{"id":1602,"date":"2026-08-26T14:22:37","date_gmt":"2026-08-26T06:22:37","guid":{"rendered":"https:\/\/bastone-petrochem.com\/?p=1602"},"modified":"2026-08-26T14:22:37","modified_gmt":"2026-08-26T06:22:37","slug":"polypropylene-raffia-grade-woven-sack-line","status":"publish","type":"post","link":"https:\/\/bastone-petrochem.com\/es\/polypropylene-raffia-grade-woven-sack-line\/","title":{"rendered":"\u00bfQu\u00e9 grado de polipropileno rafia se adapta a una l\u00ednea de sacos tejidos?"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Una l\u00ednea de cintas de sacos tejidos opera con un homopol\u00edmero de polipropileno con un \u00edndice de fluidez cercano a 3 g\/10 min (230 \u00b0C \/ 2.16 kg) y un \u00edndice de isotacticidad superior a 95%. Esa sola frase reduce miles de grados comerciales de PP a un pu\u00f1ado.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">El n\u00famero de \u00edndice de fluidez es la parte f\u00e1cil. Cada certificado lo imprime. La pregunta m\u00e1s dif\u00edcil es lo que el certificado no imprime, y por qu\u00e9 dos grados con el mismo \u00edndice de fluidez pueden comportarse de manera diferente en el bastidor de estirado.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Qu\u00e9 Califica a un Homopol\u00edmero como Grado Raffia<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/bastone-petrochem.com\/es\/decide-between-three-main-grades-polypropylene-resin\/\">Homopol\u00edmero, no un copol\u00edmero aleatorio o de impacto<\/a>, es la familia de resina porque la cinta necesita cristalinidad para la resistencia al estirado. Las unidades de etileno del copol\u00edmero diluyen esa cristalinidad, por lo que los grados de copol\u00edmero pertenecen a tuber\u00edas o pel\u00edculas de envasado, no a una l\u00ednea de cintas.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">El \u00edndice de fluidez es el guardi\u00e1n. Las p\u00e1ginas de los comerciantes publican un rango de 2 a 5 g\/10 min, pero los certificados reales se agrupan m\u00e1s estrechamente:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Grado<\/th><th>Grupo productor<\/th><th>Especificaci\u00f3n de \u00edndice de fluidez<\/th><th>M\u00e9todo<\/th><\/tr><\/thead><tbody><tr><td>S1003<\/td><td>CHN Energy \/ China Shenhua<\/td><td>0 +\/- 0.5 g\/10 min<\/td><td>impreso en TDS<\/td><\/tr><tr><td>L5E89<\/td><td>Datang Inner Mongolia Duolun<\/td><td>5 +\/- 0.5 (lote 3.4)<\/td><td>GB\/T 3682.1-2008<\/td><\/tr><tr><td>T30S<\/td><td>Sinopec<\/td><td>5 a 3.7<\/td><td>GB\/T 36820<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Los certificados recuperados se centran en 3.0 a 3.5 g\/10 min. Un grado que indica 5 g\/10 min sigue dentro del rango publicado, pero ning\u00fan certificado recuperado llega tan alto.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">El \u00edndice de isotacticidad es la segunda fila. Las especificaciones van desde 95.0% (L5E89) hasta 97.6% o m\u00e1s (T30S), todas probadas seg\u00fan GB\/T 2412.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Una mayor isotacticidad aumenta la cristalinidad y la resistencia al estirado, pero tambi\u00e9n endurece el fundido. La cifra correcta depende de d\u00f3nde opera la l\u00ednea dentro del rango de relaci\u00f3n de estirado.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">El contenido de cenizas es la tercera fila, medido seg\u00fan GB\/T 9345.1. Las especificaciones van desde 115 mg\/kg hasta 500 mg\/kg en los grados de este conjunto.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Mayor ceniza significa m\u00e1s residuo de catalizador, que aparece como \u201cpart\u00edculas retenidas en la pel\u00edcula\u201d en la tabla de fallas de una planta de cintas. Ese residuo alimenta roturas o defectos de gel en la cuchilla.