聚甲醛的注塑工艺参数

十五、聚甲醛的注塑工艺参数料筒温度喂料区40〜50C(50C)区1160〜180C(180C)区2180〜205C(190C)区3185〜205C〔200C〕区4195〜215C(205C)区5195〜215C(205C)括号内的温度建议作为基本设定值，行程利用率为35%和65%,模件流长与壁厚之比为50：1到100：1熔料温度205〜215°C料筒恒温170C模具温度40〜120C注射压力100—150MPa(1000〜1500bar)；对截面厚度为3〜4mm的厚壁制品件，注射压力约为100MPa(1000bar)，对薄壁制品件可升至150MPa(1500bar)保压压力取决于制品壁厚和模具温度；保压越长，零件收缩越小；保压应为80〜100MPa(800〜1000bar)，模内压力可获得60〜70MPa(600〜700bar)；需要精密成型的地方，保持注射压力和保压为相同水平是很有利的(没有压力降)。相同的循环时间条件下，延长保压时间，成型重量不在增加，这意味着保压时间使之为最优；通常保压时间为总循环时间的30%；成型重量仅为标准重量的95%，因为收缩率为2.3%:成型重量达到100%时，收缩率为1.85%；均衡的和低的收缩率使制品尺寸保持稳定背压5〜10MPa(50〜100bar)注射速度中等注射速度；如果注射速度太慢，模具或熔料温度太低，制品表面往往会出现细孔螺杆转速螺杆转速折合线速度为0.7m/s：将螺杆转速设置为只要能在冷却时间结束前完成塑化过程即可；螺杆扭矩要求为中等计量行程(0.5〜3.5)D残料量2〜6mm，取决于计量行程和螺杆直径预烘干不需要；如果材料受潮，在100C温度下烘干约4h回收率一般成型可用100%的回料，精密成型最多可加20%的回料收缩率约为2%(1.8%〜3.0%)；24h后收缩停止浇口系统壁厚平均的小制品可用点式浇口；浇口的横截面应为制品最厚截面50%〜60%；逆着模腔内一些障碍(中子、隔层)注射为好；用热流道模具成型也是一种工艺法机器停工时段生产结束前5〜10min关闭加热系统，设背压为零，像挤出机清空料筒；当更换其它树脂时，如PA或PC，用PE清洗料筒料筒设备标准螺杆，止逆环，直通喷嘴聚甲醛(POM)注射成型工艺POM(又称赛钢、特灵)。它是以甲醛等为原料聚合所得。POM-H(聚甲醛均聚物)，POM-K(聚甲醛共聚物)是高密度、高结晶度的热塑性工程塑料。具有良好的物理、机械和化学性能，尤其是有优异的耐摩擦性能。POM属结晶性塑料，熔点明显，一旦达到熔点，熔体粘度迅速下降。当温度超过一定限度或熔体受热时间过长，会引起分解。

