Coating and shade of PTFE coated fabrics

PTFE is best known generally as a non-stick liner in cooking utensils and on cutting tools, and as a thread close up tape. There are a vast number of commercial uses for which is available as wedge, sheet, rod and conduit, most of which is often machined in similar fashion to steel. Film can be formed by casting, extrusion or skiving (veneering) procedures.

There are numerous of other fluorocarbons which may have some degree of similarity to PTFE belts. The closest in performance properties, are commonly used for processing and coating:

Fluorinated Ethylene Propylene (FEP). Functioning temperature is -260 Celsius to +205 Celsius. Since it forms a proper film surface it has lower permeability to most liquids and smells (and resists the fastening on of ice). Influence strength and wear amount of resistance are also higher.

Per fluorinated Alkoxy (PFA), a co-polymer of PTFE belts. Working heat is -260? C to +260? C. It has similar properties to FEP good results. the higher working temperature of belts.

Coating

Our suppliers have been using PTFE by means of water-based (aqueous) dispersion to coat flexible woven, and a few non-wovens, materials such as glass fiber cloth (usually referred to as cup cloth, or just "glass"), Nomex(R), Kevlar(R) and woven line. These high end substrates provide the polymer additional dimensional stability and mechanical power. Only materials which stand the very high refinement and application temperatures can be coated. A number of techniques can be used in processing to enhance the split strength and resistance to creasing of the completed fabric, provide conductivity (anti-static properties), or resistance to oil and fats.

Shade

The natural color of coated fabric is light to medium tan, sometimes darker. This can be normally not controllable, as the shade is produced by the caramel isation of the weaving cloth sizes and lubricants in the various cloths when heated during belt layer. Pigmentation is possible. PTFE Coated Glass Fabric in the almost all applications glass cloth offers the most cost effective base, and even more than matches the PTFE belt’s upper recommended functioning temperature of 260C and lower static functioning temperature of -190C. In dynamic conditions the coated fabric can be used down to -50C. The E-glass (electrical grade) glass used has a high strength-to-weight proportion and excellent electrical properties.

A variety of cloth types are coated, and a mixture of glass cloth and weight of coating is available to suit most applications. PTFE fiberglass belts coated glass textile is defined by: Basic glass cloth style (coaters worldwide use similar types) (the US style reference point as used in this paper is the most typical found); Weight of belt’s layer; Pre-treatments to base material or polymer; Whether much more two-side coated; If calendared (depending on control method).

Bombinobelts is a leading manufacturing unit for all types of belts, felts and filter bags.