| 摘要 |
<p>An impervious article of plastic material including a reinforcing frame member imperviously sealed within the plastic material which forms an outer covering thereof, is obtained by disposing the reinforcing frame member within a channel formed in shock resistant thermoplastic material, by heating a portion of the shock resistant thermoplastic material on outer sides thereof opposite sides defining the channel in which the reinforcing member is disposed, and over an area near an open portion of the channel to at least the softening point of the shock resistant plastic material, and then injecting a compatible plastic material substantially resistant to cracking under stress onto the outer sides of the thermoplastic material and over the open part of the channel in which the reinforcing member is disposed. Then the injected plastic material and the heated portion of the thermoplastic material are allowed to cool, so that the injected plastic material becomes heat welded to the thermoplastic material to thus form a capping over the reinforcing frame member substantially resistant to cracking under stress.</p> |
