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7504034 |
Hollow fiber membrane and method of producing the same
A method of producing a hollow fiber membrane includes discharging a polyvinylidene fluoride solution comprising a polyvinylidene fluoride resin and a poor solvent at a temperature above a phase...
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6733718 |
Method of manufacturing a tubular member made of synthetic material, and a tube and a sheath manufactured by the method
The invention relates to a method of manufacturing a tubular member made of synthetic material, the method being of the type in which the tubular member is extruded. In the method, during extrusion...
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6521025 |
Super selective hollow fibre membranes
A hollow fibre membrane has an active layer ( 2 ) in which elongate polymer molecules ( 3 ) are longitudinally aligned essentially parallel to the extrusion direction to thereby define a plurality...
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6368547 |
Method for producing an extruded hollow plastic section
Apparatus and method for producing a hollow plastic section by extrusion through a die in a horizontal direction. The die has an inner mandrel which forms the cavity in the section. A first sealing...
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6214283 |
Method for treating an extruded plastic section and extrusion installation therefor
Method for treating an extruded plastic section having a hollow space and installation suitable for carrying out such a treatment. The installation includes an extruder which has a core for forming...
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6019934 |
Hollow extrusion using internal coolant
The process according to the invention for producing large-bore thick-walled pipes made of polyethylene comprises extruding the polymer composition out of an annular die 3 and subsequently cooling...
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6001288 |
Process for producing a hollow fiber membrane having a hydrophobic coating
A process for producing a hollow fiber membrane, a hollow fiber membrane, and a dialyzer of hollow fiber membrane type is provided. The hollow fiber membrane is highly biocompatible, and the...
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5853884 |
Method for producing unsupported fiber bundles for HME and other filtration applications
A method for forming a hollow fiber bundle unit for insertion into an assisted breathing device comprising spinning a hollow fiber or hollow fibers, collecting multiple fibers into a bundle,...
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RE35944 |
Method of everting a tube
In a tube eversion apparatus a first chamber in which the eversion pressure in developed is controllably sealed by a sphincter-type valve, the valve being in turn actuated by pressure developed in...
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5820934 |
Process for producing viscose hoses by precipitation
The present invention relates to a method for the production of a fiber-reinforced cellulose tube by continuous coating of a fibrous non-woven fabric with an alkaline viscose solution which is...
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5645872 |
Apparatus for processing food into tubular shape
A method and an apparatus for processing food into a tubular shape is provided in which a die for processing the food includes a guide plate having a material outlet and a cylindrical feed pin...
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5514312 |
Process for manufacturing a flexible tubular conduit having a jacket made of crosslinked polyethylene
The present invention relates to a flexible tubular conduit with a jacket or tube made of crosslinked polyethylene, specially crosslinked polyethylene, and a method for manufacturing the conduit. A...
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5505897 |
Method for forming a pipe
A method for manufacturing plastic pipe such that the pipe has apertures formed therein when the pipe is viewed in cross-section, comprising the steps of having hot plastic flow through a die and...
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5489406 |
Method of making polyvinylidene fluoride membrane
A method of making a porous polymeric material by heating a mixture comprising polyvinylidene fluoride and a solvent system initially comprising a first component that is a latent solvent for...
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5395570 |
Hollow fibre membrane extrusion
Extrusion of hollow membranes is improved by coextruding a coating fluid layer about the extrudate of heated polymer solution with its interior lumen forming extrudate. The coating fluid is...
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5296188 |
Methods for forming tubing utilizing suction and pneumatic pressure at the surface of the cooling plug
The invention concerns a cooling plug for sizing the interior surface of thermoplastic extruded pipe. Vacuum and/or pneumatic pressure is applied at the surface of the plug. The pneumatic pressure...
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5277851 |
Process of making a porous hollow fiber membrane
A method of making a porous polymeric material by heating a mixture of a thermoplastic polymer and a cationic or non-ionic surfactant having a hydrophilic-lipophilic balance range of 4.0 to 6.0 to...
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5261988 |
Making large-diameter pipe
A large-diameter plastic pipe is made by extruding from an extruding-nozzle assembly a hollow thermoplastic strip having an outer rectangular cross section and formed with longitudinally extending...
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5258160 |
Process and apparatus for producing elongated body of elastic modulus changing type
A process and apparatus for producing an elongated body changing in elastic modulus longitudinally thereof with use of polymers without resulting in variations in the outside and inside diameters...
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5225139 |
Process for the manufacturing of a mechanically conditioned thermoplastic film with biaxially recoverable stresses
A process of expanding plastics film is disclosed, together with an apparatus for performing that process, in which expansion of the plastics film is performed under the control of a liquid...
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5209883 |
Fabrication of fluoropolymer hollow fibers for asymmetric membranes
Asymmetric hollow fibers comprising a fluoropolymer, and a process for making such fibers. The hollow fibers are useful for making fluid separation membranes, especially gas separation membranes....
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5130065 |
Method of preparing polyacrylonitrile hollow threads with asymmetric pore structure
The process for production of polyacrylonitrile hollow threads with a stable, asymmetric pore structure by a dry-wet-spinning process with glycerine-based core liquids, definite draw and after...
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5106567 |
Method for producing a heat set article of thermoformed polyethylene terephthalate
As an article of manufacture, an ovenable shaped article formed of polyethylene terephthalate having a degree of crystallinity of at least 20%, said crystallinity being substantially uniform over...
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4975228 |
Process for preparing membranes from tetrahalobisphenol polycarbonates
A process for the preparation of a membrane comprising bisphenol-based polycabonate wherein at least 25 percent by weight of the bisphenol moieties are tetrahalogenated wherein the halogen is Cl or...
