Dynamic viscosity

>> Saturday, 24 January 2009

Material                     Dynamic viscosity, Pa·s
Air (temp. 200C) 10-5
Water (temp. 200C) 10-3
Mercury (temp. 200C) 1,5·10-3
Aluminum (temp. 7000C) 1,1·10-3
Zinc (temp. 7000C) 1,7·10-3
Iron (temp. 14000C) 6·10-3
Blood (temp. 370C) 10-2
Oil 10-2-100
Honey 101
Melted polymers 102-104
Cake 103-105
Cheese 107-108
asphalt 108
Melted glass (temp. 5000C) 1012
Glass 1040


Biggest-ever agricultural film production line

>> Sunday, 18 January 2009

Reifenhäuser supplied in 2005 a 35 m high 3-layer blown film line. Essential components of the new wide film extrusion line are:

- gravimetric dosing system for each extruder,
- 2 extruders, 150 mm screw diameter,
- 1 extruder, 200 mm screw diameter,
- 3-layer blown film die with internal bubble cooling and 2200 mm die diameter ensuring a high production capacity,
- high-performance air ring KRF 2200,
- film guiding system with 4 ultrasonic sensing arms, collapsing assembly and side gusseting unit,
- 8-ply folding station for C-type folding enabling simple handling of the oversized film widths in greenhouse construction,
- fully automatic short-length winder FAC 4200 with bobbin magazine, adjustable for winding different film lengths and to cope with extremely short reel changing cycles,
- REIcofol automation system for process control, including film measuring station and indication of side gusseting depth.

The new 3-layer blown film line is designed for an extremely high production capacity of 2200 kg/h. Films of a circumference of up to 18,5 metres and thicknesses from 0,080 to 0,200 mm can be produced on this line. The immense total construction height reaches 35 metres. Coextruded 3-layer films are distinguished by specific properties, e.g. weather resistance, permeability to light, air-conditioning effects and high tear resistance. In addition, the consumption of raw materials processed on coextrusion lines is considerably reduced. A great advantage of a coextrusion line over a mono-layer line is that expensive additives can be used in the thin outer layers only. Also, exact matching of materials to requirements is much simpler. Multi-layer films with a durability of up to four years can be very economically produced as a result.


3D polymer's structure model

All you have to do is one click on the picture and then experiment with available options

Polyethylene, PE
Polyethylene, PE

Polypropylene, PP
Polypropylene, PP

 Polyvinyl chloride, PVC
Polyvinyl chloride, PVC


Random polypropylene copolymer

>> Sunday, 11 January 2009

Polypropylene is thermoplastic polymer consisting mainly of propylene come from a low pressure process based on catalysts and have generally linear polymer chain. There are three general types of polypropylene: homopolymer, random copolymer and impact or block copolymer.
Random copolymer is produced by statistical insertion of units mainly ethylene. Through this, the glass transition temperature and melting point are lower than in homopolymer.
Additionally we receive better mechanical properties in the temperature below zero (e.g. impact) and optical (transparency). Processing of random copolymer by injection molding considering properties mentioned above characterizes lower temperature (lower cycle time) and pressure. Application, e.g. thin wall and transparent products on the other hang thick wall, because of lower crystallization ratio (amorphous structure).


Polish polymer processing companies

>> Tuesday, 6 January 2009

The story of Ponar Zywiec

The successor of the machine factory with more than 100 years of traditions in construction of different kinds of machines, among them also machines with hydraulic drive, has specialized in construction of injection moulding machines and hydraulic presses for plastics and rubbers for above 30 years.





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