Franz Kaldewei Gmbh & Co.

Franz Kaldewei Gmbh & Co. Kg

Fritz Pieper

The invention relates to a sanitary tub with an outer shell made of steel sheet, an inner shell made of plastic, and an intermediate layer connecting the two shells. A protective coating is applied to the outer shell to protect against corrosion. The outer shell is provided with a coating applied to both the inner and outer sides. This coating consists of a conversion layer produced by phosphatizing, and a lacquer forming on the outer side the abrasion and impact resistant protective coating. On the inner side of the shell an agent effectively imparts adhesion between the steel sheet and the intermediate layer without mechanical roughening.

Sanitary tub

A method for producing a composite bathtub having at least one steel shell and at least one acrylic shell which are solidly joined to each other. A deep-drawn acrylic blank is first reverse-drawn over a core. An outer shell mold is then placed over the acrylic blank, at a certain distance from the acrylic blank. Once the outer shell mold and the acrylic blank are sealed off from each other, a reaction resin is injected into the space between the two shells. After the reaction resin has set, the outer shell mold is removed and the steel blank is positioned. The space between the steel blank and the acrylic blank is re-sealed and a polymer foam is injected into this intermediate space. Once the polymer foam has cross-linked, the composite bathtub is complete. One advantage of the method of this invention is that the acrylic shell and the steel exterior of the composite bathtub do not have to be identical in shape.

Method for producing a composite bathtub

A process for producing deformable acrylic panels with increased resistance to abrasion and scratching preferably for sanitary articles to be produced by the deep-drawing process. Immediately prior to the deep-drawing step, a type of lacquer is applied to an acrylic panel. The lacquer contains dispersed nanoscale particles preferable of an inorganic material. The semifinished acrylic panel is heated and subsequently deep-drawn. The lacquer coating is applied to the semifinished acrylic panel with the help of rollers or a doctor blade. In addition, the lacquer coating can be applied by immersing or flooding the semifinished acrylic panel.

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Delmenhorst, Germany

Fritz Pieper