JPH091665A - Heat sealing of multiple object - Google Patents

Abstract

PURPOSE: To obtain a simple and effective heat seal method applying surface treatment to the place becoming the non-fusing part of a multiple object to set the same to specific wet tension or more to perform the heat fusion of the multiple object to simultaneously generate a fusing surface and the non-fusing surface. CONSTITUTION: Surface treatment is applied to a multiple object so that the set tension of the non-fusing part thereof becomes 42dyne/cm or more before the multiple object is thermally fused. That is, two films 2a wherein the single surfaces 3a of end parts becoming non-fusing parts are preliminarily subjected to corona discharge treatment are superposed one upon another so that the treated surfaces become outside and the untreated surfaces become inside to obtain a film multiple object 1a. Two films 2b wherein the single surfaces 3b of end parts becoming non-fusing parts are preliminarily subjected to corona discharge treatment in the same way are superposed one upon another so that the treated surfaces become outside and the untreated surfaces become inside to obtain a film multiple object 1b. When the multiple objects 1a, 1b are superposed one upon another and the end parts 3a, 3b subjected to corona discharge treatment are thermally fused, the inner surfaces (4a and 4a, 4b and 4b) not subjected to corona discharge treatment are thermally fused and the multiple objects 1a, 1b are not thermally fused and a large number of films can be heat-sealed at once.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-sealing method for a multiplex body, and more specifically, a multiplex body in which thermoplastic resin films or sheets are superposed, a film, a sheet and a reinforcing strip are superposed. Multiple layers, such as multiple layers, films, sheets, and zipper tapes, etc., can be fused in a single heat-sealing operation in areas that do not need to be fused (non-fused areas). )
And a heat-sealing method capable of simultaneously forming The method for heat-sealing the multiplex body of the present invention is, for example, a case where a reinforcing tape is fused to reinforce the opening of the bag, or a thermoplastic resin zipper tape is fused to the film, sheet and bag. It is preferably used when heat-sealing the above.

[0002]

2. Description of the Related Art A zipper packaging bag having a thermoplastic resin zipper formed on a thermoplastic resin bag such as polyolefin is formed by using the same mold for the film and the zipper. A method of simultaneously and continuously forming a film with a zipper (Japanese Patent Publication No. 35-5972).
Japanese Patent Publication No. 38-18344), a method of adhering a preformed thermoplastic resin chuck using an adhesive to a preformed laminated film, and a molten thermoplastic resin extruded by extrusion onto the preformed laminated film. A method of fusing a chuck made from a material (Japanese Patent Publication No. 60-44126, Japanese Patent Publication No. 63-274527) is known. In addition, a method of forming a zipper tape made of a thermoplastic resin in advance and fusing the tape to a base material film forming a bag body by means of heat fusion or ultrasonic sealing (Jpn.
No. 1004, Japanese Patent Publication No. 5-71444) and the like. Conventionally, when the thermoplastic resin zipper tape is formed in advance, the tape is placed inside the bag opening and a part of the tape is heat-sealed to the base film, or the reinforcing strip is provided in the bag opening. When heat-sealing, cellophane paper, release paper, etc. is attached to the part that you want to leave as a non-fusing part, and after cell-sealing, the cellophane paper, etc. is removed, or a special varnish is applied to the media treatment. Such a complicated process was performed.

[0003]

DISCLOSURE OF THE INVENTION The present invention is a bag with a reinforcing tape and a zipper with a reinforcing tape for reinforcing the opening of a multiplex or a bag in which films and sheets are stacked as described above. When heat-sealing a bag etc., attach cellophane paper to the part you want to leave as a non-fusion part,
It is an object of the present invention to provide a simple and effective heat sealing method by avoiding a complicated method such as a removing method and a medium treatment.

[0004]

Means for Solving the Problems As a result of intensive studies for solving the above-mentioned problems, the present inventors have found that a reinforcement for reinforcing an opening of a multiplex or a bag in which films and sheets are superposed on each other. Reinforcement tape bag with overlapping tapes,
When heat-sealing a bag with a zipper, by applying a wetting tension in a specific range by surface treatment to the part you want to leave as a non-fusing part, you can freely control the fusing part and the non-fusing part. The inventors have found what can be done and have reached the present invention.

A first aspect of the present invention is to heat-seal a multi-layer body including a thermoplastic resin film or sheet,
Wet tension of 42 dyne /
A heat-sealing method for a multiplex body, which comprises heat-bonding after surface-treating to cm or more.