原料名称代号喷嘴温度第一段温度第二段温度下料段温度PolystyrenePS150-230°C330-445T165-230C330-445T155-215C310-420T145-200C295-390TStyrene_AcrylonitrileSAN(AS)190-280C380-540T150-230C300-445T150-230C300-445T150-230C300-445TAcylonitrile-Butadient-StyreneABS210-230C410-446T220-230C428-446T210-220C410-428T200-210C392-410TCelluloseAcetateCA160-225C320-440T185-225C365-440T175-210C345-410T160-190C320-375TCelluloseAcetateButyrateCAB140-190C285-375T160-190C320-375T150-180C300-355T140-170C285-340TAcrylicPMMA200-250C390-480T220-250C430-485T210-240C410-465T200-230C390-445TPolyphenylenoxide(Noryl)PPO225-290C440-555T245-290C475-555T235-280C455-540T225-270C440-520TPolycarbonatePC250-320C480-610T290-320C555-610T270-300C520-575T250-280C480-540TPolysulphonePSF300-360C575-680T320-360C610-680T310-350C590-660T300-340C575-645TPolyamide6.6(PolyamideA)PA260-295C500-565T270-295C520-565T270-295C520-565T270-295C520-565TPolyamide6(PolyamideB)PA220-260C430-500T230-260C445-500T220-250C430-485T220-240C430-465TPolyamide12PA195-250C385-480T200-250C390-480T190-240C380-465T190-240C380-465TPolyurethane(linear)(PolyamideC)PUR175-230C345-445T200-235C390-455T190-225C375-440T180-215C365-420TAcetatresinPOM185-220C365-430T185-215C365-420T185-200C365-390T185-200C365-390TLin.PolyesterPETP230-290C450-555T240-290C465-555T230-280C445-540T220-270C430-520TPolyethyleneSoftPE185-250C360-480T210-250C410-480T200-240C390-465T190-230C375-445TPolyethyleneHardPE190-300C375-575T230-300C445-575T220-290C430-555T210-280C410-540TPolypropylenePP230-300C445-575T220-290C430-555T210-270C410-520T200-250C390-480TPolytetrafluor-ethylene(HostaflonTeflonFEP)PCTFEFEP320-390C610-735T340-370C645-700T320-350C610-660T300-330C575-625TTefzelETFE325-350C620-600T350-365C600-690T305-355C580-670T295-345C565-655TPVCRigidPVCRigid145-180C295-355T160-180C320-355T150-170C300-340T140-160C285-320TPVCSoftPVCSoft140-200C150-170C140-160C130-150C285-390T300-340T285-320T265-300TPolyphenylenePPS310-320C310-320C300-310C290-300Csulfide590-608T590-608T572-590T554-572T290-310C310-330C300-320C280-290CLiquidCrystalPolymerLCP554-590T590-626T572-608T536-554T330-370C330-370C310-350C300-340CPolyethersulfonePES626-698T626-698T590-662T572-644T320-330C340-360C310-330C290-300CPolyamide-imidePAI608-626T644-680T590-626T554-572T325-410C320-405C310-395C310-330CPolyetherimidePEI617-770T608-761T590-743T590-626T360-400C380-410C370-400C350-380CPolyetheretherketonePEEK680-752T716-770T698-752T662-716T铜是POM降解催化剂，与POM熔体接触的部位应避免使用铜或铜材料。1、塑料处理POM吸水性小，一般为0.2%-0.5%。在通常情况下，POM不需干燥就能加工，但对潮湿原料必须进行干燥。干燥温度80°C以上，时间2小时以上，具体应按供应商资料进行。再生料使用比例一般不超过20-30%。但要视产品的种类和最终用途而定，有时可达100%。2、塑机的选用POM除了要求螺杆无滞料区外，对注塑机没有特别要求，一般注塑即可。3、模具及浇口设计常见模具温度控制为80-90C，流道直径有3-6mm，浇口长度为0.5mm，浇口大小要视胶壁厚度而定，圆形浇口直径至少应制品厚度的0.5-0.6倍，长方形浇口的宽度通常是厚度的2倍或以上，深度为壁厚的0.6倍，脱模斜度40'-1。30’之间。排气系统POM-H厚度0.01-0.02mm宽3mmPOM-K厚度0.04mm宽3mm4、熔胶温度可用空射法量度POM-H可设为215C(190C-230C)POM-K可设为205C(190C-210C)5、注射速度常见为中速偏快，过慢易产生波纹，过快易产生射纹和剪切过热。6、背压越低越好，一般不超过200bar7、滞留时间如设备没有熔胶滞留点POM-H可在215C滞留35分钟POM-K可在205C滞留20分钟不会有严重的分解在注塑温度下熔体不能在机筒内滞留超过20分钟°POM-K在240C下可滞留7分钟。如果停机，机筒温度可降到150C，如要长期停机就必须清理机筒子，关闭加热器。8、停机清理机筒必须用PE或PP,关闭电热，把螺杆推在前位。料筒和螺杆必须保持清洁。杂质或污垢会改变POM的过热稳定性（尤其是POM-H）。所以当用完含卤聚合物或其他酸性聚合物后，应用PE清理干净后才能打POM料，否则会发生爆炸。若作用不当的颜料、润滑剂或含"GF尼龙的物料，会导致塑料降质。9、后处理对于非常温使用的制件且质量要求较高，须进行热处理。退火处理效果，可将制品放入浓度为30%的盐酸溶液中浸30分钟检查，然后用肉眼观察判断是否有残余应力的裂纹产生。注塑温度指引注塑温度指引原料名称代号喷嘴温度第一段温度第二段温度下料段温度PolystyrenePS150-230°C330-445T165-230C330-445T155-215C310-420T145-200C295-390TStyrene_AcrylonitrileSAN(AS)190-280C380-540T150-230C300-445T150-230C300-445T150-230C300-445TAcylonitrile-Butadient-StyreneABS210-230C410-446T220-230C428-446T210-220C410-428T200-210C392-410TCelluloseAcetateCA160-225C320-440T185-225C365-440T175-210C345-410T160-190C320-375TCelluloseAcetateButyrateCAB140-190C285-375T160-190C320-375T150-180C300-355T140-170C285-340TAcrylicPMMA200-250C390-480T220-250C430-485T210-240C410-465T200-230C390-445TPolyphenylenoxide(Noryl)PPO225-290C440-555T245-290C475-555T235-280C455-540T225-270C440-520TPolycarbonatePC250-320C290-320C270-300C250-280C

