Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting
Patent
1986-09-02
1987-11-03
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
264509, 264547, 264553, 264554, 425173, 425388, B29C 5110, B29C 5116, B29C 5136
Patent
active
047042370
ABSTRACT:
An improved vacuum forming process for forming a deep drawn plastic article with a flange in an area of high forming stresses wherein a mold mounted on a base forms the shape of the article. A sheet of hot plastic material is placed over the mold and a vacuum is drawn to form the plastic sheet into the shape of the mold to form the article. The improvement is forming a character in the mold portion that forms the flange in the area of the high forming stress, said character having dimensions such that properly heated plastic sheet material will be imprinted with a predetermined clarity during the molding operation. A heated sheet of plastic material is placed over the mold and a vacuum is drawn to draw the plastic material around the mold including the mold portion that forms the flange in an area of high forming stresses. The plastic material is then solidified and removed from the mold. The flange is visually inspected to determine if the imprinted character has the predetermined clarity. If it does, the plastic material was heated to the proper temperature for the molding operation. If it does not, it means that the plastic material was not heated to the proper temperature and the area will be subjected to stress cracking and therefore the article is defective and should be discarded.
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Taylor, Jr. Benson T.
Werkmeister Robert L.
Bartholomew James
General Electric Company
Reams Radford M.
Silbaugh Jan H.
Weidner Frederick P.
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