JP2021037994A - Storage bag - Google Patents

Abstract

To provide a storage bag that can reliably weld the edge part of a film part by ultrasonic welding, etc., prevent a welded part from breaking or tearing the bag, and prevent a content from leaking out and the outside air, dust, etc. from entering.SOLUTION: The edge parts of a pair of film parts 11 of a storage bag 10 are integrated to form a welding pattern 13 on the edge parts. The welding pattern 13 includes a plurality of intermittent welding parts 14 arranged at intervals in an edge length direction along the edge part, and a connecting welding part 15 connecting adjacent intermittent welding parts. A non-joint part 16 is formed in a part between adjacent intermittent welding parts 14 excluding the connecting welding part 15.SELECTED DRAWING: Figure 4

Description

The present invention relates to a storage bag formed by welding (sealing) the edges of a pair of film portions, and relates to a storage bag suitable for, for example, a two-sided bag or a three-sided bag.

This type of storage bag contains a pair of film portions facing each other. The edges of these film portions, excluding creases and openings, are joined and integrated by welding. As a welding means, heat sealing is generally used.
On the other hand, when the content to be accommodated is an adhesive such as an adhesive, a release layer such as silicone is often applied to the inner surface of the film portion, but it is difficult to heat-seal if there is a release layer. .. Therefore, the release layer is not applied to the edge portion of the film portion to be heat-sealed. However, it is complicated to separate the coated portion and the non-coated portion of the release layer, and it is also difficult to align them at the time of heat sealing and cutting.

Patent Document 1 discloses a bag whose edge is sealed by ultrasonic welding. According to ultrasonic welding, even the coated portion of the release layer can be welded.

Jikkai Sho 59-115747

According to the inventor's knowledge, when linear welding is performed continuously by ultrasonic waves along the edge of the film, pinholes (through holes) and edge breaks (edge breakage) occur when the pressure applied during welding is large. Is prone to breakage. Although it is possible to prevent the bag from breaking by reducing the pressing force during ultrasonic welding, the welding strength is insufficient and the welded portion may easily open and the bag may break. If ultrasonic welding is performed intermittently, it is possible to prevent breakage of pinholes even if the pressing force is increased, but the contents may leak between the intermittently welded parts, or air or dust from the outside. May get in.
Based on such circumstances, the present invention can reliably weld the edge of the film portion by ultrasonic welding or the like, prevent breakage or bag breakage due to poor welding, and prevent leakage of contents and entry of outside air and dust. The purpose is to provide a storage bag that can be used.

In order to solve the above-mentioned problems, the present invention comprises a pair of film portions in which accommodation chambers are defined between each other and the edges are aligned with each other.
With a welding pattern formed on the edge,
The welding pattern includes a plurality of intermittent welding portions arranged at intervals in the edge length direction along the edge portion, and a connecting welding portion connecting adjacent intermittent welding portions.
In each intermittent welding part and connecting welding part, the pair of film parts are welded to each other.
A storage bag is characterized in that a non-joined portion in which the pair of film portions are not joined is formed in a portion of the adjacent intermittent welded portions other than the connected welded portion.

Preferably, a release layer is formed over the entire inner surface of the film portion facing the storage chamber.
The welding pattern is formed by ultrasonic welding.
As a result, welding can be reliably performed even if there is a release layer. When forming the intermittent welding portion, even if the pressing force of ultrasonic welding is increased to some extent, it is possible to prevent breakage such as pinholes and edge breakage. By increasing the pressing force, the joint strength of the intermittently welded portion is increased. Therefore, when the content is a solid or a highly viscous substance, the intermittent welding portion can prevent the content from being extruded from the storage chamber, and the bag can be reliably prevented from breaking. Further, by providing the connecting and welding portion, it is possible to prevent the contents from leaking and from the outside such as air and dust from entering the accommodation chamber.

