JP2019094134A - Rubber strip transport device - Google Patents

Abstract

To provide a rubber strip transport technology which can prevent the occurrence of trouble such as entanglement to a transfer belt even if an adhesion property of a rubber strip is high.SOLUTION: In a rubber strip transport device having a transfer belt for transferring a rubber strip which is extrusion-molded from a rubber extrusion machine, and a slit roller for forming a slit at the rubber strip, processing for reducing a contact area between the rubber strip and the transfer belt is applied to the transfer belt. In the transfer belt, an area in which the rubber strip directly contacts with the transfer belt is 20 to 60% with respect to an area of the rubber strip on the transfer belt.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a rubber strip conveying device used in the manufacture of a pneumatic tire.

  Recently, in the production of a pneumatic tire, a rubber strip is extruded from a rubber extruder, and the rubber strip is transported by a transport device and spirally wound on a wound body such as a forming drum or a rigid core. A strip-wind method of producing a low cover is adopted by rolling and attaching.

  FIG. 3 is a side view schematically showing a raw cover molding apparatus including a conventional rubber strip conveying apparatus. In FIG. 3, a rigid core is used as a body to be wound.

  As shown in FIG. 3, the raw cover molding apparatus includes a rubber extruder 1, a rubber strip conveying device 2 and a wound body 3. The rubber strip conveying device 2 is provided with the conveying belt 4 and the slit roller 5. The rubber composition introduced from the inlet 6 is kneaded by the rubber extruder 1, extruded from the outlet 7 as the rubber strip S, and then conveyed by the conveyor belt 4. Thereafter, the rubber strip S is conveyed to the wound body 3 via the slit roller 5, and is wound around and attached to the wound body 3 to form a low cover (for example, Patent Documents 1 to 6). 3).

Unexamined-Japanese-Patent No. 2016-052759 JP, 2016-150545, A JP, 2014-200928, A

  However, depending on the type of tire, a rubber strip with high adhesion may be used. In this case, the rubber strip is in close contact with the transport belt and becomes difficult to peel off, and when the rubber strip is delivered to the slit roller Problems such as the rubber strip getting caught in the belt may occur. In addition, even in the case of a normal adhesive rubber strip, when the ambient temperature rises, excessive adhesion may occur in the same manner.

  On the other hand, in the case where the body to be wound is a surface-treated rigid core, there may be a problem that the stuck rubber strip may come off from the rigid core due to the insufficient adhesion accompanying the surface treatment. Therefore, if it is attempted to change the composition so as to increase the tackiness of the rubber in order to suppress the peeling of the rubber strip from the rigid core, the rubber strip becomes more closely attached to the transport belt and the rubber strip is further involved. It was not easy to make such formulation changes, as it may be easier.

  For this reason, even when the adhesiveness of the rubber strip is high, there has been a demand for a technique that can prevent the occurrence of troubles such as winding in the conveyance belt.

  As a result of intensive studies to solve the above-mentioned problems, the present inventor has found that the above-mentioned problems can be solved by the invention described below, and has completed the present invention.

The invention according to claim 1 is
What is claimed is: 1. A rubber strip conveying apparatus comprising: a conveying belt for conveying a rubber strip extruded from a rubber extruder; and a slit roller for slitting the rubber strip,
It is a rubber strip conveying device characterized in that the conveying belt is processed to reduce the contact area with the rubber strip.

The invention according to claim 2 is
2. The conveyor belt according to claim 1, wherein the area of the rubber strip in direct contact with the conveyor belt is 40 to 80% of the area of the rubber strip on the conveyor belt. It is a rubber strip conveying apparatus as described.

The invention according to claim 3 is
The rubber according to claim 1 or 2, wherein a contact area with the rubber strip is reduced by providing a groove parallel to the transport direction of the rubber strip on the surface of the transport belt. It is a strip transport device.

The invention according to claim 4 is
The rubber strip conveying device according to claim 3, wherein a plurality of grooves parallel to the conveying direction of the rubber strip are formed.

The invention according to claim 5 is
The contact area with the rubber strip is reduced by providing a plurality of opening holes in the surface of the transport belt in parallel with the transport direction of the rubber strip. It is a rubber strip conveying apparatus as described in 2.

The invention according to claim 6 is
The rubber strip conveying device according to claim 5, wherein the opening holes are provided in a plurality of rows.

The invention according to claim 7 is
The rubber strip conveying apparatus according to any one of claims 1 to 6, wherein a cooling roll for cooling the rubber strip is provided between the rubber extruder and the slit roller. It is.

The invention according to claim 8 is
8. The rubber strip conveying device according to claim 7, wherein the cooling roll is disposed in the vicinity of a discharge port of the rubber extruder.

The invention according to claim 9 is
It is a rubber strip conveying apparatus according to claim 7 or 8, further comprising control means for controlling the surface temperature of the cooling roll to 0 to 25 ° C.

