CN113085238A - Method for manufacturing green tire - Google Patents
Method for manufacturing green tire Download PDFInfo
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- CN113085238A CN113085238A CN202011354230.XA CN202011354230A CN113085238A CN 113085238 A CN113085238 A CN 113085238A CN 202011354230 A CN202011354230 A CN 202011354230A CN 113085238 A CN113085238 A CN 113085238A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title abstract description 22
- 238000005304 joining Methods 0.000 claims abstract description 78
- 238000004804 winding Methods 0.000 claims abstract description 25
- 238000005096 rolling process Methods 0.000 claims abstract description 11
- 229920001971 elastomer Polymers 0.000 claims description 66
- 238000003825 pressing Methods 0.000 claims description 33
- 239000000463 material Substances 0.000 claims description 8
- 239000004744 fabric Substances 0.000 claims 1
- 239000011324 bead Substances 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000000465 moulding Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229920005549 butyl rubber Polymers 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/38—Textile inserts, e.g. cord or canvas layers, for tyres; Treatment of inserts prior to building the tyre
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- Tyre Moulding (AREA)
Abstract
A method for manufacturing a green tire. A green tire is manufactured with high accuracy. A method for manufacturing a green tire (1a) includes a bonding step (S2). The green tire includes a second cylindrical body (32A) having a pair of non-contact regions (36, 36). The second cylindrical body has an overlapping portion (33) where a winding start end portion (32a) and a winding end portion (32b) overlap. The bonding step includes: a first non-contact region joining step (N3) in which the first roller (11) is pressed by rolling from the inner end (38i) side to the outer end (38e) side in the drum axis direction of one non-contact region (36A) at the overlapping section; and a second noncontact region bonding step (N4) in which the second roller (12) is pressed by rolling over the overlap portion from the inner end (39i) side to the outer end side in the drum axis direction of the other noncontact region (36B). The first non-contact region bonding step and the second non-contact region bonding step are performed at the same timing.
Description
Technical Field
The present invention relates to a method for manufacturing a green tire.
Background
Patent document 1 describes a method of manufacturing a tire in which a sheet-like inner liner rubber and a sheet-like carcass ply having a width wider than that of the inner liner rubber are sequentially wound around a building drum. Both sides of the carcass ply in the width direction protrude from the inner liner rubber.
Patent document 1: japanese patent No. 5281671
Patent document 2: international publication No. 2007/007405
Disclosure of Invention
On the other hand, it is preferable that the carcass ply has an overlapping portion where a start end portion and a terminal end portion of winding overlap, and the start end portion and the terminal end portion of the overlapping portion are securely joined by pressing.
As a method for joining the overlapped portions, it is conceivable to apply the method for producing a carcass ply material described in patent document 2. In the manufacturing method of patent document 2, two sets of roller units are used, and one roller unit is moved from the center side of the joint portion of the carcass ply to one side, and the other roller unit is moved from the center side of the joint portion of the carcass ply to the other side. At this time, the other roller unit starts moving later than the one roller unit.
Here, since the portion of the carcass ply protruding from the inner liner rubber is in direct contact with the building drum, the adhesion force with the building drum is small. Therefore, if the manufacturing method of the above-mentioned patent document 2 is applied to the joining of the carcass ply, the force toward the widthwise outer side generated by the roller units acts on the projecting portions on both sides with a time difference, and a problem occurs in that the carcass ply is displaced in the widthwise direction thereof.
The present invention has been made in view of the above circumstances, and an object thereof is to provide a method for manufacturing a green tire, which can manufacture a green tire with high accuracy.
The present invention is a method for manufacturing a green tire, comprising: a step of winding a second rubber sheet having a width wider than that of the first rubber sheet around the outside of a first cylindrical body of the first rubber sheet formed on a drum to form a second cylindrical body having an overlapping portion where a winding start end portion and a winding end portion overlap; and a joining step of pressing the terminal end portion toward the starting end portion to join the overlapping portion, wherein the second cylindrical body includes a contact region that contacts the first cylindrical body and a pair of noncontact regions that project from the first cylindrical body toward both outer sides in a drum axis direction, the joining step includes: a first non-contact region joining step of rolling the first roller from an inner end side to an outer end side in a drum axis direction of one of the non-contact regions on the overlapping portion to press the first roller; and a second non-contact area joining step of rolling and pressing a second roller from an inner end side to an outer end side in a drum axis direction of the other non-contact area on the overlapping portion, wherein the first non-contact area joining step and the second non-contact area joining step are performed at the same timing.
