Masterbatch ratio drifts
Shade variation, overdosing and repeated manual adjustment can follow.
Metering & Mixing Machines
Metering & Mixing Machines
Metering and mixing machines can accurately proportion and uniformly mix different raw materials before they enter the injection molding machine, providing a stable supply of material to the machine. Topstar's metering and mixing machines provide precise material metering, uniform mixing, and stable feeding for injection molding and extrusion processes. They feature a stainless steel structure, intelligent control system, and modular design, ensuring contamination-free operation, reduced material waste, and consistent product quality. These metering and mixing machines are compatible with various applications, including virgin materials, recycled materials, and color masterbatches, improving injection molding efficiency, reducing costs, and enabling reliable and repeatable production.
Products
Metering & Mixing Machines
Products
Metering & Mixing Machines
- High Performance
- Reliability
- Durability
- Universally Applicable
TMT Mix Tank
The Topstar TMT mix tank is designed for the metering and mixing of two materials, most commonly new and recycled materials. It integrates material storage and metering functions into a single unit, utilizing a SUS304 stainless steel metering screw to ensure durability and stable performance. The new material is fed at a fixed speed, while the speed of the recycled material can be adjusted via a digital display, allowing for a mixing ratio range of 5% to 70%. The TMT mix tank boasts a metering accuracy of up to ±2%, is simple and intuitive to operate, and is suitable for material recycling in injection molding applications.
TPV Series Proportional Valves
Topstar TPV series proportional valves are used for precise mixing of virgin and recycled materials in injection molding systems. These valves use stable solenoid valves and precise pneumatic cylinders for reliable, adjustable material proportioning. The optimized valve body design ensures smooth material flow and reduces the risk of clogging. When used with automatic feeding systems, the TPV series does not require a separate controller, simplifying installation and operation. It is particularly suitable for in-line recycling systems, helping manufacturers reduce material costs while maintaining consistent production quality.
THM Series Horizontal Mixers
The THM Series Horizontal Mixer is engineered for applications that demand gentle, thorough, and uniform material mixing. Constructed with stainless steel barrels and paddles, it offers excellent corrosion resistance and easy cleaning. The horizontal design allows materials to be mixed evenly, while the 100-degree tilting barrel enables fast and convenient material discharge. A fully sealed structure prevents dust leakage, and integrated safety interlocks protect both operators and equipment. In addition, with a programmable mixing timer from 0 to 30 minutes, the THM Series horizontal mixer provides a safe, clean, and reliable mixing solution for injection molding and plastic processing operations.
TVM Series Vertical Mixers
The Topstar TVM Series Vertical Mixer is a compact, energy-efficient piece of auxiliary equipment for fast, uniform mixing of plastic materials. Featuring a stainless steel mixing barrel with a smooth surface, it ensures easy cleaning and long-term durability. The vertical mixing design delivers strong blending performance within a short cycle time while maintaining low energy consumption. A fully enclosed structure eliminates dust pollution, and built-in safety interlocks ensure secure operation. The TVM series vertical mixer features adjustable mixing times from 0 to 30 minutes and can be optionally equipped with casters for easy mobility, making it suitable for production workshops requiring efficient mixing in limited spaces.
TSM Series Screw Dosers
Screw Dosers are widely used for precise auto-proportional dosing & blending of virgin materials, regrind, masterbatch, and various additives. Equipped with a digital microcomputer controller, it ensures accurate and stable metering even at very low addition ratios. The DC brushless motor offers maintenance-free operation and long service life, while the modular design allows quick replacement of screws and barrels. With up to 50 recipe memory settings, material level detection options, and forced cleaning functions, the TSM Series improves color consistency and production efficiency. Its ability to synchronize with the main screw speed of injection molding machines or extrusion machines makes it an ideal solution for high-precision dosing and automated material control.
TGB Series Gravimetric Blenders
TGB Series Gravimetric Blenders are extensively configured to handle up to 6 different components by dosing, with total throughput from 20kgs/hr to 1000kgs/hr, including virgin, regrind materials, masterbatch, and various additives. The series adapts precision load cells to make a batch blend, resulting in highly accurate readings within 0.3%~0.5 %. (Accuracy tolerances are varied according to batch-to-batch blend ratio.) With multi-level password protection, alarm history records, and compatibility with auto loaders, the TGB Series gravimetric blender delivers maximum material consistency, reduced waste, and intelligent production control. Designed specifically for injection molding applications requiring precise control of material ratios.
Ratio Variation Diagnostic
Control the ratio before variation reaches the molded part.
A stable recipe depends on accurate proportioning and uniform distribution. The right equipment addresses the specific source of variation—not simply the number of materials.
Metering Principle Comparison
The same recipe can require a different control principle.
Compare what each method actually measures, where it performs best and which Topstar platform uses that logic.
| Control Principle | What It Controls | Best Production Fit | Topstar Platform |
|---|---|---|---|
| Gravimetric weighing | Actual component mass through load cells and feedback. | Multi-component recipes with tight batch-to-batch ratio control. | TGB Gravimetric Blender |
| Volumetric screw dosing | Calibrated screw displacement, speed or dosing time. | Masterbatch and additives at low, repeatable addition rates. | TSM Screw Doser |
| Timed / speed proportioning | Valve timing or adjustable regrind screw speed. | Virgin and recycled material control in inline recycling. | TMT Mix Tank / TPV Valve |
| Mechanical batch mixing | Mixing time and physical distribution of prepared materials. | Independent pre-blending, bulk batches and homogenization. | THM / TVM Mixers |
Product Architecture by Function
Choose the control task first. Then choose the machine.
