STM3163 polymer v3

What is coextrusion primarily used for?

• To inject polymer into molds

• To merge and weld extrudates from multiple extruders

• To create a single-layer film

• To coat substrates with metal

Which materials are commonly used in injection molding?

• PVC, PS, and PET

• EVOH and nylon

• LDPE and aluminum

• BOPP and PVDC

What is the primary advantage of injection stretch blow molding?

• Lower production costs

• Higher precision in neck and finish areas

• Simpler manufacturing process

• Faster cooling times

What is extrusion coating primarily used for?

• To apply a thin layer of plastic onto substrates

• To produce high-quality bottles

• To create multilayer structures

• To mold solid plastic parts

What is the main purpose of vacuum metallization?

• To create a thick metal layer on plastic

• To increase the flexibility of plastic materials

• To improve the barrier properties of plastic films

• To enhance the color of plastics

Which of the following is a characteristic of cast film extrusion?

• Produces films with good optical properties

• Is limited to single-layer films

• Involves blowing air into the melt

• Requires high melt strength

What is the main difference between dry bond and wet bond lamination?

• Dry bond is faster than wet bond

• Dry bond uses heat, wet bond does not

• Wet bond is used for thicker substrates

• Dry bond requires drying before lamination, wet bond does not

What is a common application of extrusion lamination?

• Combining substrates for food packaging

• Producing thin metal layers

• Manufacturing injection molded bottles

• Creating solid plastic parts