Tubular-molded-body production method and tubular-molded-body production device
AssigneeKaneka Corporation
InventorKengo Fukushima
Life of this patent
Estimating the term…
Abstract
In order to suppress unsteady movement of a molten resin tube in a preliminary water tank in a preceding stage of a vacuum water tank and to improve stability of continuous extrusion of the molten resin tube, in a tubular-molded-body production method, a cooling step includes the steps of: introducing a molten resin tube (P) into a preliminary water tank (20) to which cooling water is continuously supplied and then into a vacuum water tank (30) which is connected to the preliminary water tank (20), and suppressing, with use of a jig (40), direct hit of a flow of the cooling water on the molten resin tube (P) by installing the jig (40) in the preliminary water tank (20).
Claims9
A tubular-molded-body production method, comprising the steps of:
- extruding a molten resin composition from an annular die and forming a molten resin tube;
- and
- cooling the molten resin tube,
- the step of cooling including the steps of:
- introducing the molten resin tube into a preliminary water tank to which cooling water is continuously supplied and then into a vacuum water tank which is connected to the preliminary water tank, and
- suppressing, with use of a jig, direct hit of a flow of the cooling water on the molten resin tube by installing the jig in the preliminary water tank.
A tubular-molded-body production device, comprising:
- an extrusion section that has an annular die for extruding a molten resin composition into a tubular shape;
- and
- a cooling section that cools the molten resin tube extruded from the annular die,
- the cooling section including a preliminary water tank and a vacuum water tank connected to the preliminary water tank, and being configured such that the molten resin tube is introduced into the preliminary water tank and then into the vacuum water tank,
- the preliminary water tank including a supply section that continuously supplies cooling water into the preliminary water tank, and
- the preliminary water tank being provided therein a jig, and suppressing, with use of the jig, direct hit of a flow of the cooling water from the supply section on the molten resin tube.
Dependencies are inferred from the claim text.