Selection of hot melt adhesives for the concrete industry
The use of hot melt adhesives in the concrete industry has considerably optimised the production process. Components for recesses in prefabricated components (e.g. for sockets) can be fixed to the formwork quickly and easily. Once the concrete part has been set the parts can be removed again without leaving any residue. There is no need to use magnets or adhesive tape which saves time and money.
With the usage of hot melt adhesives in the concrete industry the manufacturing process could be optimized:
- Reduced time consumption in fast and secure fixing of components on the steel formwork (e.g. plastic or styrofoam spacer)
- Parts can easily be removed from the formwork without residues
- Quick and safe application without using magnets or adhesive tape
Our hot melt adhesives for solvent-based, conventional form oils:
- Universally applicable but with a lower cold flexibility: 0090.2
- In a very cold environment (very good flexural strength) with very good spraying properties: 0524
- In a rather warm environment (good thermal resistance) and easy to spray: 0715
Our hot melt adhesives for water-based form oils:
each with good spray capability and a particularly lower cold flexibility:
- for water-based without frost and corrosion protection: 1694
- for water-based with frost and corrosion protection: 2097
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Hot melt adhesives for the application of water-based form oils (emulsions):
A variety of influencing factors must be taken into account when using water-based release agents because of the widely known difficulties in bonding to water. Also to be considered is the fact that – dependent on the environmental conditions (temperature,humidity) at a manufacturing plant – water evaporates faster or slower.Optimum production conditions for the use of water-based form oils:
- Spraying of release agent after application of components on the steel formwork
When applying form oil before fastening the components:
- Sufficient evaporating time before applying adhesive to the release agent (guide value approximately 8-10 minutes)
- Wipe away any release agent residue before fixing the component to the metal plate
- Bead application with a bead thickness of approximately 5-6 mm
- Hall temperature approximately 18°C - 20°C
- Temperature of the metallic plate before the release agent is applied approximately 35°C - 40°C
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NB:
The release agent should sufficiently be evaporated until it gets into contact with the hot melt adhesive. This is supported by a warm metallic plate and an adequate hall temperature. Compared to spraying the glue the application of a bead helps to improve the evaporation of the water in the release agent thanks to the higher adhesive (ttemperature) energy in the bead.