  According to the present invention, it is possible to provide a rubber strip conveying technique capable of preventing the occurrence of troubles such as winding in the conveyance belt even when the adhesion of the rubber strip is high.

BRIEF DESCRIPTION OF THE DRAWINGS It is a side view which shows typically the rubber member forming apparatus for tires provided with the rubber strip conveyance apparatus which concerns on one embodiment of this invention. The rubber strip conveyance apparatus which concerns on one embodiment of this invention WHEREIN: It is a figure which shows the example of the process provided with respect to the conveyance belt. It is a side view showing typically a rubber member molding device for tires provided with the conventional rubber strip conveying device.

[1] History of the Present Invention In the conventional rubber strip conveying apparatus, the inventor of the present invention is that the rubber strip is taken into contact with the conveying belt and the rubber strip is in close contact with the conveying belt. Since it is a cause, the method of suppressing the over-adhesion to the conveyance belt of a rubber strip was examined.

  As a result, in the rubber strip conveying device, if the conveying belt is processed to reduce the contact area between the rubber strip and the conveying belt, excessive adhesion of the rubber strip to the conveying belt is suppressed, and the rubber is suppressed. It has been found that it is possible to prevent the strip from being caught in the transport belt, and the present invention has been completed.

  That is, the rubber strip conveying apparatus according to the present invention is characterized in that the conveying belt is processed to reduce the contact area between the rubber strip and the conveying belt.

[2] Embodiments of the Present Invention Hereinafter, the present invention will be specifically described based on the embodiments.

(1) Outline of rubber strip conveying apparatus FIG. 1 is a side view schematically showing a tire rubber member forming apparatus provided with the rubber strip conveying apparatus according to the present embodiment. As shown in FIG. 1, the rubber strip conveying device 2 according to the present embodiment includes a conveying belt 4 and a slit roller 5, and is installed on the downstream side of the rubber extruder 1.

  As described above, the rubber composition fed from the feeding port 6 of the rubber extruder 1 is extruded into a rubber strip from the discharge port 7 of the rubber extruder 1 and then the conveying belt 4 of the rubber strip conveying device 2 is It is conveyed to the body to be wound 3 and attached, and a raw cover is formed.

  The above configuration and operation are basically the same as the conventional rubber strip conveying device, but as described above, the rubber strip conveying device 2 according to the present invention has a contact area between the rubber strip S and the conveying belt 4. It is different from the conventional rubber strip conveying device in that the conveying belt 4 is subjected to processing to make it smaller and to suppress over-adhesion of the rubber strip to the conveying belt.

(2) Conveying Belt Hereinafter, the conveying belt which is a characterizing portion of the rubber strip conveying device according to the present embodiment will be described. As shown in FIG. 1, the transport belt 4 is configured such that a non-stretchable endless belt is wound around a roll.

  In the present embodiment, as described above, the conveying belt 4 is processed to reduce the contact area between the rubber strip and the conveying belt. As a result, excessive adhesion of the rubber strip S to the transport belt 4 can be suppressed, so that occurrence of troubles such as being caught in the transport belt 4 can be prevented even if the rubber strip S has high adhesiveness. be able to.

  In addition, even when the surface-treated rigid core is used as the body to be wound 3 and the composition is changed so as to increase the adhesiveness of rubber in order to suppress peeling of the rubber strip from the rigid core, Excessive close contact with the conveyance belt 4 can be suppressed, and the occurrence of troubles such as winding in the conveyance belt 4 can be prevented.

  At this time, the contact area between the rubber strip S and the transport belt 4 is such that the area in which the rubber strip S is in direct contact with the transport belt 4 is 40 to 80 with respect to the area of the entire rubber strip S on the transport belt 4. % Is preferred. If it exceeds 80%, the over-adhesion can not be sufficiently suppressed, and there is a possibility that the occurrence of troubles such as entrainment in the conveyance belt 4 can not be sufficiently prevented. On the other hand, if it is less than 40%, the adhesion of the rubber strip S to the transport belt 4 becomes too low, and the rubber strip S meanders during transport, and the winding around the wound body 3 is disturbed. There is a risk that stable low cover molding can not be performed. More preferably, it is 40 to 50%.

  FIG. 2 is a view showing an example of processing applied to the transport belt in order to reduce the contact area between the rubber strip and the transport belt described above, and four processing examples of (1) to (4) Is listed.

  In FIG. 2, (1) is a “center-concave type” transport belt in which the contact area with the rubber strip is reduced by providing a groove 8 at the center of the transport belt 4. And (2) is a conveyance belt of a "central convex type" which made the contact area with a rubber strip small by providing convex part 9 in the central part. (3) is a "multi-groove type" conveyance belt in which the contact area with the rubber strip is reduced by providing a plurality of grooves 8 in the conveyance belt 4. Furthermore, (4) is a "pierced type" conveying belt in which the contact area with the rubber strip is reduced by providing a plurality of opening holes 11. In (1) to (4), (a) is a plan view, and (b) is an XY sectional view of (a).

