Kml Mouldings Injection Moulding Operator Interview Questions and Answers

Injection molding is a manufacturing process used to produce parts by injecting molten material into a mold.

• Molten material is injected into a mold cavity

• The material cools and solidifies, taking the shape of the mold

• Commonly used for producing plastic parts

• Can also be used for producing metal, glass, and ceramic parts

Back pressure is the resistance to the flow of molten plastic in the injection moulding machine.

• It is the pressure exerted by the machine's screw on the molten plastic.

• It helps to ensure that the plastic is properly melted and mixed.

• Too much back pressure can cause the plastic to degrade or burn.

• It is measured in pounds per square inch (PSI).

There is no such term as 'suck buck' in injection moulding. It may be a mispronunciation or a term used in a different industry.

• There is no known term in injection moulding called 'suck buck'

• It may be a mispronunciation of a different term

• It could be a term used in a different industry altogether

Short molding is a process where the plastic material is injected into the mold cavity for a shorter duration than usual.

• Short molding is used to produce smaller parts with faster cycle times.

• It requires precise control of the injection speed and pressure.

• Short molding can result in lower part quality if not done correctly.

• Examples of short molding applications include electronic components and medical devices.

PP material stands for Polypropylene. Its melting point ranges from 130°C to 171°C.

• PP is a thermoplastic polymer widely used in injection moulding.

• It has a low density and high stiffness, making it ideal for packaging and automotive industries.

• The melting point of PP varies depending on the grade and can range from 130°C to 171°C.

• PP is resistant to chemicals and has good electrical insulation properties.

• Examples of PP ...read more

ABS stands for Acrylonitrile Butadiene Styrene. Its melting point is lower than its upper limit.

• ABS is a thermoplastic polymer commonly used in injection moulding.

• It is known for its toughness, rigidity, and resistance to impact.

• The melting point of ABS is typically around 105-110°C, which is lower than its upper limit of around 220°C.

• ABS is commonly used in the production of automotive parts, toys, and electronic hous...read more

Sink mark and gate mark are common defects in injection moulding.

• Sink mark is a depression on the surface of the moulded part caused by uneven cooling or insufficient packing pressure.

• Gate mark is a small protrusion or indentation at the point where the plastic enters the mould, caused by the gate being removed from the part.

• Both defects can be minimized by adjusting the moulding parameters, such as cooling time and pa...read more

5S and 6S are lean manufacturing methodologies used to organize and maintain a clean and efficient workplace.

• 5S focuses on workplace organization and standardization of processes to improve efficiency and reduce waste.

• 6S adds safety as a sixth element to 5S, emphasizing the importance of a safe work environment.

• Both methodologies involve regular audits and continuous improvement to maintain a high level of organization...read more