Food packaging bags are in direct contact with food, and the materials used must meet food-grade standards to ensure food safety and no pollution while extending the shelf life of food.packaging manufacturers    ,At present, the materials commonly used in food packaging bags are divided into the following categories:

PE (polyethylene): It has excellent gas barrier, oil barrier and aroma retention, which is beneficial to the moisturizing of food. Moreover, PE has good plasticity and is not easily deformed and damaged as a packaging material.

PP (polypropylene): transparent material, good gloss, easy to process, high tear resistance, high impact strength, water resistance, moisture resistance, high temperature resistance, can be used normally at 100 ℃ ~ 200 ℃.

Aluminized film (aluminum + PE): The main component of the composite packaging bag is aluminum foil, which is silver-white, non-toxic and tasteless, oil-resistant and temperature-resistant, soft and plastic, and has good barrier properties and heat-sealing properties.

Different materials have different properties and uses. In our practical application, we mainly use different production processes and materials to make food packaging bags with different requirements such as moisture-proof, oil-proof, oxygen-proof, shading, and fragrance preservation.

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1. Laser cleaning is non-contact, which can be transmitted through optical fiber, and can easily realize long-distance operation in combination with robots or manipulators, and can clean the parts that are difficult to reach by traditional methods;

2. The laser cleaning equipment can be used stably for a long time,industrial laser cleaning machine ,  without consumables and materials, only a small amount of electricity is required, maintenance and operation costs are low, automatic operation can be easily realized, and it can be used indefinitely;

3. Laser cleaning can clean different types of pollutants on the surface of various materials to achieve high cleanliness. It is a new application of surface engineering treatment.

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1; Before changing, look at the internal structure of the door lock. There are usually two types of multi-function and single-function, mainly referring to the difference between plugs.door lock hardware ,The so-called multi-function means that the handle can be toggled up and down. If used in conjunction with the multi-function lock body, it can have the function of lifting and locking the door.

2; first look at the stand-alone function, first remove the screws of the baffle, rotate the handle 180 degrees, then put the screws back, then use a screwdriver to insert the handle connector, remove the screws used to connect the handle, and then take the handle down.

3. For multi-function locks, it is easier to replace the handle. Just use a screwdriver to insert the handle connector and remove the handle.

4; Whether it is single-function or multi-function, it is the same, just move the removed handle up and down and install it on the panel on the other side. This completes the handle changing direction.

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Before studying the UAV formation flight algorithm, it is necessary to understand the communication method between UAVs.light up drone ， Communication methods The control methods of the fleet can be divided into the following types:

Centralized control mode: The individuals in the formation system communicate with each other, and transmit information such as speed, coordinate position, and motion status. The system with this control method flies better because every UAV in the formation system knows all the information in the formation system and can make more scientific flight decisions and routes.

Distributed control method: The individuals in the UAV formation system only need to communicate with the UAVs on site, and there are few communication packets and communication links. Compared with the centralized control method, the flight effect of the formation system using this control method will be worse.

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Plastic-type is a great insulator, so plastic-type material piping are poorly conductive, a characteristic that may be often valuable but a disadvantage.anti static agent ,Due to higher work surface resistance, area or executed fees do not movement and collect, and there is a probability of spark explosion when discharging.

One strategy is always to include PVC pipe antistatic representative to the natural material, that is appropriate for the production method. The PVC pipe has antistatic properties right after use, and also the antistatic professional lasts for a long time.

Another technique is to coat the top of the tube with an antistatic agent, that is generally applied during use, so the pvc pipe has surface area resistance along with a quick antistatic time.

These two methods, whether it is inner covering or exterior layer, are typical obvious hues and may not affect the color of the PVC tube.

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