Pengyuan

Vacuum insulated panels, or VIPs, are a relatively new product making their way into buildings in the United States.

They can be used as stud cavity insulation or as continuous exterior insulation on structures, just like other types of insulation.

As the name describes, VIPs consist of a panel with the air inside of it removed to form a vacuum. It isn’t a perfect vacuum, but the air pressure inside the VIP is considerably less than ambient pressure. The panels are airtight and resistant to water vapor absorption. They make good insulators because the lack of air almost completely eliminates conductive and convective heat transfer through the center of the panels. Typical panels are fairly small, 1 x 2 feet or 2 x 4 feet, and about 1 inch thick.

VIPs have an R-value of approximately R-25 per inch at the center of the panel and about R-20 for the whole panel (exact R-value depends on the manufacturing process and materials). The center of the panel will have a higher R-value than the edges, much like a window, as edges provide a thermal bridge for conductive heat transfer and lower the R-value of the entire panel. Even the whole-panel R-value is considerably higher than other insulations: fiberglass batts are around R-3.8 per inch, EPS is around R-4 per inch, and XPS is around R-5 per inch.

VIPs are installed on the sheathing plane of a building using adhesive. The material surrounding the VIPs in a wall is very important, because it helps protect the VIP from damage during installation. However, because the VIP is not continuous, the lower R-value surrounding insulation will bring the total wall R-value down. This is similar to what happens in a traditional stud-framed wall with fiberglass batts in the cavities — the wooden studs provide a thermal bridge for heat to escape and reduce the total wall R-value. With VIPs, even if the “studs” were made of EPS insulation, the whole wall R-value will still drop more than the fiberglass wall drops with the addition of wooden studs. It is important to consider how to provide structure for VIPs without providing too much thermal bridging.

As with any new building product, there are potential disadvantages of using VIPs that must be considered. First, VIPs must be manufactured in a factory and then shipped to the building site.

They can’t be cut or modified in the field. This means that detailed plans must be completed prior to construction and there is no flexibility in modifying them, unlike a traditional stick-framed wall.

VIPs also cost quite a bit more than other types of insulation. In addition to the more intensive manufacturing process, the panels have to be shipped to the building location.

There are currently only a few manufacturers in the United States, so this could be quite a long distance.

Finally, panels will naturally lose some vacuum over time. When they do, the R-value drops substantially. Manufacturers currently estimate the lifespan of the vacuum at 25 to 50 years. The seals must be treated carefully during the shipping and installation process to protect the vacuum. And putting a nail through a VIP damages the R-value of the panel much more than with other types of insulation. Losing the panel vacuum due to a hole in the panel reduces the panel’s R-value by more than half, often bringing it down to around R-6 per inch.
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Feature:
Non-Woven foil is light in weight, excellent tear-resistance & good puncture resistance & excellent water vapour resistance and higher tensile strength. It is easy to handle during construction. anti-aging, peel strength, and printable
Insulation Usage:
Non-Woven foil is used widely to make car cap to Reflective Sunshine & in Roof, floor, wall, pack food for heat retaining, medical & sanitary, industry & agriculture, construction & daily-used products such as the agricultural plant covers, roof waterproof material, disposable items for medical and industrial applications, liners for furniture, packing material, shopping bags, suit and garment cover, industrial protective coveralls, garment accessory materials, bed articles, medical and sanitary articles as well as family and hotel consume articles, especially for heat insulation, thermal insulation and construction and other fields.

Aluminum foil composite film is the most commonly used composite film,it’s usually contain pure aluminum and aluminum.

1.The characteristics of aluminum foil

It has the good mechanical strength,light weight,no thermal bonding,with a metallic luster,good shading,it also has a strong ability to light reflection,not easy to be corroded,waterproof,strong air tightness,and retention of aroma.

2.What is the aluminum foil used for

It’s used for pharmaceutical packaging,food packaging,barrier packaging,electromagnetic shielding packaging,etc.Do you like eat seaweed?Do you know what is the seaweed packaging material?That’s right,It’s made of aluminum foil composite film,besides,all the light, non barrier packaging cooking is composed of aluminum foil composite film.

