JPH03182328A - Folded section shape retaining device for film bag manufacturing machine - Google Patents

Abstract

PURPOSE:To retain the shapes of a half-folded elastic film and a folded section of a lip adhered together thinly and securely at the time of forming a bag by performing folding, forming a folding line by use of a folding device, heating the folded section by use of folding inclination forming device to form folding inclination and pressurizing the same by use of a film pressurizing roller. CONSTITUTION:A film (b), half-folded and fed into a film continuous transfer device 2 in a manner of forming a lip, and first a folding line is melt formed by a folding line heat forming device 3 on a base of the lip, and then a lip (a) is folded by a lip folding device 4 and then a half-folded section of the film (b) and a folded section of the lip are heated by a folding inclination forming device 5 to form folding inclination. Then, the half-folded section of the film (b) and the folded section of lip (a) are inclination folded by heading a folding inclination forming device 5, and then the film (b) passes through between pressure rollers 6.6 to fold the half-folded section of the film (b) and the folded section of lip (a) securely.

Description

[Detailed description of the invention]

[Field of application on g-beams] The present invention is a film bag manufacturing machine that continuously manufactures bags such as ``MfrIJ'' using an elastic film, in which the half-folded part of the film and the folded part of the lip are reliably bent. The present invention relates to a bent portion shape retaining device.

[Conventional technology]

Fold the plastic film in half to form a lip on one side, cut the lip into a roughly V-shape at predetermined intervals, and seal-cut the half-folded film in the width direction at the ■-shaped cut portion to make a plastic film. Forming a bag from a film is known from JP-A-59-44263 and JP-A-1-133725. [Problems to be Solved by the Invention] However, polyethylene (PE), biaxially oriented When a bag is manufactured by folding an elastic plastic film such as polypropylene (OPP) or i-stretched polypropylene (CPP) in half or folding the lip, the elasticity of the film causes the half-folded part or the folded part of the lip to If the bags are not folded in half or folded securely, they become bulky and bulky, and when they are bundled together, storage and transportation become troublesome, and this tendency is especially noticeable with bags whose lips can also be folded. In view of these current circumstances, the present invention provides a method for reliably and closely forming the half-folded portion of the film and the folded portion of the lip when forming a bag using the above-mentioned elastic plastic bag. It is an object of the present invention to provide a shape retaining device for a folded portion that prevents the bag from becoming bulky due to folding. [Means for solving alM] The present invention achieves the above object. For this purpose, a continuous transport device for a film that is folded in half to form a lip on the − side includes a creasing line heating forming device for melting and forming a folding line on the lip portion, and a folding device for folding the folding line. and a folding forming device that heats the half-folded portion of the film and the folded portion of the lip, and a film pressure roll are sequentially provided.The folding line heating forming device includes a heater that is temperature adjustable. The etch of the heating block is brought into contact with the base of the lip and the fold line is heated and melted using the transfer action of the lip, and the position in the width direction of the film depends on the bag being manufactured, the width of the lip, etc. The folding device is configured so that its movement can be adjusted and the pressing force against the film can be adjusted using a spring according to the material and thickness of the film.The folding device also has a structure in which the folding device is configured to move in an axial direction that presses the half-folded overlapping portion of the film between the film transport rolls. It consists of an adjustable idler roller and a folding bar consisting of an inclined upright part provided on the lip side and a horizontal part connected to this.
The lip of the half-folded film, which has been pressed and sent out by a pressure roll, is pressed diagonally while the lip is folded from the folding line onto the half-folded overlapping portion of the film. Furthermore, the fold forming device places a heating block containing an adjustable heater at a position in the width direction of the film on the surface of the half-folded portion and the folded lip portion of the film that is conveyed on the transfer roller of the continuous film transfer device. In some cases, the heating block is provided so that the pressure contact force can be adjusted, and in other cases, the heating block is provided so that it can contact the half-folded portion of the film and the folded lip from both sides, and if necessary, both are used together. You can also do that. (Function 1) In the present invention, a film is folded in half so as to form a lip on one side and is continuously conveyed in a film continuous device. After the lip is bent from the folding line at Avt and folded onto the half-folded film, the half-folded part of the film and the folded part of the lip are heated and folded by a folding device. The film is crimped, and the film half-folded portion and lip folded portion are reliably bent using a film pressure roller. [Example 1] To explain the present invention with reference to the drawings of the embodiment, the film is rolled. The film continuous transport device 2 is configured to continuously transport a film b that has been folded in half to form a lip a on one side using a known half-folding device (not shown), and is capable of continuously transporting the film. The device!12 includes a folding line heating forming device for forming a folding line C at the base of the lip a.
3, and a lip folding device that folds the lip a from the folding line to the half-fold overlapping part of the film b! 4, and the film b
A fold forming device 5 for forming folds by heating on the half-folded portion of the lip a and the folded portion of the lip a are sequentially provided toward the rear. The folding wire heating and forming device W13 includes a heating block 33 having an edge 32 in which a heater 31 that can adjust the temperature is enclosed, and the position of the heating block 33 in the axial direction of the roller 1 and the pressing force against the roller 1 can be adjusted. The adjustment device W134 supports the arm rod 35 supporting the heating block 33 via the support frame 36 on the support shafts 38, which are movable in the axial direction of the roller 1 with the adjustment handle 37. The position of the edge 32 is adjusted by moving the support shafts 38 in accordance with the width of the lip a, and the pressing force against the roller l is applied by a spring 39 provided in the support frame 36 in accordance with the material and thickness of the film b. The base of the lip a of the film b, which is adjustable and continuously transported by the edge 32, is heated and melted to form a continuous fold line 0. Also said lip folding device! Reference numeral 4 denotes a suppression roller 42 provided on an adjustment rod 41 that can suppress the half-folded overlapping portion of the film b between the rollers 1 of the continuous film transport device 2 and that can be adjusted in the axial direction, and a suppression roller 42 that is freely attached to the adjustment rod 41. The folding bar 43 is composed of a diagonal upright part and a horizontal part that guide the folded lip a, and the folding bar 43 is folded up while pressing the half-folded overlapping part of the film b formed with the folding line C with a pressing roller 42. The shaped lip a is gradually brought down by a folding bar 43, and the film is folded from a folding line C onto the overlapping film. Further, the foldable bag Ft5 has heating blocks 52, 52 pivotally supported via a support frame 53 on a support shaft 51 that is adjustable in the width direction of the film b, and the support frame 53 is pressed by an adjustable spring 54. A pair of heating blocks 52, 52
The half-folded part of the film b on the roller 1 and the lip a
When applying pressure to the surface of the folded part of the film b to form a crease, heating blocks 55, 55 adjustable in the width direction of the film b are provided on both sides of the half-folded part of the film b between the rollers 1 and the folded part of the lip a. In some cases, the film b is placed in contact with both sides to form a fold, and the drawings of the embodiment show a case in which these methods are used together. The film is constructed to be folded at two points, and the heating temperature of the heating blocks 52 and 55 is adjusted by adjusting the temperature of an adjustable heater sealed inside, depending on the film material, thickness, and number of heating units. , approximately 1 for normal surface heating
Heat at around 50°C, or around 5111120°C in the case of heating on both sides. Therefore, film continuous transfer bag v! Film b is supplied after being folded in half to form lip a at L2. First, the folding line heating forming device 3 melts and forms the folded Mc on the base of the lip a, and then the lip a is folded in the lip folding device 4, and then the half-folded portion of the film b and the lip a are formed.
After the folded portion of the film b is folded by heating by the fold forming device 5, the film b passes between the film pressure rollers 6 and 6 to ensure that the half-folded portion of the film b and the lip a folded portion are folded. be bent. The film b bent in this way is moved to the lower rollers 71 and 7.
1,71... are suspended by the dancer roller mechanism 7 supported by the springs 72, and transferred to the film intermittent transfer device f28 driven by the intermittent drive roller 81, where the film is converted into an intermittent transfer action. The film intermittent transfer device 8 includes a lip opening device 9 for reopening the folded lip a, and a lip opening device!
! A detection device 1-10 detects the edge of lip a opened by 9, a cutting device 11 moves in the width direction of the film in conjunction with the detection device ft1o, and cuts the lip a into a substantially V-shape, and twisting. A lip folding device 12 for refolding the opened lip a consisting of a shaped bar 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 sequence, and the intermittent transfer device The film b with the folded lip a, which is intermittently transported at 8, is transported again with the lip a opened by the lip opening device 9, and the position of the edge thereof is detected by the detection device ↓O, and the film b is transferred to the cutting device 11. It consists of a guide bar whose position is moved and adjusted from the edge of lip a to a predetermined position, and when film b is stopped intermittently, lip a is cut into a substantially V shape by cutting device 11, and then lip a is twisted again. The lip folding device 12 folds the film and transfers the film intermittently, and the seal cutting device 13, which includes a conventionally known sealing roller 131 and a sealing cutter 132, welds and cuts the film 6 at the V-shaped cut portion at the same time when the film is stopped intermittently. Bags A with folded lips A are continuously produced. (Effect of the invention 1) The present invention is a film bag in which an elastic film is folded in half to form a lip on one side, continuously transported, welded at predetermined intervals in the transport direction, and cut at the same time to produce a bag. In this production machine, a continuous conveyance device for half-folded film is equipped with a folding heating forming device that heats and melts a folding line at the lip portion to shape the folding line, and the folding line is folded by the folding device to fold the film. As the film is folded, the half-folded part of the film and the folded part of the lip are heated with a folding forming device to form folds, and then pressurized with a film pressure roll. The folding and folding of the lip can be done as closely as possible, as thinly as possible, and the shape can be maintained reliably, and in particular, the folding of the bag in which the lip is folded can be done continuously and efficiently in a thin, flat-shouldered shape without being bulky. In addition, it can be easily adapted to the size of the bag and the width of the lip.Therefore, folding the film in half and forming the lip in the molding hole of an elastic film bag can be done smoothly, easily and continuously. It has excellent features that allow it to be carried out efficiently.

