Rubber strip manufacturing equipment

Abstract

To provide a rubber strip manufacturing apparatus capable of stably molding high-quality rubber strips.SOLUTION: A rubber strip manufacturing apparatus 1 includes an extruder 2 and a calendar head 3. The extruder 2 includes a die plate 7 having a molding opening 7a for extruding a rubber G1. The calendar head 3 includes a first calendar roll 8A placed on one side of pre-molded rubber G3 and a second calendar roll 8B placed on the other side. The first calendar roll 8A has a first molding surface 8a for molding the pre-molded rubber G3 into a rubber strip G2. The second calendar roll 8B has a second molding surface 8b for molding the pre-molded rubber G3 into the rubber strip G2. At least one of the first molding surface 8a and the second molding surface 8b presses only an edge part Ge on both sides of the pre-molded rubber G3 in the direction of an opening width W of the molding opening 7a to mold the rubber strip G2.SELECTED DRAWING: Figure 4

Description

Technical Field

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[0001] The present invention relates to a rubber strip manufacturing apparatus for forming a rubber strip using unvulcanized rubber.

Background Art

[0002] Conventionally, a rubber strip manufacturing apparatus for forming a rubber strip using unvulcanized rubber is known. For example, Patent Document 1 below proposes a rubber strip manufacturing apparatus having a calender roll in which the surface roughness is made different between the central region and the outer region of the forming surface to enhance the peelability of the rubber strip.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, even in the rubber strip manufacturing apparatus of Patent Document 1, when forming a rubber strip using highly adhesive rubber, the rubber strip may stick to one side of the calender roll, resulting in molding defects such as rubber breakage and deformation.

[0005] The present invention has been devised in view of the above actual situation, and the main object is to provide a rubber strip manufacturing apparatus capable of stably forming high-quality rubber strips.

Means for Solving the Problems

[0006] The present invention relates to a rubber strip manufacturing apparatus for forming rubber strips using unvulcanized rubber, comprising an extruder and a calender head disposed adjacent to the downstream side of the extruder in the extrusion direction, wherein the extruder includes a die plate having a molding port for extruding the rubber, the molding port having a predetermined opening width and an opening height smaller than the opening width, thereby continuously discharging the rubber as preformed rubber in the shape of a strip, the calender head includes a first calender roll disposed on one side of the preformed rubber and a second calender roll disposed on the other side in the direction of the opening height of the molding port, the first calender roll has a first molding surface for forming the preformed rubber into a rubber strip, and the second calender roll has a second molding surface for forming the preformed rubber into a rubber strip, and at least one of the first molding surface and the second molding surface presses only the edges on both sides of the preformed rubber in the direction of the opening width of the molding port to form the rubber strip. [Effects of the Invention]

[0007] The rubber strip manufacturing apparatus of the present invention, by having the above-described configuration, can stably mold high-quality rubber strips. [Brief explanation of the drawing]

[0008] [Figure 1] This is a side view showing a green tire manufacturing line incorporating the rubber strip manufacturing apparatus of the present invention. [Figure 2] Figure 1 is a cross-sectional view showing the main parts of the rubber strip manufacturing apparatus. [Figure 3] This is a front view of the die plate as seen from the extrusion direction. [Figure 4] This is a conceptual diagram of the calendar head as viewed from the extrusion direction. [Modes for carrying out the invention]

[0009] One embodiment of the present invention will be described in detail below with reference to the drawings. Figure 1 is a side view showing a green tire manufacturing line J incorporating the rubber strip manufacturing apparatus 1 of this embodiment, and Figure 2 is a cross-sectional view showing the main part of the rubber strip manufacturing apparatus 1 of Figure 1. As shown in Figures 1 and 2, the rubber strip manufacturing apparatus 1 of this embodiment is a manufacturing apparatus for forming rubber strips G2 using unvulcanized rubber G1.

