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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]

References[edit]



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

Monroe News Star

Monroe News Star
Sun, 23 Aug 2015 09:30:00 -0700

We don't want people to think any amount of coffee is good. Everything is in moderation.” The general parting line across time, Olson said, has been about two cups of coffee. “If you have three, is that going to kill you? No,” she said. “If you drink ...

Sydney Morning Herald

Sydney Morning Herald
Tue, 25 Aug 2015 00:39:00 -0700

... me and my brothers," he said at the start, adding the trip was worth it to be with old mates and have breakfast with Mr Abbott and Chief of the Defence Force, Air Chief Marshal Mark Binskin. "We were proud to do our bit for our country," was his ...

Montgomery Advertiser

Montgomery Advertiser
Mon, 17 Aug 2015 16:03:45 -0700

The general parting line across time, Olson said, has been about two cups of coffee. “If you have three, is that going to kill you? No,” she said. “If you drink less than two, do you not get the benefits? No. If you're having super strong coffee, you ...

Entertainment Weekly

Entertainment Weekly
Tue, 04 Aug 2015 07:48:45 -0700

UnREAL wrapped up its first season with nary a happy ending to be found, as Quinn (Constance Zimmer) and Rachel (Shiri Appleby) burned Everlasting to the ground, only to be sucked back into the show's grasp. We talk with executive producers Marti ...

Design ENGINEERING

Design ENGINEERING
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 ...

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 ...

Huffington Post

Huffington Post
Tue, 23 Jun 2015 06:36:24 -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 ...
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