Processes Of Shaping By Shrinking Patents (Class 264/DIG71)
  • Method for producing receptacles from thermoplastic resin foam sheet
    Patent number: 3967991
    Abstract: A method for producing receptacles of a thermoplastic resin foam sheet, which comprises forming a cylinder of a rectangular-shaped uni-directionally shrinkable thermoplastic resin foam sheet which, when heated, shrinks in a first direction to a greater extent than other directions perpendicular to said first direction, so that when heated, the thermoplastic resin foam sheet will shrink toward the central axis of the cylinder; bonding the side edges of the sheet forming the cylinder; heating the foam sheet on a molding form to a temperature above the softening point of the resin, whereby the cylindrical foam sheet shrinks toward the central axis of the cylinder formed by the sheet and intimately contacts the circumferential side wall of the molding form to form a bottomless or gathered cylindrical article; and compression-molding the article under heat to form a thermostatic resin foam receptacle.
    Type: Grant
    Filed: December 7, 1973
    Date of Patent: July 6, 1976
    Assignee: Sekisui Kaseihin Kogyo Kabushiki Kaisha
    Inventors: Ikuya Shimano, Takashi Matsui
  • Wrap around heat shrinkable article
    Patent number: 3959052
    Abstract: An article and method for preparing wraparound closures for cables, pipes, splices, and junctions to effect repair, insulation, waterproofing and the like are described. The article is a generally rectangular sheet of a plastic material which has the property of shrinking toward its original dimensions when it is heated after having been stretched at elevated temperature and cooled while in stretched condition. The sheet has a large central section which has been hot stretched and cooled and two small end sections which have not been stretched. The wrap-around closure is made by wrapping the sheet loosely around the object to be enclosed and bringing the two end sections together so that one overlays the other, one or both of the facing surfaces of the end sections is coated with a thin layer of a lower alkyl cyanoacrylate adhesive. The end sections rapidly and strongly adhere to each other. The wrap-around sheet is then heated to a temperature in the range about 250.degree.-375.degree.F.
    Type: Grant
    Filed: March 21, 1975
    Date of Patent: May 25, 1976
    Assignee: Sigmaform Corporation
    Inventor: Mark J. Stanek
  • Pretreatment of polytetrafluoroethylene filter bags
    Patent number: 3957938
    Abstract: Polytetrafluoroethylene bags used in solids filtering units are preshrunk to preclude tearing or ripping of the bags.
    Type: Grant
    Filed: October 21, 1974
    Date of Patent: May 18, 1976
    Assignee: Phillips Petroleum Company
    Inventor: Mark L. Gravley