JPH029957Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a roll having a silicone rubber layer on its surface.

(Description of Prior Art) Rolls having a silicone rubber layer on the surface of a foam are expected to be used in many fields because of their excellent heat resistance. And conventional products of this kind are
The silicone rubber layer and the foam were bonded together with an adhesive. However, since silicone rubber generally has poor adhesion, when adhering to foam, the adhesion surface must be treated with a primer to improve adhesion. Depending on the type of adhesive, the adhesive strength may be insufficient and the silicone rubber layer may peel off, so improvements have been sought. Particularly in the case of rolls, the silicone rubber layer on the surface was likely to separate from the foam inside due to surface friction during roll rotation.

(Purpose of the invention) The object of the invention is to provide a roll in which the silicone rubber layer and the foam are firmly bonded in a foam molded article having a silicone rubber layer on the surface.

(Structure of the invention) The gist of the invention is that a roll having a silicone rubber layer on the surface is formed into an outermost layer consisting only of silicone rubber, and a silicone rubber continuously existing from this outermost layer impregnated into a foam. It has a three-layer structure consisting of an intermediate layer made of foam, and a central layer made only of foam that continues from the intermediate layer.

The present invention will be described in more detail below using drawings showing an embodiment of the present invention.

FIG. 1 is a partially cutaway perspective view of a roll used in a copying machine or computer, which is an embodiment of the present invention, and FIG. 2 is an enlarged view of section A.

This roll consists of an outermost layer 1 consisting only of silicone rubber, an intermediate layer 2 in which silicone rubber is impregnated into a foam that is continuous from the outermost layer 1, and a foam that is continuous from this intermediate layer. It consists of a center layer 3, and a shaft 4 for attaching this roll to the main body of a copying machine or the like. The foam forming the intermediate layer 2 and the center layer 3 is composed of one molded body, and is mainly composed of an open-cell structure that can be impregnated with liquid silicone rubber when the outermost layer 1 is formed from liquid silicone rubber. , mainly polyurethane foam is used.

Next, manufacturing of this roll will be explained. This roll carries an intermediate molded product, which is made by passing a shaft through the center of a foam of a predetermined shape, mainly having an open-cell structure such as polyurethane foam, into the cavity of a mold having a cavity that is a predetermined dimension larger than the outer diameter of the foam. The space between the surface of the foam and the inner surface of the cavity is filled with liquid silicone rubber, and then the mold is heated to a predetermined temperature for a predetermined period of time, usually several tens of seconds to several minutes, to harden the liquid silicone rubber. A silicone rubber layer of a predetermined thickness is formed on the surface of the foam, and the mold is removed after cooling. Then, the obtained roll has an intermediate layer (2 in the figure) in which liquid silicone rubber is impregnated into the foam and hardened near the surface of the foam in contact with the silicone rubber layer forming the outermost layer (1 in the figure). Therefore, the inner foam forming the center layer (3 in the figure) and the silicone rubber layer forming the outermost layer are strongly bonded.

In addition, the amount of liquid silicone rubber filled into the cavity, heating temperature, heating time, degree of open celling of the foam, etc. are optimal from the viewpoints of the product type, the hardness of the outermost layer made of silicone rubber, the production cycle, etc. The conditions are selected.

(Effects of the invention) As described above, the present invention consists of a roll having a silicone rubber layer on the surface, an outermost layer consisting only of silicone rubber, and a foam impregnated with silicone rubber continuously present from this outermost layer. The middle class that will become
It is formed of a three-layer structure including a central layer consisting only of a foam material continuously existing from this intermediate layer. Therefore, the silicone rubber layer forming the outermost layer and the foam forming the center layer are strongly bonded by the intermediate layer formed by impregnating the silicone rubber into the foam, and the long-term life of the roll. There is no risk that the outermost layer consisting only of silicone rubber will separate from the middle layer and the center layer even by rotation. or,
The product of this invention does not require primer treatment during manufacturing, and has also realized rationalization of manufacturing.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view of a roll that is an embodiment of the present invention, and FIG. 2 is an enlarged view of section A in FIG. 1. 1...outermost layer, 2...middle layer, 3...center layer.

Claims (1)

[Scope of utility model registration request] An outermost layer consisting only of silicone rubber, an intermediate layer formed by impregnating a foam with silicone rubber that exists continuously from this outermost layer, and a central layer that consists only of foam that exists continuously from this intermediate layer. A roll having a silicone rubber layer on the surface, characterized by having a three-layer structure.