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

Sunday, April 1, 2007

What To Say When You Get An Award

Purranque My workshop: The Kawasaki Rose


A figure in classic origami rose is Toshikazu Kawasaki created from its fold spiral. Its delicate petals curved its amazing realistically have become one of the most popular models and disseminated within the origami (and beyond).






The history of this rose is easy to build the story of its author. There is very little information about this Japanese mathematician who taught NA Technical School of and Sasebo became the first "Origami Doctor" of history. also is recognized for his studies Theoretical about relationship between origami and Mathematics , developing, among others, the theory of iso - areas. some time ago (1998) published the book Roses, Origami & Math (which should come in on my way home now:)).

This book is an entire chapter dedicated to the rose and its variations, making it the first version "author" of the diagram of this figure. In 1994, during the Convention New York , Kawasaki teaching not the U.S. Joseph Wu to fold the rose, and this, in turn, turned and gave a copy to his friend Winson Chan who after a splitting process generated a bending sequence and a diagram, which was made public and spread around the world through network and was popularly known as the " New Rose" . Later Kunihiko Kasahara published in his book "Origami for the Connoisseur " a diagram, a little less elaborate than the model Chan, for what he called the" Rose Kawasaki Original ". Some other changes have been made on both diagrams, either to get a more petals or different endings, but the heart of this figure, the spiral fold, remains unchanged as shown in the genius of its author.

diagram Chan is still my favorite, but anything by the end result and I guess also for sentimental reasons (it was one of the first memorized and gave figures). However, I have to admit that its initial requirement pre-bend a squared grid inclined at 22.5 degrees (and the subsequent reference to it to get some kinks) they take the elegance. I here a video of how close the figure after having created the grid.





And it is precisely the study of New Rose which allows a origamist learn a lot about relationship between geometry and origami . Build this rose is like going creating, step step, the CP of the figure, to close after a couple of moves to master. The point I would like note is that anyone who folded a few times this figure may realize that there is no need to predefine the grid to get the major kinks of it (step 12 Chan diagram). The geometry perfect author provides numerous references to get each from two simple lines to 22.5 degrees. This is especially useful when using thick paper and textured to bend the rose, because of method for Chan generate the grid loses accuracy on the external lines.

With this in mind, and studying a bit I managed to develop a diagram to get the whole picture from a couple of lines of reference, including the staff side petals steps 9 to 11 Chan diagram.

For example, to create the folds of step 12 Chan , you need only line shaft and a point of reference, aligning the line on itself by doubling and scoring the fold over the reference point as I show the following:



and when I remember my old professor of mathematics in school reciting from memory: "There is one and only one line perpendicular to another and passing through a given point." That is, a theorem for origami : "To bend a line perpendicular to another only takes the same line and a point" .

Also there are other references to follow in the same fold, such as those in the same picture frame.

same happens with the other lines.





My hope was to get the rose with the fewest bends as possible, so that petals not stay with many lines that were marked and a little more "clean", but in the end only managed to avoid a few. also the method itself is as complicated as Chan (or perhaps more) , staying only satisfaction of having learned a lot and have grown in my relationship with paper, that final fully justify this exercise and so I share it with anyone to try it. This is the link to the page Google Base Document and this is the direct link to document (Is a pdf file compressed into a zip , weighs about 1 Mega):

newrose2.pdf.zip

many greetings and good luck to whoever tries.