It is preferable that the bonding strength of the intermittent welding portion is higher than the bonding strength of the connecting welding portion. By increasing the joint strength of the intermittently welded portion, it is possible to reliably prevent the extruding of solid or highly viscous contents, and eventually the bag breakage. Moreover, by lowering the joint strength of the connecting welded portion, it is possible to prevent breakage from occurring at the intersection of the intermittent welded portion and the connected welded portion.

It is preferable that each intermittent welding portion has an elongated shape (short line shape) extending in the edge width direction orthogonal to the edge portion. As a result, the intermittently welded portion can sufficiently resist the pushing force of the solid or high-viscosity contents, and the pushing can be reliably prevented.
The intermittent welding portion may be oblique with respect to the edge width direction and the edge length direction.
The connected welding portions adjacent to each other with the intermittent welding portion of 1 in between may be displaced in the edge width direction. As a result, the intermittent welding portion and the connecting welding portion can be prevented from crossing each other, and the fracture at the intersection can be reliably prevented.

According to the storage bag of the present invention, the edge of the film portion can be reliably welded by ultrasonic welding or the like, breakage or bag breakage due to poor welding can be prevented, and leakage of contents and entry of outside air and dust can be prevented. it can.

FIG. 1 is a front view of the storage bag according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view of the storage bag along the line II-II of FIG. FIG. 3 is an enlarged cross-sectional view of the circles IIIa and IIIb of FIG. FIG. 4 is an enlarged front view of the circle portion IV of FIG. FIG. 5 is a cross-sectional view taken along the line VV of FIG. FIG. 6 is a perspective view illustrating the manufacturing process of the storage bag in an explanatory manner. FIG. 7 is an explanatory front view of the ultrasonic welding machine along the line VII-VII of FIG. FIG. 8 is an enlarged front view showing a part of the side edge portion of the storage bag according to the second embodiment of the present invention. FIG. 9 is an enlarged front view showing a part of the side edge portion of the storage bag according to the third embodiment of the present invention. FIG. 10 is an enlarged front view showing a part of the side edge portion of the storage bag according to the fourth embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 show the storage bag 10 according to the first embodiment.
The content 9 of the storage bag 10 is, for example, a hot melt adhesive (adhesive substance). The hot melt adhesive is heated and melted to have a low viscosity when it is filled in the storage bag 10, and then cooled to be cured.

The storage bag 10 is composed of one resin film 19. The material of the resin film 19 may be a polyolefin resin such as polyethylene (PE) or polypropylene (PP), or may be polyethylene terephthalate (PET), nylon (registered trademark), or other resin. The resin film 19 preferably has heat resistance to the extent that it does not melt at the heating temperature at the time of filling the hot melt adhesive. From the viewpoint of heat resistance, 6 nylon (registered trademark), 66 nylon (registered trademark) and the like are suitable.
The resin film 19 may be a laminated film in which a plurality of resin layers are laminated. The laminated film may contain a metal barrier layer such as aluminum.

As shown in FIGS. 1 and 2, the resin film 19 is folded in half to form a pair of film portions 11. The film portions 11 are integrally connected via the crease 10f. The fold 10f is arranged at the bottom edge of the storage bag 10. The location of the crease 10f is not limited to the bottom edge. Either the left or right edge portion 10b or 10b of the storage bag 10 may be a crease. The upper edge 10e of the storage bag 10 may be a crease.
A pair of film portions 11 face each other, and a storage chamber 10c is defined between them. The content 9 made of the hot melt adhesive is housed in the storage chamber 10c.
In the figure, the thickness of the resin film 19 is exaggerated.

As shown in FIG. 3, the release layer 12 is formed on the entire area of the inner surface 19a of the resin film 19 and thus the film portion 11 facing the accommodation chamber 10c. The release layer 12 is made of, for example, a silicone resin. The thickness of the release layer 12 is preferably 1 μm or less.

As shown in FIG. 1, the film portions 11 and thus the three edge portions 10b, 10b, 10e excluding the crease 10f in the storage bag 10 are aligned with each other. A welding pattern 13 is formed on these edge portions 10b, 10b, 10e along the extending direction (edge length direction) of the edge portion.