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Paste paper is one of the oldest decorated papers used by bookbinders, and can be found in books that are centuries old. Going back hundreds of years (and continuing today), sometimes bookbinders would use up their leftover bookbinding paste by throwing some pigment into the paste and brushing it out on some paper to make decorative papers to then use in bookbinding. They would then make strokes or stipple patterns with a brush in the paste, or use a tools to draw or comb designs in the paper and let it dry. One of the distinctive qualities of paste paper is the rich 3-dimensional patterns and designs. This is achieved because when the paste is first applied to the paper and a pattern made in the paste, it is thick, with peaks and valleys. As the paper dries, the paste is sucked flat into the paper, leaving a 3-dimensional pattern on a 2-dimensional surface.

TYPICAL APPLICATIONS:

• Used as the export equipment packing materials for moisture barrier, water-proof, fire-retarding and anti-corrosion.
• Processed to all kinds of fire-retarding products such as fire-proof packet, fire-proof suit, fire-proof bag, and fire-proof gloves etc.
• Used as the thermal insulation material on Roof,wall,floor,tank,vessel,air conditioner,tank,heat supply pipes or construction materials for the purpose of fire-retarding, anti-corrosion, heat protection and sound aborption.
• Packing chemical equipments such as oil and steam transportation pipeline.
• pipe insulation,roof heat insulation,waterproofing membrane
• travel mats,beach mats,camping moisture-proof pad

Vacuum packing is a method of packaging that removes air from the package prior to sealing. This method involves (manually or automatically) placing items in a plastic film package, removing air from inside, and sealing the package.[1] Shrink film is sometimes used to have a tight fit to the contents. The intent of vacuum packing is usually to remove oxygen from the container to extend the shelf life of foods and, with flexible package forms, to reduce the volume of the contents and package.

Vacuum packing reduces atmospheric oxygen, limiting the growth of aerobic bacteria or fungi, and preventing the evaporation of volatile components. It is also commonly used to store dry foods over a long period of time, such as cereals, nuts, cured meats, cheese, smoked fish, coffee, and potato chips (crisps). On a more short term basis, vacuum packing can also be used to store fresh foods, such as vegetables, meats, and liquids, because it inhibits bacterial growth.

Vacuum packing greatly reduces the bulk of non-food items. For example, clothing and bedding can be stored in bags evacuated with a domestic vacuum cleaner or a dedicated vacuum sealer. This technique is sometimes used to compact household waste, for example where a charge is made for each full bag collected.

Vacuum packaging products, using plastic bags, canisters, bottles, or mason jars, are available for home use.

For delicate food items which might be crushed by the vacuum packing process (such as potato chips), an alternative is to replace the interior gas with nitrogen. This has the same effect of inhibiting deterioration due to the removal of oxygen.

With the social development, people are attaching more and more importance to health. Food safety is a main element influencing the people’s health which has always been taken as a big thing by foreign food manufacturers and supervision dept. Food packaging ,particularly, the packing material directly contacting the food, is directly related to the food health , futher to the physical health of human. hence there’s very strict requirement in food packing material in foreign countries in terms of the technical properties and health safety .in recent years, China have also reinforced the health safety requirment on process of food production . against this background, it’s so important to use the food packaging material with food health safety. as the main packing material , BOPET film has the following merits:

• Good mechanical properties, 3-5 tims impact strength other films, endurable in folding .
• Good endurance with oil,fat,olefine acid and most of the solvents.
• Good endurance with extreme temperature. usable in long term in 120℃,in short terms, workable in 150℃ ,down to -70℃,very little effect on the mechanical properties.
• Low gas and vapor permeability, good barrier properties on water,oil and smell improving the shelf life .
• High clear film, UV absorption ,high glossy film.
• no poison , no smell ,good heath safety property, used in food packaging directly.

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PET film or PolyEthylene Terephthalate film is a thermoplastic polymer commonly referred to as polyester film. Like most thermoplastics, PET films can be biaxially oriented or bubble extruded. Polyester film is one of the most common substrates used in the converting industry because of its balance of properties in relation to other thermoplastic polymers. Also, the processing tolerances of PET film makes it the ideal choice for vacuum metalizing, coating and laminating. PET Film is comparable or better than other thermoplastics in the following categories:

• Specific gravity
• Elongation
• Melting point
• Tensile strength
• Tear strength
• Oxygen permeability
• Water vapor transmission rate
• Insulation breakdown
• Dielectric constant
• Service temperature range
• Dimensional stability