Caster TPR plastic injection molding material testing guide before

processing According to the characteristics of the material and the

feeding situation, the appearance and process performance of the material should generally

be tested before molding. The supplied materials often contain different degrees of moisture,

fluxes and other volatile low-molecular substances, especially the water content of TPR, which

has a tendency to absorb moisture, always exceeds the allowable limit for processing. Therefore,

it must be dried and the moisture content measured before processing. At high temperature, the

moisture content of the caster TPR is required to be below 5%, or even 2%~3%, so the vacuum

drying oven is commonly used to dry at 75℃~90℃ for 2 hours. The dried material must be properly

sealed and stored to prevent the material from reabsorbing moisture from the air and losing its drying

effect. For this reason, the use of a drying chamber hopper can continuously provide dry hot material

for the injection molding machine, which is beneficial to simplifying operations, maintaining

cleanliness, improving quality, Increasing the injection rate is beneficial. The charging amount of the

drying hopper is generally 2.5 times the hourly amount of the injection molding machine. SBC

based TPEs outperform most other caster TPR materials in color. As a result, they require less

color masterbatch to achieve a specific color effect, and the color produced is purer than other

caster TPRs. Generally speaking, the viscosity of the color masterbatch should be lower than that

of the caster TPR because the melt index of the caster TPR is higher than that of the color

masterbatch, which will facilitate the dispersion process and make the color distribution more

uniform. For SBS-based TPEs, polystyrene-based vehicles are recommended. Polypropylene (PP)

vehicle is recommended for harder SEBS based caster TPRs. For softer SEBS based casters TPR,

low density polyethylene or ethylene vinyl acetate copolymers are available. For softer varieties, PP

vehicle is not recommended as the hardness of the composite will be affected. For some overmolding

applications, the use of polyethylene (PE) vehicles may adversely affect adhesion to the substrate.

The cleaning barrel generally adopts the heating barrel cleaning method. The cleaning material

generally uses plastic raw materials (or plastic recycling materials). For caster TPR material, the

transition cleaning material can be replaced by the new material processed.

Locking Swivel Casters

Locking Swivel Casters Describe

Locking Swivel Casters Size

Locking Swivel Casters Material

Locking Swivel Casters Scope of application

Application.

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