JP4077654B2 - Rubber rolling method and rubber rolling apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rubber rolling method and a rubber rolling device, and in particular, continuously obtains a long rolled rubber sheet having tapered portions on both sides in the width direction that gradually decrease in thickness toward the end in the width direction. The present invention relates to a rubber rolling method and a rubber rolling apparatus.
[0002]
[Prior art]
When rolling a long rolled rubber sheet 108 having a cross-sectional shape as shown in FIG. 6 (D) provided with tapered portions on both sides in the width direction with tapered portions gradually decreasing toward the width direction end portion, There were two methods, a method of making a rubber bank on the roller head and a method of not making it.
[0003]
First, when a rubber bank is formed on the roller head, a rubber bank 104 is formed on the roller head 102 disposed on the rubber discharge side of the rubber extruder 100 as shown in FIG. Since it is only for the purpose of supplying a certain amount of rubber to the roller head 102, a circular shape as shown in FIG. 6 (B) or a rectangular shape as shown in FIG. 6 (C) is common.
[0004]
Next, when the roller head rubber bank is not formed, the opening shape of the base 14 is generally a rectangle that is approximately approximate to the roller head profile.
[0005]
[Problems to be solved by the invention]
However, in the case of a conventional method for forming a bank on a roller head, when the bank amount increases / decreases due to variations in the discharge of the rubber extruder, particularly when the bank amount increases, the roller head protrudes outside the sheet profile (see FIG. There is a problem that the protruding portion 108) and the protruding portion 108 are in close contact with the roller head 102 and sometimes adhere to the rolled rubber sheet and contain foreign matters.
[0006]
On the other hand, as shown in FIG. 8 (A), when a rubber bank is not formed in the roller head 102, a relatively wide extruded rubber 110 having a cross-sectional shape as shown in FIG. Rolled by the head 102.
[0007]
However, during rolling, the central straight portion (constant thickness portion) and the taper portion have different rolling directions (arrow directions: rubber orientation) as shown in FIG. Since the taper portion is less than the straight portion, a phenomenon that the taper portion is wavy occurs with time, and there is a problem of hindering sheet quality.
[0008]
In consideration of the above-mentioned facts, the present invention solves various problems of the prior art, and continuously forms a rolled rubber sheet having good properties with tapered portions on both sides in the width direction that gradually decrease in thickness toward the end in the width direction. It is an object of the present invention to provide a rubber rolling method and a rubber rolling apparatus that can be obtained.
[0009]
[Means for Solving the Problems]
In the first aspect of the invention, the unvulcanized rubber extruded from the die of the extruder is rolled by a roller head composed of a pair of rotating rollers, and the thickness gradually decreases toward the end in the width direction. A rubber rolling method for continuously obtaining a long rolled rubber sheet having tapered portions on both sides in the width direction, which is not formed from a die having an opening shape approximate to a cross-sectional shape along the width direction of the rolled rubber sheet. While rotating the pair of rollers in the first step of extruding the vulcanized rubber and the gap portion that approximates the cross-sectional shape along the width direction of the rolled rubber sheet formed between the pair of rollers of the roller head And a second step of rolling the unvulcanized rubber extruded from the die without forming a rubber bank.
[0010]
Next, the operation of the rubber rolling method according to claim 1 will be described.
[0011]
First, in a 1st process, an unvulcanized rubber member is extruded from the nozzle | cap | die of an extruder. The opening shape of the die approximates the cross-sectional shape along the width direction of a rolled rubber sheet provided with tapered portions on both sides in the width direction that gradually decrease in thickness toward the end in the width direction. For this reason, the cross-sectional shape in the width direction of the unvulcanized rubber member extruded from the die approximates the cross-sectional shape along the width direction of the rolled rubber sheet (that is, the thickness gradually decreases toward the end in the width direction). Taper on both sides in the width direction).
[0012]
Next, the unvulcanized rubber member extruded from the die is rolled by a pair of rollers rotated by a roller head.
[0013]
During rolling, the unvulcanized rubber member extruded from the die is similarly rolled at a gap portion that approximates the cross-sectional shape along the width direction of the rolled rubber sheet.
