Drying and gas or vapor contact with solids – Apparatus – With apparatus using centrifugal force
Patent
1986-04-02
1989-02-14
Bennett, Henry A.
Drying and gas or vapor contact with solids
Apparatus
With apparatus using centrifugal force
34 54, 34 80, 34202, F26B 2108
Patent
active
048037877
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns a procedure to prevent the formation of moisture on tools which are heated during operation and are cooled by a circulating coolant, particularly plastic moulding machinery, together with equipment to generate a flow of dry air for use of tools which are heated during operation and are cooled by a circulating coolant, particularly those tools associated with plastic moulding machinery, for the carrying out of the procedure.
In the case of plastic spraying tools, a continuous cooling to induce a rapid setting of the plastic compound is provided generally by use of a coolant which flows through the tools. This cooling effect is usually produced by use of cold water-cooled spraying tools.
The total working cycle of a machine tool with cooled tools which are heated during operation is calculated from the total of single operations and their required time. A fundamental factor of the total working cycle is the so-called "cooling time", during which time the operationally heated tools must be cooled down. Especially for plastic spraying tools a continuous cooling to induce rapid setting of the plastic compound is generally provided by a coolant flowing through the tool. The tool temperature should be held as low as possible to achieve a short cooling time and thereby a shorter working cycle. However, the coolant should not reach too low a temperature in order to avoid the build-up of condensation on the surface of the tools. The result of water separation from condensation is the creation of a high scrap rate among items in the tools or items produced by the tools.
BRIEF SUMMARY OF THE INVENTION
The invention under consideration has the aim of creating a procedure and equipment of the type described in the foregoing to avoid the problems as described, whereby an optimal prevention of the appearance of condensation in the case of such tools can be achieved.
In accordance with the procedure according to the invention it will be proposed that a veil of dry air is created in the area of the tools by means of a current of air directed on the tools, whereby suitable dry air ducting of the same shape and size as the tools is introduced to achieve an even distribution of dry air in suitable angular positions.
In a further development of the invention it will be proposed that measuring instruments for temperature and relative humidity be introduced into the environmental area of the tools to determine the dew point temperature of the air surrounding the tools and further temperature measuring instruments on the tool surface are provided whereby, dependent on the comparable values of both instruments, datum values for the cooling water pre-cool temperature and as required, other datum values for the operation of machine tools are controlable.
Through this procedure, according to the invention, an optimal influence on the tools of a dry air current will be achieved, as a dry air current or dry air veil is available directly onto every area where the danger of the development of condensation exists. Due to the direct blowing action a corresponding changing of the air in the region of the tools is guaranteed, which is not the case in the layout arrangement of an air conditioned space around the tools. By the application of this procedure, according to the invention, the appearance of condensation in water cooled or other coolant-influenced spray tools is, for all practical purposes, ruled out. The scrap rate can be reduced to a minimum, in that at least the dampness inclusions and the smudgy surfaces originating from condensation on the tool surface can be avoided. Through the direct blowing on of the tools by a dry air veil, the coolant can be operated at a lower temperature thus producing substantially shorter working cycles of the tool-carrying machines. This leads to higher production rates and, incidentaly, also to a higher quality.
Through these measures, according to the invention, it is ensured that the surface temperature of the tools is always held minimally ab
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Modern Plastics International, Don Scibor, "How Mold Dehumidficatoy can increase Productivity", pp. 145-146, Sept. 1983.
Bennett Henry A.
Gottfried Amann & Sohn Ges.m.b.H. & Co.
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