Four-compound tire side extrusion pre-die suitable for producing an inlaid white sidewall

Abstract

The present invention relates to a four - compound tire side extrusion pre - die suitable for producing an in - built white sidewall, belonging to the field of tire manufacturing. The pre - die has an asymmetric structure. One side has a bead filler channel and a black sidewall rubber channel, a total of two channels; the other side has a bead filler channel, a black sidewall rubber channel, a white sidewall rubber channel, and a black covering rubber channel, a total of four channels. The plane where all the in - feed ports of the two bead filler channels, the two black sidewall rubber channels, the one white sidewall rubber channel, and the one black covering rubber channel are located is the rear - most surface of the pre - die. The plane where all the out - feed ports of the two bead filler channels, the two black sidewall rubber channels, the one white sidewall rubber channel, and the one black covering rubber channel, the out - feed ports of the black sidewall rubber channel, the out - feed ports of the white sidewall rubber channel, and the out - feed ports of the black covering rubber channel are located is the front - most surface of the pre - die. The two bead filler channels, the two black sidewall rubber channels, the one white sidewall rubber channel, and the one black covering rubber channel all pass through from the rear - most surface of the pre - die to the front - most surface.

Description

Technical Field

[0001] The present invention relates to the field of tire production devices, and more specifically, to a four-composite tire side extrusion pre-profile suitable for producing an inlaid white sidewall. Background Art

[0002] As is well known, with the development of the tire industry, people's demands for tire products are becoming more and more diverse and personalized. Therefore, in order to meet people's personalized needs, some tires with colored sidewalls such as white, red, blue, etc. have emerged. Among various colored tires, currently white sidewall tires are the most widespread and have the largest market sales. White sidewall tires are usually produced by co-extruding three kinds of rubbers, namely black sidewall rubber, white sidewall rubber, and bead wear-resistant rubber, when the sidewall components are extruded. In the white sidewall components produced by this three-composite extrusion, the white rubber is exposed outside. In order to prevent the white rubber from being contaminated during molding or vulcanization and affecting the appearance of the white rubber, the industry usually adopts two methods for treatment. The first method: Through equipment transformation on the extrusion line before the sidewall components enter the cooling water tank, a layer of black film is covered on the white rubber. The molding and vulcanization processes are the same as those of ordinary black sidewall tires. Finally, the black covering film on the white rubber of the vulcanized finished tire is polished off to expose the white rubber, and the production of the white sidewall tire is completed. The second method: The extruded white sidewall is coiled normally like the black sidewall. During the molding stage, a layer of black film is manually laminated on the white rubber to ensure that the white sidewall rubber is completely covered. After vulcanization, the black covering film on the white rubber of the finished tire is polished off to expose the white rubber, and the production of the white sidewall tire is completed.

[0003] It is understood that both domestic and foreign production of white sidewall tires basically adopt the method of hot laminating films during extrusion or manually laminating films during molding. These two methods have different drawbacks. The first method requires equipment transformation in the extrusion process, usually adding a small extruder, a small rubber mill, and a film pasting device. Before the sidewall enters the cooling water tank on the extrusion production line, a black film with appropriate width and thickness after calendering is compounded with the white rubber, and then the black covering film on the white rubber is polished off after vulcanization. This will increase the equipment transformation cost and also improve the operation difficulty of workers. The second method requires adding a step in the molding process, that is, manually laminating a layer of black film on the white sidewall rubber, and then polishing off the black covering film on the white rubber after vulcanization. This method may introduce impurities to contaminate the white rubber because the white rubber is exposed during the cooling and coiling process, and the cooling auxiliary line, cooling water, and padding cloth are in direct contact with the white rubber, affecting the appearance of the white rubber after polishing. Also, because of manually laminating the film, the automation degree of tire molding is reduced, affecting the production efficiency.