In the method for manufacturing a green tire according to the present invention, it is preferable that the joining step includes: a first contact region joining step of rolling the first roller from a center side in a drum axis direction of the contact region to the inner end of the one non-contact region on the overlapping portion to press the first roller; and a second contact region joining step of rolling the second roller from a center side in a drum axis direction of the contact region to the inner end of the other non-contact region on the overlapping portion and pressing the second roller, wherein the second contact region joining step is started later than the first contact region joining step.
In the method for manufacturing a green tire according to the present invention, it is preferable that the first non-contact region bonding step is performed subsequent to the first contact region bonding step, and the second non-contact region bonding step is performed subsequent to the second contact region bonding step.
In the method of manufacturing a green tire according to the present invention, it is preferable that the pressing force of the first roller in the first non-contact region joining step is larger than the pressing force of the first roller in the first contact region joining step.
In the method for manufacturing a green tire according to the present invention, it is preferable that the pressing force of the second roller in the second non-contact region joining step is larger than the pressing force of the second roller in the second contact region joining step.
In the method for manufacturing a green tire according to the present invention, it is preferable that the moving speed of the second roller in the second contact region joining step is higher than the moving speed of the first roller in the first contact region joining step.
In the method for manufacturing a green tire according to the present invention, it is preferable that the pressing force of the first roller in the first contact region joining step and the pressing force of the second roller in the second contact region joining step be 0.10MPa to 0.15 MPa.
In the method for manufacturing a green tire according to the present invention, it is preferable that the moving speed of the first roller in the first non-contact region joining step is the same as the moving speed of the second roller in the second non-contact region joining step.
In the method for manufacturing a green tire according to the present invention, it is preferable that the pressing force of the first roller in the first non-contact region bonding step and the pressing force of the second roller in the second non-contact region bonding step be 0.20MPa to 0.25 MPa.
In the method for producing a green tire according to the present invention, it is preferable that the first rubber sheet is a rubber material of unvulcanized rubber, and the second rubber sheet is a ply material in which cords arranged in parallel are covered with unvulcanized rubber.
In the method of manufacturing a green tire according to the present invention, it is preferable that the first rubber sheet is an inner liner layer and the second rubber sheet is a carcass ply.
In the method of manufacturing a green tire of the present invention, the first non-contact region bonding step and the second non-contact region bonding step are performed at the same timing. Thus, since the one non-contact region and the other non-contact region have opposite forces acting in the drum axial direction at the same timing, the positional displacement of the second rubber piece in the drum axial direction is suppressed. Therefore, the method for manufacturing a green tire of the present invention can manufacture a green tire with high accuracy.
Drawings
Fig. 1 is a cross-sectional view showing one embodiment of a tire manufactured by the method for manufacturing a green tire of the present invention.
Fig. 2 is a perspective view showing one embodiment of an apparatus used in the method for manufacturing a green tire of the present invention.
Fig. 3 is a plan view of the drum around which the rubber sheet is wound.
Fig. 4 (a) and (b) are cross-sectional views for explaining the method of manufacturing a green tire of the present invention.
Fig. 5 (a) and (b) are cross-sectional views for explaining the method of manufacturing a green tire of the present invention.
Description of the reference symbols
1 a: a green tire; 38i, 39 i: an inner end; 38e, 39 e: an outer end; 11: a first roller; 12: a second roller; s2: a bonding step; n3: a first non-contact area bonding step; n4: a second non-contact area bonding step; 36A: a non-contact region on one side; 36B: a non-contact region of the other side; 32A: a second cylindrical body; 32 a: a starting end portion; 32 b: a terminal end portion; 33: an overlapping portion.
Detailed Description
An embodiment of the present invention will be described below with reference to the drawings.
Fig. 1 is a radial cross-sectional view of a tire 1 manufactured by the method for manufacturing a green tire according to the present embodiment (hereinafter, may be simply referred to as "manufacturing method"). Fig. 1 shows a pneumatic tire for a passenger vehicle. The present invention can be applied to a method for manufacturing a green tire for a pneumatic tire for a motorcycle, a heavy load, or the like, in addition to a passenger vehicle.
