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Littleford Day Inc. Where Processing Ideas become Reality.
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Plastics Littleford Day Inc. Where Processing Ideas Become Reality.
Mixing, Dispersion, Compounding and Drying Equipment for the Plastics Industry Littleford Day Inc. Where Processing Ideas Become Reality.
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Littleford Equipment for the Plastics Industry Presentation Index
Page Contents 4 TECHNICAL DATA The “Fluidized-Bed” Option for Mixing & Drying Plastics. AND EQUIPMENT Liquid Dispersions into Resins. SPECIFICATIONS: The Horizontal “Fluidized-Bed” Mixer for Plastics. How do we build them. Regular Sizes of the Horizontal Mixers. The “Fluidized-Bed” Mixing Advantages. Our High Intensity Vertical Mixers. Our Horizontal Coolers. Regular Sizes of High Intensity Vertical Mixers and Horizontal Coolers. Complete Compounding Centers. Pellets. Integrated Systems. Drying Plastics with Littleford. The advantages of “The Chopper” for drying. APPLICATIONS: Reinforced Thermoplastics. Plasticized PVC Dry Blend. Reinforced Thermosets. Plastisols. Glass Reinforced Polyesters (BMC). Sheet Molding Compounds (SMC). Color Concentrates. Plastic Powder Coatings. Drying. Surface Coating. Thermoplastic Resins. PVC Compounding and Cooling. SUPPORT: Rental Program 30 Service and Spare Parts Process Development and Technical Center.
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The “Fluidized Bed” Operation for Mixing & Drying:
Liquid dispersion is done by spraying liquids against fluidized powder, by Top and / or Bottom Mounted Nozzles. The unique action created by the movement of the mixing elements produce intense but gentle intermingling of the materials of the mix in a mechanically fluidized bed. The unique mixing action of the FKM series mixers is accomplished by a horizontal shaft which revolves at a high rate of speed rapidly projecting and hurling the mix materials away from the vessel wall into free space, filling the entire vessel. The mixing action causes the materials to crisscross in the direction of the vessel walls and inversely back again, providing a high volume rate of material transfer. The mechanically fluidized bed of particles is the basis of it´s mixing efficiency and accuracy, including mixtures with diverse specific gravities as well as other problems such as liquid incorporation and heat transfer. Mixing elements are designed to force the product into appro- priate components of axial & radial motion. High-Speed Blending Choppers enhance mixing action by controlling particle size and trace ingredient dispersion, usually without the need for additional process steps.
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sprayed liquids flowing in the opposite direction.
Chopper Action, sending fluidized particles upward, against sprayed liquids flowing in the opposite direction. Superb Liquids Dispersion into Powders, through high speed Choppers (Showing Top Injection Type. Bottom Liquids Injection also available)
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Manufacturing Options:
Vacuum System: Stack (s) Pulse Back Filter (s) Condenser, Receivers. Vacuum Pumps. Material: C.Steel, 304 S.S., 316 SS., Special. Interior: Std. #120 Grit or higher. Liquid Injection: Tower, Manifold. Top and / or Bottom Mountings. Vessel Construction: Atmospheric Std., Vacuum Rated, Pressure Rated, Sanitary Construction. FDA Ratings. Electric's: H.P., TEFC,Expl.Proof. Feeding Ports Drive Type. Sanitary or Welded Design RPM´s: 1 or 2 Speeds, Variable Speed. Hydraulic Coupling. Seals: Std. Packing, Positive Pressure Mechanical. Plows: Std.,Heat Transfer, Becker Jacket. Std. 75 PSI Other PSI Ratings Heating & Cooling Special Bases, Load Cells. Choppers: H.P., TEFC, Expl.Proof Blade Types Discharge Valve : Manual,Pneumatic. Ball type, Butterfly, Spherical & Slide Options. Control Panels: Manual, Automatic. RPM Control Batch Times, Amp,Power,Reports
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How do we build them: Vacuum Systems Pulse Back Filters.
