Patent ID: 7195471
Filing Date: 2007-03-27
Classification: B29C

Abstract:
1. A tubular film die head for extruding single-layer or multi-layer film, comprising: an annular die gap; and at least two fastening elements having coolant-carrying capability, said fastening elements passing through holes in said die head and fixing at least two components which together border areas bearing plastic melt within the tubular film die head against one another, at least one of said fastening elements having a coolant intake line formed therein and at least one of said fastening elements having a coolant discharge line formed therein, said fastening elements being loosely constrained in said holes between opposite ends of said fastening elements, coolant running through said coolant lines resulting in said die head having a higher temperature during operation than a temperature of said fastening elements, said die plate at said higher temperature expanding more than said fastening elements to increase a force exerted by said fastening elements in fixing said components together.