As shown in fig. 1, a tire 1 of the present embodiment includes: a carcass 6 extending between the bead portions 4, 4 on both sides; a belt layer 7 disposed on the tread portion 2 on the outer side of the carcass 6 in the tire radial direction; and an inner liner 8 disposed inside the carcass 6.
The carcass 6 of the present embodiment is formed of a single carcass ply 6A in which carcass cords (not shown) are arranged at an angle of 70 ° to 90 ° with respect to the tire circumferential direction. In the present embodiment, the carcass ply 6A includes a main body portion 6A and a pair of turn-up portions 6 b. The main body 6a extends, for example, across between the bead cores 5, 5 embedded in the bead portions 4 on both sides. The folded portion 6b is folded back from the inner side to the outer side in the tire axial direction around the bead core 5, for example, in connection with the main body portion 6 a. The folded portion 6b of the present embodiment has an outer end 6e sandwiched between the belt layer 7 and the main body portion 6 a. In this way, the tire 1 of the present embodiment is formed in a so-called High turn up (High turn up) structure having a turn-up portion 6b having a large length in the tire radial direction.
The belt layer 7 of the present embodiment is formed of 2 belt plies 7A and 7B arranged inside and outside in the tire radial direction. Each of the belt plies 7A, 7B has, for example, steel cords arranged at an angle of 45 ° to 75 ° with respect to the tire circumferential direction. The outer end 7e of the inner belt ply 7A in the tire axial direction is located outward in the tire axial direction from the tread end Te and the outer end 6e of the folded portion 6 b.
The "tread end Te" is determined as a ground contact position at the outermost side in the tire axial direction when a standard load is applied to the tire 1 in a standard state and ground is contacted with a plane at a camber angle of 0 degree.
The "standard state" is an unloaded state in which the tire 1 is mounted on a standard rim (not shown) and filled with a standard internal pressure.
The "standard Rim" refers to a Rim determined for each tire in a specification system including the specification under which the tire 1 is based, and is, for example, "standard Rim" in case of JATMA, "Design Rim" in case of TRA, or "Measuring Rim" in case of ETRTO.
The "standard internal PRESSURE" refers to the air PRESSURE determined for each TIRE in a specification system including the specification under which the TIRE 1 is based, and is "maximum air PRESSURE" in case of JATMA, the maximum value described in the table "TIRE LOAD limitant variant INFLATION PRESSURE" in case of TRA, and "INFLATION PRESSURE" in case of ETRTO.
The "standard LOAD" is a LOAD specified for each TIRE in a specification system including the specification under which the TIRE 1 is based, and is "maximum LOAD CAPACITY" in case of JATMA, maximum value described in table "tie LOAD AT variatus color stability requirements" in case of TRA, and "LOAD CAPACITY" in case of ETRTO.
The inner liner 8 of the present embodiment is formed of butyl rubber having excellent air impermeability. The inner liner 8 is in contact with the main body 6A of the carcass ply 6A, for example, and extends between the bead cores 5 and 5 on both sides.
Fig. 2 is a perspective view of an embodiment of an apparatus T used in the manufacturing method of the present embodiment. As shown in fig. 2, a known apparatus is used as the apparatus T of the present embodiment. The device T comprises, for example, a drum 10, a first roller 11 and a second roller 12. In the present embodiment, the apparatus T further includes a server 13 and a delivery unit 14.
The drum 10 of the present embodiment has a cylindrical winding surface 10 s. The winding surface 10s of the drum 10 is formed of, for example, a plurality of split dies 16 supported on the rotation shaft 10r of the drum 10. Each split mold 16 is supported by the rotary shaft 10r so as to be movable in the radial direction of the drum 10 (drum radial direction), for example. Thus, the winding surface 10s of the present embodiment can be expanded and reduced in diameter in the drum diameter direction.
The rotary shaft 10r of the drum 10 is coupled to a driving unit (not shown) such as a motor provided in the conveying unit 14. Thereby, the winding surface 10s of the drum 10 can be rotated via the rotation shaft 10 r. The longitudinal direction of the rotary shaft 10r is the axial direction (drum axis direction) X of the drum 10. The rotary shaft 10r of the drum 10 of the present embodiment is horizontally disposed.
The first roller 11 and the second roller 12 of the present embodiment are used to press the rubber sheet 30 toward the winding surface 10 s. The first roller 11 and the second roller 12 include a support shaft 17 and a roller piece 18, respectively. The roller piece 18 is made of, for example, a flexible resin material, and is rotatably supported by the support shaft 17. The width w (shown in FIG. 3) of the roll sheet 18 is preferably 5mm to 10mm, for example.
