Parting lines parts, design factors

Whether floor space is a major factor in the design of a particular plant depends on the value of land near the proposed site. The engineer should, however, allot floor space economically, consistent with good housekeeping in the plant and should be sure to consider line flow of materials, access to equipment, space to permit working on parts of equipment that need frequent servicing, and the safety and comfort of the operators. 

Many injection molded products will influence the final product s performance, dimensions, and other characteristics. The mold includes the cavity shape, gating, parting line, vents, undercuts, ribs, hinges, and so on (Table 3-17). The mold designer must take all these factors into account to eliminate problems. At times, to provide the best design... 

Common problems like insufficient filling-packing and poor dimensional control are often related to the gate size and design. Similarly, gate location is another important factor. They should be located in areas having heaviest cross-section of the part to assure fill-out and elimination of sink marks. Also their position should not facilitate the residual molded stress formation in the part, knit line formation. 

NO acts as an autocrine factor that mediates HIV-1 replication as at the molecular level, NO seems to stimulate long-terminal repeat-mediated transcription [125]. It was noted that exogenous NO increases replication of HIV-1 T-tropic isolates in primary T cells or T-cell lines, and inhibitors of iNOS partly block HIV-1 replication, especially that induced by tumor necrosis factor a [125]. The contrasting effects of exogenous NO, particularly NO donors, may depend on the type of NO donors, their releasing kinetics, and the dose used in the study design. 

The size of the metal rods or hoops in unlined wood tanks is determined partly by calculations related to the hydraulic load imposed by the contents, but may be modified by dictates of past experience. As noted previously, the chemically-resistant masonry lining on the walls and the bottom may impose additional loads on the walls requiring more tie rods or hoops. The tank designer should be aware of the possibility of loads on the structure caused by the irreversible growth characteristics and the thermal expansion of the chemically-resistant masonry. The accidental soaking and consequent swelling of the dry wood shell may also be a factor to allow for. 

---