摘要:
A coating method and apparatus using an extrusion head to apply a liquid film to a running web. The thickness of the film is measured at two transverse points and a roller conveying the web is tilted to correct any difference. The amount of tilt per roller with a roller bearing span of 750 mm is 0.5 to 20 mm, preferably 0.5 to 15 mm.
摘要:
A coating method and an extrusion-type coating head in which turbulence at the junction between two flows of coating materials is prevented to provide multi-layer simultaneous coating over a wide range of coating rates and with a good coating quality. An intermediate block is sandwiched between a rear block defining a back edge and a front block defining a doctor edge. Two coating flows pass through slits formed on either side of the intermediate block, joining at the top end of the intermediate block and flowing together into a short slot extending between the end of the intermediate block and the outlet of the head.
摘要:
A method for coating a running support with a coating solution, such as in the production of a magnetic recording medium, in which spreading of the coating solution into edge portions of the support not intended to be coated with the coating solution is prevented, hence providing a coating layer uniform in thickness and with good surface characteristics. Immediately before application of the coating solution to the support, a solvent is applied to regions of the support which are not to be coated with the coating solution and which are located on both sides of the coating region to be coated with the coating solution. In accordance with the invention, the solubility parameter of the solvent is made different from that of a solvent contained in the coating solution by at least 1.2 at a temperature of 25.degree. C.
摘要:
A dual-coating method for use with a magnetic tape. A first coating solution is applied to a travelling support in an amount not exceeding 60 ml/m.sup.2. Within 5 seconds, a extrusion head pressed against the unsupported but tensioned moving support applies a second coating solution in an amount not exceeding 50 ml/m.sup.2.
摘要翻译:一种用于磁带的双重涂覆方法。 第一涂布溶液以不超过60ml / m 2的量施加到行进支架上。 在5秒钟内,压靠未支撑但张紧的移动支架的挤压头施加不超过50ml / m2的第二涂层溶液。
摘要:
A method for removing dirt from a web in which a blow-off nozzle is provided extending over the width of a web. An edge of the nozzle at an end thereof is positioned close to one surface of the web. Air is blown through the nozzle while said web is being run past said nozzle so that deposits are removed from a surface of the web with the edge while the web is maintained in a floating state separated from the nozzle.
摘要:
A coating material and apparatus in which the edge portions of the web being coated are supported off the edge portions of the coating head. In one embodiment, recesses are formed in the edge portions of the coating head, while in another embodiment a fluid is jetted towards the edge portions of the web. With the invention, scratching and the like of the edge portions of the web are eliminated, and the web is coating to a uniform thickness in the width direction thereof.
摘要:
A coating method and an extrusion-type coating head in which turbulence at the junction between two flows of coating materials is prevented to provide multi-layer simultaneous coating over a wide range of coating rates and with a good coating quality. An intermediate block is sandwiched betwen a rear block defining a back edge and a front block defining a doctor edge. Two coating flows pass through slits formed on either side of the intermediate block, joining at the top end of the intermediate block and flowing together into a short slot extending between the end of the intermediate block and the outlet of the head.
摘要:
An extrusion type coating head having a back edge, and two doctor edges arranged along the direction of a moving web with slots therebetween for coating solutions to be applied to the web. Both of the doctor edges are convex toward the web.
摘要:
A method of applying a liquid to a moving web while pushing an extrusion application head to the moving web without supporting the moving web on the reverse side thereof. The application is performed while the accumulation of the liquid to be applied to the moving web is maintained by (a) the moving web and (b) an edge of the back blade of the extrusion application head, the edge being defined by the intersection of (1) a first surface of the back blade which faces the front blade and which is nearest the web, and (2) a second surface of the back blade which is more remote from the front blade than the first surface and, wherein the pressure of the liquid of the accumulation located between the web and the outlet portion of the slit of the extrusion application head is set within a range from 0.2 kg/cm.sup.2 gauge to 0.8 kg/cm.sup.2 gauge per 50 cm of width of applied liquid.
摘要翻译:一种在将挤出施加头推向移动幅材的同时将液体施加到移动幅材上的方法,而不在其反面上支撑移动幅材。 当通过(a)移动幅材和(b)挤出施加头的后叶片的边缘来维持施加到移动幅材上的液体的积聚时,执行应用,边缘由 (1)后刀片的面向前刀片并且最靠近腹板的第一表面,和(2)后刀片的比第一表面更远离前刀片的第二表面,并且其中压力 位于幅材和挤出施加头的狭缝的出口部分之间的积聚液的液体被设定在每50cm宽的施加液体的0.2kg / cm 2表压至0.8kg / cm2表压的范围内。
摘要:
An application device for applying a liquid such as a magnetic coating liquid to the surface of a continuously moving web in which the amount of chipping of the surface portions of the outlet portion of the coating head thereof, and hence the amount of streaking in the applied layer of liquid, are remarkably reduced. The outlet portion of the application head is made of a very hard alloy, preferably tungsten carbide, containing crystal grains of a carbide 5 .mu.m or less in mean diameter conjoined to each other by a metal, preferably cobalt in an amount of 12% or less.