Shanghai Daoqin Plastics Co., Ltd.

近 year, compression molding process used for hot solid property mixed material, aldehyde plastics, aldehyde resin, ring oxygen resin, amine resin and in. tube/pipe has 一 材 material can injection molding, using/adopting compression molding process still non 常普遍. pressure use material relatively compression molding use material requirements can property more soft. many hot solid property material tool has high impact resistance grade （1.0ft一lb） and good notched impact strength maintain property, has in pressure lower flow.
compression molding
    hot solid property material compression molding molding obvious advantages is system simple. will material 置入一 add hot type 腔, holding pressure requirements time. process process simple, use less. additives and reinforcement agent random 则, can to relatively good strong/high degree. due to gate and runner, 不浪费材 material, mold 几乎也不 use repair. parts property good, 无铸口 and flow marks, decrease/reduce cost. according to products structure and use plastics application features, can using/adopting full pressure mold, semi pressure mold and 闭模（ can has compression molding mold 方面 文章）.
    equipment: simple is compression molding equipment main features. semi pressure sheet/plate combined in 一起, add temperature, add pressure, will material made formed 预定形状. more compression molding process using/adopting liquid pressure as; has using/adopting gas as. upper lower pressure sheet/plate in pressure lower in 4 角柱 upper upper lower 移动. according to compression molding equipment large small, pressure generally is 20—1000吨. pressure sheet/plate large small generally is 8英寸2 to 5英尺2.
    in add material and solid rear demolding 方面存 in different 自动化程 degree, commonly used most liquid pressure machine 进行. front simple system has temperature degree control, pressure control, pressure control and time control. equipment using/adopting more high grade micro machine control. for/regarding relatively thin products, in sheet/plate in can use add hot or belt/tape add hot device. for relatively deep made parts, need use electrical add hot device, add hot or hot system add hot. has types used for compression molding in add hot system: use add hot mold temperature uniform, add hot temperature degree in 350°F below/following; sleeve/set add hot or its it add hot （ add hot tube/pipe, add hot belt/tape and other ） comparison dry 净, easy maintenance, use comparison and; hot add hot, due to add hot 介质循 ring stability, therefore add hot uniform. in also has many new add hot methods, hot water add hot, similar hot add hot, add hot 介质一 water gas 体燃烧连续循 ring, can provide more high compression molding temperature degree.
    reinforcement modified polymer/macromolecule material industrial development speed, requirements compression molding industrial has new 改进. reinforcement plastics use mold: cationic 模（模塞） and anionic 模（ mold cavity ）. mold reinforcement material 时, for 模 两 semi hot mold combined, rear add hot, add pressure solid to product. versus combined mold complex property very large, can use aluminum, plastics or made 做.
    light material made comparison 便宜, generally used for short production 如“ cold 模塑”. cold use room temperature solid resin, still use mold and compression molding liquid pressure machine. long production use hard mold comparison combined 算, for 截坯口 can provide relatively good property can and excellent light degree. this compression molding using/adopting machine upper 适配 截坯口, usually for clamping 区. use this type of for metal mold, its products surface uniform, light degree good. process used for compression molding molding, pressure molding, injection molding and can pressure reinforcement composite/compounding material.
    thermoplastic plastics can compression molding 模塑, generally also is use mixed hot solid property resin 如BMC（预 made overall plastics ）, SMC（ sheet/slice material molding plastics ）, TMC（ thick plastics ）, sheet/slice molding and other.
    sheet/slice molding has wet molding composite/compounding material, in liquid pressure machine function lower will reinforcement material and resin combined in 一起. in in 放置毡 sheet/slice, will resin in add strong/high material upper. in add pressure process in resin mold cavity add strong/high material solid 定不动.