[0004] When tire enterprises produce white sidewall tires, they generally do not purchase an additional white sidewall extrusion production line. Instead, they usually use the original black ordinary sidewall production line. Currently, most of the tire sidewall extrusion production lines in China are two-layer or three-layer composite. When using the original die lip device on the existing sidewall extrusion production line, if the equipment is not modified or steps are not added, it is impossible to simultaneously extrude double sidewalls, where one is an ordinary sidewall and the other is an embedded white sidewall. This restricts the development of white and other colored sidewall products by tire enterprises. Summary of the Invention

[0005] In order to overcome the deficiencies of the prior art, the present invention provides a four-layer composite tire sidewall extrusion pre-die lip suitable for producing embedded white sidewalls. It does not require adding a film laminating device in the extrusion process, nor does it require manually laminating black films in the molding process. It can simultaneously extrude double sidewalls, where one is an ordinary sidewall and the other is an embedded white sidewall. That is, from the cross-section view, the white rubber is embedded in the middle and surrounded by black rubber on all sides.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a four-layer composite tire sidewall extrusion pre-die lip suitable for producing embedded white sidewalls, provided with a pre-die lip, characterized in that the pre-die lip includes two black sidewall rubber channels, two sub-bead rubber channels, one white sidewall rubber channel, and one black covering rubber channel. The pre-die lip is an asymmetric structure. On one side, there is one sub-bead rubber channel and one black sidewall rubber channel, a total of two channels; on the other side, there is one sub-bead rubber channel, one black sidewall rubber channel, one white sidewall rubber channel, and one black covering rubber channel, a total of four channels. The planes where the in-gate openings of the sub-bead rubber channels, black sidewall rubber channels, white sidewall rubber channels, and black covering rubber channels of the two sub-bead rubber channels, two black sidewall rubber channels, one white sidewall rubber channel, and one black covering rubber channel are located are the rear face of the pre-die lip. The planes where the out-gate openings of the sub-bead rubber channels, black sidewall rubber channels, white sidewall rubber channels, and black covering rubber channels of the two sub-bead rubber channels, two black sidewall rubber channels, one white sidewall rubber channel, and one black covering rubber channel are located are the front face of the pre-die lip. The two sub-bead rubber channels, two black sidewall rubber channels, one white sidewall rubber channel, and one black covering rubber channel all pass through from the rear face of the pre-die lip to the front face.

[0007] The out-gate opening of the black covering rubber channel of the pre-die lip is rectangular, with a width of 2 mm - 4 mm; the out-gate opening of the white sidewall rubber channel is trapezoidal in reverse, with a distance between the upper and lower sides of 4.5 mm - 6.5 mm; the lower side of the out-gate opening of the white sidewall rubber channel is 2 mm - 4 mm away from the lower side of the out-gate opening of the black sidewall rubber channel. The out-gate openings of the black covering rubber channel, white sidewall rubber channel, and black sidewall rubber channel are arranged in sequence from top to bottom, and the out-gate opening of the black covering rubber channel and the out-gate opening of the black sidewall rubber channel completely surround the out-gate opening of the white sidewall rubber channel.

[0008] The glue inlets of the described black rubber-coated channel, white sidewall rubber channel, black sidewall rubber channel, and bead rubber channel are all rectangular and are arranged in sequence from top to bottom directly behind the pre-profile.

[0009] The beneficial effects of the present invention are that by adding only one sidewall pre-profile to a four-compound extrusion production line, an inlaid white sidewall composed of four kinds of rubber compounds with different widths can be directly extruded. There is no need to add a film laminating device in the extrusion process, nor is it necessary to manually laminate black films in the forming process. Double sidewalls can be extruded simultaneously, with one being a common sidewall and the other being an inlaid white sidewall. That is, from the cross-section view, the white rubber is embedded in the middle and surrounded by black rubber all around. This can not only greatly save the equipment transformation cost, reduce the labor intensity of workers, but also improve production efficiency and enhance the market competitiveness of products. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is the front view of the present invention.

[0011] Figure 2 is the rear view of the present invention.

[0012] Figure 3 is the isometric view of the present invention.

[0013] Figure 4 is the schematic plan view of all the glue outlets of the present invention.

[0014] Figure 5 is the schematic plan view of one side of the glue outlet of the white sidewall channel of the present invention.

[0015] Figure 6 is the schematic plan view of all the glue inlets of the present invention.

[0016] Figure 7 is the schematic structural view of the inlaid white sidewall suitable for production by the present invention.

[0017] Figure 8 is the schematic structural view of the outer profile plate used in conjunction with the present invention.

