JPH06299454A - Thermally press-bonded composite and its production and formed product produced therefrom - Google Patents

Abstract

PURPOSE:To provide a composite suitable as a packaging material for foods, horticultural products, medical treatment materials, clothing, etc., by thermally press-bonding a film or metal foil to thermally press-bonding nonwoven fabric consisting mainly of copolyester conjugate fibers. CONSTITUTION:40-95% of sheath-type conjugate fibers comprising a copolyester in the sheath parts and a regular polyester in the core parts are mixed with pulped vegetable fibers, fine denier polyester fibers or synthetic pulp, and the mixture is processed into thermally press-bonding nonwoven fabric. The nonwoven fabric is thermally press-bonded to a film or metal foil to form a composite good in shape retainability, which is processed into bags, thus providing packaging materials excellent in light-screening property, airtightness, impact resistance, antimagnetic characteristics, and moistureproofness.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite body which can be formed into a bag by thermocompression bonding a nonwoven fabric to one or both sides of an aluminum foil, a gold foil, a vapor deposition film or a polyester film by thermocompression bonding. It can be used as a packaging material for food, a packaging material for horticulture, a packaging material for pharmaceuticals, a packaging material for clothing, as well as a gold foil as a gold and silver thread, and a backing for a vapor deposition film.

[0002]

2. Description of the Related Art Conventionally, when laminating an aluminum foil or a vapor-deposited film and a non-woven fabric, various adhesives such as a urethane adhesive, a vinyl acetate adhesive, and an acrylic adhesive are attached to the aluminum foil or the vapor-deposited film side. Or the non-woven fabric side is coated and laminated and then dried to form a composite.

Alternatively, a polyolefin-based or EVA-based resin is extracted and laminated, and an aluminum foil or a vapor-deposited film and a non-woven fabric are attached by a sand laminating method.
Further, there is a technique in which a polyolefin-based or EVA-based film is used as an adhesive to bond an aluminum foil, or a vapor deposition film and a non-woven fabric are bonded together by heat.

Further, various kinds of adhesives are used for making a bag. Also, for gold and silver threads, in order to improve the dimensional stability of the vapor-deposited polyester film, Japanese paper is pasted with a urethane adhesive as a backing.

As described above, in the conventional technique, various adhesives are used for the composite of the metal foil or the non-woven fabric of various films, and the process at the time of processing is long and the cost is high. Furthermore, the non-woven fabric used also needs to have strength to withstand the tension of the process, which limits the basis weight. In the case of aluminum foil,
Although it has a feature that its shape is easily deformed by an external force and follows the object well, it has a unique luster and is difficult to use for design purposes such as flower wrapping.

As the thermocompression-bondable non-woven fabric, polyethylene fibers, polypropylene fibers, etc. are mixed as thermoplastic fibers, or a single non-woven fabric is used for tea bag base paper, kitchen drainer base paper, etc. Weak metal foil with a sealing strength of 30g / 15mm width or less, or
Thermocompression bonding with the film was difficult.

[0007]

SUMMARY OF THE INVENTION The present invention eliminates the adhesive used when laminating a metal foil or film to a non-woven fabric and attaches a non-woven fabric having a strong heat seal strength to the metal foil or the film by thermocompression bonding. It is intended to provide a thermocompression-bonded composite body, a method for manufacturing the same, and a thermocompression-bonded composite body in which the laminated body laminated is heat-sealed into a bag shape.

[0008]

In order to solve the above problems, the gist of the invention of claim 1 is that a non-woven fabric comprising a copolyester conjugate fiber as a main fiber is formed into a composite by thermocompression bonding.

The gist of the second aspect of the present invention is that a non-woven fabric composed mainly of copolyester conjugate fibers is thermocompression bonded. The gist of the invention of claim 3 is to make a non-woven fabric whose main fiber is a copolyester conjugate fiber having thermocompression bonding property, and thermocompression-bond the non-woven fabric to a film or a metal foil.

According to the fourth aspect of the present invention, the shape-retaining property is obtained by thermocompression-bonding a non-woven fabric thin layer article capable of thermocompression bonding to a thin layer article which changes its shape by an external force and can retain at least the shape when the external force is removed. The main point is to have.

A fifth aspect of the present invention is summarized in that in the thermocompression-bonded composite according to any one of the first, second and fourth aspects, the content of the copolyester conjugate fiber is 40% to 95%. There is.

