Static mixer and method for mixing a main component with an additive

Method according to one of the foregoing claims, characterized in that the streams of unmixed main component to create the jacket in the inlet region of the static mixer element (3, 9) are discharged from the stream of main component and additive entering this element, and fed to the mixing component stream in the outlet region of the mixer element (3, 9).

Method according to one of the foregoing claims, characterized in that a multistage static mixer element (3, 9) is used, and the streams of unmixed main component fed in for jacketing are discharged in the region between the mixer element stages, specifically, in the region before the penultimate and/or last mixer element stage, viewed in the direction of flow, from the stream of main component and additive traversing these features, and are fed to the mixing component stream after this mixer element stage or these mixer element stages.

Method according to one of the foregoing claims, characterized in that a static mixer element (3, 9) with swirl blades (9) is used, and specifically that layered addition of the additive to main component occurs.

Method according to one of the foregoing claims, characterized in that the main component is a highly viscous single-component adhesive, and the additive is a hardening accelerator, and specifically that the single-component adhesive is PU.

Application of the method according to one of the foregoing claims to generate an adhesive bead having a core of PU with hardening accelerator added layer-by-layer and having an envelope of unmixed PU for adhesively bonding components together.

Static mixer, specifically for implementing the method according to one of the foregoing claims, including a mixer channel formed by mixer channel housing (5), and mixing means (3, 9) arranged in the mixer channel for mixing a main component with one or more additives during passage through the mixer channel, characterized in that the static mixer (1) has feeder means (6, 7, 8, 21) discharging into the mixer channel to feed one or more streams of unmixed main component or an additional component to the outer region of a completely or partially mixed mixing component stream coming from the mixing means (3, 9) to form a complete or partial jacket of unmixed main component or of the additional component surrounding the mixing component stream, wherein the feeder means (6, 7, 8, 21) have one or more secondary channels (6, 21) located within the static mixer (1) to convey a main component or an additional component, and the feeder openings (8) are arranged axially after the last mixing means (3, 9), viewed in the direction of flow.

Application of the static mixer, mixer insert, mixer channel housing, mixer channel extension, or mixer blade element according to one of claims 8 to 49 to process highly viscous single-component adhesives with hardening accelerators, specifically, for processing highly viscous PU with hardening accelerator paste.