Sheet having closed cell layer
AssigneeDONGSUNG CHEMICAL Co., Ltd.
InventorsSumi Park, Keunmo Kim
Life of this patent
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Abstract
The present invention relates to a sheet having a closed cell layer and, in particular, to an eco-friendly sheet including a plurality of closed cells formed on an eco-friendly resin film, and a print portion on which a predetermined image is printed. The sheet according to the present invention may be prevented from deforming or breaking even from external shocks or severe external environmental conditions, may improve the shape retention of closed cells, the elastic retention of closed cells, and the shape durability of the sheet, may be distinguished due to printing of a specific image, and may have environment-friendly advantages.
Claims9
A sheet having a closed cell layer, the sheet comprising:
- a first resin film layer;
- a cell layer formed on one surface of the first resin film layer and comprising a plurality of closed cells spaced apart from each other at predetermined intervals;
- and
- a print portion formed on at least one surface of the first resin film layer and having a predetermined color or pattern,
- wherein the closed cells are filled with a predetermined amount of air,
- a ratio of a maximum height (Hmax) and a minimum height (Hmin) of the closed cells filled with air is in a range of 1:0.77 to 0.95,
- wherein an internal air density of the closed cells is in a range of 0.09 to 0.5 g/cm3,
- wherein both the first resin film layer and the cell layer comprise a mixture of a biodegradable polymer,
- wherein the mixture comprises polylactide (PLA) and polybutylene adipate terephthalate (PBAT), the content of PBAT is greater than the content of PLA, and
- wherein the sheet having a closed cell layer has a biodegradability of 80% or more as measured according to KS M ISO 14855-1.
Dependencies are inferred from the claim text.