JPH02286230A - Manufacture of square bottom bag from beltlike cylinder body and device therefor - Google Patents

Abstract

PURPOSE:To drastically enhance manufacturing efficiency of a square bottom bag by feeding a synthetic resin film from a beltlike cylinder and extending it in a nearly triangular blade shape and sealing the interval of the respective holding parts as the lugs rectangular to the axial direction of the pinching rollers and forming the sealed parts of the side parts into the bladelike extending parts and cutting both the outsides of the sealed parts of the side parts and the end part becoming an opening edge. CONSTITUTION:The nearly central two edges of a pinched flat end edge are sucked and held by a vacuum sucking means 15 and opened a little. An extending means 17 is moved to the direction rectangular to the axial direction of a pinching roller 13. Two edges of a film 11 are mutually peeled and successively fed and extended to a nearly triangular blade shape which has the holding parts made of a pair of holding pawls 16 as a vertex. The film 11 between the holding parts is formed into a lug part 18 risen from the face of the other film. Then a sealing means 19 is moved to seal the whole lug part 18. Sealing of mutually parallel two parts is performed in the bladelike extending part of the film 11 around the pinching roller 13. Thereafter the outsides of the sealed parts 22 of the side parts are approached close and cut because these are unnecessary as a square bottom bag.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention provides a method and apparatus for fully automatically manufacturing square-bottomed bags convenient for storage in cardboard boxes, etc. from synthetic resin film in the form of a belt-shaped cylinder. Regarding.

(Background of the Invention) Thermoplastic synthetic resins such as polyethylene and polypropylene are formed into a continuous cylindrical film (referred to as a bubble) using inflation molding technology, which is then wound into a flat cylindrical shape. It is supplied to industry as a countermeasure.

Such a belt-shaped cylindrical synthetic resin film is extremely easy to process, such as heat sealing and cutting, so it is used for various packaging materials.
is common.

The manufacturing method for the flat-bottomed bag 1 is to first linearly heat-seal the end 2 that will become the bottom, and then seal the end 2 at a fixed interval (i.e.
It's a bag. ) and cut the end 3 which is to become the opening edge.

The method of manufacturing a flat-bottomed bag from a band-shaped cylinder has the advantage that the process is simpler than that of manufacturing a bag from a sheet-like film, and there is no seam in the sacral part of the bag.

By the way, when a flat bottom bag is used to store objects in a rectangular parallelepiped case such as a cardboard box, the final shape of the bag cannot fundamentally be a rectangular parallelepiped, so it is difficult to store objects in every corner of the case. (2) If the object is heavy, the edges that cannot match the shape of the case may be torn.

Therefore, as shown in FIG. 7, there is a need for a square bottom bag 6 that can fit the object 5 into the rectangular parallelepiped case 4 in which it will be finally stored.

(Prior Art) As shown in FIG. 8, the conventional method for manufacturing a square bottom bag is as follows: ■ Prepare a flat bottom bag 1, and ■ Seal the center seal T at the bottom.
2. Manually expand the side part corresponding to the middle of The square bottom bag 10 shown in the figure was used.

(Problems to be Solved by the Invention) However, in the conventional manufacturing method, a flat-bottomed bag is first made from the raw material of the belt-shaped cylinder, then the bag is manually stretched and sealed on the sides, and the unnecessary parts are removed. The circuitous process of cutting is required, which is extremely inefficient, and the need to manually enter the inside of the bag tends to be unhygienic. The benefits cannot be taken advantage of. Furthermore, the post-processes such as stacking the products after they were completed as square-bottomed bags were inefficient.

The present invention has been made in view of the above-mentioned problems, and provides an advanced method and apparatus for manufacturing square bottom bags.The first purpose of the present invention is to fully automatically manufacture everything from the raw material to the product, thereby increasing manufacturing efficiency. It is possible to significantly improve the

The second purpose is to manufacture the bag hygienically by not allowing any equipment to come into contact with the inside of the bag.

