Shanghai Daoqin Plastics Co., Ltd.

TPU材 material is through rigid property styrene 链段嵌 in butadiene 链段两端, made butadiene 无定形橡胶 features, 赋予材 material normal temperature can type 态, therefore TPU线材 in normal temperature lower 呈现橡胶 high elastic and plastics can type property.

橡胶 structure in rigid property 链段, is flexible 异戊二烯链段组 formed, in 未硫化 front is 无定形态, tool has use property, through agent, promote agent function, crosslinked formed structure, made 异戊二烯 无定形态, formed is types high elastic property 恢复, high modulus, high wear resistant, comprehensive property can excellent elastic property material.

1, temperature degree

模塑TPU process need control temperature degree has material temperature degree, nozzle temperature degree and mold temperature degree. front types temperature degree main/primary effect/influence TPU and flow, rear types temperature degree effect/influence TPU flow and cooling.

a． material temperature degree

material temperature degree selection and TPU hardness has 关. hardness high TPU熔 melt temperature degree high, material 筒末端 most high temperature degree high. processing TPU use material temperature degree scope/range is 177~232℃. material temperature degree distribution generally is from material 斗一侧 rear 端）至 nozzle front 端）止, rise high, make TPU temperature degree upper rise to uniform 塑化 目.

b． nozzle temperature degree

nozzle temperature degree usually low material most high temperature degree, anti material in 直通式 nozzle can can 发生 流涎 phenomenon. if is 杜绝流涎而 using/adopting 自锁式 nozzle, nozzle temperature degree can control in material most high temperature degree scope/range inner.

2, time

完 formed one-time injection process time is molding cycle. molding cycle 包括充模 time, holding pressure time, cooling time and other time mold opening, demolding, and other ）, effect/influence production rate and equipment utilizing rate. TPU molding cycle usually 决定于 hardness, made parts thick degree and type, TPU hardness high cycle short, parts thick cycle long, parts type complex cycle long, molding cycle also and mold temperature degree has 关. TPU molding cycle generally in 20~60s between.

3, injection speed degree

injection speed degree main/primary 决定于TPU products type. thick products need relatively low injection speed degree, thin injection speed degree relatively fast.

4, screw speed

processing TPU products usually need low speed rate, 因而以 relatively low screw speed is 宜. TPU screw speed generally is 20~80r/min, excellent 选20~40r/min.

鼎誉 is 一家集 R&D, production, sales and is 一体 现代化专业化 office enterprise. company 秉承“立足科技 innovation, technology R&D, product quality ” 原则, force toward provide from TPU, TPEE to TPE, TPV full elastomer solutions.