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plastic cosmetic tube manufacturing
Plastic mould products defect correction
by：Lisson
2020-11-20
In the process of plastic production, a variety of reasons caused the defects of each product, several of the following is a common product defects and solutions.
deformation: the product deformation at the time of the mold, mold temperature, is expected to moderate products when the mold temperature is higher, the holding time was not enough and the effect of residual stress in the design, the product wall thickness and uneven contraction, the gate location, improper and inappropriate position of plunger, sticky mould is when the design must be considered.
fracture: back to the material or filler, push rod is too small too little, too much speed too fast, the material temperature is too low, sticky mold, gap is too small to cause the vacuum state, etc. Have insert insert preheat enough can cause cracks. A few products subject to eliminate stress annealing.
the wear: draft demoulding difficulty is too small and not verticality, wear in processing residues, such as grinding machine in cavity after front Angle of burr, roughness is too large, it is easy to solve. Bubble temperature is too low, too high, or too thick wall hanging, moisture content is exorbitant, including solvent or volatile matter, pressure, exhaust, injection cycle is too long to cause plastic decomposition in the cylinder.
deformation: the product deformation at the time of the mold, mold temperature, is expected to moderate products when the mold temperature is higher, the holding time was not enough and the effect of residual stress in the design, the product wall thickness and uneven contraction, the gate location, improper and inappropriate position of plunger, sticky mould is when the design must be considered.
fracture: back to the material or filler, push rod is too small too little, too much speed too fast, the material temperature is too low, sticky mold, gap is too small to cause the vacuum state, etc. Have insert insert preheat enough can cause cracks. A few products subject to eliminate stress annealing.
the wear: draft demoulding difficulty is too small and not verticality, wear in processing residues, such as grinding machine in cavity after front Angle of burr, roughness is too large, it is easy to solve. Bubble temperature is too low, too high, or too thick wall hanging, moisture content is exorbitant, including solvent or volatile matter, pressure, exhaust, injection cycle is too long to cause plastic decomposition in the cylinder.
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