Spare Composites No 6 Zhongke Road,Yinxiang,Jiangning,Nanjing,China. PC:211102 TEL:0086 25 52102314     Fax: 0086 25 52101573

 

Pultrusion involves pulling a collection of fibers in the form of roving, tow , mat or fabric through a resin bath and then through a heated die to cure the resin. This produces a continuous prismatic section which is similar to the pultrusion die. The process is used with a variety of resin and fiber types to produce products ranging from simple round bar to complex architectural mouldings. A flying cut-off saw is programmed to cut the product to the desired length. Since the predominant fiber direction is usually longitudinal this is reflected in the properties of the products which are usually strong and stiff in tension and bending with poor transverse properties. This limitation can be overcome by incorporating mats and fabrics with transverse reinforcement to provide a balance of properties.

The key elements of the manufacturing process are: Reinforcement Handling This consists of roving creels, mat and veil dispensers, and winders or braiders where other than axial reinforcement is required. Resin Impregnation This can consist of a simple resin bath or pressure/vacuum impregnation device Preforming Dies These serve to guide the impregnated reinforcement into the correct position, remove excess resin, provide pre-compaction to the approximate profile in order to assist air removal, wetting and to reduce the pressure in the main die. Pultrusion Dies This is a machined steel or ceramic die which is heated and produced the final profile. Dies can be more than 1m in length. As the material passes though the die, heat transfer initiates the cure reaction and the pulling speed is such that the resin has fully cured by the time it leaves the die. Pulling Device By allowing a suitable gap between the die exit and the pulling device, the product cools to a stage where the resin is sufficiently hard to be gripped by the pulling device. This can be a pinch roller or a caterpillar type haul off mechanism. Pulling speeds depend upon the resin system and the size and shape of the product. Typical values from industry are in the range 0.5m/min - 1.5m/min. Cut-off Device This is a flying cut-off saw which is programmed to cut the product to the desired length

SPARE COMPOSITES pultrusions are processed on advanced pultrusion equipment both imported and designed and manufactured by ourself. The specifications of the resins, reinforcements and other materials used can be varied to suit specific requirements, to manufacture products which will out-perform many conventional structural materials.

Pultrusion is the most cost-effective method for the production of fiber reinforced composite structural profiles. SPARE COMPOSITES pultrusion profiles are: STRONG - Having a high tensile and flexural strength, with a specific strength exceeding that of steel LIGHTWEIGHT - With a specific gravity of approximately 1.8, a density ?that of steel and 2/3 that of aluminium. DIMENSIONALLY ACCURATE - Manufactured to fine tolerances. COLOURFUL - Blended in colours which permeate each section, eliminating the need for painting. However, painting is also an option. NON-CONDUCTIVE - Providing excellent electrical and thermal insulation. NON-MAGNETIC - Providing excellent electromagnetic transparency. CHEMICALLY RESISTANT - Offering resistance to corrosive media such as salts, acids and alkalis over a wide temperature and concentration range.

Pultruded profiles have unique properties to overcome problems which conventional materials often can not fulfil and offering the   architect ,engineer ,fabricator ,athlete , and maintenance person a structural material for solving many design and engineering problems.