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A parting line in moldmaking is the place where two or more parts of the mold meet.[1] Parting lines occur due to minute inherent gaps between two mating faces of halves of the die. The material filling into these gaps is generally called molding flash or simply flashing. Parting lines generally show up as a raised line around the product (witness mark) on commodity products such as toys.

Many applications (seals, tight running molded parts) that require precision for shape control, call for removal of flashes. Secondary operations are thus employed, in addition to high precision molding dies to remove these flashes. Many molders will repair or even replace the mold tooling so that the flash is reduced to an acceptable tolerance or eliminated altogether. Secondary operations to remove parting line flash include hand trimming, vibratory tumbling, media blasting and cryogenic deflashing.[2]

Flashes are known to improve sealing between mating faces in some instances (Fuel tank seals, hydraulic power steering gear, etc.), and thus flashes are permitted to some extent in special cases.

In engineering drawing, parting line is often abbrivated as PL. ASME's Y14.8 standard specifies a symbol for parting line.[3]


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5 news items

Florida Sportsman Magazine

Florida Sportsman Magazine
Tue, 22 Jul 2014 08:33:45 -0700

The hook should be inserted in the parting line seam on the underside of the bait on the side to which the worm's tail naturally curls. This allows the tail to fully extend and vibrate on the retrieve. Sinker weight controls running depth and speed. A ...

Plastics Today

Plastics Today
Mon, 21 Jul 2014 16:03:45 -0700

The critical features of the lens design are the optical insert break-out, the parting line and the gating. "Gating the lenses and shields at proper place results in a good optical part," Bourque said. "A gate at the wrong place can impact the optical ...
Hawke's Bay Today
Mon, 14 Jul 2014 16:56:06 -0700

The parting line from commentator Adrian Healey may not have gone down well at, say, Copacabana, where tears flowed from almost every duct as the Argentine fan zone looked away from the big screen and bade farewell to their World Cup dream.
Plastics News
Wed, 02 Jul 2014 13:14:28 -0700

They also designed a multi-shot component that eliminated the parting line of the TPE sealing surface. Piermarini said the return on investment of over $1 million in tooling and assembly equipment was achieved in less than a year. He said that the ...


Wed, 16 Jul 2014 03:18:45 -0700

Just yesterday he posted an Instagram picture of h more texturized German cut, with indlela, (that parting line in his hair) Black folk will know what we're on about. We couldn't help but wonder which hair relaxing product he used on his greasy, new ...

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