Pamuk ve Karışık İplik Boyutu için Polivinil Alkol (PVA)

Ürün Adı: Pamuk ve Karışık İplik Boyutu için Polivinil Alkol (PVA)
Fabrika Sitesi: Lingwu, Yinchuan, Ningxia, Çin
Fiyat Teklifi: sales2@liwei-chem.com
Üretici: Anhui Liwei Chemical Co., Limited.
ŞİMDİ İLETİŞİM

Pamuk ve Karışık İp Boyutu için Polivinil Alkol (PVA), tipik olarak, warp iplik tipi ve istenen boyut ekleme ve pişirme sıcaklığı ve çözüm viskozitesi belirli aralıklarda kontrol edilmeli olduğu formülasyonlarda kullanılır.

Spesifikasyonlar

HS Kodu	875726
Kimyasal Adı	polivinil alkol
Cas Numarası	9002-89-5
Moleküler Formül	(C2H4O) n
Dış Görünüş	Beyaz ile soluk sarı toz veya granül
Çözünürlük	80 ° C'nin üzerindeki sıcak suda çözünür, yaygın organik çözücülerde çözünmez
Hidroliz Derecesi	87-99% sınıfa bağlı olarak
Viskozite 4 Sulu çözüm 20 C	5-50 mPa · s
Ph 4 Sulu çözüm	5.0-7.0
Sağlam Içerik	% 94
Film Oluşturma Yeteneği	Harika
Film çekme Dayanımı	Yüksek
Pamukla Yapışkanlık	İyi
Aşınma Direnci	İyi
Karışım Uyumluluğu	Pamuk ve sentetik karışık iplikler için uygundur

Akrediteli bir Pamuk ve Karışık İplik Boyutu için Polivinil Alkol (PVA) fabrikası olarak, her seri tutarlı etkinlik ve güvenlik standartlarını sağlamak için sıkı testlerden geçirilir.

Paketleme ve Depolama

Paketleme	İplik boyutu için polivinil alkol, iç polietilen astarlı 25 kg çok katmanlı kağıt torbalarda tedarik edilir.
Konteyner Yükleme (20' FCL)	20 'FCL: 25 kg torbalarda paketlenen PVA tozu, paletli, konteyner başına yaklaşık 20 MT, güvenli ve kuru.
Nakliye	Pamuk ve karışık iplik boyutu için polivinil alkol (PVA), su çözünür bir toz veya granül olarak mühürlenmiş çok katmanlı kağıt torbalarda, nem geçirmez astarlarda veya FIBC toplu torbalarda gönderilir. Nem emilmesini, karıştırmayı veya kirlenmeyi önlemek için kuru, havalandırılmış kaplarda taşıyın. Isı, nem ve oksidanlardan uzak saklayın.
Depolama	Polivinil Alkolu nem, doğrudan güneş ışığı ve ateşme kaynaklarından uzak, serin, kuru, iyi havalandırılmış bir alanda saklayın. Kapakları sıkıca sızdırdırın ve bulaşmayı veya kirlenmeyi önleyin. Toz oluşturmaktan kaçının; kullanırken uygun havalandırma ve PPE kullanın. Kararlı bir sıcaklık koruyun ve tutarlı iplik boyutu performansı için kaliteyi korumak için İlk Giriş, İlk Çıkış rotasyonunu takip edin.
Raf ömrü	Raf ömrü: Nem ve doğrudan güneş ışığından uzak, serin, kuru bir yerde saklandığında 12 ay.

Pamuk ve Karışık İplik Boyutu için Polivinil Alkol (PVA) Uygulaması

What Happens to Size Film Integrity When Desizing Enzyme Activity Is Prematurely Triggered?

