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Rotational Molding Terms
Sep 22, 2017

Chemical Cross Linking - The process in which individual polymer particles are joined together by a molecular bond. 

 

Chemical Resistance - The ability of a material to withstand various chemical agents. Plastic is capable of enduring many of these chemicals, making it very useful for holding tanks and other containers. 

 

Corrosion - The oxidation and deformation of a material, such as the rusting of iron, due to a chemical reaction. 

 

Cycle Time - The time it takes from the first stage of rotational molding, in which the plastic is loaded, until the plastic completes its final stage and is removed from the mold. 

 

Deflashing - The removal of unwanted material from a molded product, especially from the areas where parting lines of the mold may have caused excess material to be formed. 

 

Density - A significant parameter for polyethylene (PE) that affects the properties, such as stiffness and impact strength, of the end product. 

 

Elasticity - The ability of a material to return to its original form after stress has been applied and quickly removed. 

 

Fusion Temperature - The temperature at which the plastic resin melts and begins to adhere to the surface of the mold. 

 

Grind Ability - The ability of a plastic to be ground into a fine powder. Most plastics are ground prior to being loaded into the mold. 

 

Impact Resistance - The measure of the ability of a plastic to withstand fracture by shock. 

 

Plastic - A generic name for semi-synthetic or synthetic materials that can be extruded or molded into films or objects. Plastic materials are also used for coatings and adhesives. 

 

Polymer - A chain of molecules that is formed by the bonding of individual repeating units (monomers). 

 

Pour Ability - The measure of the speed of a plastic powder when poured through a funnel. For a plastic powder to be acceptable for rotomolding, it must be capable of flowing at least 185 grams/minute. 

 

Resin - Any of various semisolid or solid natural organic materials that are usually translucent or transparent. Resins are mostly utilized in plastics, adhesives and coatings. 

 

Spindles - The "arms" of the rotational molding machine that are responsible for moving the molds between different stages. Spindles also spin on the horizontal and vertical axes to create a uniform filling within the mold. 

 

Thermal Stability - The ability of a resin to withstand specified temperatures. Less thermally stable materials can be rotomolded only under controlled conditions with extreme care. 

 

Thermoplastic - A material that will soften when repeatedly heated and cooled. Examples of thermoplastics include polyethylenes, polypropylene (PP), vinyl and nylons.