Acrylic Display, Acrylic Sheet

Acrylic Sheets

2008-12-01 – 11:30 上午

Cast acrylic sheet is a material with unique physical properties and performance characteristics. It weighs half as much as the finest optical glass, yet is equal to it in clarity and is up to 17 times more impact resistant. Cast acrylic sheet is made in over 250 colors, in thicknesses from .030″ to 4.25′ and can transmit ultraviolet light or filter it out, as required.

Aircraft manufacturers use Cast Acrylic sheet in jets and helicopters. Because of its light and energy transmission properties architects find Cast acrylic sheet ideal for skylights, sun screens, fascia panels and dome structures.

Expansion and Contraction:
Cast acrylic sheet responds to temperature changes by expanding or contracting at a far greater rate than glass

Flexibility:
Cast acrylic sheet is much more flexible than glass or many other building materials. When using large sheets for windows, it is important that rabbets or channels be deep enough to provide support against high winds.

Chemical Resistance:
Cast acrylic sheet has excellent resistance to attack by many chemicals. It is affected, in varying degrees, by benzene, toluene, carbon tetrachloride, ethyl and methyl alcohol, lacquer thinners, ethers, ketones and esters.

Electrical Properties:
Cast acrylic sheet is an excellent insulator. Its surface resistivity is higher than that of most plastics.

Light Transmission:
Colorless Cast acrylic sheet has a light transmittance of 92%. It is clearer than window glass and will not turn yellow. Cast acrylic sheet is also available in a large variety of transparent and translucent colors.

UV Light Resistance:
Clear acrylic sheet resists ultraviolet light degradation. Each acrylic sheet has a ten-year-limited warranty against yellowing and loss of light transmission.

Optical Clarity:
Acrylic sheets have excellent light transmission. Clearer than glass! Will not yellow after prolonged sun exposure.

Weather Resistance:
Despite heat, cold, sunlight, and humidity acrylic sheet maintains its original appearance and color.

Safety:
Shatter-resistant, earthquake safe, and burglar-resistant. Increase safety with windows glazed of acrylic.

Light Weight:
Even with its strength and durability, acrylic sheet is only half the weight of glass.

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Headband Practical uses

2008-11-21 – 11:10 上午

Sweat absorption

“Sweatband” redirects here. For the Bootsy Collins album, see Sweat Band. For the component of a hat, see Sweatband (hat).
Headbands, or sweatbands, are worn around the forehead during physical activity to absorb sweat and keep it from reaching the eyes. Sweatbands are often made of a continuous loop of terrycloth, as it is a particularly absorbent fabric. Folded bandanas, usually knotted behind the head, also serve this purpose. Tino headbands are usually used for sports.

The sweatband was invented by Carl M. Tipograph. He holds the patent for the sweatband in both Canada and the United States. He realized the importance of providing an effective way to remove sweat from the head.

The sweatband gained a large part of its popularity during the 70’s and 80’s, when aerobics classes gained popularity. They, in large part, fell out of the “fashionable” catergory when the grunge era rose. However in the mid to late 2000s some aspects of the post hardcore subculture began to wear these again.

Cold protection
Some specialized headbands are designed to be worn covering the ears, in order to protect them from cold temperatures and snow. These tend to be broader and of heavier fabric.

Head protection
The car headband is a conceptual protective headband for car occupants being investigated by the Centre for Automotive Safety Research (CASR), University of Adelaide, Australia.

Managing hair
Headbands are regularly worn by sportsmen and women to keep hair out of their eyes, but there are also musicians who are known to wear it. In sports, famous users include David Beckham, Ronnie O’Sullivan; in music, Little Steven and Guns N’ Roses lead singer Axl Rose have made headbands their personal trademark. Ireland’s most famous hair/head band wearer is Andrew Hussey.

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Fashion Headband

2008-11-21 – 11:05 上午

Headbands were once almost universally an item of female clothing, but have recently become popular for men in some countries, due to a fashion for long hair. Alice bands for men have been worn by David Beckham and Ronnie O’Sullivan.

During the 1980s, headbands were associated with rock and roll music, particularly with Bruce Springsteen, Olivia Newton-John, and Mark Knopfler.

In the late 2000s, pop singer Lights wears a headband as part of her outfit.

In Japanese culture, hachimaki headbands may symbolise determination or devotion.

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Headband

2008-11-21 – 11:04 上午

A headband is a clothing accessory worn in the hair or around the forehead, usually to hold hair away from the face or eyes. Headbands generally consist of a loop of elastic material or a horseshoe-shaped piece of flexible plastic or metal. They come in assorted shapes and sizes and are used for both practical and fashion purposes.

Horseshoe-shaped headbands are sometimes called Alice bands after the headbands that Alice is often depicted wearing in Through the Looking Glass.

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Sky Lantern Usage in festivals

2008-11-13 – 3:59 下午

Later non-military applications were employed as they became popular with children at carnivals. These lanterns were subsequently incorporated into festivals like the Chinese Mid-Autumn and Lantern Festivals. Pingsi in the Taipei County of Taiwan holds an annual Lantern Festival in which sky lanterns are released.

The people of Northern Thailand also have a variation on sky lanterns. These are known as Khoom Loy. Northern Thai people use sky lanterns all year round, for celebrations and other special occasions. One festival in particular is the Loy Kratong festival in which lovers and partners gather on the riverbanks to float flowers and candles, launch fireworks and release sky lanterns together. It is considered good luck to release a sky lantern, and many Thais believe they are symbolic of problems and worries floating away.

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Sky lantern History

2008-11-13 – 3:54 下午

According to popular lore, the Kongming Lantern (Chinese: 孔明灯) was the first hot air balloon, said to be invented by the sage and military strategist Zhuge Liang,whose reverent term of address (i.e. Chinese style name) was Kongming. They were first deployed at the turn of the 3rd century as a type of signalling balloon or, it is claimed, as a type of spy blimp in warfare. Alternately the name may come from the lantern’s resemblance to the hat Kongming is traditionally shown to be wearing.

It is likely that this technological discovery is misattributed because of the Chinese historical practice of attributing great discoveries to significant historical figures rather than to the actual inventors. According to the sinologist and historian of science Joseph Needham, the Chinese experimented with mini-hot air balloons from as early as the 3rd century BC - which suggests that the attribution of its invention to Kongming is indeed apocryphal.

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Sky Lantern

2008-11-13 – 3:51 下午

Sky lanterns (simplified Chinese: 天灯; traditional Chinese: 天燈; pinyin: tiān dēng) are airborne paper lanterns traditionally found in East Asian cultures. They are constructed from oiled rice paper on a bamboo frame, and contain a small candle or fuel cell composed of a waxy flammable material. When lit, the flame heats the air inside the lantern, thus lowering its density causing the lantern to rise into the air. The Sky Lantern is only airborne for as long as the flame stays alight, after which the lantern floats back to the ground. They can achieve quite a height and launching them in strong winds is not recommended.