亚洲午夜成人片-日韩人妻无码系列专区-国产第一页浮力影院入口-宅男宅女精品国产av天堂

Welcome to Shenzhen Zhongyuan Plastic Co., Ltd!

News



Tel:(0755)27151698
Fax:(0755)27150611
Mailbox:szzyzcl@163.com / szzy@szzy99.com
Add:Building A1 and A2, No.1 Industrial Zone, yuliu property company, Gongming town, Bao'an District, Shenzhen
Industry information

當前位置:

首頁 News Industry information

Factors affecting the shrinkage of plastic shell

Release time:2023-10-17

In the injection molding industry, the plastic shell has a certain shrinkage after molding, which will be analyzed from four aspects: molding process, plastic shell structure, mold structure and plastic performance.


1. Influence of molding process on shrinkage of plastic shell

(1) When the molding temperature is constant, the injection pressure increases and the shrinkage decreases;

(2) The shrinkage decreases with the increase of holding pressure;

(3) The shrinkage decreases with the increase of melt temperature;

(4) The higher the mold temperature, the greater the shrinkage;

(5) The longer the holding time is, the smaller the shrinkage is, but the shrinkage is not affected after the gate is closed;

(6) The shrinkage decreases with the increase of cooling time in the mold;

(7) When the injection speed is high, the shrinkage tends to increase slightly, with little effect;

(8) The molding shrinkage is large, and the post shrinkage is small. The posterior contraction was very large in the first two days and stable in about a week. Plunger injection machine has large molding shrinkage.


2. Effect of plastic structure on shrinkage of plastic shell

(1) The shrinkage of thick wall plastic parts is greater than that of thin-wall plastic parts (but the shrinkage of most 1mm thin-wall plastic parts is greater than 2mm, which is due to the increased resistance of the melt in the mold cavity);

(2) The shrinkage of plastic parts with inserts is smaller than that of plastic parts without inserts;

(3) The shrinkage of plastic parts with complex shape is smaller than that of plastic parts with simple shape;

(4) The shrinkage rate of plastic parts in the height direction is generally less than that in the horizontal direction;

(5) The shrinkage of slender plastic parts in the length direction is small;

(6) The shrinkage rate of plastic parts in the length direction is less than that in the thickness direction;

(7) The shrinkage of inner hole is large, and the shrinkage of shape is small.


3. Influence of mold structure on shrinkage of plastic shell

(1) The shrinkage decreases with the increase of gate size;

(2) The shrinkage in the vertical gate direction decreases, while the shrinkage in the parallel gate direction increases;

(3) The shrinkage away from the gate is smaller than that close to the gate;

(4) The shrinkage of plastic parts with mold restrictions is small, and the shrinkage of plastic parts without restrictions is large.


4. Effect of plastic properties on shrinkage of plastic shell

(1) The shrinkage of crystalline plastic is higher than that of amorphous plastic;

(2) Plastic with good fluidity has small molding shrinkage;

(3) After adding filler into the plastic, the molding shrinkage is significantly reduced;

(4) The molding shrinkage of the same plastic is different in different batches.

Copyright: Shenzhen Zhongyuan Plastic Co., Ltd. | mold processing customized manufacturer. If you want to know the processing price of the factory, how much is it, and which is good, please contact us Yue ICP Bei No. 17060480
主站蜘蛛池模板: 欧美激情一区二区三区在线| 18禁裸体动漫美女无遮挡网站| 精品成在人线av无码免费看| 手机看片久久高清国产日韩 | 中国老熟妇自拍hd发布| 日本中国内射bbxx| 成熟人妻av无码专区| 国产福利在线永久视频| 天堂新版在线资源| 男人女人午夜视频免费| 日韩欧美一区二区三区免费观看| 亚洲av无码国产精品永久一区 | 人妻丰满熟妇av无码片| 国产精品久久久久久久久绿色| 国产a级毛片| 国产精品jizz在线观看无码 | 荫道bbwbbb高潮潮喷| 夜鲁鲁鲁夜夜综合视频欧美| 亚洲欧美另类久久久精品能播放的 | 69一区二三区好的精华液| 公和我做好爽添厨房| 国产精品偷窥熟女精品视频| 囯产精品一品二区三区| 好深好大好长好爽18禁| av潮喷大喷水系列无码| 日韩高清亚洲日韩精品一区| 在线观看无码av网站永久免费| 精品亚洲成a人在线观看| 日本护士吞精囗交gif| 好男人视频在线观看免费看片| 亚洲老妈激情一区二区三区| 在线 | 一区二区三区| 亚洲国产美女精品久久久| 国产成人精品无码一区二区| 在教室伦流澡到高潮h强圩电影| 永久免费av网站| 加勒比hezyo黑人专区| 欧美亚洲国产精品久久| 国产精品久久久久永久免费看| 污网站免费| 国产亚洲av无码av男人的天堂 |