Abstract: An object is to provide a paper barrier material resistant to fractures due to water vapor expansion when heated. As a solution, a paper barrier material is provided, which is characterized in that it comprises a gas barrier layer, a seal layer, a paper base material, and a pigment coating layer, being stacked in this order, wherein the laminate consisting only of the paper base material and pigment coating layer has an air permeation resistance of 2,500 seconds or lower as measured based on JAPAN TAPPI No. 5-2: 2000.

Abstract: Disclosed is method for producing linerless non-top coated thermal printable material (300, 402). The method comprises preparing thermal printable material (200, 302) by receiving base printable material (202), wherein base printable material being 75% w/w to 85% w/w of linerless non-top coated thermal printable material; applying heat-resistant material (204) on base printable material, wherein heat-resistant material being 12% w/w to 18% w/w of linerless non-top coated thermal printable material; applying heat-sensitive material (206) on heat-resistant material to produce thermal printable material, wherein heat-sensitive material being 3% w/w to 7% w/w of linerless non-top coated thermal printable material; and subjecting thermal printable material to supercalendering operation, supercalendering operation comprising passing thermal printable material through at least two calender rolls at temperature ranging from 30° C. to 80° C.

Abstract: A method for manufacturing a paper barrier base material includes a step of applying a water vapor barrier layer coating liquid that contains at least a water vapor barrier resin and a pigment onto a paper base material by a curtain coating method to form a water vapor barrier layer, and a step of applying a gas barrier layer coating liquid that contains at least one polymer selected from water-soluble polymers and water-dispersible polymers onto the water vapor barrier layer by a curtain coating method without a drying step interposed between the two steps to form a gas barrier layer. The gas barrier layer coating liquid has a B-type viscosity equal to or higher than a B-type viscosity of the water vapor barrier layer coating liquid. The method is intended to suppress the occurrence of coating unevenness in wet-on-wet coating by a curtain coating method.

Abstract: The present invention relates to a method of manufacturing heat sensitive recording material for the bar code reader wavelength range of 660–690 nm, the recording material containing a base layer and a coating, and the coating containing at least a color former and a developer. The method of the invention is characterized in that the color former and the developer are selected so that when the reflectance of the color former-developer compound on the recording material is determined, it remains below a target curve determined with a function Hp=1.775*Ap22*10?61, where Hp is the reflectance percent and Ap the wavelength (nm) used in the bar code reader.