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304 North Cardinal St.
Dorchester Center, MA 02124
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Weekend: 10AM - 5PM
Purchase of bumper moulding Plastics plastics for bumper mould can be bought in one of two ways: base materials, including resins, catalysts, fillers, and other compounding ingredients, as well as reinforcements, can be bought directly from basic materials suppliers and formulated…
CREATIVE THINKING Design for production is a creative occupation. Creative thinking is not, of course, confined to a particular field or to a few individuals, but is possessed in varying degrees by people in many occupations: the artist sketches,…
Patterns and Molds This is primarily a plaster pattern shop supple merited by a limited amount of woodworking equipment. The size and amount of equipment required will be determined by how to make plastic molds as to the size…
Molding Plastics Most of the literature on injection molding processing refers entirely or primarily to TPs; very little, if any at all, refers to thermoset TS plastics. At least 90 wt% of all injection-molded plastics are TPs. Injection molded parts…
What is a Polymer? Thermoplastics are just one class of a much larger category of materials polymers. Some familiar examples of the vast variety of products, both natural and man-made, that are composed of polymers are paper cellulose, a natural…
Overcoming Design Limitations The necessity for, and the problems in obtaining, uniform wall thickness in blow molding part causes the molder to consider many special techniques. Some of the concepts to be reviewed in this section are production realities while…
COMPRESSION MOLDING History History has failed to establish definitely the date of origin of the art of molding. It might be said that the art of molding originated with prehistoric man when he learned how to form pottery from clay,…
BLOWN-FILM DIES AND TOOLING The basic die used in making blown film is a tubing die that produces a thin wall tube. After the thin-wall tube is extruded, it is inflated by air pressure to form a large-diameter bubble of…
Fig. 1 illustrates a die equipped with a choke bar assembly used to compensate for flow variations that may exist across the width of the die. The final adjustment for extruded sheet thickness is made with the “die blade adjustment screws，’…
Analytical relationships for flow rates versus pressure, which apply to the flow of plastics materials, are shown in Table 10.1. However, this table is a strict application to Newtonian fluids, where the resistance to flow is independent of the shear…