[0014]
At this time, since no rubber bank is formed in the roller head, the rolling direction (rubber orientation) is uniform across the width direction, the amount of sheet shrinkage generated after rolling is uniform across the width direction, and the taper portion after cooling Thus, a rolled rubber sheet having good properties can be obtained.
[0015]
Also, since no rubber bank is formed on the roller head, unnecessary unvulcanized rubber is not adhered to the roller surface, and foreign matter (unnecessary unvulcanized rubber peeled off from the roller surface) can be adhered to the rolled rubber sheet. No.
[0016]
In the rubber rolling method according to claim 1, “a rubber bank is not formed on the roller head”, but a very small amount of rubber bank (for example, rubber extrusion amount) in a range where no undulation occurs in the taper portion of the obtained rubber sheet. Or the difference in the number of rotations of the roller head, etc.), this is synonymous with "no rubber bank is formed in the roller head" in the present invention.
[0017]
In the invention according to claim 2, the unvulcanized rubber extruded from the die of the extruder is rolled with a roller head composed of a pair of rotating rollers, and the thickness gradually decreases toward the end in the width direction. A rubber rolling device for continuously obtaining a long rolled rubber sheet having tapered portions on both sides in the width direction, wherein the base has an opening shape that approximates a cross-sectional shape along the width direction of the rolled rubber sheet. And having a gap portion that approximates the cross-sectional shape along the width direction of the rolled rubber sheet between the pair of rollers, the amount of unvulcanized rubber extruded by the extruder per unit time, and The rotational speed of the pair of rollers is controlled by a control device so that a bank of unvulcanized rubber is not formed on the roller head.
[0018]
Next, the operation of the rubber rolling device according to claim 2 will be described.
[0019]
First, an unvulcanized rubber member is extruded from a die of an extruder. The opening shape of the die is approximated to the cross-sectional shape along the width direction of the rolled rubber sheet provided with tapered portions on both sides in the width direction with taper portions gradually decreasing in thickness toward the end in the width direction. The cross-sectional shape in the width direction of the unvulcanized rubber member approximates the cross-sectional shape along the width direction of the rolled rubber sheet (that is, the taper portion where the thickness gradually decreases toward the width direction end portion on both sides in the width direction. Prepared).
[0020]
Next, the unvulcanized rubber member extruded from the die is rolled by a pair of rollers rotated by a roller head.
[0021]
During rolling, the unvulcanized rubber member extruded from the die is similarly rolled at a gap portion that approximates the cross-sectional shape along the width direction of the rolled rubber sheet.
[0022]
At this time, since no rubber bank is formed in the roller head, the rolling direction (rubber orientation) is uniform across the width direction, the amount of sheet shrinkage generated after rolling is uniform across the width direction, and the taper portion after cooling Thus, a rolled rubber sheet having good properties can be obtained.
[0023]
Also, since no rubber bank is formed on the roller head, unnecessary unvulcanized rubber is not adhered to the roller surface, and foreign matter (unnecessary unvulcanized rubber peeled off from the roller surface) can be adhered to the rolled rubber sheet. No.
[0024]
It should be noted that the amount of unvulcanized rubber extruded by the extruder per unit time and the rotational speed of the pair of rollers are controlled by the control device so that a bank of unvulcanized rubber is not formed on the roller head.
[0025]
In the rubber rolling device according to claim 2, “a rubber bank is not formed on the roller head”, but a very small amount of rubber bank (for example, rubber extrusion amount) in a range in which no waviness occurs in the taper portion of the obtained rubber sheet. Or the difference in the number of rotations of the roller head, etc.), this is synonymous with "no rubber bank is formed in the roller head" in the present invention.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings.
[0027]
As shown in FIG. 1A, the rubber rolling device 10 of this embodiment includes a rubber extruder 12.
[0028]
This rubber rolling device 10 has a cross-sectional shape as shown in FIG. 1C in which the widthwise intermediate portion has a constant thickness, and both sides thereof have tapered portions that gradually decrease in thickness toward the widthwise ends. The rolled rubber sheet 42 is obtained.
