T-PBT001 Environmental Friendly Flame Retardant Polybutylene Terephthalate PBT Plastic Granule Raw Material Coating Material

Shanghai Gengyun Industrial Co., Ltd

Technical Parameters

Polybutylene Terephthalate PBT Plastic Technical Parameters：

Serious No

Description

Unit

YD/T 1118.1-2001 Our products Value

Appearance

Cream white,pale yellow,colorless &transparent granular

Density

g/cm

1.25~1.35

1.31-1.33

Moisture content

≤0.1

≤0.05

Melting index(250ºC/2.16kg)

g/10mi

7~15

Saturated ratio of moisture content

≤05

≤0.3

Tensie Yield strength

MPa

≥50

≥55

Yield elongatior

5~10

Elongation at break

≥100

≥150

Tensile modules ofelasticity

MPa

≥2100

≥2400

Flexural modules of elasticity

MPa

≥2200

≥2500

Flexural strength at 3.5%of strain

MPa

≥60

≥70

Shore hardness HD

≥70

≥75

Melting point

ºC

220~230

Coefficient of linear expansion(23-80)

10-4K-1

≤2.0

≤1.0

Compatibility with filling petroleum jelly

MPa %

≥50

Tensile yield strength Yield Elongation at break

≥100

≥150

Volume resistance

Q.cm

≥1×1015

≥2.0×10

Production Process Parameters

Polybutylene terephthalate PBT Plastic of the standard YD/T 1118.1-2001 Material used for fiber secondary coating.

Processing Technical Parameters

Instructions

1. The setting of processing technical parameters of PBT Coating Material products is depending on the structure of extruder screw and its ength-diameter ratio;

2. The first stage of cooling water temperature setting is determined by the customers in accordance with their request to control the final excel length of the optic fibers;

3. The production line speed is set according to the rheological property of the PBT material itself.

1. Diagram of Extruder Screw:

Diagram of Extruder Screw

2. Structures of Extruder Screws: Ordinary extruder screw and BM extruder screw
3. Principles for Temperature Setting
a) Ordinary Extruder Screw: To follow the principle of “Lower at two ends and higher in the middles”, for example:
Zone 1: 240 – 245ºC Zone 2: 255 – 260ºC Zone 3: 255 – 260ºC Zone 4: 250 – 255ºC
b) BM Extruder Screw: On the principle of “Higher at two ends and lower in the middles”, for example:
Zone 1: 260 – 265ºC Zone 2: 250 – 255ºC Zone 3: 250 – 255ºC Zone 4: 255 – 260ºC
4. Basis of Rational Judging for Temperature Setting:
After setting a certain production line speed (the tractive speed), observe the motor load of the extruder to check whether the load value is floating within +/-5% of it. If so, the production could start on a normal scale. If not, slightly adjust the setting temperatures at Zone 2 and Zone 4 in order to meet with the extruder main motor load floating in the range of +/-5% of it.

Processing Technical Parameters

Temperature Setting of Cooling Water at the First Stage
Temperature setting of cooling water at the first stage for Series DH products depends on the customers’ request to finally control their excel length of optic fibers. Because the glass transforming of normal PBT is happened under the turning temperature value Tg among 37-45ºC, it should set the temperature of cooling water at the first stage within the range of 35 – 50ºC; However it must be noticed that in consideration of the environmental temperature changing with the weather of all the year round, the temperature setting value of the cooling water at the first stage should be slightly adjusted in a proper way so as to keep the control of excel length of optic fibers stable.
Production Speed (Tractive Speed)
The production speed (tractive speed) is decided by customers in accordance with the rheological property of PBT itself.
The production speed (tractive speed) with 100-550 m/min is recommended by our company.
The rheological curves of Series DH products are as follows:

rheological curves of Series DH products

accordance with the rheological curves (Shearing Viscosity – Shearing Rate) of Series DH products, our company recommends the best proper processing technical parameters as follows:
1)Processing temperature ranges: 240-70ºC;
2)Rate of extruder screw: media rate;
3)Production speed (tractive speed): 100-550 m/min

2. Structures of Extruder Screws: Ordinary extruder screw and BM extruder screw 3. Principles for Temperature Setting a) Ordinary Extruder Screw: To follow the principle of “Lower at two ends and higher in the middles”, for example: Zone 1: 240 – 245ºC Zone 2: 255 – 260ºC Zone 3: 255 – 260ºC Zone 4: 250 – 255ºC b) BM Extruder Screw: On the principle of “Higher at two ends and lower in the middles”, for example: Zone 1: 260 – 265ºC Zone 2: 250 – 255ºC Zone 3: 250 – 255ºC Zone 4: 255 – 260ºC 4. Basis of Rational Judging for Temperature Setting: After setting a certain production line speed (the tractive speed), observe the motor load of the extruder to check whether the load value is floating within +/-5% of it. If so, the production could start on a normal scale. If not, slightly adjust the setting temperatures at Zone 2 and Zone 4 in order to meet with the extruder main motor load floating in the range of +/-5% of it.
Processing Technical Parameters
Temperature Setting of Cooling Water at the First Stage Temperature setting of cooling water at the first stage for Series DH products depends on the customers’ request to finally control their excel length of optic fibers. Because the glass transforming of normal PBT is happened under the turning temperature value Tg among 37-45ºC, it should set the temperature of cooling water at the first stage within the range of 35 – 50ºC; However it must be noticed that in consideration of the environmental temperature changing with the weather of all the year round, the temperature setting value of the cooling water at the first stage should be slightly adjusted in a proper way so as to keep the control of excel length of optic fibers stable. Production Speed (Tractive Speed) The production speed (tractive speed) is decided by customers in accordance with the rheological property of PBT itself. The production speed (tractive speed) with 100-550 m/min is recommended by our company. The rheological curves of Series DH products are as follows: