Filament winding is a technique for manufacturing reinforced plastic parts of high strength and low weight in which continuous fibers or filaments encased in a matrix of resinous material are wound into a definite pattern. Glass reinforcements usually used by "Eurokompozit" are: roving, yarns or unidirectional woven tape and epoxy resins. These systems have wide field of applications where advantage can be taken of their properties such as low weight, high strength, excellent electrical properties and their good corrosion and chemical resistance. Methods of winding: hoop, helical or longitudinal give wide spectrum of different mechanical properties and possibilities of meeting the required properties. Filament wound tubes and cylinders are custom-made, with dimensions from Ø8 to Ø1100 mm, and length for customer requirements.

Maximum weight for winding (tools + tubes) is 1000 kg.

The above FW tubes are used as electro insulation material in high voltage transformers (as shown below).

 

Production of tubes and cylinders made of glass fabric is done in a way that glass fabric tapes are going throught-heating system stretched with given strength.

With this technology we produce tubes and cylinders with max. diameter and length of Ø220 x 2500 mm, and pressure of 170 bars.

 

Characteristics	Test methods	Units	Tubes with roving (FW)	Tubes with glass fabric
ELECTRICAL Characteristics
Axial electric strength in oil at 90 oC	DIN 53481	KV	50	50
Electric strength normal to axis in oil at 90 oC (for d=3 mm)	DIN 53481	MV/m	40	40
Insulating resistance after immersion in water	DIN 53482	Ohm	1-E10	1-E9
MECHANICAL Characteristics
Axial compressive strength	BS 6128/1-15	MPa	180	280
Flexural strength	DIN 53452	MPa	200	320
Cohesion between layers	BS 6128/1-11	MPa	315	280
Flexural modulus	DIN 53457	GPa	13	15
OTHER Characteristics
Water apsorption	DIN 53495	mg/cm3	1.5	1.5
Density (nominal)	DIN 53479	g/cm3	1.8 - 2.0	1.8 - 1.9
Thermal classification	BS 1757	class	B	B
Hydraulic pressure		bar	≥ 200	≥ 180