Table of Contents
How do you fix delamination in injection molding?
Switching to an easier flowing grade of material, if allowed, will often help resolve the delamination problem. Ensure that the material is not contaminated with a foreign, incompatible polymer. Contamination is typically the #1 cause of delamination.
How do you control drooling in injection molding?
The method for the prevention of drooling from a plastic injection molding mold and injection nozzles as claimed in claim 2 characterized in that a plunger of a nozzle touch member provided with a flow passage is slidably inserted into a sprue connected to the hot runner in the injection molding mold, said plunger …
How long does an aluminum injection mold last?
What is the life expectancy of a tool? Aluminum tools are good for a lifespan of anywhere from 2,000- 10,000 parts depending on the type of aluminum used, part material and geometry. Steel tools are good for a lifespan of 100,000 + parts depending on the material and geometry of the part.
What causes delamination in injection molding?
Delamination refers to a flaw where plastic manufactured parts fracture into layers. Shrinkage stresses due to improper curing and cooling can cause cracking that leads to delamination, or faults in the injection molding process or machinery can result in this defect.
How do you solve delamination problems?
Remedies
- Reduce shear stress.
- Remove excessive moisture. Material suppliers can provide optimum drying conditions for the specific materials.
- Reduce regrind material.
- Avoid excessive use of mold release agent.
- Avoid material contamination.
How do you remove flash from plastic parts?
Hot air works well for removing flash that is thin and fine. However, if the flash is too coarse it can be difficult to melt back into the part surface without affecting the look of the finished product. In these cases the flash may need to be mechanically removed before using hot air to smooth the surface.
How do you stop a nozzle from drooling?
A common method of counteracting drool is with mold decompression – retracting the screw to relieve pressure at the nozzle tip. However, this process drops the pressure in the barrel and creates the potential for short shots.
Why is my injection molding machine leaking oil?
If your injection molding machinery is in disrepair or not being correctly operated, oil leaks, dirt, and other matter can get into the plastics. Repairing any oil leaks as quickly as possible and clean up any grease drips as soon as they happen. Always use the hopper lid.
Why is my nozzle tip leaking?
The nozzle tip must form a seal against the sprue bushing so as to withstand high injection pressures with no leaks or injection unit push-back. Here are some causes/remedies of nozzle leaks: Machine specifications usually call out a nozzle contact pressure requirement of 4 to 10 tons of force.
Why does plastic burn in injection molding?
When gases get trapped during mold filling, high pressures can cause ignition, which leads to the plastic burning. Burns in injection molding are, quite literally, burns. To determine the cause of your issue, first determine where the gas is coming from, and then ask why isn’t the gas escaping the mold?
What is the best lubricant for injection molding?
Also, reach for the Cera Lube. Because over-greasing and grease breakdown can cause burning, Nanoplas Cera Lube, which neither breaks down nor bleeds, is the best solution. Feel free to contact us if you have questions about our products and how they might solve your injection-molding problems.