Standard or Sanitary Construction. TEFC or Explosion Proof Electric's. Full Vacuum or rated for several Internal Pressure Ratings. Single or Variable Speeds. Vacuum Systems Pulse Back Filters. Shell in Carbon Steel 304 SS or 316 SS #120 Grit finish. Liquid Dispersion Systems. Access ports with safety limit switches. Littleford Reinforced Shafts and Drives. Std.Packing, Air type & Mechanical Seals Jacket designed for high rates of thermal transference. 75 PSIG Mixing Plows designed to create a fluidized bed and excellent thermal transfer. High Speed Choppers, for granulation control, lump breaking & dispersion Contour discharge Valve, for No-Dead Spots
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Regular sizes for Horizontal Mixers:
Working capacity depends on the process, and is normally between 50% and 70% of total capacity. TOTAL CAPACITY DIMENSIONS * Model Liters Gallons Cu.Ft A B C FKM-300-D ” ” 35” FKM-600-D ” ” 43” FKM-1200-D ” ” 43” FKM-1200-E ” ” 50” FKM-2000-D ” ” 51” FKM-2000-E ” ” 60” FKM-3000-D ” ” 60” FKM-4200-D ” ” 68” FKM-6000-D ” ” 80” FKM-8000-D ” ” 80” FKM D ” ” 80” FKM D ” ” 92” FKM D ” ” 96” FKM D ” ” 107” FKM D ” ” 110” A B C * Aprox. Vessel Dimensions Littleford Day Inc.
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The Littleford Advantages:
Littleford Ribbon Tumbling P. Kelly Nauta Sigma Process FKM / DVT Blender Mixers Types Types Units Littleford Day Inc. Where Processing Ideas Become Reality. X X X Accurate mixing of different density components. Yes Poor X Complete dispersion of liquids with dry powders. Poor Partial Partial Poor X X X Lump breaking, for control of particles sizes. Poor Partial X X X X X Fluidized-Bed particle movement for higher heat transfer. X X X X X Extremely fast Batch Times of 2-4 Minutes on dry powders. X X X Continuous deagglomeration for more efficient drying. Poor Partial
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Our High Intensity, Vertical Mixers:
Manual or Automated Operations ... Cover: Pneumatic Operation. Vent Bag & Support Feeding Inlet Ports. High Strength Vessels with 1/2” Insulation, SS-304 Construction Deflector Blade with thermocouple/liquids tube Impellers designed for homogenous Temp. raise, & High Dispersion. Coated with Abrasion Resistant Materials. Designed to avoid Over-Heated and Wearing spots. Littleford Belt Drive with Special High-Torque motor, reinforced shaft, insulation & bearings. One or Two Speeds. Discharge Valve: Pneumatic Operations, Manual or Temp. Controlled Perfect Seal to avoid leaks.
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Our Horizontal Coolers:
Cooling Jacket designed for high rates of thermal transference. For 45 PSIG Feeding, Double Batch and Vent Ports. Reinforced Shafts and Drives. Littleford Contour discharge Valve Access ports with safety limit switches. Cooling / Mixing Plows designed to create a fluidized bed and excellent thermal transference. Typical Cooling for PVC: From 240° to 120° F.
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High-Intensity Vertical Mixers. Horizontal Coolers.
Specifications and Regular Sizes. Littleford High Intensity Mixers: Specification W W W W W W-2000 Working Cap C.F C.F C.F C.F C.F C.F. Batch Weight # # # # # # Horsepower /50, /100, /125, /250, /350, /500,500 Littleford Horizontal Coolers: Specification K K K K K K-6600 Working Cap C.F C.F C.F C.F C.F C.F.
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Complete Compounding Centers
Extra Hoppers Liquid Addition System. CONVENIENCE: Resin Weight Hopper FANCY: Minor Ingredients Addition Systems THE HEART: Mixer. One or Two Speeds MODERN: Double Batch Op. Littleford USUAL COMPLEMENT: High efficiency cooler Littleford Day Integral Solutions for PVC Pneumatic Transport To Bins
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Pellets. Integrated Systems
Liquid Addition Capacities: LPS180: Kg/Hr. LPS400: LPS1200: 1,000 Dust Collector Weight Bin Pellets Cooler Mixer Littleford Cooling Fan Extrusion Bin Pelletizing Head Pneumatic Conveying Fan Extruder (Optional) Pre-Assembled Plants for PVC Pellets manufacturing.
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Drying Plastic Resins In The Littleford.
