{"id":1417,"date":"2026-08-22T16:55:02","date_gmt":"2026-08-22T08:55:02","guid":{"rendered":"https:\/\/extruder-lab.com\/?p=1417"},"modified":"2026-08-26T18:09:19","modified_gmt":"2026-08-26T10:09:19","slug":"hartek-conical-twin-screw-extruder","status":"publish","type":"post","link":"https:\/\/extruder-lab.com\/es\/hartek-conical-twin-screw-extruder.html","title":{"rendered":"Gu\u00eda t\u00e9cnica de la extrusora c\u00f3nica de doble tornillo Hartek"},"content":{"rendered":"

For researchers and compounders working with high-viscosity materials\u2014rubbers, engineering resins, and bio-based polymers\u2014the difference between a successful formulation and a failed experiment often comes down to three critical parameters: temperature profile<\/strong>, screw speed<\/strong>, and draw ratio<\/strong>. These are not merely settings to be dialed in arbitrarily; they are interdependent variables that determine melt quality, dispersion efficiency, and final product properties.<\/p>\n\n\n\n

The HTPS conical counter-rotating extrusora de doble husillo<\/strong> from Hartek Technology provides the precision and flexibility needed to master these three pillars of extrusion. Below is a technical guide to understanding and optimizing each parameter for your specific materials.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n
\n\n\n\n

1. Temperature Profile: The Thermal Foundation of Melt Quality<\/h3>\n\n\n\n

Why Temperature Profile Matters:<\/strong><\/p>\n\n\n\n

Different polymers require distinct thermal histories. Setting the correct temperature profile ensures:<\/p>\n\n\n\n

    \n
  • Complete melting without thermal degradation<\/li>\n\n\n\n
  • Optimal melt viscosity for consistent flow<\/li>\n\n\n\n
  • Proper additive dispersion<\/li>\n\n\n\n
  • Reduced pressure fluctuations at the die<\/li>\n<\/ul>\n\n\n\n
    \n\n\n\n

    2. Screw Speed: Balancing Shear, Throughput, and Residence Time<\/h3>\n\n\n\n

    The HTPS-40 is equipped with a 1.3 kW servo motor<\/strong> with a rated speed of 1500 RPM<\/strong> and a maximum screw speed of 500 RPM<\/strong>. The servo drive offers precise speed control, allowing researchers to dial in the exact shear input required for each formulation.<\/p>\n\n\n\n

    Why Screw Speed Matters:<\/strong><\/p>\n\n\n\n

    Screw speed directly influences:<\/p>\n\n\n\n

      \n
    • Shear rate<\/strong>: Higher speeds generate more mechanical energy, improving dispersive mixing but also increasing melt temperature<\/li>\n\n\n\n
    • Throughput<\/strong>: Speed determines output rate<\/li>\n\n\n\n
    • Residence time<\/strong>: Faster speeds reduce the time material spends in the barrel, which is critical for heat-sensitive polymers<\/li>\n\n\n\n
    • Filling ratio<\/strong>: Higher speeds help reduce the filling ratio of screw channels, which positively affects torque requirements<\/li>\n<\/ul>\n\n\n\n

      Speed Selection Guidelines:<\/strong><\/p>\n\n\n\n

        \n
      • Heat-sensitive materials (PLA, TPU, PVC)<\/strong>: Operate at lower speeds (50\u2013150 RPM)<\/strong> to minimize frictional heating and shorten residence time<\/li>\n\n\n\n
      • High-viscosity rubber or heavily filled compounds<\/strong>: Higher speeds (300\u2013500 RPM)<\/strong> boost shear for better dispersion<\/li>\n\n\n\n
      • General rule<\/strong>: Start at approximately 100 RPM and increase incrementally while observing melt temperature and motor current<\/li>\n<\/ul>\n\n\n\n
        \n\n\n\n

        3. Draw Ratio: The Bridge Between Extrudate and Final Product<\/h3>\n\n\n\n

        The draw ratio\u2014the relationship between the cross-sectional area of the extrudate exiting the die and the final product\u2014is often overlooked but critically important for achieving desired mechanical and dimensional properties.<\/p>\n\n\n\n

          \n
        • Why Draw Ratio Matters:<\/li>\n\n\n\n
        • Draw ratio influences:<\/li>\n\n\n\n
        • Molecular orientation: Higher draw ratios align polymer chains, improving tensile strength<\/li>\n\n\n\n
        • Final dimensions: Determines the cross-sectional area of the finished product<\/li>\n\n\n\n
        • Surface quality: Affects smoothness and defect formation<\/li>\n\n\n\n
        • Mechanical properties: Impacts modulus, elongation, and toughness<\/li>\n<\/ul>\n\n\n\n

          Key Considerations for Draw Ratio Optimization:<\/h2>\n\n\n\n
            \n
          • Material type: Amorphous polymers (PS, PC) can tolerate higher draw ratios than semi-crystalline polymers (PE, PP) which may undergo strain-induced crystallization<\/li>\n\n\n\n
          • Melt strength: Materials with higher melt strength (e.g., rubbers, elastomers) can withstand greater draw ratios without breaking<\/li>\n\n\n\n
          • Cooling conditions: The rate and uniformity of cooling after extrusion significantly affect how well the drawn dimensions are maintained<\/li>\n\n\n\n
          • Die design: The relationship between die exit area and take-up speed determines the actual draw ratio achieved<\/li>\n<\/ul>\n\n\n\n

