INJECTION MOLDING ENCYCLOPEDIA
Injection Molding Encyclopedia
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84 articles
Cost Reduction with PA9T in FPC Connectors: Overcoming Thin-Wall Barriers
PA9T (Genestar G1350A, 35% GF): Melting point 300°C, barrel 280–340°C, nozzle 300–350°C, water absorption 0.19%, shrinkage 0.3%/0.9%. A flow length ratio of 75 is the limit for 0.2mm walls. PA9T’s value lies in flap toughness; bodies often remain LCP. Dual-material designs require tolerance analysis.
Why LCP Still Warps in 0.2mm Wall Thickness FPC Connectors
LCP (Vectra E130i, 30% GF): Melting point 335°C, hot runner 335–345°C, mold temp 80–120°C, shrinkage 0.10%/0.40%. 0.2mm thin walls rely on high injection speed; two-stage injection (fast then slow) is needed. Near 4:1 aspect ratios amplify directional differences, resulting in bowing.
LCP for Wire-to-Board: Why Thick Walls Sink and Thin Walls Short?
LCP (Vectra E130i, 30% GF): Melting point 335°C, hot runner 335–345°C, mold temp 80–120°C, shrinkage 0.10%/0.40%. Rapid solidification seals packing channels in thick walls while thin-wall ends drop below flow limits. These opposing defects require separate solutions.
PA46 for Board-to-Board: Why Must Melt Temp Exceed Melting Point by >10°C?
PA46 (Stanyl TS250F6D, 30% GF): Melting point 295°C, melt temp must be >305°C (optimal 305–320°C), barrel/nozzle 305–320°C, shrinkage 0.4%/1.1%. Below 305°C, 0.2–0.3mm thin walls suffer short shots and weak weld lines; this is a temperature issue, not pressure.
PPS for Board-to-Board: Stable Dimensions but Poor Insertion Resistance?
PPS (DURAFIDE 1140A1, 40% GF): Mold temp 150°C, max material temp 360°C, nozzle 310–320°C, shrinkage 0.3%/0.8%, pin gate φ0.8–1.2mm, vent depth 0.005–0.008mm. High modulus ensures dimensional stability but causes stress concentration on terminals and hole walls during insertion due to lack of part deflection.
Replacing LCP with PA9T in Board-to-Board: Three Critical Conditions
PA9T (Genestar G1350A, 35% GF): Melting point 300°C, Tg 125°C, moisture absorption 0.19%, shrinkage 0.3%/0.9% (3x anisotropy), drying 70–90°C × 4–8h. Success depends on three prerequisites: complete filling at fine pitches, coplanarity tolerance, and effective moisture control.
Why Does LCP Warp in 0.4mm Pitch Board-to-Board Connectors?
LCP (Vectra E130i, 30% GF): Melting point 335°C, hot runner 335–345°C, mold temp 80–120°C, shrinkage 0.10%/0.40% (4x anisotropy). Rapid solidification renders packing ineffective. Directional differences must be balanced via gate location and zoned mold temperatures, not extended packing time.
When Is PEEK Justified for Consumer Electronics Parts?
PEEK (Victrex 650G): Melting point 343°C, nozzle 395°C, barrel zones 375/380–385/390°C, mold temp 170–200°C, drying 120–150°C × 3–5h, barrel heating capacity 400°C (HT/ST requires 430°C). The sole criterion: Use PEEK only if no other material can solve the specific core requirement of the part.
How Do PEEK Washers in Transmissions Work Without Lubrication?
PEEK (Victrex 650G): Melting point 343°C, nozzle 395°C, barrel rear/mid/front 375/380–385/390°C, mold temp 170–200°C, drying 120–150°C × 3–5h, barrel capacity 400°C. Wear resistance relies on transfer film formation rather than hardness. Lifespan depends on the combination of material, counterface, and operating conditions.
PEI Stringing: Why Cooling Alone Fails to Break Strings
As an amorphous material with Tg 217°C and no melting plateau, PEI viscosity increases continuously during cooling, resulting in long strings with sharp break points. ULTEM 1010 specs: melt 350–410°C, nozzle 345–405°C, mold temp 135–180°C, drying 150°C for 4–6 hours. Explains why valve pin timing, not just cooling, is required to prevent stringing.
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