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Sulzer Mixpac Systems for 2-Component Adhesives (pdf)Metering - Mixing - Dispensing for Industry applications
Sulzer Mixpac offers a wide range of pistons for various types of cartridges.
Self-bleeding piston:
During insertion, the micro-valve bleed button is activated, causing almost all the air [CE1] between the piston face and the filled material to escape. This one-step insertion process typically speeds up cartridge filling by about 25%, and yields just about the most complete air exhaustion possible!
Weldable piston:
During insertion, air escapes through a molded-in vent hole. After the piston is set in place, a hot tip is used to heat seal the vent closed. This piston type avoids the possibility of shim damage to the piston lip seals during insertion, which could cause leaking. This is especially important with very thin materials.
Solid piston:
During insertion, a shim is placed along the inner wall of the cartridge barrel, allowing air to escape while the piston is set in place. The shim is then withdrawn. It is recommended that a Teflon shim (preferably flat) be used to minimize the possibility of lip seal damage.
Since a correct setting of the pistons is essential for a leak-free cartridge, we strongly recommend following the instructions relating to the use of 2-K cartridges and double syringes.