Furthermore, the third purpose is to facilitate the handling of the products by facilitating the discharge and stacking of the products.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the method for manufacturing a square bottom bag according to the present invention basically consists of sequentially unwinding a belt-shaped cylindrical synthetic resin film and holding it between pairs of clamps. The process includes the step of clamping the edges that are to become the bottom into a flat shape using rollers, and holding the two roughly central edges of the clamped flat edges each and pulling them toward each other in a direction perpendicular to the axial direction of the clamping rollers. The synthetic resin film is fed out while being peeled off, and as a result, it expands into a roughly triangular wing shape with each holding area as its apex, and between each holding area there is an ear that is perpendicular to the axial direction of the holding roller. A process of sealing the ears to form a central seal part, and a process of forming two side seal parts parallel to each other around one clamping roller at right angles to the central seal part into a wing-shaped expanded part. The method includes the steps of: cutting off an unnecessary portion on the outside of the side seal portion; and cutting off an end portion of the synthetic resin film that is to become an opening edge by further rolling out the synthetic resin film.

Further, as shown in the claims, the method of the present invention also includes a specific method for manufacturing the -layer.

The square bottom bag manufacturing apparatus according to the present invention basically consists of a pair of clamping rollers that sequentially feed out a synthetic resin film of a band-shaped cylindrical body 1, and clamping the edge which is to become the bottom part in a flat shape; The two roughly central edges of the flattened edges are each held, and the synthetic resin film is fed out while being peeled off from each other in a direction perpendicular to the axial direction of the clamping rollers, thereby forming a roughly triangular shape with each holding area as the apex. and a first sealing means that seals the ears to form a central sealing part. and a second sealing means for forming two side seal portions parallel to each other around the clamping roller into wing-like expanded portions at right angles to the central seal portion, and an unnecessary portion outside the side seal portion. and a second cutting means that further unrolls the synthetic resin film and cuts the edge that is to become the opening edge.

Further, as shown in the claims, the apparatus of the present invention also includes a specific manufacturing apparatus for the second layer.

(Function) By carrying out the present invention, a square bottom bag can be manufactured fully automatically and efficiently from the original fabric of a belt-shaped cylinder, and the product is sanitary and easy to handle.

(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic perspective view of a square bottom bag manufacturing apparatus according to the present invention, FIG. 2 is a schematic side view, and FIGS. 3 to 5 are schematic diagrams for explaining the manufacturing process. FIG.

Thermoplastic synthetic resin such as polyethylene or polypropylene is formed into a continuous cylindrical film using inflation molding technology, and is wound up into a flat shape to prepare a band-shaped cylindrical film 11, which is used as a guide for web control. A pair of clamping rows 213 pass through the roller 12
guided by.

Here, the term ``band-shaped'' refers to the fact that the film 11 is continuous with a constant width, and the term ``cylindrical body'' refers to the so-called bubbles, which were originally continuously formed into a cylindrical shape, being folded into a flat Kfe. refers to something. Further, in order to sequentially feed out the film 11 of the belt-shaped cylinder body under constant tension and without meandering according to the steps described below, a quetsubu control device for meandering correction and centering; film 1
Although a dancer roller and a feed-out roller are required to allow some leeway in the feeding of the rollers, such means are already well known and will not be described further.

The film 11 is sandwiched between a pair of clamping rollers 13 and passed between a pair of auxiliary guide members 14 arranged in parallel close to these clamping rollers 13, and is then passed through the edge that will later become the bottom of the square bottom bag. The edges are held flat.

Next, the two substantially central edges of the pinched flat edges are first temporarily held by vacuum suction means 15 shown in FIG. 2 on their outer surfaces, and then opened slightly. The inner surface of each edge is firmly gripped by the holding claws 16 integrated with the vacuum suction means 15 in cooperation with the vacuum suction means 15. These vacuum adsorption means 1
5 and the holding claw 16 constitute an expanding means 17 for the film 11, and this expanding means 17 moves in a direction perpendicular to the axial direction of the holding roller 13. As a result, the two wires of the film 11 are completely peeled off from each other and rolled out one after another.As a result, as best shown in FIG. It expands into a feather-like shape.

