JPS6014206B2 - 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 PV mountain) sponge roll used for removing and adding moisture and solvents.

Conventional sponge rolls are made by inserting a separately molded PVAt sponge tube into a shaft or bushing.
It is fixed using a vinyl acetate adhesive, and the PVAt sponge cylinder is usually manufactured to be slightly smaller than the shaft or bushing, and the adhesive is applied to the inner diameter of the tube and then inserted into the shaft or bushing. ,
Because the PVAt sponge tube is a flexible porous material, it makes full contact with the shaft or bushing, making it difficult to slip evenly and making it extremely difficult to insert. PV
This will cause the N sponge to become loose or twisted in the direction of the ball.
As a result, the surface of the sponge cylinder has wavy irregularities, and the effectiveness of removing and applying the solvent is significantly deteriorated.

In view of the above-mentioned current situation, the present inventor has made various researches and found that by interposing a woven or non-woven fabric, the shaft or bushing can be inserted into the PVAt sponge tube very easily.
We have completed a method for manufacturing a uniform PVAt sponge roll that can bond the sponge cylinder and bushing or bushings on the entire surface without causing axial spacing or twisting of the PVAt sponge, and therefore has no wavy irregularities on the sponge roll surface. It is something.

The present invention provides an inner wall portion of an undried PVAt sponge cylinder, and a PV At sponge tube.
Coarse woven or non-woven fabric covering the entire inner diameter of the At sponge cylinder and moisture curing or wet surface underwater curing adhesive are applied to the outer circumferential surface of the shaft or bushing, and the PVAt sponge cylinder is attached to the shaft or bushing. This method of manufacturing a PVAt sponge roll is characterized in that after simultaneously inserting a woven fabric or a non-woven fabric, the adhesive is cured.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings. 1 in Figure 1 is undried PVA manufactured by a conventional method.
It is a sponge tube.

The reason why the undried PVAt sponge is used is that the adhesive is cured by the moisture in the sponge, and the undried PVA
This is because while a T-sponge tube is easily deformed, a dry PVAt sponge tube is hard and difficult to insert and adhere to a shaft or bushing. 2 is a woven fabric or a nonwoven fabric.

Use it to cover the entire inner diameter of the PVAt sponge tube.

The woven fabric used in the present invention is gauze or the like, and both non-woven fabric and coarse woven fabric can be used. In either case, the adhesive can be retained,
Any material may be used as long as it is slippery and can withstand the tensile strength when inserting the shaft or bushing. The fiber material for the woven or nonwoven fabric is preferably cotton, rayon, or vinylon from the viewpoint of adhesive properties. 3 in FIG. 2 is a shaft or a bushing.

In the present invention, an adhesive is applied to the inner ridge of an undried PVAt sponge tube, the woven fabric or nonwoven fabric, and the outer peripheral surface of the shaft or bushing, and the PV At sponge tube is attached to the shaft or bushing.
After inserting the At sponge tube and the woven fabric at the same time, the adhesive is cured.

Since the adhesive used in the present invention has excellent strength and curing properties, it is desirable to use a moisture-curing urethane resin or a wet surface underwater-curing epoxy resin. In this case, the curing property means that the moisture in the undried PVAt sponge tube causes the adhesive to form a distant bond at room temperature.

When woven or non-woven fabric can hold a large amount of adhesive,
Applying adhesive to the shaft or bushing can be omitted. 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 any conventional method and then attached to the machine. The shaft or pusher may be made of metal or plastic.
The shaft or bushing can also be pretreated to improve adhesion. In the present invention, the shaft or bushing can be easily inserted into the PV mountain sponge tube by inserting the PVAt sponge tube and the woven fabric or non-woven fabric into the shaft or bushing at the same time, instead of inserting the shaft or pushing directly into the sponge tube. Therefore, the shaft or bushing is inserted into the PVAt sponge cylinder while contacting the woven or non-woven fabric.

This woven fabric or non-woven fabric is made of fibers compared to the inner diameter of the sponge cylinder, so the contact area with the shaft or bushing is small and the resistance is extremely low, and the applied adhesive liquid plays the role of a lubricant. The synergistic effect of this makes it extremely slippery, making it easier to insert the shaft or bushing. Therefore, first attach a woven or non-woven fabric to the shaft or bushing, and then attach the PV
When inserting a shaft or a bushing into an At sponge tube, a large load is applied to the PVAt sponge tube during insertion, deforming it and causing the same drawbacks as in the conventional example.

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

The present invention achieves this by simultaneously inserting a PVAt sponge tube and a woven or non-woven fabric into the shaft or bushing.
The shaft or bushing becomes extremely slippery due to the synergistic effect of the woven or non-woven fabric and the adhesive and can be easily inserted.

In addition, since a woven or non-woven fabric is used between the PVAt sponge tube and the shaft or bushing, the adhesive can stay uniformly and form an adhesive layer, resulting in strong adhesion and no peeling even during high-load work. This results in an excellent sponge roll with excellent durability. Furthermore, in the present invention, when inserting the shaft or bushing into the inner flap part of the PVAt sponge cylinder, the load applied directly to the inner flap part of the PVAt sponge due to the woven or non-woven fabric is extremely reduced. There is no unevenness or distortion on the surface, and the product has a uniform outer circumferential surface similar to that of one-piece molding. removal of moisture and solvents,
A broken PV mountain sponge roll with effects such as endowment is obtained.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a PVAt sponge tube. FIG. 2 is a sectional view of a PVAt sponge roll of the present invention. 1...PV mountain sponge, 2...Woven fabric or non-woven fabric, 3...Shaft. Uh, Shisun 2 Sakaki

Claims (1)

[Claims] 1. Moisture curing type or wet surface underwater curing type is applied to the inner diameter of the undried polyvinyl acetal sponge cylinder, the coarse woven fabric or nonwoven fabric covering the entire inner diameter of the polyvinyl acetal sponge cylinder, and the outer peripheral surface of the shaft or bushing. A method for producing a polyvinyl acetal sponge roll, which comprises applying an adhesive, simultaneously inserting a polyvinyl acetal sponge tube and a woven fabric or non-woven fabric into a shaft or bushing, and then curing the adhesive.