欧美大片aaaaa免费观看,精品久久久久久中文字幕202,极品少妇XXXXⅩ另类,国产精品久久久久久亚洲

Bubble and vacuum bubble defect analysis and elimination method
Release time:2021.08.30  News sources:Ningbo Dione

What are Bubbles and vacuum Bubbles (Bubbles) defects?




Bubbles and vacuum Bubbles (Bubbles) defects, because the center of the wall thickness of the product cooling is the slowest, the surface of the product cooling rapidly, the rapidly shrinking surface will pull the material over, the uneven volume of the molding product shrinkage caused by the thickness of the part of the hole, the water or gas in the plastic bubble becomes a bubble. Bubbles can be divided into bubbles and vacuum bubbles. Generally speaking, bubbles occurring on transparent products can be directly observed, while bubbles occurring on opaque products can sometimes not be seen from the outside and can only be found by cutting them open or other means. The appearance of bubbles will make the product filled, uneven surface. As shown in figure: Bubble and vacuum bubble (Bubbles) defect analysis and elimination method




1) Improper control of forming conditions




Many technological parameters have a direct effect on the formation of bubbles and vacuum bubbles. If the injection pressure is too low, the injection speed is too fast, the injection time and cycle are too short, the amount of feed is too much or too little, the pressure holding is insufficient, the cooling is not uniform or insufficient, and the material temperature and mold temperature control is improper, will cause bubbles in the plastic parts. Especially when high-speed injection, the gas in the mold can not be discharged, resulting in too much residual gas in the molten material. Therefore, the injection speed should be appropriately reduced. However, if the speed drops too much and the injection pressure is too low, it is difficult to exhaust the gas in the molten material, and it is easy to produce bubbles, depressions and underinjection. Therefore, the injection speed and pressure should be adjusted with special caution. In addition, bubbles and vacuum bubbles can be avoided by adjusting the injection and pressure holding time, improving the cooling conditions and controllin

In good faith, quality and quantity, credibility first
We are willing to cooperate with domestic and foreign merchants for mutual benefit and create a better future for China's light source business!

Discuss business cooperation
娇妻被交换粗又大又硬视频| 日韩一卡2卡3卡4卡| 国产亚洲美女精品久久久久| 国产va免费精品高清在线30页| 亚洲av无码专区在线电影成人| 绿巨人www网在线观看免费版| 色老二导航| 亚洲国产精品嫩草影院永久| 亚洲av无码一区二区三区观看| 最近中文字幕mv免费视频| 夜夜澡天天碰人人爱av| √天堂www最新版在线中文| 成免费CRM直接看| 看全色黄大色黄大片 视频| 中文字幕亚洲无线码在线一区| 特黄做受又粗又大又硬老头| 成人特级毛片免费观看| 99久久久久99国产免费AV| 放荡的护士hd在线观看| 亚洲 综合 校园 欧美 制服 | 码亚洲中文无码AV在线| 无码aⅴ精品一区二区三区| 日产乱码卡一卡2卡三卡四颐和园 国产亚洲欧美在线精品电影 | 日本公妇在线观看中文版| 野花社区在线观看www| 最近2019年好看中文字幕视频| 肥白大屁股bbwbbwhd| 欧州办公室内射美女| 国产人妻久久精品二区三区特黄| 亚洲视频日韩视欧美视频| 99久久国产精品热88人妻| 另类国产精品一区二区| 无码人妻精品一区二区三区免费| 女性喷液过免费视频| xxxx性bbbb欧美| 日韩精品免费一线在线观看| 亚洲午夜无码极品久久| 久久先锋男人AV资源网站| 琪琪电影网午夜理论片717西瓜| 小蜜被两老头吸奶头| 精品成人一区二区三区四区 |