Injectoplast Tool Room Engineer Interview Questions, Process, and Tips

There are various types of molds used in tool rooms, including injection molds, blow molds, and compression molds.

• Injection molds are used to create plastic parts by injecting molten material into a mold cavity.

• Blow molds are used to create hollow plastic products, such as bottles, by blowing air into a molten plastic tube.

• Compression molds are used to shape materials, such as rubber, by applying pressure and heat.

• Othe...read more

There are three types of gates on injection molds: sprue, runner, and gate.

• Sprue gate is the entry point for the molten plastic into the mold.

• Runner gate connects the sprue to the part cavity.

• Gate is the opening through which the plastic enters the part cavity.

• Types of gates include edge gate, submarine gate, tab gate, and more.

• The choice of gate type depends on the part design, material, and production requirements.

Sprue types are the channels through which molten metal is poured into a mold.

• Sprue can be open or closed

• Open sprue is used for top pouring and closed sprue is used for bottom pouring

• Sprue can be straight or tapered

• Tapered sprue helps in reducing turbulence and air entrapment

• Sprue can also be designed with a runner system to distribute the molten metal evenly

Plastic materials can be classified into thermoplastics, thermosets, and elastomers.

• Thermoplastics can be melted and re-molded, examples include polyethylene and PVC.

• Thermosets cannot be melted and re-molded, examples include epoxy and phenolic resins.

• Elastomers are rubber-like materials, examples include silicone and neoprene.

Hot runner system is a heating system used in injection molding to keep the plastic material molten in the runner and nozzle.

• Hot runner system is used to reduce waste and improve cycle time in injection molding.

• It consists of a manifold, nozzles, and heaters that keep the plastic material molten.

• The system is controlled by a temperature controller that maintains the temperature of the plastic material.

• Hot runner system...read more