JPS60159041A - Manufacture of baggy article of synthetic resin film - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a method for producing a bag-like article made of synthetic resin film.

Conventionally, the length of 4@
After forming a large number of seal parts each consisting of two seal lines transverse to each other and one broken line cut part located between them at a predetermined interval, the broken line cut parts of the seal parts are separated. The method for producing individual bags made of synthetic resin film is widely used and known.

This manufacturing method has some differences depending on the form of the target feed film, such as whether or not it is necessary to form a sealing part in the bag-like product, whether or not it is necessary to form an opening, and the position where these are formed. However, in both Yangkai, two-layered long film was used.
A portion in which a plurality of seal portions, each consisting of two seal lines transverse to the long axis and a broken cut portion located between them, are formed at predetermined intervals is commonly included. That is, for example, if the target film is made of two overlapping flat films, for example, before and after forming the seal part, one of the other ends outside the seal part is sealed;
If the other end is used as an opening for filling the contents, ■
If the target film is folded at one end and overlapped to form two flat films, for example, if you just press the seal part above and the other end of the overlap becomes a mouth part, ■ the target film When the film is a cylindrical film that is folded flat, for example, when the above-mentioned sealing part is formed and one of the other ends outside the above-mentioned sealing part is cut out to form an opening, various shapes may be used. There is actually a method for manufacturing bag-like products.

However, all of the bag-shaped items that can be served are continuous at the broken line cut part and become a long 11, so for example, if you roll this into a roll, the user can easily cut it into large or short pieces, and the user can also check the contents. It has many advantages, such as being able to continuously and rationally feed and transport pouches during filling, and can be easily separated into individual capsular proboscises as required, so they are widely used. It is being utilized.

In this case, the broken line-shaped cut portion is formed by piercing a saw blade-shaped blade film with a sharp tip as shown in FIGS. 1(a) and (b) when forming the seal edge. It has a perforation shape as shown in (C). and,
If you adjust the length of the cut part and non-cut part, for example by increasing the length of the cut part or shortening the length of the non-cut part, it will easily break off and continuous feeding performance will not be satisfied. On the other hand, if the length of the cut part is shortened or the length of the non-cut part is lengthened, it becomes difficult to cut and release, so it is necessary to maintain a balance between continuous feeding performance and separation performance. The saw blade is designed to suit the film material.

However, with this method, for example, in the case of a laminated film, the two films at the cut edge may curl, and in the case of a heat-shrinkable film, the shrinkage of the cut edge becomes uneven, resulting in a poor appearance. It had

In addition, especially when the film material has a low tensile strength at the sealing temperature, for example, a film made of a complete blend of soft ethylene-alpha olefin resins, or a film with a melting point resin layer and a low melting point resin layer. If the film is a laminated film with a high melting point resin layer as a seal layer, in this case, if you try to form a broken line cut part using the above method, the seal line will stretch in the feeding direction during formation. Problems such as cracking or cutting occurred. Furthermore, if tensile stress is applied during continuous feeding after sealing, the seal line tends to stretch in the feeding direction, and if you try to separate the sheets one by one, the seal line may be cut off, or the seal line may be damaged during vacuum packaging. They were only able to make things that were impractical, such as karaage and zonk. These defective phenomena could not be resolved at all even by changing the pitch of the saw blade to adjust the lengths of the cut and non-cut parts, or by adjusting the length of the sealing part. Furthermore, even if the saw blade was heated to make it easier to cut, or the seal portion was forcedly cooled with cold air from the outside, the problem could not be completely resolved. This was a completely new problem, and a technology to solve it was desperately needed.

The present invention has been made in view of the current situation, and the first purpose is that even if the film material is a film that exhibits a low tensile strength value, it will be difficult to remove the film when forming a broken line cut portion and during continuous feeding. There is no stretching or breaking of the seal wire in the feeding direction,
Another object of the present invention is to provide a method for manufacturing a bag-like product* that can be easily cut off.Secondly, to manufacture a bag-like product that has a good outer iron at the cut end and does not curl or shrink unevenly at the cut end. The present invention provides a method.

The above object is achieved by the method of the present invention, that is, a two-ply long film to be fed is provided with two seal lines in a direction transverse to the length thereof, and one broken line cut portion located between them. In the method for manufacturing a synthetic resin film, in which a large number of seal parts are formed at predetermined intervals, and then the broken line cut parts of the seal parts are cut to form individual bag-like products, the method described in 2.
A broken line-shaped cutting member forming a broken line-shaped cutting part formed on the seal line is provided with cutting parts arranged at regular intervals in the longitudinal direction of the cutting edge that extends linearly and flatly, For the cutting part, use a blade with a width of 0.5 to Z, Om+, a depth of 2 mm or more, and a regular interval of 10 to 20 times the width of the cutting part, and use it as a still temperature heating blade. This can be easily achieved by employing a method for producing a bag-like product of a synthetic resin film having a t-% characteristic.