Four platforms control component proportion. Two platforms homogenize a prepared batch. Keeping those jobs separate makes selection faster and more accurate.
Three-Layer Recipe Control Stack
Repeatability comes from measuring, correcting and protecting.
Accuracy at the dosing point must survive recipe changes, cleaning, material movement and day-to-day operation.
Measurement Layer
Measure the actual material input.
Load cells, calibrated screw output, valve timing or speed establish the component ratio.
Load CellsScrew OutputValve Timing
Correction Layer
Return the process to the recipe.
Automatic compensation, stored recipes and machine synchronization reduce recurring setup drift.
FeedbackRecipe MemorySynchronization
Protection Layer
Protect cleanliness and approved settings.
Stainless contact parts, modular cleaning, password levels and alarm history support daily repeatability.
Stainless ContactFast CleaningAlarm Records
Question-Driven Selection
Five questions narrow the product range quickly.
Do not select only from total throughput. The minimum ratio, component count and production method often change the answer.
- 01
How tight is the permitted ratio error?
Tighter multi-component control favors gravimetric weighing; simpler ratios may use volumetric or timed control.
- 02
How many components enter the recipe?
One low-ratio additive differs from a recipe containing virgin resin, regrind, multiple colors and additives.
- 03
Is production batch-based or continuous?
Batch weighing and independent mixers solve different tasks from continuous screw dosing beside a processing machine.
- 04
What are the minimum and peak throughputs?
Size the unit for real demand while verifying stable control at the smallest addition rate, not only the maximum output.
- 05
How often do recipes and colors change?
Frequent changeovers increase the value of recipe memory, modular dismantling, forced cleaning and easy-access material paths.
Tight multi-component control → TGBLow-ratio addition → TSMVirgin / regrind ratio → TMT or TPVIndependent batch mixing → THM or TVM
Material Formulation Architecture
The recipe must remain controlled through every system layer.
Metering and mixing connects upstream material sources with downstream conveying and machine demand. Each layer protects a different part of the formulation.
Layer 04Material Sources
Virgin ResinRegrindMasterbatchAdditives
Layer 03Formulate the Recipe
TGB, TSM, TMT, TPV, THM or TVM measures, proportions or homogenizes the materials.
Layer 02Deliver Without Separation
The feeding and conveying system transfers the prepared blend while maintaining continuity and cleanliness.
Layer 01Follow Process Demand
The controlled recipe enters the injection molding machine or extruder at the required production rate.
Metering & Mixing Knowledge Index
Technical answers for equipment selection.
Open only the question you need. The answer text remains present in the HTML for search and generative-engine retrieval.
01What does a metering and mixing machine do?
It measures defined quantities of virgin resin, regrind, masterbatch or additives and combines them into a controlled recipe before injection molding or extrusion. Depending on the platform, it may weigh, screw-dose, alternate or mechanically mix the materials.
02What is the difference between gravimetric and volumetric dosing?
Gravimetric dosing measures actual mass with load cells and uses weight feedback. Volumetric dosing controls calibrated screw displacement or time, so output depends more directly on material bulk density and calibration.
03When should I choose a screw doser?
Choose a screw doser for continuous, repeatable addition of masterbatch, regrind or additives at relatively low ratios. Confirm dosing rate, screw size, material flow, recipe count and the processing-machine interface.
04Can Topstar equipment mix virgin and recycled material?
Yes. TMT mix tanks, TPV proportional valves, TSM screw dosers and TGB gravimetric blenders support different levels of virgin-to-regrind control. Selection depends on accuracy, throughput and batch or continuous operation.
05Do I need a mixer if I already have a dosing machine?
Not always. Some dosing systems include blending. A separate THM or TVM mixer is useful when a larger prepared batch needs additional homogenization, storage or independent pre-blending before conveying.
06What information is required for equipment selection?
Provide each material, bulk density, component count, target ratios, allowable error, total throughput, batch size, recipe quantity, processing-machine cycle, loading method, cleaning frequency and installation space.
Build a Repeatable Material Recipe
Specify the Recipe, Ratio Tolerance and Production Demand.
Topstar can configure the dosing or mixing platform around your materials and connect it with recycling, conveying and the injection molding cell.
Training for Installation and Operation Correctly
Topstar Service
We have a comprehensive after-sales training system. To address potential issues and ensure optimal operation, we provide you with the necessary training resources for installing and operating the packaging machine.
- Instructions for Use – Installation Steps and Operating Precautions
- Video demonstration of installation and debugging
- On-site training – additional service fee required
Technical Support
Whether your business is located in Europe, North America, or the Middle East, we provide global services, and our experts are on call to provide technical support services through video calls or on-site assistance. Services include:
- First installation and debugging of equipment
- Daily debugging and maintenance
- Emergency fault assistance
- Equipment optimization services
The Machinery Industry Professionals
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- Solutions
- Professional Packaging
- Delivery & Installation
- 24H Technical Support
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