On the opposite side of the ghost mark there is always a corresponding structure or feature in the mould.
The aim of this article is to describe and characterize the aesthetic defect called ghost mark and discuss possible formation mechanisms during the injection molding process.
Characteristic for the ghost mark is that it is visually apparent only in certain illumination conditions and in particular viewing angles.
Figure 3 shows the appearance of another typical ghost mark on a component manufactured with the leather-like texture.
The higher visually perceived gloss on areas having the ghost mark defect is likely connected to their higher reflectance in angles close to the specular angle.
In this case the reflectance from the area with a ghost mark was lower than the reflectance from the defect-free region at angles near the specular angle.
3c), the difference in reflectance from an area with and without a ghost mark defect was less evident which is shown in Fig.
The ghost mark defect is characterized by a local change in gloss of textured injection-molded ABS components which is only visually detectable under certain viewing conditions.
The SEM studies indicate that it is likely that the ghost marks are associated with small-scale deformations of the surface texture.
However, further trials have shown that increasing the thickness alone does not remove the ghost marks completely.
Molded from a silicone-free material that resists heat up to 356 [degrees] F, Anver Nomathane vacuum cups are exceptionally pliable and will not leave any invisible ghost marks
or mold-release agents on delicate parts, the company reports.