For successful bonding and thermoplastic moulding, correct heating of EVA materials is decisive. Closed heat sources, such as an oven, are always preferable. One-sided warming on a stovetop should be used only for materials up to 8 mm thick, because otherwise it is not possible to guarantee uniform heating throughout.

Recommended Processing Temperatures for nora® EVA Sheets:

• 110° - 130° C: Lunairmed, Lunairflex, Lunalastik
• 120° - 170° C: Lunasoft SLW, Lunasoft SL, Lunasoft AL, Lunalight, Lunacell A
• 120° - 130° C: Lunatec combi 1-6

The temperatures listed vary due to material thickness and density.

The oven should be set to a temperature of 130°–150° C.

Background: At this setting the material reaches a consistent optimal temperature of 120-130° C. This setting is important above all for composite sheets, so that the material is heated uniformly. Please observe the different activation times for the individual composite sheets.

nora® Lunatec combi sheets are vulcanised combinations of proven nora® grades. That means that at least two materials of different Shore hardnesses and densities were permanently fused during the production process and require no further bonding.

In processing nora® Lunatec combi composite sheets it is especially important to observe the recommended activation and cooling times, because the material already consists of multiple layers during heating and cooling and the times have to be adapted accordingly in order to achieve uniform warming all the way into the interior of the material.

A rule of thumb for the optimal cooling time of the material on the last is:

Heating time x factor 2 = optimal cooling time

Cooling can be accelerated by applying a moist, cold cloth or using a vacuum press with a cooling system.

nora® Norit is recommended as a place holder for the covering to be used later. The place holder is formed directly on the last and remains on the last (do not bond) during the processing of other materials.

The place holder is cut to the dimensions of the later insert. In the deep drawing process, this outline is transferred to the materials. Using this outline, the edge of the insert can be cut to size more easily.

Additional benefit: The smooth surface of nora® Norit hides the unevenness of the surface of the last.

We recommend the use of specimen shoe sheeting to ensure a smooth surface, since it hides the unevenness of the last. A smooth surface also provides greater comfort when putting on the shoe.

To ensure better forming of the material in the retrocapital area, we recommend using a pad in the forefoot. During the deep drawing process, the pad is placed on the material to be formed (not incorporated).

For optimal bonding, the following procedure is recommended:

• Both of the materials to be bonded are ground or sanded.
• Apply neoprene or polychloroprene adhesive and leave to air (at least 10 minutes).
• Additional heating to about 50° C intensifies the adhesive effect.
• Bring the materials together under slight pressure and then press.
  

For soft and light materials, such as nora® Lunairmed and Lunairflex, please adapt the pressure in order to avoid compression of the materials, which would impair restoration capability.

Smooth-brushing with a colourless horsehair brush (without application of wax) will make the surface of the EVA material much smoother.