JPH02270533A - Manufacture of rolled polymeric material sheet - Google Patents

Abstract

PURPOSE:To roll a polymer material at a high yield with inexpensive facilities by a method wherein the first pass in rolling is performed under without tension and rolling under tension is performed after intermediate pass or at the final pass. CONSTITUTION:In the manufacture of rolled polymer material sheet by multi- pass and reverse rolling, the first pass in rolling is performed under no tension and rolling under tension is performed after intermediate pass or at the final pass. By utilizing the application of tension as necessary minimum as possible, the rolling at a high yield can be possible even by the process such as a tension reel system, the cost of equipment of which is low. Though the application of tension in normal rolling makes stable rolling or rolling, the product by which has favorable flat shape with no warpage, possible, said rolling state most strongly relate to the sheet thickness. When the sheet thickness is comparatively large, the rolling can be performed without trouble even under no application of tension in the comparatively favorable shape. By applying tension with tension reel as a tension application device under the condition that the sheet thickness becomes small, the fully satisfactory shape of sheet is finally obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION This invention relates to a method for manufacturing plate-shaped products by rolling polymeric materials.

Conventional technology Polymer materials can be stretched by rolling.
It is known to have high strength and excellent impact resistance. In order to obtain such a plate material, for example, as disclosed in Japanese Patent Application No. 81-123435,
As shown in FIG. 1, there is a method in which tension reels 2 are provided before and after a rolling mill 1 to perform rolling while applying tension.

Furthermore, as shown in FIG. 2, Japanese Patent Application No. 82-285408 discloses that pinch roll stands 7 and 8 are provided before and after one main rolling mill 6, and the roll speed is adjusted using these. proposed a method of applying tension or pushing force.

In both cases, when rolling polymers, it is difficult for the material to get caught in the rolls, and the amount of rolling reduction is small. This is because rolling while adding is essential.

However, even with these methods, productivity, yield,
There were still issues to be resolved in terms of equipment costs, etc.

Problems to be Solved by the Invention The rolling method using the above-mentioned tension reel has the following problems in advance:
After making holes at the front and rear ends of the material and heating the material,
The material is positioned directly under the opened roll, and after fixing it to the dummy coil of the tension reel using the holes with bolts 13, etc., as shown in detail in Figure 3, the roll is rolled down and rolling is started. A method of starting is taken.

However, in this method, it is necessary to prevent this fastening part from coming into contact with the rolls, so the unrolled portion of the material to be joined to the tension and reel is up to 300 m
■It reaches up to l. After rolling, this part will be cut off, and therefore the proportion of the part that can be used as a product will be reduced.
The so-called yield is extremely low, resulting in increased manufacturing costs.

On the other hand, with the pinch roll method, there are no cut-off parts in principle, and the yield is satisfactory, but when the material length is short, there are parts where no tension is applied due to the stand spacing, resulting in stable stability. In some cases, it may not be possible to perform rolling. Moreover, above all, having two pinch roll stands is not a desirable process in terms of equipment costs.

The inventors have considered one or more points to provide a rolling method with low equipment cost and high yield.

Detailed description of the invention The present invention is.

(1) In a method for producing a rolled plate by stretching a polymeric material by multiple-pass reverse rolling, the initial rolling pass is performed without tension, and the subsequent passes or the final pass are rolled with tension applied. A method for producing a rolled sheet of polymeric material.

(2) In (1), in the initial pass in which no tension is applied, a part of the material in the longitudinal direction is first sandwiched between rolling mill rolls, and rolling is started from the rolled-down state.

(3) In (2), a rolling method in which the leading and trailing ends of the material are always left unrolled while the passes are repeated, and the rolling ends.

It is.

The present invention will be explained in detail below.

The inventors experimentally confirmed the action and effect of tension in the rolling of polymers, and by using tension to the bare minimum, they were able to achieve a single yield even when using a tension reel process with low equipment costs. This made it possible to perform high rolling.

In other words, applying tension during normal rolling
Stable rolling, that is, flat rolling with no warping and good shape, is possible, but this condition is most strongly related to the plate thickness, and when the plate thickness is relatively large, the shape can be maintained even without applying tension. is good and there is no problem in rolling.