As shown in FIGS. 1 and 4, the welding pattern 13 includes a large number (plurality) of intermittent welding portions 14 and a connecting welding portion 15. These welded portions 14, 15 and thus the welded pattern 13 are preferably formed by ultrasonic welding.
Each intermittent welding portion 14 has an elongated shape (short line shape) extending in the edge width direction orthogonal to the edge length direction of the corresponding edge portions 10b, 10b, 10e. A plurality of intermittently welded portions 14 are arranged at equal intervals, preferably spaced apart from each other in the edge length direction of the corresponding edge portions 10b, 10b, 10e.
_{The arrangement pitch P 14} between the adjacent intermittent welding portions 14 _{is preferably about P 14} = 0.1 mm to 3 mm, and more preferably _{about P 14} = 0.5 to 2 mm.
The width W ₁₃ of the _{welding pattern 13 is preferably about W 13} = 1 mm to 10 mm.

The connecting welded portion 15 extends straight in the edge length direction of the corresponding edge portions 10b, 10b, 10e. The outer end portion (the end portion facing the side opposite to the accommodation chamber 10c, the right end portion in FIG. 2) of each intermittent welding portion 14 is integrally connected with the connecting welding portion 15. The outer ends of adjacent intermittent welding portions 14 (ends on the same side in the edge width direction) are connected by a connecting welding portion 15.

In each of the intermittent welding portions 14 and the connecting welding portions 15, a pair of film portions 11 are welded together to be joined and integrated.
The bonding strength of the intermittent welding portion 14 is higher than the bonding strength of the connecting welding portion 15. Preferably, the intermittently welded portion 14 is firmly joined so as not to be peeled off, and the material is broken when a peeling force exceeding the joining strength is applied. The connecting welded portion 15 may be peelable with a peeling force lower than the bonding strength.

As shown in FIGS. 4 and 5, a non-joint portion 16 is formed between adjacent intermittent welded portions 14 (excluding a portion where the connected welded portion 15 is arranged). In the non-bonded portion 16, the film portions 11 are not bonded to each other.

The storage bag 10 is manufactured as follows.
As shown in FIG. 6, a continuous resin film 19X, which is the original fabric of the resin film 19, is prepared. The entire area of the inner surface 19a of the continuous resin film 19X is coated with the release layer 12 (shaded pattern in FIG. 6) in advance. It is not necessary to divide the release layer 12 into a portion to be coated and a portion not to be coated. Therefore, a pattern coating machine is not required, the release layer 12 can be easily coated, and productivity can be improved.

The continuous resin film 19X is unwound from the roll 21 and fed in the feed direction MD. The continuous resin film 19X is folded in half at the central portion in the width direction. As a result, the portions that should be the pair of film portions 11 and 11 are overlapped with each other. In that state, the continuous resin film 19X is introduced into the ultrasonic welding machines 30 for the side edges 10b and 10b.

As shown in FIGS. 6 and 7, the ultrasonic welding machine 30 has a horn 31 and a receiving portion 32. The horn 31 and the receiving portion 32 face each other with the transport line of the continuous resin film 19X interposed therebetween. The horn 31 is ultrasonically vibrated by the ultrasonic vibration driving unit 33. The receiving portion 32 has a circular rotating disk 34 and a box-shaped bearing portion 35. A rotating disk 34 is supported on the bearing portion 35 so as to be freely rotatable around the central axis.

An uneven pattern 36 corresponding to the welding pattern 13 of the side edge portion 10b is formed on the outer peripheral portion of the turntable 34. The uneven pattern 36 includes a flat knurl 36a and a circumferential convex portion 36b. The pitch of the flat knurl 36a coincides with _{the pitch P 14 of the intermittent welding portion 14.} A circumferential convex portion 36b is formed on the side portion of the flat knurl 36a. The circumferential convex portion 36b has an annular shape in the circumferential direction of the turntable 34. Adjacent convex portions of the flat knurls 36a are connected to each other by the circumferential convex portions 36b.
Preferably, the circumferential convex portion 36b has a lower protrusion height than the convex portion of the flat knurl 36a.

