Why 3K Static Mixers Are Becoming Essential in Modern PU Sealant Production

Recently, one of our international customers approved a new 3K static mixing project after previously purchasing our aluminum tube filling machine for polyurethane sealant production.

What makes this project interesting is not simply the equipment itself, but the production logic behind it.

The customer is developing new PU products and requires a 3K static mixer to enable simultaneous material supply to both their existing sausage filling line and newly installed aluminum tube filling machine.

This reflects a growing trend in the polyurethane sealant industry:

Manufacturers are no longer producing only standard PU formulations. More customers are developing customized products with specific colors, curing speeds, and performance characteristics for different end-use markets.

Why do PU manufacturers need a 3K static mixer?

A typical polyurethane sealant production process starts with a PU prepolymer base material.

To create differentiated products, manufacturers often add additional components inline, such as:

✅ Color paste / pigment paste
✅ Catalysts / accelerators
✅ Adhesion promoters
✅ UV stabilizers and specialty additives

This allows manufacturers to produce multiple customized formulations from one base material.

Benefits include:

✔ Flexible formulation switching
✔ Longer shelf life of base material
✔ Precise additive dosing
✔ Reduced material waste
✔ Faster product development cycles

Why combine a 3K static mixer with filling equipment?

Typical production flow:

PU base material
→ 3K static mixing system
→ Filling machine
→ Final packaging

Suitable packaging formats include:

Sausage packs

• Construction sealants

• Waterproofing

• Expansion joints

Aluminum tubes / cartridges

• Automotive adhesives

• Industrial bonding

• DIY and retail products

This integrated solution enables real-time additive dosing and immediate packaging.

Great Machinery 3K Static Mixing System – JTH-X3-600

Our JTH-X3-600 static mixing system is designed for synchronized extrusion and mixing of:

• Base material

• Color paste

• Additives

Widely used in:

• Silicone sealants

• Polyurethane sealants

• Solar PV sealants

Key Features

✅ Additive flow monitoring with ±3‰ accuracy
Ensures additive deviation per product is tightly controlled.

✅ Pressure monitoring inside mixing pipeline

✅ Air detection inside material flow

✅ Hydraulic synchronized extrusion system

✅ Adjustable volumetric dosing ratio

✅ Static metering system for stable ratio adjustment

✅ Fault alarm and operation reminder functions

Key Technical Specifications

• Control system: Inovance PLC +  touchscreen

• Production speed: 18–20 pcs/min

• Filling range: 300–600 ml

• Filling accuracy: ±3 g / 600 ml

• Static mixing core: Φ58 × 900 mm

• Motor power: 22 kW

• Total equipment power: 27 kW

• Working hydraulic pressure: 16–18 MPa

• System pressure: 21 MPa

• Cooling: Circulating water cooling

• Machine dimensions: 3900 × 1500 × 2544 mm

Built for customization and future automation

As PU manufacturers increasingly pursue product differentiation, a standalone filling machine is no longer enough.

Integrated solutions combining:

• Static mixing

• Precision dosing

• Flexible filling formats

are becoming essential for modern sealant production.

At Great Machinery, we provide complete process-oriented solutions including:

• 3K static mixing systems

• Sausage filling machines

• Aluminum tube filling machines

• Customized packaging automation lines

Helping customers move faster from formulation development to scalable production.

For full technical specifications or customized project discussions, feel free to contact us.

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