KR100825638B1 - Method for preparation of the pouch consisting of the synthetic resin film - Google Patents

Abstract

A manufacturing method of a synthetic resin film envelope is provided to make a bonded part of the envelope a wide band shape using synthetic resin film with weak heat-resistance by attaching synthetic resin film with weak heat-resistance to synthetic resin film with strong heat-resistance to be separated easily and heat-pressing the films. A manufacturing method of a synthetic resin film envelope by heating and bonding three sides of a raw synthetic resin film(1) with weak heat-resistance comprises the steps of: forming a separation layer(3) on a synthetic resin film(2) with strong heat-resistance; forming a printing layer(4) on the separation layer; laminating the synthetic resin film with weak heat-resistance on the printing layer of the synthetic resin film with strong heat-resistance; locating the laminated film between an upper and a lower heating plate, to make the other surfaces of the synthetic resin film with weak heat-resistance contact with each other, and the synthetic resin film with strong heat-resistance contact with the upper and the lower heating plate; heating and pressing the film attached with the synthetic resin film with strong heat-resistance to make the bonded part in a band shape; and separating the synthetic resin film with strong heat-resistance from the synthetic resin film with weak heat-resistance at the separation layer.

Description

Method for preparation of the pouch consisting of the synthetic resin film

1 is a cross-sectional schematic diagram of an apparatus used to make an envelope from a heat resistant synthetic resin film.

Figure 2 is a sectional view of the welded portion showing the welded portion of the envelope produced by the first FIG.

3 is a schematic cross-sectional view of a known apparatus used to make an envelope from a low heat resistant synthetic film.

4 is a sectional view of a welded portion of the envelope produced by the FIG. 4 apparatus;

Figure 5 is a cross-sectional view of the synthetic resin film fabric used in the present invention.

The present invention relates to a method for producing a synthetic resin film bag, in particular a synthetic resin film for producing a synthetic resin film bag by fusing to form a band-like welded portion around the periphery using a synthetic resin film, for example, a polyethylene film or a polypropylene film having low heat resistance It relates to a film bag manufacturing method.

Synthetic resin film bags are manufactured using a synthetic resin film having a high heat resistance and a synthetic resin film having a low heat resistance, depending on the use thereof.

A film fabric used to make a synthetic resin film bag, using a laminated film in which a heat resistant synthetic resin film or aluminum foil is laminated on one surface of a synthetic resin film having low heat resistance, or a film having low heat resistance, such as polyethylene or polypropylene. The film is used alone or a film obtained by laminating a polypropylene film on a polypropylene film.

In general, an envelope using a film fabric in which a weak heat-resistant film is laminated on an elongated heat-resistant synthetic resin film has a tendency to partially rupture when the rupture strength is partially damaged and the rupture portion expands to the periphery. When the envelope is manufactured from such a film, the envelope may be manufactured by fusion such that a band-like fusion is formed at the periphery except for the open end of the envelope. The envelope is always tensioned until the film is fused and cut into one envelope. Even if this is applied, the film fabric is not cut or broken, and the fusion portion is not deformed or the resulting envelope is not deformed.

Figure 1 shows an example of an apparatus for producing an envelope from the above-described heat-resistant synthetic resin film. According to this apparatus, the heat-resistant synthetic resin film 11 is supplied from the cloth supply roller 10 while being tensioned by the roller 18, and the heating and cooling are repeated in the heater 12 and the cooler 14. After being compressed while being fed, the center of the compressed portion was cut at the cutting blade 19 to obtain an envelope 20. The film having high heat resistance does not show a phenomenon in which the cut portion is cut at the welded portion even when the cut portion is cut evenly and uniformly and is subjected to tension when welding.

FIG. 2 shows an envelope made of a film having heat resistance manufactured by the apparatus of FIG. 1 described above, and it can be seen that a wide fusion portion 22 is formed in a band shape around the periphery of the envelope 20.

However, even when manufacturing an envelope using a synthetic resin film having low heat resistance, if the peripheral edge of the envelope is fused in a band form using the apparatus of 1, the film is under tension, and the welded portion is cut at the same time as the fusion. Therefore, when making an envelope using a synthetic resin film having low heat resistance, the cutting blade is instantaneously lowered on the rotating roller without squeezing between the hot plates to form a fusion portion in a band shape so that the synthetic film is fused at the same time. Doing.

