JPH091575A - Calendar roll - Google Patents

Abstract

PURPOSE: To effectively discharge air from a space between a calendar roll and a plastic material being rolled without allowing the plastic material to enter a groove. CONSTITUTION: A calendar roll 11 for rolling a plastic material into a sheet or film-shaped article has a groove 12 on its outer peripheral surface. The groove 12 has a width W of 0.01-1.0mm and a depth D of 0.01-2.0mm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a calender roll for processing a plastic material such as rubber or synthetic resin into a sheet or film having an arbitrary thickness.

[0002]

2. Description of the Related Art Generally, in the tire manufacturing industry, a sheet-like material (for example, a rubber sheet for an inner liner) made of a plastic material such as rubber or synthetic resin is used as an intermediate member of a tire. As a device for manufacturing this sheet, a calendar device 1 exemplified in FIG. 9 is used. This device 1 includes a first roll 2, a second roll 3 and a third roll 3.
A calender roll consisting of roll 4 and fourth roll 5,
It is composed of a guide roll group 6.

Then, the first roll 2 and the second roll 3
The compound (plastic material) compounded and kneaded in the previous step is supplied to the gap between the first bank 7 and the first bank 7.
The bank 7 rolled between the roll 2 and the second roll 3 is
The sheet 8 is passed through the gap between the second roll 3 and the third roll 4 and the gap between the third roll 4 and the fourth roll 5, and is then conveyed through the group of guide rolls 6.

[0004]

By the way, in the above conventional apparatus 1, the calender rolls 2 to
Air is accumulated between the sheet 5 and the sheet 8, and the length of the sheet in the longitudinal direction of the calender is 100.
In that case, the portion having air pockets becomes longer than 100.5, and the flatness of the sheet is deteriorated due to the generation of air marks, which is a quality problem.

Therefore, as for the embossed sheet, a method has been proposed in which the air mark is eliminated by embossing the back surface of the surface in contact with the bottom roll (fourth roll 5) (see JP-A-63-197614). However, it is not applicable to other than embossed sheets. Further, a heating roll provided with a spiral groove has also been proposed (see Japanese Utility Model Laid-Open No. 62-159606). When the roll diameter is 70 mm, this groove has a groove width of 10 mm, a groove depth of 10 mm,
The helix angle is about 30 degrees.

However, when such a grooved roll is used as the final roll of the calender roll,
There is a problem that unevenness occurs on the surface of the sheet, and also in other than the final roll, unevenness occurs, and when the uneven shape is rolled between the rolls in the next stage, a difference occurs in the compressive force of the plastic substance due to the unevenness, Defective products such as wrinkles and distortions are likely to occur on the formed sheet. In particular, in the case of a rubber sheet for an inner liner used as a tire member, these defects and large irregularities are not preferable because they lead to defects in tire products.

The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to prevent air between a calender roll and a material to be rolled without allowing a plastic material to enter a groove. Discharge to prevent the generation of air marks, etc.
It is to provide a calendar roll that can obtain a good quality product.

[0008]

According to the present invention, the following technical measures have been taken in order to achieve the above object. That is, the present invention relates to a calender roll for processing a plastic material into a sheet or film having an arbitrary thickness, which has a groove on the outer peripheral surface of the roll, and the groove has a width of 0.01.
It is characterized in that the depth is 0.01 mm to 2.0 mm and the depth is 0.01 mm to 2.0 mm.

Further, the present invention is characterized by having at least a first groove having an angle between the longitudinal direction of the groove and the calender roll generatrix of 10 to 90 degrees. And
In the present invention, the groove comprises a first groove and a second groove intersecting with the first groove, and an angle between the longitudinal direction of the second groove and the generatrix of the calender roll is defined by the longitudinal direction of the first groove and the generatrix of the calender roll. The angle between the longitudinal direction of the first groove and the generatrix of the calender roll is 30 to 90 degrees,
The angle between the longitudinal direction of the second groove and the generatrix of the calender roll is 0 to 60 degrees, and the generatrix and the first and second
It is characterized in that the difference between the respective angles with the groove is set to 30 to 90 degrees.

Further, according to the present invention, the groove extends from substantially the central portion of the calender roll in the axial direction toward both ends of the calender roll in the axial direction, and is inclined in the same direction as the rotational direction with respect to the generatrix of the calender roll. It is characterized by doing. In the present invention, the width of the groove is 0.01 to 1.
The reason why 0 mm is set is that if it is less than 0.01 mm, the air cannot be effectively discharged, and if it exceeds 1.0 mm, the air discharging effect cannot be enhanced and unevenness is likely to occur on the product surface. . Further, the groove depth of 0.01 to 2.0 mm means that the air cannot be effectively discharged if it is less than 0.01 mm, and the air discharging effect does not so much increase even if it exceeds 2.0 mm. This is because foreign matter, rubber, etc. are caught and the removal work is troublesome.