[0010] A green tire manufacturing line J incorporating a rubber strip manufacturing apparatus 1 includes, for example, the rubber strip manufacturing apparatus 1, a rubber strip conveying apparatus 10, a rubber strip bonding apparatus 11, and a drum 12. In the green tire manufacturing line J, for example, rubber strips G2 formed by the rubber strip manufacturing apparatus 1 are conveyed by the rubber strip conveying apparatus 10, and the rubber strips are spirally wound onto the drum 12 using the rubber strip bonding apparatus 11. Such a green tire manufacturing line J can accurately form tire components and rubber products such as tread rubber and sidewall rubber.

[0011] The rubber strip manufacturing apparatus 1 of this embodiment includes an extruder 2 and a calender head 3 disposed adjacent to the downstream side of the extruder 2 in the extrusion direction. The extruder 2 includes, for example, an extruder body 5 having a screw 4 and an extrusion head 6 attached to the downstream end of the extruder body 5 in the extrusion direction. The extrusion head 6 of this embodiment includes a die plate 7 having a molding opening 7a for extruding rubber G1.

[0012] Figure 3 is a front view of the die plate 7 as seen from the extrusion direction. As shown in Figures 2 and 3, the molding port 7a of this embodiment has a predetermined opening width W and an opening height H that is smaller than the opening width W. Such a molding port 7a can continuously discharge pre-formed rubber G3, which is rubber G1 pre-formed into a strip shape.

[0013] Figure 4 is a conceptual diagram of the calender head 3 as viewed from the extrusion direction. As shown in Figures 2 and 4, the calender head 3 of this embodiment includes a first calender roll 8A positioned on one side of the preformed rubber G3 and a second calender roll 8B positioned on the other side in the direction of the opening height H of the molding port 7a.

[0014] The first calender roll 8A of this embodiment has a first molding surface 8a for forming the preformed rubber G3 into a rubber strip G2. The second calender roll 8B of this embodiment has a second molding surface 8b for forming the preformed rubber G3 into a rubber strip G2.

[0015] Preferably, at least one of the first molding surface 8a and the second molding surface 8b is provided with a groove 9 that extends continuously in the circumferential direction of the roll, located in the center in the direction of the opening width W of the molding port 7a. The depth D of the groove 9 is preferably greater than the opening height H of the molding port 7a. Such a groove 9 has a groove bottom surface 9a that does not come into contact with the pre-formed rubber G3.

[0016] As a result, in this embodiment, the calendar head 3 forms the rubber strip G2 by having at least one of the first molding surface 8a and the second molding surface 8b press only the edges Ge on both sides of the pre-formed rubber G3 in the direction of the opening width W of the molding port 7a.

[0017] Such a calender head 3 has a small contact area between the first molding surface 8a and the second molding surface 8b and the pre-formed rubber G3, which prevents the rubber strip G2 from sticking to the first calender roll 8A or the second calender roll 8B. Therefore, the rubber strip manufacturing apparatus 1 of this embodiment can stably form high-quality rubber strips G2.

[0018] In a more preferred embodiment, the groove 9 is provided on both the first molding surface 8a and the second molding surface 8b. In this case, it is sufficient that the sum of the depth D of the groove 9 provided on the first molding surface 8a and the depth D of the groove 9 provided on the second molding surface 8b is greater than the opening height H of the molding port 7a.

[0019] Thus, in this embodiment, both the first molding surface 8a and the second molding surface 8b press only the edge portion Ge of the preformed rubber G3 to form the rubber strip G2. Such a calender head 3 has a smaller contact area between the first molding surface 8a and the second molding surface 8b and the preformed rubber G3, and can more reliably suppress the rubber strip G2 from sticking to the first calender roll 8A or the second calender roll 8B.

[0020] At least one of the first molding surface 8a and the second molding surface 8b, and both in this embodiment, both sides of the concave groove 9 in the direction of the opening width W of the molding port 7a have tapered surfaces whose circumferential length becomes smaller toward the concave groove 9. That is, at least one of the first molding surface 8a and the second molding surface 8b, and both in this embodiment, the portion that contacts the edge portion Ge of the preformed rubber G3 has a tapered surface whose circumferential length becomes smaller toward the inside in the roll axis direction.

[0021] Although not shown, when the concave groove 9 and the tapered surface are provided on one of the first molding surface 8a and the second molding surface 8b, the other of the first molding surface 8a and the second molding surface 8b may be cylindrical or may be provided with only the tapered surface. Such a calender head 3 can select a roll according to the adhesion of the rubber strip G2 to be formed.

