JPH0741622B2 - Roller for polymer sheet production - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll device suitable for finishing a sheet made of a polymer material, particularly a thin material sheet made of rubber or synthetic resin, to a smooth or uneven surface.

[0002]

2. Description of the Related Art A technique of finishing a material sheet having a predetermined thickness made of a polymer material by two rolls arranged in parallel to each other is well known.

In this technique, Japanese Patent Publication No. 51-2953
As disclosed in Japanese Patent Laid-Open Publication No. 2004-242242, two rolls are constituted by a metal rigid roll and a rubber elastic roll. Since it is not possible to make a mirror-like smooth surface of a certain degree, there is a problem that when the surface is finished to be smooth, the sheet in contact with the elastic roll is not sufficiently smooth.

As a countermeasure, the inventor and the patent applicant of the present application, as disclosed in Japanese Unexamined Patent Publication No. 62-132619, are metal cylinders having a hard metal plating layer on the outer surface of an elastic roll, that is, It was proposed to cover with a thin hard outer layer. According to this structure, the surface of the elastic roll can be a mirror-like smooth surface to the same extent as the surface of the rigid roll, and it is possible to manufacture a sheet having a smooth surface or a highly transparent surface.

In such a roll device, a material sheet is passed between two rolls to finish it into a sheet having a desired surface condition with a predetermined thickness. The eccentricity between the center of rotation and the center of roll and the trueness of the roll are measured. Variations in the gap size and contact pressure between the two rolls due to circularity, mechanical oscillation during operation, etc. are absorbed by an elastic layer such as rubber of the elastic roll.

However, since the absorbing operation by compression and restoration of the elastic layer is considerably large and slow, it is difficult to completely absorb it, and when the sheet is thick, the uneven thickness which the elastic layer cannot absorb is ignored. Even if it is possible, if the thickness of the sheet is thin, it cannot be ignored in terms of the quality of the product if the thickness unevenness is the same as that of the thick one.

Further, when unevenness is provided on the elastic roll side in order to give an uneven pattern such as embossing to the sheet, the uneven surface is formed by pressing a mold harder than the outer surface of the hard outer layer and transferring the mold. Since it is pressed with a strong force, the hard outer layer may be deformed after compressing the elastic layer to the maximum, and the roundness of the elastic roll is significantly reduced, and a uniform sheet having a predetermined uneven pattern with a predetermined thickness is formed. The problem that it becomes impossible to manufacture easily arises.

[0008]

SUMMARY OF THE INVENTION The problem to be solved by the present invention is to produce a homogeneous thin sheet possessed by the conventional roll device in which a rigid roll and an elastic roll having a hard outer layer are arranged in parallel with each other. In addition to this, it is often difficult to manufacture a sheet having a predetermined uneven pattern in which the unevenness of the hard outer layer is faithfully transferred.

[0009]

In order to solve the above-mentioned first problem, the present invention provides an elastic roll comprising an elastic inner layer, a thin hard outer layer on the outer peripheral surface thereof, and a hard metal plating on the outer peripheral surface thereof. And a hard metal plating layer on the outer peripheral surface thereof.

In order to solve the second problem, the present invention has a structure in which a soft metal plating layer is provided with an uneven surface of an arbitrary pattern and a hard metal plating layer is provided in accordance with the unevenness.

[0011]

[Function] When the material sheet is sandwiched between the rigid roll and the elastic roll and passed, the elastic inner layer absorbs most of the gap size of the two rolls and the variation of the compression pressure, and the variation not absorbed by the elastic inner layer The soft metal plating layer absorbs within its elastic deformation range and eliminates the uneven thickness of the sheet.

Further, the unevenness of the soft metal plating layer is easily formed by the mold and is faithfully transferred to the sheet by the hard metal plating layer.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. A rigid roll 1 has a structure in which a hard metal plating layer 3 such as chrome is provided on the outer surface of a roll main body 2 made of a thick iron cylinder. It has a spindle 4 at both ends.