A persistent failure mode on high-speed slashers processing carded cotton warps arises from residual biological contaminants on unsourced greige yarn interacting with partially hydrolyzed PVA film. Cotton waxes and pectins, when not fully removed in pre-wet scouring baths operating below 85°C, create localized acidic microsites within the dried size film. These sites initiate autocatalytic cleavage of acetate groups in partially hydrolyzed grades (degree of hydrolysis 88–92 mol%), reducing film toughness by as much as 40% before the loom beam reaches the weaving shed. Warp stops on air-jet looms running at insertion rates exceeding 1,200 m/min spike sharply when film elongation at break drops below 150% (ASTM D882-18). The corrective protocol adopted by multiple denim mills in Türkiye and Pakistan specifies a two-stage wet splitting approach: a first bath maintained at 90°C with 0.3–0.5 g/L of a nonionic wetting agent (alkyl polyglucoside type, cloud point> 95°C), followed by a squeeze-roll nip pressure of 8–10 N/mm² to achieve 65–70% wet pick-up before entering the size box. This sequence removes mechanically bound impurities without thermally shocking the cotton fiber lumen, which would otherwise collapse and trap size within the convolution structure—a defect manifesting as uneven dye uptake in subsequent reactive dyeing at liquor ratios below 1:8.

Parallel-to-Fiber Orientation: Rheological Thresholds for Low-Humidity Weaving Sheds

Cotton spinning mills supplying warps destined for air-jet weaving in climate-controlled sheds maintained at 50–55% RH encounter a distinct set of sizing compound requirements that reshape PVA grade selection logic entirely. Standard medium-viscosity grades (20–30 mPa·s, 4% aqueous solution at 20°C, DIN 53015) formulated with starch ethers at 60:40 blend ratios produce adequate abrasion resistance under ISO 12947-2 Martindale testing at 65% RH, yet shed excessively under drier conditions due to a glass transition temperature that drifts upward from 45°C to nearly 58°C as equilibrium moisture content falls below 6%. The resulting brittle fracture at the reed generates fine particulate that accumulates on drop-wire contacts, triggering false warp stops. Production logs from a vertically integrated mill in Suzhou indicate that switching to a low-DP (500–700) fully hydrolyzed grade (≥98.5 mol%) with a 4% solution viscosity not exceeding 5.5 mPa·s reduces size shedding by 62% compared to the medium-viscosity control, measured gravimetrically using a Shirley dust-hood apparatus positioned downstream of the reed. The mechanism is twofold: shorter polyvinyl alcohol chains crystallize more rapidly from the solvated state, forming a denser film with fewer amorphous-region defects; additionally, the lower melt viscosity at the nip point (85–90°C) promotes capillary-driven penetration into the yarn core rather than surface-limited coating, shifting failure mode from adhesive delamination to cohesive fibrillation—the latter being inherently less dust-generating.

Polyester/Cotton 65/35 Blends: Managing Differential Wetting Kinetics

The thermodynamic incompatibility between hydrophobic polyester staple fiber (surface energy 43 mN/m) and hydrophilic PVA (surface energy of dried film approximately 50–55 mN/m) creates a persistent film-adhesion deficit at polyester fiber boundaries within intimate blend yarns. When a size formulation based on a 1:1 blend of fully hydrolyzed PVA (98.0–98.8 mol%) and oxidized corn starch is applied at 9–11% solid content to a Ne 30/1 polyester/cotton 65/35 ring-spun yarn, optical microscopy of cross-sections stained with iodine-potassium iodide reveals discontinuous film coverage specifically at fiber-fiber junctions where two or more polyester ends converge. This triple-point region acts as a crack initiation site under cyclic loading on the loom. The engineering response, validated on a Benninger Sizeline slasher operating at 80 m/min, involves pre-blending a plasticizing co-monomer into the size formulation: 3–5 wt% (on PVA solids) of a medium-molecular-weight polyethylene glycol (PEG 4000) added to the cooker at 60°C prior to PVA dissolution. The PEG reduces the PVA film’s surface tension during the wet-on-wet application phase, measured as a contact angle decrease on PET film from 62° to 41° (sessile drop method, Krüss DSA100). More critically, the PEG functions as a fugitive plasticizer that evaporates slowly during cylinder drying at 130°C surface temperature, leaving behind a microporous film structure with enhanced compliance at fiber interstices without permanently reducing film tensile strength below the 28 MPa threshold (ASTM D882).

