Sandwich – paneli.Klei and materials for their development sendvichey.Tendentsii competition in the manufacture of sandwich panels is growing. Companies moving towards cheaper cost. Economy puts their priorities in the selection of raw materials for sandwich panels. Interesting changes await us in the market of external walling, the sandwich panels is based on mineral wool, expanded polystyrene and polyurethane foam. The market value of mineral wool slabs are about 1.5 times higher than that of the foam. In this Minplita sold about twice as expensive as its cost. Not far off the fall in prices for Minplita, and then Minplita cost and foam on the market will be equal. Price foam will not fall, because the profit on its production and so is minimal.
Non-combustible mineral wool to press very soon, much foam on the market sandwich panels. Polyurethane sandwich panels are currently the best in terms of teplosberezheniya and mechanical characteristics. The problem is their low fire resistance. However, replacing polyurethane foam is a foam tsianauratnaya, which practically does not burn. By the year 2010 will come into effect restrictions on the use of combustible materials in construction, and to press strongly tsianauratnaya foam polyurethane.
Existing lines producing polyurethane sandwich will have to change the site of injection and mixing ingredients. New pre-equipped with modern lines of the respective device, working as a polyurethane foam, and the tsianauratnoy such equipment company "Yongming". In the production of sandwiches made of PVC as an "internal" list is almost universally used a cheaper high-impact PS (polystyrene) or ABS. Polystyrene, by the way, stronger than PVC and 0.7 mm thickness for PS is sufficient in case of production to sandwiches window slopes. Excellent high-impact PS is produced by LLC "PolimerMarket", and the most reliable polyurethane adhesive for him – TOP-UR-E-PVC. PVC sheet has long been widely used with a thickness of 0.9 mm, or even 0.8 mm, 1.0 mm and not as it was originally. The best adhesive for sandwich panels remain polyurethane. There is an active search for other cheaper for a base polymer adhesive. But while nothing can come close to polyurethane adhesives for weather resistance and hardiness. One-component polyurethane adhesives costs have long been caught up with two part. A matter of choice of glue – it is a question of equipment used for the production of sandwiches. On continuous lines applies only component polyurethane adhesive. On shotgun assembly lines are applied one-component polyurethane adhesives cure at different rates. Two component adhesive less technologically in the case of bench lines, although some companies have traditionally apply it to this day. Polyurethane adhesive consumption is reduced to 100-120 grams per square meter sandwich panels. More economical use of polyurethane adhesives with low density. Distinguish between low-density glue easily even visually: the glue is transparent, although it may be the color from colorless to red-brown, such as adhesives mark TOP-UR-E-PVC – colorless, and mark TOP-UR-40 yellow-brown adhesive minimum density of 1.1-1.15 g / ml and therefore most economical for consumption. Polyurethane adhesives are high-density: 1.4-1.5 g / ml, is filled with so-called polyurethane adhesives. K-filled polyurethane adhesives include adhesives, most brands and Macroplast Isolemfi. They are opaque, and their color beige or cream. The color is caused by kaolin or chalk, which they introduced to reduce the cost. Filled with polyurethane glues is very heavy, and its relative cheapness, they do not justify – adhesive consumption is quite large, at a cost manufacturer sandwiches even more expensive.