JPH03182331A - Method and device for manufacturing film bag - Google Patents

Abstract

PURPOSE:To manufacture plastic bags which are not bulky even in the folded state by heat melting a base of a lip of a film, forming a folding line, and then opening the lip, cutting the same into the V-shape and again folding, fusing and cutting. CONSTITUTION:A folding line (c) is formed on a base of a lip (a) of a film (b) with the lip (a) formed thereon, and a habitual folding line is formed by heating a habitual folding line forming device 5, and then placed in tension on a dancing roller mechanism 7 and transferred to an intermittent transfer device 8. The lip (a) is opened again by a lip opening device 9, and the lip (a) is cut almost into the V-shape by a cutter 11, and the lip is folded by a folding device 12 again and intermittently transferred, and then the film (b) section of the V-shaped cut section is fused in a seal cutting device 13 and simultaneously cut to manufacture bags A continuously.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a method and apparatus for manufacturing bags, especially envelopes with folded lips, from plastic films. (Prior Art) A plastic film is folded in half to form a lip on one side, and the lip is cut into a substantially V shape at predetermined intervals, and the half-folded film at the V-cut portion is then folded in half in the width direction. Forming bags from plastic film by cutting stickers is disclosed in Japanese Patent Publication No. 59-44263 and Japanese Patent Application Laid-Open No. 1999-1999.
It is known from Publication No. 133725 and the like.

[Problem to be solved by the invention]

However, polyethylene (PE), biaxially oriented polypropylene (OPP), unoriented polypropylene (CPP)
) If you make a bag by folding the bag in half or by folding the lip, the elasticity of the film will ensure that the half-folded part or the folded part of the lip will not be folded in half or folded. They are bulky and bulky, and when they are bundled together, storage and transportation become troublesome, and this tendency is particularly noticeable in bags with foldable lips. In view of these current circumstances, the present invention solves the above-mentioned defects when forming bags using elastic plastic materials, and efficiently manufactures plastic bags that do not become bulky even when the lip is folded. The object of the present invention is to provide a method and apparatus for doing so. (Means for Solving Problem 711) In order to achieve the above object, the present invention heats and forms a folding line at the base of the lip while continuously transporting a film that has been folded in half so as to form a lip on the - side. to fold the lip from the fold line, then heat the half-folded part of the film and the folded part of the lip to form a fold, and then transport the film intermittently.Open the fold of the lip and fold the opened lip. After cutting into a substantially V shape at predetermined intervals, the lip is folded again, and then the half-folded film at the cut portion of the lip is simultaneously sealed and cut in the width direction to form a bag. As a heating forming means, for example, approximately 150
C. heating etch is applied and the film is heated and melted while utilizing the conveying action of the film to form continuous folding lines. As a means for forming folds in the half-folded part of the film and the folded part of the lip, a heating block of 100 to 180° C. is applied to the half-folded part of the film and the folded part of the lip, depending on the material, thickness, etc. of the film. contact from both sides, or
Alternatively, contact may be made from the surface, or a combination of these methods may be used. The film with folds formed in the half-folded part of the film and the folded part of the lip is converted from continuous to intermittent transport using a dancer roller mechanism, etc., and the film transport action of the intermittent film transport means is used. The folded lip is opened and the lip is folded again after being cut into a V-shape, and the lip is cut into a substantially V-shape and the film is cut into a seal in the film intermittent stopping step. Further, the present invention provides an apparatus for achieving the above object, as follows:-
A continuous film transport device that continuously transports a film that has been folded in half to form a lip on the side, a folding line heating forming device that presses against the base of the lip, a lip folding device that folds the folding line, and a film folding device that folds the film in half. The dancer is provided with a fold forming device that heats the folded portion of the lip and the folded portion of the lip in sequence, and also stretches the film on the continuous film transport device.
A roller mechanism is connected to an intermittent film transport device that transports the film intermittently, and the intermittent film transport device includes a lip opening device that opens the folded lip, and a lip opening device that opens the folded lip. A detection device that detects the detection, a cutting device that moves in the width direction of the film in conjunction with the detection device and cuts the lip into a shape when the film is stopped intermittently, and a lip folding device that folds the cut lip onto the film again. The device is provided with a seal cutting device that welds and cuts the film in the width direction at the V-shaped cut portion of the lip when the film is stopped intermittently. The folding line heating forming device is configured such that a heating block having an etch in which a heater is enclosed can be moved in a direction according to the width of the lip. The lip folding device is composed of an idler roller that presses the overlapping portion of the half-folded film and a folding bar that folds the lip. The folding forming device is provided with a heating block having a heater in pressure contact with the surface of the half-folded portion of the film conveyed on the transfer roller and the folded portion of the lip, and can be freely adjusted left and right, or a heating block is installed on the surface of the half-folded portion of the film and the folded portion of the lip. The folding part and the lip can be provided in contact with each other from both sides, or both of these methods can be used in combination. The dancer roller mechanism for stretching the film provided between the continuous film transport device and the intermittent film transport device automatically transfers the film continuously transported by the continuous film transport device to IOI intermittent transport by the intermittent film transport device. This allows for conversion and migration to . The device for opening the folded lip consists of two idler rollers installed in the longitudinal direction at the ends of two arm rods whose intersecting angle can be adjusted.
A suppression roller is provided inside the advance/retreat side WJ which is pivotally supported within the 14th section and presses the half-folded overlapping portion of the film on the base pivoting portions of the two arm rods, and adjusts the angle of the arm rods and the position of the idler roller. This makes it possible to adapt to the hardness and softness of the film material, thickness, lip width, etc. The cutting device includes a cutter receiving plate having a triangular through hole that supports the lip portion of the film, and a triangular cutter receiving plate that descends to clamp the lip portion of the film when the film is stopped intermittently and overlaps with the through hole of the cutter receiving plate. This cutting device is composed of a presser plate having a through hole in the shape of a shape, and a cutter having a roughly V-shaped cross section that moves up and down inside the overlapping through hole and the through hole, and this cutting device detects the edge of a lip installed at the front of the cutting device. It is configured so that it can automatically move in the width direction of the lip in conjunction with a detection device to cut a substantially V-shape at a certain position from the edge of the lip. The lip folding device is configured to fold the opened lip onto the film again using the film transporting action of the intermittent transporting device using a twisted guide bar. Further, the seal cutting device operates when the film is stopped intermittently using a conventional sealing roller and a sealing cutter to simultaneously seal and cut the V-shaped cut portion in the width direction of the film.

