Shanghai Daoqin Plastics Co., Ltd.

l, overview
模 pressure molding process is plastics mold 塑 property material most Common, history most molding methods 之一, and is research material property can most using/adopting types process methods. it tool has molding plant/unit simple, equipment investment small, mold structure simple and other features, in machine 械化, 自动化 production high degree 发达 今天, still is types most is and production 手段之一. however, pressure shrink molding mold design can 参考 文献 remove 教科书, front 辈 著 专著, mold design 图例以 outer, less has summary mold design in key/critical tips/techniques.
mold add hot, temperature and cooling and structure is composite/compounding material mold design can or 缺 一部 separation. structure design effect/influence to product appearance and inner in quality uniform property, meanwhile also effect/influence product molding efficiency.
2, add hot, temperature and cooling design
2．1 add hot tube/pipe design requirements
钢 made add hot is has plastics molding mold design must using/adopting add hot 手段, can design is mono toward 接线, di toward and other multiple 形式, upper can using/adopting has tube/pipe, tube/pipe, 不锈钢 tube/pipe and other, features is hot loss small, hot efficiency high, simple, can according to need design is 220V or 380V, is active more 样. due to its material and processing process made, mold design in need attention/notes it toward features.
（l） add hot tube/pipe in usually has relatively long cold 端, can to add hot function.
（2） add hot 段 功 rate design amount ultra- 10瓦特／ cm made. 如30 cm long add hot tube/pipe, rate can can need ultra- 300瓦. if design rate ultra- this made, add hot tube/pipe surface negative relatively high, tube/pipe easy oxidation 腐蚀, formed short 路.
（3） for/regarding temperature degree high 于250℃ mold design, using/adopting add hot tube/pipe has difficult degree. 我曾经 utilizing add hot tube/pipe rise temperature to 420℃, is this type of molding temperature degree for add hot tube/pipe quality requirements relatively high, need 经常检查 electrical 路 通畅 and short and 否. is this type of conditions lower add hot tube/pipe, 接线端子, use copper 线, sheet/slice and other non easy oxidation, from 而导致断路. therefore for electrical 传输介质 need 进行特殊处理, amount make conductive 线暴露 in gas in, long use lifespan.
烙 iron usually by as is mold add hot tube/pipe types, features is mono long degree rate high （ usually 直径10mm, long 8cm specifications iron can to 150瓦 输出功 rate ）, resistant use, safety property good, easy formed short 路, can through 钻盲孔 埋设, disadvantages is difficult made design, 拆换时 easy 碎, 断.
electrical design in can less 保险, gas and other measures, as need maintain dry 净整洁, insulation good, as in 勤于检查 electrical fault/failure, anti necessary 危险.
2．2 add hot tube/pipe 安装钻孔
from hot degree upper understanding, add hot tube/pipe need and mold surface can can combined, 以利于 add hot tube/pipe hot amount fast to mold upper. 而实际 upper add hot tube/pipe and mold has more large 接触面积, hot essence is 辐射, is need. therefore large separation used for mold add hot tube/pipe surface coating has reinforcement outer coating, meanwhile using/adopting made design rate （10瓦特／ cm ） 办 method growth add hot tube/pipe use lifespan.
therefore in processing add hot tube/pipe 孔时, especially is long add hot tube/pipe processing necessary design small combined 间隙, has design methods is in 孔 两端尽 can can can and add hot tube/pipe 严密配 combined, can using/adopting 填塞, or design sheet/slice and other method. this type of method can has decrease small add hot tube/pipe dispersion hot 面积以 and hot amount loss 失.
2．3 add hot tube/pipe 埋放
埋放 add hot tube/pipe, most good using/adopting and tube/pipe inner same oxidation powder 进行充填, reduce add hot tube/pipe surface hot negative 荷, this type of methods can decrease/reduce tube/pipe surface oxidation, has long tube/pipe use lifespan. has conditions 话, add hot tube/pipe 安装孔也 most good oxidation powder.
2．4 mold temperature methods
add strong/high mold temperature measures can decrease/reduce mold hot loss 失, can make mold in relatively short time inner to production temperature degree, decrease/reduce can 源浪费. engineering technology for this issues has sleeve/set solutions, 我 谈谈我 experience.

