polymer processing

CAD - Computer Aided Design. Use of computer to draw/design parts. Cap - Closure Capacity - The rated amount of volume (# parts) produced by a mold/molding machine per year. Capper - Machine that applies a closure to a bottle on a packing line. Cavitation - The number of molding stations within a mold. Cavity - Mold component(s) which form the exterior or external surfaces of a part. Centerline - A line drawn down on part drawing that represents the geometrical center of the part in that axis. Charge - The amount of material volume or weight required for the injection unit to plasticize for each molding cycle. Chemical resistance - Ability of a material to retain utility and appearance following contact with chemical agents. Child resistant closure (CRC) - A closure that requires dissimilar motions which may make removal by a child difficult. Subject to government regulations. Clamp speed - Speed at which the mold platens will open and close; controlled by operator settings....

I would like to analyze dyeing and it influence on polymer processing and the final product properties. The key point will be the crystallization . Thermoplastics we can divide into that with amorphous (irregular) and semi crystalline structure (regular) it means crystalline in some area and amorphous in other. Crystallization fallows through the nucleation process when crystals rise and grow. Nucleation impacts on polymer processing and product properties by increasing: • crystallization temperature (reduces cooling time in injection and extrusion molding up to 20%!), • transparency, • mechanical properties. the reason for it is that we have more crystallization centers and fine grained structure opposite to large sferolits. Everything would be ok if we had this knowledge otherwise it can happen that when we dye polymers e.g. with phthalocyanine pigments (blue and green colors) we will receive “natural” nucleation. There is one feature not always desired the shrin...