A sixth aspect of the present invention is characterized in that the non-woven fabric according to the fifth aspect is thermocompression bonded to one side or both sides of a metal foil or film, and is further formed into a bag shape by thermocompression bonding.

[0013]

According to the present invention, the non-woven fabric containing the copolyester conjugate fiber as the main fiber can be easily thermocompression bonded to the metal foil or various films by the heat pressure of the heat calender roll, the heat embossing roll, the heat press, etc. Become. When pasting with a conventional adhesive, it is difficult to attach a thin non-woven fabric of about 10 g / m ² because the adhesive applying step, the drying step and the steps are long, and further, the strength to withstand the tension of the step is required. Furthermore, wrinkles after drying when using adhesive,
There are problems with tarmi and curl, and the cost is high.

Further, in the case of making a bag by using a pasted product with an adhesive, a bag is made with an adhesive or a polyolefin-based laminate is made and heat-sealing is used. However, in this invention, if the copolyester conjugate fiber is used as the main fiber for thermocompression bonding, the process can be pasted only with a heat roll or the like, and the cost is reduced, and there are wrinkles, talmis, and curl problems compared with the use of an adhesive. It disappears and becomes good in appearance. Further, since the bonding can be performed only by the thermocompression bonding step, a non-woven fabric having a weak strength of about 10 g / m ² can be used. Since the nonwoven fabric itself has a heat-sealing property, bag-making can be easily performed by thermocompression bonding without an adhesive.

Further, in the case of gold thread and silver thread, conventionally, in order to stabilize the elongation dimension of the polyester vapor deposition film, an adhesive is used to bond the polyester vapor deposition film and Japanese paper,
Further, it is used as a matte gold and silver thread that has been subjected to hot embossing roll treatment. On the other hand, according to the present invention, the bonding can be performed only by the hot embossing roll treatment, and the working process can be greatly simplified. Needless to say, dimensional stability of elongation can be achieved as in the case of conventional Japanese paper bonding.

The method for producing the thermocompression-bonded composite of the present invention will be described in detail below step by step. In the present invention, the copolyester conjugate fiber having thermocompression bonding is used as the first fiber, and is 40 to 95%, and the remaining second fiber is 60 to 5
%. As the second fiber, as a vegetable fiber, there are three tsubaki,
Of bast fibers such as mulberry and geese, plant bast fibers such as flax and kenaf, leaf fibers such as Manila hemp and sisal, pulped and bleached fibers selected from cotton, linter, conifer and hardwood, and polyester fine denier Fibers such as fibers and synthetic pulps can be used alone or as a mixture.

When the content of the first fiber is 40% or less, the thermocompression bonding strength with the metal foil or various films is weak, it easily peels off, and is practically unbearable. Further, if it is 95% or more, the formation of the web is not good in the non-woven fabric manufacturing process, and the transition to the drying process is poor. In addition, the thickness of the fiber is preferably 5D or less due to the smoothness of the nonwoven fabric, and the length is preferably within the range of 1 to 10 mm due to the uniformity.

After the first fiber and the second fiber are uniformly mixed, a wet paper machine is used to make a non-woven fabric, which is then bonded to a metal foil or various films by a thermocompression bonding method. It is the body.

[0019]

EXAMPLES Examples of the present invention will be described in detail below. (First embodiment) In this embodiment, wood pulp (N-BKP)
Was adjusted to Cf600 (Canadian standard freeness) with a beater, and then the copolyester composite fiber 2D × 5 mm (in this example, the copolyester composite fiber was core = regular polyester 1D, sheath = modified polyester 1D).
The core-sheath structure was used. ) And 1: 9, and then chemicals such as an antifoaming agent and a sticky agent were added to the paper using a gauze paper machine. Drying was performed with a drum dryer at 125 ° C. which is 110 ° C. or higher of the melting point of the sheath of the copolyester composite fiber, and a thermocompression bonded nonwoven fabric of 10 g / m ² was produced. Using a calender, temperature 130 ° C, speed 5m / min, pressure 20Kg / c
Thermocompression bonding was performed at m ² .

As a result of pasting the non-woven fabric on the front and back of the aluminum foil, when it was used for flower wrapping, the luster of the aluminum foil, that is, the glare on the surface disappeared.
The shape could be deformed by an external force, and the feature that fits the object well was added. In addition, it is of course possible that the shape of the wrapping can be freely changed.

