No-Bake: The cold curing process
Synthetic resins have been used since the early 1960s to produce moulds and cores for large and one-off castings. H眉ttenes-Albertus was one of the pioneers in the field of synthetic resins. The introduction of furan cold-curing resins in foundries and the development of cold-curing phenolic resins set important milestones.
In order to meet the steadily increasing requirements of foundries and their customers over the past decades, our No-Bake binder systems are continously optimized through intensive research and continuous further developments.
The No-Bake binder systems are used in the production of small, large and very lage moulds and are characterised by the fact that they can be optimally adapted to the requirements of the castings and the production processes in the foundry.
The flexibility of the systems is also the reason why modified No-Bake binders are used on most 3D printers worldwide. This is ensured not only by the uncomplicated processing, but also by the high storage stability of moulds and cores.
Our No-Bake product portfolio
Furan resin
This classical all-purpose method for production of nearly all types of castings features:
What its special features are:
- Low binder addition level
- Low viscosity
- Long storage life
- Good through curing
- Low odor
- Low emissions
- Easily recoverable used sand
- Nitrogen-free grades of resins that are particularly suitable for high-quality steel castings
- Reactive, rapidly curing specialty resins offering short stripping times
- Low-sulphur systems for high-quality ductile iron, marked decrease in SO2 emissions during and after pouroff
Polyurethane-No-Bake
Reactive system for short and medium serie. Special features:
- even more environmentally-friendly due to improved solvents
- short curing times despite a relatively lengthy sand bench life
- Low binder addition levels
- Unsurpassed sand flow
- Smooth, firm mouldings
- Good separation from core boxes
- Low odor nuisance
- Free of sulphur and phosphorous
- Good surfaces in steel casting, free of cracks
- Low tendency for heat cracking
Resole-Ester process
This method is used for high-quality steel castings, in particular steel castings, with the following properties:
- very good casting surfaces
- considerable reduction of finishing costs
- free of nitrogen, sulphur and phosphorous
- patterns are easiliy stripped
- low pollutant emissions during curing and pouroff
- low carbon uptake in steel casting
- low tendency for heat cracking and finning
- good collapse properties
Best Practice
In order to be able to reliably produce castings in hand-mold and large-scale casting, process-safe binder systems for mold and core production are also required.
The following two examples show how precisely suitable product solutions have been developed through intensive cooperation with our customers.
