Method for producing pneumatic tyre and device for molding green tyre
A technology for a pneumatic tire and a manufacturing method, which is applied in the field of pneumatic tire manufacturing and green tire molding devices, can solve problems such as residual air, poor molding, and insufficient adhesion, and achieve the effects of suppressing defective products and increasing the pressing length.
Inactive Publication Date: 2013-05-15
SUMITOMO RUBBER IND LTD
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- Application Information
AI Technical Summary
Problems solved by technology
Such a non-pressing portion f is not in sufficient close contact with the extruded portion c and the main body portion g, and air may remain inside.
In addition, if a large amount of air remains inside the raw tire t, there will be problems such as poor molding during vulcanization or a significant deterioration in durability.
Method used
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Examples
Experimental program
Comparison scheme
Effect test
Embodiment
[0084] In order to confirm the effects of the present invention, 20 green tires (tire size "215 / 60R16 95H") were formed each according to the pattern of the winding process shown in Table 1, and after vulcanization, the occurrence of surface irregularities on the sidewall parts was investigated. (expansion caused by internal air) and the incidence of processing defective products. The results are all represented by an index of 100 in Comparative Example 1 in which the roll was moved parallel to the radial direction to wind up the extruded part, and the smaller the numerical value, the better. Table 1 shows the results of the test.
[0085] Table 1
[0086]
[0087] As a result of the test, it was confirmed that the occurrence rate of defective products was drastically reduced by the methods of the examples.
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The present invention can improve a rolling procedure of tire component. The invention uses a green tire molding device for manufacturing the tire. The device of the invention comprises a molding drum (2) and an adhibiting device (4) configured at two sides of molding drum. The adhibiting device comprises the following components: sliding components (7) which can move in the axial direction of molding drum; and rock arms (8) which are axially provided with rollers (8B) with a free rotation mode. A tire component (10) is coiled to a cylinder shape in the area comprising the molding drum and rock arms and furthermore one pair of tire bead cores (15) are inserted into the tire component (10), so that the tire component between the tire bead cores (15) is expanded for forming a body part (20). Relative rotation is endowed between the body part (20) and the sliding components (20) and furthermore the sliding components are caused to move along the axial direction to the molding drum. Therefore a roller contacting with an extrusion part (21) of tire component moves along the body part from the inner side to the out side of radial direction with relative radial tilt thereby rolling the extrusion part.
Description
technical field [0001] The present invention relates to a method for manufacturing a pneumatic tire and a green tire building apparatus that reduce sticking failures by improving a tire component rolling process and the like during green tire building. Background technique [0002] In the manufacturing process of a general pneumatic tire, first, a tire component including a carcass ply is cylindrically wound on a building drum, and then a pair of bead cores are inserted, so that the tire component between the pair of bead cores is Inflated and deformed into a ring shape, and the extruded portion of the tire component that is closer to the axially outer side of the bead core than the bead core is rolled up in the vicinity of the bead core to form a green tire (also called "low cover" or "green tire ”), and vulcanize it with a mold. In addition, conventionally, as a method of molding a green tire, the proposals of the following Patent Documents 1 to 3 have been proposed. [...
Claims
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IPC IPC(8): B29D30/26B29D30/06
Inventor 大平准司
Owner SUMITOMO RUBBER IND LTD