POM plastics raw materials POM/511P/ USA DuPont
2．4．l add hot sheet/plate temperature measures
add hot sheet/plate temperature usually using/adopting sheet/plate or 石棉布保 temperature, 但石棉布不 easy 摆放平整, for pressure sheet/plate degree ensure has effect/influence. sheet/plate types type very more, most Common is 橡胶石棉 sheet/plate, this type of sheet/plate for used for thermal insulation use material, tool has can pressure grade 胜, meanwhile in high temperature 时会释放出一 types separation difficult odor, effect/influence as ring and as 人 身体健康.
add hot sheet/plate temperature using/adopting 石棉纸 sheet/plate, Common specifications is 1000×1000, 3－5mm thick, sheet/plate relatively is 规整, degree relatively good, can pressure shrink property comparison 平均, high temperature lower 无异味 generate.
2．4．2 mold temperature measures
mold temperature measures very more, can use 石棉布 or 玻璃布包裹 hydrogen oxidation aluminum temperature 棉进行保 temperature. in market upper also has types temperature coating material is currently used as mold temperature 理想材 material, it in long fiber, material and types temperature foam material mixed combined formed, viscous property in, easy coating 抹. this type of material used as chemical industry, pipeline temperature material, alkali property （ easy mold ）. in 150℃ conditions lower use 没发现 has 烧焦, 熔化, odor and other negative effect/influence. meanwhile material very light, can property relatively strong/high, easy formed relatively is mold surface.
2.5 mold cooling methods
water cooling is large more mold using/adopting cooling methods, has its disadvantages; requirements pipeline property

need good, upper lower water tube/pipe must 通畅, for water 资源 浪费 relatively large. cooling temperature degree ultra- 100℃时, easy generate 蒸汽爆炸. advantages is hot relatively large, can achieve fast speed drop temperature.
风 cooling is types comparison cooling methods, and water cold positive versus 反, it need pipeline 密封, in 资源浪费, can cooling temperature degree high 于100℃ mold, can through gas 体 流 amount cooling speed degree, and 源简洁方便, has 一定规模 production workshop can comparison gas 源.
3, mold 装夹
mold structure and mold add hot, temperature and cooling system related, meanwhile is mold more 换, provide 一定 方便 features. more design is 图方便, simple will mold upper several 安装孔 use solid 定. is more pressure 模都不 mono design add hot plant/unit, is in pressure machine upper lower pressure sheet/plate upper add hot sheet/plate 以简化 in small type mold processing. mold structure in 就 剩 lower molding 腔主体 structure block. this mold can using/adopting injection molding mold solid method —— use pressure sheet/plate will mold solid in upper lower sheet/plate upper. in add hot sheet/plate mold upper design good solid pressure sheet/plate 空间即 can. this type of design not only can used for 移动式 pressure 模, can used for belt/tape has simple machine pressure 模. need in add hot sheet/plate design in 才考虑 to 顶杆 位置 and add hot tube/pipe versus 冲突即 can. can utilizing types mold for more mold general purpose property renovation, 以简化 mold manufacturing cost.
if mold relatively high, mono pure add hot sheet/plate add hot already can meet/satisfy uniform add hot need, this need in mold upper 安装辅助 add hot system, can add hot sheet/slice, add hot tube/pipe and iron formed.
for/regarding structure simple, dimensions relatively small mold, using/adopting add hot sheet/plate add hot formed large hot amount loss 失, in mold design simple add hot system can meet/satisfy requirements. need attention/notes is in mold and pressure machine solid sheet/plate between need add thermal insulation material （ usually using/adopting 石棉纸 sheet/plate ） 保 temperature, meanwhile need attention/notes electrical 源线 排布整齐 and electrical 偶孔 位置. this type of 设）; due to hot relatively small, especially suitable for need add hot cooling or fast speed add hot cooling small type mold.
4, 结语
本文 is engineering application in summary, 经实践文 in and multiple tips/techniques and method can 行.