Dry color mixer
Product Name:Drying and mixing machine (also known as: hot air drying mixer, drying and mixing machine, color mixing and drying integrated machine)
Product positioning:In plastic granulation production lineCore equipment in the material pretreatment stageIt collects"Drying removes moisture"and"Uniform mixing and dispersion"It integrates two major functions and is mainly used for...Recycle plastic scraps (washable sheets) or hygroscopic plastics.Drying is carried out, and during this processAdd color masterbatch, functional additives, stabilizers, etc. evenly.This provides for subsequent melt extrusion granulation.Dry, uniform, and precisely formulatedThe raw materials.
I. Core Functions and Working Principles
Core functions:
High-efficiency hot air drying:By introducingClean hot airIt comes into full contact with the tumbling wet material, removing moisture from its surface and interior, reducing the material's moisture content to the requirements of the granulation process (usually ≤0.5%, with higher requirements for PET, etc.).
Uniform mixing and dispersion:Three-dimensional mixing ensures that materials of different colors and compositions (such as natural colorants and masterbatches, recycled materials and new materials, main materials and additives) are uniformly mixed at the molecular level, eliminating "color difference" or "uneven performance".
Multifunctional and streamlined processes:This integrates the traditional "drying → cooling → conveying → mixing" process, which involves multiple devices and processes, into a single device and process.Saves space, reduces energy consumption, and avoids secondary pollution.。
Working principle (taking a common hot air circulation type as an example):
Wet plastic sheets are fed in from the top inlet.Insulated mixing tankAfter startup:
Mixing system:Inside the canThree-dimensional stirring impeller (usually S-shaped or blade-type)The rotation begins, causing the material to be repeatedly thrown up and diffused, creating complex convective motion.
Drying system: Electric heating or steam heaterThe generated clean hot air is produced byHigh-pressure centrifugal fanHot air is blown into the tank from the bottom or side, penetrating the tumbling layer of material. It absorbs moisture, becoming humid air, which is then exhausted from the top or through…Dust filterAfterwards, some of it can be recycled to improve energy efficiency.
Color mixing/feeding system:In the early or middle stages of the drying process, throughManual or automatic feeding portPrecisely measured masterbatches, additives, etc., are added into the tank and thoroughly mixed with the main material under the action of a stirring paddle.
Cooling and discharging (optional):After drying and mixing, the process can be switched to blowing in room temperature air for cooling to prevent the hot material from clumping. Finally, through...Bottom pneumatic or manual discharge valveThe finished material is discharged and enters the extruder feeding system.
II. Main Structural Components
Main tank body:
Material:UsuallyStainless steel (304/316)The inner wall is smooth, corrosion-resistant, and easy to clean, ensuring the purity of the materials.
structure:The double-layer insulation structure, with insulation cotton filling the interlayer, reduces heat loss.
Observation window and lighting:It facilitates observation of the internal material condition.
Stirring drive system:
Stirring shaft and impeller:Heavy-duty spindle and multi-layered specially designed blades ensure thorough mixing without dead zones.
Drive motor and reducer:usefrequency converterThe stirring speed can be infinitely adjusted to adapt to different materials and stages (such as high-speed mixing and low-speed cooling).
Hot air circulation system:
Heater:Electric heating tube/finned heater or steam heat exchanger.
High-pressure centrifugal fan:Provides stable air pressure and air volume.
Inlet air filter and exhaust dust collector:Ensure that the incoming air is clean and that the exhaust air meets environmental protection requirements.
Temperature control and electrical control system:
Intelligent temperature controller:PID control accurately displays and controls the temperature inside the tank and the outlet air temperature.
PLC control (mid-to-high-end configuration):The entire process (heating, temperature control, mixing, cooling, and discharging) can be programmed and automated.
Auxiliary systems:
Automatic feeder/vacuum feeder (optional):It connects to the front storage silo to achieve automatic feeding.
Weighing module (optional):Integrated into the tank's support legs, it enables precise control of batch weight and formula management.
III. Core Features and Advantages of the Product
Integrated drying and mixing, highly efficient and energy-saving:Heat is directly absorbed by the material, resulting in high thermal efficiency; the merging of processes significantly shortens the production cycle and reduces overall energy consumption.
Excellent blending effect:Three-dimensional stirring ensures high mixing uniformity, reaching over 99%, fundamentally solving the problems of color difference and uneven performance.
High degree of automation:It can achieve automatic control of temperature, time, and speed, reducing reliance on human labor and ensuring batch consistency.
Easy to operate and maintain:The structure is designed for ease of use, and cleaning and color changing are convenient.
Wide applicability:Not only applicableRecycled plastic fragments (PET/PE/PP/ABS bottle flakes, film flakes)Dry coloring is also suitable forEngineering plastics (PA, PC)Dehumidification, drying, and blending modification.
Enhance product quality and added value:Ensuring raw materials are dry prevents air bubbles and breakage during extrusion, and improves particle gloss and mechanical properties; precise mixing lays the foundation for the production of high-value modified and specialty materials.
IV. Key Application Scenarios and Technical Parameters
Typical application scenarios:
Production of colored recycled plastic pellets:The washed, unbleached fragments are dried and then dyed in various colors.
Production of filler/modified masterbatches:The carrier resin, filler (such as calcium carbonate), and additives are premixed.
Functional granulation:Flame retardants, antioxidants, toughening agents, etc. are added.
Dehumidification, drying and mixing of hygroscopic plastics (such as PET, PA, PC).
Location within the production line:
[Washing and dehydrating wet debris] → 【Drying and Mixing Machine】 → Intermediate storage silos/conveyors → [Extrusion Granulation Main Unit]
Technical parameters (example):
model:DH-500 (named according to its effective volume of 500L)
Effective volume:500L (can process approximately 150-250kg of material, depending on the material's bulk density)
Stirring power:7.5-11 kW (Variable Frequency)
Heating power/method:36 kW / Electric heating (or matching steam consumption)
Fan power: 5.5 kW
Mixing uniformity: ≥99%
Final moisture content:It can be reduced to ≤0.5%.
Temperature control accuracy: ±2°C
V. Selection and Operational Points
Key selection criteria:
Determine volume based on production capacity:Batch processing capacity must match the hourly output of the extruder.
Select configuration based on material characteristics:Processing PET requires higher drying temperatures (typically >160°C) and longer drying times; processing lightweight film materials requires consideration of agitation and anti-winding designs.
Automation requirements:The choice between the basic model and the advanced model with PLC, automatic feeding, and weighing depends on the production scale.
Operation and maintenance:
Overloading is strictly prohibited.The amount of material loaded must not exceed the rated volume.
Follow the process curve:Set reasonable heating, temperature control, and cooling times and temperatures.
Regular cleaning:When changing colors or materials, thoroughly clean the tank and filter to prevent cross-contamination.
Check seals and lubrication:Ensure the spindle is properly sealed and regularly add lubricating oil to the transmission parts.
