VACUUM FORMING PROCESS FOR DEEP DRAWN PLASTIC ARTICLES

VACUUM FORMING PROCESS FOR DEEP DRAWN PLASTIC ARTICLES An improved vacuum forming process for forming a deep drawn plastic article wherein a mold having a hollow cavity and a relatively thick outer shell mounted on a base forms the shape of the article. The shell has a plurality of small passageways...

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Bibliographische Detailangaben
Hauptverfasser:	WERKMEISTER, ROBERT L, TAYLOR, BENSON T., JR
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING PERFORMING OPERATIONS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	VACUUM FORMING PROCESS FOR DEEP DRAWN PLASTIC ARTICLES An improved vacuum forming process for forming a deep drawn plastic article wherein a mold having a hollow cavity and a relatively thick outer shell mounted on a base forms the shape of the article. The shell has a plurality of small passageways through the outer surface connected to relatively large passageways within the outer shell and the passageways are connected to a vacuum pump. 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 improved process provides for a first large passageway interconnected to a plurality of small passageways through the outer surface of the mold outer shell in a first area of the mold outer shell that forms the deep drawn portion of the article and connected in flow communication with a vacuum pump. A second large passageway interconnected to a plurality of small passageways through the outer surface of the mold outer shell in a second area of the mold and connected in flow communication with a vacuum pump. A sheet of hot plastic material is placed over the mold and a vacuum is first drawn through the first large passageway to form the deep draw portion of the article and then a vacuum is drawn through the second large passageway. This improved vacuum forming process provides for thicker material in the deep draw portion of the article than the rest of the article.