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Por Qu\u00e9 Dos Grados con el Mismo \u00cdndice de Fluidez se Estiran de Manera Diferente<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">La distribuci\u00f3n de pesos moleculares (MWD) es lo que separa dos grados con el mismo \u00edndice de fluidez, y no aparece en ninguno de los certificados anteriores. La propia patente de un productor de resina (US11845816B2, TotalEnergies, 2023) establece que sus polipropilenos difieren en MWD, solubles en xileno y peso molecular \u201ca MFI similar\u201d. La patente especifica la ventana de MWD como Mw\/Mn entre 2.0 y 2.9.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">El MFI solo no le dice si un grado se estirar\u00e1 limpiamente. Tambi\u00e9n necesita datos de distribuci\u00f3n de pesos moleculares.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">C\u00f3mo Responde la Tenacidad a la Relaci\u00f3n de Estirado<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">La tenacidad alcanza su punto m\u00e1ximo cerca de una relaci\u00f3n de estirado de 7:1. Los ejemplos de patentes (EP2084316A1, Fina Technology, 2009) reportan 8.1 g\/denier a 7:1, 7.9 a 8:1 y 7.8 a 9:1, frente a una base comercial declarada de 4 a 6 g\/denier.<\/p>\n\n\n\n<div data-chart-block=\"hbar\" class=\"nm-chart\" role=\"figure\" aria-label=\"La tenacidad alcanza su punto m\u00e1ximo a 7:1 y luego cae \u2014 Tenacidad de cinta estirada por relaci\u00f3n de estirado, g\/denier (ejemplos de patentes)\"><style>.nm-chart { margin:2rem 0; padding:1.25rem 1.4rem; background:var(--nm-paper,#f7f8fa); border:1px solid var(--nm-line,#dfe4ea); border-radius:12px; color:var(--nm-ink,#1c2e4a); font-family:inherit; } .nm-chart .nm-title { font-size:1.05rem; font-weight:700; line-height:1.3; margin:0 0 .25rem; } .nm-chart .nm-subtitle { font-size:.9rem; line-height:1.45; margin:0 0 1.1rem; color:var(--nm-muted,#6b7a8c); } .nm-chart .nm-rows { display:flex; flex-direction:column; gap:.85rem; } .nm-chart .nm-row { display:grid; grid-template-columns:minmax(80px,22%) 1fr max-content; align-items:center; gap:.75rem; } .nm-chart .nm-rowlabel { font-size:.9rem; line-height:1.3; overflow-wrap:anywhere; color:var(--nm-label,#3c4a60); } .nm-chart .nm-track { position:relative; height:1.5rem; border-radius:4px; background:var(--nm-track,#e3e7ed); } .nm-chart .nm-bar { position:absolute; top:0; height:100%; border-radius:4px; background:var(--nm-bar,#2b4d76); } .nm-chart .nm-value { font-size:.9rem; font-weight:700; text-align:right; white-space:nowrap; color:var(--nm-accent,#c8611a); } .nm-chart .nm-stacktrack { display:flex; height:2rem; border-radius:5px; overflow:hidden; } .nm-chart .nm-seg { height:100%; } .nm-chart .nm-legend { display:flex; flex-wrap:wrap; gap:.55rem 1.5rem; margin-top:1rem; } .nm-chart .nm-legrow { display:flex; align-items:center; gap:.5rem; font-size:.9rem; } .nm-chart .nm-swatch { width:.8rem; height:.8rem; border-radius:2px; flex:none; } .nm-chart .nm-legval { font-weight:700; color:var(--nm-accent,#c8611a); } .nm-chart .nm-leglabel { color:var(--nm-label,#3c4a60); } .nm-chart .nm-source { font-size:.78rem; letter-spacing:.02em; margin-top:1.1rem; color:var(--nm-muted,#6b7a8c); } .nm-chart .nm-axis { display:flex; justify-content:space-between; margin:.5rem 3.4rem 0 calc(22% + .75rem + 3.4rem); font-size:.72rem; color:var(--nm-muted,#6b7a8c); } .nm-chart .nm-tick { flex:0 0 auto; } .nm-chart .nm-axis-log { position:relative; display:block; height:1rem; } .nm-chart .nm-tick-abs { position:absolute; transform:translateX(-50%); white-space:nowrap; } .nm-chart .nm-dbrow { display:grid; grid-template-columns:minmax(80px,22%) 1fr; align-items:center; gap:.75rem; } \/* The row's extreme values sit AT 0% and 100% of the track, and their labels hang outside those points \u2014 so the track cannot span the full row or the widest label overflows