[0022] As shown in FIGS. 2 to 4, the opening height H of the molding port 7a is preferably 0.5 to 3.0 mm. Also, the opening width W of the molding port 7a is preferably 10.0 to 30.0 mm. Such a molding port 7a can make the cross-sectional shape of the preformed rubber G3 closer to the cross-sectional shape of the rubber strip G2, which helps to improve the quality of the rubber strip G2.

[0023] The total depth D of the grooves 9 is preferably 400% to 800% of the opening height H of the molding port 7a. Having the total depth D of the grooves 9 at 400% or more of the opening height H of the molding port 7a reliably prevents the groove bottom surface 9a from contacting the pre-formed rubber G3. Having the total depth D of the grooves 9 at 800% or less of the opening height H of the molding port 7a helps to prevent the shaft diameter formed by the groove bottom surface 9a from becoming excessively small, thereby improving durability.

[0024] The width Wg of the groove 9 is preferably 30% to 90% of the opening width W of the molding port 7a. When the width Wg of the groove 9 is 30% or more of the opening width W of the molding port 7a, the contact area between the first molding surface 8a and the second molding surface 8b and the pre-formed rubber G3 can be reduced, and adhesion of the rubber strip G2 can be reliably suppressed. When the width Wg of the groove 9 is 90% or less of the opening width W of the molding port 7a, the shape of the edge portion Ge of the pre-formed rubber G3 can be molded with high precision, and the quality of the rubber strip G2 can be improved.

[0025] As shown in Figure 1, the rubber strip conveying device 10 includes, for example, a belt conveyor 13 that conveys rubber strips G2 formed in the rubber strip manufacturing device 1. It is desirable that the rubber strip conveying device 10 receives the rubber strips at a receiving position P1 on the upstream side in the conveying direction and conveys them to a handover position P2 on the downstream side in the conveying direction.

[0026] The belt conveyor 13 has, for example, a conveyor belt 15 that is wound around a plurality of guide rollers 14 so as to be able to rotate. Such a rubber strip conveying device 10 can convey the rubber strip G2, which has been formed in the rubber strip manufacturing device 1, from the receiving position P1 to the handover position P2 by adhesively holding the surface of the conveyor belt 15 to the surface of the conveyor belt 15.

[0027] The rubber strip conveying device 10 includes a first electric motor M1 that drives the conveying belt 15 in synchronization with the rubber strip manufacturing device 1, and a second electric motor M2 that drives the drum 12 in synchronization with the drum 12. Preferably, the belt conveyor 13 includes a storage section 16 for temporarily storing the rubber strips G2 while conveying them. Such a belt conveyor 13 can smoothly convey the rubber strips G2 even when the first electric motor M1 and the second electric motor M2 are not synchronized.

[0028] The storage section 16 is formed, for example, from a forward storage section 16A on which the conveyor belt 15 travels from the receiving position P1 to the handover position P2, and a return storage section 16B on which the conveyor belt travels from the handover position P2 to the receiving position P1.

[0029] The forward storage section 16A includes, for example, an upper guide roller 14 arranged on an upper fixed frame 17A and a lower guide roller 14 arranged on a lower lifting frame 17B. The return storage section 16B includes, for example, an upper guide roller 14 arranged on an upper fixed frame 17A and a lower guide roller 14 arranged on a lower lifting frame 17B.

[0030] It is preferable that the conveyor belt 15 is wound in a zigzag pattern, folding back and forth, between the upper guide roller 14 and the lower guide roller 14. In such a storage section 16, the amount of conveyor belt 15 stored can be adjusted by changing the distance between the upper guide roller 14 and the lower guide roller 14 by raising and lowering the lifting frame 17B.

[0031] In this type of rubber strip conveying device 10, while the drum 12 is stopped, the conveyor belt 15 of the return route storage section 16B can be removed by the drive of the first electric motor M1, the rubber strip G2 can be attached to it, and then stored in the forward route storage section 16A.

