注塑成型技术 读书笔记

lhywang

<span class="c" id="yuyuzi">&nbsp; <p class="MsoNormal" align="center" style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center;"><span style="FONT-SIZE: 22pt; FONT-FAMILY: 华文行楷; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt;">注塑成型技术</span><span lang="EN-US" style="FONT-SIZE: 22pt; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: 华文行楷;"><p></p></span></p><p class="MsoNormal" align="center" style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center;"><span lang="EN-US" style="FONT-SIZE: 22pt; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: 华文行楷;"><p>&nbsp;</p></span></p><p class="MsoNormal" align="center" style="MARGIN: 0cm 0cm 0pt 63.75pt; TEXT-INDENT: -63.75pt; TEXT-ALIGN: center; tab-stops: list 63.75pt; mso-list: l0 level1 lfo2;"><span lang="EN-US" style="FONT-SIZE: 16pt; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: 华文行楷; mso-bidi-font-family: 华文行楷;"><span style="mso-list: Ignore;">第一章<span style="FONT: 7pt 'Times New Roman';">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><span style="FONT-SIZE: 16pt; FONT-FAMILY: 华文行楷; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt;">概</span><span style="FONT-SIZE: 16pt; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: 华文行楷;"> </span><span style="FONT-SIZE: 16pt; FONT-FAMILY: 华文行楷; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt;">况</span><span lang="EN-US" style="FONT-SIZE: 16pt; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: 华文行楷;"><p></p></span></p><p class="MsoNormal" align="center" style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center;"><span lang="EN-US" style="FONT-SIZE: 16pt; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: 华文行楷;"><p>&nbsp;</p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 150%;"><font size="3"><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">塑料的优点：塑料的密度是三类材料中最小的，具有较高的比强度。</span><span lang="EN-US" style="LETTER-SPACING: 1.4pt;"><p></p></span></font></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 150%;"><font size="3"><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">塑料的缺点：强度、硬度较低，容易老化。</span><span lang="EN-US" style="LETTER-SPACING: 1.4pt;"><p></p></span></font></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 150%;"><font size="3"><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">塑料的主要组成物：树脂。</span><span lang="EN-US" style="LETTER-SPACING: 1.4pt;"><p></p></span></font></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 150%;"><font size="3"><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">四大工程塑料；</span><span lang="EN-US" style="LETTER-SPACING: 1.4pt;">PA</span><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">、</span><span lang="EN-US" style="LETTER-SPACING: 1.4pt;">POM</span><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">、</span><span lang="EN-US" style="LETTER-SPACING: 1.4pt;">ABS</span><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">、</span><span lang="EN-US" style="LETTER-SPACING: 1.4pt;">PC</span><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">。</span><span lang="EN-US" style="LETTER-SPACING: 1.4pt;"><p></p></span></font></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 150%;"><font size="3"><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">四大通用塑料：</span><span lang="EN-US" style="LETTER-SPACING: 1.4pt;">PE</span><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">、</span><span lang="EN-US" style="LETTER-SPACING: 1.4pt;">PVC</span><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">、</span><span lang="EN-US" style="LETTER-SPACING: 1.4pt;">PS</span><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">、</span><span lang="EN-US" style="LETTER-SPACING: 1.4pt;">PP</span><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">。</span><span lang="EN-US" style="LETTER-SPACING: 1.4pt;"><p></p></span></font></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 66.5pt; TEXT-INDENT: -66.5pt; LINE-HEIGHT: 150%; mso-char-indent-count: -5.0;"><font size="3"><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">注射压力：注射时，在其螺杆头部的熔体所建立起来的压力称为注射压力。</span><span lang="EN-US" style="LETTER-SPACING: 1.4pt;"><p></p></span></font></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 150%;"><font size="3"><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">注射速度：螺杆推进熔体的速度称为注射速度。</span><span lang="EN-US" style="LETTER-SPACING: 1.4pt;"><p></p></span></font></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 66.5pt; TEXT-INDENT: -66.5pt; LINE-HEIGHT: 150%; mso-char-indent-count: -5.0;"><font size="3"><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">保压阶段：是从熔体充满模腔开始到浇口冻封为止，注射阶段完成后必须继续保持注射压力，维持熔体的外缩流动，一直持续到浇口冻封为止。因此，保压阶段的特点是；压力表现是主要的，在保压压力作用下，模腔中的熔体得到冷却补缩和进一步地压缩和增密。</span><span lang="EN-US" style="LETTER-SPACING: 1.4pt;"><p></p></span></font></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 66.5pt; TEXT-INDENT: -66.5pt; LINE-HEIGHT: 150%; mso-char-indent-count: -5.0;"><font size="3"><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">冷却阶段：是从浇口冻封开始至制品脱模为止，保压压力撤除后，模腔中的熔体继续冷却定型，使制品能够承受脱模顶出时所允许的变形，冷却定型过程的特点；温度表现是主要的。</span><span lang="EN-US" style="LETTER-SPACING: 1.4pt;"><p></p></span></font></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 66.5pt; TEXT-INDENT: -66.5pt; LINE-HEIGHT: 150%; mso-char-indent-count: -5.0;"><font size="3"><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">预塑背压：是螺杆一边后退一边旋转，把熔体从均化段的螺槽中向前挤出，使之汇集在螺杆头部的空间，形成熔体储存室或计量室，并在室中建立了熔体压力，此压力为背压。</span><span lang="EN-US" style="LETTER-SPACING: 1.4pt;"><p></p></span></font></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 66.5pt; TEXT-INDENT: -66.5pt; LINE-HEIGHT: 150%; mso-char-indent-count: -5.0;"><font size="3"><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">注塑充模过程（周期）可分为以下几段：①注塑充模流动阶段；②保压补缩流动阶段；③保压切换倒流阶段。在保压阶段熔体仍有流动，称为保压流动，保压压力又称为二次注射压力，保压流动和充模时的压实流动都是在高压下一的熔体致密流动，这时的流动特点是熔体流速很小，不起主导作用，而压力却是影响过程的主要因素。在保压阶段，模内压力和比容不断地变化。产生保压流动的原因是因为模腔壁附近的熔体受冷后收缩，熔体比容发生变化，这样，在流入口冻封之前，熔体在注射压力作用下继续向模腔补充熔体，产生补缩的保压流动。</span><span lang="EN-US" style="LETTER-SPACING: 1.4pt;"><p></p></span></font></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 66.5pt; TEXT-INDENT: -66.5pt; LINE-HEIGHT: 150%; mso-char-indent-count: -5.0;"><span lang="EN-US" style="LETTER-SPACING: 1.4pt;"><p><font size="3">&nbsp;</font></p></span></p><p class="MsoNormal" align="center" style="MARGIN: 0cm 0cm 0pt 94pt; TEXT-INDENT: -94pt; LINE-HEIGHT: 150%; TEXT-ALIGN: center; mso-char-indent-count: -5.0;"><font size="3"><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';"></span><span lang="EN-US" style="LETTER-SPACING: 1.4pt;"><p></p></span></font>&nbsp;</p></span>

