Curing process plates

To make a decorated plate, the mold is opened shortly after the main charge of molding compound has been pressed iato shape, the decorative foil is laid ia the mold on top of the partially cured plate, ptinted side down, and the mold closed again to complete the curing process. The melamiae-treated foil is thus fused to the molded plate and, as with the decorative lamiaate, the overlay becomes transparent so that the ptinted design shows through yet is protected by the film of cured resia. 

After curing, the plates are allowed to finish the drying process in ambient or elevated temperature air. The moisture and metallic lead content of the cured plates should be substantially reduced to less than 2%. 

This reliable control of the curing process allows for stopping the polymerization after gelation, when the system has a fixed three-dimensional structure but is still mbbery and contourable. One potential application for employing the temporal control of the photopolymerization process would be in designing contourable fraction fixation plates. Figure 3(b) are the... 

Ethylenethiourea has a wide variety of uses in addition to vulcanization, a principal application since 1948. The curing process converts most of the ETU to other compounds, but traces of it are still found in the rubbers. Neoprene (polychloroprene) is found largely in automotive parts, wire and cable insulation, construction and adhesives. Consumer products containing neoprenes include container seals (e.g., aerosol dispensers) and shoes. It is also an intermediate in the manufacture of antioxidants, dyes, fungicides, insecticides, pharmaceuticals, synthetic resins, and a constituent of plating baths. 

With these properties and values the finite difference technique was used to model the curing process in sheet molding compound (SMC) plates using a heat balance with an exothermic reaction as... 

Disk brake pads and drum linings are finish ground to the final dimensions after the oven cure process. Sometimes, the surface of disk pad products are scorched or seared under the influence of heat applied in the 250-700" C range. This burns off the organics in the pad surface and helps the initial friction properties of brake pads. Scorching can be accomplished by a variety of methods—direct gas flame, contact with an electrically heated hot plate, or radiant heat from a heated surface. Subsequently, the parts are painted and stenciled with product information prior to packaging. 

After the reactions of paste sulfation start, plates that have been partially carbonated during the paste preparation, and especially during the plate-curing process, release CO2. 

Plate curing. Pallets with plates are placed in a high humidity chamber and left to cure at 35 °C for 48—72 h. During the curing process, lead in the paste is oxidized, the basic lead sulfates recrystallize and the plates are then dried to moisture content <0.5%. 

The process of plate curing has been investigated both for practical purposes, with the aim to improve the performance parameters of battery plates, and for purely fundamental purposes, namely to disclose the mechanism of the elementary processes involved [1—15]. Based on the results of these investigations the essence of the curing process can be summarised as follows. 

The plate curing processes are influenced by two types of parameters ... 

In order to slow down water evaporation from the plates during stay in the air, the pallets with stacked plates are wrapped with plastic (polyethylene) foil. Thus, a small closed space is formed which is quickly saturated with humidity and further moisture loss from the plates stops or is substantially slowed down. In the summertime, when the temperature in the production premises is relatively high, the stacked plates on the pallets are sprayed with water before being wrapped. Thus, the curing processes proceed more homogeneously across the plate stacks and in the plates themselves. 

With the first curing method water wfll evaporate from the paste most quickly and the curing process will stop at a very early stage. The degree of active mass formation and the capacity of the positive plates will be low (Table 8.3). In the second method of curing, with increase of temperature to 55 °C and RH = 80%, water evaporation from the plates wfll be slowed down... 

The characteristics of the plates on completion of the curing process should be ... 

The whole printing and curing process is repeated on the second side of the plates. This means that the first bead experiences a second cure cycle. This is not desirable, but is unavoidable. 

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