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Draft angle design is an important factor when designing plastic parts. Because of shrinkage of plastic material, injection molded parts have a tendency to shrink onto a core. This creates higher contact pressure on the core surface and increases friction between the core and the part, thus making ejection of the part from the mold difficult.
Mack Group is a privately held corporation providing contract manufacturing with specialties in plastics design, prototyping, molding, sheet metal fabrication and full product assembly. Mack was founded in 1920 in Little Falls, N.J.
Resin code for polyethylene terephthalate Polypropylene lid of a Tic Tac box, with a living hinge and the resin identification code, 5, under its flap. The Resin Identification Code (RIC) is a technical standard with a set of symbols appearing on plastic products that identify the plastic resin out of which the product is made. [1]
Parkesine, the first member of the Celluloid class of compounds and considered the first man-made plastic, is patented by Alexander Parkes. [4] 1869: John Wesley Hyatt discovers a method to simplify the production of celluloid, making industrial production possible. 1872: PVC was accidentally synthesized in 1872 by German chemist Eugen Baumann ...
The company pioneered the use of pyroxylin plastic in hair combs, toilet articles, and a number of different products. In 1914, the Viscoloid Company began marketing pyroxylin plastic toys. [2] The toy industry quickly became the company's most profitable, and Viscoloid was soon the leading pyroxylin plastic toy manufacturer in America. [2]
The state Senate in Massachusetts has passed a wide-ranging bill curtailing the use of plastics, including barring the purchase of single-use plastic bottles by state agencies. The bill, approved ...
The trend towards thin wall molding continues to increase in many plastic industries as plastic material and energy costs continue to rise and delivery lead times are squeezed. [2] The following industries make use of thin wall molding: food packaging ( e.g. food containers and lids) [3] automotive (e.g. both structural and non-structural car ...
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