JPH0261380B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a laminate in which various powdery substances are enclosed between a breathable fibrous base material and a surface material. This is a method for manufacturing a laminate that can be easily encapsulated in various shapes using a method.

Conventionally, there have been major drawbacks when enclosing powdered materials between sheet base materials by a scattering method. In other words,
If an adhesive part is provided in advance and a powder is sprinkled over the entire area, the adhesive part will also be covered with the powder and the adhesive will be completely lost, making it difficult to achieve a complete seal.

There is a problem in that it is extremely difficult to continuously spread the powder to only a certain enclosed area.

As a result of various studies to solve these problems, the inventors of the present invention found that by providing an impermeable adhesive part in advance and spraying the powder, or by applying suction treatment after spraying. The present invention was completed based on the discovery that the powder easily gathers only in the enclosing part and does not remain in the adhesive part.

That is, the present invention provides an air-impermeable and non-adhesive adhesive area on the upper surface of an air-permeable fibrous base material, except for a desired air-permeable enclosing part, and sprinkles a powder on the upper surface of the base material. After applying suction treatment from the bottom surface of the base material,
This method of manufacturing a laminate is characterized in that a surface material is placed on the upper surface of the base material and integrated by thermocompression bonding.

The breathable fibrous base material in the present invention includes woven fabrics, knitted fabrics, non-woven fabrics, paper-like materials, etc., and may be selected depending on the application. All you have to do is select. On the other hand, as the surface material, air-permeable woven fabrics, knitted fabrics, non-woven fabrics, paper-like materials, etc. are used, but it goes without saying that materials such as impermeable films may be used depending on the purpose.

The adhesive portion provided on the above-mentioned breathable fibrous base material is formed using a general adhesive. These adhesives include various types such as acrylate-based, ethylene-vinyl acetate-based, polyethylene-based, polyamide-based synthetic resin emulsion-based, solvent-based, and hot melt-based adhesives, as well as synthetic rubber-based latex and other types. is used. An impermeable bonded portion is formed by applying these adhesives using a roll printing machine or the like to form a continuous linear pattern. Furthermore, although it is good to perform a drying treatment or the like to make the adhesive part non-adhesive, it is not preferable to perform a heat treatment or the like which would cause the adhesive property to be lost.

Therefore, it is more preferable to use a hot melt type adhesive because it becomes non-tacky if it is cooled to room temperature after application.

Such an adhesive portion may have a width of 1 mm or more, preferably 3 to 10 mm, and may have any pattern such as a continuous linear shape capable of enclosing a powdery material such as a lattice shape, a diamond shape, or an arc shape.

However, if you use discontinuous linear, dotted, or island-like patterns in combination with such a continuous arbitrary pattern, the number of bonded areas can be increased as desired, thereby increasing the adhesive strength. You can get something expensive.

An impermeable and non-adhesive adhesive portion is formed on the upper surface of such an air-permeable fibrous base material, and a powder is sprinkled on the upper surface of the base material.

Powder materials used here include activated carbon powder and zeolite powder that have deodorizing and adsorption properties, water-absorbing polymer powder and silica gel powder that have water-absorbing properties, silica gel powder, pulp powder, synthetic polymer powder that has oil-absorbing properties, etc. There are powders with various characteristics, such as short fibers and kapoku fibers, which can be selected depending on the application.

Therefore, the powder mentioned here can range from extremely fine to quite coarse, preferably from a few microns to several thousand microns, but it can also be close to fibrous, and depending on the purpose, it can be powdered. A mixture of short fibers and short fibers can also be used, but is not limited thereto.

Next, scattering as used in the present invention does not mean simply dropping the powder in the hopper using a grooved roll, etc., but also means dispersing the powder uniformly using a stirring blade etc. and depositing it, This also includes those that are deposited by air flow after opening, as long as they are similar to the above.

The powder dispersed using these methods is suctioned from the bottom surface of the substrate, but the powder in the air-permeable enclosure is retained between the fibers of the substrate and on the substrate. It is sufficient as long as it is of a certain extent. On the other hand, powdery substances within the impermeable and non-adhesive bonded area are collected within the enclosure by suction from the periphery of the enclosure. As a result, a state in which no powder remains at all within the bonded portion is obtained.

In addition, the suction treatment may be performed at the same time as the spraying,
It goes without saying that in continuous production, it may be applied a little later than the time of spraying.

The above-mentioned surface material may be placed on the upper surface of the base material that has been treated in this way, and the entire surface may be thermocompression bonded using a calendar roll, etc., or it may be thermocompression bonded partially using an embossing roll, etc. . In this way, the adhesiveness of the bonded portion is developed, and the base material and the surface material are integrated to obtain a laminate.

The powdery substance encapsulated in this way is sufficiently retained within the enclosing part, and furthermore, movement of the powdery substance can be prevented. Furthermore, the laminate of the present invention can be used for various purposes by selecting the powdery material.

Example 1 On the upper surface of a nonwoven fabric made of polyester fibers having a basis weight of 30 g/m ² , linear impermeable and non-adhesive bonded areas with a width of 3 mm were provided in a lattice pattern using a polyamide resin adhesive. On top of this, pulp powder and highly water-absorbent starch-acrylate graft copolymer powder are added at 70:
While spraying 70g/m ² of the mixture at a ratio of 30%, suction treatment was applied from the bottom. Furthermore, a nonwoven fabric made of polyester fibers having the same basis weight as above and having a basis weight of 30 g/m ² was layered thereon, and the entire surface was thermocompression bonded using a thermal calendar at 150° C. to obtain an integrated laminate. This laminate was suitable as a dew condensation prevention sheet for containers and the like.

Example ² A linear impermeable and non-adhesive bonding portion with a width of 1 mm was provided in a rhombic shape using ethylene-vinyl acetate copolymer resin on the upper surface of a nonwoven fabric made of polyester fibers having a basis weight of 50 g/m 2 .

A mixture of pulp powder, activated carbon powder, and highly water-absorbent polyacrylate powder in a ratio of 70:10:20 (80 g/m ^{2 )} was sprinkled on top of this while suction was applied from the bottom surface. Further, a nonwoven fabric laminated with a polyethylene film was layered on top of this, and the nonwoven fabric was partially thermocompressed using an embossing roll at 140°C to obtain an integrated laminate. This laminate was ideal as a leak-proof sheet with excellent water absorption and deodorizing effects.

According to the method of the present invention, an air-impermeable and non-adhesive adhesive part is provided in advance on the air-permeable fibrous base material, and then various powders are sprinkled on the air-permeable fibrous base material. Powder-like substances collect only in the air-permeable encapsulation part and do not remain in the adhesive part, and are completely encapsulated, so that the encapsulated powder-like substances do not spill out.

In other words, according to the present invention, a laminate of extremely stable quality can be easily obtained continuously. Such a laminate is suitable for various uses such as oil-absorbing sheets, deodorizing sheets, quilting sheets, etc. by incorporating various powders in addition to the above-mentioned dew-condensation prevention sheets and leak-proof sheets.

Claims (1)

[Claims] 1. An impermeable and non-adhesive adhesive area is provided on the upper surface of an air-permeable fibrous base material, except for the desired air-permeable enclosing part, and a powder is sprinkled on the upper surface of the base material, and at the same time, a powder is applied from the bottom surface of the base material. 1. A method for manufacturing a laminate, which comprises performing a suction treatment, placing a surface material on the upper surface of the base material, and performing an integration treatment by thermocompression bonding.