摘要:
Methods of altering charge on a dielectric material involve application of an at least weakly conductive liquid to at least a portion of the dielectric material. The liquid is then at least partially removed from the dielectric material leaving a substantially uniform electrostatic charge on at least the portion of the dielectric material. Some methods provide a dielectric material that is both net neutral and completely neutral. Other methods generate a charge pattern that is used for subsequent processing.
摘要:
A method for forming a coating layer is provided according to the invention. The method includes steps of assembling a die coater comprising a first die block (12), a second die block (14), and a plurality of fasteners (40) holding the first die block and the second die block together, wherein each of the plurality of fasteners provides a compression force between the first die block and the second die block, and the first die block and the second die block are constructed to provide an internal manifold (16) and a coating slot (18), and extruding a coating material through the internal manifold and the coating slot. The coating slot can be adjusted to provide a more uniform coating slot along the length of the coating slot by adjusting the compression force of the fasteners, utilizing an offset bracket (80), adjusting the die bolt locations, adjusting the die overhang, providing a non-uniform shim (30), or a combination thereof. A die coater is additionally described.
摘要:
Methods and apparatus (40) to neutralize the charge on a moving web (42) by splitting the field present on the web (42). One portion of the field is removed by a grounded element (55a, 55) proximate to, and optionally contacting, one side of the web (42). Proximate the opposite side of the web, the apparatus includes an ion source (57a, 57b, 57c), which provides ions to the web (42) to neutralize the charge remaining on the web (42), and a second grounded element (50a, 50b, 50c) positioned between the ion source (57a, 57b,57c) and the web (42). The methods provide a web (42) that is net neutralized and is also dual-side or bipolar neutralized.
摘要:
The invention is a method of forming extrudate having substantially uniform thickness. A shim is formed which has a thickness variation of less than or equal to about 0.5 mil (13 microns) total indicated runout. This shim is disposed between a first die portion having a first surface and a second die portion having a second surface. A slot is formed between the first surface and the second surface. The slot has a height dimension substantially the same as the shim thickness. Flowable material is extruded through the slot.
摘要:
The invention provides methods of reducing visible defects in curable coating compositions. In one embodiment, the method includes coating a curable composition onto a substrate, removing solvent from the curable composition, and heating the dried curable composition to a temperature at which the curable coating exhibits leveling flow. In another embodiment, the curable composition is coated onto a substrate, and then is heated to a temperature at which the curable coating exhibits leveling flow.
摘要:
A low fringing film coating includes a transparent polymeric layer having a surface, and a plurality of projections extending away from the surface. The projections have a mean height of 0.05 to 1 μm and a mean distance between projections of 0.5 to 2 mm. The coating can be produced by coating a polymeric composition onto a substrate. The polymeric composition includes a polymeric material, a good solvent for the polymeric material and a poor solvent or the polymeric material. The solvents are at least partially evaporated to form a low fringing transparent polymeric layer.
摘要:
A method and apparatus for producing microporous films. The method utilizes a casting surface and a condensing surface. The condensing surface is spaced from the casting surface to form a gap. The distance between the surfaces forming the gap is relatively small and is preferably less than 3 cm. A material, capable of forming microporous films through thermally induced phase separation processes, is cast onto the casting surface, preferably through conventional extrusion practices. The material contains at least one evaporative component that generally flashes off upon formation of the microporous material and condenses on the condensing surface.
摘要:
A vapor collection method and apparatus capable of capturing vapor compositions without substantial dilution. The method and apparatus utilize a material that has a surface with an adjacent gas phase. A chamber is positioned in close proximity to a surface of the material. The position of the chamber creates a relatively small gap between the surface of the material and the chamber. The adjacent gas phase between the chamber and the surface define a region possessing an amount of mass. At least a portion of the mass is drawn through the region by induced flow. The utilization of a small gap limits the flow of mass that is external to the chamber from being swept through the chamber by induced flow.
摘要:
A method of preparing a surface on a die coater to improve the uniformity of the coating layer on the substrate. A surface of the die block is machined. The die block is then positioned on a measuring surface in a free state so that the machined surface being measured is substantially vertical. The vertical orientation of the die block substantially removes the effect of gravity on any residual stress during measuring. The steps of machining, positioning, and measuring the die block are repeated until the desired total indicated run-out is achieved. The positioning step may also include interposing at least two point supports between the die block and the measuring surface. In another embodiment, the die blocks are positioned in a reference state or a production state for measuring.