The ultrasonic welding machine 30 forms a welding pattern 13 of the side edges 10b and 10b. Specifically, a pressing force is applied by sandwiching a portion of the two-fold continuous resin film 19X that should be the edge portion 10b between the rotating disk 34 of the receiving portion 32 and the horn 31, and the horn 31 is ultrasonically generated. Vibrate. In parallel, the horn 31 and the receiving portion 32 are relatively moved in the edge length direction (vertical direction in FIG. 6) of the side edge portion 10b with respect to the continuous resin film 19X. The turntable 34 is rolled along with the movement.
In FIGS. 6 and 7, the horn 31 and the receiving portion 32 are shown separately from the film portion 11 for convenience of drawing.

As a result, the welding pattern 13 of one edge portion 10b is formed. The intermittent welding portion 14 is formed by the convex portion of the flat knurl 36a. The non-joint portion 16 is formed by the recesses of the flat knurl 36a. The connecting welded portion 15 is formed by the circumferential convex portion 36b.
By intermittently or discontinuously ultrasonic welding the intermittently welded portion 14, it is possible to prevent pinholes, edge breakage, and other breaks in the film portion 11 even if the pressing force is increased to some extent. By increasing the pressing force, the bonding strength of the intermittent welding portion 14 can be increased. By adopting ultrasonic welding as the welding means, the film portions 11 can be reliably welded to each other even if the release layer 12 is present.
By making the convex portion 36b in the circumferential direction lower than the convex portion of the flat knurl 36a, the joint strength of the connecting welded portion 15 is weakened. As a result, it is possible to prevent breakage from occurring at the intersection of the intermittent welding portion 14 and the connecting welding portion 15.

Next, the continuous resin film 19X is fed to the feed direction MD by the stroke of the interval between the left and right edge portions 10b and 10b of the storage bag 10. As a result, the ultrasonic welding machine 30 is arranged at a position facing the portion to be another edge portion 10b.
Subsequently, the receiving portion 32 of the ultrasonic welding machine 30 is inverted 180 degrees up and down. Then, the welding pattern 13 of the other edge portion 10b is formed by the ultrasonic welding machine 30 in the same manner as before.
As a result, an empty storage bag 10X is formed in a part of the continuous resin film 19X with the upper edge portion 10e unsealed and containing no contents.

A bag opening 41 and a filling nozzle 42 are provided on the downstream side of the feeding direction MD with respect to the ultrasonic welding machine 30. The bag opening 41 includes a pair of suction cups 43 and a suction cup drive unit (not shown).
After the suction cups 43 have attracted both film portions 11 of the storage bag 10X, they are separated from each other. As a result, the upper edge portion 10e of the storage bag 10X is opened. The filling nozzle 42 faces above the opened edge portion 10e.
Subsequently, the hot melt adhesive (content 9) is discharged from the filling nozzle 42 in a heated and melted state to fill the storage chamber 10c in the storage bag 10X.
After that, the suction of the suction cup 43 is released.

An ultrasonic welding machine 50 for the upper edge portion 10e is provided on the downstream side of the bag opening 41 and the filling nozzle 42 in the feed direction MD. The ultrasonic welding machine 50 has the same structure as the ultrasonic welding machine 30 except that the orientation differs from that of the ultrasonic welding machine 30 by 90 degrees.
That is, the ultrasonic welding machine 50 includes a horn 51, a receiving portion 52, and an ultrasonic vibration driving portion 53. The receiving portion 52 has a turntable 54 and a bearing portion 55. An uneven pattern 56 corresponding to the welding pattern 13 of the upper edge portion 10e is formed on the outer peripheral portion of the turntable 54. The uneven pattern 56 includes a flat knurl 56a and a circumferential convex portion 56b.

