Zisha needle process, in the end how important
Zisha needle process, in the end how important
Bright needle, one of the indispensable tools for manual molding, purple clay pot can produce a smooth jade effect, because of its existence, then bright needle process, how important is it?
What is the bright needle process?
Refers to the process of scraping and pressing the surface of the forming green body with a smooth instrument (mainly plastic sheet and horn sheet).
The role of the needle not only affects the workmanship of the pot is good, but also has a significant impact on the firing effect and bubble effect of the pot (whether from the artistic point of view or the practical point of view, the role of the needle is obvious).
The history of the needle
It is said that during the Qianlong period of the Qing Dynasty, there was a pot maker who was rushing to make several tea POTS. He spent a lot of time on the blank, and was always dissatisfied with the light and light. That day, he sat by the mud bench to pick up a pot blank to get naked, his wife happened to be brushing her hair next to him, a hair in the hair comb on the table, he thought it was a bright needle picked up to use. Because this hair comb is made of horns, long-term comb hair has been very smooth, coupled with soft and high elasticity, making the pot body is very smooth. From then on, all the people who make purple clay POTS know that the various bright needles made of horns are the best things for light billets.
The material of the needle
Zizhaming needle is commonly known as the horn piece, and the horn maker is the best and most common. The head of the needle should be smoothed, thinned down slowly from top to bottom, dipped in water when in use, dried when not in use, scraped into different shapes and thicknesses, used for processing smooth and delicate surfaces such as the body, spout, handle, lid and rib.
In order to match the different shapes of the teapot, the needle style is also very wide, common are: body cylinder needle, mouth needle, square head, cover head, oblique needle (for example, when making rib grain, there is also a special rib needle).
The function of the needle
As a necessary tool for finishing, the needle can combine the mud, molding and firing, so that the surface of the pot body, unlike the glaze applied on porcelain, can be glossy, although there is a certain porosity, without leakage. The quality of needle kung fu directly affects the formation of the "coating" film of the pot body.
First, the coarse mud particles on the surface of the body are squeezed into the body to make the mud emerge, so as to form a fine surface layer, so that the surface of the body is illuminated.
While the inside of the body is kept under the clay layer on the surface of the purple sand body, because of the unprocessed, the mineral composition of the mud and the accumulation of particles, the body of the body keeps the loose gap unique to the purple sand. After firing, the pot body produces certain pores.
A simple word is that the needle can make the surface of the pot smooth, the structure of the pot porosity increase, the surface smooth.
In the process of the needle, some fine particles will float on the surface of the pot body commonly known as "overflow", the more the needle work is in place, the higher the sintering degree of the purple sand pot, the higher the sintering degree of the purple sand pot, the strength of the body is also high, not easy to break, in addition, the permeability and impermeable performance of the purple sand pot has been fully demonstrated.
The benefits of a needle
A bright needle kung fu good pot, will have such characteristics:
Good look and feel - the pot with good needle kung fu, out of the kiln will have a sense of moistening, the pot table is smooth and bright, the color is correct, delicate, and the gloss is good, looks more harmonious and beautiful, and has a simple atmosphere, so that the original rough products are more fine and durable.
High precision - makes the chic and changeable object shape structure appear more rigorous, the contour lines are clear and decent, the texture of the tendens is particularly clear, greatly improving the accuracy of the body, making the mouth cover of various purple clay POTS tight, and the gap between the two is generally less than 0.5 mm.
High strength - At the same kiln temperature, the sintering degree of the purple sand pot with the bright needle process in place will be higher (sintering in place, not only the color of the sand pot is correct, but also the strength of the billet is high, and the characteristics of the purple sand can be fully displayed).
Easy to bubble cultivation - Under the clay layer on the surface of the purple sand pot body, due to the lack of finishing, the mineral composition of the mud and the accumulation of particles make the blank body maintain the loose gap unique to purple sand. After the kiln, some substances in the body of the billet lose their shrinkage due to burning, so that the pot body itself produces a certain porosity without leakage.
The skin layer trimmed by the bright needle on the surface of the body becomes a special and dense sintering layer after firing, which directly affects the formation of the coating film.