Figure 3 shows an example of an apparatus for producing an envelope using a synthetic resin film of low heat resistance. According to FIG. 3, the synthetic resin film having low heat resistance is supplied under tension, but the cutting blade 32 installed above the rotating roller 30 descends instantaneously while being descended, thereby simultaneously compressing the film so that the film is linearly fused and cut. Hot wire closure at the site. 4 shows a fusion portion of an envelope formed by the above-described conventional apparatus. 4 shows an envelope 34 manufactured by the above-described conventional apparatus, which can be seen that the fusion portion 36 has been linearly bonded.

As described above, the apparatus for producing a bag using a synthetic resin film having a high heat resistance and the apparatus for manufacturing a film using a synthetic resin film having a low heat resistance are different from those in which the synthetic resin film having a weak thermal resistance is manufactured by the apparatus of FIG. When heat-resisting synthetic resin film is crimped in a band form when compressing the periphery of the bag under tension, the periphery of the bag is heated by means of hot wire sealing means because it is fused at the crimping part and cut at the same time. It should be cut at the same time as welding.

Envelopes made of synthetic resin films with low heat resistance are more flexible than envelopes made of synthetic resin films with high heat resistance, and the rupture does not extend to the surroundings even when partially ruptured. It is becoming. However, as described above, the envelope prepared by hot-sealing the synthetic resin film having low heat resistance was ruptured at the welded portion because the welded portion was fused in a line shape instead of being band-bonded. Therefore, it is known that when the envelope is manufactured using a synthetic resin film having low heat resistance and the welded portion is fused in a band shape, the rupture at the welded portion can be prevented to a minimum. It is known that it is impossible to fuse by this band form by the known method so far.

It is an object of the present invention to provide a method for producing a bag that is widely fused such that a welded portion is band-shaped using a synthetic resin film having low heat resistance.

The object of the present invention described above is to bond the heat-resistant synthetic resin film on the opposite side surface of the synthetic resin film having low heat resistance so that the heat-resistant synthetic resin film can be easily separated and supplied under tension, so that the heat-resistant synthetic resin film has a band at the adhesive surface. It is achieved by the method for producing a synthetic resin film bag of the present invention to form a bag by adhering to a mold and to separate and remove the heat resistant film from the formed bag.

The present invention relates to a method of manufacturing an envelope using a weak heat-resistant synthetic resin film, wherein the heat-resistant synthetic resin film is easily bonded to the surface opposite to the surface to be bonded to the low heat-resistant synthetic resin film to be easily separated. Forming a peeling layer on the entire surface of the film, printed on the peeling layer printed on the surface of the printed resin layer of the strong heat-resistant synthetic resin film laminated on the surface of the low-heat resistance synthetic resin film using an apparatus for producing an envelope from a strong heat-resistant synthetic film It is composed of a method of manufacturing a synthetic resin bag with a heat-resistant weak synthetic resin film that is fused to the band around the envelope to be band-shaped, then cut the welded portion and removes the heat-resistant synthetic resin film.

In particular, the present invention is a method for producing a bag by heat-sealing three peripheral portions of the raw film consisting of a synthetic resin film of low heat resistance,

1) forming a release layer on the surface of the synthetic resin film having a high heat resistance,

2) forming a printing layer on the surface of the release layer,

3) laminating a weak heat resistant synthetic resin film on the surface of the printing layer of the strong heat resistant synthetic resin film,

4) disposing between the upper and lower heating plates such that the back surfaces of the synthetic resin film having low heat resistance are in contact with each other, and the two thermally resistant synthetic resin films are in contact with the upper and lower heating plates.

5) heat-compressing the film fabric to which the heat-resistant synthetic resin film is attached so that the fusion portion becomes a band;

6) Low heat resistance synthetic resin film It comprises a method of producing an envelope from a low heat resistance synthetic resin film comprising the step of separating the high heat resistance synthetic resin film from the fabric layer.

The method of the present invention preferably uses the apparatus of FIG. However, it can also be carried out by using another apparatus for welding the peripheral fusion to the band form.

The fabric of the bag used in the present invention uses a synthetic resin film bonded to the synthetic resin film surface having a low heat resistance so as to easily separate the high heat resistant synthetic resin film. Envelope fabrics in which synthetic resin films with high heat resistance are bonded to synthetic resin films with low heat resistance may be used for laminated films that are easily bonded to synthetic resin films with low heat resistance so that the thermally resistant synthetic resin films can be easily separated. It is also possible to directly enter the bag making process while laminating a heat-resistant synthetic resin film on the film surface.

In the present invention, as the film having low heat resistance, a polyethylene film such as an LLDPE film or an LDPE film may be used, or a polypropylene film may be used. Moreover, the laminated | multilayer film which laminated | stacked two sheets of the polyethylene film and polypropylene film mentioned above can also be used, and the laminated | multilayer film which laminated | stacked the polyethylene film and the polypropylene film can also be used.

