JPH0332827A - Wound film and preparation thereof - Google Patents

Abstract

PURPOSE:To obtain a dense winding way to which equal tension is applied by welding resin zipper pawls to the central part of a film in the lateral direction along the longitudinal direction so as to keep an interval twice a necessary length outside the zipper pawls after bag making and winding the film in a meandering state. CONSTITUTION:Female and male resin zippers 3, 4 being occluding jigs are respectively continuously welded to the central part of a film 1 in the lateral direction thereof along the longitudinal direction so as to keep an interval twice a necessary length outside the zipper pawls after bag making. When the film 1 is folded as shown by an arrow, the female pawl 4 is externally fitted to the male pawl 3. As a result, the center line A of the film 1 forms the upper edge line of a bag outside a zipper. An external lead wire 6 is provided outside the internal lead wire 5 provided outside the male pawl 3 in parallel to said lead wire 5. A winder 14 has a plurality of wheels 21 reciprocally moving on rails 20 at the lower end thereof and a shaft 22 is rotated to take up the film 1 and a main body repeats reciprocating motion to take up the film in a meandering state.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wound film in which a resin zipper claw of an articulator is wound in advance with uniform tension over the entire film, and a method for manufacturing the same. . According to the present invention, by partially modifying a conventional automatic bag-forming-filling machine, automatic bag-forming-filling can be performed at a speed equivalent to the conventional filling speed without requiring special skill.

[Prior Art] Conventionally, as shown in Japanese Patent Publication No. 45-35191, a method for manufacturing a film with a zipper claw involves joining a male claw die and a female claw die having a male or female water outlet on the outside. The film is fixed in the width direction of the film moving along the roll, and the molten synthetic resin is extruded from the male and female nails to extrude and form the male and female nails. It is known to produce zipper-claw films that are fused in parallel.

The film with zipper claws obtained by the above method is folded in two in the width direction, and with the male and female claws partially engaged, By cutting, each bag becomes an independent bag with a zipper.After the contents are loaded into the zipper bag, the opening is fused and sealed.

In addition, in Japanese Patent Publication No. 48-11981, there are two
After supplying the folded zipper claw film, and inserting the contents, only part of the zipper claws are engaged, and after the horizontal welding and cutting, the zipper claws are held again and the upper part is fused. Disclosed is a method for performing the dressing.

[Problems to be Solved by the Invention] However, since the above-mentioned film is provided with a male claw and a female claw, it has a markedly thick part, so when it is wound up, it bulges out in an irregular manner and becomes bulky, making it difficult to maintain uniform tension. is not obtained. Further, even if the zipper is wound with force, the thick part of the zipper claw is narrow, so the thick part tends to slip off and the roll collapses.

That is, it has been impossible to wind the material with uniform tension so that it can be supplied to a highly efficient bag making machine or an automatic bag making and filling machine.

Therefore, in reality, low-efficiency bag-making machines have been used that are used in a loosely wound state, or are premised on supplying bulky, loosely wound, and unstable zipper-claw films.

Winding enough to be supplied to an automatic bag-forming-filling machine requires a constant tension and a certain amount to be unwound accurately, so a constant tension is always maintained in the longitudinal direction of the film, making it easy to rotate and balance the rolled film as a whole. It is necessary that the Therefore, there has been a need for a wound film for zippered bags that can be stably wound with uniform tension so that it can be supplied to an automatic bag making and filling machine.

[Means for Solving the Problems] The present invention aims to solve the above-mentioned problems, and has a structure that includes a film wound around a core, and a center portion in the width direction of the film that is interlocked along the longitudinal direction. Female and male resin zipper claws are successively fused to each other while maintaining an interval twice the required length to the outside of the zipper claw after bag making,
In addition, the film is wound around the core in a meandering manner.

The film used in the present invention is a single-layer film, as long as the surface to which the articulating tool consisting of the male claw and female claw is fused has a fusion property with the molten synthetic resin extruded from the male claw and female claw. However, a laminated product may also be used. However, in order to take advantage of the sealing properties of articulating devices, it is necessary to use films that are easily heat-sealable, such as low-density polyethylene, low-polymerized polypropylene, and ethylene-vinyl acetate copolymers, as well as air-tight nylon and polychloride films. Laminated products with films such as vinylidene and polyester are preferred. Alternatively, a laminated product of these and other materials such as metal foil such as aluminum foil or paper may also be used.

