An extrusion device that produces plastic film includes at least two feed units that feed feedstock for an extruder, wherein, in each feed unit an automatic cleaning device is arranged for a removal of feedstock from the feed unit when changing material in the extrusion device.

An extruder arrangement and a method of feeding feed material into an extruder. The abstract of the disclosure is submitted herewith as required by 37 C.F.R. 1.72(b). As stated in 37 C.F.R. 1.72(b): A brief abstract of the technical disclosure in the specification must commence on a separate sheet, preferably following the claims, under the heading Abstract of the Disclosure. The purpose of the abstract is to enable the Patent and Trademark Office and the public generally to determine quickly from a cursory inspection the nature and gist of the technical disclosure. The abstract shall not be used for interpreting the scope of the claims. Therefore, any statements made relating to the abstract are not intended to limit the claims in any manner and should not be interpreted as limiting the claims in any manner.

An apparatus for feeding a screw-type extruder with material strips made of rubber mixtures or plastics mixtures, which strips are arranged in a folded zig-zag shape and can be supplied by means of at least one conveyor belt to a supply region of a supply element that is funnel-shaped, at least in portions, and an extruder. A motor-driven conveyor device for the material strip is arranged within the supply region, which device comprises a pressure surface that can abut the surface of the material strip and can be moved in a reversing manner. Said pressure surface only abuts the surface of the material strip in the conveying direction and, in the direction opposite the conveying direction, it adopts a return position in which it is spaced from the surface of the material strip.

A processing installation for the processing of bulk material has a vacuum filter insert for degassing of the bulk material. The vacuum filter insert is arranged in a casing of a screw machine downstream of the feed opening thereof and is provided with at least one filter element so that the vacuum filter insert forms a gas-permeable wall portion which defines the at least one casing bore of the screw machine. Seen in a degassing direction, a protective element comprising a plurality of through-openings is arranged upstream of the at least one filter element. The protective element acts as a granule protection for the at least one filter element and prevents granular bulk material from damaging the at least one filter element. As a result, the vacuum filter insert has a longer service life, thus ensuring a long operating time for the processing installation without interruptions.

Novel extruded ceiling fan blades, compositions and methods of making the blades from plastic material such as polystyrene are disclosed. The blades can be formed from two extruders so that different colors and/or finishes, such as wood grain looks can be formed on the upper and lower surfaces of the blades.

A feeding device for feeding fluff and granules into an extruder includes a supplying apparatus with an outlet-side pipe piece for the granules, with which the granules can be fed while forming a granule column, the pipe piece being connected to an inlet opening of the extruder, a funnel with a funnel outlet for supplying fluff, an auger being provided within the funnel for conveying fluff, which projects through the funnel outlet and into the pipe piece, the fluff being conveyable within the granule column, and the auger being configured to be a double-start and so as to also convey parts of the granules and/or to compact the fluff with a compacting device.