High-Viscosity Silicone Sealant Production Line: Planetary & Three-Shaft Mixing Solutions 2026 | POLYC
High-Viscosity Silicone Sealant Production Line: Planetary & Three-Shaft Mixing Solutions 2026
Silicone sealant is a thick, non-flowing paste. It does not pour, it does not pump easily, and any air mixed in shows up later as bubbles in the cured seal. A good production line is built around that: a vacuum mixer that handles the viscosity, a press-out machine that pushes the paste out of the tank, and a filling machine that packs it into cartridges or sausages.
This guide shows how the three stages fit together, how to choose between a planetary mixer and a three-shaft mixer, and what drives the price of the line.
A silicone sealant production line built around vacuum mixing and a hydraulic press-out machine.
The Three Stages of the Line
| Stage | Equipment | What It Does | Price Tier |
|---|---|---|---|
| 1. Mixing | Vacuum double planetary mixer or vacuum three-shaft mixer | Blends polymer, filler and additives into a uniform paste and removes air | Core |
| 2. Press-out | Hydraulic press-out machine | Pushes the thick paste out of the mixing tank without relying on suction | Mid-range |
| 3. Filling | Cartridge or sausage filling machine | Doses the paste into cartridges or foil sausages | Mid-range |
Planetary or Three-Shaft: How to Choose
The deciding factor is viscosity. These ranges come from our current mixer lineup. Your formula, filler content and batch size decide the final choice.
| Mixer | Viscosity Range | Suited To |
|---|---|---|
| Vacuum three-shaft mixer | 200,000 – 500,000 cPs | High-solid pastes that need dispersion and scraping together |
| Vacuum double planetary mixer | Up to 1,500,000 cPs | Very thick pastes that need intensive kneading and de-aeration |
| Above 1,500,000 cPs | Contact us | Our sales engineers will confirm the configuration |
For lower viscosity bands, see our high viscosity mixer guide.
Vacuum Double Planetary Mixer
The blades rotate on their own axes while revolving around the bowl, so they cover the whole mixing area and keep paste from building up on the wall. It runs under vacuum with precise temperature control, and it handles the thickest pastes in our range. See the planetary mixer page.
Vacuum Three-Shaft Mixer
Three shafts work together: a high-speed dispersing shaft, a low-speed screw shaft and a low-speed anchor shaft, with PTFE scrapers keeping the vessel wall clean. It suits pastes with a high solid content. See the three-shaft mixer guide.
Twin vacuum double planetary mixers in a production plant.
Four gantry vacuum planetary mixers during factory assembly.
Vacuum three-shaft mixer for silicone sealant.
Three-shaft agitator detail with PTFE scrapers.
Press-Out and Filling
Once the paste is mixed, it still has to get out of the tank. A thick silicone paste will not flow to a pump on its own, so a hydraulic press-out machine pushes it out from above. From there it goes to a cartridge or sausage filling machine. We cover each machine in its own guide: the hydraulic discharge press and the paste and cartridge filling machine.
Silicone paste vacuum mixer with a hydraulic ram discharge station.
Pilot vacuum sealant mixer with a ram press.
What Affects the Price of the Line
- Mixer type and size: a planetary or three-shaft mixer, and the batch volume you need.
- Vacuum and temperature control: the level of vacuum and the temperature control you specify.
- Press-out machine size: the tank size it has to handle and the pressure the paste needs.
- Filling format and automation: cartridge or sausage, and how much of the loading and capping is automatic.
- Number of tanks: more mixing tanks mean more batches in parallel.
- Layout and installation: the plant layout, and whether you want our engineers on site for installation and commissioning.
Built in Our Own Wuxi Factory
POLYC designs, machines, assembles and tests its equipment in a 9,000 m² factory in Wuxi. We supply the mixers, the hydraulic press-out machines and the filling machines, so the stages of your line come from one manufacturer.
POLYC's 9,000 m² manufacturing base in Wuxi.
Frequently Asked Questions
Should I use a planetary mixer or a three-shaft mixer for silicone sealant?
Why does silicone sealant need vacuum mixing?
Can you handle pastes above 1,500,000 cPs?
Do I need a press-out machine?
Can POLYC supply the whole line?
What is the warranty?
Tell Us About Your Sealant Formula
Send us your paste viscosity, batch size and container format. We will recommend the mixer, press-out machine and filling machine and reply within 24 hours.
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