It is preferable to use PET film or nylon film as the film having high heat resistance, but in addition, if the film having low heat resistance is not fused to the film having low heat resistance at the temperature where the film is fused and the films having high heat resistance are not fused to each other, Any kind of synthetic film can be used.

The above-mentioned heat resistant synthetic resin film is coated with a release agent to form a release layer, and the release layer is formed on the entire surface of the synthetic resin film having high heat resistance. This release layer may be formed by a conventional release layer forming method such as a gravure printing method, and a printing layer is formed on the surface of the release layer. The above-described print layer may also be formed by a conventional printing method. When the above-described printed layer is laminated on the surface of the bag fabric by dry lamination method or extrusion coating method, only the printed layer is transferred to the film with low heat resistance and peeled off from the release layer to separate the film with high heat resistance from the film with low heat resistance. It became possible.

The peeling layer mentioned above can be formed using a normal peeling agent. Such a peeling layer contains wax. When the laminate is pressed and laminated onto the transfer object, only the print layer is transferred to the transfer object and peeled off from the release layer. The release layer is, for example, the release layer contains 95-98% by weight of acrylic resin (Tg 80 or more) and 2-5% by weight of low molecular weight polyethylene resin (molecular weight 1800-8000), and then 20-40% by weight of this blend. It can be formed by adding 60-80% by weight of a mixed solvent in which toluene and methyl ethyl ketone are mixed 1: 1, and coating the entire surface of the heat resistant resin with a thickness of about 5 to 12 g / m 2. Such a peeling layer can also be formed using the composition comprised from other components other than the above-mentioned peeling agent.

In general, a method of laminating another synthetic resin film on the surface of the synthetic resin film is subjected to corona treatment on the synthetic resin surface and bonded with an adhesive composed of synthetic resin. Corona treatment forms a concave-convex surface on the surface of the synthetic resin film to allow complete bonding between the two films. According to this method, the two resin films are not separated from each other because complete adhesion is achieved between the two films. Therefore, in the present invention, a strong heat resistant synthetic resin film is adhered to the surface of the synthetic resin film having low heat resistance using a release agent so that the high heat resistant synthetic resin film can be easily separated after the bag is manufactured.

The printing layer formed on the surface of the release layer is formed by using a conventional printing ink used for thermocompression transfer paper on a transfer paper and printing by a conventional gravure printing method.

The envelope fabric is supplied to the heat compression means in a state in which the synthetic resin films having low heat resistance to be bonded are in contact with each other, and the synthetic resin films having low heat resistance are fused to each other by instantaneous thermal compression. The hot pressing means is formed of upper and lower hot plates and is heated to 150-250 ° C. to fuse the synthetic resin films having low heat resistance by instantaneous pressing.

Since the above-mentioned high heat resistance synthetic resin film should not be melted at the temperature at which the above-mentioned polyethylene film is fused, a synthetic resin film having a melting point of 200 ° C. or higher is preferable. However, the above-mentioned heat resistant film is preferably a soft film having the same softness as that of the low heat resistance synthetic resin film so as to be smoothly supplied with the low heat resistance synthetic resin film. Therefore, it is preferable to use the flexible film which is not melted by the instantaneous heat of 200 degreeC for heat resistant film.

Hereinafter, the present invention will be described in detail with reference to the drawings.

The method for producing a synthetic resin bag of the heat resistance of the present invention can be used a well-known device shown in FIG. An example of an envelope manufacturing method according to the present invention for producing an envelope using the apparatus shown in FIG. 1 will be described. Figure 5 shows an example of a synthetic resin film fabric used in the present invention. According to Figure 5 synthetic resin film fabric (1) of low heat resistance uses a polyethylene film. The film having low heat resistance may be a laminated film obtained by laminating a polypropylene film on a polyethylene film. The film 2 with strong heat resistance formed the peeling layer 3 in the whole surface, and the printing layer 4 was formed in the surface of the peeling layer 3. As shown in FIG.

The envelope fabric of the present invention consists of a polyethylene film. As the heat resistant film, a heat resistant film such as PET film or nylon film is used, and a peeling layer is formed on the entire surface of the heat resistant film, and a printing layer is formed on the surface of the peeling layer. When the printing layer formed on the surface of the film having high heat resistance is laminated with a urethane-based adhesive against a film having a low heat resistance polypropylene film or polyethylene film, the printing layer is transferred to the surface of polypropylene or polyethylene laminated film having low heat resistance and heat resistance The strong film came to separate from the release layer.

