Method for applying adhesive to substrate, substrate, coating device, method for producing laminated object, and laminated object

A method for applying a hot melt adhesive in a melted state to a surface of a substrate, the method comprising the steps of:

• preparing a hot melt adhesive, which is a urethane reactive hot melt adhesive and melts in a temperature range of 100 to 130° C., and a coating equipment including plural applicator roller stages which form an adhesive layer by laminating plural coatings of a hot melt adhesive;
• conveying the substrate which is a wood board at a predetermined speed;
• rotating applicator rollers of the applicator roller stages in the direction, to which the substrate is moved on a conveyer, to cover the substrate with the hot melt adhesive in a melted state, wherein
• at least one applicator roller has a surface made of a material which reduces slipping and the hot melt adhesive is supplied from a pool of the hot melt adhesive existing in a valley formed by the applicator roller and a metering roller via an interface of the rollers, and the applicator roller is rotated at a circumferential speed at least 20% slower or at least 20% faster than the predetermined speed of the substrate to cause the roller to slip;
• and
• contacting the upper surface of the substrate from above with the applicator rollers to form the adhesive layer on substantially the entirely of the upper surface of the substrate with the hot melt adhesive.