Abstract:
In an application method and an application device, a liquid (3) to be applied is supplied to form a liquid reservoir (8) immediately upstream of the contact portion between a rotating bar (1) and a continuously-moving web (2) so as to apply the liquid (3) to the web (2). The effective application length of the bar (1) is set to be shorter than the width of the web (2) so as to prevent the liquid (3) from flying away and suction openings (11) are provided at both the end faces (10) of the effective application length part of the bar (1) so as to suck the excess portion of the liquid (3) along the end faces (10) of the bar (1).
Abstract:
Vorgeschlagen ist eine Vorrichtung zum Auftragen einer Schicht aus einer flißfähigen, feinkeramischen Masse auf einen festen, kontinuierlich bewegten Träger. Über letzterem ist dabei ein Vorratsraum für die Masse vorgesehen, dessen in Bewegungsrichtung des Trägers vordere Begrenzung durch eine rotierend angetriebene Walze und dessen hintere und seitliche Begrenzungen durch Wände gebildet sind. Die Walze und die hintere Wand des Vorratsraumes sind dabei so ausgebildet und relativ zueinander bewegbar, daß die Masse in Form portionierter, kontinuierlich in gleichen Abständen aufeinanderfolgenden Mengen aus dem Vorratsraum abgeb bar und auf den Träger auftragbar ist. Die Abstände der aufeinanderfolgenden Portionen sind so bemessen, daß diese auf dem Träger zur Bildung einer dann durchgehenden Schicht ineinander verfließen können.
Abstract:
A method for forming a uniform, extremely thin film on the surface of plastics molded articles, films, sheets, synthetic paper, fibers, metal, and other objects, said film containing an anti-static agent, anti-fogging agent, anti-corrosive agent, mildewproofing agent, and the like. In the method a homogenous solution or emulsion is prepared by dissolving a surfactant and agents in a solvent such as water with the aid of ultrasonic energy or like, and the solution is made into an aerosol of fine particles by means of cavitation. The aerosol is brought into contact with an object, whereby the fine particles of aerosol are deposited on the object and a thin film of the solution is formed on the surface of the object due to the difference in surface tension between the surfactant and the object. After evaporation of the solvent, the agents are left on the surface of the object in the form of an extremely thin film. The specification discloses also apparatus for producing such an aerosol, selecting aerosol particles, and bringing the aerosol into contact with the surface of an object.
Abstract:
Device for applying a film to a support, comprising: a) an impregnation roller intended to collect the product to be applied and which is provided with a plurality of microdimples in its external surface; b) a scrubbing member (4) which is in tangential contact with the impregnation roller (3) and which leaves on said roller only the product contained in the microdimples; c) a transport roller (5) which is in contact with the impregnation roller (3) and to which adheres on its surface the product contained in the microdimples, in the form of droplets (21); and d) a squeezer roller (6) which presses the support (7) against the transport roller (5) causing the transfer of the product droplets (4) from the transport roller (5) to the support and simultaneously the expansion of said droplets, thereby producing a uniform film of product on the support (7).
Abstract:
A system of reverse gravure kiss coating of a fluid coating material (10) on a web (18) of material includes contacting a surface of the web with a gravure roller (14) while the web is unsupported on the rear surface (30). After the coating material is applied, the rear surface (30) is contacted with an output roller (32) downstream of the gravure roller (14). The output roller (32) can be driven and the web (18) wraps around the output roller (32). The tension at a portion of the web (18) that contacts the gravure roller (14) can be isolated from the tension at a portion of the web (18) that is upstream of the gravure roller (14) using a nip roller (34) to nip the web to the output roller (32) upstream of the gravure roller (14).
Abstract:
A roll coating system for coating strip metal having a plurality of coating head rolls (30, 34, 36) mounted on support sleds (42a, 42b, 42c) capable of linear translation along a single rail (50). Precision linear actuators (82) are located between each support sled and between one of the sleds and a fourth sled (44). A splice traverse mechanism (58) actuated by a piston/cylinder (60) displaces the fourth sled. Each of the rolls can be independently displaced or the entire head can be displaced by the splice traverse mechanism. Force measurement sensors (104) are located in the support sleds for an accurate measurement of nip pressures between the respective rolls. The elastic response of the support sleds may be varied to alter the natural resonant frequency of the coating system. The movement of a pan lift mechanism (39) is coupled to the movement of the pickup roll (36) so as to eliminate the chance for collision therebetween. The movement of a lift roll (212) in a double coating environment, or the movement of a pass line roll (262) in a U-wrap environment may be coupled with the movement of the roll coating head.
Abstract:
In order to apply a product to a support (10) a transfer cylinder (1) with a checkered surface is used with an applicator cylinder (3). The applicator cylinder (3) consists at least in part of a magnetizable material, is not mounted on an axle, rotates on the transfer cylinder (1) and can move in relation to the point of application.
Abstract:
Device for the application of a coating composition on a travelling web (17) comprising a transfer roll (5), a support roll (3) cooperating with the transfer roll (5), the travelling web being fed in a nip between said rolls, further comprising a gravure roll (7) intended for the transfer of an adapted quantity of the coating composition onto the transfer roll (5), and means for passing of the web through said nip, characterized by blade means (11, 13) for the removal of excess of coating composition from the gravure roll (7), said blade means being arranged in trailing position in relation to the moving surface of the gravure roll (7).
Abstract:
The invention has its object to ensure undistorted stable running and prevent coating unevenness produced by generation of wrinkles and lines over an entire base sheet (3). An integral moving frame (31) mounts thereto a first guide roll (7), a second guide roll (8) and a B roll (2), and a feed roll (9) is provided substantially vertically below the second guide roll (8) on an upstream side of the second guide roll (8) along the length of the base sheet (3). A distance from the feed roll (9) to the second guide roll (8) ranges from 90 to 210 times the moving distance of the B roll (2) upon the movement of the B roll (2) away from a C roll (1).
Abstract:
A coating device has a coating roller (1) which forms a coating gap (10) with the counter-roller (4) for guiding the web of material (C). A preferably flexible guiding wall (2) having approximately the same shape as the casing of the counter-roller (4) or a shape adapted to the shape of the latter, or an automatically adaptable shape by Coanda effect, is arranged after the coating gap (10) or after the pressure chamber (8) formed in that spot between the coating roller (1) and the counter-roller (4). The guiding wall (2) forms a narrow gap (7) on the web of material, at such a small distance that any formation of drops or streaks in the coated material due to the centrifugal force is reliably excluded. A final dosing spot constituted by a dosing blade (6) is located downstream of the guiding wall.