What material is BTC high quality screen
reference: http://emuch.net/journal/article.php?id=CJFDTotal-JZJI199312009
The full name of superfine fiber leather is "superfine fiber polyurethane synthetic leather"
It is a new high-grade leather in synthetic leather. Pu is polyurethane. Polyurethane leather has excellent properties After adding the superfine fiber, the stiffness of the silk is greatly reced e to the extremely fine size, and the fabric feels extremely soft. The fine fiber can also increase the layered structure of the silk, increase the specific surface area and capillary effect, and make the internal reflected light of the fiber distribute more delicately on the surface, so that it has the elegant luster like silk, and has good moisture absorption The toughness, air permeability and wear resistance of polyurethane were further strengthened. There is no doubt that such a finished proct has excellent performance. Because of its fine structure, it is called super fiber. It has the advantages of wear resistance, cold resistance, air permeability, aging resistance, soft texture and beautiful appearance. It has become an ideal choice to replace natural leatherthe clothing made of superfine fiber is comfortable, beautiful, warm and breathable. It has good drapability and fullness, and has obvious improvement in hydrophobicity and antifouling. Different organizational structures can be designed by using the characteristics of large specific surface area and softness, so that it can absorb more sunlight and heat energy or lose body temperature more quickly, playing the role of warm in winter and cool in summer
extended data:
the formation of high-quality super fiber leather material
the first step for high-quality super fiber leather material is to realize the ultra-fine fiber (skeleton material) with similar structure and performance to bundle collagen fiber in natural leather; Secondly, nonwovens with three-dimensional network structure (needling or Spunlaced) should be used; Finally, PU resin with excellent refilling performance, microporous structure and high toughness is processed
The origin of fiber superfine research can be traced back to the 1940s. DuPont is the first company to use synthetic fiber and successfully instrialize composite fiber. From 1962 to 1965, Toray, Zhongfang, teiren, Keli and other companies in Japan successfully proced their own unique superfine fibers, such as multi-core, wood grain, radial, hollow radial and other composite fibers In the late 1970s, Toray company developed a very uniform fiber technology by analyzing natural fibers. After the 1980s, superfine fiber was welcomed by consumers, forming an upsurge of artificial suedesince the 1990s, many international companies have launched polyester, polyamide, polyacrylonitrile, polypropylene and other filament fibers. At the same time, some terms such as "fine denier fiber", "micro fiber" and "ultra-fine fiber" also appeared. Later, the Japanese chemical fiber instry generally called the fiber with single filament linear density less than 0.3dtex as ultra-fine fiber, which was also accepted by many companies in the instry
advantages of high-quality super fiber leather material
because it is thinner than traditional fiber, it has more fluffy and soft touch than ordinary fiber. It can overcome the shortcomings of natural fiber easy to wrinkle and man-made fiber airtight. In addition, high-quality super fiber leather material also has many irreplaceable excellent characteristics, such as heat preservation, no mildew, no moth, light weight, waterproof and even water absorption
source: Network - Microfiber
businesses may label high quality fabric
Shell is a kind of organic gem, its composition is calcium carbonate; Hardness: 2.5; The dorsal shell of hawksbill turtle is amorphous, slightly transparent to translucent, waxy to greasy
how to identify the authenticity of tortoiseshell:
one of the solutions
strong light irradiation method: when the tortoiseshell is projected under strong light or flashlight light, transparent beautiful patterns can be seen, transparent blood like deep into the nail plate, and its color spots are numerous round spots, such as millet dots gathered together, forming irregular borders. On the surface of the imitated proct, the blood filaments are flake, mottled, rigid or lumpy
