Skin-foaming-skin Extrusion Tandem Line

Application of Skin-foaming-skin Extrusion Tandem Line

It is suitable for extrusion cat6,cat7,cat8 etc core wire.

Main Technology Parameter of Skin-foaming-skin Extrusion Tandem Line

1. Copper Conductor inlet dia: Max.2.6 mm or 3.0 mm. 
2. Copper Conductor outlet dia: 0.4-0.9 mm (single-core cable drawing) 
3. Diameter Deviation of Copper Conductor (Online Laser Measurement): ±0.001 mm deviation from the mean value).
4. Ovality of Copper Conductor (Online Laser Measurement): ±0.001 mm deviation from the mean value.
5. Elongation ratio of Copper Conductor: 18-28%. 
6. Insulation dia.: Max.3.0 mm.
7. Insulation Type: 35-70% foamability for foaming  LDPE/MDPE/HDPE.  
8. Insulation Material:
8-1. Solid PE/PP. 
8-2. PE foaming agent (premixed). 
The designated PE foaming brands include Dow & Union Carbide (Model: DGDK6923NT), Borealis (Model: HE4873),  Tianshui Wanwei (PE inner insulation), Dow & Union Carbide (Model: DFDA7540NT),  Ube Industries 180 (PE outer insulation), Dow & Union Carbide (Model: DGDK3364NT), and Wilson (Concentration of Color Masterbatch: 1:100; Maximum Foamability: 70% (at most 50% for PE data cable)  or 60% (at most 60% for PE miniature coaxial cable)). 
9．Line speed 
9-1. 800 –1000 m/min for foaming core
9-2.1000 –1200 m/min for solid core PE
10. Control Parameters of Insulation Diameter
10-1. When the insulation outside diameter of the solid dielectic cable is less than 0.3 mm (based n online laser measurement), the deviation is controlled within ±0.006 mm from the mean value; when the insulation outside diameter is more than 0.3 mm, the deviation is controlled within 1% from the mean value. 
10-2. When the foaming insulation thickness is less than 0.3 mm (based on online laser measurement), the deviation is controlled within ±0.02 from the mean value. 
10-3. When the foaming insulation thickness is more than 0.3 mm (based on online laser measurement), the deviation is controlled within ±1% from the mean value.
11. For the solid core process, the mean capacitance deviation of the insulated core is controlled within ±1%. 
11-1.As for the capacitance stability of the insulated core in the foaming process:
（PF/m）>200 PF/ m    ±1%
11-2.When the nominal capacitance is  more than 200 pF/M, the deviation is controlled within ±1%.  
（PF/m）<200 PF/m    <±2 PF/m
11-3.When the nominal capacitance is less than 200 pF/m, the deviation is controlled within <±2 PF/m.
11. Concentricity (Measurements Are Much Preciser than Calculations)
The concentricity is 95% or more for an insulation outside diameter of 1.5 mm.  
The concentricity computational formula (f) is 1-(e1-e2)/(e1+e2),
Wherein e1 means the maximum thickness and e2 means the minimum thickness.
When the nominal thickness (e) is 0.15, f is 0.9;
When the nominal thickness (e) is 0.25, f is 0.92;
When the nominal thickness (e) is 0.3 mm, f is 0.94; and
When the nominal thickness (e) is 0.5 mm, f is 0.95.