[0018] In the figures, 1. bead rubber channel, 2. black sidewall rubber channel, 3. white sidewall rubber channel, 4. black rubber-coated channel, 5. glue inlet of bead rubber channel, 6. glue inlet of black sidewall rubber channel, 7. glue inlet of white sidewall rubber channel, 8. glue inlet of black rubber-coated channel, 9. glue outlet of bead rubber channel, 10. glue outlet of black sidewall rubber channel, 11. glue outlet of white sidewall rubber channel, 12. glue outlet of black rubber-coated channel, 13. outer profile plate, 14. opening of outer profile plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0020] As Figure 1 , Figure 2 , Figure 3 shown, the pre-profile includes two sub-bead rubber channels 1, two black sidewall rubber channels 2, one white sidewall rubber channel 3, and one black cover rubber channel 4. The pre-profile has an asymmetric structure. On one side, there is one sub-bead rubber channel 1 and one black sidewall rubber channel 2, a total of two channels; on the other side, there is one sub-bead rubber channel 1, one black sidewall rubber channel 2, one white sidewall rubber channel 3, and one black cover rubber channel 4, a total of four channels. The entire glue inlets of the two sub-bead rubber channels 1, two black sidewall rubber channels 2, one white sidewall rubber channel 3, and one black cover rubber channel 4, that is, the glue inlets 5 of the sub-bead rubber channels, the glue inlets 6 of the black sidewall rubber channels, the glue inlets 7 of the white sidewall rubber channels, and the glue inlets 8 of the black cover rubber channels, are located in a plane which is the rear face of the pre-profile. The entire glue outlets of the two sub-bead rubber channels 1, two black sidewall rubber channels 2, one white sidewall rubber channel 3, and one black cover rubber channel 4, that is, the glue outlets 9 of the sub-bead rubber channels, the glue outlets 10 of the black sidewall rubber channels, the glue outlets 11 of the white sidewall rubber channels, and the glue outlets 12 of the black cover rubber channels, are located in a plane which is the front face of the pre-profile. The two sub-bead rubber channels 1, two black sidewall rubber channels 2, one white sidewall rubber channel 3, and one black cover rubber channel 4 all pass through from the rear face of the pre-profile to the front face.

[0021] As Figure 4 , Figure 5 shown, the glue outlet 12 of the black cover rubber channel of the pre-profile is approximately rectangular, with a width of 2 mm - 4 mm; the glue outlet 11 of the white sidewall rubber channel is trapezoidal in reverse, with the distance between its upper and lower sides being 4.5 mm - 6.5 mm; the lower side of the glue outlet 11 of the white sidewall rubber channel is 2 mm - 4 mm away from the lower side of the glue outlet 10 of the black sidewall rubber channel. The glue outlet 12 of the black cover rubber channel, the glue outlet 11 of the white sidewall rubber channel, and the glue outlet 10 of the black sidewall rubber channel are arranged in sequence from top to bottom on the front face of the pre-profile, and the glue outlet 12 of the black cover rubber channel and the glue outlet 10 of the black sidewall rubber channel completely surround the glue outlet 11 of the white sidewall rubber channel therein.

[0022] As Figure 2 , Figure 6 shown, the glue inlets 8 of the black cover rubber channel, the glue inlets 7 of the white sidewall rubber channel, the glue inlets 6 of the black sidewall rubber channel, and the glue inlets 5 of the sub-bead rubber channels of the pre-profile are all rectangular, and are arranged in sequence from top to bottom on the rear face of the pre-profile.

[0023] As Figure 4 , Figure 5 , Figure 6As shown, the sub-gum channel 1 of the pre-profile has one sub-gum channel inlet 5 and two sub-gum channel outlets 9; the black sidewall gum channel 2 of the pre-profile has one black sidewall gum channel inlet 6 and two black sidewall gum channel outlets 10; the white sidewall gum channel 3 of the pre-profile has one white sidewall gum channel inlet 7 and one white sidewall gum channel outlet 11; the black cover gum channel 4 of the pre-profile has one black cover gum channel inlet 8 and one black cover gum channel outlet 12.