The support shaft 17 of the present embodiment is supported by a known moving tool (not shown) including a known rod cylinder mechanism, a rack and pinion mechanism, and the like (not shown), for example. Thus, the first roller 11 and the second roller 12 of the present embodiment can move in, for example, the drum axis direction X or the vertical direction (vertical direction) Y.
The server 13 of the present embodiment is used to supply the rubber sheet 30 to the winding surface 10s of the rotating drum 10. The green tire 1a as a tire component is formed by winding the rubber sheet 30 on the winding surface 10s of the drum 10.
Fig. 3 is a plan view of the drum 10 and the rubber sheet 30 wound around the drum 10. As shown in fig. 3, the rubber sheet 30 of the present embodiment includes a first rubber sheet 31 and a second rubber sheet 32 having a width larger than that of the first rubber sheet 31. The second rubber sheet 32 is wound around the outside of the first rubber sheet 31.
In the present embodiment, the length of the second rubber sheet 32 in the longitudinal direction (the conveying direction of the servers 13) is greater than the length of the winding surface 10s of the drum 10 in the drum circumferential direction. Thereby, when the second rubber sheet 32 is wound on the drum 10, an overlapping portion 33 is formed in which the winding start end portion 32a and the winding end portion 32b of the second rubber sheet 32 overlap. In the present embodiment, the overlapping portion 33 is formed over the entire width-directional region of the second rubber sheet 32. The first rubber sheet 31 is preferably longer in the longitudinal direction than the circumferential direction of the winding surface 10s of the drum 10, for example.
The first rubber sheet 31 is, for example, an unvulcanized rubber material. In the present embodiment, the first rubber sheet 31 is used as the inner liner 8. The second rubber sheet 32 is, for example, a ply material in which cords arranged in parallel are covered with unvulcanized rubber. In the present embodiment, the second rubber sheet 32 is used for the carcass ply 6A.
As shown in fig. 2, the conveying unit 14 is used to carry the drum 10 into the server 13 and carry the drum 10 out of the server 13. The transport unit 14 can move, for example, along a rail 19 or the like provided on the floor.
Next, the manufacturing method of the present embodiment will be described. The manufacturing method of the present embodiment includes a forming step S1 and a bonding step S2. In the forming step S1, the second cylindrical body 32A is formed outside the first cylindrical body 31A formed on the drum 10.
Fig. 4 (a) is a cross-sectional view of the drum 10 for explaining the forming step S1. As shown in fig. 4 (a), in the present embodiment, the first cylindrical body 31A is formed by winding the first rubber sheet 31 around the winding surface 10s of the drum 10. The first rubber sheet 31 is wound on the winding surface 10s by being conveyed to the rotating drum 10 by the server 13, for example. The winding end (not shown) is joined to the first rubber sheet 31 by, for example, the first roller 11 or the second roller 12.
In the forming step S1 of the present embodiment, the second rubber sheet 32 is subsequently conveyed to the rotating drum 10 by the server 13, for example, and wound around the winding surface 10S and the first cylindrical body 31A, thereby forming the second cylindrical body 32A. At this time, the start end portion 32a and the end portion 32b overlap in the drum radial direction. The overlapping portion 33 is preferably disposed so as to be located uppermost in the vertical direction, for example. The length L1 (shown in fig. 2) of the overlapping portion 33 in the drum circumferential direction is preferably smaller than the width w of the roll sheet 18, and is, for example, about 3mm to 6 mm. At this time, the first roller 11 and the second roller 12 are restricted to a position apart from the drum 10.
The second cylindrical body 32A is formed including a contact region 35 that contacts the first cylindrical body 31A and a pair of noncontact regions 36 and 36 that extend from the first cylindrical body 31A to both sides in the drum axis direction X. The non-contact regions 36, 36 are formed so that the lengths L2 in the drum axis direction X are the same. In the present specification, one non-contact region (left side in the drawing) is the first non-contact region 36A, and the other non-contact region (right side in the drawing) is the second non-contact region 36B.
Next, a bonding step S2 is performed. The bonding process S2 of the present embodiment includes a first contact region bonding step N1, a second contact region bonding step N2, a first non-contact region bonding step N3, and a second non-contact region bonding step N4.
