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Mold gate direct

An injection or transfer mold in which the cavity is filled with molding material through a spme or gate directly into the center of the part. [Pg.2201]

Nozzle, mold-gating In injection molding, a nozzle whose tip is part of the mold cavity, thus feeding material directly into the cavity, eliminating the sprue and runner. [Pg.660]

Sprue gating (direct gating) n. In injection molding with single-cavity molds, particularly those with circular symmetry, filling from the center with the sprue connected directly to the gate and mold cavity. [Pg.918]

FIGURE 1.104 Mold with direct gate and locking plug (source Fa. Frimo Group GMBFI, Lotte)... [Pg.112]

Fig. 13.7 Schematic representation of the flow patterns during the filling of an end-gated rectangular mold whose width is much greater than its thickness, (a) Width direction flow fronts at various times, (b) Velocity profiles in the fully developed region, and schematic representation of the fountain effect in the front region. Fig. 13.7 Schematic representation of the flow patterns during the filling of an end-gated rectangular mold whose width is much greater than its thickness, (a) Width direction flow fronts at various times, (b) Velocity profiles in the fully developed region, and schematic representation of the fountain effect in the front region.
The geometry of the molded part and the associated gating arrangement will affect molecular orientation within a part. A center gated part will reflect a biaxial orientation in the radial and circumferential directions. The skin layer of parts edge-gated along their entire width would be expected to exhibit preferential orientation in the flow direction. [Pg.382]

Table I gives the summary of CTE measurements made on neat and filled XYDAR molded parts. These CTE measurements were performed in a temperature range from 0-150 °C using a DuPont 942 thermomechanical analyzer (TMA). The CTE s shown in Table I are measured in the flow, transverse, and thickness directions for the formulation and part geometry specified. In a part of center-gated geometry, the radial direction is the flow direction and the circumferential direction is the width direction. All of the TMA testing was performed on aB-molded samples (no annealing). Table I gives the summary of CTE measurements made on neat and filled XYDAR molded parts. These CTE measurements were performed in a temperature range from 0-150 °C using a DuPont 942 thermomechanical analyzer (TMA). The CTE s shown in Table I are measured in the flow, transverse, and thickness directions for the formulation and part geometry specified. In a part of center-gated geometry, the radial direction is the flow direction and the circumferential direction is the width direction. All of the TMA testing was performed on aB-molded samples (no annealing).
In injection molded composites of polypropylene containing short glass fibers, the fiber orientation depended on the flow pattern (which, in turn, is related to mold thickness, the position of the gate, and flow rate)." Substantial variation was detected along the thickness of the sample. Crystallites followed a pattern of fiber distribution but they grew in a direction perpendicular to the direction of the fiber and specimen surface. The direction of spherulite growth was different in neat resin where crystallites grew parallel to the surface of the mold (specimen). [Pg.498]

The sprue is the channel from which the resin will flow through the gate and into the mold. Runners are perpendicular to the direction of draw, and the sprue is parallel to the direction of draw. This portion of the system is often recycled because typical OEMs allow up to 15% of regrind material (the use of polymer salvaged from the runner or sprue and not used in the original part). When injection molding takes place, automotive thermoplastics must be cooled under the Tm or T before ejection. [Pg.72]


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