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4898924 |
Process for the production of biaxially oriented rigid rod heterocyclic liquid crystalline polymer films
A process is disclosed for the production of biaxially oriented liquid crystal films. The process includes: (i) forming an anisotropic dope from a polymerization solution of rigid rod...
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4871494 |
Process for forming asymmetric gas separation membranes having graded density skins
A process for forming high free volume, asymmetric gas separation membranes having graded density skins and macrovoid-free morphology from a solvent system comprising a Lewis acid, Lewis base, and...
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4867934 |
Production of hollow nylon fibers
A microporous nylon hollow fiber is prepared by extruding a nylon spinning solution through an annular slit of an orifice into a quench liquid while simultaneously introducing a core liquid into...
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4814120 |
Process for the preparation of collagen tubes
A process for preparing collagen tubes includes extruding an aqueous gel containing about 1.5% native collagen through a cylindrical spinneret equipped with a central concentric tube designed to...
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4750873 |
Device for the production of a tubular object
In a device for the extrusion of a tube the extruded tube (2) is guided by a piston (20) placed inside said tube (2) at a distance from the extrusion head (1) the cooling of the extruded tube (2)...
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4744932 |
Process for forming a skinless hollow fiber of a cellulose ester
A skinless hollow fiber of a cellulose ester material is formed by providing an aqueous coagulation bath having a tube-in-ring jet immersed therein and extruding a spinning solution comprising at...
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4708841 |
Pipe plug apparatus and method for its use
A pipe plug apparatus and method for its use are described herein. A pipe plug is provided which includes a first portion, and second and third portions which radially extend from the exterior...
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4663107 |
Method for the production of thermoplastic tubes
A method for the production of thermoplastic tubes comprising: (1) extruding the thermoplastic tube of which the interior surface in a molten state by a heating unit disposed within the area of a...
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4659532 |
Internal dusting of film tubes composed of thermoplastics
A process for providing film tubes with anti-blocking means in that the film tube is cooled internally by an aqueous suspension containing a suspended release agent directly after extrusion, the...
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4536365 |
Process for the manufacture of equally biaxially oriented film
Equally biaxially oriented film is produced by extruding liquified polymer in tubular form, orienting the tubular film in the radial direction only and then either (1) equally orienting the...
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4526526 |
Apparatus for internal cooling in extrusion of tube-shaped objects
A method and apparatus for internal cooling of extruded tube-shaped objects wherein liquid nitrogen is inserted into the tube and evaporated there out of contact with the tube on account of the...
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4457975 |
Tree resistant power cable
An improved method and apparatus for fabricating insulated cables, particularly polymeric insulated electrical power cables, resistant to the formation and growth of electrochemical trees is...
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4450131 |
Zero runout counter-rotating film extruder
This relates to a die assembly for extruding tubular casing films wherein there are counter-rotating die members. One of the die members is mounted for shifting relative to its base under the...
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4446095 |
Method for manufacturing heat shrinkable tubing
Long lengths of a heat-shrinkable sleeve for use in splicing electrical cables and the like are made in a continuous process. The sleeve is formed around a permeable core, and the core and sleeve...
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4430278 |
Process for increasing the permeability of plastic membrane
The regulated permeability of a thermoplastic membrane is modified by subjecting the thin membrane sheeting to warm to hot water, increasing the absorption of water in the membrane. The membrane is...
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4422999 |
Thermoforming tubular articles
Tubular thermoformed articles are manufactured from tubular blanks which are heated to the annealing temperature for a time sufficient to anneal the articles by flowing hot liquid therethrough...
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4389366 |
Process and device for cooling hollow synthetic material profiles
A hollow synthetic profile is cooled during extrusion by direct heat exchange through the introduction of under-cooled liquid nitrogen under a pressure of 2 to 8 bar into the hollow interior by...
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4354992 |
Electrochemical tree resistant power cable
An improved method and apparatus for fabricating insulated cables, particularly polymeric insulated electrical power cables, resistant to the formation and growth of electrochemical trees is...
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4342719 |
Method and apparatus for making textured bricks
Method for making extruded bricks having a textured handmade appearing face designed to form on outer building wall surface, comprising the steps of feeding a column of brick-forming clay mix into...
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4317794 |
Process for the continuous manufacture of fiber-reinforced cellulose hydrate tubing and equipment for carrying out the processes
Disclosed is a process for the continuous manufacture of fiber-reinforced tubing based on cellulose hydrate, comprising the steps of impregnating and coating fibrous tubing with an aqueous akaline...
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4271103 |
Plastic solar panel structure and method for making the same
A method and apparatus for extruding a radiant energy heat exchanging panel structure having a multiplicity of parallel passages extending longitudinally therethrough defined by a multiplicity of...
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4195054 |
Method and apparatus for the manufacture of fibrous casing
In the manufacture of fiber-reinforced cellulose casing wherein a paper tube is passed downwardly over a mandrel, impregnated with viscose and subjected to the action of a coagulating liquid to...
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4178968 |
Process for manufacturing reinforced elastomeric hoses and resultant product
A process is provided for vulcanizing an elastomeric reinforced hose or a hose having its core tube reinforced with fibrous material. In accordance with the process a hose having an elastomeric...
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4144299 |
Process for producing acrylonitrile polymer film
An acrylonitrile polymer film is produced by the steps of: Extruding an acrylonitrile polymer solution in a tubular shape into a coagulation liquid bath while a coagulation liquid is introduced...
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4130616 |
Tubular extrudate
Cooling a tubular extrudate for conversion to tubular film by passing the extrudate through a bath of cooling liquid so that the external surface of the extrudate contacts in sequence...
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4088724 |
External sizing and cooling of extruded tubular profiles of thermoplastic material
After extrusion tubular profiles of thermoplastic material are sized and cooled by the overpressure method. The internal pressure is produced and cooling effected by evaporation in the hollow space...
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