Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Reexamination Certificate
2007-04-04
2011-10-04
Del Sole, Joseph (Department: 1743)
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
C264S241000
Reexamination Certificate
active
08029718
ABSTRACT:
The invention relates to a rotomolding process for forming a multi-layer article of two different polymers with different melting points in which an outer layer polymer powder is added to a rotational molder along with an inner layer polymer powder that is separated from the outer layer powder by a release film. The release film has a particular melting point that is greater than that of the outer layer polymer and preferably between the melting points of the inside layer and outside layer polymers. In one embodiment, the release layer forms an enclosure or bag in which the inner layer (higher melting point) powder is enclosed. In another embodiment the release film forms a barrier between an insulated cavity and the mold. The process provides a means for a “one-shot” rotomolding method.
REFERENCES:
patent: 4721159 (1988-01-01), Ohkochi et al.
patent: 4952350 (1990-08-01), Duffy
patent: 4988549 (1991-01-01), Meyer et al.
patent: 6555243 (2003-04-01), Flepp et al.
patent: 2002/0012806 (2002-01-01), Flepp et al.
patent: 2005/0115753 (2005-06-01), Pemberton et al.
patent: 2006/0251835 (2006-11-01), Maziers et al.
patent: 2007/0254174 (2007-11-01), O'Brien et al.
patent: 2008/0145582 (2008-06-01), Spence et al.
patent: 2008/0224349 (2008-09-01), Wang et al.
patent: 48-74741 (1973-07-01), None
patent: WO2004045849 (2004-09-01), None
Clay Bruce
O'Brien Gregory S.
Partridge Ronald
Arkema Inc.
Del Sole Joseph
Kennedy Timothy
Roland Thomas F.
LandOfFree
Process for forming multi-layer molded articles does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for forming multi-layer molded articles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for forming multi-layer molded articles will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4282846