[0032] The conveyor belt 15 with rubber strips stored in the forward storage section 16A is removed by the drive of the second electric motor M2 while the drum 12 is in operation. Such a rubber strip conveying device 10 can smoothly supply the rubber strips G2 to the rubber strip application device 11 and the drum 12.

[0033] Although particularly preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the embodiments described above and can be implemented in various modified forms.

[0034] [Note] The present invention is as follows:

[0035] [Invention 1] A rubber strip manufacturing apparatus for forming rubber strips using unvulcanized rubber, comprising an extruder and a calender head disposed adjacent to the downstream side of the extruder in the extrusion direction, wherein the extruder includes a die plate having a molding port for extruding the rubber, the molding port having a predetermined opening width and an opening height smaller than the opening width, thereby continuously discharging the rubber as preformed rubber in the form of a strip, the calender head includes a first calender roll disposed on one side of the preformed rubber and a second calender roll disposed on the other side in the direction of the opening height of the molding port, the first calender roll has a first molding surface for forming the preformed rubber into a rubber strip, and the second calender roll has a second molding surface for forming the preformed rubber into a rubber strip, and at least one of the first molding surface and the second molding surface presses only the edges on both sides of the preformed rubber in the direction of the opening width of the molding port to form the rubber strip.

[0036] [2nd Invention] The rubber strip manufacturing apparatus according to the present invention 1, wherein both the first molding surface and the second molding surface press only the edge portion of the preformed rubber to form the rubber strip.

[0037] [Invention 3] The rubber strip manufacturing apparatus according to the present invention 1 or 2, wherein at least one of the first molding surface and the second molding surface has a tapered surface in which the portion that contacts the edge portion of the preformed rubber has a circumference that decreases toward the inside in the direction of the roll axis.

[0038] [4th Invention] A rubber strip manufacturing apparatus for forming rubber strips using unvulcanized rubber, comprising an extruder and a calender head disposed adjacent to the downstream side of the extruder in the extrusion direction, wherein the extruder includes a die plate having a molding port for extruding the rubber, the molding port having a predetermined opening width and an opening height smaller than the opening width, thereby continuously discharging the rubber as preformed rubber in the form of a strip, the calender head includes a first calender roll disposed on one side of the preformed rubber in the direction of the opening height of the molding port and a second calender roll disposed on the other side, the first calender roll having a first molding surface for forming the preformed rubber into a rubber strip, the second calender roll having a second molding surface for forming the preformed rubber into a rubber strip, and at least one of the first molding surface and the second molding surface is provided with a groove extending continuously in the circumferential direction of the roll at the center in the direction of the opening width of the molding port, the groove having a groove bottom surface that does not contact the preformed rubber.

[0039] [5th ​​Invention] A rubber strip manufacturing apparatus for forming rubber strips using unvulcanized rubber, comprising an extruder and a calender head disposed adjacent to the extruder in the extrusion direction, wherein the extruder includes a die plate having a molding port for extruding the rubber, the molding port having a predetermined opening width and an opening height smaller than the opening width, thereby continuously discharging the rubber as preformed rubber in the form of a strip, the calender head includes a first calender roll disposed on one side of the preformed rubber and a second calender roll disposed on the other side in the direction of the opening height of the molding port, the first calender roll having a first molding surface for forming the preformed rubber into a rubber strip, the second calender roll having a second molding surface for forming the preformed rubber into a rubber strip, and at least one of the first molding surface and the second molding surface is provided with a groove extending continuously in the circumferential direction of the roll in the central part in the direction of the opening width of the molding port, the depth of the groove being greater than the opening height of the molding port.

[0040] [Invention 6] The rubber strip manufacturing apparatus according to claim 4 or 5 of the present invention, wherein the grooves are provided on both the first molding surface and the second molding surface.

[0041] [7th Invention] A rubber strip manufacturing apparatus according to any one of the present invention 4 to 6, wherein at least one of the first molding surface and the second molding surface has tapered surfaces on both sides of the groove in the direction of the opening width of the molding port, with the circumference decreasing toward the groove.

