Patent · US Expired

Injection molding machine having a moveable screw with a stop position

US6835058B2 · kind B2 · utility

1Cited by

5References

3Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Axel Kaminski · Wermelskirchen, DE
Klaus Schürmann · Jüchen, DE

Key dates

Filing date	Jun 3, 2002
Grant date	Dec 28, 2004
Priority date	—
Expiry date	Jan 29, 2023

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB29C45/50
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

An injection-molding machine is disclosed. The machine has an injection unit and nozzle and the injection unit includes a tubular cylinder and a screw that is capable of back and forth movements along the tubular cylinder. Means are provided to stop the movement of the screw at its end/stop position at a distance from the nozzle so as to form a gap between the screw head and nozzle. The gap has a volume of more than and up to the volume of a shot wherein D is the dimension of a single screw stroke. The use of the machine yields molded articles that are virtually streak free.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.