Plastic and nonmetallic article shaping or treating: processes – With step of cleaning – polishing – or preconditioning...
Patent
1990-08-16
1991-10-01
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
With step of cleaning, polishing, or preconditioning...
264241, 2642972, 2642978, 26432811, 26432816, 425117, 4251291, 425225, 425547, 425575, 425588, 425357, B29C 4504
Patent
active
050531735
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a process and apparatus for manufacturing mouldings of plastic material, in which the plastic material is introduced by a dispensing device into a mould cavity of a tool comprising a basic part and several mobile parts and is retained in the mould cavity until adequate stability of shape is attained, whereupon the moulding is ejected.
2. Description of the Prior Art
In a known method and a device suitable for carrying out the latter in accordance with DE-B-11 45 786, for the manufacturing of plastic parts, there are associated with a basic part of the tool several mobile tool parts which are fixedly arranged on a rotatable table plate. The table plate is turned gradually, so that the mobile tool parts are connected successively with the basic tool part and plastic material can be injected into the corresponding mould cavities. It is a disadvantage that in this method and the known device, the cycle time on even the mobile tool parts at a distance from the basic tool part is dependent on the cycle time for the manufacture of the moulding.
It is already known to use so-called mould carousels for the purpose of manufacturing plastic moulding which require a longer cycle time between the introduction of the liquid plastic material into the mould cavity and the removal of the moulding. The carousels usually comprise a turntable on which a plurality of moulds are disposed one behind the other around the periphery thereof at equal angular distances apart. The mould located opposite the dispensing device is filled with plastic material, whereupon the turntable is rotated through a further angular spacing, so that the next mould may be filled with liquid plastic material. In the meantime, the mould is opened in the region of the other moulders, the moulding is removed, and the mould cavity is cleaned and recoated with a parting agent. Processes and installations of this kind are widely used, although the costs of manufacturing a large number of complete moulds is relatively high, and the spatial requirements are also relatively high if several working operations are to be performed in succession.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a process and an apparatus for the manufacture of mouldings from plastic material, which process and installation meet requirements with a short injection time for the individual moulding and with a low closing pressure. Furthermore, universal use of the process and the apparatus is to be made possible even in the case of small mouldings with a short injection time. Moreover, the work required between the individual injection operations is to be capable of being performed so as to be unrestricted, as far as possible, by the station time of the actual injection operation.
This object of the invention is solved in that the mobile parts of the tool are movable independently of each other along a lateral and/or vertical guideway of a conveyor and are brought in succession into the working region of the basic part of the tool and at least therein are connected with a cooling and/or heating circuit and the tool parts are joined together into a closed mould cavity, whereupon the plastic material is introduced into the mould cavity, and that the basic part of the tool and the mobile part of the tool are separated from one another after a reaction time has elapsed, and the mobile part of the tool together with the moulding, independently of the other mobile parts of the tool, is subjected to a further treatment, and a following mobile part of the tool with an empty mould cavity is connected to the basic part of the tool, and plastic material is introduced into the empty mould cavity. The advantages of this unexpectedly simple solution reside in the fact that only one of numerous tool parts of the same construction is required at any one time, while the other part of the tool is only present in the region of the dispensing device. However, the duplication of the other part of t
REFERENCES:
patent: 3754848 (1973-08-01), Choate
patent: 3973891 (1976-08-01), Yamada
patent: 3982869 (1976-09-01), Eggers
patent: 4555228 (1985-11-01), Nishiike
patent: 4861258 (1989-08-01), Margiaria et al.
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