[0042] [8th Invention] A rubber strip manufacturing apparatus according to any one of invention 1 to 7, wherein the opening height of the molding port is 0.5 to 3.0 mm, and the opening width of the molding port is 10.0 to 30.0 mm. [Explanation of Symbols]

[0043] 1. Rubber strip manufacturing apparatus 2 Extruder 3 Calendar Head 7 Die Plates 7a Molding mouth 8A First calendar roll 8a 1st molding surface 8B Second Calendar Roll 8b 2nd molding surface

Claims

1. A rubber strip manufacturing apparatus for forming rubber strips using unvulcanized rubber, The system includes an extruder and a calender head disposed adjacent to the extruder downstream in the extrusion direction, The extruder includes a die plate having a molding opening for extruding the rubber, The molding port has a predetermined opening width and an opening height smaller than the opening width, thereby continuously dispensing the rubber as pre-formed rubber in a strip shape. The calender head includes a first calender roll positioned on one side of the preformed rubber and a second calender roll positioned on the other side in the direction of the opening height of the molding port. The first calender roll has a first molding surface for forming the preformed rubber into the rubber strip, The second calender roll has a second molding surface for forming the preformed rubber into the rubber strip, At least one of the first molding surface and the second molding surface presses only the edges on both sides of the preformed rubber in the direction of the opening width of the molding port to form the rubber strip. Rubber strip manufacturing equipment.

2. The rubber strip manufacturing apparatus according to claim 1, wherein both the first molding surface and the second molding surface press only the edge portion of the preformed rubber to form the rubber strip.

3. The rubber strip manufacturing apparatus according to claim 1, wherein at least one of the first molding surface and the second molding surface has a tapered surface in which the portion that contacts the edge portion of the preformed rubber has a circumference that decreases toward the inside in the direction of the roll axis.

4. A rubber strip manufacturing apparatus for forming rubber strips using unvulcanized rubber, The system includes an extruder and a calender head disposed adjacent to the extruder downstream in the extrusion direction, The extruder includes a die plate having a molding opening for extruding the rubber, The molding port has a predetermined opening width and an opening height smaller than the opening width, thereby continuously dispensing the rubber as pre-formed rubber in a strip shape. The calender head includes a first calender roll positioned on one side of the preformed rubber and a second calender roll positioned on the other side in the direction of the opening height of the molding port. The first calender roll has a first molding surface for forming the preformed rubber into the rubber strip, The second calender roll has a second molding surface for forming the preformed rubber into the rubber strip, At least one of the first molding surface and the second molding surface is provided with a groove that extends continuously in the circumferential direction of the roll, located in the center of the molding opening in the direction of the opening width of the molding port. The groove has a groove bottom surface that does not come into contact with the pre-formed rubber. Rubber strip manufacturing equipment.

5. A rubber strip manufacturing apparatus for forming rubber strips using unvulcanized rubber, The system includes an extruder and a calender head disposed adjacent to the extruder downstream in the extrusion direction, The extruder includes a die plate having a molding opening for extruding the rubber, The molding port has a predetermined opening width and an opening height smaller than the opening width, thereby continuously dispensing the rubber as pre-formed rubber in a strip shape. The calender head includes a first calender roll positioned on one side of the preformed rubber and a second calender roll positioned on the other side in the direction of the opening height of the molding port. The first calender roll has a first molding surface for forming the preformed rubber into the rubber strip, The second calender roll has a second molding surface for forming the preformed rubber into the rubber strip, At least one of the first molding surface and the second molding surface is provided with a groove extending continuously in the circumferential direction of the roll at the center of the molding opening in the direction of the opening width of the molding opening. The depth of the groove is greater than the opening height of the molding port. Rubber strip manufacturing equipment.

6. The rubber strip manufacturing apparatus according to claim 4 or 5, wherein the grooves are provided on both the first molding surface and the second molding surface.

7. The rubber strip manufacturing apparatus according to claim 4 or 5, wherein at least one of the first molding surface and the second molding surface has tapered surfaces on both sides of the groove in the direction of the opening width of the molding port, with the circumference decreasing toward the groove.

8. The opening height of the molding port is 0.5 to 3.0 mm. The rubber strip manufacturing apparatus according to any one of claims 1 to 5, wherein the opening width of the molding port is 10.0 to 30.0 mm.

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