Provided are a packaging sheet and a packaging container where it is unnecessary to paste a printed label and disappearance or color development due to friction or the like after thermal printing do not occur. The packaging sheet includes a heat seal layer 10 for thermally welding by heating, a heat-sensitive layer 40 including a color developing material that develops a color by heating, and a base material layer 70 that secures the strength and protects the heat-sensitive layer 40. The heat seal layer 10, the heat-sensitive layer 40, and the base material layer 70 are provided in this order from a back surface side in a thickness direction. The packaging sheet is transparent before the heat-sensitive layer 40 develops the color.

A thermosensitive recording medium according to an embodiment of the present disclosure includes: a recording layer that includes a coloring compound having electron-donating property, a developer having electron-accepting property, a photothermal conversion agent, and a polymer material; and a protective member that is stacked on the recording layer, and has a convexo-concave shape in a plane.

A system includes an unpatterned heater configured to pre-heat a thermochromic coating disposed on a substrate to a first temperature. The thermochromic coating has a threshold temperature at which the thermochromic material undergoes a color change. The system also includes a patterned heater comprising multiple heating elements configured to heat selected pixels of the thermochromic coating to a temperature at or above the threshold temperature according to a predetermined pattern. An air gap is maintained between the multiple heating elements and the thermochromic material while the patterned heater is heating the thermochromic material. The air in the air gap heated to a second temperature.

A system includes an unpatterned heater configured to pre-heat a thermochromic coating disposed on a substrate to a first temperature. The thermochromic coating has a threshold temperature at which the thermochromic material undergoes a color change. The system also includes a patterned heater comprising multiple heating elements configured to heat selected pixels of the thermochromic coating to a temperature at or above the threshold temperature according to a predetermined pattern. An air gap is maintained between the multiple heating elements and the thermochromic material while the patterned heater is heating the thermochromic material. The air in the air gap heated to a second temperature.

A system includes an unpatterned heater configured to pre-heat a thermochromic coating disposed on a substrate to a first temperature. The thermochromic coating has a threshold temperature at which the thermochromic material undergoes a color change. The system also includes a patterned heater comprising multiple heating elements configured to heat selected pixels of the thermochromic coating to a temperature at or above the threshold temperature according to a predetermined pattern. An air gap is maintained between the multiple heating elements and the thermochromic material while the patterned heater is heating the thermochromic material. The air in the air gap heated to a second temperature.

A system includes an unpatterned heater configured to pre-heat a thermochromic coating disposed on a substrate to a first temperature. The thermochromic coating has a threshold temperature at which the thermochromic material undergoes a color change. The system also includes a patterned heater comprising multiple heating elements configured to heat selected pixels of the thermochromic coating to a temperature at or above the threshold temperature according to a predetermined pattern. An air gap is maintained between the multiple heating elements and the thermochromic material while the patterned heater is heating the thermochromic material. The air in the air gap heated to a second temperature.

A thermochromic composition including a dye molecule; a matrix, wherein the matrix comprises a material having a defined melting point; and an optional developer. A process for preparing a thermochromic composition, including providing a dye; heating a matrix above its melting point; adding the heated matrix to the dye until the dye dissolves in the matrix; optionally, adding a developer; wherein the thermochromic composition exhibits a first color at a first temperature and a second color at a second temperature; wherein the first color and the second color are different; and wherein the first temperature and the second temperature are different.

A water-dispersible sheet with improved water dispersibility is provided. Provided is paper-making fibers containing two kinds of compounds, a specific alkalized fibrous carboxyalkyl cellulose and a specific carboxyalkyl cellulose salt. That is a water-dispersible sheet comprising a papermaking fiber and an alkalized fibrous carboxyalkyl cellulose and further comprising a carboxyalkyl cellulose salt, wherein the degree of etherification of the fibrous carboxyalkyl cellulose is 0.2 to 0.6, the degree of etherification of the carboxyalkyl cellulose salt is 0.5 to 1.6, the viscosity of 1% aqueous solution of the carboxyalkyl cellulose salt measured by Brookfield viscometer is 2 to 200 mPa-s, and the ratio of the carboxyalkyl cellulose salt to the sum of the papermaking fibers and the alkalized fibrous carboxyalkyl cellulose is 0.1 to 10% by weight.

The resin composition for laser marking and for laser welding contains, 100 parts by mass of a thermoplastic resin, 0.002 to 10.000 parts by mass of a bismuth compound, and 0.1 to 5.0 parts by mass in total of two or more types of non-black organic pigments.

The resin composition for laser marking and for laser welding contains, 100 parts by mass of a thermoplastic resin, 0.002 to 10.000 parts by mass of a bismuth compound, and 0.1 to 5.0 parts by mass in total of two or more types of non-black organic pigments.