JP3909399B2 - Method for forming a pick piece for opening a package of film packaging - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat-shrinkable film (shrink wrapping) for wrapping a product to be packaged such as a container. Specifically, the heat-shrinkable film is formed integrally with the heat-shrinkable film in order to easily break the heat-shrinkable film. The present invention relates to a method for forming an opening tab.
[0002]
[Prior art]
In general, when packaging an object to be packaged with a heat-shrinkable film, as shown in FIG. 8, the heat-shrinkable film 1 is formed into a cylinder shape with a foamer 12 so as to surround the object to be packaged A. The lower overlapping portions 1A and 1B (see FIG. 9R> 9) are welded by a vertical sealer 13 to form an opening knob 1C having a predetermined width, and a cylindrical film 1D on which the opening knob 1C is formed. Then, the package A is advanced, and the overlapping portions 1E, 1F of the cylindrical film 1D on the traveling side of the package A are melted by the horizontal sealer 14, and the blown cylindrical film 1D and the package A are melted. At the time of the predetermined distance, the overlapping portions 1G and 1H of the tubular film 1D on the rear side of the package A are melted by the horizontal sealer 14, and the package A having the advancing side and the rear side melted. Pass the film bag 1I into the shrink tunnel 15 Te, by a film bag 1I is heat shrunk this shrink tunnel 15 inside to obtain a packaging state of the heat shrinkable film 10 as shown in FIG. 10.
[0003]
[Problems to be solved by the invention]
However, the packaging of the heat-shrinkable film 10 has a problem that even if the free end 1C ″ side of the opening tab 1C is picked with a finger and pulled, the heat-shrinkable film only stretches and is not easily broken. The present invention provides a method for forming a tear for opening a packaging film, which can easily break a heat-shrinkable film and pulls the opening handle with a finger and does not need to be greatly modified. The purpose is to do.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a heat-shrinkable film in which an object to be packaged is packaged with a predetermined-width opening tab integrally formed over a predetermined length, and the opening-opening tab is a heat-shrinkable film. In the package of the film packaging made by welding the overlapped portion of the film with a sealer before the heat shrinkage of the film, at least in the circumferential direction and the axial direction of the surface applied to the root side of the overlapped portion of the film Using a sealer in which small protrusions are scattered, the overlapping portions are welded with the small protrusions so as to form a fusion hole in at least one of the overlapping portions to form an opening knob having a predetermined width. , the film when thermally shrink to be packaged, I pulling in a direction for peeling the base side of the overlapping portion was welded by the heat shrinkage, the base side of the overlapping portion which is formed of the molten hole To, in which so as to form over the intermittently a predetermined length a number of small holes on the root side of the opening for the tab.
[0005]
By the above method, an intermittent small hole is formed on the base side of the opening tab of the package to be wrapped in the film over a predetermined length. Therefore , if the opening tab is picked and pulled, a crack is generated between the small holes. As a result, the heat shrinkable film is broken. In this case, intermittent small holes of a predetermined length are formed based on the distance between the small protrusions scattered on the sealer, so that the pitch interval of each small hole is very small, thereby easily breaking the heat shrink film. can do. In addition, according to the method of the present invention, the melted hole is formed by the sealer in which the small protrusions are scattered, and finally the intermittent small hole is formed. In addition, the packaging equipment does not need to be greatly modified, and the durability is good as equipment for making intermittent small holes.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a packaging facility for explaining an embodiment of the present invention. Using this packaging facility, a wide heat-shrinkable film made of vinyl chloride, polypropylene, polyethylene or the like is first used. 1 is formed into a cylinder with a foam 2 so as to surround a packaged object A such as a traveling container, and the overlapping portions 1A and 1B on the lower side of the tubular film 1 are vertically sealed 3 as shown in FIG. Weld with. The vertical sealer 3 has a pair of rotating rollers 3A and 3B. The peripheral surface of one rotating roller 3A is dotted with small protrusions 3a on the entire surface in the circumferential direction and the axial direction, and the other rotating roller 3B. The circumference of the is flat. Therefore, when the lower overlapping portions 1A and 1B on the lower side of the film 1 are clamped by the rotating rollers 3A and 3B, the small protrusions 3a of the rotating roller 3A are lowered by the heat as shown in FIG. The