JPS587552Y2 - Laminated insulation paper manufacturing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an apparatus for manufacturing laminated insulating paper.

Recently, the use of laminated insulating paper, which is made by laminating cellulose paper on both sides of a plastic film such as polypropylene in a sandwich-like manner, has been considered as an insulating material for ultra-high voltage cables.

Such laminated insulating paper is made by attaching cellulose paper to both sides of a softened plastic film extruded from a T-die of an extruder, and fusing them together by applying pressure with a pressure roll heated to around 100°C. It is manufactured by

However, because the conventional pressure rolls used in such manufacturing methods are composed of a combination of metal rolls and rubber rolls, the cellulose paper on the side that is in contact with the metal rolls has a slipperiness as if it had been ironed. Therefore, when it is wound onto a conductor, it slips and the gap is disturbed.

Therefore, in order to solve this problem, it was considered to apply a rubber mold to the metal roll, but when the metal roll was coated with rubber, stretching force was applied when pressurized, causing wrinkles in the resulting insulating paper. There was a problem with that.

The present invention has been made to solve these conventional difficulties, and includes an extruder that continuously extrudes a plastic film, and a cellulose paper that supplies cellulose paper along both sides of the extruded plastic film. The plastic film and the cellulose paper stretched along the plastic film are screwed together under pressure using a paper supply device.

A laminated paper manufacturing apparatus comprising a pressure roll constituted by a combination of a roll having an elastic surface and a roll having a rigid surface, characterized in that a rough surface is formed on the surface of the roll having the rigid surface. It is an object of the present invention to provide an apparatus for producing laminated insulating paper having rough surfaces on both sides.

Hereinafter, one embodiment shown in the drawings will be explained in detail.

In FIG. 1, 1 is an extruder having a T-die 2;
3' is a cellulose paper supply device, 4 is a rubber roll 5
, a pressure roll 7 consisting of a metal roll 6 heated to around 100°C, 7 made of glass cloth, cotton cloth, linen cloth, felt, etc., passed over the metal roll 6, which is subjected to mold release treatment with silicone oil. It is an endless cloth belt decorated with.

The film 8 made of a plastic with good oil resistance, such as silicone-grafted high-density polyethylene containing polypropylene and a silanol condensation melt, is extruded from the T-die 2 of the extruder 1. Cellulose paper 9, 9', such as condenser paper or kraft paper, supplied from the supply devices 3, 3' is added and sent to the pressure roll 4, where it is pressurized and fused.

At this time, since the surface of the pressure roll 4 is covered with the endless cloth belt 7 that is fed out at the same speed as the cellulose paper 9, the surface of the cellulose paper 9 is covered with the cloth belt l.
-7 textures form a rough surface.

According to the device of the present invention configured as described above, the coefficient of kinetic friction on the side of the laminated insulating paper that is in contact with the metal roll obtained when using a conventional combination roll of a rubber roll and a metal roll is equal to that on the other side. The value was about 10% smaller than that of the previous paper, but now it is almost the same value. Therefore, when it is wound onto a conductor, it is possible to obtain a laminated insulating paper that does not cause gap disturbance due to slippage.

In addition, in the above embodiment, an example was explained in which an endless cloth belt was placed along the rigid roll surface as a means to roughen the surface, but the present invention should not be limited to such an embodiment. .

In other words, instead of running a cloth belt along a metal roll, the surface of the metal roll is coated with a paint containing inorganic powder and baked, or the metal roll itself is coated with a ceramic or porcelain material with a roughened surface. It may be replaced with a roll.

[Brief explanation of the drawing]

The drawings are explanatory diagrams showing one embodiment of the present invention. 1... Extruder, 3,3'... Cellulose paper feeding device, 4... Pressure roll, 7...
...cloth belt.

Claims (1)

[Scope of utility model registration request] 1. an extruder that continuously extrudes a plastic film; a cellulose paper supply device that supplies cellulose paper along both sides of the extruded plastic film; In a laminated paper production device comprising a pressure roll configured by a combination of a roll with an elastic surface and a roll with a rigid surface, which fuses cellulose paper under pressure, the surface of the roll with the rigid surface is A manufacturing device for laminated insulating paper characterized by forming a rough surface. 2. The apparatus for producing laminated insulating paper according to claim 1, which is a utility model, wherein the rough surface of a roll having a rigid surface is formed by forming an endless cloth belt along the surface of the roll. 3. The apparatus for manufacturing laminated insulating paper according to claim 1, wherein the rough surface of a roll having a rigid surface is formed by baking an inorganic powder coating onto the surface of the roll. 4. The apparatus for producing laminated insulating paper according to claim 1, wherein the roll having a rigid surface is made of porcelain or earthenware having a rough surface.