packaging 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:What‘s the highest temperature aluminum foil can withstand?
Aluminum foil is flexible metal film, not only with moisture, air tightness, shading, abrasion resistance, Paul fragrance, non-toxic and tasteless, and other advantages, but also because of its elegant silver-white luster, ease of processing a variety of colors and beautiful patterns patterns, and thus more vulnerable to people of all ages.
Q:What's the maximum temperature that high temperature resistant aluminum tape resists?
Aluminum tape is made by calendering aluminum and thus an oxide of aluminum. The melting point of aluminum is 660.4℃ and its boiling point 2467℃. Aluminum foil can resist high temperature, but it can be oxidated. Aluminum oxide is an white power and belongs to covalent compound with the melting point of 2050℃ and boiling point of 3000℃.
Q:The difference between pure aluminum foil bag and aluminized foil bag
if the two materials are shined under the light, the pure aluminum bag is transparent while the aluminized bag is silver white and the brightness of aluminum foil is weaker than the aluminized bag.when touching the two types of bag, the aluminum foil bag is a little hardness while the aluminized foil bag is soft and has the ductility.
Q:Why continuous annealing aluminum foil production process?
Aluminum is generally required aging, this process is just the opposite with annealing refers to aluminum produced insufficient hardness, increase the hardness after aging treatment, making it difficult to deformation, anti-stress increase.
Q:How to use the bright surface and non-bright surface when having a barbeque.
The non-bright surface is heat-resistant and the bright surface may release metal toxins yc1962……
Q:What specification does air hose of aluminum foil have?
The installation methods and standards of air hose of aluminum foil composite sandwich board. 1.construction preparation 1.1 The construction supervisor must be familiar with air hose, air inlet arrangement plan, design requirements and related specification and rules. He or she should also know air hose, air inlet making and installation technology and confide a technological secret to group leader. 1.2 According to construction progress, the supervisor should make a demand planning of board and other auxiliary materials and exam the implementing. 1.3 Before the construction, the quality inspetor should take a complete inspection to construction equipment and maerial. Only when everything is qualified, can workers start. What's more, the corresponding record should also be made. 2. Construction process.
Q:What causes the velocity effect of the aluminum foil?
During the aluminum foil rolling process, with the rise of the thickness of the foil rolling system and thinning phenomenon is known as speed effect. For speed effect mechanism has yet to be explained in-depth research, the cause is generally believed that the speed of effect the following three aspects:
Q:How to prevent oxidation of aluminum coil?
2. The aluminum coils should try to avoid leaks, snow place. 3. Strengthen the management of rolling oil, its water content control in 0.04% or less. 4. aluminum coil packaging should be sealed packaging, and each volume should be placed in an appropriate amount of desiccant.
Q:How does the fireproof performance of alunimun foil?
The fireproof performance of alunimun foil is very bad, because the aluminum foil isn't pure aluminum.
Q:Waterproof aluminum foil and PVC for cupboard, which is better?
Waterproof aluminum foil is usually used in cupboard while PVC is rarely used. PVC is usually used in commode. But it's better to use PVC for cupboard. Aluminum foil paper may easily soak and damage the cupboard due to its good waterproofness if water seeps into it, so it is better to paste a whole piece of waterproof aluminum foil paper without interface through which water may seep into the cupboard. Since aluminum foil paper is an additional layer on the moisture proof particle board, it is not moisture proof and waterproof enough and thus outdated. Whether PVC board can be used for cupboard depends on manufactures. Some just use it as an advertising gimmick while some use it for cupboard bottom. Surely the latter one is more durable. Cupboard is the place that contains most water and connects with sewer.

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