Abstract:
An apparatus and method of flowing a fluid onto an incline planar surface across the entire with of the slot has a slot capillary number less than 0.04. The slot exit gap S is selected to be less than ##EQU1## where S is the slot gap in cm, .mu. is the fluid viscosity measured in poise, .rho. is the liquid density measured in gm/cm.sup.3, .sigma. is the liquid surface tension measured in dyne/cm, and N.sub.re is the Reynolds number as defined by N.sub.re =4M/.mu., where M is the liquid flow rate per unit of width measured in gm/sec-cm. The expression for a is defined as 0.981+0.3406 log N.sub.re.sup.0.3406. The fluid is flowed through a slot exit.
Abstract:
Composite coatings are provided having a variable thickness and a gradient coloration in the cross-web direction using a premetered extrusion coating process wherein a pigmented coating composition and a non-pigmented coating composition are simultaneously extruded onto a carrier film. The composite coatings are useful in preparing laminated structures such as automobile windshields with a colored gradient band.
Abstract:
A process for producing a double-layer film on a flat substrate by reactive casting employing two kinds of reaction-curable resin raw material mixtures substantially free from a solvent, which comprises casting onto the substrate a first unreacted liquid raw material mixture for the first layer, then casting onto the first layer a second unreacted liquid raw material mixture for the second layer while the first raw material mixture still retains its fluidity, and thereafter curing by reaction the two layers simultaneously.
Abstract:
A process of producing a high gloss oxidizable extrusion coated polyethylene is provided. This process entails extrusion coating a low density polyethylene of narrow molecular weight distribution having a low melt index, a low swell ratio, and a polydispersity index below 9.
Abstract:
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.
Abstract:
Substrates are coated by a process which comprises co-extruding onto the substrate, e.g. aluminium foil, a layer of an olefin terpolymer and a layer of polypropylene, the olefin terpolymer being adjacent to the substrate and the polypropylene being adjacent to the olefin terpolymer. The olefin terpolymer is a terpolymer of an olefin, e.g. ethylene, an unsaturated carboxylic acid or anhydride, e.g. acrylic acid, and an unsaturated ester, e.g. methyl acrylate, in which the amount of carboxylic acid or anhydride groups in the terpolymer is at least 3 mole % and the amount of ester groups in the terpolymer is at least 3 mole %.
Abstract:
A method of forming a multilayer coated film comprising applying two or more nonaqueous layers to a continuously traveling flexible web, wherein at least one of the two or more coated layers comprises a coating composition containing an electron beam hardenable resin, and at least one of the two or more coated layers has a viscosity of about 100 cps or more, and irradiating the two or more coated layers with electron beams to harden the coated layers or increase the viscosity thereof, and thereafter drying the coated layers is disclosed.
Abstract:
A process is dislosed for producing a support suitable for use in the formation of polyurethane films, the support comprising a base and a releasing layer on the base comprising a polymeric mixture of 95 to 65 parts by weight of polypropylene and 5 to 35 parts by weight of polyethylene, which process comprises extrusion coating the base with said mixture through a T-die to form the releasing layer on the base, the temperature of the mixture as extruded through the T-die being controlled below 300.degree. C.
Abstract:
In a method for coating a surface with a layer the surface is first subjected to vacuum in a vacuum zone (V) sealed against the surface, whereupon liquid for forming the layer is supplied to the surface in a sealed pressure zone (P) following the vacuum zone. The supplied liquid is then spread out in a controlled manner, preferably by the sealing (13) terminating the pressure zone. FIG. 1.
Abstract:
Biaxially oriented polypropylene films are extrusion coated with an ethylene-vinyl acetate copolymer coating to yield a coated film product exhibiting heat-seals which are peelable and which exhibit good heat-seal strengths.