JP2001271273A - Method for forming latex layer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for continuously forming a flexible latex layer on a substrate to be formed such as a cloth, etc. SOLUTION: This method for forming the latex layer is characterized by comprising a process of spraying a latex solution 1 to the substrate 2 to attach a latex-coagulating agent on its surface. Since the latex solution is sprayed as a shower state and there is no time for the latex solution to penetrate into seams, etc., different from the case of immersion, there is an advantage of forming the flexible latex layer on the surface of the substrate, and also it is possible to form the latex layer on the surfaces of plural substrates continuously by conveying the substrates to the shower of the latex solution continuously and spraying.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for forming a latex layer, and more particularly to a method for easily and continuously forming a large amount of a latex layer on a surface of a cloth or the like.

[0002]

2. Description of the Related Art Conventionally, an object to be formed, for example, a cloth,
As a typical method for forming a latex layer on the surface of a bag or the like, as shown in FIG. A latex coagulant is allowed to adhere to the surface of the formed article 2. Next, the object 2 is taken out of the latex coagulant solution 1 and immersed in a latex solution 3 to form a latex layer 4 on the surface of the object 2.

In such a method, the thickness and the like of the latex layer 4 are controlled by the temperature of the latex solution 3 to be immersed, the time for immersing the object 2 to be formed, and the like. In the case where the object 2 is a cloth or a cloth-like bag, if the temperature and the immersion time of the latex solution 3 are controlled as described above,
While there is an advantage that the latex layer 4 having a desired thickness can be easily obtained, there is a disadvantage that the latex solution 3 penetrates into the textures and fibers of the cloth and solidifies.

[0004] When the latex layer 4 is formed by infiltrating into a texture or the like and solidifying to form the latex layer 4, the peel strength between the cloth and the latex layer 4 becomes good, but there is a disadvantage that flexibility is lost. Products having a latex layer 4 formed on a cloth are often required to be soft and have a good touch, such as air mats and water beds, and in the above-described method, a sufficiently flexible product is manufactured. There was a drawback that it was difficult to do. Further, it is difficult to continuously immerse in the latex solution, and there is a drawback that a large amount of productivity is required.

The present invention has been made in view of the above problems, and has as its object to provide a method for continuously producing a flexible latex layer on an object to be formed such as cloth.

[0006]

Means for Solving the Problems In order to solve the above problems, the method for forming a latex layer according to the present invention comprises a step of spraying a latex solution onto a substrate having a latex coagulant adhered to its surface. It is characterized by.

According to the present invention, since the latex solution is sprayed in the form of a shower, unlike the case of dipping, there is no time for the latex solution to penetrate into a texture or the like, and a flexible latex layer can be formed on the surface of the workpiece. There is an advantage.
Further, if the object is continuously conveyed to the latex solution shower and sprayed, a latex layer can be continuously formed on a plurality of surfaces of the object.

The present invention will be described in more detail. In the present invention, a latex coagulant is first adhered to the workpiece 2. The method for adhering such a latex coagulant is not basically limited. For example, as shown in FIG. 4, the latex coagulant may be adhered by dipping in a latex coagulant solution 1, or as described later. Alternatively, a method of spraying the latex solution 3 of the present invention onto the workpiece 2 may be employed. That is, by spraying the latex coagulant solution 1 from the nozzle 61 using an apparatus as shown in FIG. 1, the latex coagulant can be attached to the surface of the workpiece 2. At this time, the latex coagulant can be continuously attached to the workpiece 2 by continuously passing the workpiece 2 between the nozzles 61.

As the coagulant in such a latex coagulant solution, basically any coagulant capable of coagulating the latex solution may be used. Typically, a polyvalent metal salt such as calcium nitrate is used. can do.

[0010] The substrate to which the latex coagulant is adhered is preferably a cloth as described above. This is because the latex solution easily penetrates into a texture or the like. As such a cloth-like body, for example, a three-dimensional woven cloth 5 as shown in FIG. 2 can be used. The three-dimensional woven fabric 5 includes an upper fabric 51.
And a lower cloth 52. The upper cloth 51 and the lower cloth 52 are connected by a plurality of connection threads 53. The ends of the upper cloth 51 and the lower cloth 52 of such a three-dimensional woven cloth are connected by sewing or the like to form a bag-like body, and the upper cloth 51 and the lower cloth 52 have a surface, an inner surface, and a connection thread 53 on the surface. A product such as an air mat or a water bed is manufactured by forming the latex layer 4 (for example, Japanese Patent Application No. 10-20 / 1990).
No. 6242) (see FIG. 3). By using the three-dimensional woven fabric in this manner, the connecting thread 53 provided with the latex layer 4 on the surface connects the upper and lower latex layers 4 to act as the support S for maintaining the shape or the strength of the product. Since there is no need to provide a separate support, the desired bag-shaped body can be easily manufactured, and since the strength depends on the connecting thread 53, there is an advantage that the bag-shaped body is easily designed.

