{"id":8835,"date":"2026-04-30T10:39:58","date_gmt":"2026-04-30T02:39:58","guid":{"rendered":"https:\/\/www.recycle-plant.com\/?post_type=info&p=8835"},"modified":"2026-05-27T18:27:23","modified_gmt":"2026-05-27T10:27:23","slug":"fiber-grade-rpet-flakes","status":"publish","type":"info","link":"https:\/\/www.recycle-plant.com\/vi\/fiber-grade-rpet-flakes.html","title":{"rendered":"\u0110i\u1ec1u G\u00ec X\u00e1c \u0110\u1ecbnh Ch\u1ea5t L\u01b0\u1ee3ng T\u1ea5m V\u1ea3y rPET?"},"content":{"rendered":"

In the recycled plastics commodity market, not all PET flakes are valued equally. The pricing hierarchy is strictly dictated by downstream application requirements. At the upper echelon of mechanical recycling sits the production of fiber grade rPET flakes<\/strong>. These materials are not destined for low-tier packaging strapping or thick injection molding; they are engineered for the chemical spinning of Polyester Staple Fiber (PSF) or continuous filament yarns.<\/p>\n\n\n\n

Khi c\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t d\u1ec7t k\u00e9o nh\u1ef1a polymer qua c\u00e1c l\u1ed7 kim spinneret vi m\u00f4 (th\u01b0\u1eddng d\u01b0\u1edbi 0,3 mm \u0111\u01b0\u1eddng k\u00ednh), \u0111\u1ed9 dung sai v\u1ec1 v\u1eadt ch\u1ea5t v\u00e0 h\u00f3a h\u1ecdc h\u1ea7u nh\u01b0 b\u1eb1ng kh\u00f4ng. B\u1ea5t k\u1ef3 sai l\u1ec7ch n\u00e0o trong t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a polymer s\u1ebd d\u1eabn \u0111\u1ebfn \u0111\u1ee9t s\u1ee3i, t\u1eafc ngh\u1ebdn nhanh c\u1ee7a b\u1ed9 l\u1ecdc ch\u1ea3y, v\u00e0 th\u1eddi gian ng\u1eebng s\u1ea3n xu\u1ea5t \u0111\u1eaft \u0111\u1ecf. V\u00ec v\u1eady, ti\u00eau chu\u1ea9n ch\u1ea5t l\u01b0\u1ee3ng c\u1ee7a m\u1ea3nh rPET c\u1ea5p s\u1ee3i kh\u00f4ng mang t\u00ednh ch\u1ee7 quan; n\u00f3 \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1edfi gi\u1edbi h\u1ea1n \u0111o l\u01b0\u1eddng ch\u1eb7t ch\u1ebd v\u1ec1 c\u00e1c ch\u1ea5t \u00f4 nhi\u1ec5m c\u1ee5 th\u1ec3.<\/p>\n\n\n\n

Ba ch\u1ec9 s\u1ed1 ch\u1ea5t l\u01b0\u1ee3ng b\u1ea5t di b\u1ea5t d\u1ecbch<\/h2>\n\n\n\n

To classify as fiber grade rPET flakes<\/strong>, the output from a washing line must typically pass strict laboratory analysis focusing on three primary failure points:<\/p>\n\n\n\n

1. The Thermal Threat: PVC Contamination (< 50 PPM)<\/strong> Polyvinyl Chloride (PVC) is the absolute enemy of polyester spinning. Because PVC and PET have similar melting points but vastly different thermal degradation profiles, any PVC present in the extruder will burn and release hydrochloric acid. This acid acts as a catalyst, aggressively degrading the PET molecular chain, turning the melt brown, and severely reducing its intrinsic viscosity (IV). Controlling PVC content in PET flakes<\/code> requires rigorous upstream intervention. It cannot be washed away; it must be physically removed through manual sorting or optical separation before the material ever enters the heavy-duty PET crusher<\/a><\/strong>.<\/p>\n\n\n\n

2. The Chemical Residue: pH Level (< 8)<\/strong> Heavy-duty cleaning requires aggressive saponification. High-capacity recycling lines utilize caustic soda (NaOH) in a hot wash PET line<\/strong> <\/a>to dissolve organic oils and stubborn adhesives. However, if this highly alkaline solution remains on the plastic, it will cause chemical hydrolysis during downstream melting. To achieve fiber grade, the pH value of the final flake must be neutralized to below 8. This is mechanically achieved through aggressive scouring inside high-speed friction washers, followed by multi-stage deep-water rinsing tanks that dilute and isolate the chemical carryover.<\/p>\n\n\n\n

3. The Physical Barrier: Moisture Content (< 1%)<\/strong> PET is a hygroscopic material, meaning it absorbs water. If the moisture content exceeds 1% (or even 0.5% for ultra-fine filaments), the water molecules will react with the PET polymer chains at extrusion temperatures (around 280\u00b0C). This thermal hydrolysis sharply drops the molecular weight, resulting in brittle fibers that break under tension.<\/p>\n\n\n\n

