Problem & Solution

Practical answers to common plastic material challenges

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Poor surface gloss of PU

Molds & Tooling PU gloss mold polishing crystallization scattering nucleating agent

Slow curing of PU coating

PU coating curing speed is determined by NCO/OH ratio and humidity

Extrusion & Post PU coating curing speed NCO/OH ratio drier ambient humidity

Fast UV aging of PU

Fast UV aging is caused by photo-oxidation; UV absorber and HALS are key

Material Analysis PU UV aging UV absorber HALS free radical scavenging

PU material changeover residue

Processing Machinery PU changeover residue purging material screw disassembly dead zone cleaning

Unstable shrinkage of PU

Material Analysis PU shrinkage batch difference temperature control stability crystallization consistency

High density of PU rigid foam

PU rigid foam density is determined by blowing agent dosage and catalyst

Molding Process PU rigid foam high density blowing agent isocyanate index catalyst

Coarse internal crystallization of PU

Molding Process PU coarse crystallization spherulite refinement nucleating agent cooling rate

Unstable weight of PU injection molded products

Product weight stability depends on shot volume precision and holding consistency

Injection Molding PU injection weight fluctuation shot volume holding consistency V/P switchover

Poor weather resistance of PU

Material Analysis PU weather resistance UV absorber HALS photo-oxidation

Ovality of PU extruded pipe exceeding standard

Extrusion & Post PU pipe ovality annular cooling vacuum sizing uniform haul-off

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