INJECTION MOLDING ENCYCLOPEDIA
Injection Molding Encyclopedia
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How Do Flow and Shrinkage Change When Increasing Glass Fiber from 30% to 50%?
Increasing glass fiber content raises melt viscosity and reduces flow length ratio. Average shrinkage decreases, but the difference between flow-direction and transverse shrinkage increases. LCP 30% GF: 0.10%/0.40%; PPS 40%: 0.3%/0.8%; PA9T 35%: 0.3%/0.9%. Eighty percent of warpage in thin-walled long parts comes from directional differences.
Why Is PPS a Safe Choice for Micro Connectors Requiring Reflow Soldering?
PPS (DURAFIDE 1140A1, 40% GF): Mold temp 150°C, material temp must not exceed 360°C, nozzle 310–320°C, pin gate φ0.8–1.2mm, vent depth 0.005–0.008mm, shrinkage 0.3%/0.8%. After reflow soldering, re-measure dimensions, warpage, and terminal positions. PPS excels in thermal stability and dimensional accuracy but is brittle.
Why Use PA9T Instead of LCP for Micro Connector Housings?
PA9T (Genestar G1350A, 35% GF): Melting point 300°C, Tg 125°C, water absorption 0.19%, shrinkage 0.3%/0.9%, drying 70–90°C × 4–8h, barrel 280–340°C, nozzle 300–350°C. PA9T is chosen for housings due to toughness, appearance, and assembly, but it cannot fill walls thinner than 0.15mm.
How Thin Can LCP Go for 0.35mm Pitch Micro 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%. Achieving 0.15mm wall thickness relies on injection speed filling, using fast-then-slow profiles. Runner balance and vent depth are key to yield in multi-cavity molds.
When Is PEEK Mandatory for High-Voltage Connectors on 800V Platforms?
PEEK (Victrex 650G): Melting point 343°C, long-term service temperature around 250°C depending on grade, nozzle 395°C, barrel zones 375/380–385/390°C, mold temp 170–200°C, cylinder requires 400°C. 800V primarily impacts creepage distance and insulation design; long-term high temperature and life margin requirements drive the switch to PEEK.
PPS Overmolding on Metal Inserts in HV Connectors: Causes of Interface Cracking
PPS (DURAFIDE 1140A1, 40% GF): Mold temp 150°C, max material temp 360°C, nozzle 310–320°C, vent depth 0.005–0.008mm. Interface cracking stems from CTE mismatch and uneven overmold thickness. Insert fillets, preheating, and positioning accuracy must be addressed together.
LCP Thick-Wall Challenges in Large Automotive HV 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%. Center filling fails in 2–3mm thick walls, causing voids and sink marks. Late gate freezing, higher mold temps, and insert preheating are key solutions.
When to Use PEEK in FPC Connectors: The Specific Scenario
PEEK (Victrex 650G): Melting point 343°C, nozzle 395°C, barrel zones 375/380–385/390°C, mold temp 170–200°C, cylinder needs 400°C, drying 120–150°C × 3–5h. Typical use case: Long-term >180°C, 0.2mm thin walls, and strict dimensional stability—all three conditions required.
Is PA46 Flow Sufficient for 0.2mm FPC Connectors?
PA46 (Stanyl TS250F6D, 30% GF): Melting point 295°C, melt must be >305°C, optimal 305–320°C, shrinkage 0.4%/1.1%. Flow fills 0.2mm thin walls, but the processing window is only 15°C. Small part weight with large runners amplifies residence time, leading to degradation and black spots.
PPS in FPC Connectors: Stable Dimensions but Flap Cover Cracking
PPS (DURAFIDE 1140A1, 40% GF): Mold temp 150°C, max material temp 360°C, nozzle 310–320°C, vent depth 0.005–0.008mm. High mold temp aids 0.2mm thin-wall filling, but low elongation at break causes cracking in flap hinges and clips. Consider using PA9T for the flap while keeping PPS for the body.
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