Setron

Prior to the development of Pfleiderer centrifugal process three production methods were used to produce fiberglass poles; filament winding, matched metal die molding and pultrusion. The centrifugal process (patent applied for) yields optimum results with regard to shape, reinforcement and smoothness of the outer surface. SETRON reinforced polyester poles are produced in specially design centrifugal machines which are fitted with chromium plated steel moulds.

Textile E-glassfiber fabrics are used as reinforcement (tensile strength = 2000N/mm2) with the majority of the fibers in the warp. The weft fibers simply stabilize the fabric. Such a fabric results in an excellent material to take the main axial loads of a pole. The fabric is covered on one side with a chopped
strand mat to provide the shear strength required in case of impact, compression or torque. Depending on the required pole wall thickness (function of draft and length of pole) 4 to 8 layers of the above material are used. For protection purposes a chemical resistant covering is used for the external layer of the pole.
This covering guarantees that a uniform resin-rich layer of a thickness approximately 1mm is achieved.
The centrifugal produced pole is manufactured and cured in one operation. The glass to resin ratio is 40 to 60. The upper end of the pole is reinforced with a stainless steel grid in areas of high stress caused by the nuts and bolts used for lamp assembly.

Over 30 years' experience in the manufacture of flagpoles, lighting poles and glide-slope antenna towers made of fiberglass reinforced plastic and the many advantages of GRP as a material apply equally when it comes to mobile telephone infrastructures.