초록 ▼

Apparatus and methods for mixing fluffy scrap and rigid plastics materials for subsequent discharge of the mixture to an extruder comprises an upright mixing chamber to which rigid, fluent plastics pellets are fed by gravity and into which fluffy, ground scrap plastics material is fed by positive dr

Apparatus and methods for mixing fluffy scrap and rigid plastics materials for subsequent discharge of the mixture to an extruder comprises an upright mixing chamber to which rigid, fluent plastics pellets are fed by gravity and into which fluffy, ground scrap plastics material is fed by positive drive means from a hopper. Delivery of an adequate quantity of scrap material to the mixing chamber is assured by the provision in the scrap hopper of an agitating mechanism which is interposed between the top and the bottom of the hopper and which is operable to permit scrap material to pass downwardly to the bottom of the hopper for engagement by a feeding auger, but which prevents subjecting such scrap material to the weight of additional scrap in the hopper, thereby preventing bridging of the scrap at the lower end of the hopper. Feeding of the base and scrap materials from the mixing chamber to the extruder is achieved by a rotary auger having an interrupted vane which provides for alternate compaction and expansion of the scrap material with consequent facilitation of the entry of base material to the mixing chamber.

대표청구항 ▼

In apparatus for blending fluffy scrap material and fluent rigid base material for subsequent discharge to an extruder or the like and wherein said apparatus comprises an upright mixing chamber having an outlet at its lower end, first conduit means in communication with said chamber at a level above

In apparatus for blending fluffy scrap material and fluent rigid base material for subsequent discharge to an extruder or the like and wherein said apparatus comprises an upright mixing chamber having an outlet at its lower end, first conduit means in communication with said chamber at a level above that of said lower end for delivering scrap material into said chamber, and second conduit means in communication with said chamber above the level of said lower end for delivering by gravity base material into said chamber, the improvement comprising positive drive means in said first conduit means for driving scrap material therethrough into said chamber in such quantity as to restrict the quantity of base material that may enter said chamber; feeding means in said mixing chamber for feeding scrap and base materials downwardly therefrom through said outlet and into an extruder or the like; and means for driving said feeding means.