醋酸纤维素这行，市场上叫“CA副牌”的货比真货还多——有人拿回收片基压碎了当CA，有人把低等级醋片掺进注塑料里卖。CA这东西，原料端长期被几家大厂攥着，小厂根本做不出合格的二醋酸纤维素片。国产CA的水有多深，得先从南通醋酸纤维这口井说起。
CA是什么，国产格局
CA（醋酸纤维素，通常指二醋酸纤维素CDA）由纤维素经醋酸酯化而来，分拉丝用的丝束和注塑、薄膜用的片（醋片）两大类。它手感温润、光学透明、易着色，眼镜框、手柄、玩具、薄膜、香烟过滤丝束都在用。全球CA长期由伊斯曼、塞拉尼斯等主导。国内这头，南通醋酸纤维有限公司（南纤）是中国较早的醋酸纤维生产企业，由中国烟草总公司与美国塞拉尼斯合资建设，丝束年产能约10.8万吨、醋片约21.5万吨，丝束规模居全球前列、亚洲领先，醋片国内市占率很高，主导制定了醋片国家标准和丝束行业标准。国内另一主要玩家四川普什醋酸纤维素依托五粮液系布局西南。用于注塑和薄膜的CA粒料，原料醋片主要就来自这几家，南纤是绕不开的源头。注塑级CA这两年需求在回暖，文具手柄、眼镜框、玩具、薄膜印刷这些老场景外，电子烟烟具、化妆品外壳等新用途也在拉动，国内能稳定供高等级醋片的渠道并不多。
CA副牌从哪来，和回收片基怎么分
CA副牌来自醋片或丝束装置开停车料、牌号切换过渡料、工艺波动致结合酸或色相小幅偏离的批次。它仍是原厂原生二醋酸纤维素片，结合酸值略偏、色相略深，但基材与正牌一致。要把CA副牌和回收片基分清：回收片基（电影胶片、摄影底片压碎）已经历热历史和添加剂污染，性能波动大、杂质多；原厂副牌是一次聚合产物。别拿回收片当CA副牌，往透明或食品接触件上用。CA副牌按结合酸值和粘度分档，结合酸值决定溶解性和熔融行为，注塑前要测。
头部企业深度分述：南通醋酸纤维
南纤1987年成立，位于南通，三十多年专注醋酸纤维素，从醋片到丝束一体化。它的主产品是烟用二醋酸纤维素丝束和醋片，醋片除自用做丝束外也外供下游。注塑级CA粒料用的就是这一类高等级醋片再加工，南纤在结合酸值控制、色相和杂质控制上积累深，建有行业认可的检测实验室和博士后工作站。其副牌多来自装置开停车和牌号切换，结合酸值小幅偏离、色相略黄，但溶解和成膜成塑性能与正牌同体系。对一般手柄、玩具、非透明结构件、工业薄膜，副牌替代进口CA片的性价比突出。第二梯队里，四川普什醋酸纤维素在西南扩产，珠海醋纤等有丝束产能，但注塑级高等级醋片的国内供应仍以南纤为主要源头，仅作行业背景。南纤醋片除了供国内丝束厂，也长期出口，批次一致性和杂质控制在国内这一档里是经过长期市场验证的。
CA副牌选购避坑
第一，先测后签。CA结合酸值和粘度批次差异影响溶解和注塑，客户先取样测结合酸值、粘度、灰分，确认后再签批量合同。第二，辨回收片，看色泽均匀度和杂质，回收片基发暗、有黑点和胶块。第三，看用途，透明、光学、食品接触件必须正牌，副牌用于一般结构件。第四，控水分，CA吸潮，注塑前充分干燥，副牌含水率高会银纹发雾。第五，对牌号，醋片牌号按结合酸值分，别拿丝束级料凑注塑级。另外CA塑化加工温度敏感，副牌按低限温度试机，避免降解变色。CA干燥时间比普通聚烯烃长，建议80到100度烘4到6小时，烘完用多少取多少，返潮的料再烘一遍再上机。
科隆仓库现货
科隆仓库现货主推品牌：南通醋酸纤维CA醋片副牌料。主要牌号：手柄、玩具、薄膜、工业件用注塑级CA专用料。包装规格：小包装与大包装（吨袋）均有备货。仓库现货通常在5000吨左右，其中小包副牌备货800-1000吨、箱装副牌备货300-500吨、大包料/吨包料备货3500-3900吨。供应保障：先测后签，客户先取样测结合酸值、粘度、灰分，指标确认后再签订批量供货合同。注塑、薄膜、眼镜框、玩具客户可报制品类型询价。
选型口诀与案例
国产CA副牌选料三句话：酸值先测再签，回收片别当副牌，透明件走正牌。
In the cellulose acetate industry, there are more 'CA sub-brands' on the market than genuine products—some crush recycled sheet bases to make CA, while others mix low-grade vinegar tablets into injection molding to sell. CA's raw materials have long been dominated by a few big manufacturers; smaller factories simply can't produce qualified cellulose diacetate tablets. To understand how deep the waters for domestic CA are, we have to start with the well of Nantong cellulose acetate. What is
CA? The domestic
CA (cellulose acetate, usually referring to cellulose diacetate CDA) is derived from cellulose esterified by acetate, and is divided into two main categories: wire bundles for drawing and sheets for injection molding and film (vinegar tablets). It feels smooth to the touch, is optically transparent, and easy to color, and is used in eyeglass frames, handles, toys, films, and cigarette filter tows. Global CA has long been dominated by Eastman, Celanese, and others. Domestically, Nantong Acetate Fiber Co., Ltd. (Nanxian) is one of China's earliest acetate fiber manufacturers, jointly established by China National Tobacco Corporation and the American Celanese. Tow's annual capacity is about 108,000 tons and vinegar flakes about 215,000 tons. Tow's scale is among the world's top and Asia's leading, with a high domestic market share for vinegar flakes and leading the formulation of national and tow industry standards. Another major domestic player, Sichuan Pushi Acetate Cellulose relies on the Wuliangye system to expand its Southwest region. CA granules used for injection molding and film mainly come from these companies, with Nanxian Fiber being an unavoidable source. Demand for injection-molded CA has been recovering in recent years. Besides old scenarios like stationery handles, eyeglass frames, toys, and film printing, new uses like e-cigarette smoking devices and cosmetic shells are also being promoted. There are few domestic channels that can reliably supply high-grade vinegar tablets. Where does
CA sub-brand come from, and how is it separated from recycled sheet base
CA Sub-brand comes from batch of vinegar tablets or tow device start-stop materials, grade switching transition materials, and batch fluctuations that cause slight acid or color deviation. They are still original original dianate cellulose sheets, with slightly biased bonding acid and slightly darker hue, but the substrate is consistent with the genuine brand. Distinguish between the CA sub-brand and the recycled film base: the recycled film base (film film, photographic film crushed) has undergone thermal history and additive contamination, with large performance fluctuations and many impurities; The original sub-brand is a primary polymerization product. Do not use recycled sheets as CA sub-brands; use them on transparent or food-contact parts. CA sub-plates are classified by binding acid value and viscosity; the acid value determines solubility and melting behavior, and must be tested before injection molding.
