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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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328 news items

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 ...

Huffington Post

Huffington Post
Tue, 23 Jun 2015 06:30:00 -0700

Cams allow for parts of the mold to move perpendicular to the parting line. These extra parts have to meet perfectly, in order for the parts to be molded properly. It is easy to tell what direction the two halves of the mold pulled apart from the round ...


Tue, 23 Jun 2015 01:21:23 -0700

... world," Lyon said. "It's just being able to have that variation of going up the gears and down the gears, so I'm not going to change too much. "I know what works for me and I'm going to back myself." It's a parting line of which Warne would have ...


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 ...

Irish Independent

Irish Independent
Sun, 07 Jun 2015 18:33:14 -0700

Dettori, whose parting line from Gosden beforehand had been to "be cool, take your time", launched his mount a furlong out. The response was emphatic. As ever, which way Golden Horn goes from here is impossible to predict. Winning a Derby invariably ...
Powder Metallurgy Review | ipmd.net
Tue, 09 Jun 2015 06:37:15 -0700

The catcher receives a grinding and burnishing to attain the OD tolerance and surface finish, while the tension bar needs only a turning operation to form an external thread without a parting line. The parts were formerly produced via machining ...


Wed, 10 Jun 2015 06:30:00 -0700

Thanks to precise temperature control and an innovative process design, this gating system ensures that the molten metal remains liquid up to the parting line level. By retaining a minimum of sprue residue as well as the gate, proven and tried ...

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