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Insufficient long-term hydrostatic strength of low density polyethylene PPR pipes

Insufficient long-term hydrostatic strength is caused by material selection and processing quality; comprehensive control of raw material, process, and welding is needed.

Extrusion & Post hydrostatic strengthPPRmolecular weightpipe wall thicknesscrystallinity

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Large creep deformation of low density polyethylene injection products

Creep deformation is an inherent characteristic of crystalline materials under long-term load; it needs to be controlled by increasing crystallinity, reducing stress, and selecting appropriate materials.

Injection Molding creep deformationcrystallinityuse temperaturemolecular weightstress level

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Insufficient elongation at break of low density polyethylene injection products

Insufficient elongation at break reflects poor material toughness; plastic deformation ability needs to be improved by optimizing temperature parameters and reducing defects.

Injection Molding elongation at breakmolecular orientationcrystallization qualityresidual stressmaterial toughness

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Barrel temperature control failure of low density polyethylene injection machine

Temperature control failure is caused by sensor or heater failure; thermocouples, heater bands, and temperature controllers need to be systematically checked.

Injection Molding temperature control failurethermocoupleheater bandtemperature controllerPID parameters

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Leakage of low density polyethylene PPR pipe welding joints

PPR welding joint leakage is caused by improper welding parameters or welding surface contamination; welding temperature, time, and cleanliness need to be strictly controlled.

Material Analysis PPR weldinghot-melt weldingwelding temperaturewelding timefitting matching

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Sharkskin on the surface of low density polyethylene extruded products

Sharkskin is the result of stick-slip flow of the melt at the die exit; it is improved by increasing die temperature and reducing extrusion speed.

Extrusion & Post sharkskinmelt fracturedie temperatureextrusion speeddie polishing

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Low hardness of low density polyethylene injection products

Low hardness is mainly caused by insufficient crystallinity or material degradation; it needs to be improved by increasing mold temperature and holding pressure.

Injection Molding low hardnesscrystallinitymold temperatureholding pressurenucleating agent

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Nozzle drooling in low density polyethylene '2079851475616104452

Drooling is caused by high nozzle temperature and residual pressure; it is solved by lowering temperature, adjusting back pressure, and increasing suck-back.

Injection Molding droolingnozzle temperatureback pressuresuck-back amountneedle valve nozzle

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Fast gate freezing of low density polyethylene injection mold

Gate freezing too fast is caused by small gate size or low temperature; freezing time needs to be extended by enlarging the gate and increasing temperature.

Injection Molding gate freezinggate sizemold temperaturemelt temperatureholding pressure

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Unstable mold temperature control in low density polyethylene '2079851475616104452

Unstable mold temperature is caused by improper cooling system design or maintenance; it needs to be solved from the mold temperature controller, water channel design, and maintenance.

Injection Molding unstable mold temperaturemold temperature controllercooling water channelscaletemperature uniformity

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Tüm Konular 11636 Material Drying 1439 Injection Molding 1506 Molding Process 740 Molds & Tooling 1506 Processing Machinery 2025 Extrusion & Post 2239 Blow Molding 315 Thermoforming 141 Material Analysis 1343 Production & Quality 382

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