若 made parts has heavy or degree, has necessary 进行预 molding. more sheet/slice and molding made in 投影面积 upper need add 150—200磅／英寸2 模 pressure.
    mixed material, 如SMC, resin, filler, catalytic agent and reinforcement material formed large small sheet/slice 状, again add hot mold in （ generally 300—400°F ）, in 1000～2000磅／英寸2 pressure lower 模塑.
    used for SMC relatively new compression molding equipment ring cycle can less separation 钟（ from to 尾）. already development use liquid pressure plant/unit compression molding machine in material 筒, control pressure sheet/plate water degree.
   reinforcement plastics, SMC, use metal for compression molding light degree good, this for made parts surface very important. in processing has 时出现 fiber shrinkage.
    use inner coating methods can surface light degree. BMC compression molding process is most 老 预掺 mixed rear process 之一.
filler （木屑, material material, fiber and other ） 掺 mixed mixed combined is in sheet/slice mixed combined device in 进行. will material 装入300～400°F mold in ． in 500磅／英寸2 pressure lower 模塑. use material 廉价, therefore raw materials cost low. due to in process in fiber toward property reduce machine strong/high degree.
    high speed compression molding, reinforcement thermoplastic property plastics sheet/slice 材 冲 pressure, applications 广泛. 玻璃毡 sheet/slice and polypropylene (PP) versus combined used for can pressure plastics, its ring cycle low 于40秒. 生坯送至 for in add hot. add hot rear, 毛坯放入 compression molding mold in, this process use new compression molding machine speed degree can 达1400英寸／ separation 钟. 以 75英寸／ separation 钟（ ratio SMC compression molding process fast 约3倍） add pressure material. according to market requirements, has new can pressure plastics, surface light degree good, and tool has can coating property. pressure generally 1吨／英寸2. compression molding process year 一直呈 growth trend. in technology and national defense application positive in make this type of process toward its difficulty/challenge impact.
    in SMC, BMC, TMC, thermoplastic property sheet/slice 材 冲 pressure, reinforcement material mixed and compression molding machine 械方面 development speed growth, 以适应 industrial new requirements.
    一 先进 掺 mixed material compression molding main/primary is in technology and national defense application development speed. tool and mold new concept and high temperature （达1200°F）模塑 machine, make 石墨一 carbon fiber composite/compounding material development, 代替 现 has metal parts.
high temperature silicon resin positive used as high pressure 介质. composite/compounding material sheet/slice used for compression molding in. in, material and production cost already make process more add 适于空间 technology market, this category of silicon resin very fast toward automotive field/area.
pressure 铸
    in pressure process in, hot solid property resin material add mono material 腔, material 槽, rear strong/high made 送入一 or more in polymerization （ solid 化）.
    material 道, 也叫注道 and runner, make material material from material toward mold cavity, mold cavity front 经 限流 device or gate. very more mold cavity tool has mono material 槽. material in gas by material material 置换, through especially 放置 排 gas 口排出.
    material material material in 时, in 一紧凑 测 amount plant/unit in material amount, rear preheating to polymerization temperature degree. one-time add 入足够 one-time injection molding amount.
    will preheating raw materials material force again will its 送往一注 material device, material device 紧接装 in material upper, anti from active and material between in material. usually will sleeve/set 卡进注 material device 以进一步 anti 漏.
    material 槽, material device, gate, runner and mold cavity surface can make raw materials speed solid 化 一定 temperature degree, according to material material property 质, mold design and made parts 几何形状该 temperature degree is 280～380°F.
    in pressure material to solid 化期 终点时, will 该次完整 pressure material demolding, 包括脱 remove gate, runner, and material in formed solid material 垫（叫做残 material ）.
    in pressure in, material material preheating very important. cold material flow slow, 先进入 mold cavity material to its 终点, can can polymerization. 若发生 upper 述情况, product quality low poor, not only is appearance, 也体现于 mechanical properties. has outer, one-time injection amount very less, or low viscosity material material. can use add hot or add hot, has commonly used methods is use is plastics made 做 介 electrical add hot device.
    in commonly used hot solid property material screw 式塑化 add hot.
    this type of equipment can and equipment combined in 一起, can is 独立, tool has decrease/reduce and for material amount 测定准确 advantages, in its it system in must and molding versus combined.
pressure types type
    “ overall material pressure 铸”一词 most by use, is is material and material is as is mold overall in 一起. most commonly used is material 槽, can can use its it 形状 以适应特殊 gate requirements, less generate waste material.
