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Multishot Materials

Multishot Terms & Concerns
Many issues can affect the success of a multishot program. Advanced knowledge in these subjects is strongly recommended before engineering, moldmaking, and part production has begun.

Tool Design: Part design should help dictate the type of tool needed to mold a successful part. See our "Engineering Study" for examples.

Shrink: The act of decreasing/altering part size and/or geometry most often caused by cooling. Each plastic that is introduced into the mold may have its own shrink rate.

Venting: Aiding the flow path of melted plastic through the incorporation of air vents (to release gas) resulting in the evacuation of air/gas in the mold's cavity. Part geometry will dictate vent locations.

Bleeding/Product Re-Melt: The result of one or more plastics re-melting in the mold and picking up or "blending" themselves together.

Crush: A term used to describe when tool steel is changed out and a new cavity or core is introduced. The steel will seal against or "crush" areas of part geometry to prevent flash from occurring when additional plastic is introduced into the mold.

Chemical Bond: When two plastics "bond" together during the molding process. This can be accomplished through material selection. Molding parameters such as heat, cooling time, and injection pressure can affect results.

Mechanical Bond: When two plastics "lock" together during the molding process. This can be accomplished through material selection and part geometry. Molding parameters can affect results.

Part Strength: The act of additional plastics entering the mold can warp and distort existing plastic already there. Part design, gate location, materials, and other variables such as injection pressure can affect a part’s strength.