Polishing method: after polishing, the tortoiseshell pieces present a unique luster and charm. Imitations do not have this featureburning method: when the scraping powder is ignited or touched with hot needle, the real proct will have the smell of scorched hair. The imitated procts have peculiar smell, bakelite and tartaric acid smell; Celluloid has camphor smell; Safety celluloid and casein plastics are vinegar flavored
The density of tortoiseshell was 1.29g/cm3. The plastic imitation is 1.05-1.10g/cm3, which is easy to distinguishsection observation method: the tortoiseshell was soaked in warm water and softened, and the sections were observed with a magnifying glass or microscope. The red and brown spherical particles could be seen, and the color spots were round pigment dots, with a clear striped structure. Plastic procts with strip, visible boundary obvious ribbon
the difference between natural tortoise shell and pressed tortoise shell is that the color of imitation tortoise shell becomes darker after being heated, and there are empty bubbles, which are elongated. Natural tortoiseshell is the opposite
However, from the side view, it can be seen that there are color differences between different pieces; With a magnifying glass, there are traces of glue and resial bubblesthe difference between tortoiseshell and ox horn: generally, the ox horn does not have the pattern of tortoiseshell (that is, the pattern of red, black, transparent and yellow), and the pattern of tortoiseshell is glossy, transparent and beautiful
when the big tortoise shell is fished out of the water, the water will disperse around, so the tortoise shell can avoid fog, water and wind
boiling water heating method: the shape of tortoise shell can be bent without breaking after boiling water, while the shape of imitation tortoise shell can be bent easily after boiling water
scheme 2
look at the color: tortoiseshell is yellowish brown, translucent, soft luster, transparent and bright, with a warm feeling; Imitation tortoiseshell is made of celluloid, bakelite, resin and other chemical substances. Compared with the real tortoiseshell, its color lacks a clear and warm feeling, which makes it dry and astringent; The fake hawksbill made of ox horn is not as bright as hawksbill, and there is no red, black, transparent and yellow mixed hawksbill spots, so it is easy to appear cracks in the process of use
look at the stripes: there are colorful black and brown stripes inside the scales of real tortoiseshell, which are composed of numerous dots of different sizes. The denser the dots are, the deeper the color is. The stripes are clear, beautiful and transparent, especially with the change of shade and natural interest; The markings of imitation tortoiseshell are often brownish red, and the boundary between them and the translucent background is fuzzy, which is not as clear as that of the real tortoiseshell, and the markings are flat and rigid, with no shade change and halo color
odor identification: scrape off some powder from the bottom or inconspicuous part of the proct, burn it with fire or touch it with hot needle, the real tortoiseshell will not solidify and give out the smell of scorched hair; The imitations are different, bakelite gives off acid smell, celluloid gives off camphor smell, casein plastic gives off vinegar smell
observe the light transmission effect: under the strong light or spotlight, the blood lines of the genuine tortoiseshell are filiform and deep into the nail plate; On the other hand, the blood lines of the imitations are in the shape of flakes or lumps, which are located on the surface of the nail plate. In addition, the yellow and transparent parts of genuine hawksbill will emit light blue fluorescence under ultraviolet light, while the imitation does not
water quality: the genuine tortoiseshell has the function of "avoiding water", and the water will disperse around when it is fished out from the water; This is not the case with imitations
in order to ensure its toughness and plasticity, the carbon content is generally not more than 1.7%. Besides iron and carbon, the main elements of steel are silicon, manganese, sulfur and phosphorus
refers to iron carbon alloy with carbon content less than 2%. According to the composition, it can be divided into carbon steel and alloy steel. It can be divided into structural steel, tool steel and special performance steel according to their properties and uses< There are many kinds of classification methods for steel, the main methods are as follows:
