[China Packaging Bags Trading Network] The longest food preservation package should be vacuum packaging. Vacuum packaging can isolate the contact between food and external air to the greatest extent, so that the food can be kept in the freshest state under vacuum. Then vacuum What material is the packaging bag made of?
Vacuum plastic packaging bags are made of polyethylene and polypropylene.
Polyethylene is also commonly used to make vacuum plastic packaging materials. It is flexible and waterproof, but has low transparency, stable chemical properties, and non-toxicity. It is commonly used to make heat seal layers and moisture-proof layers of composite plastic packages. Has good gas barrier, oil barrier and fragrance retention properties.
Vacuum packaging is a general term for flexible packaging composite film products. Depending on the temperature used, there will be many divisions: some need to be sterilized below 100, some need to be sterilized at 100 degrees, and 121 degrees and 135 degrees. Of course, there is also room temperature, and the sterilization method that may be selected under such normal temperature conditions is irradiation sterilization. And the characteristics and weight of the contents to be packaged must also be considered to determine the reasonable use of the packaging materials. There is nothing fixed, and the best is the best.
Vacuum packaging materials have two-layer composites and three-layer composites. There are many common two-layer composites, depending on the product to be installed. Vacuum packaging materials are divided into PET / PE PA / PE PA / CPP, PET composite can also be evacuated, but it is easier to leak air, PET is relatively brittle, PA / PE vacuum performance is good, can withstand boiling within 100 degrees Celsius Bacteria, frozen at low temperature around minus 30 degrees Celsius. PA / CPP is a vacuum cooking bag that can withstand high temperature cooking within 120 degrees Celsius and low temperature freezing at minus 30 degrees Celsius.
Different requirements have different requirements for the material of the vacuum packaging bag, and the product is different. The process and material of the vacuum packaging will also change. , High-quality products for everyone to choose.
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General sewing machines are composed of four parts: head, base, transmission and accessories.
The machine head is the main part of the sewing machine. It is composed of four mechanisms: barbed material, hook thread, thread take-up and feeding mechanism, and auxiliary mechanisms such as thread winding, material pressing, and tooth-dropping.
The base is divided into two forms: platen and chassis. The platen of the table-type machine base plays the role of supporting the machine head and is used as a workbench during sewing operations. There are many styles of tabletops, such as one-bucket or multi-bucket folding Tibetan type, cabinet type, writing table and so on. The chassis of the chassis-type machine base plays the role of supporting and storing the machine head, making the sewing machine easy to carry and store.
The transmission part of the sewing machine is composed of parts such as a frame, a hand crank or a motor. The frame is the backbone of the machine, supporting the deck and footrests. When in use, the operator steps on the pedal, drives the rotation of the pulley through the crank, and drives the head to rotate through the belt. Most hand cranks or motors are directly mounted on the nose.
Accessories for sewing machines include needles, bobbins, screwdrivers, oilers, etc.
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