Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Composite having voids in a component
Patent
1986-03-10
1987-06-30
Van Balen, William J.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Composite having voids in a component
156 90, 181224, 181252, 4283166, 4283171, B32B 100, B32B 709
Patent
active
046770216
DESCRIPTION:
BRIEF SUMMARY
FIELD OF TECHNOLOGY
The present invention relates to an air-stream control valve made of synthetic resin to be used for automative air conditioning apparatuses and the producing method therefor. More particularly, an air-stream control valve of new construction is described having a unitary soft foam sheet is firmly fixed to one side or both sides of the valve body, as well as a specific method to produce this control valve efficiently.
BACKGROUND TECHNOLOGY
In air-stream control valves for automotive air conditioning apparatuses, a soft foam sheet 2 such as polyurethane foam or a soft material made of rubber etc. (a kind of packing) is adhered to the valve body 1 to attenuate the noises to be generated when it hits the case and to prevent the air leakage from the gap between the valve and the case (see FIG. 2). As a producing method of these valves, such methods as that the valve body is produced first, and then the foam sheet above is adhered to it by an adhesive 4 or that the foam forming for the foam layer itself is conducted on the valve body have been adopted. However, the foam sheet adhesion method takes time and shows poor adhesion strength. Further the latter method has a drawback that the foram forming on the valve body also takes much time. On the other hand, although vavle bodies were made of iron sheet in previous time, they have been gradually switched to a synthetic resin in consideration of weights and costs, and especially ABS has been well adopted. However, it also has a drawback of low rigidity.
Therefore, it is better to select a high rigidity material such as polypropylene as the valve body, however if made so, the contact between the valve body and the foam sheet becomes especially poor, tending to peel off, which becomes a new problem.
SUMMARY OF THE INVENTION
In the conventional technology where the valve body is first produced, there are drawbacks as discussed above, which comes to another method where the foam sheet is first produced and thereafter the valve body is unitedly formed together. However this latter method has not been considered seriously so far because of the following reasons. In integral molding, the synthetic resin for forming the valve body excessively permeates into the foam sheet, and thus the softness, elasticity and sealing performances of the sheet disappear, to result in an extreme case in meaninglessness of such a double structure.
The problems the present invention tries to solve reside in this point. As a results, the present inventors gave considerations to the improvement of this point, a new method where the syntehtic resin does not permeate excessively into the foam sheet when in integral molding is developed, and the present inventors succeeded in that the valve body and the foam sheet are firmly fixed together to obtain a superior air-stream control valve.
The air-stream control valve of the present invention is the one where a soft foam sheet is integrally adhered to the valve body of synthetic resin through a resin permeation preventing sheet disposed on one side or both sides of the valve body. The resin permeation preventing sheet is adhered by an adhesive to one side of the soft foam sheet in advance, and then on the resin permeation preventing sheet disposed on the foam sheet is disposed the synthetic resin to form the valve body, or, on the synthetic resin for forming the valve body another form sheet with the resin permeation preventing sheet is disposed in such a manner that the resin permeation preventing sheet faces with the valve body, thereafter the stamping formation process is applied.
As the synthetic resin for forming the valve body, thermoplastic materials such as polypropylene, polyethylene, polysthyrene, ABS, acrylic resin or nylon can be widely usable, and the present method is especially effective for polypropylene which is generally of high rigidity but is poor adhesiveness.
Even if the glass fibers, talc, mica or the like are contained as the filling agent in the synthetic resin for the valve body, the method of the p
REFERENCES:
patent: 4356642 (1982-11-01), Herman
patent: 4360984 (1982-11-01), Ruttenberg
Kayakabe Hiroshi
Mitomi Masaei
Miyajima Mikio
Nakata Shuji
Nishiu Masamichi
Nippondenso Co. Ltd.
Shimizu Industry Company Ltd.
Van Balen William J.
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