  As shown in FIG. 2, by providing such grooves and opening holes in parallel with the conveying direction of the rubber strip, the contact area with the conveyed rubber strip is reduced, and therefore the rubber strip is closely attached to the conveying belt. Can be suppressed.

  In addition, FIG. 2 is an illustration to the last, and as long as it is possible to appropriately suppress the over-adhesion of the rubber strip to the transport belt, how to make the contact area with the transported rubber strip small Alternatively, the above-mentioned opening holes may be provided over a plurality of rows.

(3) Cooling roll When attaching the rubber strip to the rigid core, conventionally, the slit was attached when the rubber was in a warm state, but the rubber strip shrinks and slits as time passes. There was a problem that could break from the position.

  As a method of preventing the occurrence of such troubles, it may be considered that the occurrence of shrink in the rubber strip has already been completed when the rubber strip is attached to the rigid core. That is, in the case of a rubber strip in which the occurrence of shrink has been completed, the rubber strip does not break from the slit position because the shrinkage no longer occurs even if time passes.

  As described above, when the contact area between the rubber strip and the transport belt is reduced, the rubber strip can be cooled to a certain extent to generate shrink during transport. However, the cooling can not be said to be sufficient, and merely reducing the contact area between the rubber strip and the conveyor belt sufficiently suppresses the cracking of the rubber strip that occurs when the rubber strip is attached to the rigid core. I can not In addition, for example, in the case of the above-described “center-concave type” conveyor belt, when slitting in the concave portion, the slit may not enter.

  Therefore, in the present embodiment, as shown in FIG. 1, a cooling roll 10 for cooling the rubber strip S is further provided between the rubber extruder 1 and the slit roller 5.

  As described above, by providing the cooling roll 10 between the rubber extruder 1 and the slit roller 5, when the slit is made in the rubber strip S in the slit roller 5, the rubber strip S is already sufficiently cooled and shrunk. Therefore, after sticking to the rigid core, it is possible to suppress the occurrence of troubles such as cracking from the slit position.

  The position at which the cooling roll 10 is disposed is not limited as long as it is between the rubber extruder 1 and the slit roller 5, but is preferably disposed in the vicinity of the discharge port 7 of the rubber extruder 1.

  By arranging the cooling roll 10 in the vicinity of the discharge port 7 of the rubber extruder 1, the extruded rubber strip S is immediately cooled and delivered to the conveying roll 4, and then conveyed on the conveying roll 4 In the meantime, the sheet is sufficiently shrunk and delivered to the slit roller 5. For this reason, the rubber strip S in which the slit is inserted in the slit roller 5 will no longer shrink and will not generate a crack at the slit position even after being attached to the rigid core.

  In addition, as surface temperature of a cooling roll, it is preferable that it is 0-25 degreeC. If the temperature is less than 0 ° C., the film may be too cooled, the rubber may become hard, and the slit may not be formed. On the other hand, if the temperature is higher than 25 ° C., sufficient cooling may not be performed, and cracking of the rubber strip may occur after attachment, or adhesion of the rubber strip to the slit roller may occur. It is more preferable that it is 10-20 degreeC.

  Hereinafter, the present invention will be more specifically described based on examples and comparative examples.

1. Experiment 1
In this experiment, in order to reduce the contact area to the rubber strip, an experiment was conducted on the suppression effect of the over-adhesion trouble due to the difference in the processing applied to the conveyor belt.

  Specifically, four types of conveyor belts are prepared in which the area in which the rubber strip is in direct contact with the conveyor belt is 70% of the area of the rubber strip on the conveyor belt, as shown in FIG. It attached to the rubber strip conveyance device shown, and the occurrence of the over adhesion trouble was evaluated.

  Specifically, the four types of conveyor belts shown in FIG. 2, that is, (1) center concave type conveyor belts, (2) center convex type conveyor belts, and (3) multiple groove (two) type A conveyor belt and (4) a perforated (50 pcs / m) type conveyor belt were prepared, and the rubber strip was conveyed in the same manner using each conveyor belt, and the number of occurrences of over-adhesion problems was evaluated. In addition, the cooling roll was not provided here.

  In addition, in the case of evaluation, it evaluated also about how to put the slit in the rubber strip in a slit roller.

  As for the evaluation, the over-adhesion trouble was evaluated as “good” when the number of occurrences was greatly reduced compared to the conventional case, “good” when reduced to some extent, and “not good” when equivalent. Moreover, about how to put a slit, when the slit did not enter was evaluated as "not good", and when it entered, it was evaluated as "good."

