flow marks

flow marks

[′flō ‚märks]
(materials)
Wavy surface marks on a thermoplastic resin molding due to improper flow of material into the mold.
References in periodicals archive ?
Calcium sulphate flow marks in quality caf c35 f7 in total approx.
Figure 7 shows that when optimizing the backward parts of exhaust pipes by removing the step surface, we just found a few flow marks of urea drops instead of lump deposits on the exhaust pipe wall.
Or we might see flow velocities inside the mold that are high enough to run the risk of galling or erosion of the cavity or low enough to prevent the mold from filling completely We also can see when temperatures drop too low around the front of an advancing wave of molten metal, which can lead to flow marks on external surfaces.
Polymer degradation due to hydrolysis or oxidation, blistering due to excessive heat of the tools or material, or flow marks due to the incorrect flow speed of material are all problems that can be experienced by moulders.
The gates are also designed to control the volume and direction of molten plastic flow in the cavity and to raise polymer temperature by viscous dissipation so that flow marks and weld lines are reduced (7), (8).
Santoprene 121-XXM200 TPV grades are said to exhibit a low dynamic viscosity which results in enhanced flow over a wide range of shear to produce molded seals with excellent surface appearance and no flow marks.
Water flow marks the beginning of Phase Two work characterized by the development of infrastructure, which includes the construction of wide-streets, internal bridges connecting the islands with one another, large upper bridges connecting the project with surrounding main roads, gardens, and car parks carefully distributed throughout the project, in addition to providing electricity power grids and water and deflation services.
We need to know how the tool is gated and how to control the flow of the material selected to avoid flow marks and control the gloss of the part," Margaret Hackstedde, director of product design for color and trim at Chrysler, explains.
If you can't see any telltale flow marks, and since the stain is fairly small, look at the underside of the roof for "shiners.
According to his new model, it's far more likely that the highest flow marks reflect superelevation of a 3-to-10-m-deep flow of snow that raced around and up the side of the curve during an avalanche lasting about 23 seconds.
However, the sedimentary areas do not show any flow marks.