alu lidding foil

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Aluminium foil acts as a total barrier to light and oxygen (which cause fats to oxidise or become rancid), odours and flavours, moistness, and germs, it is used broadly in food and pharmaceutical packaging. The purpose of aluminium is to make long-life packs (aseptic processing|aseptic packaging) for drinks and dairy goods, which allows storing without refrigeration. Aluminium foil containers and trays are used to bake pies and to pack takeaway meals, ready snacks and long life pet foods.

Aluminium foil is widely sold into the consumer market, often in rolls of 500 mm (20 in) width and several metres in length.It is used for wrapping food in order to preserve it, for example, when storing leftover food in a refrigerator (where it serves the additional purpose of preventing odour exchange), when taking sandwiches on a journey, or when selling some kinds of take-away or fast food. Tex-Mex restaurants in the United States, for example, typically provide take-away burritos wrapped in aluminium foil.

Aluminium foils thicker than 25 µm (1 mil) are impermeable to oxygen and water. Foils thinner than this become slightly permeable due to minute pinholes caused by the production process.

Aluminium foil has a shiny side and a matte side. The shiny side is produced when the aluminium is rolled during the final pass. It is difficult to produce rollers with a gap fine enough to cope with the foil gauge, therefore, for the final pass, two sheets are rolled at the same time, doubling the thickness of the gauge at entry to the rollers. When the sheets are later separated, the inside surface is dull, and the outside surface is shiny. This difference in the finish has led to the perception that favouring a side has an effect when cooking. While many believe that the different properties keep heat out when wrapped with the shiny finish facing out, and keep heat in with the shiny finish facing inwards, the actual difference is imperceptible without instrumentation.The reflectivity of bright aluminium foil is 88% while dull embossed foil is about 80%.



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Q:Can aluminum foil be used in the microwave?
Microwave oven microwave frequency radio waves generated belong, usually around 2500MHz. The microwave band has the following characteristics: 1) food and water can be absorbed, the molecule strenuous exercise, heat is generated. 2) can not be absorbed by plastics, ceramics and glass. 3) be under the influence of a conductive metal in a microwave field.
Q:What's the highest temperature resistance of the aluminum foil ?
Aluminum foil is directly pressed by aluminum. Melting point: 660.37, fire point: 550℃. I’m not sure whether it can be installed, but since it is exhaust duct, the temperature may not be too high. It will not be much higher than 100℃ anyway as the boiling point of water is just 100℃.
Q:Performance of aluminum foil and how does it insulate heat? Describe it precisely and in detail and better give the source
Aluminum foil can’t insulate heat by itself but it has strong conductivity for heat. Its function is to reflect heat source.
Q:Who knows how to choose aluminum foil coating?
1, first you must check whether harmful substances contained exceed the standard.2, Pay attention to the content of formaldehyde in the lacquer. It is possible that furniture in your house contain formaldehyde, so you need an air purifier.3, misuse of lacquer can also cause problems. Before painting, you should buff the wall and make sure the surface dry and clean, without dust and oil stain. The leakage part is properly sealed. Mix well with an appropriate amount of water to guarantee its luster, covering power, film formation and duration.
Q:Where to buy aluminum tape?
Aluminum tape is available in building materials market, packing material stores and advertising material stores. If not, kitchen ventilator store may be a choice.
Q:What's the application of double-sided conductive aluminum tape?
Aluminum foil tape with all the seams of the aluminum foil composite paste, the seal and insulation nails puncture wounds repair. Aluminum tape is widely used in refrigerator, air conditioning, automobile, petrochemical, bridge, hotels and so on. Application: Aluminum tape is suitable for all kinds of transformers, mobile phone, computer, PDA, PDP, LED displays, notebook computers, copiers and other electronic products in which electromagnetic shielding is required.
Q:How does aluminum foil bag should be heat-sealed?
If you don't vacuumize bags,heat-sealing machine is ok. Some heat-sealing machines have hand grips, some are pedaled or with belt wheels. Prices vary with different manufacturers. If you want to vacuumize bags, a vacuum machine is ok. After the vacuumizing process, the vacuum machine is directly sealed.
Q:What kind of aluminum tape is used for producing refrigerator?
Aluminum foil is the basic material, applied with glue and added with a layer of plastic for improving its tensile strength.
Q:The classification of aluminum foil
Q:How to prevent aluminum foil from wrinkling?
Due to the strip shape is serious bad, folding formed in the process of aluminum foil coiling or expanding. Its essence is that its tension is not enough to make the box surface flattening. For a device with the tension of 20 mpa, the box surface flatness shall not be greater than 301. When it is more than 301, it will wrinkle inevitably. Due to the rolling aluminum box often bear the bigger tension than follow-up processing, some aluminum foil that just show the bad strip shape when rolling turn to wrinkle when cutting or used after annealing. Main reasons of wrinkling are due to poor flatness controlling, including incorrect roll grinding ,unreasonable roll shape controlling, unreasonable parameter controlling of rolling and cutting process, bad incoming material strip shape and incorrect strip shape adjusting and imperfect precision of sleeve or tube core. Main reasons of wrinkles: The large amount of pressure make the rolling uneven or coiling lack tension. Improper controlling of roll shape or rolling pressure is too low; Uneven thickness of billet, bad flatness or shear wave. Winding shaft precision is not good and the sleeve is not round. Improper control of pressing roller pressure.

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