Title:
SCREW FOR INJECTION MOLDING MACHINE, INJECTION MACHINE, AND INJECTION MOLDING MACHINE
Document Type and Number:
Japanese Patent JP2022063938
Kind Code:
A
Abstract:
To provide a screw of an injection molding machine that can make a waste shot number in changing colors smaller.SOLUTION: A step part flight (28) is formed on a screw (18) of an injection molding machine. The step part flight (28) is a flight in which a step-shaped step part is formed on a top part thereof. The top part consists of a large-diameter part (31) on an upstream side and a land part (32) on a downstream side. In the step part flight (28), a step (33) between the large-diameter part (31) and the land part (32) is selected for a size larger than 0.5 mm and 0.8 mm or less. It is preferable that a flight width B1 and a width B2 of the land part in a direction perpendicular to a lead angle be selected such that the width B2 becomes 0.6 to 0.9 times of the width B1.SELECTED DRAWING: Figure 4
Inventors:
YUFU TAKUYA
KASHIWABARA YUGO
NAKAGAWA KAZUMA
KASHIWABARA YUGO
NAKAGAWA KAZUMA
Application Number:
JP2020172354A
Publication Date:
April 25, 2022
Filing Date:
October 13, 2020
Export Citation:
Assignee:
JAPAN STEEL WORKS LTD
International Classes:
B29C45/50
Attorney, Agent or Firm:
Yoshiaki Sugitani
Yutsugu Sugitani
Yutsugu Sugitani