  The results of the evaluation are shown in Table 1.

  From Table 1, regarding the over-adhesion trouble, it was confirmed that the number of occurrences was reduced compared to the prior art, regardless of which type of conveyor belt. However, in the case of the "central convex type" conveyance belt, the rubber strip was in contact only at the central portion, and the rubber strip was meandered, so it was evaluated as "OK". Also, with the "perforated type" conveyor belt, although over-adhesion problems could be reduced, it was not enough and was evaluated as "OK".

  On the other hand, with regard to how the slit is inserted, there is a problem except that it is evaluated as "impossible" because the slit does not enter because the center portion is recessed and the slit does not enter because of the "center recessed type" conveyor belt. It was evaluated as "good".

  From the above results, it has been confirmed that the "multi-groove type" conveying belt is the most preferable type.

2. Experiment 2
In Experiment 1, regarding the over-adhesion trouble, it was found that the “multiple groove type” transport belt is most preferable, and next, an appropriate ratio of the contact area with the rubber strip was evaluated.

  Specifically, the contact area with the rubber strip was changed from 35% to 85% using the “multi-groove type” conveyor belt used in Experiment 1, and the effect of reducing the over-adhesion trouble was evaluated. The results are shown in Table 2.

  In Table 2, when the contact area was 35%, the floating of the rubber strip occurred and the meandering occurred, so it was evaluated as "OK". When the contact area was 85%, the over-adhesion trouble reduction effect was not yet sufficient, so it was evaluated as "OK".

  From this result, it has been confirmed that the contact area is preferably 40 to 80%.

3. Experiment 3
In this experiment, the effect of the cooling roll was evaluated.

  Specifically, when the rubber strip is transported to the rigid core via the slit roller using the “multi-groove type” transport belt (contact area 70%) used in Experiment 1, FIG. The surface temperature was changed to -10-40 degreeC while arrange | positioning a cooling roll in the position shown to, and it was evaluated how much generation | occurrence | production of the crack trouble of the rubber strip after bonding reduced. At the same time, evaluation was also made as to how the slit is formed in the slit roller.

  The results are shown in Table 3.

  In Table 3, with respect to the strip cracking trouble, when the temperature of the cooling roll was 30 ° C. or more, the occurrence of the strip cracking was partially observed and was evaluated as “not good”.

  Moreover, regarding how to put in a slit, at -10 degreeC, since rubber | gum was cooled too much and the slit did not enter, it evaluated as "improper." In addition, since adhesion to the slit roller occurred at 40 ° C., it was evaluated as “not acceptable”.

  From this result, it has been confirmed that the occurrence of strip cracking can be suppressed by appropriately setting the surface temperature to 0 to 25 ° C. using a cooling roll.

  As mentioned above, although the present invention was explained based on an embodiment, the present invention is not limited to the above-mentioned embodiment. Various modifications can be made to the above embodiment within the same and equivalent scope of the present invention.

DESCRIPTION OF SYMBOLS 1 rubber extrusion machine 2 rubber strip conveyance apparatus 3 to-be-wound body 4 conveyance belt 5 slit roller 6 input port 7 discharge port 8 groove 9 convex part 10 cooling roll 11 opening hole S rubber strip

Claims (9)

What is claimed is: 1. A rubber strip conveying apparatus comprising: a conveying belt for conveying a rubber strip extruded from a rubber extruder; and a slit roller for slitting the rubber strip,
A rubber strip conveying device characterized in that the conveying belt is processed to reduce the contact area with the rubber strip.   2. The conveyor belt according to claim 1, wherein the area of the rubber strip in direct contact with the conveyor belt is 40 to 80% of the area of the rubber strip on the conveyor belt. Rubber strip conveying apparatus as described.   The rubber according to claim 1 or 2, wherein a contact area with the rubber strip is reduced by providing a groove parallel to the transport direction of the rubber strip on the surface of the transport belt. Strip transport device.   4. The rubber strip conveying device according to claim 3, wherein a plurality of grooves parallel to the conveying direction of the rubber strip are formed.   The contact area with the rubber strip is reduced by providing a plurality of opening holes in the surface of the transport belt in parallel with the transport direction of the rubber strip. The rubber strip conveying device according to 2.   The rubber strip conveying device according to claim 5, wherein the opening holes are provided in a plurality of rows.   The rubber strip conveying apparatus according to any one of claims 1 to 6, wherein a cooling roll for cooling the rubber strip is provided between the rubber extruder and the slit roller. .   The rubber strip conveying device according to claim 7, wherein the cooling roll is disposed in the vicinity of the discharge port of the rubber extruder.   The rubber strip conveying apparatus according to claim 7 or 8, further comprising control means for controlling the surface temperature of the cooling roll to 0 to 25 ° C.

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