪Manufacturing method≫
A method for manufacturing the shrink package 10 will be described with reference to FIG. Here, the shrink package 10 is manufactured using the large and small heat-shrinkable base films 16 and 17 shown in FIG. That is, the shrink package 10 is manufactured by subjecting the long base films 16 and 17 to a heat sealing process and a heating process using a predetermined apparatus.

(1) Base film 16, 17
An H-shaped easy-open line α is formed on the base film 16. The easy-open line α has a pair of first easy-open line α1 and a second easy-open line α2 connecting the first easy-open line α1, and each easy-open line α1, α2 Easy-open lines 14 and 15 are formed. The easy-open lines α1 and α2 may be formed by a known method, but a saw blade is preferably used, can be formed at a high speed, and may be formed by a laser.

  The material of the base films 16 and 17 is preferably a polyolefin film, particularly polyethylene fill. The thickness of the base films 16 and 17 is preferably 10 to 100 μm, particularly preferably 20 to 50 μm. Further, the heat shrinkage rate of the base films 16 and 17 can be kept in close contact with each empty can 11 by heat shrinkage, and the easy open lines α1 and α2 are collected after heat collection as a result of the heat shrinkage. The heat shrinkage rate is not particularly limited as long as it can be arranged at positions 14 and 15 and the heat seal portion 13 can be arranged at a necessary position.

(2) Heat sealing process, heating process First, a heat sealing process is demonstrated based on FIG.4 (b). Here, the empty can 11 is formed by sealing the seal corresponding portions 16a on the four sides of the one base film 16 on which the H-shaped easy-open line α is formed and the seal corresponding portions 17a on the four sides of the other base film 17. Cover the group. Specifically, first, the empty cans 11 group are arranged in a staggered manner on the base film 16 with the respective canopies 11c facing upward, and then the base film 17 is placed on the empty cans 11 group.

  Subsequently, a servo motor (not shown) is operated to heat and press the seal corresponding portions 16a and 17a on the four sides of the base films 16 and 17 with a heat sealing seal bar (not shown), The corresponding portions 16a and 17a are heat sealed. As a result, the heat-sealed portions 13 are formed in the heat-sealed portions of the base films 16 and 17, that is, the seal equivalent portions 16 a and 17 a that seal the periphery of the packaged body group, and the empty spaces are formed in the base films 16 and 17. The 11 groups of cans are accommodated gently. At this time, the order of the heat sealing on the four sides is not particularly limited, but the two opposing sides may be heat sealed at the same time, or the other two opposing sides may be heat sealed at the same time, or the four sides may be heat sealed at the same time. Good.

  Next, the heating process will be described with reference to FIG. In the heating step, both the base film 16 and 17 are heated and thermally contracted after the heat sealing step. Specifically, hot air is blown by the hot air blower 20 in the state after the heat sealing step, and the base films 16 and 17 are heated to the heat shrinkage temperature.

  By this heating, the base films 16 and 17 are thermally contracted following the outer shape of the empty can 11 group, and are brought into close contact with the outer shape of the empty can 11 group. Due to this heat shrinkage, the heat seal portion 13 is disposed at a predetermined position, the first easy-open line α1 is disposed at the position as the first easy-open line 14, and the second easy-open line α2 is the second easy-open line 15. It is arranged in the position.

  After the heating, the base films 16 and 17 are cooled to below the heat shrink temperature. This cooling may be natural cooling, but for shortening the time, it is preferable to forcibly lower the temperature by blowing cool air or the like.

  The manufactured shrink package 10 is transported to a filling plant by a truck or the like. At the time of transportation, pallets are stacked in the same manner as in the paper carton, and a number of about 9 packages is preferable in one stage of a pallet (not shown) in view of the loading operation.

≪Canning work≫
The canning operation of the shrink package 10 will be described with reference to FIG. The group of shrink packages 10 transported to the filling factory is unloaded from the pallet, the group of empty cans 11 is taken out, and then the contents are filled in the filling line. Here, a canning operation for taking out the empty can group 11 from the shrink package 10 and supplying it to the filling line will be described.

(1) Work contents FIG. 6A shows a state in which the shrink package 10 lowered from the pallet is placed on the work table 21 in front of the conveyor 22 in the filling line. At this time, the shrink package 10 is placed horizontally with the bottom lids 11b of the empty cans 11 group facing the conveyor 22 side.