[Function] The method of the present invention heats and melts the base of the lip of a continuously transported half-folded film to form folding lines for easy folding, and then heats the half-folded part of the film and the folded part of the lip. By folding and folding, the half-folded part and the lip part of an elastic film such as a plastic film are tightly and thinly overlapped to eliminate the bulk, and then this is transferred intermittently and once it is folded. The bag is manufactured by opening the bag into a substantially V-shape, folding the lip again, and then welding and cutting the half-folded film at the V-shaped cut portion in the width direction to fold the lip. In addition, the apparatus of the present invention sequentially includes a lip folding line heating forming device, a lip folding device, and a folding device for forming the half-folded portion of the film and the lip folded portion in a continuous transfer device for the film folded in half to form a lip. While continuously transporting the elastic film, the half-folded part and the folded lip part are automatically and reliably folded into a thin overlapping state.Then, this is automatically transferred to the film intermittent transporting device using a dancer roller mechanism. a lip opening device that is sequentially installed in the film intermittent transfer device, a detection device that detects the edge of the opened lip, a cutting device that cuts the lip into a substantially V shape that is interlocked with the detection device, and a lip opening device that This system automatically and continuously manufactures bags such as envelopes with folded lips by using an intermittent transfer action and an intermittent stop action using a folding device for refolding the film and a seal cutting device for the film at the V-shaped cut portion. be. [Example] To explain the method and apparatus of the present invention with reference to an example, a continuous film transporting device 2 consisting of a roller 1, etc. 1 is used to form a lip a on one side using a known half-folding device (not shown). The continuous film transporting device 2 is configured to continuously transport the half-folded film b, and the film continuous transporting device 2 includes a folding line heating forming device 3 that forms a folding line C at the base of the lip a, and a folding line heating forming device 3 that forms a folding line C at the base of the lip a. Lip folding device that folds from the film b to the half-folded overlapping part v! 14, and a crease forming device 5 which creases the half-folded portion of the film b and the folded portion of the lip a by heating are provided sequentially toward the rear. The folding wire heating forming device 3 is provided with a heating block 31 having an etch in which a heater is enclosed, which is movable and adjustable in the axial direction of the roller 1 via an arm rod 32 and a support shaft 33, Adjust the etch position accordingly and adjust the roller 1 according to the material and thickness of film b.
It is configured such that the pressure contact force against the film can be adjusted by a spring 34, and the base of the lip a of the film b that is continuously transferred by etching is heated and melted to form a continuous fold line C.
form. Moreover, the lip folding device 4 is the film continuous transport device! ! an axially adjustable suppression roller 4 that presses the half-folded overlapping portion of the filter tsb between the two rollers 1;
1 and a folding bar 42 that guides the lip a, and while pressing the half-folded overlapping part of the film b, on which the folding line C is formed, with a suppression roller 41, the standing lip a is collapsed with the folding bar 42. The film is formed so as to be folded from the folding line C onto the overlapping portion of the film. Furthermore, the fold forming device 5 applies the following to the surfaces of the half-folded portion of the film b and the folded portion of the lip a on the roller 1.
In the case where the heating blocks 52, 52 which are adjustable in the width direction of the film b are pressed together with the adjustable springs 53 through the support 51 to form a crease, and the half-folded part of the film b between the rollers 1 and the lip a. Film B on both sides of the folded part of
There are cases in which heating blocks 54, 54 which can be adjusted in the width direction of the film are provided and brought into contact with each other from both sides to form a crease. It is configured to fold twice using the bending and stretching action of the roller l in b, and the heating temperature of the heating blocks 52 and 54 varies depending on the material, thickness, and number of heating times of the film. However, in the case of surface heating, it is usually around 150℃, and in the case of both sides heating, it is about 12℃.
Heat at around 0°C. Therefore, the film b is fed to the continuous film transport device 2 after being folded in half to form the lip a. First, fold 1 at the base of lip a using folding line heating forming device 3.
1Ac is formed, the lip a is folded in a lip folding device, and then the half-folded portion of the film b and the folded portion of the lip are folded by heating in the crease forming device i5, and then the film b is processed. An intermittent film transfer device that passes between pressure rollers 6, 6, lower rolls 71, 71, 71, etc. is stretched open on a dancer roller mechanism 7 supported by a spring 72, and is driven by an intermittent drive roller 81. Lol! t8
