Injection mould for sawing cord, method to produce sawing cord and the sawing cord resulting therefrom

US9849615B2 · kind B2 · utility

Assignee

• NV BEKAERT SA · BE

Inventors

• Dieter Ghillebert · Roeselare, BE
• Raf Clauws · Desselgem, BE
• Tom Baekelandt · Dadizele, BE

Key dates

• Filing date: Dec 13, 2012
• Grant date: Dec 26, 2017
• Expiry date: Feb 20, 2035

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29L2031/77
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

In a sawing cord the three constituting elements of steel cord, sawing bead and sleeve polymer in between the beads must work optimally together. In order to improve the injection molding quality the inventors disclose an injection mold wherein the injection channels inject polymer from opposite sides of the steel cord into the injection cavity. The injection mold comprises two half molds that form the injection cavity when closed. Different preferred embodiments are described inclusive the use of channels having a tree structure, preferably a binary channel tree, preferably a balanced binary tree and most preferred a balanced binary tree with equal length pathways from feed channel to each injection channel. The use of heated channels is disclosed and the rules for balancing between the number of heated versus non-heated channels are explained. Furthermore the method to use such mold and the product resulting from the use of the mold are claimed.