Why does high frequency have penetrating power, and the scope of application of high frequency moist

Generally, the frequency of commercial power supply is 50Hz (60Hz), that is, the alternating current is continuously transformed 50 times (60 times) per second in the form of a sine wave, and the high-frequency alternating current is converted back and forth millions of times per second, and this high-frequency alternating current is called high-frequency.

The frequency of 100kHz and 300MHz can be dried, melted, heated, sterilized, and thawed. Most electrically insulating objects, such as wood, paper, fibers, plastics, etc., will cause electrical losses when placed in a high-frequency high-voltage electric field, and these electrical losses will obviously generate heat on the material (which is a high-loss material).

Because the heat is directly generated by the substance, it has the characteristics of rapid and uniform heating, and the absorption of radio frequency energy in the application of drying is proportional to the moisture content of the substance, and the higher the moisture content, the greater the absorption power, so it has the characteristics of self-regulating power.

The basic principle of high-frequency heating is the same as that of microwave heating, but the heating method is different, generally speaking, high-frequency heating needs to be achieved by using electrodes, while microwave heating only needs a closed metal cavity and then the microwave energy can be introduced by the waveguide, or directly use the waveguide to slot, and the heated object is directly heated by the groove in the middle of the waveguide.

In addition, the frequency of high-frequency waves is lower than that of microwaves, so it has a longer wavelength and a deeper penetration of substances, which is suitable for heating larger objects.

There is no harm, but it has some effect on pregnant women.

The range of fit is limited and the accuracy is not high.

SFY-6 halogen moisture rapid tester, widely used, used in multiple industries for sample moisture determination, 3 5 minutes rapid determination,

Hello, the rectifier circuit of the high-frequency machine is often broken down, which may be caused by the output voltage of the transformer being too high. --Junjingsai (Chongqing) specializes in blister machines, high-frequency, air compressors, cutting machines, we are happy to answer for you, thank you!

The machine must be fitted with a good ground terminal (with the correct ground wire).

The machine is extremely sensitive to moisture and dust, so it needs to be placed in a suitable working space.

The vacuum tube of the machine will generate high heat, so it should not be placed next to the machine that generates high heat, nor should it be installed in a place where the solar energy is directly irradiated, because the heat dissipation function of the vacuum tube will be affected by the above reasons.

If the machine is stopped for more than one hour, when the machine is turned on again, it is necessary to wait for 10 to 15 minutes so that the vacuum tube can be preheated and the service life of the vacuum tube can be protectedThe upper and lower extremes of the machine (upper and lower die) should not be directly touched together, and there must be insulation and working pieces between them.

During operation, when the high-frequency output is high, remember not to touch the upper output (i.e., the upper mold), nor to use the universal meter, test meter or other low-frequency, low-voltage instruments to try to directly measure the output of the upper pole, which will lead to accidents.

Regularly inspect the insulation at the lower end (lower die), if there is damage, burning, or breakdown, the insulation needs to be replaced immediately, otherwise if you continue to work, sparks will be generated and the process cannot be completed.

If sparks often occur (when the upper and lower dies touch together, when the high cycle output) does not go to check and repair, it will lead to damage to the machine parts and affect the work.

The working objects used to make finished products should not have moisture and dust as much as possible, because the above-mentioned objects are easy to cause sparks.

After the machine turns on the power, you will hear the sound of the fan turning (4kw, 5kw sound is smaller), this is for the vacuum tube heat dissipation, if the fan fails, it must be repaired immediately, otherwise it will cause damage to the vacuum tube.

1: First determine whether the material is suitable for high-frequency welding (must contain more than 10% PVC) 2: Whether the high-frequency connection is correct (make sure that the high-frequency output is normal) 3:

Whether the welding time and pressure setting are reasonable (according to the type of material and thickness setting) 4: Whether the mold design is reasonable (to ensure that the pressure can be well transmitted to the welding surface) 5: Whether the temperature setting is reasonable.

High-circumference ultrasound equipment****.

Principal Engineer.

Jushanyuan.

First of all, you have to make sure what material your material is, the heat sealing effect of high frequency is better for things containing 30% PVC material, like some materials can not be heat-sealed, such as PE, aluminum foil, etc., these should be done with a heat press, if you don't understand, you can refer to:

There is a detailed introduction to the high-frequency heat sealing machine above.

PVC: Adjust the temperature to 100 10, current; PET: Temperature adjusted to 80 10, current; The welding time depends on the depth of the molded tooth marks and adjusts by itself.

Without further ado, I have 15 years of experience in high-frequency operations, and I don't believe it will be helpful to try it first.

Hello, according to your problem, make a description as followsThe high-frequency machine is suitable for heat sealing and welding of plastic materials of any shape containing more than 30% PVC, and can also be used for welding heat sealing of PET PETG, TPU, PU, PP, PE and other materials.

As long as your products are these materials and need to be welded, you can use high-frequency machine production, if your product is more special and you don't know whether you can achieve welding production, you can bring the materials to Ningbo Aiwo Dongxiong to try it, they can provide samples for free, and you can customize a variety of high-frequency machine special equipment, it is a good business.

High-frequency automatic puller.

It is mainly used for pressing PVC, PET, PETG, EVA, AGA, APET, PU, TPU or any soft and hard plastic materials with PVC content of more than 30%, as well as leather, leather, composite fabrics for heat sealing, welding, surface embossing and indentation. Such as the wallet logo, leather embossed; blister packaging of toys, daily necessities, daily necessities, etc.; PVC inflatable products such as swimming rings, life jackets, bobo balls and other heat-sealed welding crimping; EVA shoe materials, high-frequency hemming of shoe uppers, TPU composite sports protectors, such as helmet lining, etc.; PVC composite fabrics such as waterproof bags, buoyancy vests, gel ice pads, etc.

Among them, the high-frequency fusion splicer can only weld and cut the blister sheet containing 20% or more of PVC, while the environmental protection sheet (APET, PET, PETG, GAG) can only be welded and not cut; The high-frequency fuse machine can weld and cut both PVC sheets and environmental protection sheets. The application range of high frequency is very wide, I want to know if I can press it, try it with a high frequency machine, and if you don't have a machine, the material will be given to the manufacturer to help you try it.

High-frequency plastic welding machine use.

Pure PVC or any soft and hard rubber containing more than 30% PVC, as well as genuine leather or cloth for special purposes, can be processed.

For example: footwear, logos, photo albums, business card books, book covers, document bags.

Raincoats, umbrellas, sails, tote bags, wardrobes.

Hard-shell packaging or blister packaging such as backrests, seat cushions, headrests, bags, carpet embossing, blowing toys, electronics, clocks, hardware tools, sun visors, door panels, car seat cushions, etc.

In general, the processing depth is that the higher the frequency, the higher the temperature, but the smaller the sensing depth, according to the skin effect of the high frequency. The hardness depends on the material of your workpiece, 45 steel can generally reach about 50, but it is easy to crack if it exceeds 50.

Do not try to adjust the thermostat knob in the work of the high-frequency machine, if you must adjust it in the working state of the equipment, please take insulation protection measures to prevent burns.