Friday, April 27, 2007

How Many Calories Ina Brownie

Role (Part I)





People often ask me what kind of paper I prefer to fold one or the other model, if I have a favorite type, or if there is a role "traditional" or "classic" Japanese origami which is the "grace" that makes it so special. Then give answers like "to complex shapes and with many details it is best to use tissue paper "or" I do maintain that the figures can be used as foil "or" kraft paper is good if you want to fold or brush wet. "And everybody is excited thinking about what much I know about this profession, all but myself that I actually realized that I have no idea what the role or how it works, or why has this or that property.

How does a origamist about of paper used, as it was made, what is the secret that keeps it taut and how to select the best for what purposes? "And what about papermaking and paper environmental problems that lead to society?

So no choice but to be investigated.

Maybe a good way to start is to say that is not paper. The word comes from Latin papyrus plant and noted that the Egyptians made their famous rolls of writing. However, although the principle is the same, the role we know and use today has its origin in that tradition. The papyrus is a plant with long leaves, stems soft and rather wide triangular base and the rolls were made from their bone marrow, a paste that is stretched and placed in molds where it is steeped in water, pressed and then allowed to dry finally rubbed with ivory or shell to soften the surface. Its origin dates back to 3000 BC and its use spread to Greece and Rome and was popular until the fifth century After that, the script was developed on scrolls, which were made of thin layers of leather cow, sheep or goat (1).






The true origin of modern role in China. Around 105 AD, Emperor Ho Ti ordered his chief eunuch, named Tsai Lun, the study of new materials for writing, because the wooden slats or pieces of silk were impractical for the increasingly massive use of writing. Their work resulted in the production of a vegetable-based pasta of bamboo fiber, mulberry and other plants as well as the development of a manufacturing method for the role, which remained secret for more than 500 years.

Only after 500 AD the art of making paper and went to Korea in 610, the Koryo Ramjing priest went to Japan to provide advice on the production of paper, both countries have perfected the method based on their own resources sciences and technology (in the 700 was introduced rice flour to the creation of the pulp). In 750 came to Central Asia, Tibet and India, to finally reach the Arab world and its vast empire, which stretched across North Africa to Europe itself.

Here there is a significant change in the nature of the role. The Arabs, by not having too many green resources, began using recycled textile fiber materials such as carpeting or items of old or damaged cane. The paste thus obtained generated a thinner paper but less permanent in time, also incorporated a finish with starch, which improved its resistance to the stroke of writing. The first paper mill in Europe was established in Spain in Arabic in 1036, in the city of Cordoba.

Maybe it's a good time to explain what is the role and how it works. The paper is an irregular structure formed by vegetable fibers that intersect in a paste which is hydrated and then decanted into a relatively homogeneous film. The size of the fibers plays a fundamental role to give their properties to the paper, long fibers give the paper a lot of strength and stiffness, but finished with coarse and rough, and small fibers generate a paper thin, shaped, flexible but not very resistant, textured and opacity, suitable for writing. In the mixtures of both fibers is the secret to achieve specific results.

a) white paper waste (1000x), b) secondary cellulose fiber (400x)

secondary cellulose substrate (200x)

With cross the paper manufacturing process came to Italy, where it is joined with a satin animal gelatin, which awarded him a large surface resistance and had scribes of the time they could use their sharp quills without tearing the material, so that the parchment began to fade quickly in Europe. The technique of writing with a pen, predominant in Europe at that time, in contrast with the calligraphic brush that was used in the East, was what defined the different characteristics of the European role, compared with that of China and Japan (2).

With the invention of printing in the fifteenth century the need for paper rose explosively and resources became scarce textiles and the handmade paper was not sufficient to satisfy it. In 1798, Frenchman Nicholas Louis Robert created the first machine for manufacture of paper, which was improved later by the English brothers Henry and Sealy Fourdrinier in 1803. They, in 1840, joined the crushing of wood to create the pulp. Finally in 1850 he created the chemical process that lowers the manufacturing costs thereof. In 1852 Meillier Tilghman found the pulp and patented the method for pulp wood. Only in 1853, the papermaking came to China and Japan, which currently produces 15% of the global role.





Bibliography:
(1) http://www.papelnet.cl/papel/papel.htm
(2) http://www.papelerapalermo.com/oficios/ art-on-and-get-the-papel.asp

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