Problem & Solution

Q

Cracking/Microcracks Appearing on the Surface of Low-Density Polyethylene Injection Molded Products

A

Microcracks are a manifestation of excessive residual internal stress, and need to be prevented by optimizing temperature parameters, reducing internal stress, and improving demolding conditions.

Injection Molding crackingmicrocracksinternal stressmolecular orientationdemolding draft

Q

Uneven Color/Color Difference Appearing on Low-Density Polyethylene Injection Molded Products

A

Color difference is caused by uneven dispersion of the colorant or fluctuations in process parameters, and consistency needs to be ensured from three aspects: mixing, plasticization, and temperature control.

Injection Molding color differencecolor masterbatch dispersiontemperature stabilityback pressurescrew mixing

Q

Underfilling/Short Shot of Low-Density Polyethylene Injection Molded Products

A

Short shot is the result of insufficient melt flowability or excessive mold filling resistance, and needs to be solved by increasing the temperature, pressure, and improving the gating and venting system.

Injection Molding short shotunderfillinginjection pressuremelt flowabilitymold venting

Q

Flow Marks Appearing on the Surface of Low-Density Polyethylene Injection Molded Products

A

Flow marks are a manifestation of an unstable melt flow front, and the flow front is stabilized by increasing the injection speed, mold temperature, and melt temperature.

Injection Molding flow markinjection speedmold temperaturemelt frontmulti-stage injection

Q

Uneven Surface Gloss of Low-Density Polyethylene Injection Molded Products

A

Uneven gloss reflects the inconsistency of the mold surface condition and melt flow, and needs to be improved from three aspects: mold polishing, temperature uniformity, and injection process.

Injection Molding uneven glossmold polishinguniform temperatureinjection speedcooling system

Q

Weld Lines Appearing on Low-Density Polyethylene Injection Molded Products

A

Weld lines are a manifestation of poor melt convergence and fusion, and the melt fusion quality is improved by increasing the melt temperature, injection speed, and mold temperature.

Injection Molding weld linemelt convergenceinjection speedmold temperaturegate design

Q

Bubbles/Voids Appearing on the Surface of Low-Density Polyethylene Injection Molded Products

A

Bubbles and voids are mainly caused by water vaporization, gas involvement, or insufficient shrinkage compensation, and need to be systematically solved from raw '2079851475616104451, injection process, and holding pressure parameters.

Injection Molding bubblesvoidsraw '2079851475616104451holding pressuremulti-stage injection

Q

Warpage Deformation of Low-Density Polyethylene Injection Molded Products

A

Warpage deformation is the core problem of '2079851475616104452 of crystalline materials; its essence is the internal stress caused by non-uniform shrinkage, and it needs to be systematically controlled from multiple dimensions of design, process, and mold.

Injection Molding warpage deformationcrystallization shrinkageuniform mold temperatureuniform wall thicknesscooling time

Q

Underfilling/Short Shot of Low-Density Polyethylene Injection Molded Products (Variant: Strengthened Measures)

A

Short shot is the result of insufficient melt flowability or excessive mold filling resistance, and needs to be solved by increasing the temperature, pressure, and improving the gating and venting system. Targeted preventive measures need to be taken in different production scenarios.

Injection Molding short shotunderfillinginjection pressuremelt flowabilitymold venting

Q

Sink Marks at Thick-Walled Parts of Low-Density Polyethylene Injection Molded Products

A

Sink marks are a typical defect of '2079851475616104452 of crystalline materials; the root cause is that the local volume shrinkage is not effectively compensated, and it needs to be solved coordinately from three aspects: holding pressure parameters, gate design, and cooling conditions.

Injection Molding sink markholding pressurecrystallization shrinkagegate designuniform wall thickness

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