{"id":2424,"date":"2021-06-29T09:40:43","date_gmt":"2021-06-29T13:40:43","guid":{"rendered":"https:\/\/krusetraining.com\/espanol\/?p=2424"},"modified":"2023-10-13T14:05:28","modified_gmt":"2023-10-13T18:05:28","slug":"torstens-training-tip-polymer-materials-overview","status":"publish","type":"post","link":"https:\/\/krusetraining.com\/espanol\/2021\/06\/29\/torstens-training-tip-polymer-materials-overview\/","title":{"rendered":"Torsten’s Training Tip: Polymer Materials Overview"},"content":{"rendered":"

It is important for part and mold designers not only to understand design principles, but also to understand the fundamentals of plastics. The choice of a plastic, or polymer, has a strong impact on the outcome of a molded part.<\/p>\n

Polymers are categorized by processing methods and temperature behavior. The major groups are thermoplastics, thermosets, and elastomers. There are also compounds made up of polymer blends, co-polymers, composites, and thermoplastic elastomers.<\/p>\n

The most common group of polymers are thermoplastics. These are polymers that melt by heating and solidify by cooling. This behavior is different from Thermoset materials.<\/p>\n

Thermoset materials, generally rigid polymers, are injected at a low temperature and then cured with heat inside the mold. This creates an internal chemical reaction that forces the molecular chains to cross-link and form a solid molecular structure. The molecular chains create a chemical bond that cannot be re-melted. Watch the video.<\/a><\/p>\n

\"Thermoplastics<\/a><\/p>\n

Within the category of thermoplastics there are thousands of different base materials and grades. Although it\u2019s virtually impossible to fully understand every available material, having a solid understanding of basic polymer characteristics is imperative to successful part and mold design. This group is further broken down into two main categories, amorphous and semi-crystalline.<\/p>\n

As materials flow, their molecular chains align. When they stop flowing, the molecular chains return to their natural coil-type structures.\u00a0 When polymers go back to their natural relaxed molecular state the molded part shows very little molded-in stress and therefore, less potential part warpage and higher dimensional stability.<\/p>\n

Amorphous materials have a wide process range and can be molded with fewer challenges resulting in molded parts that are more dimensionally stable.<\/p>\n

Semi-crystalline materials have a narrower material processing temperature range. These materials are opaque, have a good resistance to chemicals, and lower moisture absorption. However, they have higher shrinkages. This is important for process technicians to understand when molding semi-crystalline materials.<\/p>\n

Having a general understanding of the basic properties and structures of polymers will help part and mold designers, as well as processors, make choices and decisions that will optimize the final part.<\/p>\n

If you are interested in learning more about polymer materials,\u00a0check out the full demo lesson.<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

It is important for part and mold designers not only to understand design principles, but also to understand the fundamentals of plastics. The choice of a plastic, or polymer, has a strong impact on the outcome of a molded part. Polymers are categorized by processing methods and temperature behavior. 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