FI57710B - SAFETY RELEASE PLATE PROCESSING PLASTIC PRODUCT SAOSOM PLASTROER GENOM STRAENGSPRUTNING - Google Patents

Description

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Ptatmt- och ruglfterutyrvluun '' amMcm utitgd och utukrifwn pubiicund 30.06.80 (32) (33) (31) Pyydutty utuolkuut — Bugkrd priorities (71) Rakennusmuovi Oy, Ravitie 3, 15860 Salpakangas, Finland-Finland (FI) (72) Kyö Sm & tt, Lahti, Finland-Finland (Fl) (7 * 0 Oy Heinänen Ab (5l) Apparatus for the production of elongated plastic products, such as plastic pipes, by extrusion - Anordning för framställning av läng-sträckta plastprodukter, s & som plaströr genom strängsprutning such as for the production of plastic pipes by extrusion, the apparatus comprising two production lines, each consisting of a nozzle head and a plastic machine for plasticizing plastic, which can be connected so that the plastic machine of each line is connected to the same nozzle end.

The conventional method of manufacturing extruded plastic products is that each product has its own production line. Because sales of different products are usually different, some lines then have to stand idle for part of the time. This is a major drawback, as considerable capital is involved in each production line, and in particular in the plastic machine belonging to it.

In some known installations, the nozzle head belonging to the production line is interchangeable, so that the same line can be used for the production of various 2 57710 plastic products. However, changing the nozzle head is cumbersome and time consuming and the production line has to be inactive during this time. On the other hand, e.g. DE patent publication 2,055,340 discloses an apparatus in which the production of different plastic products by means of the same plastic machine is solved by arranging the plastic machine to be pivotable.

DE patent publication 99 997 further discloses an apparatus in which parallel production lines can be connected to each other so that the plastic machine of both lines is connected to the same nozzle end. The connection takes place using a special connecting pipe and the purpose is to increase the compression power. 3If you want to use this equipment to make various plastic products, it requires a time-consuming replacement of the nozzle head.

The object of the present invention is to eliminate the above-mentioned drawbacks and to provide a solution in which larger plastic products are obtained by connecting production lines. The invention is characterized in that the apparatus comprises, in addition to said nozzle heads belonging to the production lines, a third, larger nozzle head located between the production lines, and that the plastic machines belonging to the production lines can be pivoted towards and connected to said larger nozzle head. The invention thus achieves that the combined power of the plastic machines belonging to the production lines can be used for the production of a larger plastic product without having to undertake a time-consuming change of nozzle at the end of the production line.

The invention will now be described in more detail by way of example with reference to the accompanying drawing, which shows a top view of an apparatus according to the invention.

The apparatus shown in the drawing comprises two parallel production lines for extruded plastic products, each comprising a plastic machine 1,2 and a nozzle head 3,4. Each plastic machine 1,2 has a raw plastic feed hopper 5 and a housing 6 with a feed screw inside. Inside the plastic machine, the raw plastic is heated into a plastic space and pressed by means of a feed screw into the nozzle head, from which the product is continuously discharged. The production lines further include extruded product post-processing devices, which, however, are irrelevant to the invention and are therefore not shown.

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The apparatus according to the drawing further comprises a third nozzle head 7 mounted between said parallel production lines and larger in size than the nozzle heads 3 and 4 belonging to the production lines. The plastic machines 1 and 2 are mounted on vertical shafts so that they can be pivoted towards and connected to the nozzle head 7. To facilitate turning, the housings 6 of the plastic machines are supported on circular guides Θ.

Since the nozzle heads 3, 4 and 7 included in the apparatus according to the drawing are of different sizes, three plastic products with different cross-sections can be manufactured with the apparatus. In the manufacture of two products with a smaller cross-section, plastic machines are connected to the nozzle heads 3 and 4, which is shown in the drawing by dotted lines. When making the product with the largest cross-section, the plastic machines are turned towards the middle nozzle head 7 and connected to it. The plastic machines connected to the nozzle head 7 are shown in the drawing in solid lines.

It will be apparent to those skilled in the art that various embodiments of the invention may vary within the scope of the appended claims. Thus, for example, the invention is not tied to any particular internal structure of plastic machines and nozzle heads.