Below, the essence of this F1 investigation will be explained in detail with reference to the drawings.

Figure 2 shows 19! of an apparatus which is advantageous for the method of manufacturing bag-like products of the present invention.
This is a factor that indicates l. The cylindrical film 1 unwound from the roll-shaped film 1' is cut at one end by the cutter 2 and moved onto a belt conveyor by a temporary delivery roll 3.4 with an opening formed, and moved to below the sealing part forming member. and stop. Next, the seal forming member, which has an integrated structure of two seals/each and the broken line cutting blade of the present invention located between them, is lowered to form two seals on the film and between them. Form a broken line cut. The thickness of the sealer's tip is 1 to 4 mm, and the inner distance of the seal saw's tip is selected from 1 to 8 mm.The temporary line cutting part is located at the center of the sharp tip and its edge, and there is some ingress and egress. It is preferable that the two seal saw tips are disposed on the same plane. Thereafter, the seal portion forming member is raised, and while the seal portion is cooled by the cooling air discharged from the cooling air discharge nozzle 5, the film is conveyed by a belt conveyor and wound into a roll by the winder e.

The method of manufacturing bag-like products using this device can only be completed by adopting the method of the present invention, and the important features are: (a) Using a blade shaped like a dotted line for the broken line cutting member.

(b) Use the blade mentioned above after heating it.

It is a combination of

Figures 3 (a), (b), and (c) are schematic diagrams showing an example of the structure of the blade used in the method of the present invention. It shows the dashed cut that has been formed. To explain the structure of the blade used in the present invention with reference to FIG. 3, it has a structure in which cut portions and flat portions are arranged alternately, and the width W of the cut portion is 0.5 to 2wn and the depth D of the cut portion. It is safe if the width of the flat part is 2 to 20 times the width of W. The reason for this is that the cut part and the flat part have the role of forming a non-cut part and a cut part, respectively, and if the width of the cut part is less than 0.5 mm, the formation of the non-cut part is unstable, and it is easy to break when continuously feeding. 2. Ow+
If it exceeds the limit, the uncut portion will become torn, making it difficult to separate and the cut end will look over the outer fitting, making it difficult to see.

Furthermore, this is because the seal line tends to elongate during continuous speed running. Preferably, the depth of the cut is less than 1 round, and if the depth of the cut is less than 2 TMA, the formation of the uncut part will be unstable.
It breaks easily and makes continuous feeding difficult.

On the other hand, if the length of the flat part is less than 10 times the length of the notched part, the ratio of the uncut part to the broken line-shaped cut part is large, making it difficult to separate, and the visibility after cutting becomes poor.

Moreover, if it exceeds 20 times, the uncut part becomes easy to break due to the tensile stress applied during continuous speeding, and even in the process of winding into a roll, the uncut part tends to break and the resulting width deviation occurs. Preferably, it is 15 times or less.

Next, the need for requirement (b) is that by heating and using the film, the entire cut part can be formed simply by pressing the flat part into contact with the film, and the tension applied to the seal line when forming the broken line Wr part Z et al., where the stress is so small that no elongation of the seal wire occurs. In this case, the temperature at the tip of the blade must be high enough to melt and cut the film material. For example, if the temperature is too low, the cut W [section] may not be formed, or even if it is formed, it may be incomplete. , it becomes difficult to separate, and the seal line tends to stretch during continuous feeding. In order to form a cutting part on the whole body, cut the tip of the blade 1.
The temperature of the blade and Solper can be controlled separately, and it is best to use a heat insulating layer between them, such as a structure with an air barrier between them. . In addition, in order to prevent the film from welding to the heating blade when the heating blade cuts the film by 1°, the tip of the blade is coated with Teflon, or the film is coated with a Raflon sheet. f: You may press it. A further advantage of using the still-heated blade is that the seal wire does not break at 1ψ, which occurs during continuous feeding after sealing. This is formed by the notch part of the sword.6'fi: Because the Kano-kiri part is softened by the heat of the blade, it stretches itself to absorb the tensile stress when the film is fed, so that the υ line is uniform. It is thought that this reduces the stress on the seal wire. In addition, because the two films above and below the cut end of the obtained bag-like product are fused by the heat of the blade, the cut end has a good appearance without any defects such as curling or uneven shrinkage. It also improves machining speed efficiently.

