Injector for injection moulding of plastic materials

Details Injector for injection moulding of plastic materials Injector for injection moulding of plastic materials

2001-11-08

2003-10-28

Heitbrink, Tim (Department: 1722)

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

Molding pressure control means responsive to pressure at...

C264S040500, C264S328900, C425S564000, C425S566000

Reexamination Certificate

active

06638050

ABSTRACT:

FIELD OF THE INVENTION
This invention relates in general to injection moulding for plastic materials and, more specifically, to an injector for injection moulding of plastic materials.
Traditionally said injectors comprise a body with a passage for running hot plastic material into the mould, a pin axially movable in the body for controlling said passage and a linear actuator for controlling displacement of the pin between an advanced closed position of said passage and a retracted open position of said passage.
In injection moulding apparatuses, a fundamental control parameter is the pressure inside the mould following injection of the plastic material. Traditionally, the pressure is directly measured in the mould, by means of specific sensors or transducers applied therein. This arrangement, in addition to not being very flexible and being relatively expensive, presents the drawback of not ensuring the required pressure measuring accuracy in all conditions.
SUMMARY OF THE INVENTION
The object of this invention is to provide a new and unique solution to overcome said drawback.
According to this invention, this object is attained by a injector for plastic material injection moulding of the type above, the primary feature of which resides in that it is provided with a sensor for measuring the pressure inside the mould which is operatively associated to said pin.
According to a preferred form of embodiment of the invention, the pressure sensor is operated by the movement of the pin to said retracted position, conveniently by means of a mobile slider arranged on the extension of said pin.
Thanks to this idea, the application of pressure sensors in the injection mould is no longer necessary. Furthermore, the arrangement according to this invention of the pressure sensor allows the application to existing injectors.


REFERENCES:
patent: 5472331 (1995-12-01), Watkins
patent: 6254377 (2001-07-01), Kazmer et al.
patent: 6294122 (2001-09-01), Moss et al.
patent: 0 967 063 (1999-12-01), None
patent: 08 244 086 (1995-09-01), None

Affiliated with

Also associated with

Rating

Injector for injection moulding of plastic materials does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Injector for injection moulding of plastic materials, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Injector for injection moulding of plastic materials will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3130834