and is converted into an intermittent transport action. The film intermittent transfer device 8 includes a lip opening device t9 that reopens the folded lip a, a detection device 10 that detects the edge of the lip a opened by the lip opening device 9, and a detection device 10 that is connected to the detection device 10. A cutting device 11 moves in the width direction of the film to cut the lip a into an asV shape, and a lip folding device w consists of a twisted bar to fold the open lip a again.
! 112 and a seal cutting device 13 for welding and cutting the film at the V-shaped cut portion of the lip in the width direction are provided in this order. Thus, the lip opening device 9 has two arm rods 91, 91 whose intersecting angles can be adjusted, one of which is fixed in an upright position and the other approximately horizontally. Idler rollers 93, 93 through long holes 92, 92
A suppression roller 94 is provided at the base of the arm rods 91, 91 so that it can be adjusted forward and backward in the width direction via a long groove 95, and the film b with the folded lip a is placed on the top of the idler roller 93. By opening the lip a through the lower part of the pressure roller 94 and applying tension to the lower part of the idler roller 93, the lip a is opened horizontally again. The intersecting angle of the arm rods 91, 91 and the position of the idler rollers 93, 93 relative to the long holes 92, 92 are adjusted depending on the material, thickness, lip width, etc. of the film. Further, the cutting die W111 includes a cutter receiving plate 1 having a triangular through hole 111 that supports the shoe 18 portion of the film b.
12 and a triangular through hole 113 that overlaps with the through hole 111, and a holding plate 115 that descends by the action of the cylinder 114 to restrain the 9718 portion of the film b when the film b is stopped intermittently, and the through hole 111. 113 inside cylinder 1
When the intermittently transferred film b is transferred onto the cutter receiving plate 112 and stopped, the cylinder 114 is activated and the presser plate 115 is lowered. The cutting blade 117 is lowered by the cylinder 116 with the 9718 portion of the film b being sandwiched between the cutter receiving plate 112 and the holding plate 115 to cut the lip a into a substantially V shape. Therefore, the film b obtained by folding the lip a, which is intermittently transferred by the intermittent transfer device [8, is folded into a lip opening v! At t9, the lip a is transferred again in an open state, and the position of the edge thereof is detected by the detection device 10, and the position of the edge is detected by the cutting device. ? Adjust the position of film b so that it is at a predetermined position from the edge of lip a.
At the time of intermittent stop, the lip a is cut into a substantially V shape by the cutting device 11, and then the lip a is folded again by a lip folding device consisting of a guide bar with a twisted guide bar. and sealing cutter 1
Seal-cut group consisting of 32 sheets [113] During intermittently stopped, the film 6 portion of the V-shaped cut portion is welded and cut at the same time to continuously manufacture the bag A in which the bag-shaped lip a is folded. Effects of the Invention 1 The present invention provides a method for producing bags by folding an elastic film in half to form a lip on one side, continuously transporting the film, welding the film at predetermined intervals in the transport direction, and cutting the film at the same time. , the elastic film can be folded in half and the lip can be folded by heating and forming a folding line on the lip part in advance and then heating the half-folding part of the film and the folding part of the lip to form folds. It is possible to maintain the shape as tightly and thinly as possible, and in particular, even bags with folded lips can be manufactured continuously and efficiently into thin flat shapes without bulking up. Therefore, even when these bags are piled up It has excellent features such as being able to be reliably and compactly bundled, and being extremely easy to store, transport, and handle. Furthermore, the device of the present invention can automatically and continuously manufacture bags with a lip folded in half from an elastic film so as to have a lip on one side into a thin flat shape that does not take up much bulk, and furthermore, the bag can be folded in half so as to have a lip on one side. A heating forming device, a lip folding device, a folding device that heats the half-folded portion of the film and the folded portion of the lip are installed in a continuous film transfer device to continuously carry out the heating, and a device for cutting the lip into an approximately V-shape and the width of the film. A seal cutting device in the direction is provided in the intermittent film transfer device to accurately cut the lip III at a predetermined position and seal cut the film, and by connecting these devices with a dancer roller mechanism, each device can while fully demonstrating its functions. It has an excellent feature of being able to produce thin, flat bags without bulk from a half-folded film in a continuous, efficient and smooth manner with the lip folded.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention, FIGS. 2 and 3 are front views of the same essential parts, and FIG. 4 is a perspective view of the same essential parts. 2... Film continuous transport device, 3... Folding line heating forming device, 4... Lip folding device, 5... Folding forming mold fi, 6... Pressure roller 7... Dancer
Roller mechanism, 8... Intermittent transfer device, 9... Lip opening device, 10... Detection device, 11... Cutting device,
Process 2...Lip folding device, 13...Seal cutting device. a...Lip, b...film, C...folding line.

