What should be paid attention to when selecting mold materials

Characteristics of different materials

ABS

Uses: toys, cabinets, daily necessities

Features: Hard, not fragile, can be glued, but it may appear on the edge when damaged.

Design application: Mostly used in toy shells or parts that are not subject to force.

PP

Uses: toys, daily necessities, packaging plastic bags, bottles

Features: Flexible, strong toughness, high extensibility, but no glue.

Design application: Mostly used in places where parts are to be disassembled due to drop test.

PVC

Uses: soft pipe, hard pipe, soft board, hard board, wire, toy

Features: Soft, tough and elastic.

Design application: Mostly used in toy figure, or some places that need shock absorption or shock absorption.

POM

Uses: mechanical parts, gears, levers, home appliance housings

Features: wear-resistant, hard but fragile, easy to have favorable edges when damaged

Design application: Mostly used in rubber gears, pulleys, and some places that need to be driven and bear high torsion or stress.

Nylon

Purpose: gears, pulleys

Features: Tough, water-absorbing, but becomes fragile when the water is completely evaporated.

Design application: Because the accuracy is difficult to control, it is mostly used for gears with larger modules.

Kraton

Purpose: Motor pad

Features: Soft, flexible, high toughness, and strong extensibility.

Design application: Mostly used as a motor pad to absorb motor vibration and reduce noise.

The size of the wall thickness depends on the external force that the product needs to bear, whether it is used as a support for other parts, the number of supporting columns, the amount of extension, and the plastic material selected. The wall thickness design of general thermoplastics should be limited to 4mm. From an economic point of view, too thick product design not only increases material costs, prolongs the production cycle (cooling time), and increases production costs. From the perspective of product design, a thick product increases the possibility of creating voids (pores), which greatly weakens the rigidity and strength of the product. The most reasonable wall thickness distribution is undoubtedly the uniform thickness of the cut surface in any place, but it is always inevitable to change the wall thickness in order to meet the functional requirements. In this case, the transition from thick rubber to thin rubber should be as smooth as possible. Too sudden wall thickness transition will cause dimensional instability and surface problems due to different cooling rates and turbulence.

 The common wall thickness of different materials affects the plastic mold

ABS

Generally, the first choice of material, the wall thickness is usually 1, 1.2, 1.5, 2, 2.5, 3mm, depending on the size and function of the product.

PP

Because it is soft and due to shrinkage, it should not be too thick, generally 1, 1.2, 1.5mm.

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