The inclination angle of the groove with respect to the generatrix is 10
The reason for setting the degree to 10 degrees or more is that if it is less than 10 degrees, it is difficult to discharge air in the rotation direction of the roll, and the air discharging effect becomes insufficient. Furthermore, the first for the busbar of the calendar roll
The reason why the difference in inclination angle between the groove and the second groove is 30 to 90 degrees is that if the angle is less than 30 degrees, the air discharging effect is insufficient.
The range of 0 to 90 degrees is more preferable.

[0012]

According to the present invention, the air trapped between the surface of the calender roll and the material to be rolled can be effectively discharged through the grooves provided on the surface of the roll, and the air can be discharged onto the surface of the sheet or film product. No defects such as marks will occur.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a first embodiment of the present invention, in which the calender roll 11 has a predetermined axial interval S (range of 10 to 100 mm, preferably 20 to 70 m) on the outer peripheral surface.
In a range of m), a large number of grooves 12 are provided in the circumferential direction orthogonal to the roll generatrix. The groove 12 is for air discharge and has a width W of 0.01 to 1.0 mm (preferably 0.01 mm).
~ 0.08 mm) and the depth D is 0.01 to 2.0 m
It has a square groove shape with m (preferably 0.05 to 1.0 mm).

If the adjacent spacing S between the grooves 12 (measured in the direction perpendicular to the grooves 12) is less than 10 mm, the air discharge effect will not be sufficiently increased, and the roll groove machining cost will only increase. If it exceeds, sufficient air discharging effect cannot be obtained. Therefore, it is more preferable to design the groove interval in the range of 20 to 70 mm. FIG. 3 shows another example of the shape of the groove 12 in the present invention, (a) is a semicircular shape,
(B) is V-shaped, (c) is dovetail-shaped,
It is preferable that the groove width W, the groove depth D, and the groove interval S are designed within the above ranges.

FIGS. 4 and 5 show a second embodiment of the present invention. The difference from the first embodiment is that each groove 12 has a predetermined angle α with respect to the generatrix M of the calender roll 11 in a certain direction. Since it is provided in an inclined shape, the same effect as that of the first embodiment can be expected. The inclination angle α of the groove 12 with respect to the generatrix M is 10 degrees or more, preferably 3 degrees.
It is preferable to select in the range of 0 degrees or more and less than 90 degrees. That is,
When the inclination angle α of the groove 12 is 10 degrees or less, it becomes difficult for air to be discharged in the rotation direction of the roll 11, and especially when the sheet width is wide, the air discharging effect becomes insufficient and air marks may be generated. There is.

FIG. 4 shows the case where the inclination angle α of the groove 12 is large, and FIG. 5 shows the case where the inclination angle α of the groove 12 is small. 6 and 7 show a third embodiment of the present invention, which is different from the second embodiment in that the groove 12 extends from the substantially central portion in both axial directions of the calender roll 11 toward both ends, and has a V-shape. The air is effectively discharged from the center toward both side ends.

The inclination angle α1 of the groove 12 with respect to the generatrix M is preferably 20 to 80 degrees, more preferably 30 to 60 degrees. That is, when the inclination angle α1 is 80 degrees or more, the grooves on both sides of the central portion in the axial direction are too close to each other, and when the inclination angle α1 is less than 20 degrees, air is difficult to be discharged in the rotation direction. Groove 1
2, it is preferable that the left and right inner ends are connected to each other at the central portion in the axial direction to form a continuous chevron groove.
The air discharge effect at the central portion in the axial direction is enhanced.

FIG. 7 shows an example in which a single groove 12C extending in the circumferential direction is provided in the central portion of the calender roll 11 in the axial direction. Due to the presence of the groove 12C, air in the central portion in the axial direction, which is difficult to discharge, is effective. Can be discharged. FIG.
A fourth embodiment of the present invention is shown, which is different from the second embodiment in that a first groove 12A (corresponding to the groove 12 of the second embodiment) and a second groove 12B intersecting with the first groove 12A are provided. Air can be discharged from the roll rotation direction in the axial direction in a timely and effective manner, and the discharge effect can be greatly improved.