According to FIG. 1, heating and cooling in the heater 12 and the cooler 14 are performed while the envelope fabric 11 is supplied from the supply roller 10 with the tension applied by the rollers 16 and 18. Repeated three times and then conveyed to the pressing means. The pressing means consisted of upper and lower pressing plates and was heated to 200 ° C. to melt the polyethylene film by instantaneous pressing. The polyethylene film is fused in the form of a band between the two pressing plates, and then, after passing through the pressing plate, the polyethylene film is cut with a cutting blade 19 at the fused portion in the form of a band to form an envelope-shaped product having a heat-resistant PET film attached to the outer surface thereof. 20) is sent out by the conveyor belt. Separation and removal of the heat-resistant film from the sent-out bag from the release layer yields an envelope composed of a synthetic resin film having low heat resistance required and a band-shaped crimp portion at the periphery. 2 shows an example of an envelope manufactured by the above-described apparatus, and it can be seen that a fusion portion 22 is formed in a band shape at the periphery of the envelope 20.

According to the method of the present invention described above, since the heat resistant film supports the tension applied to the polyethylene film having low heat resistance, and the hot plate of the heater is pressed in contact with the heat resistant film, the synthetic resin film having low heat resistance at the time of heat compression by the hot plate is used. They are glued to each other but cut or stretched so that the subsequent partial fusion position of the next step does not change.
EXAMPLE
Example 1
95% by weight of acrylic resin (Tg 8 ° or more) and 5% by weight of low molecular weight polyethylene resin (molecular weight 1800-8000) are mixed on the entire surface of the PET film without corona treatment, and 30% by weight of the mixture is mixed solvent ( The release agent composition formed by diluting by adding 70% by weight of toluene and methethyl ketone 1: 1) was coated with a thickness of about 5 to 12 g / m2 by a gravure printing method to form a release layer, and printed on the surface of the release layer. The layer is printed by a method such as gravure printing to form a print layer. Applying a urethane-based adhesive to the printed layer surface of the PET film, laminated with a polyethylene film and squeezed so that the adhesive portion is formed into a 2.5mm band, cut in the middle of the welded portion, and the PET film is separated from the release layer to band An envelope formed of a polyethylene film having low heat resistance having a phase fusion portion is obtained.
The tension was applied to the raw film composed of the polyethylene / polypropylene film during the bag making process, but was not cut at the fusion. According to this method, an envelope in which the print layer is formed on the polyethylene film by a transfer method is obtained.
Example 2
An envelope was prepared by the method of Example 1, and an LLDPE / LDPE laminated film was used as the film fabric.
Example 3
An envelope was manufactured by the method of Example 1, and a polypropylene / polypropylene laminated film was used as the film fabric.
Example 4
An envelope was prepared by the method of Example 1, and a nylon film was used as the heat resistant synthetic resin film.

According to the present invention described above, even when a polyethylene film or a polypropylene film having low heat resistance is used, an envelope in which the peripheral fusion portion is band-shaped can be obtained, and the effect that the phenomenon of cutting due to tension in the fusion portion does not appear during envelope processing. There is.

In particular, the method of the present invention has a feature that can be advantageously used for the production of an envelope for forming a printing layer on the surface of a synthetic resin film having a low heat resistance by a transfer method.

delete

delete

delete

delete

delete

delete

delete

delete

delete

delete

Claims (4)

In the method of manufacturing a bag by heat-sealing three peripheral portions of a raw film composed of a synthetic resin film of low heat resistance, 1) forming a release layer on the surface of the film having high heat resistance, 2) forming a printing layer on the surface of the release layer, 3) laminating a weak heat resistant synthetic resin film on the surface of the printing layer of the strong heat resistant synthetic resin film, 4) disposing between the upper and lower heating plates such that the back surfaces of the synthetic resin film having low heat resistance are in contact with each other, and the two thermally resistant synthetic resin films are in contact with the upper and lower heating plates. 5) heat-compressing the film fabric to which the heat-resistant synthetic resin film is attached so that the fusion portion becomes a band; 6) Synthetic resin film bag manufacturing method comprising the step of separating the heat-resistant synthetic resin film from the release layer from the synthetic resin film fabric of low heat resistance. The method of claim 1, after the step 5) compressing the film fabric adhered to the heat-resistant synthetic resin film, and then separating the heat-resistant synthetic resin film from the heat-resistant synthetic resin film 6) before the band-like fusion portion Cutting the center of the method. The method of claim 1, wherein the synthetic resin film having low heat resistance is selected from polyethylene, polypropylene, and laminated films thereof. The method of claim 1, wherein the heat resistant synthetic resin film is selected from PET film and nylon film.

Images