lhywang

<p class="MsoNormal" align="center" style="MARGIN: 0cm 0cm 0pt 94pt; TEXT-INDENT: -94pt; LINE-HEIGHT: 150%; TEXT-ALIGN: center; mso-char-indent-count: -5.0;"><span style="FONT-SIZE: 16pt; LINE-HEIGHT: 150%; FONT-FAMILY: 华文行楷; LETTER-SPACING: 1.4pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt;">第二章</span><span style="FONT-SIZE: 16pt; LINE-HEIGHT: 150%; LETTER-SPACING: 1.4pt; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: 华文行楷;"> </span><span style="FONT-SIZE: 16pt; LINE-HEIGHT: 150%; FONT-FAMILY: 华文行楷; LETTER-SPACING: 1.4pt; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt;">注塑成型条件</span><span lang="EN-US" style="FONT-SIZE: 16pt; LINE-HEIGHT: 150%; LETTER-SPACING: 1.4pt; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: 华文行楷;"><p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 21pt; TEXT-INDENT: -21pt; LINE-HEIGHT: 150%; tab-stops: list 21.0pt; mso-list: l1 level1 lfo1;"><span lang="EN-US" style="LETTER-SPACING: 1.4pt; mso-bidi-font-family: 宋体;"><span style="mso-list: Ignore;"><font size="3">一、</font><span style="FONT: 7pt 'Times New Roman';">&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><font size="3"><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">注射压力</span><span lang="EN-US" style="LETTER-SPACING: 1.4pt;"><p></p></span></font></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 39pt; TEXT-INDENT: -18pt; LINE-HEIGHT: 150%; tab-stops: list 39.0pt; mso-list: l1 level2 lfo1;"><span lang="EN-US" style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-bidi-font-family: 宋体;"><span style="mso-list: Ignore;"><font size="3">＊</font><span style="FONT: 7pt 'Times New Roman';">&nbsp; </span></span></span><font size="3"><span lang="EN-US" style="LETTER-SPACING: 1.4pt;">1</span><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">次注射压力过低，会引起充填不足的情况；</span><span lang="EN-US" style="LETTER-SPACING: 1.4pt;"><p></p></span></font></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 39pt; TEXT-INDENT: -18pt; LINE-HEIGHT: 150%; tab-stops: list 39.0pt; mso-list: l1 level2 lfo1;"><span lang="EN-US" style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-bidi-font-family: 宋体;"><span style="mso-list: Ignore;"><font size="3">＊</font><span style="FONT: 7pt 'Times New Roman';">&nbsp; </span></span></span><font size="3"><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">较高的</span><span lang="EN-US" style="LETTER-SPACING: 1.4pt;">1</span><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">次注射压力可使制口的密度增大，收缩率减少；</span><span lang="EN-US" style="LETTER-SPACING: 1.4pt;"><p></p></span></font></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 39pt; TEXT-INDENT: -18pt; LINE-HEIGHT: 150%; tab-stops: list 39.0pt; mso-list: l1 level2 lfo1;"><span lang="EN-US" style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-bidi-font-family: 宋体;"><span style="mso-list: Ignore;"><font size="3">＊</font><span style="FONT: 7pt 'Times New Roman';">&nbsp; </span></span></span><font size="3"><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">但过高的话，则会使制品产生毛边或发生较大的残余应力，会使制品因脱模困难而影响工作效率；</span><span lang="EN-US" style="LETTER-SPACING: 1.4pt;"><p></p></span></font></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 39pt; TEXT-INDENT: -18pt; LINE-HEIGHT: 150%; tab-stops: list 39.0pt; mso-list: l1 level2 lfo1;"><span lang="EN-US" style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-bidi-font-family: 宋体;"><span style="mso-list: Ignore;"><font size="3">＊</font><span style="FONT: 7pt 'Times New Roman';">&nbsp; </span></span></span><font size="3"><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">因此，在试制制品时应从低压开始并逐渐地提高，以确定合适的注射压力。