[0011] A latex solution 4 is sprayed in a shower onto the workpiece 2 to which the latex coagulant has been attached. The method of spraying the latex solution 4 is as follows.
The present invention is not basically limited. For example, as shown in FIG. 1, the spraying can be performed by a device provided with a spraying table 6 having a plurality of nozzles 61 for blowing out a latex solution 4 in a shower shape at opposing positions.
The latex solution 4 can be sprayed on the surface of the workpiece 2 by passing the workpiece 2 between the nozzles 61. In this way, by continuously passing the workpiece between the nozzles 61, the workpiece 2 having the latex layer 4 formed on the surface can be continuously manufactured in large quantities.

The spray pressure of the latex solution 4 is preferably 0.5 to 1.5 kgf / cm ² . If it is less than 0.5 kgf / cm ² , the latex solution 4 may not sufficiently adhere to the surface of the workpiece 2 and may not form a good polymer layer 4.
When f / cm ² is exceeded, the latex solution 4
This is because there is a risk of penetration. The time for spraying the latex solution 4 is preferably 1 to 5 seconds. If the time is less than 1 second, a sufficient polymer layer may not be formed.
Spraying does not increase the thickness of the polymer layer 4 and is not economical.

[0013] Such a latex solution is not fundamentally limited in the present invention. For example, natural rubber, chloroprene rubber, SBR and the like can be used.

When the object 2 having the latex layer 4 formed on the surface is, for example, the above-described three-dimensional woven fabric 5, the polymer layer 7 can be provided on the inner surface of the three-dimensional woven fabric 5. Such a polymer layer 7 may be the latex layer 4 as described above, or may use another polymer. That is, the latex coagulant solution is injected into the bag-like body B (having the latex layer 4 formed on the outer surface) formed of the three-dimensional woven fabric 5, and the upper cloth 5
1, after the latex coagulant is adhered to the inner surface of the lower cloth 52, the latex coagulant solution is discharged, and then the latex solution is injected into the bag-like body B, whereby the upper cloth 51
A latex layer can be formed on the surface of the lower cloth 52 and the connection yarn 53.

Further, for example, a thermoplastic resin which solidifies by scattering a solvent can be used. As such a thermoplastic resin, a polyvinyl chloride (PVC) solution in methyl ethyl ketone (MEK) (P
VC / MEK) can be used. In this case, after injecting and discharging the thermoplastic resin solution into the bag-shaped body B, the solvent can be scattered to form a polymer layer.

It is also possible to produce a polymer layer using a two-part polymer. In this case, after one polymer forming solution is sufficiently adhered to the bag forming body B, the polymer forming solution is dried, and then the other polymer forming solution is adhered and cured by heat curing or the like. Thereby, the polymer layer 7 can be formed on the inner surface of the bag-like body and the surface of the connecting yarn 53. Such two-component polymers are not fundamentally limited. Basically, any polymer can be used as long as it forms a polymer by the reaction of two polymer forming liquids. Typically, a two-component polyurethane formed from diisocyanate and glycol, which are polymer-forming liquids, can be mentioned, and water and cyanoacrylate can also be mentioned.

In the case of forming the latex layer 4, the latex layer can be produced using a sol solution of a latex coagulant. A sol solution containing a coagulant instead of the coagulant solution was injected into the above-mentioned bag-like body surface, a gel layer was formed by cooling or the like, an excess sol solution was discharged, and a latex layer 4 was similarly formed. Thereafter, the gel layer is washed away to form a flexible latex layer 4. As such a sol solution of a latex coagulant, for example, a sol solution obtained by adding a latex coagulant to polyvinyl alcohol can be used. As a solvent for such a sol solution, for example, carboxymethyl cellulose or the like can be used in addition to the above-mentioned polyvinyl alcohol. Such a solvent is preferably water-soluble. This is because it can be washed away with water in a later step.

[0018]

As described above, according to the method of forming a latex layer according to the present invention, since the latex solution is sprayed in a shower shape, unlike the case of dipping, there is no time for the latex solution to penetrate into the texture or the like. This has the advantage that a flexible latex layer can be formed on the surface of the object. Further, if the object is continuously conveyed to the latex solution shower and sprayed, a latex layer can be continuously formed on a plurality of surfaces of the object.

[Brief description of the drawings]

FIG. 1 is an explanatory view illustrating a manufacturing method of the present invention.

FIG. 2 is a diagram showing a structure of a three-dimensional woven fabric.

FIG. 3 is a cross-sectional view of an example of a product on which a latex layer is formed.

FIG. 4 is an explanatory view of a conventional method for forming a latex layer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Latex coagulant solution 2 Substrate 3 Latex solution 4 Latex layer 51 Upper cloth 52 Lower cloth 53 Connecting thread

Claims (1)

[Claims] 1. A method for forming a latex layer, comprising a step of spraying a latex solution onto a substrate having a latex coagulant adhered to a surface thereof.