JPS608962Y2 - Rubber and plastic roll molding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rubber or plastic roll type device.

The first conventional rubber/plastic roll molding device
There are those shown in the figure.

That is, it has a cylindrical case 1 with a bottom and a core 2 disposed coaxially within the case 1, and a liquid cold-curing rubber or plastic material 3 is placed in the gap between the case 1 and the core 2.
For example, room temperature curing silicone rubber is filled and cured.

In this conventional device, rubber, plastic materials 3
When the rubber hardens, a uniform thickness of rubber is formed on the core metal 2.
A roll having a plastic coating is molded, and in consideration of ease of pulling out the molding roll 1 from inside the case, a sheet-like separator 4 is placed in advance so as to be in contact with the inner circumferential wall of the case 1. The forming roll is then pulled out from the case 1 together with the separator 4.

However, in practice, there is a problem in that the friction between the case 1 and the separator 4 is large, and it takes time and effort to pull out the roll, resulting in poor workability.

The present invention was devised to solve these difficulties, and is a device that reduces friction between the separator and the case by providing a plurality of grooves at appropriate intervals on the inner peripheral wall of the case in contact with the separator. It provides:

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIGS. 2 and 3 show an embodiment of the present invention.

In these figures, a cylindrical case 5 with a bottom is formed by inserting a sheet-like separator 7 rolled into a cylindrical shape into a cylindrical body 6 with open ends, and a cap 8 fitted and fixed at the bottom.

A blind hole 9 is provided in the center of the cap 8, and one end of a mandrel 10 is removably inserted into the blind hole 9, so that the mandrel 10 is coaxially arranged inside the case 5.

The cylindrical body 6 of the case 5 may be made of an iron pipe, an aluminum pipe, a vinyl chloride pipe, a paper tube, or the like, and the outer surface may have any shape as long as the inner surface is cylindrical.

Further, a plurality of grooves 11 are provided on the inner circumferential wall of the cylindrical body 6 at appropriate intervals.

The cross-sectional shape of these grooves 11 may be either square or round.

The separator 7 is made of a plastic film such as polyester film or polyethylene film, or a binder sheet such as silicone surface-treated paper.
It has the rigidity to return to its original shape when rolled into a cylindrical shape.

The core 10 is made of metal such as aluminum, stainless steel, or iron, and one end is fixed on the cap 8 inside the case 5.
The other end is pressed by an upper cap 12 fitted into the upper part of the case 5.

In the case of roll-bottom molding using the apparatus configured as described above, a sheet-like separator is arranged so as to be in contact with the inner circumferential wall of the cylindrical body 6, and a sheet-like separator is placed in the case 5 with the cap 8 attached to the bottom of the sheet-like separator. A predetermined amount of liquid rubber or plastic 13 such as rubber is injected, the mandrel 10 is set, and the rubber or plastic is left to harden in this state.

After curing, a roll with rubber or plastic 13 coated on core metal 10 is molded, which is pulled out from case 5 together with separator 7 and polished to become a product.

The separator 7 is stripped off from the roller and then reused.

As mentioned above, the device according to the present invention has a plurality of grooves spaced at appropriate intervals on the inner peripheral wall of the case in contact with the separator, so that the friction between the separator and the case is greatly reduced, and the forming roll is moved together with the separator into the case. The work of pulling out from within can be done quickly and smoothly.

For example, it has been confirmed through experiments that the device of the present invention can reduce the drawing time by about 1n compared to a case with a smooth inner peripheral wall as shown in FIG.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing a conventional device, FIG. 2 is a cross-sectional view showing an embodiment of the device of the present invention, and FIG. 3 is a cross-sectional view taken along line 2--2 in FIG. 5... Case, 7... Separator, 1
0... Core metal, 11... Concave groove, 13...
...Rubber or plastic.

Claims (1)

[Scope of utility model registration request] It has a bottomed cylindrical case in which a sheet-like separator is arranged so as to be in contact with the inner peripheral wall, and a mandrel arranged coaxially within this case. 1. A rubber or plastic roll molding device for filling and curing a plastic material, characterized in that a plurality of grooves are provided at appropriate intervals on the inner circumferential wall of a case in contact with a separator.