Fig. 4 (b) is a sectional view of the drum 10 for explaining the first contact region joining step N1. As shown in fig. 4 (b), the first contact region joining step N1 of the present embodiment is a step of rolling the first roller 11 on the overlap portion 33 from the center side of the contact region 35 in the drum axis direction X to the inner end 38i of the first non-contact region 36A and pressing it. In the first contact region joining step N1, for example, the moving means, not shown, is operated, and the first roller 11 is brought into contact with the center of the contact region 35 of the overlapping portion 33 in the drum axis direction X, and the second rubber sheet 32 is pressed against the drum 10. Next, for example, the moving means is operated, and the first roller 11 is moved while being pressed toward the first noncontact region 36A along the drum axis direction X. In the first contact region joining step N1, the moving speed (drum axis direction X) of the first roller 11 is set to v 1. When the first rubber sheet 31 is the carcass ply 6A, the pressing force p1 of the first roller 11 is preferably 0.10 to 0.15 MPa. At this time, the second roller 12 is restricted to a position away from the drum 10 in order to avoid contact with the first roller 11.
Next, a second contact region bonding step N2 is performed. Fig. 5 (a) is a sectional view of the drum 10 for explaining the second contact region joining step N2. As shown in fig. 5 (a), the second contact region joining step N2 rolls the second roller 12 from the center side in the drum axis direction X of the contact region 35 to the inner end 39i of the second non-contact region 36B on the superimposed portion 33, and presses it. In the second contact region joining step N2, for example, the moving means, not shown, is operated, and the second roller 12 is brought into contact with the center of the contact region 35 of the overlapping portion 33 in the drum axis direction X, thereby pressing the second rubber sheet 32 against the drum 10. In this case, the second roller 12 is preferably pressed at the same position as the position where the first roller 11 first presses the second rubber sheet 32. Next, for example, the moving means is operated to move the second roller 12 along the drum axis direction X toward the second non-contact region 36B while pressing it. The second contact region joining step N2 starts, for example, during the movement of the first roller 11 in the contact region 35.
In this way, the second contact region joining step N2 is started, for example, later than the first contact region joining step N1. This is to prevent the first roller 11 from contacting the second roller 12 and to position the first pressing position to the second rubber sheet 32 at the same position, thereby firmly joining the second rubber sheet 32.
In the second contact region joining step N2, the moving speed v2 (drum axis direction X) of the second roller 12 is set to be faster than the moving speed v1 of the first roller 11. The pressing force p2 of the second roller 12 is preferably set to 0.10MPa to 0.15MPa, for example, in the same manner as the pressing force p1 of the first roller 11.
Next, the first non-contact region bonding step N3 and the second non-contact region bonding step N4 are started. Fig. 5 (b) is a sectional view of the drum 10 for explaining the first non-contact region joining step N3 and the second non-contact region joining step N4. As shown in fig. 5 (b), the first non-contact region joining step N3 rolls the first roller 11 from the inner end 38i side to the outer end 38e side in the drum axis direction X of the first non-contact region 36A on the overlap portion 33, and presses it. The second non-contact region joining step N4 rolls the second roller 12 from the inner end 39i side to the outer end 39e side in the drum axis direction X of the second non-contact region 36B on the superimposed portion 33, and presses it.
The first non-contact region bonding step N3 and the second non-contact region bonding step N4 are performed at the same timing. Accordingly, the first non-contact region 36A and the second non-contact region 36B are applied with opposite forces in the drum axis direction X at the same timing, and therefore, the positional displacement of the second rubber blade 32 in the drum axis direction X can be suppressed. Therefore, the manufacturing method of the present embodiment can manufacture the green tire 1a with high accuracy. The "same timing" means that the timing at which the first roller 11 passes the inner end 38i of the first noncontact region 36A is the same as the timing at which the second roller 12 passes the inner end 39i of the second noncontact region 36B. The "same timing" includes a deviation of the time to such an extent that the effect of suppressing the positional deviation of the second rubber piece 32 in the drum axis direction X can be exerted, and includes a case where the deviation of the time is within 2sec, for example.
