Laminated part made of external layers and polyurethane sandwich material and producing method thereof
A manufacturing method, technology of polyurethane resin, applied in the field of laminated parts, which can solve problems such as heavy parts
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Embodiment 1
[0063] Mats B) of short glass fiber strands having a GSM (grams per square meter) of 450 were placed on both sides of a core (A) comprising a 5 / 5 corrugated cardboard type, thickness 12 mm, GSM 960 Paper honeycomb onto which a total of 1150 g of polyurethane formulation 1 (P) was sprayed at normal temperature. This sandwich structure was inserted into a mold, in which a standard primer coated with a thickness of 0.85mm and a density of 2,640kg / m2 was placed in the lower part. 3 , The initial flexural strength is 2.18×10 5 N·mm 2 The aluminum sheet is used as the outer layer C), and a decorative textile with a PUR sheet forming a foam penetration barrier is placed on the top as a decorative layer D) with a GSM of about 180. The bonded fabric was then pressed in the mold to a wall thickness of 11.7 mm and heated to 110°C. After a press time of 240 seconds, the model was opened and the finished laminated part was removed. The laminated part has 444kg / m 3 density and 5.20 x 1...
Embodiment 2
[0066] The production method used was similar to that described in Example 1 above. In this example, a paper honeycomb with a thickness of 5 mm, a GSM (grams per square meter) of 395, and a 5 / 5 corrugated cardboard type was used as the core A), and 1000 g of polyurethane formulation 1 (P) was applied to the Short glass fiber strands on both sides of the core A) are placed on B). The aluminum sheet used as the outer layer C) has a thickness of 0.35mm and a density of 2540kg / m 3 , the initial flexural strength is 1.5×10 4 N·mm 2 . A textile with a GSM of 180 and a barrier against foam penetration is used as upholstery D). The 4.9mm thick laminated part obtained after pressing at 110°C has 654kg / m 3 The density and 8.56×10 6 N·mm 2 of flexural strength. The initial flexural strength of the outer layer C) is increased by a factor of 560.
Embodiment 3
[0068] The production method used was similar to that described in Example 1 above. In this example, a paper honeycomb with a thickness of 7 mm, a GSM (grams per square meter) of 560, and a 5 / 5 corrugated cardboard type was used as the core A), and 900 g of polyurethane formulation 1 (P) was applied to the Core A) on both sides of the short glass strand pad. Using a blend of ASA (acrylate-modified styrene-acrylonitrile terpolymer) and PMMA (polymethylmethacrylate), the thickness is 1.40mm, and the initial flexural strength is 3.43×10 4 N·mm 2 A dense thermoformed multi-layer thermoplastic film as the outer layer C). A textile with a GSM of 180 and a barrier against foam penetration is used as upholstery D). The mold temperature during the pressing operation was about 60°C on the outer layer side and about 90°C on the decorative layer side. The resulting 7.2mm thick laminated part has 517kg / m 3 The density and 5.71×10 6 N·mm 2 flexural strength.
[0069] As a result of ...
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Abstract
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