A pressing force is applied by sandwiching the edge portion 10e of the storage bag 10X between the rotating disk 54 of the receiving portion 52 of the ultrasonic welding machine 50 and the horn 51, and the horn 51 is ultrasonically vibrated. In parallel, the horn 51 and the receiving portion 52 are relatively moved with respect to the storage bag 10X in the edge length direction (the same direction as the feeding direction MD) of the edge portion 10e. By feeding the continuous resin film 19X by one stroke, the relative movement of the horn 51 and the receiving portion 52 and the storage bag 10X may be performed. The turntable 54 is rolled along with the movement.

As a result, the welding pattern 13 is formed on the upper edge portion 10e. By adopting ultrasonic welding as the welding means, the edge portion 10e can be reliably welded even if there is a release layer 12. The intermittent welding portion 14 is formed by the convex portion of the flat knurl 56a. The non-joint portion 16 is formed by the recesses of the flat knurl 56a. The connecting welded portion 15 is formed by the circumferential convex portion 56b.
As for the upper edge portion 10e, it is possible to increase the joint strength while preventing the intermittent welding portion 14 from breaking, and further prevent the breaking at the intersection between the intermittent welding portion 14 and the connecting welding portion 15. ..
In this way, the four edges of the storage bag 10X are closed, and the hot melt adhesive (content 9) is sealed inside the four edges.

A cutter 61 is provided on the downstream side of the feeding direction MD with respect to the ultrasonic welding machine 50.
The cutter 61 cuts out the storage bag 10 containing the content 9 (hot melt adhesive) from the continuous resin film 19X.

As shown by the alternate long and short dash line in FIG. 4, since the hot melt adhesive (content 9) immediately after filling in the storage bag 10 has fluidity, the pair of film portions 11 in the non-bonded portion 16 It tries to enter the gap 16c between them. On the other hand, the hot melt adhesive has a high viscosity, and the gap 16c is narrow and elongated, so that a large distribution resistance acts. This prevents the hot melt adhesive (content 9) from passing through the gap 16c, which in turn prevents it from leaking to the outside.

When the hot melt adhesive (contents 9) cured in the storage bag 10 tries to move toward, for example, the edge portion 10b, the intermittent welding portion 14 can prevent the movement. Since the intermittent welding portion 14 has high bonding strength and extends in the edge width direction, the movement can be reliably prevented. Therefore, it is possible to prevent the storage bag 10 from being broken and the contents 9 being pushed out. Since the intermittent welding portion 14 has a function of preventing the contents 9 from being pushed out, the bonding strength of the connecting welding portion 15 can be low.

Gases, liquids and other low-viscosity fluids containing volatile components from the contents 9 in the containment chamber 10c can flow into the gap 16c. Since the gap 16c is narrow, the low-viscosity fluid that has entered the gap 16c is sufficiently energized. Further, the connecting welded portion 15 is prevented from passing through the gap 16c. Therefore, it is possible to prevent the low-viscosity fluid from leaking from the storage bag 10.
Even if the welding strength of the connecting welding portion 15 is low, the low-viscosity fluid in the gap 16c is sufficiently deenergized, so that the connecting welding portion 15 can be prevented from being broken by the fluid pressure of the low-viscosity fluid.
Further, the connecting welding portion 15 can prevent air, dust and other pollutants from entering the inside of the accommodating chamber 10c through the gap 16c from the outside.

Next, other embodiments of the present invention will be described. In the following embodiments, the same reference numerals are given to the drawings for configurations that overlap with the above-described embodiments to simplify the description.
<Second Embodiment>
FIG. 8 shows a second embodiment of the present invention. In the storage bag 10B of the second embodiment, the connecting welding portion 15 of the welding pattern 13B extends in a straight line in the edge length direction so as to intersect the intermediate portion in the edge width direction of each intermittent welding portion 14. Intermediate portions of adjacent intermittent welding portions 14 in the edge width direction are connected by a connecting welding portion 15. A non-joint portion 16 is formed in a portion between adjacent intermittent welded portions 14 except for a connected welded portion 15.

