Granulation line with extruder is an automated production system that processes plastics, rubber, chemical raw materials and other materials into granular products through melting, extrusion, cutting and other processes. This line is widely used in industries such as plastic processing, chemical industry, food industry and pharmaceutical industry. Below is a detailed description of its main components and workflow.

I. Main components of the production line

II. Typical working process of a granulation line

III. Key selection factors

IV. Common problems and solutions

V. Applications

VII. Pelletizing line services include

I. Main components of the production line

1. System for feeding raw materials into the granulation line

   • Hopper/automatic loader: Feeds raw materials (such as powder, granules or recycled material) into the extruder, can be equipped with drying or preheating function.

   • Dosing device: Ensures precise mixing of raw materials with additives (such as dyes, stabilizers).

2. Granulation extruder(main equipment)

   • Single screw/twin screw extruder:

     • Single screw: Suitable for common plastics (such as PE, PP), simple structure, low cost.

     • Twin screw: Suitable for high-fill and heat-sensitive materials (eg PVC, biodegradable plastics), ensures better mixing.

   • Heating and temperature control system: Zone heating (cylinder, die), precise control of melting temperature.

   • Replaceable filter element: Removes impurities in the melt, increasing product purity.

3. Die and pellet cutting system

   • Die design: The shape of the holes is selected depending on the required shape of the granules (cylindrical, hemispherical, etc.).

   • Cutting methods:

     • Hot cutting (underwater): The melt is cut immediately after leaving the die, suitable for viscous materials, provides a smooth surface of the granules.

     • Cold cutting (cutting harnesses): The melt is cooled to a solid state, then cut, suitable for hard plastics (eg ABS).

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4. Cooling and drying system in the granulation line

   • Water bath/air cooling: Quickly cools granules to prevent sticking.

   • Centrifuge/vibrating sieve: Removes surface moisture, keeping granules dry.

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5. Finishing equipment

   • Vibrating sieve: Separates quality granules from crumbs.

   • Packaging system: Automatic weighing and packaging (vacuum packaging possible).

6. Granulation line control system

   • Control via PLC or touch panel, integrated monitoring of temperature, rotation speed and pressure for production automation.

II. Typical working process of a granulation line

1. Pre-processing of raw materials: Mixing the base material with additives, drying if necessary (for example, PET requires drying).

2. Melting and extrusion: The raw materials are heated, compressed and homogenized in the extruder, then passed through a die in the form of tows or melts.

3. Granule cutting: Hot or cold cutting to form granules.

4. Cooling and drying: Water or air cooling followed by dehydration.

5. Sorting and packaging: Removal of substandard granules, packaging of finished products.

III. Key selection factors

1. Characteristics of raw materials:

   • Heat sensitive materials (eg PVC) require a twin screw extruder with low temperature extrusion.

   • Highly viscous materials (eg TPU) may require an additional melt pump.

2. Productivity:

   • Small lines (100–500 kg/h) are suitable for laboratories or small-scale production.

   • Large lines (1–5 t/h) are used on an industrial scale.

3. Granule size:

   • The standard diameter is 1–5 mm, special shapes require an individual die.

4. Energy consumption and environmental friendliness:

   • Energy-efficient extruders (such as those with electromagnetic heating) reduce energy costs.

   • Emission control equipment (eg, activated carbon adsorption) reduces VOC emissions.

IV. Common problems and solutions

• Clumping of granules: Insufficient cooling or high blade temperature - water temperature or cutting speed needs to be adjusted.

• Uneven size: Clogged die or unstable flow - check the filter mesh and dispenser.

• Color change/degradation: Overheating or prolonged stay in the extruder - optimization of process parameters.

V. Applications

• Plastic recycling: Granulation of waste for recycling.

• Biodegradable materials: Production of granules from PLA/PBAT and other eco-plastics.

• Special plastics: For example, electrically conductive or fire-resistant composites.

VI. Development trends

• Intellectualization: IoT integration for real-time monitoring of equipment quality and condition.

• Greening: Energy-saving technologies and waste recycling systems.

• Multifunctionality: Universal lines for working with various materials.

  Service of extruders of our company

  We offer comprehensive after-sales services to ensure trouble-free operation of your equipment.

• VII. Granulation line services include:

  1. Technical support 24/7

     • Hotline for emergency consultations

     • Remote diagnostics via IoT platform

     • Quick Troubleshooting Tips

  2. Warranty service

     • 12-36 months hardware warranty

     • Free repair or replacement of defective components

     • Priority service for warranty cases

  3. Scheduled maintenance

     • Annual service contracts

     • Routine work at the customer's site

     • Checking all critical nodes:
       • Screw pairs
       • Heating elements
       • Hydraulic systems

  4. Repair services

     • Restoration of worn parts

     • Modernization of obsolete components

     • Urgent service team visits (up to 72 hours)

  5. Original spare parts

     • Lifetime parts availability for all models

     • Express delivery system (3-7 days)

  6. Staff training

     • Free trainings on:
       • Safe operation
       • Basic maintenance
       • Optimization of extrusion parameters

  Additional services:

  • Production efficiency analysis

  • Recommendations for line modernization

  • Equipment leasing with service package

  To submit a service request, provide:

  1. Equipment serial number

  2. Description of the problem/requirements

  3. Desired deadlines for completing the work

  Our advantages:
  ✓ 15 years of experience in servicing extrusion equipment
  ✓ Average response time – 4 hours
  ✓ 98% of clients recommend our service

  We are ready to discuss individual service conditions for your enterprise!

• Extrusion lines for the production of granulators – Qingdao Xinrui Plastic Machinery Co.,Ltd. – machines for sheets of WPC decking boards