A second aspect of the present invention is a method of heat-sealing a band-shaped body to a folded portion of an opening of a bag made of a thermoplastic resin film or sheet or to an inner surface and / or an outer surface of the opening, in which the non-fusing is performed. A heat-sealing method for a multiple body, characterized in that after the inner surface of the bag to be a part or the inner surface of the strip is surface-treated to have a wet tension of 42 dynes / cm or more, the contact surface between the bag and the strip is heat-sealed. is there.

The thermoplastic resin of the present invention is not particularly limited to polyolefin resin, polyester resin, polyamide resin, polyvinyl chloride, polyvinylidene chloride, polycarbonate, etc., but is economical, mechanical properties, From the viewpoint of the balance of optical properties and the like, it is preferable to use a polyolefin resin as a base. Examples of the polyolefin resin include ethylene, propylene,
Homopolymers of α-olefins such as 1-butene, 1-hexene, 4-methyl-1-pentene, and 1-octene or copolymers of the above α-olefins, or the above α
There may be mentioned copolymers of olefins with other monomers and mixtures of two or more thereof. In particular,
High / medium / low density polyethylene, linear low density polyethylene, ultra low density polyethylene, polypropylene, ethylene-propylene copolymer, polybutene-1, poly-4-methylpentene-1, ethylene-vinyl acetate copolymer, ethylene -Ethyl acrylate copolymer and the like can be mentioned.

The thermoplastic resin film or sheet of the present invention is composed of a single layer structure, a laminated structure or the like using the above thermoplastic resin. As a specific example of the structure of the laminated film, a film made of the above polyolefin-based resin is used as the inner and outer layers, and polyester and polyamide are used as the core layer.
A laminated film using a thermoplastic resin such as a saponified product of an ethylene-vinyl acetate copolymer may be used.

Examples of the belt-like material used in the present invention include a film or sheet made of the thermoplastic resin, an unstretched or stretched tape-shaped material made of the thermoplastic resin, a band, and a chuck tape made of a thermoplastic resin. These are thermoplastic resin films or sheets for reinforcement of the opening of the bag, auxiliary function of the opening, decoration of the bag, easy transportation, etc. by heat sealing to the inside / outside of the opening of the bag. A resin bag with a zipper, a bag with a handle, and the like are formed.

The thermoplastic resin used for the strip is
Although not particularly limited, it is preferable to combine resins having the same type or affinity with the thermoplastic resin forming the film, sheet, bag or the like.

The surface treatment of the present invention means corona discharge treatment,
Examples thereof include ultraviolet treatment and ozone treatment. The wet tension of these surface treatments is preferably 42 dyne / cm or more, more preferably 45 dyne / cm or more. If the wetting tension is less than 42 dyne / cm, the non-fused portion cannot be formed during heat sealing, and the entire portion is fused, so that the effect of the present invention cannot be obtained. Among the above-mentioned means for surface treatment, the corona discharge treatment is most preferable from the viewpoints of effect, economy and the like.
The condition of the corona discharge treatment is not particularly limited, but the strength is 5 to 40 W · min / m ² , preferably 1
It is 5 to 30 W · min / m ² , and the atmosphere in which the corona discharge treatment is performed may be air or an inert gas atmosphere.

In the present invention, with respect to the resin component, if necessary, an antistatic agent, an antifogging agent, an organic or inorganic filler, an antioxidant, a lubricant, an organic or inorganic pigment, an ultraviolet absorber, a dispersant, a nucleus. Known additives such as agents, foaming agents and cross-linking agents can be added within a range that does not essentially impair the characteristics of the present invention.

[0013]

The heat-sealing method of the present invention is applied to a portion to be left as a non-fusing portion in heat-sealing a multiplex of a thermoplastic resin film or sheet, formation of a bag reinforcing portion, and a multiplex such as a bag with a zipper. When the bag and the belt-shaped body such as a zipper tape are overlapped and heat-sealed by performing a surface treatment such as corona discharge treatment over a specific wetting tension, the bag and the belt-shaped body are fused and the surface treatment is performed. Since the melting point of the resin becomes high on the surface of the applied strips, the effect that the strips are not fused to each other can be provided. Therefore, a method of removing cellophane paper, release paper, etc. after heat sealing by pasting cellophane paper, release paper, etc. on the place that you want to leave as a non-fusing part, which was conventionally required, or a media treatment of applying a special varnish etc. Complex processing such as is unnecessary, and productivity and economic efficiency can be remarkably improved.