The film 11 between the respective holding parts by the pair of holding claws 16 is perpendicular to the axial direction of the holding roller 13.
Furthermore, the edges 18 stand up from the other film surfaces.

Next, the first sealing means 19 shown in FIG. 1 is used to seal the thermoplastic synthetic resin film 11 by heat sealing, ultrasonic sealing, etc. as is already well known. exist. By applying pressure in this manner, the nine ears 18 are sealed by the first sealing means 19, forming a central sealing portion 20 in FIG.

Next, a pair of second sealing means 21 are provided which function at right angles to the central sealing part 20, in other words, parallel to the axial direction of the clamping roller 13.
1, two parallel seals are applied to the wing-shaped expanded portion of the film 11 with the clamping roller 13 as the center. The seal formed by the second sealing means 21 in this manner is referred to as a side seal portion 22 in FIG. 4.

After this, the outer side of the side seal part 22 held by the holding claw 16 is cut off by the first cutting means 23 which is close to and parallel to the second sealing means 21 because it is unnecessary for the square bottom bag. be done.

This first cutting means 23 is a mechanical or thermal cutter and may be integrated with the second sealing means 21. Note that the unnecessary part that was removed is removed when the holding claw 16
Since it is rotatable around , it is separated from the expanding means 17 and discharged through the chute 25.

Through the steps and methods described above, the bottom, which is the base of the square bottom bag, has been completed as shown in Figure 4, and all that is left is to adjust the film 11 to a predetermined size (this is the height of the square bottom bag). All you have to do is roll it out and finally cut off the edge that will be the opening edge of the bag.

However, the present invention includes the following steps and means in order to fully automate the production of square bottom bags efficiently.

That is, reference numeral 26 indicates a folding reference forming means, and this folding reference forming means 26 faces the holding roller 13 and moves in parallel to fold the bottom of the square bottom bag in two as shown in FIG. Form the folding standard. Specifically, the folding reference forming means 26 is a pressing blade or an air jet, and forms a fold at the center of the bottom portion facing and parallel to the holding roller 13.

As best illustrated in FIG. Close it around the fold.

The closed bottom part is held between two pairs of drawer rows 231 supported by a bracket 30 that can be raised and lowered, and then
The pull-out roller 31 and the clamping roller 13 rotate to pull out the film 11 to a predetermined size.

Finally, the second cutting means 32 cuts off the edge of the square bottom bag that should become the opening edge, and the completed round bottom bag is finally folded 91k by the pull-out roller 31, and the chute 33 and They are sequentially piled up via a conveyor 34.

(Effects of the Invention) According to the present invention, square bottom bags can be manufactured fully automatically and efficiently, and since no equipment comes into contact with the inside of the bag, it is very hygienic. This has the useful effect of allowing the product to be neatly folded and piled.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view of the square bottom bag manufacturing apparatus according to the present invention, FIG. 2 is a schematic side view, and FIGS.
The figures up to the figure are rounded schematic perspective views explaining the manufacturing process;
The figure shows a flat-bottomed bag, Fig. 7 is a perspective view showing the convenience of a square-bottomed bag, Fig. 8 shows the manufacturing process of a square-bottomed bag by conventional procurement work, and Fig. 9 shows the following: FIG. 3 is a view of the square bottom bag seen from the bottom. 6.10... Square bottom bag, 11... Film, 13
... Holding roller, 15 ... Vacuum suction means, 16 ... Holding claw, 17 ... Expanding means, 1
B...Ear portion, 19...First sealing means, 20.
...Central sealing part, 21...Second sealing means,
22.1. Side seal part, 23... first cutting means,
26... Folding standard forming means, 29... Folding roller, 31... Pull-out row 2.32... Second cutting means, 33... Chute, 34... Conveyor. Figure 1

