摘要:
According to the invention, there is provided a granulator (1) including a rotary crushing blade (12) for crushing an object to be processed that has been fed into a main body (40), a stationary granulating blade (70) including a plurality of small shearing blades (72) below the rotary crushing blade (12), and a movable granulating blade (60) including a plurality of shearing blades (62) below the rotary crushing blade (12), the granulator comprising an oscillating shaft (20) pivotably supporting the movable granulating blade (60) so as to be oscillatable in directions in which the movable granulating blade (60) moves toward or away from the stationary granulating blade (70) and a driving mechanism for oscillating the oscillating shaft (20), in which the movable granulating blade (60) is detachably fixed to a movable blade holder (64) and the movable blade holder (64) is detachably fixed to the oscillating shaft (20).
摘要:
A method and apparatus for granulating previously molded solid thermoplastic material for recycling by introducing the previously molded thermoplastic material into a cylindrical granulating zone in a direction parallel with the axis of the cylinder, providing a stationary knife at a cylindrical boundary of the granulating zone, moving a second knife along the cylindrical boundary of the granulating zone to pass in proximity to the stationary knife and thereby trap portions of the previously molded thermoplastic material therebetween to cut the previously molded thermoplastic material into granules, providing an apertured surface as a portion of the cylindrical boundary and sweeping portions of the previously molded thermoplastic material along the apertured surface with the moving knife to cause cut portions of the previously molded thermoplastic material having granule size less than that of the apertures to pass therethrough for recycling by subsequent molding or other processing.
摘要:
A method of manufacturing lightweight shapes from polyimide foam in which density discontinuities such as cavities, varying cell size, or swirl marks are substantially eliminated. A block or bun of polyimide foam is prepared in a conventional manner which results in a high density rind and other discontinuities. The foam is chopped into fine flakes in a chopper with a continuous flow of air to prevent electrostatic attachment of the flakes to the chopper and ducting. The flakes are mixed with a quantity of polyimide precursor and then heated to cause the precursor to bond the flakes into a uniform mass having highly uniform and predictable density. This is a very economical process since portions of the original bun may be used which would ordinarily be discarded. An alternative method is described whereby the flakes can be bonded together by using the precursor in the form of a partially cured foam either as a binder, or by making the flakes of partially cured foam.