overlapping portions 1A and 1B are melted into the overlapping portions 1A and 1B, and the overlapping portions 1A and 1B are welded to each other (this welded portion is a portion indicated by a bold line in FIG. 3A). ). By this welding, as shown in FIG. 3 (B), an opening knob 1C having a predetermined width having a number of melting holes 1a corresponding to the small protrusions 3a of the rotating roller 3A is formed in the vertical and horizontal directions of the overlapping portion 1A. . As shown in FIG. 3 (A), the leading end side of the opening tab 1C is trimmed to a predetermined width by the clamping force between the protruding blade 3b of the rotating roller 3A and the receiving surface of the rotating roller 3B. Next, the cylindrical film 1D having the predetermined width opening knob 1C formed thereon and the article to be packaged A proceed, and the overlapping part 1E of the cylindrical film 1D on the traveling side of the article to be packaged A is advanced. , 1F is welded and cut by a known swivel type horizontal sealer 4 (hereinafter, the welded cut is referred to as fusing). Then, the cylindrical film 1D in which the overlapping portions 1E and 1F are melted and the packaging object A are advanced, and the cylindrical film 1D on the rear side of the packaging object A is overlapped when a predetermined distance is reached. The parts 1G and 1H are melted by the horizontal sealer 4 to form the film bag 1I containing the package A. Next, the film bag 1I containing the packaged product A, whose advancing side and rear side are melted, is passed through the shrink tunnel 5, and the film bag 1I is thermally shrunk in the shrink tunnel 5. At this time, due to the thermal contraction, as shown in FIG. 4, the tensile forces F and F in the direction to peel them off are applied to the welded overlapping portions 1 </ b> A and 1 </ b> B on the root side of the opening tab 1 </ b> C. Is pulled away in the direction of peeling, and the melting holes 1a are peeled off and a large number of small holes 6 are intermittently formed over a predetermined length on the base side of the opening tab 1C as shown in FIG. It is. It should be noted that the base side of the opened opening tab 1C can be separated when the pulling force F, F becomes larger than the base side of the opening tab 1C. It is necessary to select the material and thickness of the heat-shrinkable film 1, and adjust the sealing pressure of the sealer (particularly the clamping pressure on the base side of the overlapping portion) and the temperature in the shrink tunnel 5.
[0007]
In the above embodiment, with respect to the horizontal sealer 4 shown in FIG. 1, the overlapping portions 1E, 1F on the traveling side and the overlapping portions 1G, 1H on the rear side of the cylindrical film 1D are fused. Instead of the sealer 4, a horizontal sealer 7 shown in FIG. 6 may be used. The horizontal sealer 7 has a pair of swivel dies 7A and 7B and a pair of swirl fusing dies 7C and 7D on the rear side of the swivel dies 7A and 7B. The protrusions 7a are dotted in the vertical and horizontal directions, and the arcuate tip surface of the other swivel type 7 is flat. Therefore, when the overlapping portions 1G and 1H on the rear side of the cylindrical film 1D are clamped by the pair of swivel dies 7A and 7B, the small protrusions of the swivel dies 7A are the same as described with reference to FIG. 7a... Melts the overlapping portions 1G and 1H by the heat and bites into the overlapping portions 1G and 1H to weld the overlapping portions 1G and 1H to each other. An opening knob 1C ′ having a predetermined width and having a number of melting holes corresponding to the small protrusions 7a... Is formed. Further, the rear end of the opening tab 1C ′ and the overlapping portions 1E and 1F of the subsequent cylindrical film 1D are melted by the swirl cutting molds 7C and 7D. For this reason, when the film bag 1I ′ containing the article to be packaged A in which the preceding opening tab 1C ′ is formed is heat-shrinked through the shrink tunnel 5, it is overlapped as in the case described in FIG. The base side of the mating portions 1G and 1H is pulled to peel off the melt hole on the base side, and an intermittent small hole having a predetermined length is formed on the base side of the opening tab. In addition, the horizontal sealer 7 that forms the opening tab 1C ′ may be one in which a pair of swivel dies 7A and 7B are arranged on the rear side, and a pair of swirl fusing dies 7C and 7D on the traveling side. In this case, the overlapping portions 1G and 1H are melted, and the overlapping portions 1E and 1F are welded over a predetermined width to form an opening tab 1C ', and finally, on the root side of the opening tab 1C'. An intermittent small hole having a predetermined length is formed. Further, the horizontal sealer forming the opening tab 1C ′ is not limited to the swivel type, but may be a pressing type that linearly advances and retreats with respect to the overlapping portion of the cylindrical film 1D. When the horizontal sealer forming the opening tab 1C ′ is used, a fusing type vertical sealer 8 shown in FIG. 7 may be used instead of the vertical sealer 3 described above.