[Brief explanation of drawings]

Fig. 1 is a perspective view of an embodiment of the present invention, Fig. 2 is a front view of the folding line side thermoforming device, Fig. 3 is a side view of the same, Fig. 4 is a front view of the folding device, and Fig. 5 is the same. A side view, FIG. 6 is a front view of the fold forming device, and FIG. 7 is a side view of the same. 2... Film continuous transfer device, 3... Folding line side thermoforming device, 4... Folding device, 5... Fold forming device, 6... Film pressure roller, a.°° Clip B...Film, C...Folding line.

Claims (1)

[Claims] 1. A continuous conveyance device for a film folded in half to form a lip on one side, a folding line heating forming device for melting and forming a folding line on the lip portion, and a folding line heating forming device for folding the folding line. A folding part shape retaining device for a film bag manufacturing machine, characterized in that a folding device for heating the half-folded portion of the film and a folded portion of the lip, and a film pressure roll are sequentially provided. 2. The folded portion shape retaining device for a film manufacturing machine according to claim 1, wherein the fold line heating forming device and the fold forming device are provided movably and adjustable in the width direction of the film. 3. The folded portion shape retaining device for a film bag manufacturing machine according to claim 1, wherein the fold forming device is brought into pressure contact with the surface of the film. 4. A folded portion shape retaining device for a film bag manufacturing machine in which a fold forming device is pressed against both ends of the film.