Claims (1)

[Claims] 1. While continuously transporting a film that has been folded in half so as to form a lip on one side, a folding line is formed at the base of the lip by heating and the lip is folded from the folding line, and then the film is folded in half to form a lip on one side. After heating the half-folded part and the folded part of the lip to form a fold, the film is intermittently transferred, the folded lip is opened, and the opened lip is cut into a substantially V shape at predetermined intervals, and then again. 1. A method for manufacturing a film bag, comprising folding a lip, and then simultaneously seal-cutting the half-folded film in the width direction at the cut portion of the lip to form a bag. 2. A continuous film transport device that continuously transports a film folded in half so as to form a lip on one side, a folding line heating forming device that presses against the base of the lip, a lip folding device that folds the folding line, and a half of the film. A fold forming device that heats the folding portion and the folded portion of the lip is sequentially provided, and a dancer roller mechanism that stretches the film is connected to the continuous film transfer device, and is connected to an intermittent film transfer device that transfers the film intermittently. The film intermittent transfer device includes a lip opening device that opens the folded lip, a detection device that detects the edge of the opened lip, and a detection device that moves in the width direction of the film in conjunction with the detection device to open the film. A cutting device that cuts the lip into a substantially V-shape when the film is stopped intermittently, a lip folding device that folds the cut lip onto the film again, and a film welded in the width direction at the V-shaped cut portion of the lip when the film is stopped intermittently. A film bag manufacturing device characterized in that a film bag manufacturing device is provided with a seal cutting device that sequentially cuts the film bag.