SKINLAYER FOR FOAM CORE SANDWICH STRUCTURE AND ITS MANUFACTURING PROCESS

• Main Authors: DOERING, RALF, HAHMANN, PAUL
• Format: Patent
• Language: English; German
• Published: 14.09.1994
• Edition: 5
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; ARTIFICIAL STONE; BUILDING; BUILDING MATERIALS; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; FIXED CONSTRUCTIONS; GENERAL PROCESSES OF COMPOUNDING; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; LIME, MAGNESIA; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; REFRACTORIES; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; SLAG; STRUCTURAL ELEMENTS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; TREATMENT OF NATURAL STONE; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; WORKING-UP

A process for manufacturing a plastic foam sheet (1) is specified, in which a starting material is introduced between two skin layers (3, 4) and a chemical foaming reaction of the starting material is initiated, a skin layer material for the sheet with a base of a nonwoven or woven fabric and a coating which is formed from a powdered inorganic material and further ingredients, and a plastic foam sheet (1) with a core (2) of foamed plastic, which is arranged between two layers (3, 4) of a skin layer material. The intention here is for the functional properties of the plastic foam sheet to be improved. For this purpose, in the manufacturing process, the intensity of the foaming reaction is lessened in the region of at least one skin layer (3, 4). The powdered inorganic material thereby undergoes an alkaline reaction or contains at least one component having an alkaline reaction. The foamed plastic has an uneven cell size distribution over the thickness of the core (2), the average cell size in the region of at least one layer (3, 4) being less than in the centre (I) of the core (2).