[0029]
The base 14 of the rubber extruder 12 is formed with a laterally elongated opening 16 as shown in FIG. 2 through which unvulcanized rubber is extruded.
[0030]
The lower edge 18 of the opening 16 is in a straight line, the upper edge 20 is in a straight line with a central portion 20A parallel to the lower edge 18, and inclined surfaces 20B are formed at both ends thereof. Further, vertical portions 21 perpendicular to the lower edge 18 are formed at both ends of the opening 16.
[0031]
That is, the shape of the opening 16 is approximately approximate to the cross-sectional shape of the rolled rubber sheet 42.
[0032]
In the opening 16 of this embodiment, the lateral width W1 is 100 mm, the height H1 of the central portion is 1 mm, the height h of the vertical portion 21 is 0.5 mm, and the angle θ1 of the inclined surface 20B with respect to the lower edge 18 is 3 °.
[0033]
As shown in FIG. 1A, a roller head 22 is provided on the downstream side of the base 14 in the rubber extrusion direction.
[0034]
As shown in FIG. 3, the roller head 22 includes an upper roller 24 and a lower roller 26.
[0035]
The lower roller 26 has a constant diameter in the axial direction.
[0036]
A groove 28 is formed in the upper roller 24 at an intermediate portion in the axial direction.
[0037]
The groove 28 has a central portion 28A having a constant depth, and both end portions are inclined surfaces 28B that gradually decrease in depth.
[0038]
In the present embodiment, the groove width W2 is 98 mm, the groove depth H2 at the center is 0.8 mm, and the angle θ2 (with respect to the rotation axis) of the inclined surface is 3 °.
[0039]
The upper roller 24 and the lower roller 26 are in contact with each other at an outer peripheral portion other than the groove 28, and a gap portion formed by the groove 28 and the lower roller 26 serves as a molding part 30 for rolling the unvulcanized rubber. The rolled rubber sheet 42 has a shape approximately similar to the cross-sectional shape.
[0040]
The upper roller 24, the lower roller 26, and the screw 32 of the rubber extruder 12 are each rotated by a motor (not shown).
[0041]
As shown in FIG. 4, the motor 34 that rotates the upper roller 24 and the lower roller 26 and the motor 36 that rotates the screw 32 of the rubber extruder 12 are connected to a control device 38, and the control device 38 is connected to the motor 34. The number of rotations and the number of rotations of the motor 36 are controlled.
(Function)
Next, the operation of the rubber rolling device 10 of this embodiment will be described.
[0042]
First, a sheet-like unvulcanized rubber member 40 is extruded from the opening 16 of the base 14 of the rubber extruder 12.
[0043]
The cross-sectional shape in the width direction of the unvulcanized rubber member extruded from the base 14 (see FIG. 1B) approximates the cross-sectional shape along the width direction of the rolled rubber sheet 42, and from the opening 16 of the base 14. Both the width and the thickness are slightly increased.
[0044]
It should be noted that the vertical portions 21 having a height h of 0.5 mm are provided at both ends of the opening 16 because the unvulcanized rubber is not completely extruded if the height dimension near both ends (tapered tip) is too small. This is because there is a possibility of occurrence.
[0045]
The height h of the vertical portion 21 is experimentally determined and set so that the extrusion can be performed uniformly.
[0046]
The unvulcanized rubber member extruded from the base 14 is rolled by the roller head 22.
[0047]
At this time, the control device 38 controls the motor 36 of the rubber extruder 12 and the motor 34 of the roller head 22 so that a rubber bank is not formed on the roller head 22.
[0048]
In the present embodiment, the unvulcanized rubber member 40 extruded from the base 14 is similar to the cross-sectional shape along the width direction of the rolled rubber sheet 42, and from the cross-sectional dimension along the width direction of the rolled rubber sheet 42. Is rolled in a slightly smaller forming part 30.
