SUNPRENE　成　型　工　艺
　　
　　 正如我们所知，适合软质PVC的成型方法对于SUNPRENE都是适用的，也就是说挤出成型，注射成型，吹塑成型，压制成型，压延成型都适用。但是，由于SUNPRENE热融体粘度较高，成型时最好用剪切力大一占的成型设备。

挤出成型
　　一般可采用适用于普通软质PVC挤出机的设备比较好。一般来说，推荐成型条件如下：
　　-3段螺杆
　　喂入区：3-5D
　　压缩区：15-17D
　　混合区：4-6D
　　-螺杆长度：22-28D
　　-压缩比：3-4
　　对于邵氏硬度在65-70的SUNPRENE，在65mm挤出机中，标准湿度设定如下：
　 　　　Z1 　　Z2 　　Z3　　　Z4 　　　　Head 　　　Die
　　℃　130 　　140　　150　 　160　　　　165　　　　170
　　螺杆末端的滤网有利于提高剪切力（2×80目滤网）。
　　以上参数针对一般情况。特殊情况须区别对待。

注射成型
　　一般可采用适用于普通软质PVC注塑设备比较好。
　　注射口和喂入通道要稍微大一点。注射压力要高（850bars）。模具温度根据成品表面光泽要求来定。（一般为40-50℃）

　　As we have already seen,all processing techniques which are used for flexble PVC applicable to SUNPRENE.That means,injection moulding,extrusion,blow moulding,calendering and press molding.
However,the hot melt viscosity being high,it is better to process the SUNPRENE on machines proving enough shear force.

EXTRSION MOULDING
　　Machines used to extrude ordinary plasticized PVC are usually considered satisfactory.
In general,following processing conditions are recommended:
　　-3 zone screw:
　　feed zone:3to5D
　　compression zone:15to17D
　　Metering zone:4to6D
　　-Screw length:22to28D
　　-Compression rate:3to4
　　Standard temperature settings for a 65mm extruder and for a SUNPRENE grade of 65 to 70 shores hardness are:
　　 　　Z1 　　Z2 　　Z3　　　Z4 　　　　Head 　　　Die
　　℃　130 　　140　　150　 　160　　　　165　　　　170
　　Filtration at the end of the screw may be useful it increase shear(2×80 mesh filter).
there figures are given for general information and must be adapted to special cases.

INJECTION MOULDING
　　Flexible PVC standard moulding machines are usually considered satisfactory for the moulding of SUNPRENE.
　　Injection gates and feed channels should be slightly over-sized.Higher injection moulding pressure are desirable(ie above 850 bars).Moulding tempertures can be adapted in order to achieve the deired surface finish(these are generally around 40-45℃).