Method of extrusion molding and apparatus therefor

Details Method of extrusion molding and apparatus therefor Method of extrusion molding and apparatus therefor

B - Operations, Transporting

29

C

B29C 47/08 (2006.01) B29C 47/00 (2006.01) B29C 47/12 (2006.01) B29C 47/16 (2006.01) B29C 47/20 (2006.01)

Patent

CA 2049285

2049285 9110552 PCTABS00006 A method of extrusion molding, wherein the fluidity of a molding material in a die is kept satisfactory and the productivity of molded items having a uniform thickness is greatly improved, and an apparatus therefor capable of carrying out the method with reasonable construction of the apparatus. Molding is carried out while the die provided with an extrusion opening gap adjusting means is resonated. Furthermore, preferably, to make smooth the flow of the molding material in the vicinity of an extrusion opening of the die where the flow is most likely to stagnate in general, the extrusion opening gap adjusting means is attached to a part of the die, which forms an extrusion opening portion, whereby molding is carried out while only this part of the die is resonated. As a preferable mode, to attain effective resonance, the resonance frequency of the extrusion opening gap adjusting means is made equal to the resonance frequency of the die, and the extrusion opening gap adjusting means is attached to a nodal portion of the resonance. Furthermore, the extrusion opening of the die is allowed to coincide with the loop portion of resonance, i.e. a portion where the effect of vibrations is the strongest, so that the frictional resistance between the molding material and the surface in the vicinity of the extrusion opening of the die is reduced.

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