high frequency weld machine
other plastic boxes machine
How to choose right plastic welding machine
Naturally, high-frequency welding (radio frequency) is not the only way to join together sheets of PVC and PU. So, why use HF rather than other techniques?Below we have provided some comparisons between HF welding and a few alternative joining techniques.
Hot Air Welding
Hot air welding uses hot air or a wedge to heat the coating on the fabric where it is to be bonded together. A Nozzle or heated wedge is positioned between two rollers that pull the material through the machine. As the material is pulled through the machine, hot air is applied to the surfaces to be fused together. Pressure from the rollers and heat form the hot air cause the plastic to fuse as the plastic cools.
Hot air welders join thermoplastic industrial fabrics and films using very precise heat, speed and pressure settings. The correct combination of these three parameters allows one to achieve a complete weld. In the case of hot air welding, heat is provided by compressed air blowing across electrical heat elements and is injected at the welding point.
High frequency welding
Radio Frequency Welding (RF) is a very mature technology that has been around since the 1940s. Two pieces of material are placed on a table press that applies pressure to both surface areas. Dies are used to direct the welding process. When the press comes together, high frequency waves (usually 27.12 MHz) are passed through the small area between the die and the table where the weld takes place. This high frequency (radio frequency) field causes the molecules in certain materials to move and get hot, and the combination of this heat under pressure causes the weld to take the shape of the die. RF welding is fast. This type of welding is used to connect polymer films used in a variety of industries where a strong consistent leak-proof seal is required. In the Industrial Fabrics Industry, RF is most often used to fuse/weld vinyl (PVC) and polyurethane(PU) coated fabrics. This is a very consistent method of welding.
Please note that Exposure conditions experienced by RF heater operators can cause elevated body temperature, eye irritation, RF burns, and some neurological problems. To reduce exposure conditions the use of Electromagnetic shielding should be used as much as possible without hindering the manufacturing process.
The most common materials used in Radio Frequency Welding are Thermoplastics such as PVC and Polyurethane. It is also possible to weld other polymers such as Nylon, PET, EVA and some ABS Resins
Gluing
Compared to gluing, HF welding (RF welding) saves a lot of time and produces a seam that is significantly stronger than a glued seam. Customers of ours in the advertising industry in the Middle East choose to our machines for this very reason – burst seams caused glued billboards to fall down in strong winds, resulting in personal injury. HF welding also eliminates the use of adhesive, which contains solvents that could be harmful to production personnel and is not good for the environment.
Sewing
Materials joined with a sewing machine are of course held together, but are neither air-tight nor waterproof, which are often mandatory requirements for products like tents or products that are designed to be filled with air or water. When a sewn joint is stressed, the load is put on the thread holding the joined material together. However, when an high frequency seam is stressed, the load is absorbed by the material surfaces, which of course means that the HF-welded seam is stronger. Furthermore, the seam created with HF can be welded in a manner that provides a uniform transition without splices between the joined materials. There is no space through which dirt, moisture or bacteria can penetrate and impair the product’s strength and durability.
other kinds of high frequency pvc welding machine produce
Rf pvc clear bag welding machine
high frequency pvc dry bag welding
hf inflatable product welding machine