Claims (1)

[Scope of Claims] 1. The step of sequentially feeding out the synthetic resin film of the band-shaped cylinder, and pinching the edge which is to become the bottom part into a flat shape by a pair of pinching rollers, and the pinched flat edge. The two edges at approximately the center of each are held and the synthetic resin film is fed out while being peeled off from each other in a direction perpendicular to the axial direction of the holding rollers, thereby expanding it into a roughly triangular wing shape with each holding portion as the apex. At the same time as opening, between the respective holding parts, a step of forming an ear part perpendicular to the axial direction of the holding roller, a step of sealing the ear part to form a central seal part, and a step of forming an ear part perpendicular to the central seal part. , a step of forming two side seal portions parallel to each other around the clamping roller on the wing-shaped expanded portion; and a step of cutting unnecessary portions on the outside of the side seal portion; A method for manufacturing a square bottom bag from a band-shaped cylindrical body, comprising the steps of further rolling out the film and cutting the end that should become the opening edge. 2. The process of sequentially unwinding the synthetic resin film of the band-shaped cylinder, and using a pair of clamping rollers to clamp the edges that are to become the bottom in a flat shape, and the two edges approximately in the center of the clamped flat edges. The synthetic resin film is drawn out while being peeled off from each other in a direction perpendicular to the axial direction of the holding rollers, and as a result, the synthetic resin film expands into a substantially triangular wing shape with each holding portion as the apex, and each Between the holding parts, there are a step of forming an ear part perpendicular to the axial direction of the clamping roller, a step of sealing the ear part to form a central seal part, and a process of forming a central seal part with the clamping roller perpendicular to the central seal part. a step of forming two parallel side seal portions on the wing-shaped expanded portion; a step of forming a base for folding the bottom portion at a central position facing the clamping roller; a step of closing the wing-shaped expanded portion with a roller; a step of holding the closed portion with a pair of pull-out rollers and drawing out the synthetic resin film to a predetermined size; and an opening edge. A method for manufacturing a square bottom bag from a band-shaped cylinder, comprising: cutting the desired end; 3. Sequentially unwind the synthetic resin film of the belt-shaped cylinder, and use a pair of clamping rollers to clamp the edges that should become the bottom in a flat shape, and each to hold the two roughly central edges of the clamped flat edges. , the synthetic resin films are fed out while being peeled off from each other in a direction perpendicular to the axial direction of the clamping rollers, thereby expanding into a substantially triangular wing shape with each holding area as the apex, and forming a space between each holding area. a first sealing means that seals the ear to form a central seal portion; a second sealing means for forming two side seals parallel to each other on the wing-shaped expanded portion; and a first cutting means for cutting an unnecessary portion on the outside of the side seal. An apparatus for manufacturing a square-bottomed bag from a belt-shaped cylindrical body, comprising: a second cutting means for further unrolling the synthetic resin film and cutting an end portion that is to become an opening edge. 4. Sequentially unwind the synthetic resin film of the band-shaped cylinder, and use a pair of clamping rollers to clamp the edges that should become the bottom in a flat shape, and each to hold the two roughly central edges of the clamped flat edges. , the synthetic resin films are fed out while being peeled off from each other in a direction perpendicular to the axial direction of the clamping rollers, thereby expanding into a substantially triangular wing shape with each holding area as the apex, and forming a space between each holding area. a first sealing means that seals the ear to form a central seal portion; a second sealing means for forming two side seals parallel to each other on the wing-shaped expanded portion; and a first cutting means for cutting an unnecessary portion on the outside of the side seal. a folding reference forming means for forming a reference for folding the bottom portion at a central position facing the clamping roller; a pair of folding rollers that close the wing-shaped expanded portion; An apparatus for manufacturing a square bottom bag from a belt-shaped cylindrical body, comprising: a pair of pull-out rollers that pull out a synthetic resin film to a desired size; and a second cutting means that cuts an edge that is to become an opening edge.