초록 ▼

In an apparatus for producing particles of thermoplastic material by extruding material in a plastic state through orifices in a die plate and thereafter cutting the extruded plastic material into crumb upon exit from the orifices, an air supply is coupled to a cutting chamber for providing a stream

In an apparatus for producing particles of thermoplastic material by extruding material in a plastic state through orifices in a die plate and thereafter cutting the extruded plastic material into crumb upon exit from the orifices, an air supply is coupled to a cutting chamber for providing a stream of air across the face of the die plate to cut and convey the crumb away from the orifices. The cutting chamber is arranged to include a restricted throat having an exit area in close proximity to the orifices and a further portion for providing an accumulation zone adjacent the orifices, the accumulation zone having a cross-sectional area which increases from the exit area of the throat to a product discharge zone remote from the orifices in a downstream direction.

대표청구항 ▼

Apparatus for producing particles of thermoplastic material comprising: an extrusion device including a multi-orifice die plate having a face from which extruded material extends; a cutting chamber; a source of gas coupled to said cutting chamber; a restricted throat means interposed between said so

Apparatus for producing particles of thermoplastic material comprising: an extrusion device including a multi-orifice die plate having a face from which extruded material extends; a cutting chamber; a source of gas coupled to said cutting chamber; a restricted throat means interposed between said source of gas and said face of said die plate for causing said gas to pass across said die plate at a velocity sufficient to sever extruded material to form crumb particles; a sloping wall member within said cutting chamber extending from said restricted throat means towards a material discharge region of said chamber for forming a product accumulation region in the vicinity of said orifices having an increasing cross-sectional area proceeding from said throat means towards the ones of said orifices nearest to said discharge region.