    types simple compression molding type pressure machine can and pressure machine use. overall material frame is material in in 间 三 sheet/plate type. material 注杆安装 in frame 顶部, mold cavity in 底部.
    material 槽占 面积至 less ratio mold cavity in clamping 面积（ and plastics material water 平面） large 10％. this can anti more clamping force 引起模子溢 material.
    material solid rear, through demolding pressure will made parts demolding, waste material and 注道残 material still by or more 模塑 “鸽尾” maintain in material 杆 底部.
    use or soft remove waste material and 进行清模.
    in use mono material generate large waste material 时, has can use di material toward more mold cavity material. this 时, tube/pipe material weight micro and other, still use sheet/plate balanced material in pressure.
    pressure material pressure mold 也叫注 material mold, it use 一辅助 pressure strong/high material 杆进入 material 槽（ or material 筒）, from material in will material 取出移 to mold cavity in. pressure pressure and pressure speed degree easy control, and clamping pressure 无关.
       compression molding molding for 应 英文 is Compression Molding 　　 compression molding molding （Compression Molding is molding processing in types important technology process, in industrial production, industrial processing in has application, in 人们 生 active in important function. 　　 compression molding molding （Compression Molding is pressure shrink 模塑 简称, also compression molding. plastics or 橡胶胶 material in combined mold cavity inner add hot, add pressure molding is products plastics processing （也 is processing ） methods. generally is will powder 状, 粒状, 团粒状, sheet/slice 状, 甚至先 as formed and products versus 似形状 material 坯, in add hot mold type in, rear add pressure, make its molding solid or 硫化, again demolding products (见图),该 method especially suitable for hot solid property plastics （见 hot solid property resin ） molding processing. disadvantages is production cycle long, efficiency low, products dimensions degree 差.  
       pressure material pressure mold in material large small （决定 waste material large small ） need large to and deep to meet/satisfy positive good add material amount can.
       most large material 槽面积由 pressure machine 辅助柱塞 to force （以吨计） and by 3．5整 remove 确定. this can ensure 3．5吨／英寸2 pressure used as pressure, for/regarding large more pressure grade material formulation, pressure is 足够.
      辅助柱塞 usually in relatively upper solid pressure sheet/plate upper 面, toward lower function. pressure make lower sheet/plate toward upper 移动闭模. 当模夹紧以 rear, raw materials material 槽, 辅助柱塞施 add force. clamping and 辅助柱塞施 add force ratio, generally is 3: 1 or 4: 1.
    material solid rear, 辅助柱塞退回, pressure machine 打开. made parts, waste material, runner cold material meanwhile by demolding 杆送出.
    this type of 铸塑模 一 types deformation is sheet/plate material pressure mold, its in has 一浮动 runner sheet/plate will material material separation to toward mold cavity material material in.
    method suitable for clamping can runner 方, or in clamping 线平面 upper type 芯, made parts non 常不规则而十扰侃迈布置 万.
特殊 design pressure machine has below/following types type type:
1）底挤 material pressure mold in pressure machine in, its in 辅助柱塞安装 in clamping in, or more pressure mono between has 足够 空间, 则该辅助柱塞安装 in lower pressure sheet/plate upper.
this type of methods advantages in 于, mold 打开时 can toward material in material.
this type of design ratio in toward material material front and other 待闭模 design fast. and 辅助柱塞 冲程 can shrink short, 每一循 ring can 节约数秒钟 time.
use upper pressure machine can use 顶柱塞注 material pressure mold, pressure material need for 准, ensure material very good material 槽, 否则闭模困 difficult.
2） belt/tape has toward more material material more 辅助柱塞 pressure machine, tool has can more mold cavity, generate waste material and need efficiency low long bending runner.
3） small type use powder material pressure machine can pressure 铸, can water as can 垂直操 as, has and clamping 柱塞垂直 辅助柱塞, used for raw materials clamping material.
4） for made overall plastics （BMC）, usually is glass fiber filling polyester, has water pressure machine, belt/tape has material parts can will material pressure 实, again pressure material 筒.
5） pressure machine is hot solid property resin injection molding machine type. this type of machine will screw and preheating mold combined in 一起.
preheating rear material 送往模塑 clamping or has lower 面 庆铸 material in.