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Natural fiber products - Swicofil's target products Synthetic fiber products - Swicofil's target products
Polyethylene
peshadenet.jpg (10243 Byte) flat
textured
monofilament
spun yarns
fibers
BCF

Introduction
Properties
Applications
Grades
Processability
Background info

Introduction

Polyethylene is the most popular plastic in the world. It has a very simple structure, the simplest of all commercial polymers. A molecule of polyethylene is a long chain of carbon atoms, with two hydrogen atoms attached to each carbon atom.

polyethylenemolecule.gif (3389 Byte)

Sometimes it is a little more complicated. Sometimes some of the carbons, instead of having hydrogen attached to them, will have long chains of polyethylene attached to them. This is called branched, or low-density polyethylene, or LDPE. When there is no branching, it is called linear polyethylene, or HDPE. linear polyethylene is much stringer than branched polyethylene, but branched polyethylene is cheaper and easier to make.

As a result of branching, side groups become attached to the main chain. Branching leads to a decrease in crystallinity, lowered density, and impaired stiffness. Branched, low-density polyethylene has good toughness and pliability. It has outstanding electrical properties, it is resistant to acids and bases, and has high tear strength. Branched polyethylene is used for films, drapes, table cloths, squeeze bottles, and coatings for foil.

Linear, high-density polyethylene has high crystallinity and high melting temperature. Linear polyethylene has a greater hardness and tensile strength than branched polyethylene. It is used in bottles, house wares, toys, pipes, and wire and cable insulation.

PE production scheme

 

Properties
 

HDPE

GRET

 
Specific gravity

0,960

0,930

g/cm2
Factor to calculate tex value

754 x d2

730 x d2

-
Range of temperatures

-30 to + 95

-30 to + 95

C
Melting point

130

130

C
Tensile strength
max.poss.: 0,16 – 0,25 mm
0,26 – 0,40 mm

50 or specified
60
55

65 or specified
75
70

cN/tex
Elongation at break
minimum possible
maximum possible

25 or specified
15
100

25 or specified
15
100

%
Shrinkage at 100 C
minimum possible
maximum possible

5 or specified
2
15

5 or specified
2
15

%
Selfextinguishing (SE)
according to UL 94-V2
Our monofilaments can be supplied as selfextinguishing monofilaments. However, this effects the standard colour and excludes the possibility of UV-resistance

 

Physical Properties of Polypropylene
Moisture regain  
Refractive indexNnD23  
Thermal conductivity  
Coefficient of linear thermal expansion  
Heat of fusion  
Specific heat  
Density of melt at 180oC  
Heat of combustion  
Oxygen index  
Decomposition temperature range  
Dielectric constant (0.1 M Hz)  
Dissipation factor (0.1 M Hz)  
Specific volume resistivity  

 

Applications
  • Nets and fabrics for agricultural end uses, for geotextiles
  • Any kind of sun breakers, sun blinds, shade nets, wind walls,
  • open packaging, safety nets
  • Swimming pool covers
  • Ropes, strings
  • fishing net
  • reinforcements in various coated products such as plastic, paper etc

 

  • Weaving into fabrics for agro- and geotextiles, filters, shade nets, industrial textiles, swimming pool covers  and furnishing fabrics

  • Rachel knitting into protection nets, windwalls, open packaging, safety nets, marking materials etc.

  • Reinforcements of various coated products such as plastic, paper etc.

  • Braiding into ropes, fishing net strings, electric fences, rubber band covering etc

 

Grades
  • flat yarn
  • textured yarn
  • high tenacity
  • monofilament
  • fibers
  • tow
  • spun yarns

 

polyethylenechain.gif (41587 Byte)

Processability

 

Background information

 

 

Our supplier partners

Esbjerg Thermoplast - a division of VitaEsbjerg Thermoplast
Div of Vita Polymers Denmark A/S

 

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