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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]

References[edit]



Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Parting_line — Please support Wikipedia.
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Updated - Mold Making Casting Complex Parts w/ parting line)

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proe creo mold cavity tutorial make parting line for cover plastic part made by: hoi hoang viet-mechvn.org.

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26 news items

 
New York Times
Wed, 23 Apr 2014 17:05:00 -0700

“What I love about this, other than the proportions and industrial materiality,” he said, “is the wheel that holds the roll of tape. You can see how the mold pulls apart in the center, you can see the parting line inside each spoke. It's a beautiful ...

Cornell University The Cornell Daily Sun (blog)

Cornell University The Cornell Daily Sun (blog)
Mon, 21 Apr 2014 22:03:45 -0700

He's visibly taken aback by the sincerity of her parting line, “Happy Valentine's Day. I love you,” but hey, let's hold out some hope for an evolving father-daughter team. I like it much better than the prospect of a Sally and Betty dynamic duo. While ...
 
Valley News
Tue, 08 Apr 2014 22:03:45 -0700

A dinner guest with long gray hair excuses himself from post-dessert conversation with a scandalous parting line jokingly delivered with one foot in the past and one in the present: “I'm not an advocate for this marriage. I tried to tell them not to ...

WISC Madison

WISC Madison
Wed, 26 Mar 2014 07:26:15 -0700

Heck, you've probably used one or two of them yourself as a parting line ... Gloria Swanson in Sunset Boulevard. No. 5: "All right, Mr. De Mille, I'm ready for my close-up". "Sunset Boulevard" is director Billy Wilder's cynical examination of where ...
 
Washington Post
Mon, 07 Apr 2014 10:56:31 -0700

A dinner guest with long gray hair excuses himself from post-dessert conversation with a scandalous parting line jokingly delivered with one foot in the past and one in the present: “I'm not an advocate for this marriage. I tried to tell them not to ...

Telegraph.co.uk

Telegraph.co.uk
Sat, 29 Mar 2014 00:07:30 -0700

Her parting line was always the same: “Be a good boy.” It made not a jot of difference that I was now in my fifties. On this Mothering Sunday I remember her with fondness and gratitude, even if, on occasion, I may have fallen short in her expectations.
 
PR Web (press release)
Thu, 03 Apr 2014 11:00:00 -0700

Its high hardness makes it perfect for the manufacturing of plastic molds that require good parting line retention and sealing between colored resins. Special melting and forging practices result in 420 having a ultra-high microcleanliness and a ...
 
Philippine Information Agency
Tue, 01 Apr 2014 02:56:04 -0700

But I will come back before leaving office to insure a fully operational hospital,” Ona declared as a parting line in his brief speech, which he began by saying he felt a “very close kinship with Maasin.” Earlier, Gov. Mercado, in his welcome talk ...
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