Abrégé

In a method for applying a material to a moving belt (4) transporting a product, an air-vapour mixture is supplied to at least one nozzle (13) via which the material is applied to the belt (4) in an application zone (32), by means of the air-vapour mixture as a blowing agent. Excess air-vapour mixture and excess material are removed from the application zone (32). The aim of the invention is to improve the energy efficiency of such a method. To this end, at least part of the excess air-vapour mixture removed from the application zone (32) is recycled and supplied back to the nozzle (13). The invention further relates to a device (1) for carrying out the above-mentioned method.

Classes IPC  ?

• D21H 23/50 - Pulvérisation ou projection
• D21H 17/28 - Amidon
• D21H 19/54 - Amidon
• D21H 23/00 - Procédés ou appareils pour l'addition de matériaux à la pâte ou au papier
• D21H 23/20 - Appareillages à cet effet
• D21H 23/26 - Addition au papier formé durant la fabrication du papier par sélection du point d'addition ou de la teneur en eau du papier
• D21H 23/44 - Traitement par un gaz ou une vapeur

Abrégé

A process fluid including a desired coating component, such as fluid starch, a surface sizing agent, a wax, plastic, or the like is applied by a spray apparatus to the surface of at least one of a pair of nip-forming rotating rolls from which it is transferred by contact to a moving web. Where two rolls are used, each roll can be supplied with the same or a differing coating material. At least one direct spray apparatus is located upstream of the nip forming roll pair and delivers a second process fluid, which may be the same or different from the first, to at least one surface of the web. This combination of indirect application of web coating materials from spray to roll to web, in combination with a direct spray system, offers numerous advantages including the ability to apply higher amounts of coating component than previously possible, to selectively optimize properties of each web surface, and apply coatings which have differing temperature sensitivities, utilizing spray configurations which may enhance sheet stability and reduce web breaks.

Classes IPC  ?

• B05C 1/08 - Appareillages dans lesquels un liquide ou autre matériau fluide est appliqué à la surface de l'ouvrage par contact avec un élément portant le liquide ou autre matériau fluide, p. ex. un élément poreux imprégné du liquide à appliquer sous forme de revêtement pour appliquer un liquide ou autre matériau fluide à un ouvrage de longueur indéfinie en utilisant un rouleau
• B05C 1/00 - Appareillages dans lesquels un liquide ou autre matériau fluide est appliqué à la surface de l'ouvrage par contact avec un élément portant le liquide ou autre matériau fluide, p. ex. un élément poreux imprégné du liquide à appliquer sous forme de revêtement
• B05B 3/00 - Appareillages de pulvérisation ou d'arrosage avec des éléments de sortie mobiles ou des éléments déflecteurs mobiles

Abrégé

A nozzle assembly with a self-cleaning face is provided, having a nozzle body with a liquid flow path defined therethrough with an inlet and a spray outlet. The nozzle body is mounted in a carrier body, and an annular gas flow channel is located about the nozzle body with a gas discharge outlet defined around the spray outlet. A porous surface is located about the annular gas flow channel at the gas discharge outlet. A radiused surface is formed in the carrier body at the air discharge outlet. A pathway is in communication with the porous surface and adapted to provide a low velocity fluid discharge from the porous surface. A spray device and method are also provided using the nozzle assembly with the self-cleaning face. An adaptor for retrofitting an existing nozzle is also provided.

Classes IPC  ?

• B05B 7/08 - Pistolets pulvérisateursAppareillages pour l'évacuation avec des orifices de sortie séparés, p. ex. pour former des jets parallèles, pour former des jets croisés
• B05B 7/10 - Pistolets pulvérisateursAppareillages pour l'évacuation produisant une turbulence à la sortie
• B05B 15/02 - Systèmes ou dispositifs pour nettoyer des orifices d'évacuation