Shanghai Daoqin Plastics Co., Ltd.

 一, hot runner history, in, future

hot runner system （hot runner systems）起源于 injection molding industrial in runner system, as is 一项先进 plastics injection molding processing technology, in 西方发达国家 普 and use can to upper in 期甚至 more 早. hot runner tool has many advantages, therefore, in outer development comparison fast, many plastics mold production mold 50% above using/adopting hot runner technology, separation mold 厂甚至达 to 80% above . in China, this technology in year true positive comprehensive and application, mold industry development, hot runner in plastics mold in use ratio/proportion 也逐步 improve/increase, 但总体 upper also to outer hot runner mold ratio/proportion.

in recent years, hot runner technology in China 逐渐推广, this very large degree upper is due to mold toward company export volume fast speed development belt/tape. in USA 家, injection molding production already 经依赖于 hot runner technology. can this 样说, has use hot runner technology mold in already very difficult export, this formed very more mold for/regarding hot runner technology upper 转变.

图1 图 sheet/slice 拍摄于广州橡塑展期间

二, hot runner principle

cold runner is mold and product gate between separation. plastics in runner inner injection molding pressure and its hot amount maintain flow 状态, runner as is molding material material separation, 但并不 belongs to product. therefore in design mold 时候既 need filling 效果, also need how to through shrink short, shrink small runner 节省材 material, 理想情况 is this 样, 但实际 application in very difficult to full its 美.

图1 图 sheet/slice 拍摄于广州橡塑展期间

hot runner also runner is in injection rear runner in plastics solid, plastics product demolding 时就不必 will runner in water 口脱出. due to runner in plastics has solid, therefore in lower one-time injection runner still 然畅通. brief 言之, hot runner is injection molding machine nozzle 延伸.

三, hot runner mold features

is what has this type of hot runner technology 出现呢? hot runner technology also can belt/tape to which benefits 呢? injection molding process engineering 人员都知道, injection molding 经常会 has below/following factors 出现:

a.  filling difficult; b.  thin large made parts easy deformation; c. 浇道 Raw Materials 浪费; d.  more mold cavity mold injection molding parts quality and other.

hot runner technology 出现, to this issues provide comparison solutions, generally 讲, using/adopting hot runner has below/following benefits:

1, hot runner mold advantages

■ shrink short made parts molding cycle

因没 has system cooling time made, made parts molding solid rear can and ejection. many use hot runner mold production thin small parts molding cycle can in 5秒钟 below/following.

■节省 plastics raw materials

in full hot runner mold in has cold 浇道, therefore production material. this for/regarding plastics price application project especially heavy large. upper, upper main/primary hot runner production 厂商均 in world upper and plastics raw materials price year to development. is hot runner technology is decrease/reduce waste material reduce Raw Materials use has 效途径.

■ decrease/reduce waste product, improve/increase product quality

in hot runner mold molding process in, plastics melt temperature degree in runner system to control. plastics can more is uniform 一致 状态流入各 mold cavity, its is quality parts. hot runner molding parts gate quality good, demolding rear residual stress low, parts deformation small. therefore market upper very more high quality product hot runner mold production.

■消 remove rear 续工序, has production 自动化

made parts hot runner mold molding rear is formed product, 无需修剪 gate and recycling processing cold and other 工序, has production 自动化. inner outer very more product production 厂家均 will hot runner and 自动化结 combined 起 以 large degree improve/increase production efficiency.

■ expand large injection molding process application scope

many plastics molding process is in hot runner technology upper development 起. 如PET预 molding manufacturing, in mold in more color 共注, multiple material process, STACK MOLD and other.

图3 一出八无 gate hot runner preform mold

2, hot runner mold disadvantages

尽 tube/pipe and cold runner mold versus ratio, hot runner mold has many significantly advantages, mold use need understanding hot runner mold disadvantages. 概括起 has below/following 几点:

▲ mold cost upper rise

hot runner parts price comparison 贵, hot runner mold cost can can large degree increase high. if parts output/production volume small, mold tool cost ratio/proportion high, upper 不划算. for many development China mold use 户, hot runner system price is effect/influence hot runner mold use main/primary issues 之一.

▲ hot runner mold made as process equipment requirements high

hot runner mold need precision processing machine as ensure. hot runner system and mold formed and combined requirements is 严格, mold in production process in 会出现 very more heavy issues.

▲操 as repair complex

and cold runner mold versus ratio, hot runner mold as repair complex. use as 不当极 easy loss bad hot runner parts, make production method 进行, formed large loss 失. for/regarding hot runner mold new use 户, need relatively long time use experience.

四, hot runner system formed

尽 tube/pipe world upper has many hot runner production and multiple hot runner product series, 但一 典 type hot runner system 均由如 lower large separation formed: hot runner sheet/plate, nozzle, temperature degree control device, parts .

图4 hot runner separation sheet/plate - hot 流道 temperature cable 线

一 formed hot runner mold application project need more step/link 予以保障. its in most important has technology factors: 一 is plastics temperature degree control; is plastics flow features control .

★ plastics temperature degree control

in hot runner mold application in plastics temperature degree control is important. many production process in processing and product quality issues 直接 源于 hot runner system temperature degree control good. use 鱼雷式 hot gate injection molding product gate quality issues, hot molding 时阀针完 full 关闭困 difficult issues and more type mold in parts filling time and quality 不一致 issues. if can can, amount selection tool more separation temperature hot runner system, increase use active property and can force.

★ plastics flow control

plastics in hot runner system in need flow balanced. gate need meanwhile make plastics filling type 腔. for/regarding parts weight versus 差悬殊 need 进行浇道 dimensions design balanced. 否则就会出现 has parts holding pressure 不够, has parts 却充模 holding pressure degree, flash large quality and other issues. hot runner dimensions design need combined 理. dimensions small pressure loss large. dimensions large hot runner large, plastics in hot runner system in time long, bad material property can 而导致 parts molding rear can meet/satisfy use requirements