 Buckle joint |
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| Elastomeric materials reinforced with small diameter glass fibers |
| AND PREFERRED EMBODIMENTS The gist of the present invention lies in the discovery that very fine ... |
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| Bipolar separator for electrochemical cells and method of preparation thereof |
| We claim: 1. A bipolar separator for electrochemical cells which separates the adjacent anolyte and ... |
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| Flexible sheet molding compound and method of making the same |
| OF THE PREFERRED EMBODIMENT "Flexibility modifying agent", as used herein, refers to an additive ... |
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| Conductive gray in-mold coating |
| OF THE INVENTION The thermosetting coating compositions of the present invention are based upon a ... |
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| Process for thickening thermoset resin molding compound compositions |
| This invention relates to a process for making a thickened thermoset resin composition comprising, ... |
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| Low pressure sheet molding compounds |
| This invention relates to low pressure sheet molding compounds and, more particularly, to a ... |
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| Metal passivation for anode grade petroleum coke |
| OF THE INVENTION The present invention provides a method for producing petroleum coke suitable for ... |
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| Bipolar battery cells, batteries and methods |
| OF THE ILLUSTRATED EMBODIMENTS General The two most difficult aspects of bipolar battery ... |
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| Process for preparing a membrane/electrode assembly |
| OF THE INVENTION The term "catalytically-active particles" as used herein refers to particles of a ... |
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Extruder apparatus and process for compounding thermoplastic resin and fibres
| Details |
Inventors: Hawley, Ronald C.;
Assignee: Composite Products, Inc. (Winona, MN)
Primary Examiner: Woo; Jay H.
Assistant Examiner: Mackey; James P.
Attorney, Agent or Firm: Moore & Hansen
Multiple extruder apparatus for compounding thermoplastic resin and reinforcing fibers incorporates a resin extruder in which thermoplastic resin pellets are melted and a compounding extruder in which the molten thermoplastic resin is mixed in intimate contact with long reinforcing fibers of at least one inch in length. The melted thermoplastic resin is introduced into the compounding extruder at a point downstream of the inlet point for the reinforcing fibers, so that the fibers are mechanically worked and heated before coming into contact with heated, molten thermoplastic resin. The extrudate from the compounding extruder consists of a homogeneous, molten mass of thermoplastic resin having discrete lengths of fibers randomly dispersed therein. |
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DETAILED DESCRIPTION This invention has as its primary objective the compounding of thermoplastic resin with reinforcing fibers in a multiple extruder system in such a way as to produce measured preforms of a predetermined size and shape consisting of discontinuous lengths of reinforcing fibers randomly dispersed in thermoplastic resin.
A further objective is to provide a blended mixture of thermoplastic resin with reinforcing fibers wherein the structural integrity of the discrete fibers is maintained in lengths preferably of one inch or more.
These basic objectives are realized by utilizing two separate extruders comprising a first, resin extruder and a second, compounding extruder.
Discrete, predetermined lengths of reinforcing fibers are introduced into a first inlet port of the compounding extruder from a suitable source of supply.
Thermoplastic resin pellets introduced into the resin extruder by pellet-handling apparatus are heated and melted therein, and forced under pressure into a second inlet port of the compounding extruder.
The action of the power screw of the compounding extruder produces as an extrudate a molten mass of thermoplastic resin having discrete, discontinuous lengths of reinforcing fibers randomly dispersed therein.
As a particularly advantageous feature, the aforesaid second inlet port on the compounding extruder for receiving heated, thermoplastic resin is located along the length of the power screw of the compounding extruder at a location downstream from the first inlet port, into which the reinforcing fibers are introduced, with respect to the direction of fiber and resin flow through the compounding extruder.
As a result, the fibers will be heated and mechanically worked by the power screw of the compounding extruder before coming into mixing contact with the molten, thermoplastic resin.
This enhances the penetration and coating of the fibers by the thermoplastic resin and reduces fiber degradation at the moment of contact, which would otherwise occur if the thermoplastic resin were in a more viscous state
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Nonmetallic Processes 