the card (shipped 2026-08-02: \"200 %\" clipped off the right edge). Reserve a gutter on both sides instead of shrinking the data. *\/ .nm-chart .nm-dbtrack { position:relative; height:2.1rem; margin:0 3.4rem; } .nm-chart .nm-dbline { position:absolute; top:50%; height:3px; margin-top:-1.5px; border-radius:2px; background:var(--nm-track,#e3e7ed); } .nm-chart .nm-dot { position:absolute; top:50%; width:.72rem; height:.72rem; margin:-.36rem 0 0 -.36rem; border-radius:50%; } .nm-chart .nm-dot-a { background:var(--nm-bar-a,#6f89a8); } .nm-chart .nm-dot-b { background:var(--nm-accent,#c8611a); } .nm-chart .nm-dbval { position:absolute; top:50%; font-size:.78rem; font-weight:700; white-space:nowrap; transform:translateY(-50%); } .nm-chart .nm-dbval-a { color:var(--nm-label,#3c4a60); } .nm-chart .nm-dbval-b { color:var(--nm-accent,#c8611a); } .nm-chart .nm-dbval-left { margin-left:-.75rem; transform:translate(-100%,-50%); } .nm-chart .nm-dbval-right { margin-left:.75rem; } .nm-chart .nm-sw-a { background:var(--nm-bar-a,#6f89a8); } .nm-chart .nm-sw-b { background:var(--nm-accent,#c8611a); } .nm-chart .nm-donutwrap { display:flex; flex-wrap:wrap; align-items:center; gap:1.5rem 2rem; } .nm-chart .nm-donut { position:relative; flex:0 0 auto; width:min(11rem,42vw); } .nm-chart .nm-donut svg { display:block; width:100%; height:auto; transform:rotate(0deg); } .nm-chart .nm-center { position:absolute; inset:0; display:flex; flex-direction:column; align-items:center; justify-content:center; text-align:center; pointer-events:none; } .nm-chart .nm-centerval { font-size:1.7rem; font-weight:800; line-height:1; color:var(--nm-ink,#1c2e4a); } .nm-chart .nm-centerlab { font-size:.75rem; margin-top:.25rem; color:var(--nm-muted,#6b7a8c); } .nm-chart .nm-donutside { flex:1 1 13rem; min-width:12rem; display:flex; flex-direction:column; gap:.55rem; } .nm-chart .nm-legdesc { color:var(--nm-muted,#6b7a8c); } .nm-chart .nm-note { margin-top:.5rem; font-size:.88rem; line-height:1.5; color:var(--nm-label,#3c4a60); } @media (max-width:640px) { .nm-chart .nm-row { grid-template-columns:1fr max-content; grid-template-areas:\"lab val\" \"track track\"; row-gap:.35rem; } .nm-chart .nm-rowlabel { grid-area:lab; } .nm-chart .nm-value { grid-area:val; } .nm-chart .nm-track { grid-area:track; } .nm-chart .nm-dbrow { grid-template-columns:1fr; row-gap:.1rem; } .nm-chart .nm-dbtrack { margin:0 2.8rem; } .nm-chart .nm-axis { margin:.5rem 2.8rem 0 2.8rem; } .nm-chart .nm-donut { width:min(9rem,46vw); margin:0 auto; } }<\/style><div class=\"nm-subtitle\">Tenacidad de cinta estirada por relaci\u00f3n de estirado, g\/denier (ejemplos de patentes)<\/div><div class=\"nm-rows\"><div class=\"nm-row\"><div class=\"nm-rowlabel\">Relaci\u00f3n de estirado 7:1<\/div><div class=\"nm-track\"><div class=\"nm-bar\" style=\"left:0.00%;width:100.00%\"><\/div><\/div><div class=\"nm-value\">1 g\/denier<\/div><\/div><div class=\"nm-row\"><div class=\"nm-rowlabel\">Relaci\u00f3n de estirado 8:1<\/div><div class=\"nm-track\"><div class=\"nm-bar\" style=\"left:0.00%;width:97.53%\"><\/div><\/div><div class=\"nm-value\">9 g\/denier<\/div><\/div><div class=\"nm-row\"><div class=\"nm-rowlabel\">Relaci\u00f3n de estirado 9:1<\/div><div class=\"nm-track\"><div class=\"nm-bar\" style=\"left:0.00%;width:96.30%\"><\/div><\/div><div class=\"nm-value\">8 g\/denier<\/div><\/div><div class=\"nm-row\"><div class=\"nm-rowlabel\">Base comercial<\/div><div class=\"nm-track\"><div class=\"nm-bar\" style=\"left:49.38%;width:24.69%\"><\/div><\/div><div class=\"nm-value\">4\u20136 g\/denier<\/div><\/div><\/div><div class=\"nm-axis\"><span class=\"nm-tick\">0 g\/denier<\/span><span class=\"nm-tick\">025 g\/denier<\/span><span class=\"nm-tick\">05 g\/denier<\/span><span class=\"nm-tick\">075 g\/denier<\/span><span class=\"nm-tick\">1 g\/denier<\/span><\/div><\/div><!