Metal detectors in the food industry

Metal detectors in the food industry

In order to obtain the good detection effect of the metal detector, it is just as important to choose the position for it as much as possible. Although metal detection systems are often considered when planning to install new production lines, metal detectors are also required to be easily installed in existing production lines. Most food and drug manufacturers install metal detectors at the end of the production line to test the goods before they are shipped to retailers and customers. However, from a cost perspective, an earlier detection of contaminants is more valuable because only the low-priced ingredients are wasted, rather than the packaged finished product.

The ideal installation location for metal detection systems varies from product to industry and from plant to plant. For most manufacturers, if metal detectors are installed in a relatively forward process within the production line, limited space is often a problem. But some major manufacturers have noticed this problem, such as Locke LOCK, which has developed a metal detector called `Waferthin`, which is compact enough to fit in a limited space, for example, in a bag making machine/packaging. Above the machine. Most manufacturers can configure the system according to the customer's requirements for space.

Fluid products, such as soups or cakes, can be inspected online by a pipe detector, where the pipe connected to the processing equipment carries the product through the detector. Metal detector manufacturers should be able to provide accessories that connect the equipment to any processing equipment. The type of pipe required depends on temperature, flow rate and product viscosity, but must be made of non-metallic materials.

Many food manufacturers install metal detectors before heavy and fragile equipment, as this protects downstream machinery from damage and avoids production disruptions, which directly benefits the economy. The detector can then act as a defensive pump, pressure roller and valve guard to prevent them from being damaged by metal contaminants. For example, in the production of biscuits, the detector is usually placed before the dough is formed into the forming drum. The patterned brass roller and the forming roller are very expensive and easy to scratch, and more serious damage will occur if metal impurities are encountered. Metal detectors are placed in front of the forming rolls to protect them from hard metal in the biscuits. This also ensures that the contaminants are not further crushed.
Make detection more difficult.

The strict hygiene regulations of the cleansing food industry have always been the primary consideration for metal detector manufacturers. Equipment must be easily and quickly disassembled for cleaning to avoid interruptions in production. The high-quality metal detectors are made of stainless steel and are IP56/66 rated for easy thorough rinsing at the end of each shift. If there is a higher demand for cleaning conditions, corrosive substances or high temperature products in the food industry, then it is more necessary to have such characteristics.

The important role of detecting and rejecting metal detectors is to provide reliable protection against sensitive and reliable detection of harmful metal fine debris. However, this protection can only be achieved when the contaminated product is reliably removed from the production process and the safe product is delivered to the customer. Therefore, the automatic rejection system is as important as the performance of the detector itself.

When a contaminant is found, the detector will generate a reject signal to drive the reject device after an adjustable time delay. It ensures that contaminated products are removed into the reject box. Most of the reject devices are pneumatic devices.
In conveyor systems, they can be push plates, flap doors or simple air blown rejects. Some products may require some parts of the conveyor belt to sag or tilt to separate contaminated products from good products. For example, in the production of biscuits,
The product passes through a return belt with a recycling bin underneath. If a metal object is found, a whole row of biscuits is removed.
To ensure complete product protection. On the other hand, for soups, a diverter valve is used to introduce contaminants into the second conduit, thereby eliminating contaminated products without interrupting production.

Since the reject device adopts the fail-safe mode, the electronic sensor can be used to check that the contaminated product is indeed removed into the reject box and does not enter the production line. Therefore, the safety of the product is greatly guaranteed.

Conclusion Today's generation of metal detectors proves that innovation in the metal detection industry provides a guarantee for the protection of the company's products from pollution. At the same time, there is still a gap between physics and process requirements, even if the zui sensitive metal detector does not guarantee the detection of every metal particle passing through it. However, the desire of manufacturers of production testing equipment for the challenge indicates that there will be some remarkable developments in the next few years.

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