Process and a device for producing plastic cups by injection mou

Details Process and a device for producing plastic cups by injection mou Process and a device for producing plastic cups by injection mou

1994-08-15

1996-05-28

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

264516, 264334, 4251261, 425444, B29C 4514, B29C 4542

Patent

active

055208762

DESCRIPTION:

BRIEF SUMMARY
The present invention refers to an injection moulding process for producing a plastic cup having a label-shaped enveloping sheet integrated in said plastic cup according to the inmould-labelling method, said process comprising the following steps: inserting said enveloping sheet into a female mould for a subsequent injection moulding process; from each other to an opening position, a controlled positioning arm displacing, in the course of this opening movement, the suction holding mandrel to a position where it extends coaxially with the male mould and the female mould in an interspace evolving between the male mould and the female mould when said male and female moulds are moved apart; female mould and inserting it therein; a closed injection mould is reestablished, the controlled positioning arm removing, due to said closing movement, the suction holding mandrel from the interspace which is defined between the male mould and the female mould and which disappears as a result of said closing movement;
The present invention additionally refers to an injection moulding device used for carrying out the injection moulding process mentioned hereinbefore and comprising a male mould and a female mould which is adapted to be moved coaxially so as to cover the male mould for defining a closed injection mould; an injection nozzle used for injecting molten plastic into the closed injection mould; a positioning arm carrying a suction holding mandrel, said suction holding mandrel being provided with an insertion member which is adapted to insert the enveloping sheet into the female mould, said female mould and said insertion member being each provided with a holding means which is adapted to hold the enveloping sheet in position; a drive means which is adapted to move the male mould and the female mould towards and away from each other; a drive means provided with control means for moving the positioning arm into and out of an interspace by controlled movements, said interspace evolving and disappearing when the female mould and the male mould are moved away from each other and towards each other, respectively.
The inmould-labelling method, which is already known, is used for plastic cups of all kinds, e.g. for yoghurt cups, the enveloping sheet, which is inserted into the injection mould before the molten plastic is filled in, being preferably fabricated from the same plastic material or from a similar plastic material as the molten plastic and fusing during the injection moulding process with the molten plastic injected into the injection mould so that, in the finished plastic cup, the enveloping sheet will form an integral constituent part of the wall of the cup.
The inmould-labelling method has the special advantage that enveloping sheets, which are labels of high printing quality, can be integrated in the plastic cup in a simple manner. When the labels are printed on an otherwise finished plastic cup, it is impossible, not least in view of the three-dimensional configuration of the cup, to realize such a printing quality by means of the printing processes available.
An essential problem arising in connection with the inmould-labelling method is the insertion of an enveloping sheet in the female mould for the subsequent injection moulding process. This insertion process has to be carried out such that, on the one hand, it will consume as little time as possible and that, on the other hand, it is performed with sufficient accuracy so that the enveloping sheet will be inserted into the female mould at the desired position. For this purpose, it is necessary to realize for the injection moulding device a structural design which is as simple as possible and in which correspondingly simple sequences of motions take place so that a troublefree production sequence with a short cycle time can be realized.
EP-A-0 415 153 A2 discloses an insertion device for the enveloping sheet in the case of which a suction holding mandrel enters a female mould together with a previously picked-up enveloping sheet and transfers, by blowing

REFERENCES:
patent: 3869234 (1975-03-01), Sutch
patent: 4335635 (1982-06-01), Hautemont
patent: 4368018 (1983-01-01), Rees et al.
patent: 4865793 (1989-09-01), Suzuki et al.

Affiliated with

Also associated with

Rating

Process and a device for producing plastic cups by injection mou does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process and a device for producing plastic cups by injection mou, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process and a device for producing plastic cups by injection mou will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-784644