Rotational and Slush Molds

Therefore, single-parted rotational and slush molds are prerequisite and are provided with openings out of which the elastic components are ejected off. Ejecting components in electroplated molding is also done through small mold openings. Therefore, model materials are used that can be mechanically or chemically destroyed. 

PVC plastisols are suspensions of PVC resin in a hquid phase mainly constituted by the plasticizer and the stabilizer. Plastisols can be processed by different techniques, such as rotational casting, slush molding, dip molding, dip coating, or spray coating. In these pro-... 

In electroplated molds, a model is molded to the smallest detail (see Section 4.3). The positive model, which corresponds to the finished article, is therefore the basis for electroplated rotational molds and slush molds. The necessary finesse, such as surface quality, dimensional tolerances, mounting parts have to be determined. For example, it is possible in prosthesis manufacture to use rotational molds to get an exact impression of which the inner contour is an impression of the human skin. This shows the precision of electroplated molds and the art to manufacture sufficient models made from resistant materials. 

Plastisols and organosols - PVC powders are dissolved in solvent (organosol) or dispersed in plasticizer (plastisol), and fillers are added in conventional slow speed mixers. The resultant viscous liqtrids arc used to rotationally cast, slush mold or dip articles. Mineral fillers arc used to increase stifihess and hardness, reduce tackiness and reduce costs, although they may increase viscosity and reduce shelf life. 

Material Family Injection Compression Hansfer Casting Cold Molding Coating Structural Foam Extrusion Laminating Sheet Forming RP Molding FRP Filament Dip and Slush Blow Rotational... 

They can be processed by techniques commonly used for thermoplastics, such as extrusion, injection molding, rotational molding, dip, slush molding, and powder and fluidized bed coating,16 and can be expanded into foams.17 Compression and transfer molding of FEP resins can be done, but with some difficulty. Extrusion of PEP is used for primary insulation or cable jackets and for tubing and films. 

See also fluidized-bed coating, rotational molding, centrifugal molding, slush molding, and sinter molding. 

Slush molding is a mnq>le variation of the casting process. The low-viscosity material, such as, plastisol is poured into a hot mold and after a thick casting is formed on the wall of the mold cavity, the excess material is poured out. In order to ensure uniform coating, the mold is often rotated. 

The precise amount of plastisol needed for the part is put into the mold and the mold is closed. There are no openings in the mold, which is attached to a device capable of rotating in all dimensions to create a uniform internal coating. The arm and mold are put in an oven for fusion. Once the material is fused and cooled the mold is opened and the part removed. Balls and doll heads— and other nearly round parts— are most often rotomolded. Part properties are the same as that for slush molding. 

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