濕紡噴絲頭
濕法紡絲是將溶液法制得的紡絲熔液從噴絲頭的細(xì)孔中壓出呈細(xì)流狀，然后在凝固液中固化成絲。由于絲條凝固慢，所以濕法紡絲的紡絲速度較低，一般為50～100m/min，而噴絲板的孔數(shù)較熔體紡絲多，一般達(dá)4000～2000孔。
濕法紡絲的特點(diǎn)是工藝流程復(fù)雜，投資大、紡絲速度低，生產(chǎn)成本較高。一般在短纖維生產(chǎn)時(shí)，通常，不能用熔體法紡絲的成纖高聚物，才用濕法紡絲和生產(chǎn)短纖維和長(zhǎng)絲束。腈綸、維綸、氯綸和粘膠多采用濕法紡絲。
Spinnerets for Wet Spinning
Process of wet spinning is used for polymers that need to be dissolved in a solvent to be spun. The spinneret is submerged in a chemical bath that causes the fiber to precipitate, and then solidify, as it emerges. The process gets its name from this "wet" bath. Acrylic, rayon, aramid, modacrylic, and spandex are produced via this process.[
A variant of wet spinning is dry jet-wet spinning, where the solution is extruded into air and drawn, and then submerged into a liquid bath. This method is used in Lyocell spinning of dissolved cellulose.
噴絲頭材質(zhì) Spinneret Material
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●?鉭 Ta
●?不銹鋼 Stainless Steel
●?金鉑合金 Compound of gold and platinum:
Au 70% Pt 30%; Au 60% Pt40%; Au 50% Pt 50%
●?金鉑銠合金 Compound of gold, platinum and Rhodium:?
Au 49.5% Pt 49.5% Rh 1%
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噴絲頭類型 Spinneret Type
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直壁帽形噴絲頭
Vertical Hat-shape Spinneret
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- 環(huán)形噴絲頭
????????????Ring Shape spinneret
- 錐形噴絲頭
????????????Taper-shaped Spinneret
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- 斜壁帽形噴絲頭
????????????Conical Shape Spinneret
- 球形噴絲頭
????????????Spherical Spinneret
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球形噴絲頭結(jié)構(gòu)新穎，噴絲孔分布在具有一定曲率半徑的球形面上，噴出的絲束呈放射狀，凝固條件好。適用于晴綸、維綸、粘膠、混紡纖維所要求的大面徑，多孔數(shù)，高速高產(chǎn)的噴絲頭。
The Sphere-shaped spinnerets have the advantages of new structure that holes scatter on the sphere surface with certain curvature radius, in order to radiate fibers, which leads to better condensation.? It is used for producing PAN, Vinylon, viscose fiber with high speed and productivity.
- 瓦型噴絲頭
????????????Tile-shaped Spinneret
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