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Q

Ripples (flow marks) on PP products

A

PP ripples are the externalization of the front's 'disrupted rhythm': smooth the speed curve and preserve the front temperature, and the ripples will disappear; it is essentially a filling stability problem, not a surface treatment problem.

Injection Molding PP; ripples; flow marks; front; speed curve; mold temperature

Q

Repeated material shortage at a fixed point in PP '2079851475616104452 (venting type)

A

For repeated material shortage at a fixed point, suspect venting before pressure: use the short-shot method to locate the last fill point, and opening vents at the correct position is the real cure; blindly raising pressure only turns a trapped-air problem into a flash problem.

Injection Molding PP; material shortage; venting; short-shot method; last fill point

Q

Environmental stress cracking (ESCR) of PP products

A

Before PP contains chemicals, ESCR verification must be done first: problems occur only when the material grade, internal stress, and medium are superimposed; don't blame only the material for cracked parts—internal stress management and structural fillets are equally important.

Production & Quality PP; ESCR; stress cracking; medium; grade; internal stress

Q

Unclear detail replication in PP/TPO '2079851475616104458

A

Detail replication in '2079851475616104458 depends on 'vacuum in place + sufficient temperature + slow speed': for unclear details, first check whether the vacuum system truly establishes sufficient pressure differential, then supplement temperature; texture areas often also require separate cons...

Thermoforming PP; TPO; '2079851475616104458; detail; vacuum; conformance

Q

Chill marks in PP/TPO '2079851475616104458

A

A chill mark is the mark left by 'touching a cold surface too early': raise the mold/plug temperature and postpone the contact timing, and the problem disappears; this is a typical temperature management problem, not a material problem.

Thermoforming PP; TPO; '2079851475616104458; chill mark; plug; mold temperature

Q

Webbing (material pile-up) in PP/TPO '2079851475616104458

A

The key to preventing webbing in olefin sheet '2079851475616104458 is 'pre-blow + temperature control + early vacuum': managing the excess material with pre-stretching is more controllable than simply cutting the sheet smaller, and deep-cavity parts especially cannot do without plug assist.

Thermoforming PP; TPO; '2079851475616104458; webbing; pre-blow; plug

Q

Rough and dull surface of PP-R pipes

A

For rough PP-R pipe surface, investigate in the order of 'temperature → raw material → equipment cleanliness': first ensure plasticization is in place, then check raw material and regrind, and finally clean the equipment; appearance problems are often a mirror of upstream plasticization and raw m...

Processing Machinery PP-R; pipe; rough surface; plasticization; raw material; regrind

Q

Short shot/flash alternation caused by metering fluctuation in PP '2079851475616104452

A

When short shots and flash appear alternately, first suspect the 'metering system' (feeding and non-return ring), not the process parameters; cushion fluctuation is the most intuitive signal—stabilize it first, and the process becomes meaningful.

Injection Molding PP; short shot; flash; metering; non-return ring; cushion

Q

Thickness deviation of PP film (machine direction/transverse direction)

A

PP film thickness must be 'treated by direction': for MD check the stability of extrusion and haul-off, for TD check the symmetry of the die lip and temperature field; adjusting randomly without distinguishing directions often presses down one lump only for another to pop up.

Extrusion & Post PP; film; thickness deviation; MD; TD; die lip

Q

Corrugation/roughness on the inner wall of PP-R pipes

A

PP-R inner wall problems mostly originate from die head distribution and pressure stability, not simply temperature; inner wall forming quality reflects the 'state' of the melt before entering sizing, so investigate from both the die head and pressure fluctuations.

Molds & Tooling PP-R; pipe; inner wall corrugation; die head; sizing; pressure

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카테고리

전체 주제 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