Manufacturing processes curing

Incomplete matrix curing is due to an incorrect cure cycle and may occur due to inaccurate mixing of compounds or temperature or pressure variations during the manufacturing process. Cure failure can also occur in the adhesive layer and develop into a more significant fault, thus reducing further the structural integrity of a material. 

Process Raw Material. Industrial solvents are raw materials in some production processes. Eor example, only a small proportion of acetone is used as a solvent, most is used in producing methyl methacrylate and bisphenol A. Alcohols are used in the manufacture of esters and glycol ethers. Diethylenetriamine is also used in the manufacture of curing agents for epoxy resins. Traditionally, chlorinated hydrocarbon solvents have been the starting materials for duorinated hydrocarbon production. 

Proof Casting of Dies and Molds. Low melting ahoys make the process of diemaking faster and easier. The low temperature ahoys can be cast into a mold pattern at virtuahy any point in the manufacturing process without long delays in production and without the possibhity of heat distortion. These ahoys produce a casting that is exact in detail, requires no curing time, and is completely reusable. 

Parallam, or laminated strand lumber (LSL) is a beam made by a continuous manufacturing process composed of bigger-size wood needles (very elongated wood particles) reassembled with a structural exterior grade adhesive, the favorite adhesive being isocyanates (pMDI) when heat-curing and PRFs when cold-curing. 

Unlike most conventional materials, there is a very close relation between the manufacture of a composite material and its end use. The manufacture of the material is often actually part of the fabrication process for the structural element or even the complete structure. Thus, a complete description of the manufacturing process is not possible nor is it even desirable. The discussion of manufacturing of laminated fiber-reinforced composite materials is restricted in this section to how the fibers and matrix materials are assembled to make a lamina and how, subsequently, laminae are assembled and cured to make a laminate. 

Figure 11.4 The glass wool manufacturing process. 1 Tank 2 forehearth 3 spinners 4 conveyor 5 curing oven 6 trimmers 7 slitters 8 bandsaw 9 guillotine 10 rolling machine.

Extreme heat In the manufacturing process, belts are cured with scientifically controlled heat for given periods of time. If standard belts are operated below 140°F, their materials of constmction are not affected. However, at temperatures above 140°F, over-curing will occur and belt life will be shortened. Therefore, the use of standard V-belts above this temperature should be avoided. Often, adequate shielding between the heat source and belts can be provided. 

FT300, C6000, and AS4 are intermediate modules (30-40 msi) PAN-based graphite fibers Processed at the Langley Research Center using manufacturers recommended cure cycle... 

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