Heat insulating cup and method of manufacturing the same

A heat-insulating cup, comprising:

• a cup body having a paper side wall and a paper bottom wall;
• and
• A paper protective cover attached to cover the side wall of said cup body,
• wherein said protective cover is prepared by winding a blank of a multi-layer structure including an embossed paper sheet and a paper liner board adhered to said embossed paper sheet, said blank being wound such that said linear board is positioned outside, and
• wherein an inner surface of said side wall is covered with a plastic layer having a thickness of 20 to 60 .mu.m, and a matting treatment is applied to the surface of said plastic layer to enable the plastic layer to have a ten points mean roughness falling within a range of between 10 .mu.m and 30 .mu.m, which is not more than 60% of the thickness of said plastic layer.

A heat-insulating cup, comprising:

• a cup body having a paper side wall and a paper bottom wall;
• and
• A paper protective cover attached to cover the side wall of said cup body,
• wherein said protective cover is prepared by winding a blank of a multi-layer structure including an embossed paper sheet and a paper liner board adhered to said embossed paper sheet, said blank being wound such that said linear board is positioned outside, and
• wherein a surface embossment of a plurality of elements is formed on the outer surface of the liner board to form a projected and recessed pattern, the elements of said projected and recessed pattern having an average width falling within a range of between 500 .mu.m and 1500 .mu.m, and said surface embossment having a ten points mean roughness falling within a range of between 40 .mu.m and 100 .mu.m.

A heat-insulating cup, comprising:

• a cup body having a paper side wall and a paper bottom wall;
• and
• A paper protective cover attached to cover the side wall of said cup body,
• wherein said protective cover is prepared by winding a blank of a multi-layer structure including an embossed paper sheet and a paper liner board adhered to said embossed paper sheet, said blank being wound such that said linear board is positioned outside, and
• wherein said protective cover is adhered to said side wall with an adhesive, which comprises a first part imparted with a pressure to two band-like first regions formed at side end regions of said blank of the protective cover, and a second part imparted without a pressure to at least one second region interposed between the two first regions.

A heat-insulating cup, comprising:

• a cup body having a paper side wall and a paper bottom wall;
• and
• A paper protective cover attached to cover the side wall of said cup body,
• wherein said protective cover is prepared by winding a blank of a multi-layer structure including an embossed paper sheet and a paper liner board adhered to said embossed paper sheet, said blank being wound such that said linear board is positioned outside, and
• wherein said protective cover further comprises a thin paper sheet arranged on at least one surface of said embossed paper sheet and having a basis weight falling within a range of between 20 g/m.sup.2 and 100 g/m.sup.2.

A heat-insulating cup, comprising:

• a cup body having a paper side wall and a paper bottom wall;
• and
• A paper protective cover attached to cover the side wall of said cup body, wherein said protective cover is prepared by winding a blank of a multi-layer structure including an embossed paper sheet and a paper liner board adhered to said embossed paper sheet, said blank being wound such that said linear board is positioned outside, and
• wherein said protective cover further comprises a perforation serving to facilitate the winding operation.

A heat-insulating cup, comprising:

• a cup body having a paper side wall and a paper bottom wall;
• and
• A paper protective cover attached to cover the side wall of said cup body,
• wherein said protective cover is prepared by winding a blank of a multi-layer structure including an embossed paper sheet and a paper liner board adhered to said embossed paper sheet, said blank being wound such that said linear board is positioned outside, and
• wherein a marking as a criterion of liquid pouring into the cup is printed on an outer surface of said side wall of the cup body;
• said side wall is formed of a paper sheet having a basis weight falling within a range of between 170 g/m.sup.2 and 310 g/m.sup.2 and a thickness falling within a range of between 220 .mu.m and 420 .mu.m;
• the paper sheet of said side wall has a Munsell system brightness Bw of a color falling within a range of between 6 and 10;
• said marking has a Munsell system brightness Bm of a color falling within a range of between 0 and 7;
• and the relationship Bw-Bm>3 is satisfied.

A heat-insulating cup, comprising:

• a cup body having a paper side wall and a paper bottom wall;
• and
• A paper protective cover attached to cover the side wall of said cup body,
• wherein said protective cover is prepared by winding a blank of a multi-layer structure including an embossed paper sheet and a paper liner board adhered to said embossed paper sheet, said blank being wound such that said linear board is positioned outside, and
• wherein a marking as criterion of liquid pouring into the cup is printed on an outer surface of said side wall of the cup body;
• an open window is formed in said protective cover to expose at least partly said marking;
• said side wall is formed of a paper sheet having a basis weight falling within a range of between 170 g/m.sup.2 and 310 g/m.sup.2 and a thickness falling within a range of between 220 .mu.m and 420 .mu.m;
• the paper sheet of said side wall has a Munsell system brightness Bw of a color falling within a range of between 6 and 10;
• said marking has a Munsell system brightness Bm of a color falling within a range of between 0 and 8;
• and the relationship Bw-Bm>2 is satisfied.

A heat-insulating cup, comprising:

• a cup body having a paper side wall and a paper bottom wall;
• and
• A paper protective cover attached to cover the side wall of said cup body,
• wherein said protective cover is prepared by winding a blank of a multi-layer structure including an embossed paper sheet and a paper liner board adhered to said embossed paper sheet, said blank being wound such that said linear board is positioned outside, and
• wherein an open window acting as a marking as a criterion of liquid pouring into the cup is formed in said protective cover;
• and said side wall is formed of a paper sheet having a basis weight falling within a range of between 170 g/m.sup.2 and 310 g/m.sup.2 and a thickness falling within a range of between 220 .mu.m and 420 .mu.m.

A heat-insulating cup, comprising:

• a cup body having a paper side wall and a paper bottom wall;
• and
• A paper protective cover attached to cover the side wall of said cup body,
• wherein said protective cover is prepared by winding a blank of a multi-layer structure including an embossed paper sheet and a paper liner board adhered to said embossed paper sheet, said blank being wound such that said linear board is positioned outside, and
• annular embossed line acting as a marking as a criterion of liquid pouring into the cup is formed on the side wall.

A heat-insulating cup, comprising:

• a cup body having a paper side wall and a paper bottom wall;
• and
• A paper protective cover attached to cover the side wall of said cup body,
• wherein said protective cover is prepared by winding a blank of a multi-layer structure including an embossed paper sheet and a paper liner board adhered to said embossed paper sheet, said blank being wound such that said linear board is positioned outside, and
• wherein said embossed paper sheet is derived from a raw material sheet consisting of a corrugated paper sheet having a corrugation which defines a plurality of grooves;
• said embossed paper sheet has a plurality of intersecting grooves, which intersect said grooves of the corrugation;
• and
• said intersecting grooves are arranged at least in a region including either lateral side of the blank.