  6B, the second easy-open line 15 is cut and the upper surface portion 12b is cut in half. After this cutting, if the holding end 12c of the upper surface portion 12b is held and pulled in the directions of arrows G and H, as shown in FIG. 6C, the first easy opening line 14 is cut and the upper surface portion 12b becomes double-opened. Can be opened.

  At this time, since the first easy-open line 14 is located 10 mm from the bottom lid 11 b, the area where the both side surface parts 12 a are cut off is small, and the empty cans 11 group is maintained in the shrink film 12. In particular, since the heat seal portion 13 is not cut off, the empty can group 11 can be held well, and the empty can group 11 is not scattered after the two easy-open lines 14 and 15 are cut off.

  Thereafter, the shrink wrap 10 is tilted forward with the bottom lid 11b facing the conveyor 22 as shown by the arrow I in FIG. 6 (d), and as shown in FIG. 6 (e), The work table 21 is erected (the canopy 11c is turned up).

  Subsequently, the shrink package 10 is pushed forward and placed on the conveyor 22 as shown by an arrow J in FIG. Then, as shown in FIGS. 6 (g) and (h), if any portion of the shrink film 12 such as the cut end 12c of the upper surface portion 12b is held and pulled upward, the shrink film 12 becomes the empty can 11 group. As shown in FIG. 6 (i), empty cans 11 are provided on the filling line. At this time, when the work table 21 has a large space, the empty cans 11 group unpacked on the work table 21 may be collected and sequentially sent to the conveyor 22.

  In this case, since the first easy-open line 14 is arranged at a position 10 mm from the bottom cover 11b in the both side surface parts 12a instead of the upper surface part 12b, the shrink film 12 is cut when the first easy-open line 14 is cut. Not only the upper surface portion 12b but also both side surface portions 12a are cut from the bottom lid 11b to a range of 10 mm. Therefore, the empty cans 11 are not caught on the shrink film 12 when the films shown in FIGS.

≪Reuse of used shrink film 12≫
The shrink film 12 of the shrink wrapping body 10 has less dirt and breakage when reused like a paper carton, is more recyclable than a paper carton, and is hygienic.

  Therefore, after unpacking, the used shrink film 12 is collected from the filling factory without being discarded, and after collection, recycled polyethylene film is produced through raw material pellets in the recycling industry. A regeneration circulation system for obtaining 16 and 17 has been proposed.

  According to this regeneration circulation system, waste resources can be minimized and the amount of fossil fuel used can be reduced. Moreover, since the shrink film 12 is recycled, there is no need for management such as sorting like a paper carton, and the number of work steps can be reduced.

≪Others≫
The present invention is not limited to the above-described embodiment, and can be implemented by being modified within the scope described in each claim. For example, in the case of a paint can or the like, the shrink wrap 10 has a normal canning work after a preliminary work in which a hole is formed at a position corresponding to the opening of the empty can 11 and a stirring ball (bead) is inserted through a funnel. Can also be implemented.

  Further, the shrink film 12 does not necessarily need to heat seal the seal corresponding portions 16a and 17a on the four sides of the base films 16 and 17, and means such as adhesion may be used.

10 ... Shrink package 11 ... Empty can (package)
DESCRIPTION OF SYMBOLS 12 ... Shrink film 12a ... Opposite side surface part 12b ... Upper surface part 13 ... Heat seal part (sealing part)
DESCRIPTION OF SYMBOLS 14 ... 1st easy open line 15 ... 2nd easy open line 16, 17 ... Base film 16a, 17a ... Seal equivalent part 18 ... Longitudinal hole (rectangular hole)

Claims (3)

A shrink wrapping body in which a group of packaged bodies is wrapped with a shrink film,
A first easy-open line provided on each of the opposing side surfaces of the shrink film, and a second easy-open line connecting the first easy-open lines via one of the upper and lower surfaces of the shrink film; With
The shrink film is formed by sealing portions corresponding to seals that seal the periphery of the package group in two base film films,
The portion of the seal is disposed on the side surface portion and does not overlap with the second easy-open line,
The first easy-open line and the seal portion are arranged on either side of the upper and lower surfaces where the second easy-open line is formed in the side part,
The first easy opening line is located between the seal portion and the second easy opening line,
The shrink wrapping body , wherein ends of the first easy-open lines extend from a corner portion between other side portions adjacent to the opposite side portion to the other side portion .   The shrink package according to claim 1, wherein the package group includes a plurality of packages arranged in a zigzag pattern. The shrink package according to claim 1 or 2 , wherein the first easy-open line and the second easy-open line are configured by perforations in which vertically long holes are arranged at equal intervals.

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