Blow-in process (thermal insulation material)
In the blow-in process , thermal insulation material is installed in building components using a blow- in machine , which is also known as blow-in insulation . The thermal insulation material is fed into the machine. The blow-in machine fed by a compressor breaks the thermal insulation material compressed in the delivery container into pieces and then loosens it up further. The loosened thermal insulation material is transported together with air via a hose into the components to be insulated. The thermal insulation material is distributed throughout the building component, is compressed by the pressure and thus becomes thermal insulation .
Compressed blowing
Tube bladders
When blown in compressed form, the thermal insulation material is introduced into completely enclosed cavities through an injection opening. At first, the cavity is generally filled with loose insulation from the bottom up. As the filling level increases, the insulation material is compressed by the overpressure prevailing in the cavity during the blowing process. Towards the end of the injection process, the space around the injection opening is filled. In the best case, the insulation material is now space-filling, gap-free and filled with the most even compression possible and is therefore thermally insulated. The even distribution and the installation density are of decisive importance for the thermal insulation properties and the security against settlement.
Injection with a vented injection lance
Prefabricated wall or roof elements or components are often stacked after production or on the construction site. The compartments can therefore only be reached through the thresholds. The component can be completely filled with an injection lance which is pushed in to the far end. The advantage of the rigid injection lance is that the distribution and compaction that has already been achieved can be felt by the filler and, if desired, mechanically re-compacted with a pushing movement. Elements which are airtight due to the materials used or which, due to their structure, do not provide any ventilation options due to imperfections, can be safely filled using a dust bag using passive ventilation.
Blowing in with a vented rotary nozzle
Walls and similar components can be blown in using a vented rotary nozzle. In this process, the air that transports the insulation material is distributed and compressed in a controlled manner and guided out of the component. The ventilation is integrated in the rotary nozzle, so that the blow-in opening serves both for the inflow of the thermal insulation material and for the removal of excess air.
Passive ventilation
With this variant, the excess air is filtered through a dust bag and discharged. The dust bag can be attached to an outlet of the rotary nozzle. The process is automatically started by the overpressure that occurs in the component during the blowing process.
Active ventilation
In this variant, the excess air is actively discharged in a controlled manner by a suction device at the outlet connection of the rotary nozzle.
Open inflation
With open inflation, the thermal insulation material is applied to a surface that is open at the top. The top floor ceiling is often insulated in this way.
Open inflation with no added moisture
In the simplest case, it can be applied with a hose or a rigid pipe.
Open inflation with added moisture
In order to prevent the thermal insulation material from being blown later, moisture can be applied to the finished surface of the thermal insulation material. As a result, the insulating material is crosslinked due to the binding substances it usually contains. Another option is to apply the insulation material with added moisture. This has several advantages. On the one hand, the development of dust during application is considerably reduced. Furthermore, by bundling the thermal insulation material, it can also be controlled and applied in a targeted manner at more distant points. Finally, due to the continuous cross-linking of the thermal insulation material on the overfill, which is supposed to compensate for the settlement to be expected afterwards, can be neglected. Due to the networking, less or no subsequent settlement is to be expected.
Wet spray process
In the wet spray process, moisture is added to the thermal insulation material as it exits the hose. The moisture triggers the binding substances usually contained in the blow-in insulation material to stick the insulation material. As a result, the insulation material can also be applied to walls or ceilings without falling off again, which would certainly be expected with dry insulation material. The moisture is fed to the thermal insulation material by means of spray heads. Typically, several spray nozzles are used, which bundle and moisten the jet of insulation material. The beam, which is surrounded by moisture, and the thermal insulation material, which in the best case is well and evenly moistened, is applied to walls, ceilings or the like up to the desired layer thickness. Optionally, an adhesive can be added to the liquid. This increases the binding effect during application, so that higher layer thicknesses can be achieved or, for example, when spraying overhead allow easier processing.