[0008]
Further, in each of the above embodiments, intermittent small holes 6 of a predetermined length are formed in a circle, but the amount of separation (peeling) on the base side of the overlapping portions 1A, 1B (1G, 1H) , And the small holes on the root side of the opening tab 1C (1C ′) to be finally formed may have a semicircular shape such as a semicircular shape. Even this, the opening tab 1C (1C ′) ) Is pulled with a finger and pulled, cracks are generated between the small holes, and the heat-shrinkable film can be easily broken. In addition, if the cross section of the small protrusions 3a ... (7a ...) is not limited to a circle, the small holes finally formed can also be formed in a diamond shape, an elongated shape, etc. The film can be easily broken. Further, in each of the above embodiments, one row of the fusion holes 1a... On the base side of the overlapping portions 1A, 1B (1G, 1H) is separated at the time of heat shrinking, but of course the overlapping portions 1A, 1B (1G , 1H) may be separated from the plurality of rows of melting holes 1a on the root side, and a plurality of rows of intermittent small holes 6 may be formed on the root side of the opening tab 1C (1C '). Also, in order to reduce or eliminate the welding force on the base side of the overlapping portions 1A, 1B (1G, 1H) and to facilitate the separation of the base portions of the overlapping portions 1A, 1B (1G, 1H), Whether the protruding amount of the small protrusions 3a (7a ...) of the rotating roller 3A (swivel type 7A or pressing type) corresponding to the base side of the mating portions 1A, 1B (1G, 1H) is reduced (FIG. Or the diameter (length) of the rotating roller 3B (swivel type 7B or pressing type) corresponding to the base side of the overlapping portions 1A, 1B (1G, 1H) is set to a small diameter (short size). (See the two-dot chain line P2 in FIG. 3A) or both of them. Further, in each of the above embodiments, as the sealer for forming the melting hole 1a, the rotating roller 3A (the swivel type 7A or the pressing type) having the small protrusion 3a (7a) on one side is used. , 3B (the swivel type 7A, 7B or the pressing type) may be formed with small protrusions 3a (7a) which are bent in the axial direction (vertical direction). In each of the above embodiments, the intermittent small holes 6 are formed only on the base side of the overlapping portion 1A (1G) of the opening tab 1C (1C ′), but the melting holes 1a are overlapped. It may also be formed on the portion 1B (1H), and intermittent small holes 6 may be formed on the base side of the overlapping portions 1A, 1B (1G, 1H) of the opening tab 1C (1C ′).
[0009]
【The invention's effect】
As described above, according to the present invention, an intermittent small hole is reliably formed over a predetermined length on the root side of the opening tab of the film package, so that the opening tab is picked with a finger. The heat-shrinkable film can be easily broken by pulling it, and it is not necessary to greatly modify the packaging equipment. Further, the equipment for making intermittent small holes for breaking is extremely good.
[Brief description of the drawings]
FIG. 1 is a schematic side view of a packaging facility for explaining one embodiment of the present invention.
FIG. 2 is a schematic cross-sectional view in which a lower overlap portion of a tubular film is welded with a vertical sealer.
3A is an enlarged cross-sectional view of the main part of FIG. 2, and FIG. 3B is an explanatory view showing a part of the opening tab.
FIG. 4 is a cross-sectional view of the main part in a state in which a tensile force is applied to the opening tab of the film bag during thermal contraction.
FIG. 5 is an explanatory view showing a part of an opening tab after heat shrinkage of a film bag.
FIG. 6 is a schematic cross-sectional view for explaining a horizontal sealer forming a pick piece for opening.
FIG. 7 is a cross-sectional view of a vertical sealer for fusing a lower overlapping portion of a cylindrical film.
FIG. 8 is a schematic side view showing a conventional packaging facility.
9 is a schematic sectional view of a vertical sealer portion of the packaging facility of FIG.
10 is a perspective view of the heat-shrink film obtained by using the packaging facility of FIG. 8 in a packaging state.
[Explanation of symbols]
A Package 1 Heat-shrinkable film 1A, 1B Overlapping portion of the bottomed film 1C Opening tab 1D Cylindrical film 1E, 1F Overlapping portion 1G of the tubular film 1G , 1H Overlapping part on the rear side of the cylindrical film 1I Film bag 3 Vertical sealer 5 Shrink tunnel 3a Small projection 6 Small hole 7 Horizontal sealer 7a Small projection 1C 'Opening tab 1I' Film bag

Claims (1)

An opening tab having a predetermined width is integrally formed over a predetermined length on a heat-shrinkable film that wraps an object to be packaged. in the packaged articles of film package which is made by welding by using a sealer that at least the small projections are interspersed formed in the circumferential direction and the axial direction of the surface abutted on the root side of the overlapping portion of the film When the overlapped portion is welded in a state where a melting hole is formed in at least one of the overlapped portions by the small protrusions to form an opening knob with a predetermined width, and the film is thermally contracted to the package , I pulling in a direction for peeling the base side of the overlapping portion was welded by the heat shrinking away root side of the overlapping portion formed in the molten holes, a number of the base side of the opening for the tab Intermittently opening for the tab formation process of the packaged articles of film package, characterized in that so as to form over a predetermined length of the hole.

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