Method of operating the closing means of a double plate injectio

Details Method of operating the closing means of a double plate injectio Method of operating the closing means of a double plate injectio

1995-02-16

1997-08-26

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

264349, 425590, 425595, B29C 4567

Patent

active

056607830

ABSTRACT:
In order to operate the closing means of a double plate injection moulding machine including a fixed and a movable mould plate, the closing means comprising at least one pump (22), at least one high speed cylinder for a high speed stroke and at least one closing cylinder (10) for a closing stroke with a nominal closing force, whereby the closing cylinder (10) includes a double action piston (7) in which both piston faces (13, 14) are the same size and which divides the interior of the closing cylinder (6) into two cylinder sections (8, 9) which are hydraulically connectable via hydraulic lines (21, 22) and a valve (26), the following method is carried out: during the high speed closing operation using the high speed cylinder (3), both sides of the piston (7) of the closing cylinder (10) are pressurized with an equal, high pressure which is as high as or higher than that required to obtain the required nominal closing force, whereby on moving the piston (7) of the closing cylinder (10) in the closing direction (15), the valve (26) allows the pressure between the two cylinder sections (8, 9) to be equalized, and in that the power closing operation is effected by releasing hydraulic oil from the cylinder section (9) of the closing cylinder (10) in which the hydraulic pressure causes a force which acts on the movable mould plate in the direction opposite to the closing direction (15), the valve preventing the pressure between the two cylinder sections (8, 9) from being equalized.

REFERENCES:
patent: Re30934 (1982-05-01), Hehl
patent: 3327474 (1967-06-01), Schiffer
patent: 3663140 (1972-05-01), Hehl
patent: 3786725 (1974-01-01), Aoki
patent: 3935791 (1976-02-01), Hehl
patent: 4861259 (1989-08-01), Takada
patent: 4925618 (1990-05-01), Takada
patent: 4992036 (1991-02-01), Herdtner et al.
patent: 5422060 (1995-06-01), Nakamura

Affiliated with

Also associated with

Rating

Method of operating the closing means of a double plate injectio does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of operating the closing means of a double plate injectio, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of operating the closing means of a double plate injectio will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1986080