Coating processes – With post-treatment of coating or coating material – Gas jet or blast mechanically treats coating
Patent
1981-03-20
1984-06-05
Page, Thurman K.
Coating processes
With post-treatment of coating or coating material
Gas jet or blast mechanically treats coating
427366, 427386, 4273899, 427392, 4273935, 427439, B05D 312, B05D 302
Patent
active
044528310
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention concerns a method for the production of foils of elastomeric material, as well as the use of these foils in bonding objects with a high E-modulus, particularly parts in the manufacture of skis, where the foil is inserted as an intermediate layer, which has the effect of reducing the shearing forces which can appear in the adhesive joint during the elastic deformation of the parts bonded to each other, hence particularly in ski production.
STATE OF THE ART
In the bonding of parts with a high E-modulus it is known to insert a rubber foil into the adhesive joint. This is done preferably by coating the surfaces to be joined with each other, as well as the surfaces of the rubber foil with an adhesive that hardens when heated, and then, after inserting the rubber foil as an intermediate layer between the surfaces to be joined with each other, bonding the whole by the application of pressure and heat supply.
In a ski manufacturing method, where a bonding method of this type can be used with advantage, the skis are produced first from at least substantially plate-shaped parts which are bonded with each other.
The deformations to be absorbed by the adhesive joints, when such a ski is stressed for bending, are generally the greater the more rigid the material of the parts to be bonded with each other is, and the shearing forces appearing in the adhesive joint are the greater, the greater these deformations are or the thinner the adhesive joints are. The known method for bonding two parts has the effect that these shearing forces remain within certain limits. The deformation appearing in the bonded zone under bending stress is now absorbed substantially by the intermediate rubber layer. The effect of these intermediate rubber layers is described in detail in Austrian patent application Ser. No. 351,416 of the applicant.
The use of these intermediate rubber layers in the bonding of parts with a high E-modulus is not without problems in practice. First of all, in order to obtain the quality and uniformity of the adhesive joint, the rubber foil used as an intermediate layer should have a thickness of about 0.1 to 0.2 mm with a possibly low thickness tolerance. Rubber foils in this thickness range are very difficult to produce, however, and only with a relatively high thickness tolerance. Thus, e.g. rubber foils with a thickness of 0.13 mm can only be obtained with a thickness tolerance of .+-.0.03 mm, and the quality that can be achieved when they are used as intermediate layers in adhesive joints is therefore limited. Besides, these rubber foils must be subjected additionally to a special surface treatment by wet-chemical methods to obtain a good adhesion in bonding their surfaces.
DESCRIPTION OF THE INVENTION
The invention is based on the problem of providing a method for the manufacture of foils of elastomeric material where the foils can be produced with a lower thickness tolerance than rubber foils and require no surface treatment to increase their adhesive power.
The problem underlying the invention is solved by the method for the production of foils of elastomeric material according to the invention, which is characterized in that polyamines, or polyamines and/or polycarboxyl compounds, or which can preferably be a tangled unwoven fabric, and that the unwoven fabric passes through a zone of elevated temperature where the resins or the impregnating mixture harden and/or dry in foil form to an elastomer, containing the fibers of the unwoven fabric. The resins used in liquid form can be present with advantage in the form of dispersions.
According to an advantageous embodiment of the method according to the invention, when resins based on polyisocyanates are used, these resins are reactive resins of at least one polyisocyanate components and one polyhydroxy-component, which can contain preferably a preliminary product of polyisocyanates and polyhydroxy-compounds. At least one of the polyhydroxy-compounds used in the preparation has the formula ##STR1## where A denotes one of the g
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patent: 4215171 (1980-07-01), Marco et al.
patent: 4271217 (1981-06-01), Tanaka et al.
Blaschke Alfred
Eichberger Walter
Isovolta Osterreichische Isolierstoffwerke Aktiengesellschaft
Page Thurman K.
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