Starch-Replacement Economics in Regions with Inconsistent Tapioca Supply Chains

Cassava starch price volatility in Southeast Asian markets during monsoon quarters has driven a structural shift toward PVA-dominated size formulations that would be considered economically nonviable in maize-growing regions. A formulation consisting of 85% partially hydrolyzed PVA (degree of hydrolysis 86–89 mol%, viscosity 12–15 mPa·s) and 15% acrylic copolymer binder (Tg −10°C) applied at 6–7% solid add-on to Ne 40/1 combed cotton warps produces weaving efficiency figures on Toyota JAT810 air-jet looms that are statistically indistinguishable from a 50:50 PVA/thin-boiling starch control when measured over 10,000-pick production runs. The critical processing window that prevents this high-PVA formulation from causing blocking on the size box cylinders is a post-nip pre-dryer infrared pre-heating zone set to deliver 18–22 kW/m² radiant flux, rapidly raising film surface temperature above the blocking threshold of 72°C before the first can contact point. Recommended cylinder coating: polytetrafluoroethylene-impregnated hard chrome with surface roughness (Ra) maintained below 0.4 μm; routine polishing with 600-grit abrasive mesh every 300 operating hours is necessary when processing this formulation, as gradual PVA film build-up increases Ra beyond 0.8 μm and initiates wrap-around events.A second operational boundary concerns desizing effluent. This high-PVA formulation requires oxidative desizing with hydrogen peroxide (4–6 g/L, 35% w/w) at 90–95°C in the presence of 2–3 g/L sodium persulfate activator to achieve>95% PVA removal within 20 minutes (iodine spot-test verification, TEGEWA scale 7–8). Mills without pressurized desizing jigs capable of sustained 95°C operation should not adopt this formulation.

Comparative Weaving Performance: PVA-Dominant vs. Starch-Co-Formulation on **Ne 40/1** Combed Cotton (Air-Jet, **950 rpm**)
Parameter	85% PVA /15% Acrylic	50:50 PVA /Thin-Boiling Starch
Size add-on (% o.w.f.)	6.3	10.8
Breaking strength increase (%)	22.4 (ASTM D2256)	19.1
Elongation at break (%)	5.8		4.2
Abrasion cycles to failure (CTT-C, yarn-on-yarn)	1,840	1,215
Shedding mass collected @ reed (mg/10⁵ picks)	78	143
Desizing residual PVA (TEGEWA rating)	7.5	8.0
COD load in combined desize/scour effluent (mg/L)	2,400	1,850

This table does not capture seasonal incoming yarn coefficient of variation (CV%) effects; when CV% of single-end yarn strength exceeds 8.5%, the high-PVA formulation’s advantage in abrasion resistance narrows considerably due to weakest-link failure dynamics undetectable in standard bundle-yarn tensile testing.

Cold-Water-Soluble Grades for Pre-Wetting-Free Slashers: An East African Operational Profile

Mills in Ethiopia and Tanzania operating second-generation slashers without pre-wet boxes routinely process warps where the size must penetrate, film-form, and bond within the available immersion path length of 1.2–1.5 meters at machine speeds of 50–60 m/min. Under these constraints, conventional fully hydrolyzed PVA requiring 30–40 minutes of cook time at 95–98°C to reach full dissolution is operationally impractical. Grades specifically engineered for cold-water dispersibility (DP 500, carboxyl-modified with 1.2–1.8 mol% itaconic acid comonomer) achieve 99% dissolution at 25°C within 15 minutes of agitation in a conventional size box circulation loop. The introduced carboxyl groups disrupt inter-chain hydrogen bonding sufficiently to depress the crystalline melting point from 228°C (unmodified fully hydrolyzed PVA) to approximately 190°C, while raising equilibrium moisture regain from 5.8% to 7.4% at 65% RH—beneficial for weaving shed humidity compatibility but detrimental if the sized beam is stored for more than 48 hours in ambient conditions exceeding 75% RH, where blocking between yarn layers becomes measurable as a 15–20% increase in unwinding tension (Schmidt tension meter, 5-roller path). Field data from a mill in Hawassa indicates that sizing formulations combining 70% cold-water-soluble PVA with 30% cassava starch and 0.5% (on size solids) of a sulfonated castor oil-based lubricant at 8% total solids produce weaving efficiencies of 91–93% on rapier looms processing Ne 20/1 carded cotton—acceptable for the mass-market sheeting segment but below the 95% threshold demanded for export-quality shirting.The limit on machine speed for this formulation is set not by slasher drying capacity but by the time required for carboxylated PVA to displace the boundary layer of water adsorbed on cotton fiber surfaces. Interfacial tensiometry (Wilhelmy plate method on single cotton fiber) shows that the critical micelle concentration of the formulation is reached only after 8–10 seconds of immersion; linear speed must be reduced accordingly or immersion path extended via additional guide rollers submerged in the size box.

