PVC发泡板平模头在国内的应用和发展史

PVC发泡板模具在国内应用和发展大致可以分为如下几个阶段：
1. 进口生产线自由发泡板模具时期free
foam board mould on imported produce line
2. 进口生产线真结皮发泡板模具时期
true crust foam board mould on imported produce line

3. 国产生产线自由发泡板模具时期
free foam board mould on domestic produce line、
4. 假结皮发泡板模具时期
false crust foam board mould
5. 带预冷板的结皮发泡板模具时期
crust foam board mould with pre-cooling bar、
6. 无阻流棒模口弹性微调的结皮（和自由）发泡板模具时期
crust (& free) foam board mould without choke bar.