When making a bag, the wound film of the present invention is made so that the center part in the width direction becomes the upper part of the bag, and the side parts and bottom parts are fused. The spacing between the male and female claws is such that when the male and female claws of the zipper are engaged and the bag is made, there is still enough film length for one opening and repeated opening and closing of the zipper towards the outside of the engaged zipper claw. It is. In other words, the positions of the male and female claws were set from the center line in the length direction of the film toward both edge lines to ensure the clearance width at the top required for opening and closing the zipper and the opening width to safely open the zipper at the predetermined position. Any location is fine. In reality, the distance between male and female zipper claws is 60m.
The range is from m to about 90 mm.

For the opening part, at least one thick part, preferably two parallel thick parts with a gap that allows thin tear-opening, is placed on the outside after making the bag with a lot of water, that is, in the part that should be the cutting opening part. It is preferable to provide a lead wire. Furthermore, when making bags, if there is a cutting initiation means such as a V notch or ■ notch on the outside of the lead wire after the bag is made, or in the middle of two lead wires, the bag can be opened by hand and the torn line can be prevented. Guided parallel to the articulator. Furthermore, when opening and closing the zipper after opening, the edges of the film are thicker, giving a sense of stability and improving the comfort of use. The lead wire can be easily manufactured by simultaneously extruding resin and fusing the zipper tabs together. The lead wire may be provided on the outside of either the male or female claws, or may be provided on the outside of each of the male and female claws.

The synthetic resin constituting the male and female claws and lead wires may be the same material as the film on the surface of the film to which the male and female claws and lead wires are fused, or may be a different material, and has elasticity and is compatible with the inner surface of the film. Although they fuse well, similar materials are generally used.

The shape of the male claw and female claw for a zipper as an articulating tool may be any shape as long as the protrusion of the male claw can be tightly engaged with the recess of the female claw, and this engagement and release can be repeated. .

The present invention is characterized in that the film is wound in a meandering manner around the core. If you wind the film with the edge lines aligned like normal rolled film, there will be extremely thick parts, so
Unable to wind with uniform tension. Therefore, it is wound obliquely to the winding core. The degree of this inclination should be such that the zipper tab does not overlap with the zipper tab when it was previously wound. Since the film is wound obliquely to the core in this manner, the winding portion of the core must be longer than the width of the film. As the film is wound diagonally with a slight shift, the film edge line comes into contact with one end of the winding portion of the winding core. At this point, the direction of inclination is reversed and the wire is wound in the other direction. By repeating this operation, a film whose winding direction is reversed at equal intervals, that is, a film which is wound in a meandering manner around the core can be obtained.

When supplying the wound film according to the present invention to an automatic bag-forming-filling machine, it is folded in half in the width direction after being unwound, and the male and female zipper claws are securely fitted. After that, according to the usual method, both end edges are vertically fused to form a cylindrical shape, horizontally fused and cut.
By repeating filling, bag making, filling, and sealing are performed continuously. Furthermore, it is preferable that the film unwinding machine has a mechanism that reciprocates in the axial direction in accordance with the meandering interval of the film.

The present invention can be used even when it becomes necessary to fuse zipper tabs to films of different widths due to variations in bag size.
Since there is no need to change the interval between extrusion dies and the extrusion die can be used as is, the machine adjustment period is omitted and the actual working time of the machine can be extended. In addition, in the case of a thin film, the edge portions were folded and care had to be taken to prevent the edge portions from being rolled up, but such consideration is no longer necessary.

[Effect]

The film according to the present invention can be used as a male and female zipper as an articulating tool.
The nails are directly fused to the film.

Due to the provision of zipper claws, extremely thick parts occur locally, but when winding the film around the core, the thick parts of the film that contact each other are wound at an angle so that they do not overlap, and the film is wound at a constant interval. By reversing the film, that is, winding it in a meandering manner, it is possible to tightly wind the film with uniform tension applied to the entire film.

Although some strain is applied to the film by winding it in a meandering manner around the core, it has been found that this strain is absorbed by the elasticity of the film itself and does not pose a problem in reality.