Then, the inclination angle α with respect to the generatrix M of the first groove 12A and the inclination angle α with respect to the generatrix M of the second groove 12B.
The difference of 2 (α-α2) is 30 to 90 degrees, preferably 60 to
A range of 90 degrees is good. The angle difference (α-α2) is 30
If it is less than 100 degrees, the above-mentioned air discharging effect cannot be expected. As the groove shape in the second to fourth embodiments, the shapes shown in FIGS. 2 and 3 can be adopted, and of course the dimensions D, W, S.
Can also be selected within the above range.

The present invention is not limited to the above-described embodiment, and the design can be changed as appropriate, such as providing one groove in a spiral shape instead of providing a large number of grooves 12 in the axial direction of the calender roll 11. In addition to the final calender roll in the calendering device, an intermediate calender roll or all rolls can be arbitrarily adopted.

[0021]

INDUSTRIAL APPLICABILITY As described above, the present invention is a calender roll for processing a plastic material into a sheet or film having an arbitrary thickness, which has grooves on the outer peripheral surface of the roll. Since the width is 0.01 to 1.0 mm and the depth is 0.01 to 2.0 mm, the plastic material to be calendered does not enter the groove, and the calender roll and rolling are performed. Air between the sheet or film can be discharged smoothly and effectively, and it is possible to manufacture good quality products by preventing the generation of defects such as wrinkles and distortions as well as air marks on the product surface. .

Further, since the present invention is characterized by having at least a first groove having an angle between the longitudinal direction of the groove and the calender roll generatrix of 10 to 90 degrees, rotation of the calender roll. Air can be smoothly discharged in the direction. In the present invention, the groove is the first
The groove comprises a groove and a second groove intersecting with the groove, and the angle formed by the longitudinal direction of the second groove and the generatrix of the calender roll is made smaller than the angle formed by the longitudinal direction of the first groove and the generatrix of the calender roll. The angle between the longitudinal direction of one groove and the generatrix of the calender roll is 30 to 90 degrees, the angle between the longitudinal direction of the second groove and the generatrix of the calender roll is 0 to 60 degrees, and the angle between the generatrix and the Since the difference between the angles formed by the first groove and the second groove is 30 to 90 degrees, the air can be smoothly and effectively discharged in the rotation direction of the calender roll to the axial direction. You can

Further, according to the present invention, the groove extends from substantially the central portion of the calender roll in the axial direction toward both ends of the calender roll in the axial direction, and is inclined in the same rotational direction with respect to the generatrix of the calender roll. Therefore, it is possible to effectively discharge the air that is difficult to be discharged from the central portion of the calender roll in the axial direction.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a shape of a groove in the example.

3 (a), (b) and (c) are cross-sectional views showing another example of the shape of the groove in the same embodiment.

FIG. 4 is a perspective view showing a second embodiment of the present invention.

FIG. 5 is a perspective view showing a modification of the second embodiment.

FIG. 6 is a perspective view showing a third embodiment of the present invention.

FIG. 7 is a perspective view showing a modification of the third embodiment.

FIG. 8 is a perspective view showing a fourth embodiment of the present invention.

FIG. 9 is a simplified configuration diagram showing an example of a calendar device.

[Explanation of symbols]

 11 Calender Roll 12 Groove 12A Groove 12B Groove 12C Groove D Groove Depth W Groove Width M Roll Busbar α Angle between Roll Busbar and Groove (Inclination Angle) α1 Angle Between Roll Busbar and Groove (Inclination Angle) α2 Roll Busbar Angle between the groove and the groove (tilt angle)

Claims (4)

[Claims] 1. A calendar roll for processing a plastic material into a sheet or film having an arbitrary thickness, wherein the roll has a groove on its outer peripheral surface, and the groove has a width of 0.01 to 1.0 mm. And a depth of 0.01 to 2.0 mm. 2. The calender roll according to claim 1, wherein the calender roll has at least a first groove having an angle between a longitudinal direction of the groove and a calender roll generatrix of 10 to 90 degrees. 3. The groove comprises a first groove and a second groove intersecting with the first groove, and an angle between a longitudinal direction of the second groove and a generatrix of the calender roll is defined by a longitudinal direction of the first groove and a calender roll generatrix. And the angle between the longitudinal direction of the first groove and the generatrix of the calender roll is 30 degrees to 90 degrees.
The angle between the longitudinal direction of the second groove and the generatrix of the calender roll is 0 to 60 degrees, and the generatrix and the first,
The calender roll according to claim 1, wherein a difference between respective angles formed by the second groove and the second groove is set to 30 to 90 degrees. 4. The groove extends from substantially the center of the calender roll in the axial direction toward both ends of the calender roll in the axial direction, and is inclined in the same direction as the rotational direction with respect to the generatrix of the calender roll. Claim 1 characterized by the above-mentioned.
Calendar roll described in.