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Several reasons for analysis of plastic pallet easy to brittle

by:Qusheng     2020-11-01
Brittle Plastic collapsible crateis a reflection of tray aging appearance, tray aging will be plastic color, crisp, easy cracking and other appearances, Plastic collapsible crateis aging means guess macromolecular chains have crack, plastic has the solution, plastic with different components, some component additive will react because especially the effect of ultraviolet (uv) light or evaporation, some matter changes in the plastic tray, make its original characteristics, constitute the ageing of the blue plastic tray, brittle.
a, Plastic collapsible cratematerial aspects:
( 1) Raw materials mixed with other impurities or with improper or excessive solvent or other additives.
( 2) Some plastics such as ABS, under the condition of be affected with damp be affected with damp heat and water vapor will happen catalytic cracking reaction, result in large strain of parts.
( 3) Plastic regeneration frequency or reworked material content is too high, or within the barrel heating time is too long, cause embrittlement of fabrication.
( 4) Poor quality plastic itself, such as molecular weight distribution, contains the uneven structure such as molecular chain rigidity is too large in the number of components; Or the other plastic doping pollution, bad additives pollution, dust pollution of impurities is also the cause of brittle.
2, plastic tray technology:
( 1) A barrel, nozzle temperature is too low, raised it. If the material easy degradation, should raise the temperature of barrel, nozzle.
( 2) Reduce the screw plastic back pressure and rotational speed, make the material a little loose, and reducing the plastic degradation caused by shear overheating.
( 3) Mold temperature is too high, demoulding difficulty; Mold temperature is too low, premature plastic cooling, fusion welded seam bad, easy to crack, especially when high melting point, such as polycarbonate plastic.
( 4) Mold core to a proper draft. Core difficult demoulding, to improve the mold temperature, shorten the cooling time. Cavity is difficult to take off, want to lower the temperature in the cavity, extend the cooling time.
( 5) As far as possible with a metal insert, such as polystyrene plastic of this kind of specific volume of brittleness of cold heat is big, can't join the insert molding.



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