Consistent color is essential in the production of fuse beads, plastic toys, colored bottles and other plastic products.

When manufacturers handle dozens or even more than 200 color formulations, small fluctuations in pigment, masterbatch or additive dosage may cause visible batch differences, uneven shades, dark spots and unnecessary material waste.

The Wensui VGF Loss-in-Weight Blender is designed for accurate and continuous dosing of plastic pellets, powders, masterbatch and functional additives. Its gravimetric control system helps manufacturers maintain stable recipes and improve color consistency across different production batches.

Accurate Gravimetric Dosing

The Wensui VGF system uses loss-in-weight measurement and closed-loop control to monitor the actual material discharge rate.

When the feeding rate deviates from the set value, the controller automatically adjusts the screw speed. Under suitable material and operating conditions, dosing accuracy can reach up to ±0.25%.

This helps manufacturers:

· Reduce batch-to-batch color variation

· Control low-percentage pigments and additives

· Reduce masterbatch overdosing

· Reproduce approved color recipes

· Improve production traceability

Actual accuracy depends on material flowability, feeding rate, screw selection, calibration and installation conditions.

Stable Feeding for Powders and Pellets

Different materials require different feeding structures.

The Wensui VGF blender can be equipped with suitable screw configurations for pellets, powders, regrind and mixed materials. A twin-screw feeding design is available for fine powders, low-bulk-density additives and materials that are difficult to feed consistently.

The system can be used for:

· Color masterbatch

· Pigment powder

· Plastic pellets

· Functional additives

· Powder-and-pellet mixtures

· Recycled plastic materials

Anti-Bridging Design

Fine powders may bridge, compact or stick to the hopper wall, causing unstable feeding.

The Wensui VGF blender is equipped with a horizontal agitator to keep material flowing toward the screw. A vertical agitation system can also be added for difficult materials.

This design helps reduce:

· Material bridging

· Powder accumulation

· Intermittent discharge

· Feeding fluctuation

· Uneven pigment concentration

Easy Cleaning and Fast Color Change

Frequent color changes can increase downtime and contamination risk.

The modular structure of the Wensui VGF blender allows easier access to the hopper, screw and material-contact parts. This simplifies cleaning and helps reduce color residue between production runs.

It is especially suitable for factories producing multiple colors in small or medium batches.

SUS304 Material-Contact Parts

Material-contact parts can be manufactured from SUS304 stainless steel to provide a clean, corrosion-resistant and easy-to-maintain material path.

This makes the system suitable for plastic toys, packaging products, household plastic parts and other applications with strict appearance and cleanliness requirements.

Typical Applications

The Wensui VGF Loss-in-Weight Blender can be used in:

· Fuse bead production

· Plastic toy manufacturing

· Colored plastic bottles

· Injection-molded plastic parts

· Extrusion lines

· Plastic sheets and films

· Transparent plastic products

· Special-effect color formulations

· Additive and recycled-material dosing

Why Choose Wensui VGF

The value of gravimetric dosing is not only higher accuracy. It also gives manufacturers better control over the complete coloring process.

A properly configured Wensui VGF system can help improve:

· Color consistency

· Recipe repeatability

· Material utilization

· Production stability

· Changeover efficiency

· Quality traceability

How to Select the Correct Model

Before selecting a VGF blender, the following information should be confirmed:

· Material type

· Powder or pellet form

· Bulk density

· Number of components

· Dosing percentage of each component

· Required capacity in kg/h

· Minimum feeding rate

· Required accuracy

· Connected processing machine

· Local voltage and frequency

For low-percentage additives, the minimum feeding capacity is often more important than the maximum output.

Request a Wensui Dosing Solution

Every plastic formulation behaves differently.

To recommend the correct Wensui VGF configuration, please provide:

· Raw material information

· Material photos or samples

· Recipe components and ratios

· Required production capacity

· Current color or feeding problem

· Connected production equipment

· Electrical standard

The Wensui engineering team can evaluate your application and recommend a suitable gravimetric dosing and mixing solution.

Frequently Asked Questions

What is a loss-in-weight blender?

A loss-in-weight blender measures the actual reduction in material weight during feeding and automatically adjusts the screw speed to maintain the target dosing rate.

Can the Wensui VGF feed powders and pellets?

Yes. The screw and agitation structure can be configured according to the material type, bulk density and required capacity.

Can it handle low-percentage masterbatch?

Yes, but the feeder must be correctly sized for the minimum dosing rate. Screw diameter, weighing resolution and refill control are especially important.

Is ±0.25% accuracy suitable for every material?

No. Up to ±0.25% may be achieved under suitable conditions. Actual accuracy depends on material properties, capacity, calibration and machine configuration.

Can the machine completely eliminate color differences?

The system can significantly improve dosing consistency. However, final color is also affected by resin quality, pigment quality, processing temperature, mixing performance and equipment cleanliness.