Try these steps to fix injection molding problems.* Here is a do-it-yourself do-it-your·self adj. Of, relating to, or designed to be done by an amateur or as a hobby: do-it-yourself home repairs; a do-it-yourself sailboat kit. guide to solving the 16 most common injection molding injection molding n. A manufacturing process for forming objects, as of plastic or metal, by heating the molding material to a fluid state and injecting it into a mold. process problems in a step-by-step fashion. These are remedies you can try without the more drastic step of pulling the mold mold, name for certain multicellular organisms of the various classes of the kingdom Fungi, characteristically having bodies composed of a cottony mycelium. The colors of molds are caused by the spores, which are borne on the mycelium. from the machine. For each problem in the left column, try adjusting the variables listed across the top row in the order suggested by the numbers in the color-coded icons. Try adjusting the variable up or down as the point of the triangle triangle, in mathematics triangle, in mathematics, plane figure bounded by three straight lines, the sides, which intersect at three points called the vertices. Any one of the sides may be considered the base of the triangle. indicates. In some cases (marked by diamond-shaped Di´a`mond-shaped` a. 1. Shaped like a diamond or rhombus. icons), there is no general rule about whether to raise or lower the value of the variable. So you will have to experiment. The two right-hand right-hand adj. 1. Of, relating to, or located on the right. 2. Relating to, designed for, or done with the right hand. 3. Most helpful or reliable: my right-hand assistant. columns point out two different sorts of factors that should be checked: Are nozzle An orifice in an inkjet print head through which ink is sprayed onto the paper. Print heads with six thousand or more nozzles are common in today's printers. Nozzle heaters functioning properly? Is resin resin, any of a class of amorphous solids or semisolids. Resins are found in nature and are chiefly of vegetable origin. They are typically light yellow to dark brown in color; tasteless; odorless or faintly aromatic; translucent or transparent; brittle, fracturing contamination contamination /con·tam·i·na·tion/ (kon-tam?i-na-shun) 1. the soiling or making inferior by contact or mixture. 2. the deposition of radioactive material in any place where it is not desired. occurring? An 8.5 x 11 in. version of this chart with a protective plastic covering, suitable for posting by the molding machine (Woodworking) A planing machine for making moldings (Founding) A machine to assist in making molds for castings. See also: Molding Molding , is available for free from Teknor Color. By Joe Allbritton Teknor Color Co. Joe Allbritten is senior technical service engineer at Teknor Color Co.'s compounding plant in Jacksonville, Texas Jacksonville is a city in Cherokee County, Texas, United States. The city had an estimated population of 14,402 in 2006. It is the principal city of the Jacksonville Micropolitan Statistical Area, which includes all of Cherokee County and part of the larger Tyler-Jacksonville , which makes color and additive additive In foods, any of various chemical substances added to produce desirable effects. Additives include such substances as artificial or natural colourings and flavourings; stabilizers, emulsifiers, and thickeners; preservatives and humectants (moisture-retainers); and concentrates and precolored compounds. Allbritton has been with Teknor for 25 years as a color matcher, QC technician See PC technician and software technician. , laboratory manager, and in sales and technical service. He may be reached at (903) 586-0583, or e-mail jallbritton@teknorapex.com.
INJECTION MOLDING TROUBLESHOOTING REFERENCE GUIDE
Variahles to Adjust Injection Cycle Injection Sprue/Runner
PROBLEMS Pressure Time Hold-Time Gate Size
Blush at Gate 4A 5A
Brittleness
Color Streaks 8A
Flash 1B 8B
Jetting
Delamination 7B
Poor Dimens. Stability 3A 2A 6A
Poor Surface Finish 1A
Short Shots 2A 7A
Sink Marks 2A 3A 5A
Sprue Sticking 6B 3A 2B 4A
Sticking in Cavity 1B 3A 2B 6A
Warpage 5B 3A 7A
Wave Marks 4A 3A
Weak Weld 4A 7A 6A
Weld Burns 8B 7A
Variahles to Adjust Gate Land Nozzle Adjust Clamp
PROBLEMS Length Opening Feed Pressure
Blush at Gate
Brittleness
Color Streaks 9B
Flash 2A
Jetting 5B
Delamination 6B
Poor Dimens. Stability 4A
Poor Surface Finish 5A
Short Shots 8B 1C
Sink Marks 8B 1C
Sprue Sticking
Sticking in Cavity 4C
Warpage
Wave Marks 1C
Weak Weld
Weld Burns 5A
Variahles to Adjust Stock Mold Injection Screw
PROBLEMS Temp. Temp Speed RPM
Blush at Gate 3C 1A 2B
Brittleness 1B 3A 7B 4B
Color Streaks 2C 3A 1B 5B
Flash 4B 5B 3B 7B
Jetting 2C 3A 1B
Delamination 3A 2A 4B
Poor Dimens. Stability 1C 4C
Poor Surface Finish 2B 3A
Short Shots 4A 5A 3A
Sink Marks 4B 5B
Sprue Sticking 1B
Sticking in Cavity 6B 5B
Warpage 2B 1B 4B
Wave Marks 5B 2B
Weak Weld 3A 1A 2A
Weld Burns 2C 1B 3B
Variahles to Adjust Back Gas Nozzle Contamination
PROBLEMS Pressure Vents Heating
Band
Blush at Gate
Brittleness 5B 6A 2D
Color Streaks 6A 7D 4D
Flash 6B
Jetting 7D
Delamination 1D
Poor Dimens. Stability
Poor Surface Finish
Short Shots
Sink Marks 9A 6A
Sprue Sticking 4D 5D
Sticking in Cavity
Warpage 6B
Wave Marks 6A
Weak Weld 5A
Weld Burns 4B 6A
Check the key variables in the order indicated by the numbers.
A Increase
B Decrease
C Adjust up or down
D Check
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