Plastic article or earthenware shaping or treating: apparatus – Female mold and means to shape parison directly by internal... – Including means to prepare parison
Patent
1997-11-24
1999-02-23
Davis, Robert
Plastic article or earthenware shaping or treating: apparatus
Female mold and means to shape parison directly by internal...
Including means to prepare parison
425533, 425534, 425541, B29C 4906, B29C 4956
Patent
active
058741151
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention refers to an injection moulding machine including an injection moulding tool which comprises at least one female die and one male die.
BACKGROUND OF THE INVENTION
Such machines are, of course, known in the prior art to a large extent and they are used in great variety of cases. Such injection moulding machines are often also used for producing preforms which are subsequently subjected to a blowing process. In the production of large-volume beverage bottles of plastic material, for example, it is known to produce a preform in an injection moulding machine and to let said preform cool down so that it can then be given its final shape after an appropriate thermal pretreatment directly at the beverage-manufacturing firm. In this connection there are, however, also solutions in the case of which the preform is removed from the injection moulding machine and supplied to a conveyor means passing with said preform a large number of intermediate processing steps, such as e.g. crystallization of the thread area for the screw top. Finally, a heat treatment step is carried out prior to the actual blowing process. These processes known in the prior art have the great disadvantage that they are specially adapted to the production of beverage bottles and that this type of device has not gained general acceptance for producing other injection-moulded/blow-moulded parts.
SUMMARY OF THE INVENTION
It is therefore the object of the present invention to provide an injection moulding machine that can be used in a greater variety of cases.
According to the present invention, this object is achieved by the features that a blow moulding tool is arranged in closely spaced relationship with said injection moulding tool, and that a transfer member is arranged between said injection moulding tool and said blow moulding tool, said transfer member being used for transferring a preform from said injection moulding tool to said blow moulding tool and the movement of said transfer member being synchronized with the opening and closing movements of said injection moulding tool and of said blow moulding tool in such a way that said transfer member moves into the tool area of the open injection moulding tool, removes the respective preform from the male die or from the female die, moves out of said tool area and introduces the preform into the blow moulding tool that is open to an adequate extent.
It is true that the topic of integrating a blow moulding tool in an injection moulding machine has already been dealt with in DE-pat. 3 811 465, but in the case of this known device the injection moulding tool and the blow moulding tool are arragned one after the other in an in-line arrangement and they have a common, rotatable male die, the preforms produced in the injection moulding tool remaining on the mould cores of the male die and being transferred to the blow moulding station by rotating the whole male die. The device has the adavantage that, due to the short distances provided, cooling down of the preform is prevented to a very large extent. In comparison with the present invention, said device is, however, disadvantageous insofar as twice the number of cores is required on a male die having a complicated structural design. A further advantage of the present invention is to be seen in the circumstance that, on the basis of the transfer member provided in the case of the present invention, the masses which have to be moved are only small in comparison with a rotatable male die, whereby higher operating speeds are possible and energy can be saved. In addition, the device according to the present invention permits a comparatively uncomplicated tool change. Due to the fact that the structural designs of the injection moulding tool and of the blow moulding tool are kept simple, small overall heights of the tools are achieved, a stacked mode of arrangement being also imaginable in this connection. In the case of the present invention it is, in this respect, of essential importance that the injection mo
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Davis Robert
Systec Engineering Knauer GmbH & Co. KG
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