An embodiment of the present invention will be described in more detail below with reference to the drawings. FIG. 1 is a perspective view showing an example of a method for heat-sealing a multiplex body of a film of the first invention of the present invention. A film multiplex body 1a in which two surfaces of the film 2a, which has been subjected to a corona discharge treatment in advance on one surface 3a of the end portion which is the non-fused portion, are arranged so that the surface subjected to the corona discharge treatment is the outside and the surface not subjected to the corona discharge treatment is the inside Similarly, 2 of the film 2b, which has been subjected to corona discharge treatment in advance on one surface 3b of the end portion which becomes the non-fused portion,
The corona discharge treated ends of the sheets 3a and 3 are overlapped with the film multiplex body 1b, with the corona discharge treated surface facing outward and the surface not subjected to corona discharge treatment facing inside.
When b is heat-sealed with a heat seal bar or the like, the inner surfaces (4a and 4a, and 4b and 4b that are not subjected to corona discharge treatment) are heat-sealed, and the multiplex body 1a and the multiplex body 1b are not fused,
A large number of films can be heat-sealed with one heat-sealing. In the case of applying the heat-sealing method from the film or sheet to make a bag, by heat-sealing the corona discharge-treated surfaces to each other, a large number of sheets are heat-sealed at a time to make a bag. It becomes possible to do. Although the above embodiment is applied to a multiplex of films, a combination of a sheet and a tape or the like may be used and is not particularly limited.

FIG. 2 (a) is a perspective view of a bag with a string of the first example in which the heat-sealing method of the second invention of the present invention is applied to the bag made of a film or a sheet. That is, the mouth portion of the bag body 10 made of the thermoplastic resin film 11 is folded back, and the inner surface of the bag body to be the non-fused portion is surface-treated by corona discharge treatment or the like, and then the seal portion 12 at the folded end is heat-fused. Then, by forming the string through hole 13, a bag with a string through which the string 14 is passed can be manufactured. Further, FIG. 2B shows a sectional view of the stringed bag of the first example.

FIG. 3 shows a second example of the second invention of the present invention, which is a partially enlarged perspective view of the reinforcing bag. The mouth portion of the bag body 10a is folded back and the inside of the bag which is to be the non-fusing portion is subjected to corona discharge treatment in advance, and the folded portion is heat-fused from the outside of the bag to form the seal portion 12a to reinforce the mouth portion. It is possible to 11a is a thermoplastic resin film.

4 (a) and 4 (b) show a second embodiment of the present invention.
It is a partially expanded perspective view of the reinforcing bag body using the tape-shaped strip | belt-shaped body of the 2nd example of invention. FIG. 4 (a) shows a case in which a reinforcing tape 22a is attached to the outside of the opening of a bag body 20a made of a thermoplastic resin film 21a, and the inside of the bag 23a desired to be the non-fusion-bonded portion is previously subjected to corona discharge treatment. After that, the reinforcing tape 22a and the bag body 20a are heat-sealed to form a seal portion 22c to reinforce the opening.
(B) shows a reinforcing tape 22b stuck inside the opening of a bag 20b made of a thermoplastic resin film 21b. The inner surface 23b of the reinforcing tape 22b is previously corona-discharge treated and then the reinforcing tape. 22b and the bag body 20b are heat-sealed to form a seal portion 22c to reinforce the opening portion.

FIG. 5 (a) is an enlarged cross-sectional view of the zipper bag body in which the zipper tape of the third example of the second invention of the present invention is fused, and shows a zipper bag body made of the film 31. 30 is a hook-shaped male nail 4 as shown in FIG.
1. A pair of zipper tapes 40 having female claws 42 provided in parallel with No. 1 are fused to the inner surface of the bag. When the zipper tape is fused to the upper part of the bag body, the zipper tape of the seal portion 32 is formed. The inner surface of the bag 40 is previously subjected to corona discharge treatment to form the non-fusing portion 33, and then the inner surface of the bag body 30 and the outer surface of the zipper tape 40 are heat-fused by a heat fusing means such as a heat seal bar. And are thermally fused, and the corona discharge treatment portion 33 on the inner surface of the zipper tape 40 is not fused. The thermoplastic resin chuck consisting of the male and female claws may be formed in one or more rows above and below the bag opening,
In the case of a plurality of rows, the male and female nails may be arranged in parallel in the same direction, or the male and female nails may be alternately arranged at opposite positions. Further, as shown in FIG. 5 as an example, by providing a plurality of ridge sealing members 43 made of silicon rubber or soft urethane on a part of the inner wall of the female claw, the male claw is fitted when the male claw is fitted with the female claw. The tip of the ridge seal material 43
The airtightness can be improved even for gas or liquid contents.

