Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Production of continuous or running length
Patent
1998-08-13
2000-05-23
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Production of continuous or running length
264571, 2642094, 425 71, 425 721, 4253261, B29C 4790
Patent
active
060662883
DESCRIPTION:
BRIEF SUMMARY
SUMMARY OF THE INVENTION
The object underlying the present invention is to improve the strength properties of extruded articles with the best possible utilization of the energy outlay, or to keep to a minimum the manufacturing or operational costs of devices for cooling and if necessary calibrating such extruded articles.
The object of the present invention is in particular achieved by one embodiment of the invention in which the article, during its continuous forward progress, has only a gaseous cooling medium at a temperature of less than 100.degree. C. flowing around and/or over it in a plurality of flow areas in succession in the extrusion direction and separated from one another, and which extend at least over a portion of the outer surface of the article. Of advantage in this embodiment is that by means of the use of gaseous coolant, other volume portions of the coolant permanently come into contact with the surface of the article to be cooled, the cooling result or the cooling effect being additionally increased by the fact that the cooling medium is transported away transversely or obliquely to the extrusion direction over the article, or flows round the article. A further advantage of the use of a gaseous cooling medium resides in the fact that this can be cooled to substantially lower temperatures than for example a liquid cooling medium such as water, and thus coolant media with temperatures of below 0.degree. C. can be used. Also, the energy outlay for passing the cooling medium through the system is less in the case of a gaseous as compared to a liquid cooling medium, and a higher vacuum can be built up in the flow areas with less propulsive power. Because the coolant flows about the article in a direction obliquely or transversely to the extrusion direction of the article, on the other hand there is also achieved in an advantageous way a uniform cooling around an entire cross-section of the article, so that the articles are also capable of higher load. A surprising advantage of the present solution resides in the fact that due to the intense and rapid cooling of the article, in particular in the case of hollow profiles, the thermal activity in the inner space is decisively influenced and thus cooling of the portions of the profile lying in the inner space of the whole profile can be effected more rapidly. This rapid cooling of the inner space is also reinforced by the fact that the intensely cooled outer periphery of the profile acts as a so-called cold store and thus the heat still contained in the webs is given off or transmitted to this intensively super-cooled outer periphery. A further advantage in the use of a gaseous coolant arises from the fact that, as it passes along the article to be cooled, no residues adhering to the profile, such for example as lubricants, impurities or the like, are released or washed off, which otherwise are given off without filtering to the environment by the coolant used, such for example as water. Due to the preferably enclosed coolant circuit, stress on the environment is reliably avoided, and any impurities occurring can be separated by a filter device.
In a further embodiment of the invention, in the individual flow areas which extend in a plane vertical to the extrusion direction, the cooling medium flows round the article in a first flow area in the circumferential direction, whereafter the cooling medium is conveyed onwards into a flow area directly following in the extrusion direction, and in this the cooling medium again flows round the article in the circumferential direction. In this way, a corresponding flushing and entailed heat removal from the article to be cooled is achieved in each of the individual flow areas, and a directed further transport of the coolant is effected between the individual flow areas.
Furthermore, a procedure in which the flow direction of the gaseous cooling medium is aligned identically in flow areas directly succeeding one another is advantageous, as in all an almost helical flushing of the article by the coolant can
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C. A. Greiner & Sohne Gesellschaft mbH.
Silbaugh Jan H.
Staicovia Stefan
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