1. Classification by quality
(1) ordinary steel (P ≤ 0.045%, s ≤ 0.050%)
(2) high quality steel (P and s ≤ 0.035%) (3) high quality steel (P ≤ 0.035%, s ≤ 0.030%)
2 (1) carbon steel: A. low carbon steel (C ≤ 0.25%); b. Medium carbon steel (C ≤ 0.25 ~ 0.60%); c. High carbon steel (C ≤ 0.60%)< (2) alloy steel: A. low alloy steel (total content of alloy elements ≤ 5%), B. medium alloy steel (total content of alloy elements > 5 ~ 10%), C. high alloy steel (total content of alloy elements > 10%)< According to the forming methods: (1) forged steel 2) Cast steel 3) Hot rolled steel 4) Cold drawn steel< (1) A. hypoeutectoid steel (ferrite + pearlite) B. eutectoid steel (pearlite) C. hypereutectoid steel (pearlite + cementite) d. ledeburite steel (pearlite + cementite)< (2) normalized state: A. pearlite steel; b. Bainitic steel; c. Martensitic steel; d. Austenitic steel< (3) no phase transformation or partial phase transformation
5. Classification by use
(1) construction and engineering steel: A. ordinary carbon structural steel; b. Low alloy structural steel; c. Reinforced steel
(2) structural steel A. steel for mechanical manufacturing: (a) quenched and tempered structural steel b) Surface hardening structural steel: including carburizing steel, ammonia steel, surface hardening steel c) Easy cutting structural steel d) Cold plastic forming steel: including cold stamping steel, cold heading steel. b. Spring steel C. bearing steel
(3) tool steel: A. carbon tool steel; b. Alloy tool steel; c. High speed tool steel< (4) special performance steel: A. stainless acid resistant steel; B. heat resistant steel including oxidation resistant steel, heat strength steel and gas valve steel; C. electric heating alloy steel; d. Wear resistant steel; e. Low temperature steel; f. Electrical steel
(5) professional steel, such as bridge steel, ship steel, boiler steel, pressure vessel steel, agricultural machinery steel, etc< (1) ordinary steel A. carbon structural steel: (a) Q195; (b) carbon structural steel (a) Q195; (c) carbon structural steel (c) Q195; (c) carbon structural steel (c) Q195; (c) carbon structural steel (c) Q195 b) Q215(A、B)( c) Q235(A、B、C)( d) Q255(A、B)( e) Q275 b. (2) high quality steel (including high quality steel)
A. structural steel: (a) high quality carbon structural steel b) Alloy structural steel c) Spring steel d) Easy cutting steel e) Bearing steel< (f) high quality structural steel for specific purposes< B. tool steel: (a) carbon tool steel b) Alloy tool steel c) High speed tool steel. c. Special performance steel: (a) stainless acid resistant steel b) Heat resistant steel< (c) electrothermal alloy steel d) Electrical steel e) High manganese wear resistant steel< (1) according to the furnace type, A. open hearth steel: (a) acid open hearth steel; (b) acid open hearth steel; (c) acid open hearth steel; (c) acid open hearth steel; (c) acid open hearth steel; (c) acid open hearth steel b) Basic open hearth steel< B. converter steel: (a) acid converter steel b) Basic converter steel. Or (a) bottom blown converter steel b) Side blown converter steel c) Top blown converter steel< Electric furnace steel: (a) electric arc furnace steel b) ESR steel c) Inction furnace steel d) Vacuum consumable furnace steel e) Electron beam furnace steel< (2) according to deoxidation degree and pouring system, A. rimmed steel; b. Semi killed steel; Killed steel; d. Special killed steel.
high temperature ceramics include Jingdezhen ceramics
medium temperature ceramics include Jingdezhen bone ceramics and Tangshan bone ceramics
when the "anba" brand mine cable hook is installed underground, it can not only rece the labor intensity of workers, improve work efficiency, but also rece the project cost
"an Ba" mine cable hook is anti-aging and corrosion resistant, and its normal service life can be up to 50 years.
"anba" brand mine cable hook is anti swing, after combination, the upper and lower parts are on the same center line, and will not swing left and right, which is more beautiful and reliable
"anba" brand mine cable hook is healthy and environmentally friendly - the material can be recycled.
SPCC -- cold rolled carbon steel sheet and strip, symbol: S-STEEL, P-plate, c-cold, the fourth c-common
its chemical composition and mechanical properties are equivalent to Chinese brands Q195 and q215a.