In order to perform the first non-contact region joining step N3 and the second non-contact region joining step N4 at the same timing, the moving speed v2 of the second roller 12 in the second contact region joining step N2 is made faster than the moving speed v1 of the first roller 11 in the first contact region joining step N1. The length L3 in the drum axis direction of the contact region 35 (the width of the first rubber sheet 31) is used as a basis, but for example, the moving speed v2 of the second roller 12 is preferably 30mm/sec to 50mm/sec faster than the moving speed v1 of the first roller 11.
Preferably, the moving speed V1 of the first roller 11 in the first non-contact region joining step N3 is the same as the moving speed V2 of the second roller 12 in the second non-contact region joining step N4. Accordingly, the timings of the first roller 11 and the second roller 12 passing through the outer ends 38e and 39e are also the same, and the first roller 11 and the second roller 12 act with forces in opposite directions in the drum axis direction X over the entire first noncontacting region 36A and the second noncontacting region 36B. This further suppresses the positional displacement of the second rubber sheet 32 in the drum axis direction X.
Although not particularly limited, it is preferable that the moving speed V2 of the second roller 12 in the second non-contact region joining step N4 is the same as the moving speed V2 of the second roller 12 in the second contact region joining step N2. In this case, the moving speed V1 of the first roller 11 in the first non-contact region joining step N3 is faster than the moving speed V1 of the first roller 11 in the first contact region joining step N1.
The length L3 of the contact region 35 in the drum axis direction is used as a basis for determining the moving speed v1 of the first roller 11, for example, preferably 140mm/sec to 200 mm/sec. Further, the moving speed V1 of the first roller 11, the moving speed V2 of the second roller 12, and the moving speed V2 of the second roller 12 are preferably 190mm/sec to 250 mm/sec.
The moving speeds V1, V2, V1, and V2 in the steps N1 to N4 are not limited to the above-described embodiments. Since the first non-contact region bonding step N3 and the second non-contact region bonding step N4 are performed at the same timing. Also, the moving speed V1 of the first roller 11 in the first non-contact region joining step N3 is the same as the moving speed V2 of the second roller 12 in the second non-contact region joining step N4. Other moving speeds may be selected, respectively, as long as these specifications are satisfied.
In order to effectively exert the above-described action, it is preferable that the pressing force P1 of the first roller 11 in the first non-contact region joining step N3 and the pressing force P2 of the second roller 12 in the second non-contact region joining step N4 be the same. In the case where the second rubber sheet 32 is the carcass ply 6A, the pressing force P1 of the first roller 11 in the first non-contact region joining step N3 and the pressing force P2 of the second roller 12 in the second non-contact region joining step N4 are preferably 0.20MPa to 0.25 MPa.
In the bonding step S2 of the present embodiment, the first non-contact region bonding step N3 is performed after the first contact region bonding step N1. In addition, the second non-contact region bonding step N4 is performed after the second contact region bonding step N2. That is, the joining process S2 is performed without stopping the first roller 11, for example, from the first contact region joining step N1 to the first non-contact region joining step N3. The bonding step S2 is performed, for example, from the second contact region bonding step N2 to the second non-contact region bonding step N4 without stopping the second roller 12.
In the present embodiment, the second contact region joining step N2 is started later than the first contact region joining step N1. Then, a first non-contact region bonding step N3 is performed following the first contact region bonding step N1, and a second non-contact region bonding step N4 is performed following the second contact region bonding step N2. However, the present invention is not limited to such an embodiment. For example, the first non-contact region bonding step N3 and the second non-contact region bonding step N4 may be started at the same timing and then started in the order of the first contact region bonding step N1 and the second contact region bonding step N2. In this case, it is preferable that the moving speed V1 of the first roller 11 of the first non-contact region joining step N3 is the same as the moving speed V2 of the second roller 12 of the second non-contact region joining step N4. In addition, the moving speed v1 of the first roller 11 in the first contact region joining step N1 and the moving speed v2 of the second roller 12 in the second contact region joining step N2 may be the same.
While the above description has been made in detail with respect to the particularly preferred embodiments of the present invention, the present invention is not limited to the illustrated embodiments, and can be modified into various embodiments.
[ examples ] A method for producing a compound
Using the apparatus of fig. 2, a green tire was manufactured in which a second cylindrical body made of a second rubber sheet (carcass ply) was formed outside a first cylindrical body made of a first rubber sheet (inner liner). Further, the molding accuracy of the second cylindrical body of the green tire was tested. The test methods and general specifications are as follows.
