From the Garland site It behaves much like regular HDPE. What temperatures and pressures are required? Minimum pressure of psi recommended. What percentage of parent strength can be attained? Again the process is much like regular HDPE. If plastic is softer, like UHMW, more attenuation of the ultrasonic energy occurs. Reason: When it is made it is cooled non-uniformly - the outside cools faster than the core.
Typical question: Can I buy annealed stock? Yes, but it costs more. Thread Tools. All times are GMT The time now is PM. User Name. Remember Me? Mark Forums Read. SFT Search:. We have done this succesfully for many customers in the past, and would be happy to advise you. I only offered to advise you. Like any process the materials define what can and cannot be impulse welded. Impulse welding can be very efficient in thin.
So my first question would be how thick are the 1cm X 1cm parts your looking to seal? There is also a bit of "black magic" in welding, since there are hundreds of formulations of UHMWPE, due to additives, such as colorants and processing agents, etc. So here's the answer to your question as to how "impulse welding" works.
Impulse Welding uses a thin resistant wire or band, usually called a heating element, that heats up in a few hundreds of a a second to operating temperature. Once it reaches the desired temperature it holds it for , once again a desired time, then the energy is removed from the element to allow the sealed components to cool to a state that give you your weld.
This is different that a heated die type tool, since the advantage is very quick seal times, and the ability to cool the process down before taking the pressure away.
This ability to hold pressure is very important when sealing hard to seal materials, since you need to insure the two parts are properly knitted together before removing the pressure. Constant heat dies tend to pull the seal apart prior to the knitting of the 2 parts. Pressure is important, but too much can cause "extrusion" of the material, therebye reducing the strenght cross section of the seal.
So the "black magic" part is balancing the amount of pressure with the correct profile of temperature. Something in the 40um thickness could be sealed in about 1 to 2 seconds and if all goes well can end up to be stronger than the material around it. Now the next question is shape. Straight seals are the easiest but many shapes are also very doable. We've made sealing elements as small as a 12mm dia. Hope that helps. Bob RE: Using localized heat to fuse UHMWPE and others Your question "I am trying to get fully cured or even B-stage ultra high molecular weight polyethylene to fuse to itself with the use of localized heat" confuses me.
As curing refers to thermoset materials like epoxies that harden on hearting. PE is a thermoplastic where adding some heat and maybe pressure will allow parts to fuse actually due to interdiffusion and then entanglement of the long polymer chains.
Polyolefin glues exist I believe, for example from Loctite. Maybe there is a terminology problem here. X linkable is a thermoset and will be very difficult to cure. I am a bit perplexed about the changing dimensions of the part. The temperatures required will depend partly on molecular weight and thickness, but more on degree of crystallinity. Even higher temperatures will be required for HDPE.
Molecular weight has nothing to do with density. If it is X linked, if you can weld it together then cure you should get an excellent bond. They cross-link themselves when exposed to moisture. That's the only curing type I know about. RE: Using localized heat to fuse UHMWPE and others so just to confirm, we are talking the ballpark of hundreds of psi to apply sufficient pressure assuming I can control heat delivery.
I determined the pressure by building a small prototype and testing before I built the full sized machine. When working with polypropylene or polyethylene, it is possible to regain their glossy surface by lightly heating the surface with a yellow open flame propane torch.
Keeping the above tips in mind, welding thermoplastics can be a fairly easy process to learn. For other procedures and standards, contact your local plastics distributor. Get more tips on plastic welding. Attention Applicants: You must be at least 18 years of age. The information supplied on this application is subject to verification. Employment with King Plastic Corporation is subject to satisfactory work history, personal reference reports and background checks from outside agencies. Qualified applicants receive equal consideration.
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Welding Polypropylene Polypropylene PP is one of the easiest thermoplastics to weld and is used for many different applications. Welding Polyethylene Another fairly easy thermoplastic to weld is polyethylene PE. Tips for Proper Welds Prior to welding thermoplastics, there are a few simple steps that need to be taken to ensure a proper weld.
Conclusion Keeping the above tips in mind, welding thermoplastics can be a fairly easy process to learn. This is a widget ready area. Add some and they will appear here. Please enable JavaScript in your browser to complete this form.
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