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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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4 news items

Streetsblog Los Angeles (blog)

Streetsblog Los Angeles (blog)
Mon, 11 Aug 2014 16:22:51 -0700

It is however is no joke that Levi's has opened a “pop-up” “commuter workshop” in Downtown Los Angeles, rather than a more traditional location for such Brigadoon-like ventures such as Melrose. Even choosing Downtown, one would expect to see this ...
Plastics Today
Wed, 13 Aug 2014 12:41:15 -0700

Ewikon Molding Technologies, together with Sumitomo (SHI) Demag, will host a Technology Day on September 23, 2014, at Ewikon's Technical Center located in Rockford, IL. The one-day event will feature technical presentations from both companies as ...
Mon, 28 Jul 2014 05:56:15 -0700

Its product line of well over 10,000 standard part numbers includes wear plates, wear strips, bushings, gibs, parting line locks, lifter slides and related items. SelfLube's full product line can be viewed on the company's website along with cad models ...

TV Equals

TV Equals
Tue, 05 Aug 2014 05:33:45 -0700

A realization is on its way, especially after crossing so many lines in this week's episode (the kiss with Travis and parting line to Regina) – let's hope it comes soon. Angelo's life insurance is paying for Melody's project, and we can be almost ...

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