JPS608970Y2 - Rubber/plastic coated roll forming equipment - Google Patents

Description

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

2. Description of the Related Art Conventionally, there is a roll molding apparatus as shown in FIG. 1, in which the outer periphery of a mandrel is coated with room temperature curing rubber such as room temperature curing silicone rubber or plastic.

That is, in FIG. 1, a cap 2 is fitted to the bottom of a cylindrical case 1, and inside the case 1 are a large diameter part 3a having an outer diameter smaller than the inner diameter of the case 1 and a small diameter part 3b provided at both ends thereof. It is formed by coaxially disposing a mandrel 3 having a.

Thus, the mandrel 3 is temporarily fixed in the case 1 by removably fitting its small diameter portion 3b into a blind hole 2a provided in advance in the cap 2.

Further, a presser cap 4 for pressing the mandrel 3 is provided on the upper part of the case 1 as required.

In a device having such a structure, after the cap 2 is fitted to the bottom of the case, a predetermined amount of cold-curing coating material (liquid) 5 is poured into the case 1, and then the mandrel 3 is placed on the cap 2. It is made to stand up so that the covering material 5 covers the outer periphery of the large diameter portion of the mandrel 3.

By leaving it in this state for a while, the coating material 5 is cured at room temperature, and after curing, the mandrel 3 is pulled out from the case 1 to obtain a rubber or plastic coated roll.

However, in the conventional device described above, the work of inserting the small diameter portion 3b into the blind hole 2a of the cap 2 in order to make the mandrel 3 stand up on the cap 2 is performed with the coating material placed in the case 1, which is time-consuming. Not only does it cost, but also the small part 3
In order to confirm the position of the blind hole 2a, the tip b stirs the coating material in the vicinity, which has the disadvantage that air is likely to be drawn into the coating material.

If this air is mixed in, it will remain in the coating layer as air bubbles, significantly reducing the quality of the roll.

The present invention was devised to eliminate these drawbacks of conventional devices, and provides a molding device that simplifies installation of a mandrel and reduces air entrainment.

That is, in the present invention, as shown in FIG. 2, a cap 7 is inserted into the bottom of a cylindrical case 6 constituting a so-called mold, and a mandrel 8 is supported at the center of the cap 7 and coaxially inserted into the case 6. In the case where the cap 7
, the seal part 7a that contacts the inner wall of the case and the core bearing that supports the mandrel 8 are divided into two parts, and the seal part 7a and the core bearing have a mutual contact surface with the part 7b that has a concave surface 9 and a concave surface 9. There is also a feature that the corresponding text is 10.

The case 6 is made of metal such as iron or aluminum, or cardboard, and a separator 11, which will be described later, is closely attached to the inner circumferential wall of the case 6 if necessary.

The mandrel 8 has a large diameter portion 8a having an outer diameter smaller than the inner diameter of the case 6, and small diameter portions 8b provided at both ends thereof.

The mandrel 8 is arranged coaxially within the case and has a lower small diameter portion 8.
b is the center of the cap 7 through the blind hole 12 provided in the portion 7b.
The upper small diameter portion 8b is fitted into the hole 13a of the presser cap 13 fitted to the upper part of the case 6, thereby fixing the case.

The cap 7 is made of a suitable material such as rubber, plastic, or metal, and the outer periphery of the seal portion 7a and the inner circumferential wall of the case 6 are tightly fitted.

The contact surfaces 9 and 10 between the sealing portion 7a of the cap 7 and the core bearing portion 7b are such that they fit together simply by placing the core bearing portion 7b on the sealing portion 7a, and the mandrel 8 is coaxially attached to the case 6. It is formed in a shape that allows it to be placed.

The molding apparatus having the above configuration is used as follows.

First, with the seal portion 7a of the cap attached to the bottom of the case 6, a predetermined amount of a room temperature curing liquid rubber such as a room temperature curing silicone rubber or a plastic coating material 14 is poured into the case 6.

Thereafter, the mandrel 8 is inserted into the case 6 with the cap core holder part 7a attached to the lower small diameter part 8b, and is made to stand up on the cap seal part 7a.

At this time, the covering material 14 is made to cover the outer periphery of the large diameter portion of the mandrel 8.

After being left in this state for a while and the coating material hardens at room temperature, the mandrel 8 is pulled out from the case and the cap core holder attached to the lower small diameter portion is separated to obtain a rubber or plastic coated roll.

Thereafter, the outer periphery of the coating layer is polished to obtain a roll of desired dimensions.

As described above, the device according to the present invention separates the cap fitted into the bottom of the case into two parts: the seal part and the core part.
By dividing the parts and making the mutual contact surfaces of the circumferential parts a concave concave surface and the corresponding text, when in use, the mandrel stands coaxially within the case, but the cap core holder simply attached to the mandrel does not allow the parts to be capped. It is possible to stand up coaxially just by placing it on the seal part, and the work of attaching the shaft is extremely simple.

A comparison experiment with the conventional example shown in FIG. 1 was conducted, and the molding apparatus of the present invention required approximately 172 working hours and a defect rate of 1110 or less.

Moreover, since the mounting of the mandrel sometimes does not require stirring the liquid coating material that has previously been poured into the case, there is no problem of air being entrained in the coating material due to stirring.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing a conventional device, and FIG. 2 is a vertical sectional view showing an embodiment of the present invention. 1.6...Case, 2,7...Cap, 3゜8...Mandrel, 5,14...Coating material, 7a...・・Seal part, 7b・・・・
・The center support is partial, 9... concave, 10...
Text.

Claims (1)

[Scope of utility model registration request] A cylindrical case with a bottom, a cap that is removably inserted into the bottom of the case to seal the bottom of the case, and a mandrel that is coaxially disposed within the case and is removably supported by the cap, The seal part where the cap contacts the inner wall of the case and the core bearing that supports the mandrel are divided into two parts, and the mutual contact surface of the seal part and the core bearing with the parts is a concave concave surface and a corresponding part. Features rubber and plastic coated roll type equipment.