Length of each non-contact region in the drum axis direction: 140mm
< precision of Molding >
The tester measures the amount of positional displacement of the second rubber sheet relative to the first rubber sheet in the drum axis direction. The results were found to be good when the thickness was less than 5 mm. The results are shown in Table 1.
In an embodiment, the first non-contact region bonding step and the second non-contact region bonding step start at the same timing. In the comparative example, the first non-contact region bonding step and the second non-contact region bonding step are started at different timings.
[ TABLE 1 ]
It was confirmed that the production method of the example was superior in molding accuracy to the production method of the comparative example.
Claims (11)
1. A method of manufacturing a green tire, comprising:
a step of winding a second rubber sheet having a width wider than that of the first rubber sheet around the outside of a first cylindrical body of the first rubber sheet formed on a drum to form a second cylindrical body having an overlapping portion in which a leading end portion and a trailing end portion of the winding overlap; and
a joining step of pressing the terminal end portion toward the starting end portion to join the overlapped portions,
the second cylindrical body includes a contact region that contacts the first cylindrical body and a pair of non-contact regions that extend from the first cylindrical body to both outer sides in a drum axis direction,
the bonding step includes:
a first non-contact region joining step of rolling the first roller from an inner end side to an outer end side in a drum axis direction of one of the non-contact regions on the overlapping portion to press the first roller; and
a second non-contact region joining step of rolling the second roller from an inner end side to an outer end side in a drum axis direction of the other non-contact region on the overlapping portion to press the second roller,
the first non-contact region bonding step and the second non-contact region bonding step are performed at the same timing.
2. The method of manufacturing a green tire according to claim 1,
the bonding step includes:
a first contact region joining step of rolling the first roller from a center side in a drum axis direction of the contact region to the inner end of the one non-contact region on the overlapping portion to press the first roller; and
a second contact region joining step of rolling the second roller from a center side in a drum axis direction of the contact region to the inner end of the other non-contact region on the overlapping portion and pressing the second roller,
the second contact area bonding step is started later than the first contact area bonding step.
3. The method of manufacturing a green tire according to claim 2,
the first non-contact region bonding step is performed subsequent to the first contact region bonding step,
the second non-contact region bonding step is performed subsequent to the second contact region bonding step.
4. The method of manufacturing a green tire according to claim 2 or 3,
the pressing force of the first roller in the first non-contact area joining step is larger than the pressing force of the first roller in the first contact area joining step.
5. The method of manufacturing a green tire according to any one of claims 2 to 4,
the pressing force of the second roller in the second non-contact area bonding step is larger than the pressing force of the second roller in the second contact area bonding step.
6. The method of manufacturing a green tire according to any one of claims 2 to 5,
the moving speed of the second roller in the second contact region joining step is greater than the moving speed of the first roller in the first contact region joining step.
7. The method of manufacturing a green tire according to any one of claims 2 to 6,
the pressing force of the first roller in the first contact region joining step and the pressing force of the second roller in the second contact region joining step are 0.10 to 0.15 MPa.
8. The method of manufacturing a green tire according to any one of claims 1 to 7,
the moving speed of the first roller in the first non-contact area joining step is the same as the moving speed of the second roller in the second non-contact area joining step.
9. The method of manufacturing a green tire according to any one of claims 1 to 8,
the pressing force of the first roller in the first non-contact region bonding step and the pressing force of the second roller in the second non-contact region bonding step are 0.20 to 0.25 MPa.
10. The method of manufacturing a green tire according to any one of claims 1 to 9,
the first rubber sheet is a rubber material of unvulcanized rubber,
the second rubber sheet is a cord fabric material formed by covering parallel arranged cords with unvulcanized rubber.
11. The method of manufacturing a green tire according to claim 10,
the first rubber sheet is an inner liner layer,
the second rubber sheet is a carcass ply.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020-001613 | 2020-01-08 | ||
| JP2020001613A JP7434904B2 (en) | 2020-01-08 | 2020-01-08 | Raw tire manufacturing method |
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| Publication Number | Publication Date |
|---|---|
| CN113085238A true CN113085238A (en) | 2021-07-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011354230.XA Pending CN113085238A (en) | 2020-01-08 | 2020-11-27 | Method for manufacturing green tire |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP7434904B2 (en) |
| CN (1) | CN113085238A (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2021109348A (en) | 2021-08-02 |
| JP7434904B2 (en) | 2024-02-21 |
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