When Z-Direction Yarn Hairiness Exceeds the Sizing Window: A Compact-Spun vs. Ring-Spun Divergence

Compact-spun cotton yarns present a fundamentally different substrate for PVA size film adhesion compared to conventional ring-spun equivalents. The near-complete elimination of the spinning triangle during compact yarn formation reduces protruding fiber ends (hairiness index measured on Uster Zweigle HL400, hairiness length class 3 mm and above) by 60–70%. While this yields a smoother base yarn requiring less size add-on to achieve weaving-quality surface characteristics, it also removes the mechanical interlocking sites where size film anchors into the yarn periphery. PVA size film on compact yarns consequently relies almost entirely on interfacial adhesion rather than mechanical keying, making the degree of hydrolysis of the selected PVA grade the dominant performance variable. Fully hydrolyzed grades (≥98.5 mol%) exhibit higher hydrogen-bonding density to cellulose hydroxyl groups (quantifiable via FTIR peak shift of the O-H stretching band from 3,340 cm⁻¹ to 3,290 cm⁻¹) and produce statistically fewer loom stops on compact yarn warps compared to partially hydrolyzed grades at identical add-on levels. The trade-off, as documented in side-by-side trials on a Karl Mayer sizing machine processing twin Ne 50/1 compact cotton beams, is a measurable increase in size shedding at weaving shed exhaust due to the higher modulus and lower elongation at break (125% vs. 175% for grades with 88 mol% hydrolysis) of fully hydrolyzed film, which fragments rather than deforms plastically under the oscillatory tension of the shedding motion. The compromise adopted in dedicated high-count compact fabric mills is a PVA with hydrolysis degree 94–96 mol% and 4% solution viscosity of 8–10 mPa·s, applied at 5.5–7.0% add-on (gravimetric, dry-yarn basis), which splits the difference between adhesion and film toughness within an acceptably narrow process window.Ring-spun yarns in the same count range tolerate far wider specification bands for PVA grade and add-on percentage, a robustness that arises from the aforementioned mechanical anchoring to surface loops—a reminder that advanced spinning technology, while reducing downstream sizing chemical demand, demands tighter incoming raw material control on the part of the weaver.

Blends Beyond Polyester: PVA Sizing on Cotton/Lyocell Intimate Blends

Lyocell fiber’s characteristic fibrillation behavior under wet abrasion—deliberately exploited in peach-skin finishing but catastrophic for sized warp stability during high-density weaving—introduces a sizing complication absent in cotton/polyester blends. During the size box immersion phase, lyocell swells radially by 40–50% (cross-sectional area increase, optical micrometer measurement under 20°C water immersion), which is nearly double the swelling magnitude of cotton. A PVA film formed around a swollen lyocell fiber develops internal tensile stress upon drying as the fiber diameter contracts to near-original dimensions; this stress, if not relieved by plastic deformation of the film, initiates circumferential cracking visible under SEM at 2,000× magnification. Grades of PVA with elongation at break exceeding 200% (typically partially hydrolyzed, 86–89 mol%, DP 1,700–2,000) accommodate the dimensional recovery without fracturing. The formulating constraint: when lyocell content in the blend exceeds 30%, the size formulation plasticity requirement drives selection toward partially hydrolyzed grades that are fundamentally less adhesive to the cotton fraction. A compensating measure is the addition of 1.5–2.5 wt% (on PVA solids) of a self-crosslinking polyurethane dispersion (aliphatic isocyanate-capped, particle size <100 nm) that increases film adhesion to lyocell without raising the PVA film modulus above 80 MPa (dynamic mechanical analysis, 1 Hz, 25°C). Published data for this specific ternary system (PVA/PUD/cotton-lyocell substrate) is limited; the formulation described here is based on in-plant development trials conducted on a Benninger Sizecoat slasher operating at 70 m/min with cylinder drying profile peaking at 125°C at cans 3–5 of a 9-cylinder bank, and is considered proprietary to the originating mill group. An independent verification protocol using ASTM D2256-21 for sized yarn tensile properties and the Sulzer Ruti L5100 weaving simulation rig would be required to generalize these findings.