[0049]
By rolling without forming a rubber bank on the roller head 22, the rolling direction (arrow in FIG. 5) becomes uniform across the width direction of the rolled rubber sheet 42, and as a result, across the width direction of the rolled rubber sheet 42. The sheet shrinkage generated after rolling becomes uniform, and no ripples occur in the tapered portion after cooling, and a rolled rubber sheet 42 having good properties can be obtained.
[0050]
Further, since a rubber bank is not formed on the roller head 22, unnecessary unvulcanized rubber is not adhered to the roller surface, and foreign matter (unused unvulcanized rubber peeled off from the roller surface) does not adhere to the rolled rubber sheet 42. ) Is not attached.
[0051]
Note that, for example, a rubber bank with a very small amount of rollers may be formed on the head 22 due to an error in the amount of rubber extrusion or the rotational speed of the roller head. Even if such a small amount of rubber bank is formed, it falls within the category of “no rubber bank is formed on the roller head” in the present invention.
[0052]
【The invention's effect】
As described above, according to the rubber rolling method and the rubber rolling device of the present invention, a rolled rubber sheet having good properties having tapered portions on both sides in the width direction is continuously provided. It has an excellent effect that it can be obtained.
[Brief description of the drawings]
FIG. 1A is a side view of a rolling apparatus according to an embodiment of the present invention, and FIG. 1B is a cross-sectional view along the width direction of unvulcanized rubber discharged from a die, and FIG. ) Is a cross-sectional view along the width direction of a rolled rubber sheet rolled by a roller head.
FIG. 2 is a front view of a base.
FIG. 3 is a front view of a roller head.
FIG. 4 is a block diagram of an electric system.
FIG. 5 is an explanatory diagram showing a rolling direction.
6A is a side view of a conventional rolling machine for making a rubber bank, FIG. 6B is a front view of a base, FIG. 6C is a front view of another base, and FIG. 6D is rolled by a roller head. It is sectional drawing along the width direction of the rolled rubber sheet.
FIG. 7 is a cross-sectional view along the width direction of a rolled rubber sheet on which protrusions are formed.
8A is a side view of a conventional rolling machine that does not form a rubber bank, FIG. 8B is a cross-sectional view along the width direction of unvulcanized rubber discharged from the die, and FIG. 8C is a roller. It is sectional drawing along the width direction of the rolled rubber sheet rolled with the head.
FIG. 9 is an explanatory diagram showing a rolling direction in a conventional apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Rubber rolling apparatus 12 Rubber extruder 14 Base 22 Roller head 24 Upper roller 26 Lower roller 30 Molding part (gap part)
38 Control device 40 Unvulcanized rubber member 42 Rolled rubber sheet

Claims (2)

The unvulcanized rubber extruded from the die of the extruder is rolled with a roller head composed of a pair of rotating rollers, and tapered portions that gradually decrease in thickness toward the end in the width direction are provided on both sides in the width direction. A rubber rolling method for continuously obtaining a long rolled rubber sheet,
A first step of extruding unvulcanized rubber from a die having an opening shape similar to a cross-sectional shape along the width direction of the rolled rubber sheet;
Unvulcanized rubber extruded from the base while rotating the pair of rollers in a gap portion approximate to the cross-sectional shape along the width direction of the rolled rubber sheet formed between the pair of rollers of the roller head. A second step of rolling without forming a rubber bank;
A rubber rolling method comprising: The unvulcanized rubber extruded from the die of the extruder is rolled with a roller head composed of a pair of rotating rollers, and tapered portions that gradually decrease in thickness toward the end in the width direction are provided on both sides in the width direction. A rubber rolling device for continuously obtaining a long rolled rubber sheet,
The base has an opening shape that approximates a cross-sectional shape along the width direction of the rolled rubber sheet,
Between the pair of rollers, there is a gap portion that approximates the cross-sectional shape along the width direction of the rolled rubber sheet,
The amount of extrusion per unit time of the unvulcanized rubber by the extruder and the rotational speed of the pair of rollers are controlled by a control device so as not to form a bank of unvulcanized rubber on the roller head. A rubber rolling device characterized by.

Images