C\u1ea5u h\u00ecnh c\u01a1 h\u1ecdc cho ki\u1ec3m so\u00e1t \u0111\u1ed9 \u1ea9m<\/h3>\n\n\n\n

Vi\u1ec7c \u0111\u01b0a \u0111\u1ed9 \u1ea9m xu\u1ed1ng t\u1eeb qu\u00e1 tr\u00ecnh r\u1eeda ho\u00e0n to\u00e0n ng\u00e2m xu\u1ed1ng d\u01b0\u1edbi 1% \u0111\u00f2i h\u1ecfi c\u01a1 s\u1edf s\u1ea5y chuy\u00ean d\u1ee5ng. Ph\u01a1i t\u1ef1 nhi\u00ean \u1edf m\u00f4i tr\u01b0\u1eddng l\u00e0 kh\u00f4ng th\u1ec3 trong m\u00f4i tr\u01b0\u1eddng c\u00f4ng nghi\u1ec7p.<\/p>\n\n\n\n

Based on Shuliy Group\u2019s engineering configurations, the initial stage utilizes a centrifugal dryer<\/strong> (operating with a 37kw motor for 3000kg\/h capacities). The intense G-force generated by the rotor strips away up to 98% of the surface water. However, to guarantee the strict parameter required for fiber grade rPET flakes<\/strong>, the material must then be transported through a thermal drying pipeline. Injecting hot air (typically through a 15-to-20-meter pipe system) evaporates the remaining microscopic moisture trapped within the flake crevices.<\/p>\n\n\n\n

Ultimately, producing fiber-grade material is not about having M\u00e1y gi\u1eb7t<\/a> that clean plastic. It is about operating a synchronized chemical and mechanical system designed to strictly control PVC parts-per-million, neutralize pH, and eradicate moisture.<\/p>","protected":false},"excerpt":{"rendered":"

C\u00e1c m\u1ea3nh rPET c\u1ea5p s\u1ee3i \u0111\u00f2i h\u1ecfi ki\u1ec3m so\u00e1t nghi\u00eam ng\u1eb7t \u00f4 nhi\u1ec5m PVC, m\u1ee9c pH v\u00e0 \u0111\u1ed9 \u1ea9m \u0111\u1ec3 \u0111\u00e1p \u1ee9ng y\u00eau c\u1ea7u k\u00e9o s\u1ee3i polyester. B\u00e0i vi\u1ebft n\u00e0y gi\u1ea3i th\u00edch t\u1ea1i sao c\u00e1c th\u00f4ng s\u1ed1 n\u00e0y quan tr\u1ecdng, c\u00e1ch ch\u1ea5t \u00f4 nhi\u1ec5m l\u00e0m h\u1ecfng PET trong qu\u00e1 tr\u00ecnh \u00e9p \u0111\u00f9n, v\u00e0 c\u00e1ch c\u00e1c h\u1ec7 th\u1ed1ng washing, rinsing, centrifugal drying v\u00e0 thermal drying ti\u00ean ti\u1ebfn gi\u00fap s\u1ea3n xu\u1ea5t PET t\u00e1i ch\u1ebf ch\u1ea5t l\u01b0\u1ee3ng cao cho s\u1ea3n xu\u1ea5t PSF v\u00e0 s\u1ee3i d\u1ec7t li\u00ean t\u1ee5c.<\/p>","protected":false},"author":1,"featured_media":8836,"parent":0,"template":"","tags":[],"info-type":[3],"class_list":["post-8835","info","type-info","status-publish","has-post-thumbnail","hentry","info-type-knowledge-base"],"taxonomy_info":{"info-type":[{"value":3,"label":"Knowledge Base"}]},"featured_image_src_large":["https:\/\/www.recycle-plant.com\/wp-content\/uploads\/2026\/04\/Fiber-Grade-rPET-Flakes_\u7ed3\u679c.webp",720,540,false],"author_info":{"display_name":"Ella","author_link":"https:\/\/www.recycle-plant.com\/vi\/author\/admin\/"},"comment_info":"","_links":{"self":[{"href":"https:\/\/www.recycle-plant.com\/vi\/wp-json\/wp\/v2\/info\/8835","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.recycle-plant.com\/vi\/wp-json\/wp\/v2\/info"}],"about":[{"href":"https:\/\/www.recycle-plant.com\/vi\/wp-json\/wp\/v2\/types\/info"}],"author":[{"embeddable":true,"href":"https:\/\/www.recycle-plant.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.recycle-plant.com\/vi\/wp-json\/wp\/v2\/media\/8836"}],"wp:attachment":[{"href":"https:\/\/www.recycle-plant.com\/vi\/wp-json\/wp\/v2\/media?parent=8835"}],"wp:term":[{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.recycle-plant.com\/vi\/wp-json\/wp\/v2\/tags?post=8835"},{"taxonomy":"info-type","embeddable":true,"href":"https:\/\/www.recycle-plant.com\/vi\/wp-json\/wp\/v2\/info-type?post=8835"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}