            Practical Approach:<\/h2>\n\n\n\n

            When developing new formulations on the HTPS-40, systematically vary the take-up speed while keeping extrusion parameters constant. Observe the relationship between draw ratio and:<\/p>\n\n\n\n

              \n
            • Filament\/film diameter uniformity<\/li>\n\n\n\n
            • Surface defects (melt fracture, sharkskin)<\/li>\n\n\n\n
            • Mechanical properties of collected samples<\/li>\n<\/ul>\n\n\n\n

              Start-Up Procedure for Optimal Parameter Development<\/h2>\n\n\n\n
                \n
              • Set temperature profile based on your material’s thermal properties (refer to the inverted-V guideline)<\/li>\n\n\n\n
              • Allow 30-minute heat soak for thermal equilibrium<\/li>\n\n\n\n
              • Start screw at low speed (5\u201320 RPM) and gradually increase to target<\/li>\n\n\n\n
              • Begin feeding slowly while monitoring the main motor current<\/li>\n\n\n\n
              • Adjust cooling as needed to maintain stable melt temperature<\/li>\n\n\n\n
              • Collect samples at various draw ratios to identify optimal conditions<\/li>\n\n\n\n
              • Document all parameters\u2014the HTPS-40’s touchscreen HMI allows easy storage and recall of successful recipes<\/li>\n<\/ul>\n\n\n\n

                From Lab to Production: Scale-Up Confidence<\/h2>\n\n\n\n

                The conical screw geometry of the HTPS-40 closely mirrors that of industrial-scale conical twin-screw extruders. This means the temperature profiles, screw speeds, and draw ratios you optimize on this 40 mL unit can be transferred directly to production lines as startup parameters\u2014not approximations, but directly applicable data.<\/p>\n\n\n\n

                \"\"<\/figure>\n\n\n\n

                Specification of Conical Twin-Screw Extruder<\/h2>\n\n\n\n
                No.<\/th>Par\u00e1metro<\/th>Conical Twin-Screw Extruder Specification \/ HTPS-5<\/th><\/tr><\/thead>
                1<\/td>Capacidad<\/td>40 mL<\/td><\/tr>
                2<\/td>Servo Motor Power<\/td>1.3 kW, rated speed 1500 RPM<\/td><\/tr>
                3<\/td>Max Screw Speed<\/td>500 RPM<\/td><\/tr>
                4<\/td>Di\u00e1metro del tornillo<\/td>Conical \u03a65.4 \/ \u03a625 mm, length 240 mm<\/td><\/tr>
                5<\/td>Screw Structure<\/td>One\u2011piece integral screw design<\/td><\/tr>
                6<\/td>Screw Material<\/td>38CrMoALA (nitrided steel)<\/td><\/tr>
                7<\/td>Sentido de giro<\/td>Counter\u2011rotating \/ Co\u2011rotating (switchable)<\/td><\/tr>
                8<\/td>Barril<\/td>Split\u2011type (clamshell) barrel structure, material 440C stainless steel<\/td><\/tr>
                9<\/td>Heating Zones<\/td>6 zones, 200 W per zone<\/td><\/tr>
                10<\/td>Max Operating Temperature<\/td>350 \u00b0C<\/td><\/tr>
                11<\/td>Cooling System<\/td>Combined air and water cooling<\/td><\/tr>
                12<\/td>Mixing Modes<\/td>Dual\u2011mode design with diverter valve \u2013 freely switchable between circulation mixing and extrusion modes<\/td><\/tr>
                13<\/td>Control Interface<\/td>Touchscreen HMI control<\/td><\/tr>
                14<\/td>Overall Dimensions (L\u00d7W\u00d7H)<\/td>550 \u00d7 650 \u00d7 1000 mm<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

                <\/p>","protected":false},"excerpt":{"rendered":"

                For researchers and compounders working with high-viscosity materials\u2014rubbers, engineering resins, and bio-based polymers\u2014the difference between a successful formulation and a failed experiment often comes down to three critical parameters: temperature profile, screw speed, and draw ratio. These are not merely settings to be dialed in arbitrarily; they are interdependent variables that determine melt quality, dispersion […]<\/p>\n","protected":false},"author":1,"featured_media":1418,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"disabled","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[11],"tags":[41],"class_list":["post-1417","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-product-introduction","tag-conical-twin-screw-extruder"],"_links":{"self":[{"href":"https:\/\/extruder-lab.com\/es\/wp-json\/wp\/v2\/posts\/1417","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/extruder-lab.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/extruder-lab.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/extruder-lab.com\/es\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/extruder-lab.com\/es\/wp-json\/wp\/v2\/comments?post=1417"}],"version-history":[{"count":3,"href":"https:\/\/extruder-lab.com\/es\/wp-json\/wp\/v2\/posts\/1417\/revisions"}],"predecessor-version":[{"id":1422,"href":"https:\/\/extruder-lab.com\/es\/wp-json\/wp\/v2\/posts\/1417\/revisions\/1422"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/extruder-lab.com\/es\/wp-json\/wp\/v2\/media\/1418"}],"wp:attachment":[{"href":"https:\/\/extruder-lab.com\/es\/wp-json\/wp\/v2\/media?parent=1417"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/extruder-lab.com\/es\/wp-json\/wp\/v2\/categories?post=1417"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/extruder-lab.com\/es\/wp-json\/wp\/v2\/tags?post=1417"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}