A dielectric welding film capable of achieving a tight welding through a short period of dielectric heating, and a welding method using the dielectric welding film are provided. The dielectric welding film is configured to weld a pair of adherends of the same material or different materials through dielectric heating, the dielectric welding film including a thermoplastic resin as an A component and a dielectric filler as a B component and satisfying the conditions (i) and (ii): (i) a melting point or softening point measured in accordance with JIS K 7121 (1987) is in a range from 80 to 200 degrees C.; and (ii) heat of fusion measured in accordance with JIS K 7121 (1987) is in a range from 1 to 80 J/g.

The invention utilizes swelling and fusion effects of graphene oxide in a solvent to implement cross-linked bonding of a graphene material itself and materials such as polymers, metal, paper, glass, carbon materials, and ceramics. The present invention not only overcomes the shortcoming in traditional adhesives of residual formaldehyde, but also has short drying time, high bonding strength and high corrosion resistance. The present invention is widely applied in the fields of aviation, aerospace, automobiles, machinery, construction, chemical, light industry, electronics, electrical appliances, and daily life, etc.

The invention utilizes swelling and fusion effects of graphene oxide in a solvent to implement cross-linked bonding of a graphene material itself and materials such as polymers, metal, paper, glass, carbon materials, and ceramics. The present invention not only overcomes the shortcoming in traditional adhesives of residual formaldehyde, but also has short drying time, high bonding strength and high corrosion resistance. The present invention is widely applied in the fields of aviation, aerospace, automobiles, machinery, construction, chemical, light industry, electronics, electrical appliances, and daily life, etc.

In a method for producing a lamination stack for rotors and/or stators of electric motors or generators, laminations are punched from electrical steel, a light-activated adhesive is applied to at least one side of the laminations, respectively, and the adhesive is irradiated and activated with a light of a required wavelength immediately before the adhesive exits from an application unit. The laminations are then stacked to a lamination stack. An adhesive application device for carrying out the method has at least one application unit with at least one valve for discharging an adhesive. At least one radiation source is arranged in a region of the valve and emits a radiation and directs the radiation to the adhesive provided in the region of the at least one valve.

In a method for producing a lamination stack for rotors and/or stators of electric motors or generators, laminations are punched from electrical steel, a light-activated adhesive is applied to at least one side of the laminations, respectively, and the adhesive is irradiated and activated with a light of a required wavelength immediately before the adhesive exits from an application unit. The laminations are then stacked to a lamination stack. An adhesive application device for carrying out the method has at least one application unit with at least one valve for discharging an adhesive. At least one radiation source is arranged in a region of the valve and emits a radiation and directs the radiation to the adhesive provided in the region of the at least one valve.

A system including two pre-fixed substrates, wherein a first substrate and a second substrate. Each of the substrates has an opening in an overlap region, and an adhesive is arranged between the overlap regions, wherein the adhesive connects the two substrates together and is arranged at least partly in the openings. The adhesive is locally cured in the region of the openings. A cured sub-region of the adhesive extends from the first opening into the second opening, and a second sub-region of the adhesive is not cured.

A system including two pre-fixed substrates, wherein a first substrate and a second substrate. Each of the substrates has an opening in an overlap region, and an adhesive is arranged between the overlap regions, wherein the adhesive connects the two substrates together and is arranged at least partly in the openings. The adhesive is locally cured in the region of the openings. A cured sub-region of the adhesive extends from the first opening into the second opening, and a second sub-region of the adhesive is not cured.

Described herein is a moisture-curing polyurethane hot-melt adhesive including at least 80% by weight, based on a total weight of the moisture-curing polyurethane hot-melt adhesive, of isocyanate-terminated prepolymer obtainable by mixing diisocyanate (a) with compounds having at least two isocyanate-reactive groups (b) and reacting the mixture to form the isocyanate-terminated prepolymer, where the compounds having at least two isocyanate-reactive groups (b) include at least one polylactide (b1) obtainable by reacting lactide with a linear difunctional starter molecule having 2 to 20 carbon atoms and the isocyanate content of the isocyanate-terminated prepolymer is 1 to 5% by weight. Also described herein is a process for producing such a moisture-curing polyurethane hot-melt adhesive and a method of using the moisture-curing polyurethane hot-melt adhesive in bonding of substrates.

Described herein is a moisture-curing polyurethane hot-melt adhesive including at least 80% by weight, based on a total weight of the moisture-curing polyurethane hot-melt adhesive, of isocyanate-terminated prepolymer obtainable by mixing diisocyanate (a) with compounds having at least two isocyanate-reactive groups (b) and reacting the mixture to form the isocyanate-terminated prepolymer, where the compounds having at least two isocyanate-reactive groups (b) include at least one polylactide (b1) obtainable by reacting lactide with a linear difunctional starter molecule having 2 to 20 carbon atoms and the isocyanate content of the isocyanate-terminated prepolymer is 1 to 5% by weight. Also described herein is a process for producing such a moisture-curing polyurethane hot-melt adhesive and a method of using the moisture-curing polyurethane hot-melt adhesive in bonding of substrates.

Provided is a repair sheet for a mosquito window screen, including: a grid sheet (100); an adhesive layer (120) provided on the grid sheet (100); and a release liner (140) provided on the adhesive layer (120), wherein through-holes (110) are formed through the grid sheet (100) and the adhesive layer (120), wherein the release liner (140) is provided over the adhesive layer (120) and serves for a user to cut the repair sheet in a desired size and shape.