</span><span lang="EN-US" style="LETTER-SPACING: 1.4pt;"><p></p></span></font></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 21pt; TEXT-INDENT: -21pt; LINE-HEIGHT: 150%; tab-stops: list 21.0pt; mso-list: l1 level1 lfo1;"><span lang="EN-US" style="LETTER-SPACING: 1.4pt; mso-bidi-font-family: 宋体;"><span style="mso-list: Ignore;"><font size="3">二、</font><span style="FONT: 7pt 'Times New Roman';">&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><font size="3"><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">保压压力</span><span lang="EN-US" style="LETTER-SPACING: 1.4pt;"><p></p></span></font></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 39pt; TEXT-INDENT: -18pt; LINE-HEIGHT: 150%; tab-stops: list 39.0pt; mso-list: l1 level2 lfo1;"><span lang="EN-US" style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-bidi-font-family: 宋体;"><span style="mso-list: Ignore;"><font size="3">＊</font><span style="FONT: 7pt 'Times New Roman';">&nbsp; </span></span></span><font size="3"><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">其压力设定往往比注射压力低，但必须保持到模腔中的物料完全固化；</span><span lang="EN-US" style="LETTER-SPACING: 1.4pt;"><p></p></span></font></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 39pt; TEXT-INDENT: -18pt; LINE-HEIGHT: 150%; tab-stops: list 39.0pt; mso-list: l1 level2 lfo1;"><span lang="EN-US" style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-bidi-font-family: 宋体;"><span style="mso-list: Ignore;"><font size="3">＊</font><span style="FONT: 7pt 'Times New Roman';">&nbsp; </span></span></span><font size="3"><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">作用；在防止毛边的发生和过度充填的基础上，把伴随冷却固化中因收缩引起的体积减少的部分，从喷嘴用熔体物料进行不断地补充，以防止制品因收缩而产生缩痕。</span><span lang="EN-US" style="LETTER-SPACING: 1.4pt;"><p></p></span></font></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 21pt; TEXT-INDENT: -21pt; LINE-HEIGHT: 150%; tab-stops: list 21.0pt; mso-list: l1 level1 lfo1;"><span lang="EN-US" style="LETTER-SPACING: 1.4pt; mso-bidi-font-family: 宋体;"><span style="mso-list: Ignore;"><font size="3">三、</font><span style="FONT: 7pt 'Times New Roman';">&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><font size="3"><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">螺杆背压</span><span lang="EN-US" style="LETTER-SPACING: 1.4pt;"><p></p></span></font></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 39.9pt; TEXT-INDENT: -39.9pt; LINE-HEIGHT: 150%; mso-char-indent-count: -3.0;"><font size="3"><span lang="EN-US" style="LETTER-SPACING: 1.4pt;"><span style="mso-spacerun: yes;">&nbsp;&nbsp;&nbsp; </span></span><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">＊作用：可以提高材料的熔融效果和混炼效果，同时也可以保证使熔融物料在螺杆前部的完充满，以提高注射计量的正确性，但螺杆背压过高，将引起物料处理能力的下降，还将使物料因摩擦热增加而引起温度上升，反之，螺杆背压过低，会引起注射量的计量不准。</span><span lang="EN-US" style="LETTER-SPACING: 1.4pt;"><p></p></span></font></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 21pt; TEXT-INDENT: -21pt; LINE-HEIGHT: 150%; tab-stops: list 21.0pt; mso-list: l1 level1 lfo1;"><span lang="EN-US" style="LETTER-SPACING: 1.4pt; mso-bidi-font-family: 宋体;"><span style="mso-list: Ignore;"><font size="3">四、</font><span style="FONT: 7pt 'Times New Roman';">&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><font size="3"><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">料筒温度</span><span lang="EN-US" style="LETTER-SPACING: 1.4pt;"><p></p></span></font></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 39pt; TEXT-INDENT: -18pt; LINE-HEIGHT: 150%; tab-stops: list 39.0pt; mso-list: l1 level2 lfo1;"><span lang="EN-US" style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-bidi-font-family: 宋体;"><span style="mso-list: Ignore;"><font size="3">＊</font><span style="FONT: 7pt 'Times New Roman';">&nbsp; </span></span></span><font