Regulatory Surface: REACH, ZDHC, and Global Desizing Effluent Compliance Thresholds

Compliance Standards Applicable to PVA Size Formulation Components
Standard/Regulation	Scope	Relevant Limit or Requirement
EU REACH Regulation (EC) 1907/2006	PVA polymer registration	Exempt from registration under Annex V (polymer exemption) provided monomer content below 1% residual vinyl acetate (determined by titration, ISO 9252:1989)
ZDHC Manufacturing Restricted Substances List (MRSL) 3.1	Size formulation auxiliaries	Nonylphenol ethoxylate (NPEO) concentration must be below 100 ppm in all lubricants and wetting agents blended into PVA size formulations; verified by LC-MS according to ISO 18254-1:2016
OEKO-TEX Standard 100, Annex 6 (Product Class I)	Finished fabric residual chemistry	Residual PVA is not listed as a restricted substance; complete desizing to TEGEWA scale 7–8 is assumed for certification of babywear articles under Class I requirements
German Waste Water Ordinance (AbwV), Annex 38	Textile finishing effluent	COD discharge limit of 160 mg/L (24h composite sample) applies to combined desizing/scouring wastewater; PVA contributions calculated from size add-on and desizing efficiency
GB 4287-2012 (China)	Textile dyeing & finishing effluent	COD limit 80 mg/L (direct discharge) imposes PVA recovery or oxidative destruction requirements for mills operating high-PVA-size formulations without closed-loop desizing liquor recycling

Ücretsiz Alıntı

Bütçenize uygun rekabetçi Pamuk ve Karışık İplik Boyutu için Polivinil Alkol (PVA) fiyatları - her sipariş için esnek şartlar ve özelleştirilmiş teklifler.

Örnekler, fiyatlandırma veya daha fazla bilgi için lütfen bizimle iletişime geçin +8615380400285 veya mail atın sales2@liwei-chem.com.

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Sertifikasyon ve Uyumluluk

Pamuk ve Karışık İplik Boyutu için Polivinil Alkol (PVA) ISO 9001 kalite sistemi kapsamında üretilmekte olup ilgili yasal düzenlemelere uygundur.
COA, SDS/MSDS ve ilgili sertifikalar talep üzerine temin edilebilir. Sertifika talepleri veya sorularınız için lütfen iletişime geçin: sales2@liwei-chem.com.

Daha fazla tanıtım

Pamuk ve karışık ipliklerin warp boyutu için polivinil alkol (PVA), boyutu film performansı iki moleküler parametre tarafından belirlenen su çözünür sentetik bir polimerdir: hidroliz derecesi ve polimerizasyon derecesi. Tam hidrolizlenmiş dereceler (98-99 mol%) halka içilmiş pamuğa uygulandığında, film yüksek çekme mukavemeti gösterir ancak soğuk suda çözünürlüğü sınırlıdır ve yüksek desizing sıcaklıkları talep eder. Kısmen hidroliz edilmiş dereceler (86-89 mol%), soğuk suda çözünür kalıntılar 40-60 °C, sürekli açık genişlik hazırlık aralıklarında kritik bir avantaj olan 40-60 °C'de desizing sağlarken, slasher kurutması için yeterli kristalliliği korur. Nişasta tabanlı boyutların aksine, PVA boyut kutusundaki mikrobiyal büyümeyi desteklemez ve karboksimetil selülozun (CMC) aksine, filmi bir jele yeniden ıslanmaz, ancak modern yüksek hızlı dokuma tesislerinde dökülmeyi azaltarak giderek çözünür.

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