Claims
- 1. A process for producing twin-sheet thermoformed articles having a reinforced portion comprising the steps of:
- (a) heating a first sheet and a second sheet of thermoplastic material;
- (b) forming the heated first and second sheets in first and second molds respectively;
- (c) heating a reinforcing insert of thermoplastic to a forming temperature at which the insert is semi-solid;
- (d) placing the heated reinforcing insert of thermoplastic material on the first sheet after it has been formed in the first mold at a selected location to be reinforced; and
- (e) then pressing the heated second sheet within the second mold into contact with the heated first sheet and the heated reinforcing insert within the first mold to form the reinforcing insert between the sheet so that a fusion of the thermoplastic sheets and the reinforcing insert takes place to produce a continuous integral reinforced section of the article having a desired molded shape.
Parent Case Info
This is a division of application Ser. No. 07/518,011, filed May 2, 1990.
US Referenced Citations (25)
Foreign Referenced Citations (6)
Number |
Date |
Country |
55-124635 |
Sep 1980 |
JPX |
55-159936 |
Dec 1980 |
JPX |
58-167150 |
Oct 1983 |
JPX |
59-118436 |
Jul 1984 |
JPX |
60-232942 |
Nov 1985 |
JPX |
60-236855 |
Nov 1985 |
JPX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
518011 |
May 1990 |
|