flow marks

flow marks

[′flō ‚märks]
(materials)
Wavy surface marks on a thermoplastic resin molding due to improper flow of material into the mold.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
"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.
It is furthermore of great importance that the surface is free from aesthetic defects such as weld lines, flow marks, sink marks, or other gloss - and color variations.
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. Processability is said to be improved as the injection pressure can be reduced by about 30-40%, injection temperatures can be lowered by 10[degrees]C (50[degrees]F) and shorter cycle times are possible, depending on part size and wall thickness.
"ExxonMobil Chemical developed Exxtral polyolefin grades, which underwent extensive testing to make sure the mechanical and long-term aging properties, and paintability, met Chevrolet's requirements." Owing to its high melt flow rate and formulation design, H 1725 produces good surface appearance without issues like "flow marks" and "tiger stripes" for molded-in color exterior parts, the company says.
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." A shiner is a nail that missed the framing member, in this case when the carpenter nailed the roof sheathing to the rafters.
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.