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US 4,783,303 AGranted
Method of processing semifinished products made of cross-linked plastic material
AssigneeWirsbo Pex Platzer Schwedenbau GmbH
InventorFriedrich Imgram
Life of this patent
Estimating the term…
Abstract
The cross-linked plastic material is shaped in the softened state, for example, by blow-molding, deep-drawing, pressing, rolling, calendering or stretching and cooled below the softening range while retaining the thus formed shape.
Claims7
A method of processing thermoelastic cross-linked polyolefin, comprising the steps of:
- selecting a tube made of a thermoelastic cross-linked polyolefin and heating said tube to a predetermined temperature range above the crystallite melting point of said thermoelastic cross-linked polyolefin;
- shaping said heated tube and thereby imparting a preselected profile to said heated tube in said predetermined temperature range above said crystallite melting point of said thermoelastic cross-linked polyolefin;
- and
- cooling said heated and profiled tube to a temperature below said crystallite melting point of said thermoelastic cross-linked polyolefin.
1 more element
A method of processing thermoelastic cross-linked material. comprising the steps of:
- selecting as said thermoelastic cross-linked material, a tube made of thermoelastic cross-linked polyolefin;
- heating said tube made of thermoelastic cross-linked polyolefin to a predetermined temperature range above the crystallite melting point of the thermoelastic cross-linked polyolefin;
- placing a preselected length of said tube heated to said predetermined temperature range above said crystallite melting point, into a mold containing corrugated walls;
- blow molding said preselected length of said tube in said mold and in said temperature range above said crystallite melting point and thereby imparting a corrugated profile to said preselected length of said tube heated to said temperature range above said crystallite melting point;
- and
- after profiling, cooling said profiled and heated preselected length of said tube to a temperature below said crystallite melting point of said thermoelastic cross-linked polyolefin.
3 more elements
A method of processing a thermoelastic cross-linked material, comprising the steps of:
- selecting as said thermoelastic cross-linked material, a tube made of a thermoelastic cross-linked polyolefin and having an end section;
- heating said end section of said tube to a predetermined temperature range above the crystallite melting point of said thermoelastic cross-linked polyolefin;
- placing said end section heated to said predetermined temperature range above said crystallite melting point, onto a profiled tube connector and thereby shaping and imparting a preselected profile complementary to said profile of said tube connector to said heated end section placed onto said tube connector in said predetermined temperature range above the crystallite melting point of said thermoelastic cross-linked polyolefin;
- and
- thereafter, cooling said heated and profiled end section below the crystallite melting point, thus firmly and sealingly connecting said profiled end section to said profiled tube connector.
2 more elements
Dependencies are inferred from the claim text.