In-depth analysis of leading companies: Nantong Acetate Fiber
Nanxian Fiber was established in 1987 and located in Nantong, focusing on cellulose acetate for over thirty years, integrating everything from vinegar flakes to tows. Its main products are tobacco diacetate cellulose tow bundles and vinegar flakes. Besides domestic use for tows, vinegar flakes are also supplied downstream. Injection-grade CA pellets are used for reprocessing of this type of high-grade vinegar flake. Nanxian has deep experience in combined acid value control, hue, and impurity control, and has established industry-recognized testing laboratories and postdoctoral workstations. Its sub-brands mostly come from device start/stop and grade switching, combined with slight deviations in acid value and slightly yellow hue, but their dissolution and film-forming and plasticizing performance are the same as genuine brands. For general handles, toys, non-transparent structural parts, and industrial films, sub-brands offer outstanding cost-performance as a substitute for imported CA sheets. In the second tier, Sichuan Pushi cellulose acetate is expanding production in Southwest China, and Zhuhai Vinegar Fiber has tow production capacity, but domestic supply of injection-molded high-grade vinegar chips still mainly comes from Nanxian, serving only as an industry background. Besides supplying domestic tow factories, Nanxian vinegar chips have also been exported long-term. Batch consistency and impurity control have been validated by the domestic market over time.
CA avoid pitfalls when selecting sub-brands
First, test before signing. Differences in CA bond acid value and viscosity batches affect dissolution and injection molding. Customers first take samples to measure bonding acid value, viscosity, and ash content, and only sign batch contracts after confirmation. Second, identify the recycled sheets by checking color uniformity and impurities; the recycled sheets have dark bases, black spots, and glue blocks. Third, consider the intended use: transparent, optical, and food contact parts must be genuine brands; sub-brands are used for general structural parts. Fourth, moisture control: CA absorbs moisture and is thoroughly dried before injection molding; secondary brands with high moisture content may cause silver grain fogging. Fifth, regarding grades, vinegar tablet grades are classified by bonding acid value; do not use tow grade material for injection molding. Additionally, CA plasticizing processing is sensitive to temperature; secondary brands test machines at low temperature limits to avoid degradation and discoloration. CA drying time is longer than ordinary polyolefins; it is recommended to dry at 80 to 100°C for 4 to 6 hours. After drying, take only what you need. If moisture reappears, dry again before reloading into the machine.
Cologne Warehouse Stock
Cologne Warehouse Stock Main recommended brands: Nantong Acetate Fiber CA Vinegar Tablet Secondary Brand Material. Main grades: Injection-molded grade CA special material for handles, toys, film, and industrial parts. Packaging Specifications: Both small and large packages (ton bags) are stocked. Warehouse stock is usually around 5000 tons, with 800-1000 tons for small sub-labels, 300-500 tons for boxed sub-labels, and 3500-3900 tons for large packages/ton packaging. Supply guarantee: test before signing. Customers first take samples to measure acidity, viscosity, and ash content; after confirming the indicators, a bulk supply contract is signed. Injection molding, film, eyeglass frames, and toys Customers can request product type quotes.
Selection Mnemonics and Cases
Domestic CA Secondary Brand Material Selection Three Sentences: Acid value first tested before signing; recycled pieces do not use as secondary brands; transparent parts are genuine brands
