POLYSTYRENE-BASED RESIN FOAM SHEET AND POLYSTYRENE-BASED RESIN FOAM CONTAINER

• Main Author: HOSOKAWA SATORU
• Format: Patent
• Language: English; Japanese
• Published: 08.10.2020
• Subjects: ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS,e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES,DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; CONVEYING; GENERAL PROCESSES OF COMPOUNDING; HANDLING THIN OR FILAMENTARY MATERIAL; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PACKAGES; PACKAGING ELEMENTS; PACKING; PERFORMING OPERATIONS; STORING; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING-UP

To provide a polystyrene-based resin foam sheet which can further improve the buckling strength of a container, and a polystyrene-based resin foam container.SOLUTION: A polystyrene-based resin foam sheet for a container having a foam layer, in which a density (D0) of the foam layer is 0.045-0.165 g/cm3, the foam layer has a density (D1) in an area a1 to 200 μm in a thickness direction from the surface of one surface A is 0.085-0.446 g/cm3, and a density (D2) in an area a2 to 200 μm in a thickness direction from the surface of another surface B is 0.050-0.349 g/cm3, a ratio represented by the density (D1)/the density (D0) is 1.90-2.70, a ratio represented by the density (D2)/the density (D0) is 1.11-2.11, and a ratio represented by the density (D1)/the density (D2) is 1.28-1.71.SELECTED DRAWING: Figure 1 【課題】容器の座屈強度をより高められるポリスチレン系樹脂発泡シート及びポリスチレン系樹脂発泡容器。【解決手段】発泡層を有する容器用のポリスチレン系樹脂発泡シートであって、前記発泡層の密度（Ｄ０）が０．０４５〜０．１６５ｇ／ｃｍ３であり、前記発泡層は、一方の面Ａの表面から厚さ方向に２００μｍまでの領域ａ１の密度（Ｄ１）が０．０８５〜０．４４６ｇ／ｃｍ３であり、前記発泡層は、他方の面Ｂの表面から厚さ方向に２００μｍまでの領域ａ２の密度（Ｄ２）が０．０５０〜０．３４９ｇ／ｃｍ３であり、前記密度（Ｄ１）／前記密度（Ｄ０）で表される比が１．９０〜２．７０であり、前記密度（Ｄ２）／前記密度（Ｄ０）で表される比が１．１１〜２．１１であり、前記密度（Ｄ１）／前記密度（Ｄ２）で表される比が１．２８〜１．７１である、ポリスチレン系樹脂発泡シート１。【選択図】図１