JPS6014208B2 - 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 TPVAt) sponge roll used for removing and adding moisture and solvents.

Conventionally, this type of sponge roll was made in Jiseki 49-15.
No. 171, it is generally referred to as a sponge roll with a PVC core, and is widely used for removing washing water from agricultural products, livestock products, and various industrial products, or for adding treatment liquid.

The sponge roll according to the above invention involves wrapping a hard plastic tube with non-woven fabric, etc., using this as a molding core, integrally molding a plastic sponge tube around the hard plastic tube, and attaching this to the shaft with bolts or the like. It is attached so that it can be inserted and removed freely.

However, when the plastic sponge is a PVAt sponge, the plastic pipe and the PVAt sponge are integrally constructed, but at that time, the PVA discards water through a formalization reaction, so the interface of the plastic pipe is ruptured by water. There will be.

Furthermore, even if the nonwoven fabric is physically wrapped, the phenomenon of formalization remains the same; in either case, P
The adhesion between VAt sponge and plastic pipe is very weak, and when working with heavy loads, PVAt
The disadvantage was that the sponge and plastic tube peeled off, making it unusable. Furthermore, as an improvement, some adhesives are used when wrapping a non-woven fabric etc. around the plastic pipe, but if the processing liquid is an organic solvent such as thinner or alcohol, the adhesive may be rubber-based or vinegar-based. Since it is vinyl-based, it was attacked by the processing solution, resulting in reduced adhesive strength and peeling of the plastic tube, making it unusable.

As a result of various studies in view of the current situation, the present inventor has completed a method for manufacturing an excellent PVAt sponge roll that has excellent durability and does not peel off by bonding the shaft or pushing and the nonwoven fabric using a reaction-curing adhesive. It is something. The present invention relates to a PVAt sponge roll in which a nonwoven fabric is wrapped around a shaft or bushing, the nonwoven fabric is used as a molding core, and a PVAt sponge cylinder is integrally molded around the shaft or bushing. This is a method for producing a PVAt sponge roll, characterized in that the two are bonded together using a reaction-curing adhesive.

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

First, a non-vertical fabric 2 is adhered to a shaft or bushing 1 with an adhesive 3 to form a core.

The shaft or bushing used in the present invention is made of metal,
It can be made of plastic. Also, metals that are weak against acids are treated to make them acid-resistant. The shaft or bushing can be pretreated to improve adhesion. The nonwoven fabric used in the present invention uses polyester, nylon, vinylon, etc. as the fiber material, and may be used alone or as a blend.The thread thickness used is 2 to 50 deniers. Thickness is 3~low
/ It is desirable that the basis weight should be 22 to 50 for a 3 kite/table. If it becomes thicker, the basis weight can be increased proportionately.

The conditions for this nonwoven fabric are limited based on the impregnability of the PVAt sponge stock solution and adhesive, and the strength and physical properties of the nonwoven fabric.The shape of the nonwoven fabric may be rectangular or spiral, but the shape of the nonwoven fabric may be rectangular or spiral. It is preferable to wrap it around.

The nonwoven fabric is impregnated with adhesive up to 1/2 of the thickness of the nonwoven fabric,
Ensure strong adhesion to the shaft or bushing. As the adhesive, an epoxy-based, urethane-based, rubber-based, phenol-based, or resorcinol-based reactive curing adhesive is used. This is because it cures in a relatively short time and has excellent peel strength, tensile strength, solvent resistance, and acid resistance. Next, the core is placed in the center of the PVAt sponge cylinder manufacturing mold, and the PVA is placed inside the PVAt sponge cylinder manufacturing mold.
A PV mountain sponge roll is integrally manufactured by pouring the sponge stock solution into the roll, completing the reaction in the usual manner, and washing with water.

4 is a layer in which a nonwoven fabric is impregnated with a PVAt sponge.

In this way, the reaction of the PVAt sponge is completed while it is immersed in the nonwoven fabric layer, and the nonwoven fabric is firmly adhered to the shaft or bushing with a hardening adhesive.
The PVAt sponge is firmly attached to the shaft or bushing with the nonwoven fabric in the middle. In the present invention, since the PVAt sponge and the shaft or bushing are integrally manufactured, a long sponge roll can be easily manufactured.

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.

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

In the present invention, the PVAt sponge is impregnated into a non-woven fabric, and the non-woven fabric is impregnated with a curable adhesive, and is firmly adhered to the shaft or pushing. Also, the PVAt sponge cylinder will not peel off.

Furthermore, even when organic solvents are used, since a reaction-curing adhesive is used, it has excellent solvent resistance, and since the adhesive strength does not decrease, it is possible to obtain an excellent PVAt sponge roll that is durable against peeling.

[Brief explanation of the drawing]

FIG. 1 is a side longitudinal sectional view of the product of the present invention. FIG. 2 is a partially enlarged side longitudinal sectional view of the product of the present invention. FIG. 3 is a cross-sectional view of the product of the present invention. 1...Shaft or bushing, 2...Nonwoven fabric, 3...Adhesive, 4...PVAt sponge nonwoven fabric layer, 5...
...PVAt sponge. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. Wrap the shaft or bushing with non-woven fabric, etc.
Using this as a molding core, a polyvinyl acetal sponge cylinder is integrally molded around the shaft or bushing, and the shaft or bushing is bonded to the nonwoven fabric using a reaction-curing adhesive. A method for producing a polyvinyl acetal sponge roll.