By satisfying the above requirements, all of the problems of the present invention can be solved. However, in order to fully demonstrate the effects, for example, as a means for continuous feeding of the film, it is necessary to It is preferable to form the seal portion with , since the film can be fed with lower tensile stress. In addition, if the heat-shrinkable film is easily deformed by heat, as shown in Figure 2, you can shrink the seal line by blowing cold air from both outsides of the seal towards the film at the ground contact area of the seal. It is preferable that it is more effective in preventing elongation and elongation.

As described above, the present invention has the above-described structure, and the resulting packaging can be easily separated into individual pieces without stretching or cutting of the seal line, compared to when a general saw blade is used. The appearance of the cut end is good,
Since the seal wire is strong, it will not be destroyed when filling temporary packages or vacuum packaging, making it sufficiently durable for practical use.

The method of the present invention is particularly effective for films with low tensile strength at the sealing temperature, regardless of whether they are single-layer or multi-layer, and have suitable sealing strength when deformed.The initial elongation of the film at the sealing temperature is slow to 100%. The minimum value of tensile stress is 100
It is a film with g/lrrm2 or less.

Next, examples of the present invention will be shown.

implementation? l1-1 Ethylene-vinyl acetate copolymer [vinyl acetate-containing f15 molti, Melt Intex (MI) 2:16ON lid and ethylene-α-olefin copolymer distomer [α-
The olefin was copolymerized with 15 mol of propylene and 2% by weight of ethylidene/norgelnene, MIo, 4
5. Density 0.88 g/cnl", Vicat softening point 4
0℃ or below] Mixed with 40 wt% tree wood degree 0-88 g 7
A bag-like article was produced by the method of the present invention using the apparatus shown in Fig. 2 using a 1-shaped film with a width of 300 mm made of a two-layer stretched film with a 4% copolymerization of ethylene and copolymerized with 4% by weight of ethylene as a raw material. did. For broken line cut parts, 0.7m inside the notch.
A blade with a depth of 3 mm and a flat part width of 10+++ m was heated to a tip temperature of 250° C. and used. At this time, the temperature at the tip of the seal nozzle was 240°C.

The result of evaluating the appearance and sticking after shrinkage (measured in accordance with ASTM F1a) of the 7-el elongation state of the obtained packaging and the tensile strength of the separable seal portion is shown in Part 1.

Comparative Example-1 In the manufacturing method using the apparatus shown in FIG. 2 of Example-1,
A saw blade (width of the blade: 3 motions, tip angle of 40 degrees, quietness: 10+m, pitch: 2 mm) is used for the broken-line cutting member, and a pair of IKs are used instead of a belt conveyor as the feeding means.
A bag-like product was produced under the same conditions as in Example-1, except that a dynamic roll was used, and the same evaluation as in Example-1 was performed. The results are shown in Table 1.

The present invention provides a method for obtaining a bag-like object made of film material, which has not been possible until now, and also provides a
Providing a method that is superior to conventional methods would be of great significance to industry.

Below margin

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing a broken-line cut portion formed by a conventional method and the members forming it, in which (a) is a plan view of the member, (b) is a cross-sectional view of the member, and ( C) is a broken cut portion formed in the film. FIG. 2 shows an example of an apparatus using the method of the present invention. In the figure, 1' is a roll of cylindrical film, 2II'i is a cutter for cutting off one end, and 3. 4 is a film feed roll, 5 is a cooling air discharge nozzle, 6 is a Teflon sheet, 7 is a seal nozzle, 18 is a heater, 9
1o is a broken-line cutting member, 1o is a heater, 11 is a belt drive roll, 12 is a feeding belt conveyor, 13 is a receiving table, and 14 is a bag-like material wound into a roll. FIG. 3 is a schematic diagram showing the broken line cut portion formed by the method of the present invention and the members forming it, in which (&) is a plan view of the member, (b) is a sectional view of the member, (C) is a broken line cut portion formed in the film. Patent applicant Asahi Kasei Koto Co., Ltd.

Claims (1)

[Claims] (1) A large number of seal sections, each consisting of two seal lines transverse to the long axis and one broken line-shaped cut section located between them, are placed at predetermined intervals on a two-ply long film to be fed. In a method for manufacturing a bag-like product of a synthetic resin film, in which the bag-like product is made into individual bag-like products by cutting off the broken-line cut portion of the cough cool part after forming, the broken-line shape sandwiched between the two seal lines is A cut portion is arranged on a broken line-shaped cutting member that forms a cutting portion, and the cut portion is arranged at a predetermined interval with respect to the longitudinal force of the cutting edge extending linearly, and the width of the cut portion is 0.5 to 0.5 mm.
20 mm, the depth is 2 or more, the specified interval is 10 of the width of the notch
A method for producing a bag-like product of synthetic resin film, which is characterized in that a blade with a diameter of ~20 times is used as a high-temperature heating blade.