Methods of curtain coating substrates are disclosed. In some embodiments, the methods include applying two or more liquid layers simultaneously to a substrate, wherein the multiple layers include a bottom liquid layer comprising a shear thinning liquid, and another liquid layer comprising a viscoelastic liquid. In some embodiments, the disclosed methods include formulating a bottom layer liquid comprising a shear thinning liquid, formulating another layer liquid comprising a viscoelastic liquid, pumping the bottom layer liquid and the other layer liquid through coating dies simultaneously and onto a moving substrate such that the bottom layer liquid impinges on the substrate thereby forming a bottom layer, and the other layer liquid forms another liquid layer above the bottom liquid layer. The inclusion of a bottom liquid layer comprising a shear thinning liquid and other layer comprising a viscoelastic liquid provides for enlargement of the curtain coating window.

A method and a device for the application of starch on a moving fiber web, especially on a packaging paper web such as a testliner or a corrugated medium web, include first applying starch to a first roll and/or a second roll and passing the fiber web through a treatment nip formed by the first roll and the second roll. At least one of the first or the second roll, preferably both rolls, have a hardness of 15 P&J (Pusey & Jones) or lower, preferably 5 P&J or lower and most preferably 1 P&J or lower. The starch is applied to the first roll and/or the second roll by a slot die and/or a slide die and then transferred to the fiber web in the treatment nip.

Apparatus for blending and applying plural substances including aggregate onto an environmental substrate is shown and described. The apparatus includes optionally a single power plant, plural pumps each fed by a respective hopper, and a blender blending pumped materials together. Dispensing ratios of the two pumps are mutually adjustable. An onboard air compressor delivers compressed air for atomizing blended materials as they are dispensed with the aggregate. Because materials may be curable or hardenable, flushing is enabled. The apparatus may be a free standing wheeled device.

A curtain application unit for applying a liquid or pasty application medium to at least one surface of a moving material web, in particular a fibrous web, includes an application head having at least one separation edge extending substantially over the width of the application head. The application medium exits the application head in the form of a free-falling curtain at the separation edge. At least one rinsing device is used to apply a flowing gaseous rinsing medium to the at least one separation edge, and at least one blocking device is suitable for keeping air movements of the ambient air away from the curtain. A method for coating a moving material web is also provided.

An apparatus for coating a food product with a batter, includes a frame having a conveyor belt mounted on a rotatably driveable belt support member. The coating apparatus has a batter pump for pumping batter from a batter container towards an upper applicator positioned over the conveyor belt to form a stream of batter flow from the applicator to the conveyor belt to provide batter to an upper surface of the food product. The front roller is positioned at the food product entry section to provide a layer of batter on the conveyor belt at the entry section by a thrust on the batter towards the entry section by the front roller and/or the conveyor belt. The coating apparatus comprises a batter overflow device positioned at the entry section and is mounted between the transport run and the return run of the conveyor belt.

Apparatus for blending and applying plural substances including aggregate onto an environmental substrate is shown and described. The apparatus includes optionally a single power plant, plural pumps each fed by a respective hopper, and a blender blending pumped materials together. Dispensing ratios of the two pumps are mutually adjustable. An onboard air compressor delivers compressed air for atomizing blended materials as they are dispensed with the aggregate. Because materials may be curable or hardenable, flushing is enabled. The apparatus may be a free standing wheeled device.

A method and a device for the application of starch on a moving fiber web, especially on a packaging paper web such as a testliner or a corrugated medium web, include first applying starch to a first roll and/or a second roll and passing the fiber web through a treatment nip formed by the first roll and the second roll. At least one of the first or the second roll, preferably both rolls, have a hardness of 15 P&J (Pusey & Jones) or lower, preferably 5 P&J or lower and most preferably 1 P&J or lower. The starch is applied to the first roll and/or the second roll by a slot die and/or a slide die and then transferred to the fiber web in the treatment nip.

To provide surface treatment that can reduce occurrence of defects caused by incorporation of dust. Rollers 40 are rotatably fixed to rotating shafts 72 provided to protrude from lateral protective walls 49. The lateral protective walls 49 are fixed perpendicularly to lower protective walls 47 fixed to outer walls 39. Hanging plates 64 of a hanger 50 extend through a space 43 between both lower protective walls 47 and support clips 52. A liquid 41, such as water, is filled in spaces defined by the lateral protective walls 49, the lower protective walls 47, and the outer walls 39. The liquid 41 is filled to cover about half of each rotating shaft 72. Thus, fine dust generated by a transferring mechanism is captured by the liquid 41 and prevented from drifting from the space 34 toward the substrate 54.

Methods of curtain coating substrates are disclosed. In some embodiments, the methods include applying two or more liquid layers simultaneously to a substrate, wherein the multiple layers include a bottom liquid layer comprising a shear thinning liquid, and another liquid layer comprising a viscoelastic liquid. In some embodiments, the disclosed methods include formulating a bottom layer liquid comprising a shear thinning liquid, formulating another layer liquid comprising a viscoelastic liquid, pumping the bottom layer liquid and the other layer liquid through coating dies simultaneously and onto a moving substrate such that the bottom layer liquid impinges on the substrate thereby forming a bottom layer, and the other layer liquid forms another liquid layer above the bottom liquid layer. The inclusion of a bottom liquid layer comprising a shear thinning liquid and other layer comprising a viscoelastic liquid provides for enlargement of the curtain coating window.

An apparatus for coating a food product with a batter, comprises a frame having a conveyor belt mounted on a rotatably driveable belt support member. The coating apparatus comprises a batter pump for pumping batter from a batter container towards an upper applicator positioned over the conveyor belt to form a stream of batter flow from the applicator means to the conveyor belt to provide batter to an upper surface of the food product. The front roller is positioned at the food product entry section to provide a layer of batter on the conveyor belt at the entry section by a thrust on the batter towards the entry section by the front roller and/or the conveyor belt. The coating apparatus comprises a batter overflow device positioned at the entry section and is mounted between the transport run and the return run of the conveyor belt.