Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With means to heat or cool
Patent
1997-05-06
2000-06-27
Heitbrink, Tim
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With means to heat or cool
425570, 425572, B29C 4522
Patent
active
060799714
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to an injection assembly for a plastics material injection mould, and for a process for producing an assembly of this type.
More particularly, the invention relates to an injection assembly for a plastics material injection mould, comprising: nozzle, from the barrel extruder; nozzles; injection mould.
At present, for the injection of large-scale parts in plastics material, for example those intended for the automobile industry, the injection mould is equipped with an injection assembly comprising heating nozzles to allow the plastics material to be injected, simultaneously, at different locations on the mould in order to ensure a rapid and very uniform distribution of the plastics material inside the mould, a condition which is indispensable for the manufacture of large-scale parts with good mechanical and aesthetic properties.
This injection assembly is currently produced by machining a forged steel block, in which there are provided passages for accommodating the nozzles, the supply ducts of the nozzles and the ducts for supplying the control fluid for the nozzle valves, for heat-exchanging fluid, or for electric supply cables to pass through.
These machining operations are extremely long because it is necessary to remove a significant part of the material; these operations are also very delicate and the injection assembly is not always satisfactory as regards the distribution of heat, the uniformity of the temperature inside the assembly, etc.
SUMMARY OF THE INVENTION
The object of the present invention is to rectify these drawbacks and it proposes the creation of an injection assembly which can be produced in a particularly simple and efficacious manner, allowing a perfect adaptation to any arrangement of injection nozzles, ie. to any shape of part to be injected, controlling the problems of regularity of the temperature and allowing, in a general manner, injected products of excellent quality to be produced.
To this end, the invention relates to an injection assembly of the type defined hereinabove, characterized in that it comprises: nozzles; reinforcing ribs and a reserved space for accommodating the heating distributor, and positioning supports for the heating distributor; connected to at least one plastics material input point (central nozzle) and to injection nozzles comprising; vicinity of which the heating distributor is supported on the bearing plate; connector of the central nozzle.
The injection assembly according to the invention has multiple advantages both as regards the design and the manufacture and as regards the application. Since the injection assembly is formed of two separate parts, its design is particularly flexible and simple to produce, the more so since these parts are made of cast iron or moulded steel.
The machining, ie. the time which is necessary for forming these two parts, is extremely reduced since the work on the machine is limited to the machining of the reference faces, supporting faces, and centerings for the nozzles.
This reduction of time is considerable in relation to the machining time for the injection assembly according to the prior art, the more so when large scale parts are involved.
The assembly according to the invention is much lighter than that of the prior art, with the result that the time taken to increase the temperature is reduced in the same proportions.
The heat insulation between the heated part of the assembly, ie. the heating distributer and the nozzles, limits the waste of heat and facilitates the control of the temperature of these parts which are directly in contact with the plastics material the temperature of which is to be maintained.
The breakdown of the distributer into single, absolutely necessary functional parts: the connectors for the support of the nozzles and the branches forming the ducts and constituting the support of the connectors and also of the nozzles, results in a part which is to heated and regulated and is of very low mass which permits a significant improvem
REFERENCES:
patent: 4832254 (1989-05-01), Peuke et al.
patent: 5096411 (1992-03-01), Gellert
patent: 5227179 (1993-07-01), Benenati
patent: 5346388 (1994-09-01), Gellert
G. Bagusche, Kunststoffe, vol. 85, No. 2, Feb. 1995, p. 176.
Heitbrink Tim
L.M.R.
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