PTFE fabric, also called Teflon fabric, PTFE glass fabric, PTFE coated fabric, is made of fiberglass fabric and PTFE disperison. We purchase the A grade fiberglass fabric from professional fiberglass yarn manufacture and then impregnate the fiberglass fabric rolls with PTFE dispersion, heating it under high temperature so as to make sure of the full absorption.
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Teflon is the material which was discovered by Dupont Company in the s, later more and more items or materials relevant to Teflon was invented. Teflon materials own the advantages of non-stick, high tempearture resistant, glossy surface, great tensile strength etc, one of which is the Teflon glass fabric.
Then how can Teflon fabric help the rubber extrustion indsutry? What is the key point? First let us know the difficulties in the rubber extrusion industry.
PTFE fabric
Extrusion is sorf of way of manufacturing the plastic products, usually seen in the production of Rubber products or plastic produts, such as rubber extrusion, Wood plastic composite decking extrusion. When it comes to the rubber extrusion, the conveyor belts on the machine have to bear the weight of rubber extruded, and convey the rubbers, cool down the rubbers.
In the real process of rubber extrusion, there are some common questions. E.g., 1. The rubber would stick to the conveyor belts, hard to remove. 2. The high temperature rubber parts would do damage to the belt surface. 3. The surface of belt is not gloosy, which would affect the shape of rubber. In this way, how can the PTFE fabric make contributions to better rubber extrusion?
Rubber-Extrusions
In the above section, I list some potential problems in the process of rubber extrusion, and in this part I would like to explain in details how the Teflon fabric could do good to the rubber extrusion, or how the Teflon fabric belts could work as a good material for curing belt.
Non-stick surface makes it easy for workers to remove the rubber parts from the curing belt(Teflon glass fabric belt), moreover, due to its non-stick feature, it would be easier to uninstall it and clean it compared with the stainless steel belt.
Teflon fiberglass fabric belt could resist to high temperature up to 260°C, in this respect, no matter how many rubber parts the Teflon fabric belts bear, it won’t be damaged by the high temperature. Teflon fabric could resist to 280°C or even 300°C at most for short time, usually less than 20 mins, but if it is kept under this temperature for too long, its physical performance would be also broken, users should also pay attention to this point for longer lifecycle.
Some people may claim that the rubber surface became unflat due to contacting the unflat curing surface before totally cooling down and shaping. The problem is just a pieces of cake in front of Teflon glass fabric curing belt, the PTFE fabric owns the totally glossy and flat surface, which won’t bring any negative effect to the rubber parts.
Silicone fabric is also another sort of alternatives for PTFE fabric curing belts, same as Teflon fabric in high temperature resistant, UV and chemical resistant. Moreover, in the silicone fabric curing belt, it is much easier to peel the rubber parts, but in terms of price, it is also expensive than the Teflon fabric, consumers who attatch great importance to the great performance would prefer it.
PTFE mesh fabric conveyor belt, also made of PTFE dispersion, and fibergalss fabric, but differs with PTFE fabric in the shape, with holes, some consumers would like the PTFE mesh conveyor belt as curing belts if they want more clear shape before the rubber parts totally cools down. Also the PTFE mesh fabric is also non-stick, which will do no harm to the normal production.
Silicone Coated Fabric
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Our company, Jiangsu Bocheng New Tech Materials Co., Ltd. speacializes in the R&D and manufacture of Teflon fabric, adheisve backed Teflon fabric/tapes, belts etc, with over 20 years experience in this field. Aimed to provide the consuemrs with best products at best price.
PTFE Coated Fiberglass, PTFE Coated S-2 glass, PTFE coated Quartz and other high temperature, composite sewing threads offer amazing operating characteristics. Unaffected by most chemicals, they will not burn, will not support flame, will not rot or support fungus. Our PTFE coated quartz thread operates to 2,000 deg. F. Amazing! However, you wouldn’t use these threads unless you have to, not necessarily because they’re overly expensive, but because they require a special skill set in order to make them work. If your application needs these properties, however, there are no alternatives. I like to say this is OK because it prevents everyone with a sewing machine in their garage from becoming your competitor! It’s not as easy as changing a bobbin and switching from polyester to S-2 fiberglass with Inconel wire twisted into the thread!
As mentioned, this is not a drop-in substitute for an aramid, polyester, or any other thread. There is a learning curve to go through if unfamiliar with this type of thread. The very unique and extreme operating properties of PTFE coated fiberglass (or S-2 glass, Quartz, wire inserted, etc.) threads require operator training and machine adjustments to make them work acceptably.
First of all, a factory lubricated thread is going to be much easier to use. This lubricant is applied after PTFE coating. We offer two high speed thread lubricants. X80 is a silicone/mineral oil based thread lubricant and is, by far, the most popular choice. This product is ideally suited for extreme needle heat environments when sewing through multiple layers of thermal insulation, like silica blankets, ceramic fiber mats, texturized glass, etc… We also offer a wax based thread lubricant (X50) that is used occasionally for lighter duty applications. In a few cases, customers will “post bake” the final product to remove any residual oils.
With or without the use of lubricants, the following suggestions help dramatically.
SLOW DOWN. Especially if un-lubricated thread is being used.
Change all hooks, needles, tension guides, etc. Anything that touches the thread must be free of burrs, gouges, etc. These items will need to be changed regularly.
Be sure the tension device where the thread comes out of the bobbin case is new and burr-free.
Use the correct needle size. We’re happy to help out with a suggestion.
Be sure there are no grooves where the thread passes through the hole in the walking foot. No rubbing or abrasion points.
If sewing with a wire inserted (Stainless steel, Inconel or other), try placing a nylon stocking over the thread spool and pass the thread through a hole in the top of the stocking. This helps prevent free-spooling of the thread and minimizes any “kinking” due to the steel or wire insert.
There will likely still be breaks occurring, but the properties of these threads are outstanding and we must sometimes put these difficulties in order to take advantage of these amazing products.
As always, let us know if you have any questions or comments.
Want more information on ptfe coated fiberglass fabric? Feel free to contact us.