Some Knowledge Of "Plasticizing Degree" In The Production Of PVC Products

August 21, 2017

1.The influence of plasticizing degree on the performance of the product:


The performance of PVC products is closely related with the degree of
plasticization, plasticizing degree, brittle hair products, mechanical
properties can not meet the requirements; the plasticizing rate is too high,
products will appear yellow line, the mechanical properties are not qualified,
is very important in the process of plasticizing degree of PVC products in.


1)when the plasticizing degree is 60%, the tensile strength is the highest;


2)when the plasticizing degree is 65%, the impact strength is the highest;


3)when the degree of plasticization is 70%, the elongation at break is the
highest;

 

For the production of water supply pipe material, plasticizing degree of 60-65%
is the most appropriate. Because in this range, it can show two properties of
tensile strength and impact strength.

 2.Influence of temperature on ductility:


Polymer materials cannot be melt at lower than 80 DEG C, a glass, glass
material that is hard and brittle, in glassy materials can not be processed;
with the increase of temperature to 160 DEG C when the materials in the high
elastic state, but in the area of material or not flow, can only make the
material become soft, viscoelastic increase; and really can reach PVC, the melt
processing flow, the temperature should be 160-200 degrees, but for any long-
term heat stabilizer, at a temperature above 200 DEG C, and the material
decomposition,Therefore, when controlling the plasticizing degree, the
temperature can only be controlled between 160-200 degrees centigrade. In the
temperature range of 40 DEG C, when the temperature of PVC is set at 170-180
DEG C, the plasticization is better.

 

3.Improve the degree of plasticizing method:


1)by increasing the temperature of the fuselage and screw.


2)when the screw speed is normal, the feeding rate of the feeder is increased
to improve the plasticizing degree


3)in the extruder rated speed and meet the feeding conditions, improve the
extruder speed.


The role of ripening period:


1)Eliminate static electricity and reduce pollution


2)increase the apparent density


3)increase plasticizing degree


4)low molecular polymerization, uniform dispersion, to prevent extrusion
instability.


5)increase the partial plasticization by reducing the temperature of the
confluence core.

 

4.how to determine the degree of plasticization:


1)through the host current to determine the degree of plasticization, (65/132
production line as an example, the host current to 46-52A is appropriate, if it
is low calcium products, 45-50A is appropriate. The premise is that the screw
speed is 16~22r/min, the feed is full and matched with the screw speed, the
temperature setting is matched with the screw speed and the host current;


2)Observe the plasticizing degree of the material through the vacuum vent of
the main engine (that is, the material is filled with more than 60% in the
middle of the screw flange, and the powder in the spiral groove is bean curd
slag and the material at the bottom of the groove is flattened);

 

3)Determine the plasticizing degree by the viscoelasticity of the melt material
in the die;


4)the degree of plasticization is determined by the melt pressure and melt
temperature of the confluence core. The disadvantages are that if the
instrument fails or the core of the mixed sensor is burnt, the accuracy of the
result will be affected.

 

Tongxiang long Cheng Plastic Co., Ltd. has nearly 20 years experience on PVC
granule research,development and granulation production. Professional and
technical service team can provide one-stop system solution for customers. 

 

For more information about products, please visit our website: www.lcpvc.com. 

 

consult online customer service or call the hotline,Tel: +86 0573-8861 8323.

 

Email:sales@lcpvc.info

 

We are waiting for your visit and giving you best service.

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