1.-High efficiency drying of Suspensions, pastes, and bulk materials. 2.-Fast drying cycles and discharge. 3.-Allows efficient drying of sensitive materials at low Temperatures. 4.-Complete dispersion of agglomerates, lumps and fiber bundles. 5.-Homogeneous mixing of dissimilar ingredients. 6.-Drying operations from liquid state to free-flowing powder in one vessel. 7.-Allows liquid addition during processing. 8.-Adapts itself to effective recovery of costly solvents. 9.-Eliminates need for additional processing equipment. The Key to this State-of-the Art drying technology is the unique, mechanically fluidized ploughshare action which agi- tates and individualize the solid parti- cles to be dried. The ploughshare action forces the product into a 3-dimensions motion that individualizes each particle, continuosly exposing tremendous surface area for drying The particles constantly contact one another, and the heated inte- rior walls of the jacketed vessel furthering the drying process Our dryers are also equipped with independently operated, high shear choppers, to reduce the particle size of the lumps or agglomerates, to expo- se undried materials and ensure thoroughly dried particle interior. Deagglomeration further shortens drying time. Heated Pulse Back Filter with Stack. Wet Product Condenser Littleford Dryer. Dry Product Recovery Tank. Vacuum Pump.
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Advance Drying: The Chopper Advantages in Drying:
Fast, efficient drying without lump formation M O I S T U R E DRYING TIME PASTE GRANULE POWDER Internal Drying without Choppers External Drying with Choppers The action of the turbulent plows and the high shear choppers reduce the forming lumps to smaller granules, thus exposing large amounts of new surface area for drying.
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Reinforced Plastics Mix Includes: Thermoplastic Powders.
Beads & Chopped Strand Fiberglass. Prior to extrusion or Injection molding, bundles of chopped strand fiberglass must be uniformly mixed with thermoplastic pellets, chips, beads or powder without filamentizing the fiberglass strands. The mechanically fluidized bed mixing action of the Littleford mixer separates the thermoplastic particles and gently blends in the fragile glass bundles. In a short mix cycle, often 15 to 30 Seconds, a 30% Glass Blend can be attained to an accuracy of less than 1.0%. There is no degradation of the fiberglass. The blend is discharged with the plows rotating to prevent stratification of the mixed materials. The very short mix cycles attainable in a Littleford Mixer enable more frequent batching. This means a reduction in capital investment by utilizing a smaller volume Littleford Mixer, rather than a large volume and long cycle time conventional mixer. Also, the Littleford mixer lends itself well to totally automated operation. Advantages: Seconds Mix Cycles. 2.- No Filamentizing Of Glass Strands. 3.- No Stratification Of Discharged Product. 4.- Uniform Blend.
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Plasticized PVC Dry Blend
Mix Includes: PVC Resin, Fillers, Pigments, Plasticizer, Stabilizer. “Dry Blends” of highly plasticized, filled, vinyl polymers and copolymers to be calendered into sheeting or flooring are prepared in the Littleford Mixer. For high volume applications, batches as large as 5,000 to 6,000 pounds can be prepared in very short mix cycles. These batch mixers are unexcelled as heat transfer vessels. (The mechanically fluidized bed mixing action creates tremendous particle surface exposure, which combined with constant movement, creates contact of all particles with the heat transfer surfaces.) Thus, completely jacketed mixing cylinders are able to transfer external heat to the product at extremely high rates. Due to the uniformity and temperature attained in the “Dry Blend”, the Banbury mix cycle is usually reduced. Banbury throughput increases of more than 10% have been reported. Finish product uniformity and quality has also been improved. Advantages: 1.- Highest Coefficient Of Heat Transfer. 2.- Low Horsepower Requirement. 3.- Thorough Plasticizer Absorption. 4.- Complete Product Uniformity. 5.- Large Batch Sizes.
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Reinforced Thermosets
Mix Includes: Phenolic Resin, Wood Flour, Fibers, Pigments. Thermosetting molding compounds require high shear to disperse the pigments, fillers, and reinforcing fibers, plus exact temperature control to protect the resin. With conventional mixing equipment, pre-milling and post-milling operations are usually required. A uniform flow, labyrinth-design jacket surrounds the circumfe- rence of the Littleford mixer, thus providing exact temperature control. The unique mix action creates outstanding particle to heat transfer surface contact, resulting in an exceptionally high coefficient of heat transfer. The mixers, when equipped with high speed choppers, produce the high shearrequired to disperse and develop the pigment in a short mix cycle. Reinforcing fibers are dispersed uniformily without breakage or da- mage. Liquid additives can quickly be dispersed without agglome- rate formation. Premilling of the batch components can be greatly reduced and postmilling and homogenization operations completely eliminated. Advantages: 1.- Short Mix Cycles. 2.- No Filamentation Of Fibers. 3.- No Stratification Of Discharged Product. 4.- Uniform Blend.
