Method and device for producing a pipe member
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United States of America Patent
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Apr 26, 2016
Grant Date -
Jul 3, 2014
app pub date -
Jul 17, 2012
filing date -
Jul 26, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
An object of the present invention is to provide a method for producing a pipe, which is capable of reducing the amount of thermoplastic material, without complicating an device for producing a pipe. The present invention provides a method for producing a pipe, comprising a thermoplastic material filling process for filling a die with a thermoplastic material, and a thermoplastic material discharging process for pushing out an unsolidified part of the thermoplastic material in the molding die using pressurized fluid, wherein the thermoplastic material is mixed with a foaming agent, the method further comprises a process for foaming the thermoplastic material filling the molding die, and the thermoplastic material discharging process is a process for pushing out a inner part of the thermoplastic material foamed in the molding die, by using the pressurized fluid prior to solidification of the inner part.
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