<Third Embodiment>
FIG. 9 shows a third embodiment of the present invention. In the storage bag 10C of the third embodiment, two (plurality) connecting welding portions 15 of the welding pattern 13C are formed side by side in the edge width direction. Each connected welding portion 15 extends in a straight line in the edge length direction so as to intersect the intermittent welding portion 14. Adjacent intermittent welding portions 14 are connected by two connecting welding portions 15 at two locations in the edge width direction.

<Fourth Embodiment>
FIG. 10 shows a fourth embodiment of the present invention. In the storage bag 10D of the fourth embodiment, the connected welding portions 15 adjacent to each other with the intermittent welding portions 14 of the welding pattern 13D interposed therebetween are displaced in the edge width direction.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, the welding pattern 13 is not limited to the pattern of the embodiment.
The intermittent welded portion 14 may have a small circular shape or a spot shape. A large number (plurality) of small circular or spot-shaped intermittent welds may be arranged in a regular pattern such as a triangular lattice or a square lattice.
The welding pattern may be irregular.
The method and apparatus for manufacturing the storage bag are not limited to those of the embodiment, and can be appropriately modified.
One ultrasonic welding machine may be shared for welding of the side edges 10b and 10b and welding of the upper edge 10e.
Two ultrasonic welding machines 30 may be arranged side by side to weld the two edges 10b and 10b at the same time.
The receiving portion of the ultrasonic welding machine may have a stage shape with an uneven pattern. The stage-shaped receiving portion may be fixed in position with respect to the film portion, and the horn may be moved relative to the stage-shaped receiving portion and the film portion.
The content 9 is not limited to the hot melt adhesive, and may be a viscous solvent, a viscous food, or other sticky substance. Further, the material is not limited to the adhesive material, and may be a powder, a granular material, a liquid material, or a solid material.
The release layer 12 may be omitted.
The welding method is not limited to ultrasonic welding, and may be heat sealing or the like.

The present invention can be applied to, for example, a package of a hot melt adhesive.

9 Contents 10 Storage bag 10B-10D Storage bag 10b Edge 10c Storage chamber 10e Upper edge 10f Fold 11 Film part 12 Release layer 13 Welding pattern 13B to 13D Welding pattern P ₁₄ Arrangement pitch W ₁₃ Welding pattern width 14 Intermittent Welding part 15 Connecting welding part 16 Non-joining part 16c Gap 19 Resin film 19a Inner surface 19X Continuous resin film 21 Roll MD Feeding direction 30 Ultrasonic welding machine 31 Horn 32 Receiving part 33 Ultrasonic vibration driving part 34 Rotating plate 35 Bearing part 36 Concavo-convex Pattern 36a Flat Lauret 36b Circumferential Convex 41 Bag Opening 42 Filling Nozzle 43 Sucker 50 Ultrasonic Welder 51 Horn 52 Receiving 53 Ultrasonic Vibration Drive 54 Rotating Plate 55 Bearing 56 Concavo-convex Pattern 56a Flat Lauret 56b Part 61 Cutter

Claims (4)

A pair of film parts that define a containment chamber between each other and the edges are aligned with each other,
With a welding pattern formed on the edge,
The welding pattern includes a plurality of intermittent welding portions arranged at intervals in the edge length direction along the edge portion, and a connecting welding portion connecting adjacent intermittent welding portions.
In each intermittent welding part and connecting welding part, the pair of film parts are welded to each other.
A storage bag characterized in that a non-joined portion in which the pair of film portions are not joined is formed in a portion of the adjacent intermittent welded portions other than the connected welded portion. The storage bag according to claim 1, wherein the bonding strength of the intermittent welding portion is higher than the bonding strength of the connecting welding portion. The storage bag according to claim 1 or 2, wherein each intermittent welding portion has an elongated shape extending in the edge width direction orthogonal to the edge portion. A release layer is formed over the entire inner surface of the film portion facing the storage chamber.
The storage bag according to any one of claims 1 to 3, wherein the welding pattern is formed by ultrasonic welding.

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