-- \/chart -->\n\n\n\n<p class=\"wp-block-paragraph\">M\u00e1s estirado no es mon\u00f3tonamente m\u00e1s resistencia. Una segunda patente (US11845816B2) reclama al menos 45 cN\/tex (aproximadamente 5.1 g\/denier) a relaciones de estirado de 2 a 12, y al menos 50 cN\/tex a 5 a 7. Estas son cifras de ejemplos de patentes, no datos de l\u00ednea de producci\u00f3n.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La direcci\u00f3n de MWD que la l\u00ednea necesita depende de lo que optimiza. Las patentes de alta tenacidad usan composiciones metaloc\u00e9nicas y especiales con MWD estrecha.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La gu\u00eda de raffia del lado del productor lista \u201cdistribuci\u00f3n de pesos moleculares moderadamente amplia\u201d como una caracter\u00edstica deseable para grados Ziegler-Natta. La amplitud intercambia algo de tenacidad por resistencia del fundido y operaci\u00f3n estable del dado.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Cuando la Cinta se Divide<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">En la tabla de fallas de la planta de cintas, \u201cpel\u00edcula muy r\u00edgida\u201d y \u201cpel\u00edcula demasiado blanda\u201d son los dos controles del lado de la resina para roturas de cinta y baja tenacidad. Ambos se mapean de vuelta a d\u00f3nde se sit\u00faa el grado dentro de la ventana de MWD e \u00edndice de fluidez.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La variaci\u00f3n de denier no tiene ninguna causa listada del lado de la resina. Atribuya la divisi\u00f3n a la resina solo despu\u00e9s de verificar el perfil del horno de orientaci\u00f3n, la relaci\u00f3n de velocidad de los rodillos y la relaci\u00f3n de estiramiento.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Una l\u00ednea de cintas que intenta operar con un <a href=\"https:\/\/bastone-petrochem.com\/es\/pp-grade-ppr-pipe-line\/\">grado de tuber\u00eda PP-R<\/a> no extruir\u00eda una pel\u00edcula fundible. El eje de especificaci\u00f3n para tuber\u00edas es la clase de presi\u00f3n hidrost\u00e1tica, no la tenacidad de la cinta.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">C\u00f3mo verificar un grado de polipropileno rafia cotizado antes de realizar un pedido<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Un c\u00f3digo de grado en una cotizaci\u00f3n es un espacio de nombres del productor, no una garant\u00eda de propiedades. La hoja de datos t\u00e9cnicos publicada de S1003 est\u00e1 encabezada por CHN Energy \/ China Shenhua y cita la tecnolog\u00eda de fase gaseosa de reactor horizontal-kettle de INEOS.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La misma hoja lleva una designaci\u00f3n estandarizada, PP-H,T,130-45-030, cuyo 030 final rastrea el \u00edndice de fluidez de 3.0 g\/10 min. <a href=\"https:\/\/bastone-petrochem.com\/es\/product\/pp-s1003\/\">PP S1003 en el canal PetroChina KUNLUN<\/a> es el mismo c\u00f3digo de grado de un productor diferente. Un c\u00f3digo comercial, al menos dos productores.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">C\u00f3digo de grado vs. Reclamaci\u00f3n de propiedades<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">T30S es otro ejemplo: Sinopec lo vende como grado rafia, y los listados de mercado de otras regiones lo describen de la misma manera. El c\u00f3digo te indica la ranura del cat\u00e1logo del productor. El certificado te indica el lote.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La pregunta de \u201cpor qu\u00e9 no este\u201d se responde sola con un n\u00famero. <a href=\"https:\/\/bastone-petrochem.com\/es\/product-category\/synthetic-resin\/pp\/\">PP<\/a> El grado S2025, tambi\u00e9n de la marca PetroChina KUNLUN, cotiza un \u00edndice de fluidez de 22.4 g\/10 min con un \u00edndice isot\u00e1ctico casi id\u00e9ntico de 97.7%.