[0024] As Figure 4 , Figure 6 shown, the sub-gum channel inlet 5 at the back of the pre-profile is connected to the sub-gum channel outlet 9 in front of the pre-profile to form the sub-gum channel 1; the black sidewall gum channel inlet 6 at the back of the pre-profile is connected to the black sidewall gum channel outlet 10 in front of the pre-profile to form the black sidewall gum channel 2; the white sidewall gum channel inlet 7 at the back of the pre-profile is connected to the white sidewall gum channel outlet 11 in front of the pre-profile to form the white side channel 3; the black cover gum channel inlet 8 at the back of the pre-profile is connected to the black cover gum channel outlet 12 in front of the pre-profile to form the black cover gum channel 4.

[0025] As Figure 7 shown, using this pre-profile can extrude two sidewalls simultaneously. The left sidewall is composed of two kinds of compound gums, namely sub-gum and black sidewall gum, and the right sidewall is composed of four kinds of compound gums, namely sub-gum, black sidewall gum, white sidewall gum, and black cover gum, that is, an inlaid white sidewall.

[0026] If you want to produce Figure 7 shown sidewall structure, the sub-gum flows through the sub-gum channel 1 of the pre-profile to reach the inner side of the outer profile plate opening 14 of the outer profile plate 13, the black sidewall gum flows through the black sidewall gum channel 2 of the pre-profile to reach the inner side of the outer profile plate opening 14 of the outer profile plate 13, the white sidewall gum flows through the white sidewall gum channel 3 of the pre-profile to reach the inner side of the outer profile plate opening 14 of the outer profile plate 13, the black cover gum flows through the black cover gum channel 4 of the pre-profile to reach the inner side of the outer profile plate opening 14 of the outer profile plate 13. The four kinds of gums, namely sub-gum, black sidewall gum, white sidewall gum, and black cover gum, converge on the inner side of the outer profile plate opening 14 of the outer profile plate 13 and flow through the sidewall outer profile plate opening 14 together to complete Figure 7 shown double sidewall extrusion of the structure.

[0027] Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that the above embodiments are illustrative only and do not limit the scope of the present invention. Simple modifications made by those skilled in the art based on the design concept of the present invention, such as extruding the white sidewall rubber on the left side and changing the cross-sectional shape of the white sidewall rubber to a rectangular shape or other shapes, should all be covered within the scope of the claims of the present invention.

Claims

1. A four - compound tire side extrusion pre - die suitable for producing an in - built white sidewall, provided with a pre - die, characterized in that The pre-profile includes two black sidewall rubber channels, two beaded rubber channels, one white sidewall rubber channel, and one black cover rubber channel. The pre-profile is an asymmetric structure, with one beaded rubber channel and one black sidewall rubber channel on one side, a total of two channels; On the other side, there is one beaded rubber channel, one black sidewall rubber channel, one white sidewall rubber channel, and one black cover rubber channel, a total of four channels. The planes where the beaded rubber channel inlets, black sidewall rubber channel inlets, white sidewall rubber channel inlets, and black cover rubber channel inlets of the two beaded rubber channels, two black sidewall rubber channels, one white sidewall rubber channel, and one black cover rubber channel are located are the rear surfaces of the pre-profile. The planes where the beaded rubber channel outlets, black sidewall rubber channel outlets, white sidewall rubber channel outlets, and black cover rubber channel outlets of the two beaded rubber channels, two black sidewall rubber channels, one white sidewall rubber channel, and one black cover rubber channel are located are the front surfaces of the pre-profile. The two beaded rubber channels, two black sidewall rubber channels, one white sidewall rubber channel, and one black cover rubber channel all pass through from the rear surface to the front surface of the pre-profile. The outlet of the black cover rubber channel of the pre-profile is rectangular, with a width of 2 mm - 4 mm; the outlet of the white sidewall rubber channel is trapezoidal in reverse, with a distance between the upper and lower sides of 4.5 mm - 6.5 mm; the lower side of the outlet of the white sidewall rubber channel is 2 mm - 4 mm away from the lower side of the outlet of the black sidewall rubber channel; the outlets of the black cover rubber channel, white sidewall rubber channel, and black sidewall rubber channel are arranged in sequence from top to bottom, and the outlet of the black cover rubber channel and the outlet of the black sidewall rubber channel completely surround the outlet of the white sidewall rubber channel. The inlets of the black cover rubber channel, white sidewall rubber channel, black sidewall rubber channel, and beaded rubber channel are all rectangular and are arranged in sequence from top to bottom on the rear surface of the pre-profile.

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