size="3"><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">为了了解物料的实际温度，只能采用对空注射的方法；</span><span lang="EN-US" style="LETTER-SPACING: 1.4pt;"><p></p></span></font></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 39pt; TEXT-INDENT: -18pt; LINE-HEIGHT: 150%; tab-stops: list 39.0pt; mso-list: l1 level2 lfo1;"><span lang="EN-US" style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-bidi-font-family: 宋体;"><span style="mso-list: Ignore;"><font size="3">＊</font><span style="FONT: 7pt 'Times New Roman';">&nbsp; </span></span></span><font size="3"><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">对料筒进行温度设定时，一般是使之保持一定的温度梯度，即从后部至前部的喷嘴应设定使其温度逐步增高。</span><span lang="EN-US" style="LETTER-SPACING: 1.4pt;"><p></p></span></font></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 21pt; TEXT-INDENT: -21pt; LINE-HEIGHT: 150%; tab-stops: list 21.0pt; mso-list: l1 level1 lfo1;"><span lang="EN-US" style="LETTER-SPACING: 1.4pt; mso-bidi-font-family: 宋体;"><span style="mso-list: Ignore;"><font size="3">五、</font><span style="FONT: 7pt 'Times New Roman';">&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><font size="3"><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">模具温度</span><span lang="EN-US" style="LETTER-SPACING: 1.4pt;"><p></p></span></font></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 39pt; TEXT-INDENT: -18pt; LINE-HEIGHT: 150%; tab-stops: list 39.0pt; mso-list: l1 level2 lfo1;"><span lang="EN-US" style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-bidi-font-family: 宋体;"><span style="mso-list: Ignore;"><font size="3">＊</font><span style="FONT: 7pt 'Times New Roman';">&nbsp; </span></span></span><font size="3"><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">模具温度越低，模腔内物料的冷却速度越快，可大大的缩短制品的取出时间，提高成型作业效率；</span><span lang="EN-US" style="LETTER-SPACING: 1.4pt;"><p></p></span></font></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 39pt; TEXT-INDENT: -18pt; LINE-HEIGHT: 150%; tab-stops: list 39.0pt; mso-list: l1 level2 lfo1;"><span lang="EN-US" style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-bidi-font-family: 宋体;"><span style="mso-list: Ignore;"><font size="3">＊</font><span style="FONT: 7pt 'Times New Roman';">&nbsp; </span></span></span><font size="3"><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">但模具温度过低，则易引起制品外观不良，如产生流痕、熔接痕或缩痕等等。</span><span lang="EN-US" style="LETTER-SPACING: 1.4pt;"><p></p></span></font></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 21pt; TEXT-INDENT: -21pt; LINE-HEIGHT: 150%; tab-stops: list 21.0pt; mso-list: l1 level1 lfo1;"><span lang="EN-US" style="LETTER-SPACING: 1.4pt; mso-bidi-font-family: 宋体;"><span style="mso-list: Ignore;"><font size="3">六、</font><span style="FONT: 7pt 'Times New Roman';">&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><font size="3"><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">注射速度</span><span lang="EN-US" style="LETTER-SPACING: 1.4pt;"><p></p></span></font></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 39pt; TEXT-INDENT: -18pt; LINE-HEIGHT: 150%; tab-stops: list 39.0pt; mso-list: l1 level2 lfo1;"><span lang="EN-US" style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-bidi-font-family: 宋体;"><span style="mso-list: Ignore;"><font size="3">＊</font><span style="FONT: 7pt 'Times New Roman';">&nbsp; </span></span></span><font size="3"><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 1.4pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">通过注射速度的控制和调整，可以防止和改善制品外观，如毛边、喷射痕，银丝纹或焦痕等各种不良现象。</span><span lang="EN-US" style="LETTER-SPACING: 1.4pt;"><p></p></span></font></p>

lhywang

<p>&nbsp;</p>[em01]

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