FIG. 6 is a partially enlarged view showing an example of a heat sealing method of fusing a zipper tape to a bag. The zipper tapes 40, 40 each having a non-fused part 33 formed by corona discharge treatment in advance are arranged between the films 31, 31 near the opening of the bag body to form the heat seal bar 5.
1, 51 are the corona discharge treatment parts 33 of the zipper tape 40
The inner surface of the film 31 and the outer surface of the zipper tape 40 are heat-sealed to each other by pressing onto the portion corresponding to
2, 32 are formed. On the other hand, the non-fusing part 33 of the zipper tape 40 is a zipper bag that can be opened and closed again without being heat-fused. Further, the heat fusion means is not particularly limited, such as a heat seal bar method, a heat roll method, an infrared lamp method, a high frequency method, an ultrasonic method, and a laser beam method.

The bag of the present invention may be a thermoplastic resin single layer film, a laminated film, a laminated film or the like. The material of the zipper tape used above is not particularly limited, but a polyolefin resin is preferably used. Specifically, high-medium low density polyethylene, linear low density polyethylene, ultra low density polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, etc. Alternatively, a mixture thereof or the like is used. It is desirable to use the same material as the material of the bag body. Further, the male nail and the female nail can be used by combining two kinds of hard and soft resins.

[0021]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. (Example 1) Linear low-density polyethylene (density = 0.92
2 g / cm ³ , MFR = 0.5 g / 10 min, trade name: Nisseki Linirex, BF1350, manufactured by Nippon Petrochemical Co., Ltd., an inflation film molding machine (screw diameter 60 mm, L / D = 30 single screw extruder) ), Molding temperature 2
80 μm thickness under conditions of 00 ° C and blow-up ratio of 2.0
The inflation film was molded, and the bottom of the inflation film was heat-sealed to obtain a bag. On the other hand, low density polyethylene (Density = 0.924 g /
cm ³ , MFR = 5.0 g / 10 minutes, trade name: Nisseki Lexlon, F41, manufactured by Nippon Petrochemical Co., Ltd.
After forming a zipper tape having male and female claws formed through a T-die having a concave hole provided so that each hook-shaped male and female claws are formed in parallel on the same plane, the male and female claws are formed. Corona discharge intensity of 30W ・ min / m on the surface formed by
² 、 Corona discharge treatment in air, wetting tension 50 dy
A zipper tape made of a thermoplastic resin of ne / cm was manufactured. Height of male and female nails of the zipper tape is 1.8 m
m, hook width of male claw is 1.6 mm, hook width of female claw is 2.7 m
m, the tape thickness was 0.2 mm, and the tape width was 55 mm. The thermoplastic resin zipper tape thus obtained was cut into a bag width, and as shown in FIG. 6, the zipper tape cut was opposed so that the male and female claws would engage each other, and the inflation The films were arranged in the opening of the bag body and heat-sealed under the conditions of a heat-sealing pressure bonding width of 5 mm, a heat-sealing pressure of 2 kgf / cm ² , and a heat-sealing time of 1 second. In the obtained bag with a zipper, the bag film and the zipper tape were heat-sealed, but the corona discharge treated surfaces of the zipper tapes were not melted, and the zipper bag was a resealable zipper bag. It was The results are shown in Table 1. The thermoplastic resin zipper bag thus formed has a function of taking out and storing a necessary amount of contents by opening and closing the zipper.

(Embodiment 2) Corona discharge treatment is applied to a portion of the zipper tape which is to be the non-fusing portion, and the wetting tension is 46 dy.
The same procedure as in Example 1 was carried out except that ne / cm was set. In the obtained bag, the bag base material film and the thermoplastic resin zipper tape are fused, but the thermoplastic resin zipper tapes which are the corona discharge treated surfaces are not fused and can be opened and closed again. It was a bag. Table 1 shows the obtained results.

COMPARATIVE EXAMPLE 1 Corona discharge treatment was applied to the chuck forming surface of the chuck tape to obtain a surface treatment degree of wetting tension of 40.
The same procedure as in Example 1 was carried out except that dyne / cm was used. In the obtained bag, the bag base film and the thermoplastic resin zipper tape are fused, and the thermoplastic resin zipper tapes which are the corona discharge treated surfaces are also fused to obtain a re-openable and closable bag. It was a problem for practical use. Table 1 shows the obtained results.

