Molding Terminology and Glossary: A Comprehensive Reference Guide

Molding Terminology and Glossary: A Comprehensive Reference Guide banner by Thriam

Understanding molding terminology is essential for anyone involved in the manufacturing process. This glossary provides definitions and explanations for common terms used in the world of molding.

Basic Molding Terms

  • Mold:A cavity or hollow container used to shape a material.
  • Material: The substance used to create the desired object.
  • Molding Process:The technique used to force the material into the mold.
  • Parting Line:The line or seam where two halves of a mold meet.
  • Runner:The channel through which the material flows into the mold cavity.
  • Gate:The opening that connects the runner to the mold cavity.
  • Vent:A small opening in the mold that allows air to escape as the material fills the cavity.

Common Molding Processes

  • Injection Molding:A process where molten plastic is injected into a mold under pressure.
  • Blow Molding:A process used to create hollow plastic containers by blowing air into a heated plastic parison.
  • Rotational Molding: A process where a heated mold is rotated while containing a powdered material, causing the material to melt and adhere to the mold walls.
  • Thermoforming:A process where a heated plastic sheet is forced into a mold to create a desired shape.
  • Compression Molding: A process where a material is placed in a mold and compressed between two halves, forcing it to fill the cavity.

Mold Design Terms

  • Cavity:The hollow space within a mold that forms the shape of the molded part.
  • Core:A removable part of a mold that creates internal features or undercuts.
  • Ejector Pin:A pin used to push the molded part out of the mold cavity.
  • Draft Angle:The angle at which the sides of a mold cavity are tapered to facilitate part ejection.
  • Runner Balance:The distribution of material flow through the runners to ensure even filling of the mold cavities.

Molding Defects

  • Flash:Excess material that escapes the mold cavity and forms a thin, unwanted layer on the molded part.
  • Short Shot:A molded part that is incomplete due to insufficient material flow.
  • Sink Mark:A depression or indentation on the surface of a molded part.
  • Warping:Distortion of the molded part due to uneven cooling or material shrinkage.

Mold Maintenance Terms

  • Preventive Maintenance:Regular inspections, cleaning, and lubrication to prevent breakdowns and extend the lifespan of molds.
  • Corrective Maintenance:Repairs or replacements made to address specific problems or failures.
  • Predictive Maintenance: Using technology to monitor equipment performance and predict potential failures.
  • This glossary provides a solid foundation for understanding molding terminology. As you delve deeper into the field, you will encounter more specialized terms related to specific applications and materials.

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