480-610T555-610T520-575T480-540TPolysulphonePSF300-360°C575-680T320-360C610-680T310-350C590-660T300-340C575-645TPolyamide6.6(PolyamideA)PA260-295C500-565T270-295C520-565T270-295C520-565T270-295C520-565TPolyamide6(PolyamideB)PA220-260C430-500T230-260C445-500T220-250C430-485T220-240C430-465TPolyamide12PA195-250C385-480T200-250C390-480T190-240C380-465T190-240C380-465TPolyurethane(linear)(PolyamideC)PUR175-230C345-445T200-235C390-455T190-225C375-440T180-215C365-420TAcetatresinPOM185-220C365-430T185-215C365-420T185-200C365-390T185-200C365-390TLin.PolyesterPETP230-290C450-555T240-290C465-555T230-280C445-540T220-270C430-520TPolyethyleneSoftPE185-250C360-480T210-250C410-480T200-240C390-465T190-230C375-445TPolyethyleneHardPE190-300C375-575T230-300C445-575T220-290C430-555T210-280C410-540TPolypropylenePP230-300C445-575T220-290C430-555T210-270C410-520T200-250C390-480TPolytetrafluor-ethylene(HostaflonTeflonFEP)PCTFEFEP320-390C610-735T340-370C645-700T320-350C610-660T300-330C575-625TTefzelETFE325-350C620-600T350-365C600-690T305-355C580-670T295-345C565-655TPVCRigidPVCRigid145-180C160-180C150-170C140-160C

295-355T320-355T300-340T285-320TPVCSoftPVCSoft140-200°C285-390T150-170C300-340T140-160C285-320T130-150C265-300TPolyphenylenesulfidePPS310-320C590-608T310-320C590-608T300-310C572-590T290-300C554-572TLiquidCrystalPolymerLCP290-310C554-590T310-330C590-626T300-320C572-608T280-290C536-554TPolyethersulfonePES330-370C626-698T330-370C626-698T310-350C590-662T300-340C572-644TPolyamide-imidePAI320-330C608-626T340-360C644-680T310-330C590-626T290-300C554-572TPolyetherimidePEI325-410C617-770T320-405C608-761T310-395C590-743T310-330C590-626TPolyetheretherketonePEEK360-400C680-752T380-410C716-770T370-400C698-752T350-380C662-716T

原料名称代号喷嘴温度第一段温度第二段温度下料段温度PolystyrenePS150-230°C330-445T165-230C330-445T155-215C310-420T145-200C295-390TStyrene_AcrylonitrileSAN(AS)190-280C380-540T150-230C300-445T150-230C300-445T150-230C300-445TAcylonitrile-Butadient-StyreneABS210-230C410-446T220-230C428-446T210-220C410-428T200-210C392-410TCelluloseAcetateCA160-225C320-440T185-225C365-440T175-210C345-410T160-190C320-375TCelluloseAcetateButyrateCAB140-190C285-375T160-190C320-375T150-180C300-355T140-170C285-340TAcrylicPMMA200-250C390-480T220-250C430-485T210-240C410-465T200-230C390-445TPolyphenylenoxide(Noryl)PPO225-290C440-555T245-290C475-555T235-280C455-540T225-270C440-520TPolycarbonatePC250-320C480-610T290-320C555-610T270-300C520-575T250-280C480-540TPolysulphonePSF300-360C575-680T320-360C610-680T310-350C590-660T300-340C575-645TPolyamide6.6(PolyamideA)PA260-295C500-565T270-295C520-565T270-295C520-565T270-295C520-565TPolyamide6(PolyamideB)PA220-260C430-500T230-260C445-500T220-250C430-485T220-240C430-465TPolyamide12PA195-250C385-480T200-250C390-480T190-240C380-465T190-240C380-465TPolyurethane(linear)(PolyamideC)PUR175-230C345-445T200-235C390-455T190-225C375-440T180-215C365-420T

AcetatresinPOM185-220°C365-430T185-215C365-420T185-200C365-390T185-200C365-390TLin.PolyesterPETP230-290C450-555T240-290C465-555T230-280C445-540T220-270C430-520TPolyethyleneSoftPE185-250C360-480T210-250C410-480T200-240C390-465T190-230C375-445TPolyethyleneHardPE190-300C375-575T230-300C445-575T220-290C430-555T210-280C410-540TPolypropylenePP230-300C4