〔Example〕

FIG. 1 is a side view of the present invention, and FIG. 2 is an enlarged sectional view of the central portion of the film.

1 is 20μ thick nylon and 30μ thick polyethylene, 2
It is a 3N laminated film with a width of 600 mm made by laminating ethylene-vinyl acetate copolymers with a thickness of 0 μm, and a zipper claw is provided on the inner surface, and the zipper claw is shown in detail in FIG. 2. 2 was a paper tube with a nominal diameter of 3 inches, and was wound only in the center, leaving unwound portions at both ends. 3 is a male nail, and 4 is a female nail that engages with the male nail 3, and each was fused at a position 30 mm from the center line A in the width direction. Since the meandering width was 60 mm, the length of the winding portion was 660 mm.

When the film 1 is folded as shown by the arrow in FIG. 2, the female claw 4 is fitted from the position shown by the imaginary line.

As a result, centerline A forms the top edge line of the zipper-outside bag. 5 is an internal lead wire provided outside the male claw 3, and 6 is an external lead wire provided outside the internal lead wire 5 in parallel therewith. Because the film with such a thick part was wound in a meandering manner, the thick parts of the male and female zipper claws were raised in a layered manner in the center as shown in Figure 1, but the tension was not uniform in the center. Because it was wound, it was well balanced and could be unwound at a constant speed.

Next, a method for manufacturing the wound film of the present invention will be explained. FIG. 3 is an explanatory diagram showing a method according to an embodiment of the present invention, FIG. 4 is a view taken along the line ■ in FIG. 3, and FIG. 5 is a view taken along the line V in FIG.

10 is the original roll of film 1, and the original roll support stand 1
1 is rotatably supported. The film 1 pulled out from the original fabric roll 10 is moved from the guide roll 12a to the 12
It is sent to the joining roll 13 via the joining roll 13, passes from the upper part to the lower part of the joining roll 13 so as to be wound around the joining roll 13, and then is sent to the winding machine 14 via the guide rolls 12d to 12f.
It is wound up.

A male claw 3-7 and a female claw die 8 for extruding the male claw 3 and female claw 4 onto the film 1 that moves while being wrapped around the surface of the joining roll 13 in close proximity to the raw roll 10 side of the joining roll 13. are arranged in the axial direction of the joining roll 13. As shown in FIG. 4, the male claw 3-7 and the female claw die 8 are each oriented at a distance of 60 mm from the center of the film 1 that is moving so as to be wrapped around the bonding roll 13. The male claw 3-7 and the female claw die 8 each have a discharge port for the male claw and a female claw, and further have a discharge port for the lead wire inside thereof (on the center line side of the film 1).

This lead wire outlet (omitted in FIG. 4) is for extruding two lead wires into the center of the film from the zipper tab.

The male claw 3-7 and the female claw die 8 are each attached to the joining roll 1.
The die holder 15 is attached to a die holder 15 that is movable in the axial direction of the die. One end of a flexible hose 16 is connected to both die holders 15. The flexible hose 16 transports the molten synthetic resin from the distribution device 17 to the male and female claw outlets. An extruder is connected to the distribution device 17, and the molten synthetic resin extruded from the extruder is supplied to the male claw 3-7 and the female claw die 8 via the flexible hose 16.

Returning to FIG. 3 again, the joining roll 13 is rotationally driven to guide the movement of the film 1 and to fuse the film 1 with the male claw 3, female claw 4 and lead wire 5.6 to be extruded. In order to improve the bonding condition, the joining roll 13
The film 1 can be preheated. This preheating may be performed in the entire width direction of the film 1, but
At a minimum, it is sufficient to perform this on the portion of the film 1 where the male claw 3, female claw 4, and lead wire 5.6 are to be fused.

A water nozzle 18 for spraying cooling water onto the molten synthetic resin extruded from the male claw 3-7 and female claw die 8 is provided toward the joining roll 13 slightly below the male claw 3-7 and female claw 8 die. It is being Male claw and female claw die 7
．． The molten synthetic resin extruded from the water nozzle 18 is cooled by cooling water from the water nozzle 18, and the male claw 3, the female claw 4, and the lead wire 5
．． 6 and was fused and oriented on film 1.

