Method and apparatus for lubricating molding tools
First Claim
1. In a method of preparing tablets from a granulate material comprising introducing granulate material into a mold die cavity, compressing the granulate material in the mold die cavity with a cooperating punch to form tablets, and ejecting the tablets from the mold die cavity,the improvement which comprises forming a lubricant film over substantially the entire mating surfaces of the mold die cavity and cooperating punch by selectively dotting liquid or suspended lubricant in specific quantities and in the form of discrete droplets by piezoelectric means onto a small portion of said mating surfaces to provide complete lubrication of the mating surfaces.
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Accused Products
Abstract
A method and apparatus for the coating of molding tools which comprises dispersing liquid or suspended lubricant in directional manner before each pressing operation in discrete, specific droplets onto the pressing zones of the molding tools, said dispersing being effected by means of f.i. piezoelectric transducers.
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Citations
11 Claims
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1. In a method of preparing tablets from a granulate material comprising introducing granulate material into a mold die cavity, compressing the granulate material in the mold die cavity with a cooperating punch to form tablets, and ejecting the tablets from the mold die cavity,
the improvement which comprises forming a lubricant film over substantially the entire mating surfaces of the mold die cavity and cooperating punch by selectively dotting liquid or suspended lubricant in specific quantities and in the form of discrete droplets by piezoelectric means onto a small portion of said mating surfaces to provide complete lubrication of the mating surfaces.
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6. In an apparatus for preparing tablets from a granulate material comprising means for introducing granulate material into a mold die cavity, means for compressing the granulate material in the mold die cavity with a cooperating punch to form tablets, and means for ejecting the tablets from the mold die cavity,
the improvement which comprises piezoelectric means for forming a lubricant film over substantially the entire mating surfaces of the mold die cavity and cooperating punch by selectively dotting liquid or suspended lubricant in specific quantities and in the form of discrete droplets onto a small portion of said mating surfaces to provide complete lubrication of the mating surfaces.
Specification