Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – Forming continuous work followed by cutting
Patent
1991-04-22
1993-08-31
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
With severing, removing material from preform mechanically,...
Forming continuous work followed by cutting
264167, 26417711, 26417712, 2642092, 2642098, 26421111, 26421112, 425142, 425308, 425381, 425150, 425465, 425466, B29C 4718
Patent
active
052406636
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method apparatus for producing a member from extrudable material, and to members produced by the method.
Extruder plants are used to produce members from extrudable or continuously castable material, for example ceramic or synthetic plastic material, etc. The molded members are, in the case of ceramics, also fired or baked to preserve the final shape and strength of the ceramic material of the articles. In chemical processing, for example catalysis, extruded members with a parallel duct structure are termed monoliths.
These are produced in extruder plants in which the ducts in an extruder nozzle do not change position relative to one another.
Plants using known methods can in fact produce members with duct structures which are, for example, twisted spirally, but the relative positions of the ducts to one another remain the same. All the ducts, however, always adjoin the same ducts, so that the variety of member structures available is very limited. DE-OS 25 27 787 also discloses honeycomb extruded parts having a large number of narrow closed passage ducts which may also partly not run parallel. Here again, there cannot be any exchange between the individual closed ducts. For many applications, however, members with mutually crossing and open ducts are necessary or advantageous wherever the medium carried, for example a gas, a liquid, a free-flowing solid or a mixture, is to be mixed as thoroughly as possible or homogenised and at the same time directed outwards from the interior of the member, for example in order to heat or cool the flowing medium on the outside walls of a column and, in particular, for optimal uniform and complete progress of the required reactions, mass transfer and changes of state in chemical reaction columns, mixers and catalyst systems. In such cases it is necessary for the entire contents of all the ducts to be completely and uniformly continually re-mixed over the entire crosssection of a member. This, however, is generally impossible with closed ducts of arbitrary shape.
Member structures with e.g. mutually crossing ducts have previously been made by subsequently assembling a plurality of, for example, extruded parts made from ceramic or plastic material. The additional operation of subsequent connection and e.g. bonding or re-baking of the connection points, alone, demands considerable effort or expense. In addition, the connection points may be mechanically and/or chemically weak (corrosion).
Accordingly, it is an object of the invention to create an extruder method which can produce members with duct structures having mutually crossing open ducts by extrusion and which does not require subsequent assembly and connection of the layers or plies of the structure with the ducts.
It is another object of the invention to provide a relatively simple apparatus for producing a multi-layer member with mutually crossing ducts.
It is another object of the invention to provide an extruder nozzle for making members extruded with crossing ducts.
It is another object of the invention to perform a multilayer member with crossing ducts in a single extrusion operation.
Briefly, the invention provides an extrusion apparatus comprising a barrel for movement of a flowable mass therethrough and a nozzle at one end of the barrel for extrusion of the flowable mass therethrough wherein the nozzle has at least three segments disposed in contact with each other and with each section having a plurality of extrusion ducts in communication with the barrel in order to extrude streams of the flowable mass therethrough. In addition, a drive means is provided for moving at least one of the nozzle segments relative to the other nozzle segments during extrusion of the streams of flowable mass through the extrusion ducts.
The extrusion apparatus also includes a control unit for actuating the drive means and a cutting device disposed adjacent an outlet end of the nozzle for cutting an extruded mass passing therefrom. The cutting device may also be connected to the control unit for actuati
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Pfeiffer Alex
Stringaro Jean-Paul
Sulzer Brothers Limited
Thurlow Jeffery
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