Screw pair and co-rotating intermeshing twin-screw extruder provided with screw pair

Abstract

A screw pair includes first and second screws (14a, 14b) each having an outer peripheral surface (9) in which a groove (8) is helically formed, and transports a starting material in an X1 direction along the axis. The inner side surface of the groove (8) of each of the screws (14a, 14b) includes a first surface (8a) facing the X1 direction and formed such that the outer peripheral surfaces (9) of the screws (14a, 14b) are fitted with no clearance therebetween in the state where the screws (14a, 14b) mesh with each other, and a second surface (8b) facing an X2 direction opposite to the X1 direction and forming a clearance between the outer peripheral surfaces (9) of the screws (14a, 14b) in the state where the screws (14a, 14b) mesh with each other.

Description

technical field [0001] The present invention relates to a screw pair for a co-rotating intermeshing twin-screw extruder which removes a liquid component from a thermoplastic synthetic resin raw material containing the liquid component. Background technique [0002] For example, in a thermoplastic synthetic resin raw material (hereinafter simply referred to as a synthetic resin raw material) such as plastic or rubber containing a liquid component such as water, the synthetic resin raw material is molded into a synthetic resin molded product after the liquid component is removed. When removing a liquid component from a synthetic resin raw material, in the prior art, a co-rotating intermeshing twin-screw extruder (hereinafter simply referred to as an extruder) is used. [0003] refer to Figure 17 (a) and 17(b) describe extruders used when removing liquid components from synthetic resin raw materials. Figure 17 (a) and 17(b) are a top sectional view and a side sectional view s...

AI Technical Summary

Problems solved by technology

[0014] However, in the angular flight screw member 7, when the synthetic resin raw material is conveyed, a part of the synthetic resin raw material may adhere to the first surface 8a

It is n

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