(Comparative Example 2) The zipper-formed surface of the zipper tape was subjected to corona discharge treatment to obtain a surface treatment degree of wet tension 37.
The same procedure as in Example 1 was carried out except that dyne / cm was used. In the obtained bag, the bag base film and the thermoplastic resin zipper tape are fused, and the thermoplastic resin zipper tapes which are the corona discharge treated surfaces are also fused to obtain a re-openable and closable bag. It was a problem for practical use. Table 1 shows the obtained results.

(Comparative Example 3) The same procedure as in Example 1 was carried out except that the chuck forming surface of the chuck tape was not subjected to corona discharge treatment. In the obtained bag body, the film of the bag body, the thermoplastic resin zipper tape, and the thermoplastic resin zipper tape were fused together. Table 1 shows the obtained results.

[0026]

[Table 1]

[0027]

INDUSTRIAL APPLICABILITY In the present invention, when heat-sealing a multiplex body containing a thermoplastic resin film or sheet, heat-sealing is carried out by surface-treating a portion to be left as a non-fused portion which is not desired to be heat-sealed. It is possible to simultaneously produce a fused surface and a non-fused surface. When fusing thermoplastic resin films or sheets to each other, or fusing the opening of a bag with a thermoplastic resin zipper tape, reinforcing tape or other strip-shaped body and forming a non-fusing surface, cellophane paper, release paper, etc. It is possible to form a bag body with a chuck, a bag with a handle, a decorative band, etc. without using.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a heat sealing method for a multiplex body of the present invention.

FIG. 2 (a) is a perspective view of a bag with a string according to a first example in which the heat-sealing method of the present invention is applied to a bag made of a film or a sheet, and FIG. 2 (b) is a sectional view of the bag with a string. Is.

FIG. 3 is a partially enlarged perspective view of a reinforcing bag, which is a second example to which the heat-sealing method of the present invention is applied.

4A and 4B are partially enlarged perspective views of a reinforcing bag body using a tape-shaped belt-shaped body, which is a third example to which the heat-sealing method of the present invention is applied.

FIG. 5A is an enlarged cross-sectional view of a zipper bag that is a fourth example to which the heat-sealing method of the present invention is applied, and a zipper tape is fused, and FIG. 5B is an enlarged zipper tape. It is a figure.

FIG. 6 shows an example of a heat sealing method of fusing a zipper tape to a bag body.

[Explanation of symbols]

1a, 1b Multiplexed body made of thermoplastic resin film or sheet 2a, 2b Thermoplastic resin film 3a, 3b Corona discharge treated surface 4a, 4b Heat seal part (fusion surface) 10, 10a Bag body 11, 11a Thermoplastic resin film 12, 12a Heat seal part (fusing surface) 13 String through hole 14 Strings 20a, 20b Reinforcing band bag 21a, 21b Films 22a, 22b Reinforcing tape 22c Seal part 23a, 23b Corona discharge treatment part 30 Chuck bag 31 film 32 heat seal part (fusing surface) 33 corona discharge treatment part 40 chuck tape 41 hook type male claw 42 concave female claw 43 sealing material 50 heat sealing direction 51 heat seal bar

Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location B29L 22:00

Claims (4)

[Claims] 1. When heat-sealing a multiplex body containing a thermoplastic resin film or sheet, the non-fusion-bonded portion of the multiplex body is surface-treated to have a wetting tension of 42 dynes / cm or more, and then the heat fusion is performed. A heat-sealing method for a multiplex body characterized by wearing. 2. An inner surface of a bag which is a non-fusing part when the band-shaped body is heat-fused to the folded part of the opening of the bag or the inner surface and / or the outer surface of the opening made of a thermoplastic resin film or sheet. Alternatively, the inner surface of the strip is wet with tension 42
A heat-sealing method for a multiple body, which comprises subjecting a contact surface between a bag and a belt-like body to heat fusion after surface treatment to a dyne / cm or more. 3. The heat-sealing method for a multiplex body according to claim 2, wherein the band-shaped body is a chuck tape made of a thermoplastic resin. 4. The heat sealing method for a multiplex body according to claim 1, wherein the surface treatment is a corona discharge treatment, an ultraviolet treatment, or an ozone treatment. .