Epoxy for industrial applications is a wide area, but in principle it is products for
- Composite manufacture / Laminating
- Gel coats
- Filament Winding
- Casting resins
- Rapid tooling
Composite materials (or composites for short) are engineered materials made from two or more constituent materials with different physical or chemical properties and which remain discernible. .
Nils Malmgren AB has a wide range of laminating resins for both room temperature curing and heat/post-curing. Available for both hand lay-up and infusion.
Carefully selected raw materials to gain the maximum cooperation with the fibres in the composite to form a perfect construction. We cover most of what is possible and have great flexibility in packaging.
Welcome to discuss laminating system with us.
A gelcoat is a surface layer witch shall bring some property to the composite.
Such properties can be chemical resistance, light resistance, free of pores, gloss, low friction, durability, wearing qualities etc. Gel coats are used both as surface layer in moulds and as surface layer on moulded composites.
Most gel coats has an open window, witch means that lamination has to start when the gelcoat surface is tacky. This can be a big problem in large moulds and in moulds for RTM or VRTM. New technology has overcome this problem, and it is now possible to lay the gelcoat and let it cure before lamination. New technology has also lead to gel coats with very high Tg witch cures at room temperature without brittleness. This makes de moulding before posturing possible.
Nils Malmgren AB has gelcoats for several different types of applications.
Glueing / bonding
Glue refers to a material that is applied between two other materials in order to join them. Nils Malmgren AB’s range of adhesives are often tailor made to fit the customers requirements. Again, it is our flexibility and ability to work with the customer to identify all the problems that make it possible to tailor made special adhesives.
We are happy to fix your problems.
Filament winding is one of the oldest composite manufacturing methods.
Filament winding is a method to place impregnated fibres onto a rotating mould called the mandrel.
The method is mainly used for pipe and tube production. Characteristic for the matrix is a long pot-life and a low viscosity. Filament wounded composites are always post cured at elevated temperature.
Epoxy is used for casting of details in a mould. Epoxy casting resins is also used for production of tools for moulding and vacuum-forming moulds.
Casting resins can be filled or transparent.
The curing reaction of epoxy resin is exothermic. This means that heat is released. An epoxy resin with a high reactivity releases the heat during a short time, while a resin with a low reactivity releases the same amount of heat during a longer time. In general can be said that the larger the casting volume is, the lower reactivity should be used.
If a casting shall be post cured, it is essential to use a temperature ramping up to the curing temperature. The larger volume of the casting is, the longer the ramping time.
Rapid tooling is meant in this context, as mould for the manufacturing of parts. Such production can be sheet metal pressing, polyurethane moulding, RTM (Resin Transfer Moulding), vacuum forming, injection moulding, etc.
The traditional method to produce such tools are by building with fibreglass, having a coupling layer and back casting.
Another method is by direct casting. The choice of epoxy is determined by the requirements of the tool. Often there are requirements for heat resistance and when it is necessary to post-cure the tool at elevated temperature. It is essential that the curing process is done under controlled conditions. The oven must be equipped with control electronics which allow a slow increase in temperature. The slow curing minimizes the risk of internal tensions.
The back casting consists generally of a high filled mass of epoxy and aluminium powder or epoxy and sand. The back casting must be packed carefully in order to provide utility uniformity and strength. Often it is necessary to reinforce the tool for increased strength. The best method is to use external reinforcement, i.e. tool may interact with an outer frame of aluminium.
For more information, please give us a call, +46 303 936 10