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Method for cooling and if necessary calibrating articles of plastic
| Details |
Inventors: Purstinger, Franz;
Assignee: C. A. Greiner & Sohne Gesellschaft mbH. (AT)
Primary Examiner: Silbaugh; Jan H.
Assistant Examiner: Staicovia; Stefan
Attorney, Agent or Firm: Alston & Bird LLP
A method for cooling and if necessary calibrating elongate articles 7 of plastic, in which the article 7, during its continuous progress has flowing round it only a gaseous cooling medium 42 at a temperature of less than 100.degree. C. at least over a portion of its outer surface and extending over a pre-determinable length of the article 7, in a plurality of flow areas 25-35' separate from one another and located one behind the other in the extrusion direction, arrow 5. |
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DETAILED DESCRIPTION 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
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Nonmetallic Processes 