However, the smaller the plate thickness, the more the shape becomes defective, and tension is essential to prevent this. In addition, even if a slight warp or other shape defect occurs, if tension is applied using a tension reel as a tension adding device when the thickness of the plate is reduced, the final shape will be satisfactory. We have found through many experiments that this can be obtained.

In other words, there is no need to fix the rear end from the beginning of rolling when the plate thickness is large, which greatly affects the yield. For example, if the trailing end is fixed at or near the final pass, that part can be tightened with a tension device and rolled. Even if it is cut off, the yield per unit increases dramatically because the plate thickness is reduced.

Since the bolt holes are fastened during rolling, it is actually difficult to process bolt holes, etc.; however, for example, a method of fastening using frictional force, as proposed in Japanese Patent Application No. 82-285413, can be fully utilized.

On the other hand, as mentioned above, tension or pushing force cannot be used in the initial pass.

This reduces the biting ability and makes stable biting impossible. In order to solve this problem, as shown in FIG. 4, it is necessary to start rolling from a state in which an intermediate portion of the material in the long direction is rolled down with a roll in advance.

In addition, once the material is released from the roll, it takes time for it to be caught again and efficiency decreases, so when rolling with efficiency as the main focus, it is necessary to In some cases, only the middle part is rolled without being rolled.

These are the differences in biting properties depending on the type of material, plate thickness,
Alternatively, it is selected based on the priority of yield and efficiency.

In addition, even if the material and the roll are stopped during rolling in the middle of rolling, the temperature of the material is heated and kept close to the constant rolling temperature, so the temperature of the material may change enough to cause a problem. There isn't.

Example Plate thickness = 10cm, board width: 1000s layer, length 21mm polyethylene material was rolled up to 3 layers by 3-pass reverse rolling while applying tension from the beginning with a roll diameter = 300cm roll. When rolling, the yield was 40% when the leading and trailing edges (300×2) of the sheet were cut off.

On the other hand, after 3 passes of rolling without tension, the shape became slightly defective, so at this point, the leading and trailing ends were fastened together by friction, and after rolling again while applying tension, the same < (30
0x2) layer m was cut off, but the yield was improved to about 80% since the thickness at that time was 31 mm.

Satisfactory results were obtained regarding the shape.

Effect of the invention According to the present invention, polymer materials can be produced using inexpensive equipment.

It becomes possible to roll with a good yield, thereby producing effects such as making it possible to produce excellent polymer materials.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of the tension reel method as an example of the conventional manufacturing process for rolled polymer sheets, Figure 2 is another example of the pinch roll method, and Figure 3 is an illustration of the fastening section with the tension reel. Schematic diagram, Figures 4 (1) to (0) are explanatory diagrams of an example of the present invention in the usual method of rolling the material while releasing it from the roll in the first pass, Figures 5 (1) to (0 are Detailed description of the invention when rolling the material without releasing it from the rolls 1
It is 1. In Figure 4.5, (1) is the rolling start state, (2) is
(3) indicates a state in which one half has been rolled, (3) indicates a state in which the remaining half has been rolled by reverse rotation, and (0 indicates a state in which the tension device is tightened for the final pass rolling after completing one pass rolling. 1...Roll, 2...Tension reel. 3...Material, 4.Fist/dummy coil, 5...Bolt, 6.Φ・Main rolling machine, 7.811...Pinch roll, 9
...Material, 1011...Roll, 11Φ...Material, 1
2...Dummy coil, 13...Volt, 14.17
...roll, 15.1811 fist/material. 16.19...Tensioning device.

Claims (3)

[Claims] (1) A method for producing a rolled plate by stretching a polymeric material through multiple passes of reverse rolling, characterized in that the initial rolling pass is performed without tension, and subsequent passes or the final pass are rolled while applying tension. A method for producing a rolled sheet of polymeric material. (2) In the initial pass in which no tension is applied, the rolled sheet of polymeric material according to claim (1), wherein an intermediate portion in the longitudinal direction of the material is first sandwiched between rolling mill rolls, and rolling is started from the rolled state. manufacturing method. (3) The method for producing a rolled sheet of polymeric material according to claim (2), wherein the leading and trailing ends of the material are always left unrolled while the passes are repeated, and rolling is terminated.