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POM材 material full 方位 interpretation
Date: 2023-09-14 09:20
Views: 3996
Source: Internet
POM is what material and its features and processing process introduction:
POM(polyoxymethylene (POM) resin) is types has 侧脸, high density, high crystallization property property polymer.
POM classification:
POM polyoxymethylene (POM) separation is POM homopolymer and POM copolymer. 两者 important difference: 1, POM homopolymer density, crystallization degree, melting point high, is heat stabilized property 差, processing temperature degree scope/range narrow （约10 degree ）, for acid alkali stability property low 2 而 POM copolymer density, crystallization degree, melting point, strong/high degree relatively low, is heat stabilized property good, easy separation understanding, processing temperature degree scope/range wide （约50 degree ）, for acid alkali stability property relatively good.
POM advantages
1 tool has high machine strong/high degree and rigid property 2 most high fatigue strong/high degree 3 ring resistant force, resistant has machine solvent agent property 佳4 resistant impact property strong/high 5 广泛 use temperature degree scope/range （-40 degree -120 degree ）6 良 good electrical properties 7 复原 property good 8 tool has lubricated property, wear resistance very good
POM applications
electronics electrical appliances: machine, machine, device and other parts automotive: 车, electrical and other parts machine parts: gears, 手, screw, toys and other
POM force property can
POM strong/high degree, rigid property high, elastic property good, decrease abrasion wear resistance good. its force property can excellent, ratio strong/high degree can 达50MPa, ratio rigid degree can 达2650MPa, and metal separation 接近. POM force property can temperature degree small, copolymer POM ratio homopolymer POM 变化稍 large 一点. POM impact strong/high degree relatively high, 但常规 impact and ABS and PC; POM for 缺口敏感, has can make impact strong/high degree decline 90%. POM fatigue strong/high degree separation 突出, 10交变载荷 function rear, fatigue strong/high degree can 达35MPa, 而PA and PC has 28MPa. POM creep property and PA versus 似, in 20 degree, 21MPa, 3000 small is 2.3%, but also temperature degree effect/influence very small. POM scratch small, wear resistance good, 极限PV value very large, lubricated property good. POM products for abrasion 时, high function easy generate similar 尖叫 噪声.
POM electrical property can
POM electrical insulation property relatively good, 几乎不受 temperature degree and wet degree effect/influence dielectric constant and dielectric loss in very wide temperature degree, wet degree and frequency rate scope/range inner very small resistant electrical property good, can in high temperature lower maintain. POM electrical strong/high degree and thick degree has 关, thick degree 0.127mm时 is 82KV/mm, thick degree is 1.88mm时 is 23.6KV/mm.
POM raw materials 辨别
POM is types surface light slip, has gloss hard 而致密 材 material, or white, thin separation semi transparent. 燃烧 features is easy 燃烧, rear 继续燃烧, upper 端呈黄 color, lower 端呈蓝 color, 发生熔 melt 滴落, has strong/high 烈 刺激 property aldehyde 味, 鱼腥臭, for has 刺激流泪 phenomenon
POM raw materials mold requirements
POM极 easy separation understanding, separation understanding temperature degree is 280 degree, separation understanding has property and property odor 发生. mold 钢材宜 selection corrosion resistant material made formed. due to POM raw materials shrinkage rate large mold water uniform for 称. POM in filling easy generate hot generate aldehyde gas and powder therefore 应避免 mold 尖角, type 腔周围 排 gas very important. runner and gate: can use type type gate. if use 隧道形 gate, most good use relatively short type type. for/regarding homopolymer material use hot runner. for/regarding copolymer material can use internal hot runner can use external hot runner
POM raw materials processing process conditions
drying 处理: POM吸 water property 差, therefore processing front can use drying, is most good in processing process in preheating （80 degree left right ）, for product dimensions stability property has benefits molding temperature degree: homopolymer material is 190-230 degree, copolymer material is 190-210 degree. heat stabilized property 差, temperature degree high or in machine inner time long, 会引起刺激人眼 甲 aldehyde gas 体, light 则引起 product color bubbles, heavy 则爆炸. therefore must control molding temperature degree and machine inner time. mold temperature degree: POM raw materials due to crystallization type raw materials therefore crystallization degree for product shrinkage rate effect/influence heavy, improve/increase mold temperature can improve/increase product in mold inner crystallization time. mold temperature especially 敏感, mold temperature 80-105 degree. is decrease/reduce molding rear shrinkage rate can selection high mold temperature degree. injection pressure: 700-1200bar, if is gate pressure loss relatively large, injection shot pressure versus improve/increase. gate and gate pressure loss small versus injection shot 眼里也 decrease/reduce. holding pressure: is improve/increase product molding rear stability property process holding pressure time 需适当 add long can decrease small shrinkage. injection speed degree: due to POM is crystallization type raw materials melt material rear solid relatively fast therefore need use in and other or high injection speed degree.
POM raw materials product easy issues
1. dimensions small: can will holding pressure time add long or add long cooling time, reduce mold temperature decrease small product shrinkage. 2. dimensions process unstable: troubleshooting and its issues （止逆 ring is loss bad ） rear 检查R角处 is has cold material 头, cold material is molding in 每模 进 material pressure different therefore dimensions 不稳. this type of issues use has 倒梯形口 nozzle, ensure nozzle inner 孔直径 small runner 直径, R角不 can loss bad. also has is crystallization defect product rear unstable, will mold temperature degree improve/increase 85 degree above. 3. surface gas 痕: this issues large more is is material due to hot separation understanding 出 甲 aldehyde gas formed, use process upper 我们应 use slow fast slow 思维进行 adjustment, mold amount need has 尖角, 排期一定 need combined 理.