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Plastisols Mix Includes: Fine PVC Resin, Pigment,
Plasticizer, Stabilizer. The unique plow-shaped design of the Littleford mixing tools creates a shear action which develops a suspension of extre- mely fine powdered PVC resins in plasticizers to produce agglomerate free plastisols. The mix cycles are very short, hence the plastisol is formed with little or no heat generation. The mixing action is so uniform that there is no tendency to form gels. In some cases, plastisols of lower viscosity require a higher degree of shear action. This can be provided in the Littleford mixer by equipping the unit with a high speed chopper located such that the mixing plows constantly bring fresh material into their path for effective dispersion. The mixer may be equipped for vacuum operation to permit the dynamic removal of entrained air from the plastisol. The mixing cylinder can also be completely jacketed to maintain optimum temperature for reactions, solvations and viscosity adjustments. Advantages: 1.- Short Mix Cycles. 2.- No Heat Generation. 3.- Thorough Dispersion, Usually Off The Hegeman Grind Gauge. 4.- Mixing And Deaeration In Same Littleford Mixer.
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Glass Reinforced Polyesters (BMC)
Mix Includes: Catalysts, Chopped Strand Fiberglass, Pigments, Fillers, Polyester Resin. Compression molding compounds of fiberglass reinforced polyester resins can be quickly prepared in the Littleford mixer. The Littleford intermediate Intensity Mixer can pro- duce a complete, quality molding compound of fiberglass reinforced Polyester resins in very little time without fila- mentizing the glass fibers. Fillers, pigments and catalysts can be homogeneously combined with the viscous Polyester Resins in very short mix cycles without the need for premixing the resins in a separate piece of equipment. Mixing one or two minutes after the addition of glass fibers causes all of the fiber bundles to be opened and uniformly coated with little or no fiber degradation. In addition to a reduction in process time and equipment, the physical properties of the final molded part are genera- lly superior to those of parts produced by other methods. Advantages: 1.- Short Mix Cycles. 2.- Minimum Glass Degradation. 3.- Higher Physical Property Of Molded Parts. 4.- Lower Capital Cost Than Double Arm Mixers
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Sheet Molding Compounds (SMC)
Mix Includes: Catalyst, Pigments, Fillers and Polyester Resin. Sheet molding compounds, although of various viscosities, are generally in the form of a paste. The Littleford intermediate Intensity Mixer rapidly disperses large quntities of fillers, pig- ments and other required additives into liquid resins to produce a homogeneous sheet molding compound. The general mixing procedure is to charge the liquid resins into the statc mixer, the catalyst and dispersing agent are added, followed by the addition of the filler, pigment and other ingre- dients. Throughout the process, exact batch temperature is controlled by utilizing a uniform flow heating/cooling jacket. The mixer can be equipped for the dynamic removal of all gases from the product. This is accomplished by mixing within a vacuum environment while simultaneously deaerating. This process substantially reduces the mix volume, resulting in a higher bulk density. Vacuum deaeration causes no apprecia- ble increase in the mixing time required. Advantages: 1.- Short Mix Cycles. 2.- Complete And Rapid Dispersion. 3.- Easily Automated. 4.- No Heat Generation.
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Color Concentrates Mix Includes: Pigments, Lubricants, Beads or
Pellets, Thermoplastic Powders. Surface coating alone is often inadequate for dispersing a high concentration of pigments and additives. The resin surface can not retain the concentrations required. High concentrations of pigment and additives must be driven into the thermoplastic resin with great force. When the point is reached where the resin particle contains the maximum amount of additives it can retain, higher concentrations can be achieved by a homogeneous blend of additive particles within the bed of enriched resin. The Littleford High Intensity Vertical Mixer is well suited for this application, with typical 1 to 2 minutes cycles. Its mix action creates an intensive impingement of lubricant, pigment and additives upon the resin particles in combination with thorough blending and complete breaking up of agglomerates of additives, as well as pigments. The cover is hydraucally operated, and when open exposes the entire mixer interior for easy cleaning between batches. Advantages: 1.- Short Mix Cycles. 2.- Uniform Surface Coating. 3.- Agglomerate Free. 4.- Easy To Clean.
