Problema e solução

Respostas práticas para os desafios comuns dos materiais plásticos

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Q

PC/ABS hydrolysis impact strength decrease

A

Hydrolysis is the most serious moisture damage of PC/ABS; the risk of half strength loss makes drying a mandatory process.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Material Drying PC/ABS；hydrolysis；impact strength；molecular chain；drying；irreversible

Q

PC/ABS insufficient drying silver streak

A

90% of PC/ABS silver streaks originate from drying; do not judge dryness by the appearance of the pellets, the moisture content must be measured before adjusting the machine.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Material Drying PC/ABS；drying；silver streak；moisture content；dew point；hydrolysis

Q

PC Intermittent Silver Streaks Caused by Drying Fluctuation

A

PC drying's enemy is 'secondary moisture absorption': qualified drying does not mean always qualified, dew point and sealing must be continuously monitored; intermittent silver streaks mostly require going back to check the state drift of the drying system.

Material Drying PC; drying; secondary moisture absorption; dew point; fluctuation

Q

PC Product Abnormal Odor

A

PC odor = 'degradation or contamination': first lower the temperature, then check the material source; odor is a signal of thermal history and cleanliness, and must be controlled from both the process and raw material ends; after confirming effectiveness, solidify the parameters and practices int...

Material Drying PC; odor; degradation; volatiles; contamination

Q

PC Sheet Extrusion Bubbles

A

PC extrusion: 'water content is the first cause of bubbles, venting vacuum is the insurance': drying and venting work together; PC's hygroscopicity determines that drying must run through the entire extrusion process.

Material Drying PC; extrusion; bubble; drying; vacuum venting

Q

PC/ABS Blend Silver Streaks

A

PC/ABS silver streaks = three things: 'drying + temperature + regrind': the PC component needs drying, the ABS component needs temperature control, and regrind needs a limited ratio; the processing window of blends is narrower than that of single materials, and management must be more detailed.

Material Drying PC/ABS; silver streak; drying; melt temperature; regrind

Q

PC Injection Cycle Fluctuation—Drying Fluctuation

A

PC drying's enemy is 'secondary moisture absorption'.

Material Drying PC; drying; secondary moisture absorption; dew point; fluctuation

Q

PC Brittleness Caused by Regrind Use

A

PC regrind = 'dual deterioration of moisture content and molecular weight': the ratio must be strictly controlled, and it is firmly not used for optical parts and load-bearing parts; PC is sensitive to thermal history and hydrolysis, so regrind management must be stricter than for general-purpose...

Material Drying PC; regrind; brittleness; molecular weight; fine powder

Q

PC Transparent Part Haze Exceeding Standard

A

PC haze = a comprehensive examination of 'moisture, thermal history, mold surface': losing control of any one causes haze; transparent parts must manage the three lines of drying, temperature control, and polishing at the same time.

Material Drying PC; haze; transparency; drying; polishing

Q

PC Brittleness Caused by Hydrolytic Degradation

A

PC hydrolysis is an irreversible 'invisible killer': products with normal appearance may already be performance-scrapped; drying for PC is not a suggestion but a hard threshold, moisture content verification must be incorporated into the startup SOP, otherwise it is handing unqualified products d...

Material Drying PC; hydrolysis; brittleness; molecular weight; drying

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