JPS5854019B2 - Method for manufacturing polyvinyl acetal sponge roll - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a polyvinyl acetal (hereinafter abbreviated as PVAt) sponge roll used for removing and adding moisture and solvents.

Conventional sponge rolls consist of separately molded PVAt sponge parts that are inserted into shafts or bushings and fixed using rubber-based or vinyl acetate-based adhesives.
The VAt sponge tube is better than the shaft or bushing.
It is manufactured in a smaller size, and the adhesive is applied to the inner diameter part and inserted into the shaft or bushing, but PV
Because the At sponge tube is flexible and has a large elongation, it is extremely difficult to insert, and if this insertion is done without special skills and skill, the inserted PV
This caused the At sponge to become denser and/or twisted in the axial direction, resulting in wavy unevenness on the surface of the sponge strip, which significantly degraded the effectiveness of removing and adding water and solvents. .

As a result of various researches in view of the current situation, the inventor of the present invention discovered that PVA
By attaching a non-woven fabric to the inner diameter between the T-sponges, the shaft or bushing can be easily inserted into the PVAt sponge, and the entire surface can be bonded.
Furthermore, a method has been completed for manufacturing a uniform PVAt sponge roll without causing axial spacing or twisting in the PVAt sponge, and thus without wavy irregularities on the sponge roll surface.

In the present invention, a core wrapped with non-woven fabric is installed in the center of a mold for manufacturing a PVAt sponge tube, and the VCPVAt sponge stock solution is poured into the mold for manufacturing a PVAt sponge tube and formalized. By removing the cylinder manufacturing mold and core, and then washing with water, PVAt
A PVAt sponge with a nonwoven fabric attached to the inner diameter of the sponge cylinder is obtained, then a moisture-curing adhesive is applied to the nonwoven fabric part of the undried PVAt sponge piece, and a shaft or bushing is inserted into this. This is a method for producing a PVAt sponge roll, which is characterized by curing.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

1 in FIG. 1 is a PVAt sponge.

2 is a nonwoven fabric.

The nonwoven fabric used in the present invention may be made of polyester, nylon, rayon, vinylon, or the like as a fiber material, and may be a monowoven fabric or a blended fabric.

Further, the thickness of the thread used is 2 to 50 deniers.

The thickness of the nonwoven fabric is 3 to 10%, and the thickness is 3% as the basis weight.
So 50-150f/rr? Preferably.

If the thickness increases, the basis weight should be proportional to it.

The conditions for this nonwoven fabric were limited based on the impregnability of the PVAt stock solution and the strength.

The above nonwoven fabric is wound around a core for manufacturing a PVAt sponge cylinder.

The shape of the nonwoven fabric may be rectangular or spiral, but it is preferable to wrap it around the entire core.

A thread string may also be used. Next, the core wrapped with the nonwoven fabric was placed in the center of the mold for making PVAt sponge, and the PVAt
Pour the PVAt sponge stock solution into the At sponge cylinder manufacturing mold, impregnate the nonwoven fabric part with the PVAt stock solution, complete the formalization reaction using the conventional method, remove the PVAt sponge cylinder manufacturing mold and core, wash with water, and prepare the PVAt sponge. To obtain a PVAt sponge tube in which a nonwoven fabric is integrally attached to the inner diameter portion of the tube.

Next, a moisture-curing adhesive 5 is applied to the fabric portion of the inner diameter of this undried PVAt sponge, and after inserting the shaft or bushing 4, the adhesive is cured to form the inner diameter cloth part as shown in Figure 2. A PVAt sponge roll of the present invention is obtained.

As the adhesive used in the present invention, a moisture-curing urethane resin or a wet surface underwater-curing epoxy resin is used.

This is because the moisture content of the undried PVAt sponge allows for rapid and strong adhesion at room temperature.

In addition, since the adhesive of the present invention is used for PVAt sponges that have been washed with water after formalization reaction, various adhesives that meet the above conditions can be used without considering acid resistance.

Although the adhesive of the present invention is applied to the nonwoven fabric part, even stronger adhesiveness can be obtained when applied to the shaft or bushing.

When the PVAt sponge roll according to the present invention is used as a shaft, it may be directly attached, and when it is used as a bushing, it may be fixed to the shaft by an appropriate method and then attached to the machine.

The shaft or bushing may be made of metal or plastic, and the shaft or bushing may be pretreated to improve adhesion.

Since the present invention has the above configuration, it has the following effects.

When adhering to a conventional sponge shaft, the elasticity of the sponge is so high that it feels like it sticks to the shaft and is extremely difficult to insert.However, in the present invention, the PVAt sponge is attached to the fabric part of the inner diameter part of the shaft. By inserting something coated with adhesive into the shaft or bushing, it is possible to insert it smoothly into the shaft or bushing without any problems due to the synergistic effect of the low tensile elongation of the nonwoven fabric and the lubricating effect of the adhesive. It was.

In addition, the present invention is characterized in that the PVAt sponge is formalized after being impregnated into a non-woven fabric layer, and the non-woven fabric uniformly retains the adhesive, forms an adhesive layer, and is firmly adhered to the shaft or bushing, so it can be used under high loads. It does not peel off even during work.

In addition, since the load directly applied to the PVAt sponge tube during insertion is very small, twisting of the PVAt sponge and unevenness of the surface of the PVAt sponge do not occur, and it has a uniform outer circumferential surface similar to that of a one-piece molded sponge. As a result, a PVAt sponge roll with excellent effects such as removal and addition of moisture and solvent can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the PVAt sponge. FIG. 2 is a cross-sectional view of the PVAt sponge roll of the present invention. 1...PVAt sponge, 2...Nonwoven fabric, 3...
Shaft or bushing, 4...Adhesive.

Claims (1)

[Claims] 1. A core wrapped with non-woven fabric is installed in the center of a polyvinyl acetal sponge tube manufacturing mold, and the polyvinyl acetal sponge stock solution is poured into the polyvinyl acetal sponge cylinder manufacturing mold to formalize, and then the polyvinyl acetal sponge is formed. The tube manufacturing mold and core are removed and then washed with water to obtain a polyvinyl acetal sponge tube with a nonwoven fabric attached to the inner diameter of the polyvinyl acetal sponge tube. A method for producing a polyvinyl acetal sponge roll, which comprises applying a hardening adhesive, inserting a shaft or bushing therein, and then hardening the adhesive.