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Plastic Powder Coatings
Mix Includes: Pigments, Plastic Resins And Fillers. The preparation of plastic powder coatings requires a premix process where large resin flakes are broken down and unifor- mly dispersed with pigments and other additives. Following melt-extrusion and high energy milling, a flow agent must be precisely combined with the premix. The premix blend is prepared in a Littleford mixer. High speed choppers break down the large resin flakes as the plow action effects an intimate dispersion of pigments and additives. A cooling jacket allows exact temperature control. The flow agent is also applied in a Littleford mixer after milling the premix into a fine powder. The dual mix action provides the critical dispersion required, while the jacket maintains the desired temperature. Air seal prevent “hot” spots around the all high speed rotating shafts. Advantages: 1.- Rapid Deagglomeration Of Flake Resins. 2.- Pigments Rapidly And Thoroughly Dispersed. 3.- Short Mix Cycles. 4.- Uniform Dispersion Of Light Density Flow Agents.
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Drying Mix Includes: Plastic Resins. Advantages:
Drying, often important to the value and usefulness of many finished products, is of vital importance in the plastics indus- try. It is crucial to remove even trace amounts of moisture prior to final processing. The Littleford Mixer is an ideal Dryer. Individual particle separation is created by the unique dual mix action. The entire surface of each particle is exposed for drying continuously throughout the operation. When equipped with a heating jacket, drying results as each particle comes in contact with the heated jacket surface. For heat sensitive materials, warm dry air may be injected into the product at atmospheric pressure. The dry air absorbs mis- ture and is removed from the unit, carrying the moisture with it. The Littleford Mixer, when equipped for vacuum operation, is capable of dynamically removing moisture within a short drying cycle. Vacuum operation also allows the removal and recovery of expensive solvents. Advantages: 1.- Excellent Heat Transfer Coefficients. 2.- Dry To Low Moisture Levels, Less Than .05% 3. Vacuum, Atmospheric Or Air Purge Operation.
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Surface Coating Mix Includes: Pigments, Lubricants,
Thermoplastic Powders, Beads or Pellets. Thermoplastic resins in the form of pellets, beads, chip or powder, require the addition of pigments, lubricants and processing aids prior to final processing. This can be accom- plished in a Littleford Mixer in a very short mix cycles, as low as 30 to 45 seconds. Blending & coating action is rapid, thorough and very gentle. The mechanically fluidized bed mix action exposes all product surfaces to assure complete unifor- mity of coating. The resultant short mix cycle enables to supply batch or continuous mixers. Continuous operation provides high output capacities at a modest capital investment. In applications where thermoplastic resin pellets are utilized, the gentle mixing action has a minimum tendency to gall the pellets. It lends itself well to blending ingredients having wide differences in size, such as pellets and pigments. Because each pellet receives a uniform surface film coating of lubricant, a consistent amount of dispersed pigments adheres to each pellet. Advantages: 1.- Short Mix Cycles. 30-45 Seconds. 2.- Uniform Surface Coating. 3.- Gentle Mix Action Without Product Degradation. 4.- Batch Or Continuous Mixer Application.
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Thermoplastic Resins Mix Includes: Polyethylene Or Polypropylene
Resin, Trace Amounts Of Additive. To meet the special requirements of certain finished products, trace amounts of additives must be introduced and uniformly dispersed throughout thermoplastic resins. These processed resins are often produced in high volumes (2,500 to 50,000 Lbs/Hr). The Littleford intermediate intensity batch or continuous mixer, with it´s unique dual mix action, is capable of meeting these high volume demands with a minimum retention time. The accuracy of additive dispersion is often within 1% coefficient of variation. When equipped with a uniform flow cooling jacket, the Littleford batch or continuous mixer can eliminate conventional post-mix cooling equipment by simultaneously mixing and cooling. This is accomplished without any significant increase in mixing cycle time. For such an application, for example, The Littleford Model KM-3000 (53 cubic feet working capacity), would be capa- ble of an aproximate throughput of 35,000 Lbs./Hr. Advantages: 1.- Short Mix Cycles. 2.- Uniform Additive Dispersion. 3.- High Volume Processing. 4.- Simultaneous Cooling.
