Color Masterbatch (Powder) Dosing Machine
Color Masterbatch (Powder) Dosing Machine
Multiple domestic factories for bidding. Free promotion. Price to be negotiated between winning bidder and buyer.
Please provide below information for posting:
Model or functional requirements; 2. Dosing channels: single‑color, dual‑color, tri‑color; 3. Drying capacity; 4. Purchase quantity
表格
| Type | Working Principle | Dosing Accuracy | Core Advantages | Main Limitations | Typical Application |
|---|---|---|---|---|---|
| Volumetric Masterbatch Doser | Measures material volume by adjusting screw rotation speed to control addition ratio. | ±1%‑±3% | Simple structure, cost‑effective, easy operation; suitable for general applications with uniform pellets and loose ratio tolerance. | Requires regular manual calibration; affected by material density variation; relatively low accuracy. | Ordinary injection‑molded parts, extruded products, regrind addition, masterbatch proportioning. |
| Gravimetric Masterbatch Doser | Real‑time weighing via high‑precision load cell, closed‑loop control for addition ratio. | ±0.1%‑±0.5% https://www.shini.com.cn/ep_edm/tw/contect_291.html | Extremely high accuracy, no manual calibration; stores up to 50 recipes, automatically compensates density changes; fits multi‑component precise proportioning. | Higher equipment cost, relatively complex structure. | Precision injection molding, engineering plastic modification, multi‑layer co‑extrusion film, high‑end optical products requiring strict dosing accuracy. |
Important Note: In industry terminology, “metering‑type masterbatch doser” generally refers to volumetric type, and the two terms are often used interchangeably shturl.cc/wa4JrBxnH2MHOE2zuWhK7q17xWcyT. Gravimetric dosers are further divided into loss‑in‑weight type (higher accuracy, independent weighing for each material) and gain‑in‑weight type (centralized weighing).
Classification by Dosing Channels: Single‑Color vs Multi‑Color
Select models with different channels according to the number of masterbatches or additives.
表格
| Type | Structural Features | Core Advantages | Typical Application |
|---|---|---|---|
| Single‑color Doser | One main unit equipped with one metering screw and hopper for one single masterbatch or additive. | Simple structure, low cost, convenient maintenance. | General injection & extrusion production requiring only one color. |
| Dual‑color / Tri‑color / Four‑color Doser | One main unit integrated with two or more independent metering units for simultaneous feeding of multiple masterbatches or additives. | Multi‑function in one unit, space‑saving; supports mixing multiple colors or simultaneous feeding of functional additives such as antistatic agents and UV absorbers. | Precision products requiring multi‑component feeding (base masterbatch plus functional pellets), multi‑color co‑extrusion products. |
Core Specifications: Key Selection Indicators
Output / Feeding Rate (kg/h): Weight of masterbatch or powder dosed per hour, core index for production capacity. Range: 0.05 kg/h (micro‑screw) up to 300 kg/h (large‑size screw) or higher. Selection example: Molding cycle 25 s, shot weight 300 g, masterbatch ratio 5%, required masterbatch consumption approx. 5.4 kg/h; select model with output range 0.2‑8 kg/h or 0.3‑10 kg/h. Selection tips: Calculate required output by hourly material consumption × masterbatch ratio; keep working output within the middle range of equipment specification.
Screw Diameter (mm): Critical component determining output range and accuracy. Common sizes: 10 mm, 12 mm, 14 mm, 16 mm, 20 mm, 30 mm, 40 mm, 50 mm, 65 mm. Reference: Small‑diameter screws for micro‑dosing (0.05‑1 kg/h); large‑diameter screws for high‑rate feeding (50‑300 kg/h). Small addition ratio (<5%) recommends small‑diameter screw for metering accuracy.
Dosing Accuracy (%): Core performance metric. Volumetric: Standard ±1%, up to ±3% for some conditions. Gravimetric: ±0.1%‑±0.5%. Selection tips: Volumetric ±1% suffices for ordinary products; gravimetric doser is mandatory for precision goods, expensive additives or ultra‑low ratio (<1%).
Hopper Capacity (L): Influences refilling frequency and continuous production runtime. Common sizes: 40 L (standard), 80 L, 150 L. Reference: Select according to hourly consumption and shift arrangement. Larger capacity reduces refilling frequency yet takes more time for cleaning during color change.
Motor Type: Affects service life and maintenance‑free performance. Hybrid stepper motor: mainstream option, maintenance‑free, long service life and reliable dosing. Brushless DC motor: adopted in partial models, also maintenance‑free.
Control & Functions: Intelligent control core of modern dosers. Basic functions: Micro‑processor controller, synchronized signal with molding machine (melt signal input), automatic speed adjustment following processing rate. Advanced functions: Recipe storage & recall, forced purging for fast color change, low‑level alarm, data logging.
Applicable Material Form: Raw material types the machine can handle. Pellets: Supported by standard masterbatch dosers. Powder: Requires special powder feeder. Problems such as bridging, adhesion and powder leakage shall be considered; twin‑screw plus bridge‑breaking device is normally configured for poor‑flow powder. Important restriction: Gravimetric batch mixer (SGB series) cannot process powder; powder tends to bridge and cause feeding failure, and metering valve will leak powder.
Selection Guidelines
Follow clear logic for masterbatch / powder doser selection: ‑ Determine working principle by accuracy requirement: Ordinary products with loose ratio tolerance: choose volumetric doser for best cost‑performance. Precision products, expensive additives or low addition ratio (<5%): gravimetric doser is mandatory.
‑ Determine model by feeding channels: Single material dosing: single‑color unit. Multiple masterbatches or additives: dual‑color / tri‑color / four‑color unit.
‑ Determine screw specification by consumption and ratio: Calculate required output = hourly material consumption × addition ratio. Select screw diameter so that actual output falls within the middle working range; avoid full‑load or extremely low‑load operation. Small‑ratio feeding (<5%): adopt small‑diameter screw to guarantee metering accuracy.
‑ Determine special model by material form: Masterbatch pellets: standard doser works. Color powder: special powder‑dedicated feeder, preferably twin‑screw type with bridge‑breaking device.
‑ Determine functional configuration by operation demand: Frequent grade / color switching: select unit with recipe storage and forced purging. High‑automation requirement: ensure machine supports molding‑machine signal synchronization and low‑material alarm.
Participation Process
Manufacturers: Contact supplier service for supply registration.
Buyers: Click group‑purchase or contact procurement service to submit requirements. The platform filters suppliers from database or releases bidding based on aggregated demands. Buyers select competitive suppliers and sign sales contracts.
