Knurled roll

The equipment feed design consisted of a funnel-shaped powder hopper (with no vacuum deaeration system) that was located directly above the rolls. The powder hopper was retrofitted with vacuum deaeration capability. A high compression feed screw, fitted inside the funnel hopper, fed the powder directly into knurled rolls. The compaction trials were conducted with and without vacuum deaeration. The compact was carefully collected directly on a 10-mesh screen. Powder particles, that were not compacted (i.e., those particles which were not attached to the compact, for example, fines bypassing roll compaction and the non-adhering compacted powder particles) were weighed and separated. The compact was not milled. The parameters are noted in Table 4. 

Strip Packs. Usually two laminates of paper and/or soft temper aluminum and various plastics have been used as clear cellophane (i.e., coated rather than a laminate). This process uses two rolls of either laminate or film which at the point of coming together have the product (usually tablet or capsule) placed between the rolls and heat sealed inside the rolls by means of a hot knurled roller, thereby welding the inside layers of the laminate together. The essential point of this method is that the product itself helps to form the pocket. The number of packed tablets or capsules required is then cut off the strip. 

Can incorporate other forming processes, for example knurling, thread rolling and bending to produce complex parts at one machine. 

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