Abstract:
A perforated drum coating machine which can readily be set up so as to be suitable for the coating of either tablets or the like, or spheroids. The machine contains at least one securing means which is attachable to the perforated drum, and at least one mesh member consisting of suitable mesh which is edged with thin springy material, and a strip of deformable rubber or plastics material which is positioned against the inward facing part of the edge of the perforated part of the drum at two or more arcuate portions thereof. The or each securing means is adapted to engage with and secure, on the inside of the drum, two mesh member edges. The total area of the mesh member(s) is essentially the same as the area of the perforated part of the drum. The deformable strips are positioned between at least two mesh member edges and the said arcuate portions of the perforated drum. The edges of the mesh member(s), which are adjacent the deformable strips which are themselves adjacent the said arcuate portions, are slightly over-long (i.e. in a circumferential sense), and they are sprung in an outward direction so as to be a tight fit against the deformable strips and, through said strips, against the arcuate edges of the perforated part of the drum.
Abstract:
An improved electrostatically assisted coating method and apparatus that includes the placement of an electrostatic charge, of a predetermined magnitude, on material to be coated, such as by dipole orientation, before and/or remote from the location where the coating is actually applied to said material by a coating applicator.
Abstract:
La présente invention a pour objet un dispositif pour appliquer un revêtement sur une surface immergée. Ce dispositif comprend un élément d'application (6) comportant une plaque support (10) et une enveloppe étanche déformable (8) munie de poils (16) sur sa face externe (14), des ressorts (20) étant fixés sur la face interne de la plaque (10) et exerçant une pression sur la face interne (12) de l'enveloppe (8), l'élément d'application (6) étant relié à un support rigide (28) au moyen d'un ensemble de biellettes articulées (30, 36) dont l'une au moins est reliée au support (28) par des moyens élastiques (40) afin que l'élément (6) soit appliqué sur la surface (2) avec une pression suffisante. Application à la peinture des coques de navires.
Abstract:
Excessive heat-generating current levels produced in semiconductive materials by electrostatically assisted coating apparatus employed to, for example, improve the uniformity of a coating applied to such materials are avoided by passing an auxiliary current through said semi-conductive materials in the same region and in a direction opposite to that of the current produced by said electrostatically assisted coating apparatus such that the difference between the said current produced by said electrostatically assisted coating apparatus and the said auxiliary current is less than or equal to a predetermined value.
Abstract:
Method for coating an edge border of a substrate in which one deposits a series of adjoining and cohesive threads or strips of extrudable plastic material by means of an extruder nozzle onto the adjoining zone with a length greater than the breadth of the zone plus the thickness of the end edge, such that a thread or strip deposited on the one substrate surface spreads under the influence of the kinetic energy present in the extruder material via the edge until it reaches the substrate surface opposite, and device for carrying out this method.
Abstract:
A coating apparatus for applying a coating onto a surface of a moving web (Wa). The apparatus includes a backing member (12a) which defines a perforate surface (36) such that when the member (12a) is connected to a source of partial vacuum (38), the web (12a) is drawn towards the perforate surface (36) of the member (12a). A coating blade (20a) is disposed adjacent to the backing member (12a) such that the blade (20a) urges the web (Wa) towards the perforate surface (36). A permeable belt (40) extends around the backing member (12a) with the belt (40) being disposed between the web (Wa) and the backing member (12a) such that when the source of partial vacuum (38) is connected to the backing member (12a), air flows through the belt (40) and the perforate surface (36) for drawing the web (Wa) into close conformity with the belt (40). The belt (40) and the web (Wa) then move together in the same direction for inhibiting the buildup of deleterious material adjacent to the blade (20a) that would otherwise remain adjacent to the blade (20a) causing marking of the coating applied to the surface of the web (Wa) by the blade (20a).
Abstract:
e The invention is particularly useful for applying a layer of photoresist to the surface of a semiconductor wafer. It avoids the problems of prior art techniques and is characterized by holding the wafer (11) in an inverted position, contacting the inverted face (11a) of the wafer with a precisely metered amount of a flowable photoresist (21) and rotating the workpiece in its inverted position after it has contacted the photoresist to coat the wafer with a thin, uniform layer of the flowable material. The present invention is also directed to an apparatus for coating a wafer comprising, a spindle (10) holding the wafer (11) in an inverted manner so that the face of the wafer to be coated faces downwardly towards a liquid deposit of the coating material (21) which is supported on a nozzle (17) beneath the spindle, which spindle may be moved to permit the inverted slice to contact the liquid deposit, and means (14, 15, 16) for spinning the spindle in the inverted position to spread the coating material uniformly across the face of the spinning wafer.
Abstract:
Treating flexible sheet material, including paper, using vacuum guides adjacent to short-dwell applicators improved application of fluid treating composition, particularly at high speeds.
Abstract:
Liquid coatings are applied to cylindrical articles (26) such as plastic containers, in which each article during movement by a rotary transport is caused to spin about its cylindrical axis by a drive (45, 20) for the container holding rotatable chucks. A liquid coating is applied by an applicator (60, 61) to the cylindrical surface of the spinning container. A wiper (70) spreads the coating uniformly and a drier (80) dries the coating. The ratio of the speed of orbital movement of the containers and the rate and direction of spin of the containers is adjustably controllable.
Abstract:
An apparatus for coating the threads of articles such as fasteners, pipes, plugs, valves, fittings, etc., includes an indexing table for intermittently moving the articles along an arcuate path, rotatable article spindle assemblies on the table radially spaced apart an equal distance and being stopped at a dispensing station and at a wiping station spaced therefrom equal to such distance. A dispensing head at the dispensing station includes a nozzle for delivering a coating of the sealant onto the threads of a rotating article, and a wiper wheel at the wiping station wipes the coated threads and presses the coated sealant into the thread roots during rotation of the wheel which likewise rotates the coated articles.