(Second Embodiment) In this embodiment, as a two-layer papermaking process, the surface is 2D × 5 mm 90% of the copolyester conjugate fiber of the first embodiment and 10 g / m of pulp 10%.
² , the back side was made of 80% pulp, 2D × 5 mm of copolyester composite fiber, 20%, and 10 g / m ² to prepare a non-woven fabric. Further, a heat-embossing roll is used so that the vapor-deposited polyester film of gold and silver and the surface of the nonwoven fabric face each other, and the temperature is 130 ° C. and the speed is 7 m / mi.
Thermocompression bonding was carried out at a pressure of 20 kg / m ² . As a result, it was possible to produce gold-silver yarns whose elongation was controlled in the same manner as gold and silver yarns in which washi was pasted with a conventional adhesive. By adopting a two-layer structure, adhesion to the heat roll surface could be prevented.

(Third Example) The thermocompression bonded non-woven fabric of the first example was bonded to a gold foil with a heat roller. The conventional gold foil is stretched to a very thin thickness of 0.1 μ by performing foil stamping, but it has no strength and is easily broken, and in the case of a 16 m square foil, the ears are removed.

According to the present invention, since it can be used as a backing paper of gold foil, the ears can also be thermocompression-bonded and can be heat-sealed, so that it can be attached to various interiors without an adhesive. Also, although gold foil has the drawback of being easily broken, it can be used for various interiors because it can be reinforced with thermocompression bonded non-woven fabric and the ears etc. can be retained in shape.

(Fourth Embodiment) In this embodiment, various non-woven fabrics in which the amount of the copolyester fiber composite fibers and the pulp are changed step by step are prepared and thermocompression-bonded with an aluminum foil (180 ° C. × 3).
Kg / m ² × 2 seconds) and the bonding strength was measured.
The nonwoven fabric was 30 g / m ² .

[0025]

[Table 1]

Next, as a comparative example, 80% of polyolefin-based composite fiber (PP for core, polyethylene for sheath) and 20% of synthetic pulp are mixed to prepare a nonwoven fabric of 30 g / m ² , which is thermocompression-bonded with an aluminum foil and laminated. The combined strength was measured. As a result, adhesion was impossible.

According to the present example, the copolyester composite fiber was weak at a bonding strength of 30 g / 15 mm width when it was 40% or less, and the strength which could be practically used could not be obtained unless it was mixed in 40% or more.

[0028]

As described in detail above, the thermocompression-bonded composite of the present invention can be easily made into a bag by combining it with a metal foil, and is excellent in light-shielding property, airtightness, impact resistance and magnetic resistance. Moreover, since the gold thread and the silver thread can be bonded only by the hot embossing roll without an adhesive, the process can be greatly simplified and the cost can be reduced.

According to the composite of the present invention, it can be widely used according to the application without using a conventional adhesive. Further, since the bag-shaped molded product can retain moisture resistance because it is a film or a composite of metal foil, it is applicable as a packaging material for food, gardening, medical, clothing, etc. Will be wide.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Satoshi Shimada 422 Maeno, Mino City, Gifu Prefecture Daifuku Paper Manufacturing Co., Ltd.

Claims (6)

[Claims] 1. A thermocompression-bonded composite in which a metal foil is bonded by thermocompression bonding to a nonwoven fabric composed mainly of copolyester composite fibers. 2. A thermocompression-bonded composite in which a film is bonded by thermocompression bonding to a non-woven fabric mainly composed of copolyester composite fibers. 3. A method for producing a thermocompression-bonded composite, which comprises making a non-woven fabric having thermocompression-bondable copolyester composite fibers as a main fiber, and thermocompressing the non-woven fabric to a film or a metal foil. . 4. A shape-retaining property, wherein a thermocompression-bondable nonwoven fabric thin-layer article is thermocompression-bonded to a thin-layer article capable of changing its shape by an external force and at least partially retaining the shape when the external force is removed. Complex. 5. The content of the copolymerized polyester conjugate fiber is 40 to 95%, and
4. The thermocompression bonded assembly according to any one of 4 above. 6. A molded product obtained by thermocompression-bonding the non-woven fabric according to claim 5 on one side or both sides of a metal foil or film, and further forming a bag by thermocompression-bonding.