The elastic roll 5 is made of a metal such as iron or copper by providing a thick cylindrical elastic inner layer 7 made of rubber, synthetic resin or a foam thereof on a rigid core shaft 6 made of iron. A thin cylindrical hard outer layer 8 is tightly fitted to the outer peripheral surface of the elastic inner layer 7, and a soft metal plating layer 9 such as copper or aluminum is provided on the outer peripheral surface of the hard outer layer 8 and further hard such as chrome. The metal plating layer 10 is replaced with the soft metal plating layer 9
Is provided on the outer peripheral surface of the shaft 1, and the support shaft 1 is provided at both ends of the core shaft 6.
Have one.

The hard outer layer 8 generally has a thickness of 1.5 to 0.5.
The thickness of the soft metal plating layer 9 provided on the outer peripheral surface is generally about 50 to 120 μm, but when the uneven surface is provided, the thickness is preferably about 200 to 300 μm. The outermost hard metal plating layer 10 generally has a thickness of about 30 to 50 μm.

Further, the elastic inner layer 7 of the elastic roll 5 is made of a material having elasticity capable of being compressed by its thickness when the sheet is passed between the elastic roll 5 and the roll 1, and when heat resistance is required. It is recommended to use a heat resistant polymer material such as liquid silicone rubber. The hard outer layer 8 is required to have elasticity such that the hard outer layer 8 is integrally deformed with the elastic inner layer 7 by the thickness of the sheet and can be restored after passing through the sheet.

Further, the outer surfaces of the rigid roll 1 and the elastic roll 5 are both finished into a mirror-like smooth surface by the hard metal plating layers 3 and 10, and the sheets are made smooth by passing between them. be able to.
Then, variations in the gap size and contact pressure of the two rolls 1 and 5 that cannot be absorbed by the elastic inner layer 7 are absorbed within the elastic deformation range of the soft metal plating layer 9 to eliminate unevenness in the thickness of the sheet and finish it to a uniform thickness. be able to.

In some cases, either or both of the two rolls 1 and 5 may be embossed or have an uneven surface having an arbitrary pattern, and the sheet may be provided with an uneven pattern.

In this case, in the elastic roll 5, the uneven surface 9A is formed by transferring the mold to the outer surface of the soft metal plating layer 9 with a smaller force and easily without deforming the hard outer layer 8. You can Further, by providing the hard metal plating layer 10 according to the uneven surface 9A, predetermined unevenness appears on the outer surface of the elastic roll 5 as it is, and this unevenness is directly eaten by the sheet due to the hardness of the hard metal plated layer 10 itself. It can be faithfully transferred to give an uneven pattern.

[0020]

As described above, according to the present invention in which the elastic roll having the structure in which the thin hard outer layer, the soft metal plating layer, and the soft metal plating layer are sequentially provided on the elastic inner layer is combined with the rigid roll, By using the elastic deformation of the metal plating layer to absorb the fluctuation between the two rolls that cannot be absorbed by the elastic inner layer,
Particularly, it is possible to finish a sheet having a uniform thickness by eliminating the non-negligible thickness unevenness which occurs in a thin sheet. In addition, the soft metal plating layer also has an effect of mitigating the impact when the hard metal plating layer hits the rigid roll after the sheet has passed and preventing damage.

Furthermore, since the soft metal plating layer is provided with an uneven surface such as embossing, it can be easily formed with a small force without deforming the hard outer layer, and the roundness of the elastic roll is lowered to cause uneven thickness of the sheet. It is possible to form the required unevenness pattern by faithfully transferring the unevenness to the sheet by the hard metal plating layer thereon, without causing the cause of the above.

[Brief description of drawings]

FIG. 1 is a partially enlarged vertical sectional view showing an embodiment of the present invention.

[Explanation of symbols]

1 rigid roll, 5 elastic rolls, 7 elastic inner layer,
8 hard outer layer, 9 soft metal plating layer, 9A uneven surface, 10 hard metal plating layer,

Claims (2)

[Claims] 1. A roll device for producing a sheet made of a polymer material, comprising a rigid roll and an elastic roll arranged in parallel with each other, wherein the elastic roll has an elastic inner layer and a thin wall provided on an outer peripheral surface of the elastic inner layer. Of the hard outer layer, a soft metal plating layer provided on the outer peripheral surface of the hard outer layer, and a hard metal plating layer provided on the outer peripheral surface of the soft metal plating layer. 2. The roll device according to claim 1, wherein the soft metal plating layer has an uneven surface having an arbitrary pattern, and the hard metal plating layer is provided in accordance with the unevenness.