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A parting line, or seam 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]


Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Parting_line — Please support Wikipedia.
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330 news items

X17 Online
Wed, 29 Jul 2015 11:56:15 -0700

After the male anchor suggested that British beauty was tired and seemed to be in a foul mood, they abruptly ended the interview with this parting line! "We'll let you go take a little nap, maybe get a Red Bull, how about that?" and then cut the feed ...
Wed, 08 Jul 2015 02:45:00 -0700

Annalisa Merelli on former Greek finance minister Yanis Varoufakis's most memorable moments. “In a post on his blog, titled 'Minister No More!' Varoufakis announced his decision in his classically no-nonsense tone. His parting line: 'I shall wear the ...

Plastics Technology

Plastics Technology
Wed, 01 Jul 2015 08:11:10 -0700

This month I will get into venting components and touch base at the end on parting-line bearing surface. Venting of mold components, actions, and part details at times is overlooked as a root cause of mold problems such as deposit buildup and erosion, ...

Plastics Technology

Plastics Technology
Wed, 01 Jul 2015 12:52:30 -0700

The valve pins move at right angles to the mold parting line. It's available with one, two, and four drops per nozzle, allowing for compact, high-cavitation layouts (see photo). Multi-drop nozzles have a single pneumatically actuated pin to open and ...


Sun, 24 Aug 2014 22:31:12 -0700

First of all, the location of the parting line determines the direction of mold opening and, consequently, the direction in which features must be drafted for easy ejection. Second, it affects where any vestiges left by the mating surfaces of the mold ...
Packaging Today
Mon, 06 Jul 2015 05:56:15 -0700

The design created challenges due to the cross corner parting line split, and the highly functional ergonomic hand grips moulded on the back side of the bottle. This was overcome by a variable radius parting line that allowed the part to release from ...

Plastics Technology

Plastics Technology
Mon, 25 May 2015 14:00:00 -0700

Let's start with the most common type, parting-line vents. The old standard for parting-line vent design was to take a cutter, typically 0.250 to 0.500 in., and cut the relief of the vent to within 0.250 in. of the cavity. Typically a vent would be cut ...

Entertainment Weekly (blog)

Entertainment Weekly (blog)
Mon, 02 Mar 2015 06:21:46 -0800

She's a nurturing big sister who leads by example, and at going-on-17 years old, she's pretty cool about the fact that the highlight of her social life is an expensive puppet show. But then again, Rolfe. Parting line: “I'd like to stay and taste my ...

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