Binders extrusion

Kobe Steel Co. [42] has patented a monolithic process for oxidation of Fe to Fe in acidic aqueous solutions using monolith made of carbon. The monoliths were prepared by mixing active carbon with a binder, extrusion, and thermal treatment. Slices 150 mm in diameter of cell density 20-60 cells/cm were tested. Monolithic slices 30 mm thick were stacked and separated one from another with turbulizers. The reactor was operated in the countercurrent mode with the gas flowing upward. The liquid was recirculated. The liquid flow rate was varied from 250 to 333 cm sec and the gas flow rate ranged from 83 to 250 cm sec . Pressure was up to 0.31 MPa. The oxidation efficiency was 34-80% at circulation time of 1800 sec, and rose to 89-93% at 3600 sec. 

The methionine and lysine monohydrochloride cores are produced by a melt-binder extrusion spheronization process. Particle diameters are ranging from 1.5 to 2.5 mm. The coating is composed of hydrophobic substances and a pH-sensitive polymer which is able to dissolve or swell in the acidic abomasal medium. The cores are coated in a fluid-bed coater using a solvent-free process (Fig. 3). 

Ceramics Welding rods Water-binder, extrusion aid... 

Typical processing methods paper and pulp processing methods, chemical processing methods used to produce cellulose derivatives, spinning (rayon), compounding (adhesives and binders), extrusion (cellophane) ... 

Crushing and miliing Mixing with binder Extrusion and drying... 

Among the more than several uses for polyethers in ordn application is as a binder for extrusion cast expls (Ref 3), and in a caseless propint charge where the charge is used as an ammo element (Ref 5). Also, some development work on the use of Poly acetal resins (polyform aldehyde)1 as a fuel has been done by Singhal T ien yief 7)... 

New Poly ester-Poly ether Binder for Extrusion-Cast Explosives , UCRL-50541, UAEC, Univ of Calif (1968) Ibid, NuclSciAbst 23 (9), 17314 (1969) CA 71,71343 (1969)... 

In many cases supports are shaped into simple cylinders (1-5 mm in diameter and 10-20 mm in length) in an extrusion process. The support powder is mixed with binders and water to form a paste that is forced through small holes of the desired size and shape. The paste should be sufficiently stiff such that the ribbon of extmded material maintains its shape during drying and shrinking. When dried, the material is cut or broken into pieces of the desired length. Extrusion is also applied to make ceramic monoliths such as those used in automotive exhaust catalysts and in DeNOx reactors. 

Compositions whose products of combustion produce energy in the infrared wave band are generally composed of magnesium powder, polytetrafluoroethylene (PTFE) and a binder. For efficient tactical utilization of the energy developed by the combustion process the composition is normally formed into pellets either by press consolidation or by press extrusion. The process being used at Longhorn at the time the electrostatic problem was encountered was press consolidation. The composition was being consolidated into a pellet... 

Styrene-based resins, extrusion of, 23 398 Styrene block copolymers, as mixed plastics compatibilizers, 21 454 Styrene-butadiene (SB) block copolymers, 20 324, 23 377, 393 Styrene-butadiene copolymer latex binders, 19 360... 

The first task was to produce carriers from different recipes and in different shapes as shown schematically in Fig. 8. The raw materials diatomaceous earth, water and various binders are mixed to a paste, which is subsequently extruded through a shaped nozzle and cut off to wet pellets. The wet pellets are finally dried and heated in a furnace in an oxidising atmosphere (calcination). The nozzle geometry determines the cross section of the pellet (cf. Fig. 3) and the pellet length is controlled by adjusting the cut-off device. Important parameters in the extrusion process are the dry matter content and the viscosity of the paste. The pore volume distribution of the carriers is measured by Hg porosimetry, in which the penetration of Hg into the pores of the carrier is measured as a function of applied pressure, and the surface area is measured by the BET method, which is based on adsorption of nitrogen on the carrier surface [1]. 

Numerous carriers were produced from different recipes and in different sizes and shapes in a 1 kg/min lab scale extruder and subsequently calcinated under different conditions in a furnace. The recipes included different types of diatomaceous earth, different types and amounts of binder and variation of the water content of the paste, which is a critical extrusion parameter. The shapes included among others rings, multiple-holed rings, finned rings, and trilobes, whereas normal cylindrical pellets were not made due to their well-known inferior activity to pressure drop ratio. 

VAE, a copolymer of vinyl acetate with minor amounts of ethylene is used as an adhesive for paper, plastics and leather and as a binder for different paints. Shoes, tubes, toys and other articles of daily use also contain VAE polymers. The hydrolysis product of VAE polymers, EVOH, is a thermoplast and can therefore be processed by extrusion and injection moulding and is used as barrier polymer for O2 and CO2 (e.g. in packaging applications). 

The zeolite crystals are in the form of fine powders, which would cause a very high pressure drop in a packed bed. They have to be formed into granules of approximately 3 mm in diameter, by using clay binders, such as kaolinite and montmorillonite. The methods consist of pelletization with binders under pressure into short cylinders, wet extrusion with a fluid into continuous cylinders, and granulation by rolling with binders into spheres. They also need to be dehydrated and calcined to remove volatile components before use. 

Barium titanate is made by sintering a finely powdered mixture of barium carbonate and titanium dioxide in a furnace at 1,350°C. The calcined mass is finely ground and mixed with a binder (plastic). The mixture is subjected to extrusion, pressing or film casting to obtain ceramic bodies of desired shapes. Plastic is burnt off by heating and the shaped body is sintered by firing and then pobshed. 

An extrusion press used in the manuf of fuel binder composite propellants for use in US aircraft jatos is shown in Fig 6... 

Mixing of the crystalline ingredients of oxidant, fuel elastomer binder (butadiene-2-methyl-5 vinyl-pyridine copolymer plasticized with the formal of diethylene glycol monobutyl ether) 26% by vol is done in a sigma blade mixer. The completed mix is blocked in a hydraulic press to form a chge suitable for extrusion. The extruded strand is cut into grain blanks which are cured at... 

Type and level of binder (e.g., MCC, NaCMC) Rotational speed of extrusion head Temperature... 

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