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Whether you are recycling plastic goods or handling virgin materials, creating a product free from metal contaminants is a lot more important today than ever. Trends to thinner walls, tinier hot-runner nozzles, and more costly and sophisticated machinery and tooling suggest that even the smallest part of tramp metal can cause expensive problems.

Processors often usually do not recognize the significance of Liquid Explosives Detector. Even virgin material can acquire metal contaminants at various stages of manufacturing and transportation, right up until the moment it enters the throat of your molding or extrusion machine. Contamination can vary from tiny particles worn off by equipment abrasion to entire nuts or bolts loosened by vibrations in processing machines. There's also the human factor: Inevitably, items including coins, pens, and paper will occasionally fall under the item stream.

For that reason, metal-detection technology is utilized throughout the plastics industry to safeguard processing equipment and also to ensure product purity. Metal detectors keep your product under strict surveillance at all times and stop unnecessary machine downtime and costly maintenance.

Whenever we speak of "metal detectors," some processors may believe first of magnets. These are used effectively ahead of the metal detector for capturing ferrous metals. Less familiar to a lot of processors are electronic detectors for all types of metals. These are active devices that actuate a valve or some other device to reject the contaminated material.

What's more, electronic metal detectors can be monitored remotely coming from a personal computer. This capability offers a record of where and how frequently contamination takes place in your plant. Such valuable data may help you compare the purity of various vendors' resins or diagnose excessive machine wear.

How metal detection works - There are two basic types of metal detectors:

Single-coil systems - Each time a metallic particle falls from the high-frequency electromagnetic field, an eddy current is induced within the particle, thereby removing energy from the coil system. Because of this the maximum amplitude of the coil's vibration decreases. More energy is then supplied to improve the amplitude back to maximum level. This disturbance of the coil's vibration is detected through the electronic circuit as signaling the actual existence of a metallic particle.

Balanced-coil system - Single-coil systems provide inexpensive solutions for easy, "down-and-dirty" applications. These systems are easier to setup, but they cannot make up for products that could be slightly conductive, owing to the actual existence of moisture, acidity, or additives like carbon black.

Balanced-coil systems offer product-effect compensation that suppresses false signals brought on by the item. The benefit is always to prevent rejecting perfectly good material. Analog versions need the operator to manually reset the compensation as material moisture content or other variable changes. Newer digital versions can be preset to self-adjust for various products or a range of moisture content or some other variables inside a product.

Making feeling of sensitivity - Electronic metal detectors are high-tech, sensitive devices that must be handled with a certain amount of care. Excessive vibration from motors, chains, along with other nearby equipment may cause a detector to emit a false signal and reject good material.

You shouldn't have to sacrifice good material for accurate detection and rejection. In addition to product-effect compensation, state-of-the-art Underground Searching Gold Metal Detector offer adjustable sensitivity and positive speed control to lower the amount of material lost.

Maximum sensitivity of a detector determines the minimum scale of metal particle that it may sense. Smaller particles can slip through, and this factor is essential to choosing the proper detector for an application. Maximum sensitivity is measured by loading a sample of resin with steel spheres and using the measurement in the middle of the coil, in which the sensitivity is lowest. Steel spheres are used because there is a uniform, defined size, meaning that the measurements are repeatable. Also spherical particles would be the most difficult to detect due to their relatively low area.

All metal separators usually are not equally sensitive. True sensitivity depends on the scale of the search coil. The lesser the search coil, smaller the metallic particle that can be detected with maximum sensitivity. A good principle to bear in mind is the fact normal sensitivity is all about 1% from the diameter of the coil. Based upon the sensing aperture, innovative pbgavn are designed for detecting contaminants as small as .4 mm.

Sensitivity is also associated with the composition and shape of the material. Although electronic all-metal separators will detect ferrous particles, stainless-steel, lead, aluminum, bronze, tin, and a lot more, they may be most understanding of ferrous particles. This is because metallic particles are detected through eddy currents, and the larger the eddy current the greater the sensitivity. Eddy currents on the surface of ferrous particles are more than those generated on the surfaces of aluminum, bronze, or copper particles, meaning the sensitivity of ferrous particles is more than the latter. What's more, eddy currents from metallic particles are only effective on the surface, so the larger the surface, the larger the sensitivity. Because of this flat metallic particles, or particles with irregular shapes, are much better to detect than spheres.

Another feature offered by Held Dangerous Liquid Detector is called positive speed control. Due to variations in bulk density, metal particles may not travel via a pneumatic conveying line at the same speed as the resin itself. Positive speed control senses the actual conveying speed in the metal contaminants and automatically adjusts the open period of the rejection valve in order to get rid of the metal having a minimum of resin loss.

Junhong Electronic&Technology (Dongguan) Co., Ltd is a professional manufacturer since 2005, specialized in R&D of security detection technology. We have various of products range: Walk through metal detectors, hand held metal detectors, X-ray luggage scanners, X-Ray Body Scanner, Underground Metal Detector, Industrial Metal Detector, Checkweigher, Infrared Body Temperature Detection System; Explosives Detector, Under Vehicle Surveillance Systems; etc.

Contact Us:
Office: +86-769-22688609, 22688610, 22688612
Fax: +86-769-22687886
MOB/WhatsApp:+86 189 3826 7258
Email: [email protected]
Address: No.23, Xintian street, Baizhoubian, Dongcheng district, Dongguan city, China
Zip: 523110

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