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The development history of flat die head of PVC foam board in China -- 1

      

       As we all known, due to plastic extrusion molding is completed inside the T-die, then the t- die design and the quality of t-die is directly determine the quality of products. 

      Last time we simply summarized six periods of history of PVC foam board flat die head in the China market. Today, we ganna share the first three periods in detail.


A.   Stage of free foam board mould on imported produce line

In 1990s, the three roller produce line was imported into China, and was used to produce free foam board. The screw and mould in PVC foam board produce line are wearing parts. If the user chose to change new parts, the imported price was very expensive. If user chose to repair damaged parts, the repairing would cost too much time and money. So the user asked some company with enough technology to study, repair and make the screw and mould. It is earlier stage of making PVC free foam board mould in China.

Please see the picture below of PVC free foam board mould

 


This kind of board which is made by free foam board produce line and mould is light. Its surface hardness is not high, and nail-holding ability is bad. This board is just suitable for AD industry.

B.   Stage of true crust foam board mould on imported produce line

The end of 1990s and beginning of 2000s, some domestic parallel double-screw extruder true crust produce line, and double flow channel true crust mould was be used. The board which is from this kind of produce line and mould has hard surface, good nail-holding ability. It can be sawed, planed, drilled, and nailed. In the mean time, the PVC board is waterproof, fireproof, and mothproof, so it can be used to replace wooden board.

Please see the picture below of true crust foam board mould

 


C.   Stage of free foam board mould on domestic produce line

Either free foam board produce line or true crust foam board produce line must be imported in earlier time. The imported produce line was expensive, and the wearing parts needed too much time and money to repair and replace. So in 1980s and 1990s, some domestic plastic machinery manufacturer started to make plastic extruder. At that time, most of extruder is with single screw. Then, according to the experience of imported conical double-screw extruder produce line (at that time, calcium powder is less in stuffing), domestic manufacturer changed the structure of conical double-screw extruder and increase the calcium powder to make plastic. So the domestic conical double-screw extruder started to be used to make free foam board, and China entered the stage of conical double-screw extruder produce line with free foam board mould.

Please see the picture below of PVC free foam board mould

 


The next there periods, we gonna share next time.


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