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La isotacticidad por s\u00ed sola no hace un grado rafia. S2025 es un grado de hilo BCF para alfombras, dise\u00f1ado para extrusi\u00f3n por hilera a alto rendimiento.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Lo que confirma el certificado y lo que omite<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Los certificados chinos llevan el \u00edndice isot\u00e1ctico seg\u00fan GB\/T 2412, no solubles en xileno. Los solubles en xileno (0.5 a 0.8 wt%) y el contenido de pentada mmmm aparecen en hojas de datos y patentes occidentales. Estos son tres m\u00e9tricas para la misma propiedad subyacente.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Antes de comparar dos cifras de isotacticidad de diferentes documentos, confirma si ambos citan la misma edici\u00f3n de GB\/T 2412. Las ediciones de 1980 y 2008 aparecen en documentaci\u00f3n real.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">El certificado no mide la distribuci\u00f3n de pesos moleculares, la relaci\u00f3n de estirado ni la tenacidad de la cinta. Un comprador que tiene dos certificados con el mismo \u00edndice de fluidez no puede saber por el papel qu\u00e9 grado estira mejor.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pide al proveedor datos de MWD, o al menos pregunta qu\u00e9 tenacidad han logrado otras l\u00edneas de cinta con el mismo lote. Al cambiar a una segunda fuente con el mismo \u00edndice de fluidez nominal, realiza una bobina de prueba a la relaci\u00f3n de estirado objetivo antes de comprometer el lote a producci\u00f3n.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Lo que Esto Significa en la Pr\u00e1ctica<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Comienza con la banda de \u00edndice de fluidez, no con el c\u00f3digo de grado. Cualquier homopol\u00edmero que cotice de 2.5 a 4.0 g\/10 min a 230 \u00b0C \/ 2.16 kg con un \u00edndice isot\u00e1ctico superior a 95% est\u00e1 en la ventana de rafia.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">El c\u00f3digo de grado te indica qu\u00e9 productor lo fabric\u00f3. El certificado te indica qu\u00e9 lote est\u00e1s comprando. Ninguno te dice c\u00f3mo estirar\u00e1 la cinta.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">El COA te da cuatro n\u00fameros; la hoja de especificaciones te da la ventana; la aplicaci\u00f3n te indica qu\u00e9 esquina de la ventana necesitas realmente. Pide al proveedor los datos de MWD antes de liberar un pedido de contenedor completo.<\/p>","protected":false},"excerpt":{"rendered":"<p>A woven sack tape line runs on a polypropylene homopolymer with a melt flow rate near 3 g\/10 min (230 \u00b0C \/ 2.16 kg) and an isotactic index above 95%. That single sentence narrows thousands of commercial PP grades to a handful. The melt-flow number is the easy part. Every certificate prints it. The harder [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1602","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"blocksy_meta":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Which Polypropylene Raffia Grade Fits a Woven Sack Line? - BASTONE<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/bastone-petrochem.com\/es\/polypropylene-raffia-grade-woven-sack-line\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Which Polypropylene Raffia Grade Fits a Woven Sack Line? - BASTONE\" \/>\n<meta property=\"og:description\" content=\"A woven sack tape line runs on a polypropylene homopolymer with a melt flow rate near 3 g\/10 min (230 \u00b0C \/ 2.16 kg) and an isotactic index above 95%. That single sentence narrows thousands of commercial PP grades to a handful. The melt-flow number is the easy part. Every certificate prints it. 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