Apparatus and process for making a tape useful as a tire cap ply

Inactive Publication Date: 2005-03-03
22 Cites 29 Cited by

AI-Extracted Technical Summary

Problems solved by technology

However, such constructions are subject to belt-edge separation failures because the adhesion of the reinforcement to the tire rubber is inadequate.
In addition, there is a limitation on the extension of the belt, since the cap ply is applied over the belt.
These are inherently high cost/labor intensive procedures.
Because of the slitting step, there may be cut cords on the edges of the tape, which may create edge fray.
Consequently, such a process produces a fair amount of scrap material.
Moreover, the tape so produced can be non-uniform, due...
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Method used

[0033] With the present invention, because the individual cords are dipped in a cement, the cords have better access to the cement than to rubber in the prior art, because rubber does not flow as well as cement. Thus more complete coverage of the cords, either individually, or in the fabric, can be achieved as compared to processes of the prior art. Consequently, with the present invention it is possib...
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Benefits of technology

[0009] In addition, the process of the present invention is not as labor intensive as the slit rubberized fabric process of the prior art, as it does not involve slitting of fabric. In addition, it is not as capital intensive as the slit rubberized fabric process, as it does not require a calender roll. Moreover, the process of the present invention avoids the potential for error in that it does not have a slitting step, and hence the possibility of non-uniformity due to the possibl...
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An apparatus and process are used to make tape which can be used as cap plies, breakers and reinforcement in the carcass of tires. The tape is made by dipping a plurality of single end cords in a solvent-based cement. The cords are converged before entering the dip pan so that they are fixed in a single plane when they are dipped. The cement, which comprises solvent and an elastomeric composition, is dried so that the majority of the solvent evaporates. The elastomeric composition remains, encapsulating the cords, thereby forming the tape.

Application Domain

Layered productsTyres +4

Technology Topic

Mechanical engineeringElastomer +3


  • Apparatus and process for making a tape useful as a tire cap ply
  • Apparatus and process for making a tape useful as a tire cap ply
  • Apparatus and process for making a tape useful as a tire cap ply


  • Experimental program(1)


[0036] A tape may be made using the apparatus of FIG. 2 from a plurality of single end cords, such as T-728, commercially available from DUSA, International. The cords may then be sent to a dip pan, where an rfl dip, may be applied. This dip may be made by adding water, sodium hydroxide (NaOH), or caustic pellets, resourcinol flake and formaldehyde to a tank, to form a sollution with a solids content of about 6%. The solution should be mixed for approximately 30 minutes. This solution may then aged for a minimum of about 3 hours (minimum of 2 hours, maximum of 4 hours). In another tank, a latex may be added. Then water may be mixed with ammonium hydroxide, NH4OH, and added to the latex slowly.
[0037] Then an anti-foaming agent may be added to form a solution, which should be mixed slowly. This solution may have a solids content of about 35%. This solution may then combined with the solution from the first tank. The combined solutions should be mixed together for about 30 minutes prior to use. The cords should be dipped in this combined solution for about 3 seconds. The dip should then be dried in an oven at a temperature of about 226° C., for a dwell time in the range of 100 and 200 seconds. The cords should then be sent to another oven, where the dip may be dried at a temperature of 165° C. The cords may then be dipped in a cement dip pan. The cement in the cement dip pan may be a mixture of a solvent, such as toluene, (85 kg) and a rubber-based elastomeric composition (15 kg), such as natural rubber, natural rubber and styrene butadiene, or styrene butadiene and polybutadiene. Any of these may be mixed with reinforcing agents, activators and/or plasticizers. The cement should be dried in an oven at a temperature of 110° C., so that the toluene is driven off. A tape which is about {fraction (1/2)} inch wide may thus be formed.


Fraction9.0E-6 ~ 0.05fraction
Percent by mass9.0E-4 ~ 5.0mass fraction

Description & Claims & Application Information

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