Blog Brochures Project Profiles. Slide 1 Waste Transformation We can take your waste material or process by-product and turn it into a value-added product. Home Waste Transformation. Project Profiles. Innovation Center. Nutrient Recovery. Complete Offerings. Waste Transformation Articles. What is synthetic gypsum? While natural gypsum has been mined and manufactured for centuries, the process of manufa Alcohol is normally employed as a volatile solvent to assist plasticization, and is subsequently removed. Cellulose A natural high polymeric carbohydrate found in most plants; the main constituent of dried woods, jute, flax, hemp, ramie, etc.
Cotton is almost pure cellulose. Cellulose Propionate An ester of cellulose made by the action of propionic acid and its anhydride on purified cellulose. It is used as the basis of a thermoplastic molding material. Cellulose Triacetate A cellulosic material made by reacting purified cellulose with acetic anhydride in the presence of a catalyst. It is used in the form of film and fibers. The film, which is of excellent clarity, has high tensile strength, and good heat resistance and dimensional stability. Applications include book jackets, magnetic recording tapes, and various types of packaging.
Cellulose triacetate sheet has somewhat similar properties to those of the film and is used to make such articles as safety goggles, map wallets and transparent covers of many kinds. Celsius Also referred to as Centigrade, is equal to the difference between the temperature in Fahrenheit less 32 and the quantity divisible by 1. This meaning is peculiar to plastics and rubber industries and may not be an adhesive composition. Center Gated mold An injection mold wherein the cavity is filled with resin through an orifice interconnecting the nozzle and the center of the cavity area.
Normally, this orifice is located at the bottom of the cavity when forming items such as containers, tumblers, bowls, etc. Centrifugal Casting A method of forming thermoplastic resins in which the granular resin is placed in a rotatable container, heated to molten condition by the transfer of heat through the walls of the container, and rotated so that the centrifugal force induced will force the molten resin to conform to the configuration of the interior surface of the container.
Used to fabricate large diameter pipes and similar cylindrical items. Chalking A powdery residue on the surface of a material often resulting from degradation.
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Charge The measurement or weight of material used to load a mold at one time or during one cycle. Chlorinated Polyvinyl Chloride Plastics Plastics based on chlorinated polyvinyl chloride in which the chlorinated polyvinyl chloride is in the greatest amount of weight.
Chlorofluorocarbon Plastics Plastics based on polymers made with monomers composed of chlorine, fluorine, and carbon only. Circuit In filament winding, the winding produced by a single revolution of mandrel or form. Clamping Plate A plate fitted to a mold and used to fasten the mold to a molding machine. Clamping Pressure In injection molding and in transfer molding, the pressure which is applied to the mold to keep it closed, in opposition to the fluid pressure of the compressed molding material.
Co-extrusion The process of combining two or more layers of extrudate to produce a multiple layer product in a single step. Coefficient of Expansion. The fractional change in length sometimes volume, specified of a material for a unit change in temperature. Values for plastics range from 0. Coefficient of Friction Static: the ration of the limiting friction developed to the corresponding normal pressure if two surfaces move relative to each other. Coefficient of Thermal Expansion The unit change in dimension of a material for a unit change in temperature.
Cold Flow or Creep A time-dependent strain of solids resulting from stress. Cold Molding The process of compression molding involving shaping an unheated compound in a mold under pressure then heating the article to cure it.
Read PDF Plastic Forming Processes: Assembly and Transformations (ISTE)
Cold Slug Well Space provided directly opposite the spruce opening in an injection mold to trap the cold slug. Cold Stretch Pulling operation, usually on extruded filaments, to improve tensile properties. Composite 1 A structure or an entity made up of distinct components. Compound These are chemical combinations of materials which include all the materials necessary for the finished product.
Compression Molding The process of molding a material in a confined shape by applying pressure and usually heat. Compression Ratio In an extruder screw, the ratio of volume available in the first flight at the hopper to the last flight at the end of the screw. Compressive Strength The ability of a material to resist a force that tends to crush it. Concentricity For a container, the shape in which various cross sections have a common center. Condensation A chemical reaction in which two or more molecules combine with the separation of water or some other simple substance.
If a polymer is formed, the condensation process is called Polycondensation. See also Polymerization.
Conditioning The subjection of a material to a stipulated treatment so that it will respond in a uniform way to subsequent testing or processing. The term is frequently used to refer to the treatment given to specimens before testing.
The 4 Steps of Rotational Molding Process - ROTOMADE
Conductivity The reciprocal of volume resistivity. It is the conductance of a unit cube of any material.
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Conductor A wire, or combination of wires not insulated from each other, suitable for carrying electricity. Continuous Service Temperature The highest temperature at which a material can perform reliably in long term application — long term being, however, inconsistently defined by the manufacturers. Convergent Die A die in which the internal channels leading to the orifice are converging only applicable to dies for hollow bodies.
Conveyor A mechanical device to transport material from one point to another, often continuously. Cooling Channels Channels or passageways located within the body of a mold through which a cooling medium can be circulated to control temperature on the mold surface. Cooling Fixture Block of metal or wood holding the shape of a molded piece which is used to maintain the proper shape or dimensional accuracy of a molding after it is removed from the mold until it is cool enough to retain its shape without further distortion.
Also known as Shrink Fixture.
Copolymer The chemical reaction of two different monomers with each other, result in a compound. Copper Clad Laminate Laminates i. Core The central member of a sandwich construction can be honeycomb material, foamed plastic, or solid sheet to which the face of the sandwich are attached; the central member of a plywood assembly.
Cores are usually withdrawn to one side before the main sections of the mold open. Also called Core Pin.
Corona Resistance A current passing through a conductor induces a surrounding electrostatic field. Resistance to this process is called corona resistance. Corrosion Chemical action which causes destruction of the surface of a material by oxidation or chemical combination.
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Also caused by reduction of the electrical efficiency between a metal and a contiguous substance or to the disintegrating effects of strong electrical currents or ground return currents in electrical systems.