On the opposite side of the water nozzle 18 across the joining roll 8, an air nozzle 19 for blowing away the cooling water from the top of the film 1 is provided diagonally downward in the substantially tangential direction of the joining roll 13. Therefore, the film 1 is wound up by the winding machine 14 with the attached cooling water removed.

As shown in FIG. 5, the winder 14 has a plurality of wheels 21 at its lower end that reciprocate on a rail 20.

The shaft 22 extending from the main body rotates to wind the film 1, and since the main body repeats reciprocating motion, the film can be wound in a meandering manner.

The film 1 provided with the male claw 3, the female claw 4, and the lead wire 5.6 is wound with a slight inclination from one end of the winding portion of the paper tube 2 toward the other end, so that the edge line of the film 1 is The winding is performed using a meandering winding method in which the direction of inclination is reversed at the part that contacts the other end of the winding part, and the winding is repeated at a slight inclination toward one end of the winding part.

The thus obtained rolled film with a hook had a length of 500 m and a winding diameter of 400 mm. - On the other hand, if the normal winding method without meandering was used, the same film of the same length would reach a winding diameter of 700 mm, and the winding would easily collapse and the tension would be uneven, making it impossible to unwind at a constant speed. .

To produce zipper packaging from the zippered film obtained as described above, the zippered film was pulled out, folded in half in the width direction, and the male and female claws were engaged. Next, both ends of the film, that is, the part that will form the bottom fused part 9, are vertically fused to form a cylinder, and by repeating filling, horizontal fusion, and cutting, the zipper filled with the contents is tightly sealed. We were able to manufacture bags.

The automatic bag making and filling machine used was a regular automatic bag making and filling machine.
The unwinding machine for supplying film was modified so that it reciprocated in the axial direction in synchronization with the self-travel of the film, so that it could always supply undistorted film.

When the wound film of the present invention was supplied using this machine, it was possible to continuously produce bags with contents as shown in FIG. By using this C film and machine, it was possible to manufacture the contents-filled zipper 9 at high speed and stably, with reliable engagement of the male and female zipper claws and accurate folding position force of the film. In FIG. 6, 31.31 is a side fused portion, and 9 is a bottom fused portion. 3
3 is a V-notch, and when it was simply pulled to open the package, tearing started from this location and was guided to the internal and external lead wires 5.6, resulting in a straight opening line.

[Effect of eruption]

ADVANTAGE OF THE INVENTION According to the present invention, it is possible to obtain a zipper-packing roll film that can be incorporated into a conventional automatic bag-forming and filling machine without complicated operations and can be operated without special skills. By supplying it to the machine, automatic bag making and filling can be carried out efficiently.

Furthermore, since the distance between the male and female zipper claws of the present invention is constant regardless of the film width, there is no need to adjust the distance between the molten resin extrusion devices even if the supplied film width changes, reducing the actual working time of the machine. Can be extended.

[Brief explanation of drawings]

The drawings show embodiments of the present invention; FIG. 1 is a side view, FIG. 2 is an enlarged sectional view of the central part of the film, FIG. 3, FIG. 5 is a view taken along the V line in FIG. 3, and FIG. 6 is a plan view of a bag manufactured using the film of the present invention. In the drawings, the symbol ■ is a film, 2 is a paper tube, 3 is a male claw, 4 is a female claw, and 5
．． 6 is a lead wire, 7 is a male claw die, 8 is a female claw die, 9 is a bottom fusion part, 10 is a raw fabric roll, 13 is a joining roll, 14 is a winding machine,
t5 is a die holder, 18 is a water nozzle, 19 is an air nozzle, 20 is a rail, 21 is a wheel, 22 is a shaft, and A is a center line.

Claims (2)

[Claims] (1) A film wound around a core, in which male and female resin zipper claws, which serve as engagement tools, run along the longitudinal direction at the center in the width direction, and are required on the outside of the zipper claw after bag making. A wound film with a zipper claw, which is formed by continuously fusing each film at intervals of twice its length, and winding the film in a meandering manner around a core. (2) Female and male resin zipper claws, which are articulating tools, are placed in the center of the film in the width direction along the longitudinal direction, maintaining a distance twice the required length from the outside of the zipper claws after bag making. A method for producing a wound film, which is characterized in that the films are individually fused and then wound in a meandering manner around a core.