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PVC: Compounding and Cooling. Mix Includes:
PVC Resin, Pigment, Fillers Stabilizer, Modifiers. The Littleford PVC Processing system has been developed specifically to compound and cool polyvinyl chloride and similar materials. A vertical high shear, high intensity mixer has been matched and synchronized with a low intensity horizontal cooling unit that utilizes the mechanically fluidized bed mixing action to attain an extremely high degree of heat transfer. Littleford PVC processing system is a very compact installation with a wide range of output capacities. A COMPLETE COMPOUNDING CENTER The optional Littleford Compounding Center is a complete prefabricated “Package Plant” designed for High-Volume continuous processing of powdered PVC. It combines a resin scale system, Littleford High-Intensity PVC hot compounder and large capacity Littleford cooler, stabilizer dispensing sys- tem, take away system and integrated automatic controls. Advantages: 1.- Controlled, Rapid and Homogeneous PVC Compounding. 2.- Fastest Heating And Cooling Cycles. 3.- Less Bow and Blade Wear. 4.- No Cooling Bottleneck. 5.- All U.S.A. Made.
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Rental Programs In addition to our Process Development & Testing Programs, our Rental Program offers a unique opportunity to test our processing equipment in your own Plant. Batch Mixing / Processing Ploughshare Units, both for atmospheric / vacuum and Pressure Ops. : From Table-Top 5 & 20 Lts units to Pilot 130 Lts. Machines Larger sizes are available. W-10 High - Intensity vertical mixer, for PVC Compounding and /or other applications req- uiring High-Shear Op. Ten Liters Capacity. Daymax # Dispersers, for high quality dispersions of solids into liquids, such as plastisol, varnish, paint, and other applications. FA-3.5 Mixer, Nauta-Type, for special mixing / drying requirements Gallons Working Capacity. A portion of the rental cost, under this program, will be applied to the purchase of any related Littleford Day Equipment.
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Service & Spare Parts Exclusive Dept. for customer assistance.
Laboratory for formulations & optimization. Specialized Field Service Engineers. Stock of common required parts. Top American Mfrd. Parts: SKF, Falk, Chesterton, etc.,etc. Assistance in Spanish, if required. The Best Service Department. Direct Sales Force. No Reps. Own Manufacturing Facilities.
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Process Development & Testing
Main Office: Florence, Ky. Ph.- (606) Fax: Latin America: Mexico Cy.Ph.- (52-5) Fax: Minutes away from Greater Cincinnati Airport, Our Lab. Center is fully equipped with all the required machinery for product development: Mixers, Dryers, Reactors, Granulators, Intensive Mixers-Coolers and support equipment such as filtering and vacuum drying systems. Cosmetics Detergents & Soaps Foundry Additives Pharmaceutical Ceramics Fertilizers/Seeds Rubber Mortar Mixes Brake Linings Powdered Metals Herbicides Flame Retardant Chemicals Pigments & Color Flushing BMC & SMC Plastics. Color Concentrates PVC Compounding Coatings Plastisols Adhesives & Caulks Inks & Varnish ChemicalReactions & Drying Cellulose Reactions Spices Chocolate processing Gelatin & Powdered drinks Bakery Mixes Instantanization Industrial Road (1 Mi) Donaldson Rd. Turfway Rd. U.S. 42 Exit 180 Florence Union Greater Cincinnati Airport I-275 I-75 To Lexington To Cincinnati 7451 Empire Drive Florence, KY (1/2 Mi) Technical Center Main Equipment: FM-130 Mixer/Processor Ploughshare DVT-130 Polyphase Reactor KM-150 Continuous Mixer/Processor M-5 Lab. Mixer & Dryer W-180/K-300 PVC Compounder W-10 High Intensity Mixer Daymax 10 Pastes Disperser Daymax 100 Pastes Disperser Mixtruder Sigma Double-Arm Mixer Mogul Tangential Sigma Mixer Cincinnatus Overlapping Sigma Mixer FA-10 Nauta Processor Bring Us Your Toughest Mixing, Drying & Reacting Problems.
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