There are three classes of bottle defects. This topic was covered when I attended a seminar at PTTC.
Class A. Critical defects which prevent the glass jar form performing their intended function of safely holding the product. It may cause danger to consumer.
- Cracks anywhere in the jar.
- Broken of chipped finish.
- Contamination with dirt, insects, or any other foreign matter that cannot be easily removed by washing before filling.
Class B. Major defects that makes handling of jar difficult. Bottle durability is questionable.
- Glass weight is below specified minimum.
- Dimensions for height, diameter, volume or finish are outside tolerance.
- Leaners (deviation form verticality) in excess of specified tolerances.
Class C. Minor Defects which adversely affect the appearance but not the function of the jar.
- Uneven outer surface.
- Slight off-color glass.
- Rough mold lines.
Specific Glass Defects
1.Offset finish 2.Split finish 3.Bulged finish 4.Chipped finish 5.Checks under finish 6.Overpress 7.Corckage Check 8.Seam on side finish 9.Checked finish 10.Crizzled finish 11.Down finish 12.Out-of-round finish 13.Dirty finish 14.Threads not filled out 15.Tear under finish 16.Bent or crooked finish 17.Rough finish 18.Broken finish 19.Neck ring seam 20.Bent neck 21.Choked neck 22.Long neck 23.Hollow neck 24.Dirty neck 25.Pinched neck 26.Shoulder check 27.Thin shoulder 28.Sunken-shoulder 29.Hot checks 30.Pressure checks 31.Mold and Blank seams 32.Light sides 33.Bird Swing 34.Bruise checks 35.Letter checks 36.Flanged bottom 37.Light bottom 38.Heavy bottom 39.Rocker Bottom 40.Baffle Mark 41.Checked Bottom 42.Heel tap 43.Spikes 44.Washboard 45.Brush marks 46.Stones 47.Busters 48.Seeds 49.Cords 50.Black spots 51.Shear marks 52.Oil marks 53.Broken ware 54.Loading marks 55.Drag marks 56.Wrinkles or laps 57.Out-of-shape ware 58.Uneven distribution 59.Wavy appearance 60.Dirty appearance
This is in response to ashley… the defect in the beer bottle that you have is called a spike…
hi…i have an old beer bottle with a string of glass inside the bottle, at the bottom stringing from one side to the other..like a u shape. deff a factory defect could of killed sumone!! please let me know if this sounds familiar to u as i am looking to sell this piece!! thank you
No i am not familiar with it. How much would you like to sell that? Can you send me a picture. Thanks!
I have Ball jars with defects…one a birdswing….are they worth anything…..thanks
would you mind sending me a good quality picture?
I woud like to now about the glass defect : Bird Swing.
What the principal cause for this defect ?
This article excerpt has a good explanation about bird swing. Hope it helps!
The detection of the defect in glass containers known as a “bird swing” has been a continuing problem in the art. This defect is most prevalent when forming glass containers in the shape of flasks. The “bird swing” defect is a result of the two sides of the bottle contacting each other during the formation of the parison and prior to the blowing of the container into its final shape. As would be expected, when the two sides of the container touch, the hot, relatively “tacky” glass will fuse and as the container is expanded by air under pressure being introduced thereinto, the sides that have touched will move away from each other drawing a small thread of glass therebetween, thus forming what is termed a “bird swing”. http://www.freepatentsonline.com/3662883.html
Hi, could you tell me please where can I read about glass containers defects? Are there any books or articles about defects?
Thank you
Jarek
I have never seen any books about it. Articles on-line are rare either. Try looking for Food Packaging Seminars – they can provide you with good knowledge and lot of resources.