Thermoforming of plastic sheet material

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 4475881
SERIAL NO

06418087

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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A method and apparatus are disclosed for holding and feeding a continuous sheet (12) of plastic in an operation such as thermoforming. Articulations (13), such as alternating waveforms, are formed on the edges of the plastic sheet (12) by heating and pressing the edges, producing inwardly facing abutment surface at the edges of the sheet. The sheet is then passed into slots (34) in guide rails (32) with the inside surfaces (35) of the guide rails (32) engaging the abutment surfaces on the plastic sheet (12) to prevent the sheet from slipping out of the guide rails. The plastic sheet is thereby held firmly so that it can be passed through such thermoforming operations as heating in an oven (14), forming with a mold at a forming station (40), and cutting the formed articles away from the remainder of the sheet by a trim press (53). The sheet is advanced in increments through the thermoforming apparatus by a sheet advance mechanism (48) which alternately grasps the sheet to advance it and then releases the sheet while the forming and trimming operations are carried out. Sheet stretching guide rails (90) hold the sheet at the mold and are mounted to move outwardly to stretch the heated sheet as the mold engages the sheet. The stretch on the sheet is released as the mold disengages. The stretching of the sheet during forming compensates for the tendency of the formed sheet to shrink as it cools.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
PLACON CORPORATIONMADISON, WI11

International Classification(s)

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  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Borst, Rodney D Oregon, WI 24 787
Herr, Daniel C Waunakee, WI 2 24

Cited Art Landscape

Patent Info (Count) # Cites Year
 
GENERAL MILLS, INC. (1)
* 4289470 Lasagna noodle rippler 10 1980
* Cited By Examiner

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
Other [Check patent profile for assignment information] (1)
* 9988169 Deep-drawing packaging machine 0 2013
 
D&D MANUFACTURING, LLC (1)
8518202 Method and apparatus for forming a shaped multilayered molded article 1 2009
 
Cincinnati Milacron Inc. (1)
* 4954066 Thermoforming and conveyor chain guide apparatus 4 1988
 
CERTAINTEED CORPORATION (3)
* 7108495 Apparatus for continuous forming shaped polymeric articles 1 2001
6752610 Apparatus for continuous forming shaped polymeric articles 0 2001
* 2002/0033,563 Apparatus for continuous forming shaped polymeric articles 0 2001
 
Johnson Engineering, Inc. (1)
D552907 Product display unit 0 2005
 
MATTEL, INC. (2)
7690964 Toy ramp devices 25 2007
7537509 Toy track devices 15 2007
 
KIMBERLY-CLARK WORLDWIDE, INC. (6)
6971542 Reach-in wipes with enhanced dispensibility 12 2002
6848595 Wipes with a pleat-like zone along the leading edge portion 8 2002
* 2004/0115,393 REACH-IN WIPES WITH ENHANCED DISPENSIBILITY 2 2002
7078087 Wipes with an edge treatment along a leading edge portion 1 2003
* 2005/0142,336 Wipes with an edge treatment along a leading edge portion 5 2003
7465266 Process and apparatus for producing wipes with a pleat-like zone along the leading edge portion 3 2004
 
Gam Impianti S.A. (1)
* 6224366 On-line thermoforming machine 1 1998
 
SUMITOMO HEAVY INDUSTRIES, LTD. (2)
* 5290167 Method of manufacturing three-dimensional parts using sheets of thermoplastic resin high-performance fiber-reinforced composite material and apparatus therefor 5 1991
* 5431871 Method for manufacturing three-dimensional parts from a fiber-reinforced resin composite 4 1993
 
Equipements de Transformation IMAC (2)
6852191 Method and apparatus for manufacturing pressure sensitive adhesive label stocks with printing under adhesive and product produced thereby 2 2002
* 2004/0022,983 Method and apparatus for manufacturing pressure sensitive adhesive label stocks with printing under adhesive and product produced thereby 0 2002
 
NIEN, HSU PI-CHU (1)
* 4711005 Method and apparatus for making slats for window blinds and the like from a continuous web of plastic material 17 1986
 
Portage Plastics Corporation (1)
* 6070723 Reclosable package and method 46 1999
 
DYNAFLEX INTERNATIONAL, INC. (1)
* 2007/0266,626 Root barrier 0 2006
* Cited By Examiner