Polybutylene terephthalate PBT

PBT for optical cable is mainly suitable for the production of all kinds of optical cable beam tube, with the characteristics of fast production, stable extrusion, good performance and so on. This PBT materials has good mechanical and electrical properties, stable residual length, shrinkage and other characteristics.

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Description

Description

PBT内同.jpg

Product Parameters

No.	Description	Unit	YT/T1118.1-2001	Our products value
1	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(250°C/2 16kg)	g/10min	7~15	7~15
5	Saturated ratio of moisture content	%	≤0.5	≤0.3
6	Tensie Yield strength	MPa	≥50	≥55
7	Yield elongation	%	5~10	5~10
8	Elongation at break	%	≥100	≥150
9	Tensile modules ofelasticity	MPa	≥22100	≥22400
10	Flexural modules of elasticity	MPa	≥2200	≥2500
11	Flexural strength at 3.5% of strain	MPa	≥60	≥70
12	Shore hardness HD		≥70	≥75
13	Melting point	℃	220-230	220-230
14	Coeficient of linear expansion(23-80)	10-4K-1	≤2.0	≤1.0
15	Compatibility with filling petroleum jellyTensile yield strength Yield Elongation at break	MPa %	≥50 ≥100	≥50 ≥100
16	Volume resistance	Ωcm	≥1x1015	≥2.0X10

Process Technical Parameters

Instructions:

1. The setting of processing technical parameters of Series DH 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.

Setting of Temperatures

1.Diagram of Extruder Screw:

PBT挤出螺杆.jpg

2.Structures of Extruder Screws: Ordinary extruder screw and BM

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.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

Packaging