Heat-insulating foam paper and preparation method thereof

Abstract

The invention relates to heat-insulating foam paper. The heat-insulating foam paper comprises an intermediate paper base layer, an inner lamination layer and an outer lamination layer, and is characterized in that the inner lamination layer adopts an LDPE / HDPE / LDPE three-layer coextruded lamination layer; the three layers of co-extruding materials are in the mass consumption ratio of 1:3-4:1-4 inthe sequence from the paper base layer outwards; the raw material of the outer lamination layer is a blend material which comprises 60 to 80 percent of LDPE and 40 to 20 percent of POE plastics; the melt index of the LDPE plastic is 6.5 dg / min or above; the humidity gram weight proportion of the intermediate paper base layer is controlled to be 7 to 11 percent. The heat-insulating foam paper has an excellent heat insulating effect, good and soft hand feeling and strong velvet feeling, is easy to bind in post processing and forming, and is suitable for industrial production.

Description

technical field [0001] The invention relates to heat-insulating foamed paper and a preparation method thereof. Background technique [0002] With the rapid development of China's economy, disposable paper containers, as convenient daily necessities, have become indispensable daily consumer goods in homes, restaurants, offices and other places for home travel and portability. Its changeable shapes, bright colors, and characteristics of not being afraid of being beaten are loved by many people. However, most of the existing disposable paper containers do not have the function of heat insulation. If the contents are overheated, the heat will be transmitted through the surface of the container. Cold discomfort can also occur when the contents are too cold. [0003] CN200680021764.2 discloses a foam-cardboard laminate, products incorporating it and its preparation method, by extruding LDPE polymer on wet cardboard to provide LDPE-coated cardboard material, thereby costing the p...

AI Technical Summary

Problems solved by technology

However, in the actual operation process, it was found that the surface of this method is thicker due to the thickness of the foaming layer of the ink, which will lead to uneven foaming and easy to produce orange peel.

In the prior art, double-sided coating, the inner surface of the paper container is coated with HDPE blend material, which is to improve the barrier rate of the inner surface. During the heating and foaming process, the water vapor in the paper only overflows from the outer surface. The foam layer is only formed on the outer surface of the paper, while HDPE has a high melting point, and it is difficult to stick when it is processed into a heat-insulated container.

Images