TECHNICAL PARAMETERS OF PBT
| Serious No |
Description |
Unit |
YD/T 1118.1-2001 Our products Value |
| |
Appearance |
|
Cream white,pale yellow,colorless &transparent granular |
| 2 |
Density |
g/cm |
1.25~1.35 |
1.31-1.33 |
| 3 |
Moisture content |
% |
≤0.1 |
≤0.05 |
| 4 |
Melting index(250ºC/2.16kg) |
g/10mi |
7~15 |
7~15 |
| 5 |
Saturated ratio of moisture content |
% |
≤05 |
≤0.3 |
| 6 |
Tensie Yield strength |
MPa |
≥50 |
≥55 |
| 7 |
Yield elongatior |
% |
5~10 |
5~10 |
| 8 |
Elongation at break |
% |
≥100 |
≥150 |
| 9 |
Tensile modules ofelasticity |
MPa |
≥2100 |
≥2400 |
| 10 |
Flexural modules of elasticity |
MPa |
≥2200 |
≥2500 |
| Flexural strength at 3.5%of strain |
MPa |
≥60 |
≥70 |
| 11 |
Shore hardness HD |
|
≥70 |
≥75 |
| 12 |
Melting point |
ºC |
220~230 |
220~230 |
| 13 |
Coefficient of linear expansion(23-80) |
10-4K-1 |
≤2.0 |
≤1.0 |
| 14 |
Compatibility with filling petroleum jelly
Tensile yield strength Yield Elongation at break |
MPa % |
≥50
≥100 |
≥50
≥150 |
| 15 |
Volume resistance |
Q.cm |
≥1×1015 |
≥2.0×10 |
Applied standard: Part1:Polybutylene terephthalate 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 PBTproducts 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.
Setting of Temperatures1. 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:
In 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
Package
There are two kinds of Dehong's packing for PBT compound:
1. Jumbo Bag:
The jumbo bag is combined by two layers. Its outside layer is made by plastic woven fabric. The inside one is made by aluminium foil, which shall be tightly sealed after full loading.
One 20' container could load 10 pallets. One pallet could load 2 jumbo bags with one overlaid on another. One jumbo bag could pack 900kg of PBT compound. The 20' container could load 2 jumbo bag x 10 pallet = 20 jumbo bags. So the container could load 900kg x 20 jumbo bag = 18,000kg of PBT compound.
The overall dimentions of the pallet with two jumbo bags are L 1.15m * W 1.15m * H 2.2m.
2. Small Bag:
The small bag is combined with two layers. Its outside layer is made by kraft with plastic liner. The inside layer is made by aluminium foil, which shall be tightly sealed after full loading.
One 20' container could load 20 pallets with one pallet overlaid on another.A total of two small package of pallet packaging.One pallet could be laid by 25kg x 32 small bag = 800kg of PBT compound.One pallet could be laid by 25kg x 40 small bag = 1000kg of PBT compound.Therefore the container could load 800kg x 10 pallet+1000kg×10 pallet = 18,000kg of PBT compound.
The overall dimensions of the pallet with 36 small bags are L 1.2m * W 1.1m * H 1m.
The overall dimensions of the pallet with 40 small bags are L 1.2m * W 1.1m * H 1.2m.
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