JP2968457B2 - Calendar roll - Google Patents

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 or other 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 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 an apparatus for manufacturing this sheet, a calendar apparatus 1 illustrated in FIG. 9 is used. This device 1 includes a first roll 2, a second roll 3,
A calendar roll including a roll 4 and a fourth roll 5,
And a guide roll group 6.

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
After being formed into a sheet 8 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, the sheet 8 is carried out through the group of guide rolls 6.

[0004]

In the above-mentioned conventional apparatus 1, the calendar rolls 2 to 4 are used for calendaring.
Air accumulates between the sheet 5 and the sheet 8, and the length of the sheet in the longitudinal direction of the calender is set to 100% of the length of the portion without the air accumulation.
In this case, a portion having an air pocket becomes longer than 100.5, and the flatness of the sheet is reduced, for example, an air mark is generated.

In view of the above, a method has been proposed for eliminating the air mark by embossing the embossed sheet on the back surface of the surface in contact with the bottom roll (fourth roll 5) (see Japanese Patent Application Laid-Open No. 63-197614). However, it is not applicable to any other than the embossed sheet. In addition, a device in which a helical groove is provided in a heating roll has been proposed (see Japanese Utility Model Application Laid-Open No. 62-159606). This groove, when the roll diameter is 70 mm, groove width 10 mm, groove depth 10 mm,
The spiral angle is about 30 degrees.

However, when such a roll having grooves is used as the final roll of a calender roll,
There is a problem that unevenness is generated on the sheet surface, and, in addition to the final roll, unevenness is generated, and when the uneven shape is rolled between rolls of the next stage, a difference occurs in the compressive force of the plastic material due to the unevenness, Defective products such as wrinkles and warping are likely to occur in the formed sheet. In particular, in the case of a rubber sheet for an inner liner or the like used as a tire member, these defects and large irregularities undesirably lead to defects in the tire product.

SUMMARY OF THE INVENTION The present invention has been made in view of the above situation, and has as its object to prevent air from flowing between a calender roll and a material to be rolled without a plastic material entering a groove. To prevent the occurrence of air marks, etc.
An object of the present invention is to provide a calendar roll capable of obtaining a high 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, wherein the calender roll has a groove on the outer peripheral surface thereof.
It is characterized by a depth of 0.01 to 2.0 mm and a depth of 0.01 to 2.0 mm.

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

Further, according to the present invention, the groove extends from a substantially central portion in the axial direction of the calender roll toward both ends in the axial direction of the calender roll, and is inclined in the same direction as the rotation 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 set to 0.01 to 1.
The reason for setting it to 0 mm is that if it is less than 0.01 mm, air cannot be effectively discharged, and if it exceeds 1.0 mm, the air discharging effect cannot be improved, and irregularities are likely to be generated on the product surface. . In addition, the reason why the groove depth is set to 0.01 to 2.0 mm is that if the groove depth is less than 0.01 mm, air cannot be effectively discharged, and if the groove depth exceeds 2.0 mm, the air discharging effect does not increase so much. This is because foreign matter, rubber, and the like are caught, and the removal operation is troublesome.

The inclination angle of the groove with respect to the generatrix is 10
The reason why it is not less than 10 degrees is that if it is less than 10 degrees, it is difficult for air to be discharged in the rotation direction of the roll, and the air discharging effect becomes insufficient. Furthermore, the first with respect to the calendar roll busbar
The reason for setting the difference between the inclination angle of the groove and the second groove to 30 to 90 degrees is that if it is less than 30 degrees, the air discharging effect is insufficient, and
The range of 0 to 90 degrees is more preferable.

[0012]

According to the present invention, air entrained between a calender roll surface and a material to be rolled can be effectively discharged through a groove provided on the roll surface, and the air is discharged to the surface of a sheet-like or film-like product. No defects such as marks 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. The calender roll 11 has a predetermined interval S (in the range of 10 to 100 mm, preferably 20 to 70 m) on the outer peripheral surface in the axial direction.
m range) is provided in the circumferential direction orthogonal to the roll generatrix. The groove 12 is for discharging air, and has a width W of 0.01 to 1.0 mm (preferably 0.01 to 1.0 mm).
０．０0.08 mm) and the depth D is 0.01 to 2.0 m
m (preferably 0.05 to 1.0 mm).

If the distance S between adjacent grooves 12 (measured in a direction perpendicular to the grooves 12) is less than 10 mm, the air discharging effect is not sufficiently increased, and the cost of processing the roll grooves increases only. If it exceeds, a sufficient air discharge 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 according to the present invention.
(B) is a V-shape, (c) is a dovetail shape,
It is preferable that the groove width W, the groove depth D, and the groove interval S are designed in 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. This is the point provided in the inclined shape, and the same effect as in 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 a value within a range of 0 degree or more and less than 90 degrees. That is,
If the inclination angle α of the groove 12 is set to 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 an air mark may be generated. There is.

FIG. 4 shows a case where the inclination angle α of the groove 12 is large, and FIG. 5 shows a case where the inclination angle α of the groove 12 is small. 6 and 7 show a third embodiment of the present invention. The difference from the second embodiment is that the grooves 12 extend from the substantially central portions in both axial directions of the calender roll 11 toward both ends, respectively. The air can be 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 at the center in the axial direction are too close, and when the inclination angle α1 is less than 20 degrees, it is difficult for the air to be discharged in the rotation direction. Groove 1
2 is preferably connected to the left and right inner ends at a central portion in the axial direction to form a continuous angled groove.
The air discharge effect at the axial center is increased.

FIG. 7 shows an example in which a single groove 12C extending in the circumferential direction is provided at the central portion in the axial direction of the calender roll 11, and the presence of the groove 12C reduces the air in the central portion in the axial direction which is difficult to discharge. Can be discharged. FIG.
The 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 in the second embodiment) and a second groove 12B intersecting the first groove 12A are provided. The air can be discharged in a timely and effective manner from the roll rotation direction to the axial direction, and the discharge effect can be greatly improved.

The inclination angle α of the first groove 12A with respect to the generatrix M and the inclination angle α of the second groove 12B with respect to the generatrix M
The difference (α−α2) of 2 is 30 to 90 degrees, preferably 60 to 90 degrees.
A range of 90 degrees is preferable. Note that the angle difference (α−α2) is 30
If the temperature is lower than the degree, the above-described air discharging effect cannot be expected. The groove shapes in the second to fourth embodiments can adopt the shapes shown in FIGS.
Can also be selected within the above range.

The present invention is not limited to the above embodiment, and the design can be changed as appropriate, for example, by providing one groove spirally instead of providing a large number of grooves 12 in the axial direction of the calender roll 11. In addition, an intermediate calender roll or all rolls can be used arbitrarily as well as a final calender roll in a calender device.

[0021]

As described above, the present invention relates to a calender roll for processing a plastic material into a sheet or film having an arbitrary thickness, wherein the calender roll has a groove on the outer peripheral surface thereof. 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 the rolling are performed. The air between the sheet or the film to be discharged can be discharged smoothly and effectively, and a high quality product can be manufactured by preventing the occurrence of defects such as wrinkles and warping as well as air marks on the product surface. .

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 generatrix of the calender roll of 10 to 90 degrees. Air discharge in the direction can be made smooth. The present invention is characterized in that the groove is the first
A groove and a second groove intersecting the groove, wherein an angle formed between the longitudinal direction of the second groove and the generatrix of the calender roll is smaller than an angle formed between 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 °, the angle between the longitudinal direction of the second groove and the generatrix of the calender roll is 0 ° to 60 °, and 1. The difference in angle between each of the first and second grooves is 30 to 90 degrees, so that air can be smoothly and effectively discharged in the rotation direction to the axial direction of the calender roll. Can be.

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

[Brief description of the drawings]

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

FIG. 2 is a sectional view showing a shape of a groove in the embodiment.

FIGS. 3A, 3B, and 3C are cross-sectional views showing other examples of the shape of the groove in the 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.

[Description of Signs] 11 Calender Roll 12 Groove 12A Groove 12B Groove 12C Groove D Groove Depth W Groove Width M Roll Bus α The angle (tilt angle) between the roll bus and the groove α1 The angle (the tilt) between the roll bus and the groove Angle) α2 Angle between the roll generatrix and groove (tilt angle)

Claims (4)

(57) [Claims] 1. A calender roll for processing a plastic material into a sheet or film having an arbitrary thickness, wherein the calender roll has a groove on an outer peripheral surface thereof, the groove having a width of 0.01 to 1.0 mm. A calender roll having 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 generating line of 10 to 90 degrees. 3. The groove comprises a first groove and a second groove intersecting the first groove. The 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. And the angle between the longitudinal direction of the first groove and the generatrix of the calender roll is 30 to 90 degrees.
Degree, 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,
2. The calender roll according to claim 1, wherein a difference between respective angles of the calender roll and the second groove is 30 to 90 degrees. 4. The groove extends from a substantially central portion in the axial direction of the calender roll toward both ends in the axial direction of the calender roll, and is inclined in the same direction as the rotation direction with respect to the generatrix of the calender roll. Claim 1 characterized by the following:
Calendar roll described in.