Asked By: Graham Jackson Date: created: Mar 29 2022
How do you prevent jetting in injection molding
Answered By: Miles Harris Date: created: Mar 29 2022
To avoid jetting, mould geometry and process conditions have to be altered to induce laminar flow within the cavity, filling from the gate end as an unfolding melt front rather than an uncontrolled jet of melt. Reducing overall injection speed will help.
Asked By: Anthony Patterson Date: created: Jun 03 2021
How do you control flow marks in injection Moulding
Answered By: Julian Stewart Date: created: Jun 06 2021
Ⅲ. Countermeasures
- Increase the nozzle diameter. Increase the nozzle temperature.
- Increase injection speed.
- Increase injection pressure.
- Raise the cylinder temperature.
- Reduce the cushion. (Reduce the charging amount.)
Asked By: Charles White Date: created: Mar 14 2022
What causes voids in injection molding
Answered By: Ian Adams Date: created: Mar 16 2022
Voids form when the outside layer of the part cools faster than the inner layer of the part. This causes the inner layer of the part to basically pull-apart causing the void to form. While good part design dictates having a uniform wall thickness, sometimes thicker walls cannot be avoided.1 Aug 2018
Asked By: Adam Wood Date: created: Jun 05 2022
What is splay in injection molding
Answered By: Connor Butler Date: created: Jun 06 2022
Splay is a term used in the manufacture of injection molded plastics to refer to off-colored streaking that occurs when moisture is caught in the material feed, or if the material degrades during processing. That degradation creates a gas, which is the cause of splay.
Asked By: Jaden Morris Date: created: Apr 05 2022
How do you fix short shot injection molding
Answered By: Logan Cox Date: created: Apr 07 2022
Remedies
- Avoid hesitation.
- Eliminate air traps.
- Increase mold and melt temperature.
- Increase ram speed.
- Change the part geometry.
- Use a different material.
- Increase the maximum injection pressure for this part.
19 May 2015
Asked By: Neil Gonzales Date: created: Apr 06 2022
How do you control air bubbles in injection molding
Answered By: Gregory King Date: created: Apr 08 2022
By using a hot air gun or small lighter, warm the area of the part that has the bubble until it begins to soften up. If the bubble expands, you’ve got a gas pocket. If the bubble collapses, it’s a vacuum void.5 Feb 2014
Asked By: Alan Green Date: created: May 11 2022
How many types of injection Moulding are there
Answered By: Geoffrey Sanchez Date: created: May 12 2022
two
Asked By: Elijah Hayes Date: created: Apr 01 2022
What is injection molding process
Answered By: Hugh Hayes Date: created: Apr 01 2022
Injection molding is the most commonly used manufacturing process for the fabrication of plastic parts. The plastic is melted in the injection molding machine and then injected into the mold, where it cools and solidifies into the final part.
Asked By: Michael Griffin Date: created: Jun 18 2021
What is injection speed
Answered By: Geoffrey Griffin Date: created: Jun 20 2021
While molten plastic is flowing in a mold, the machine controls the moving speed of the screw, or injection speed. Injection Pressure: The pressure on the face of the injection screw or ram when injecting material into the mold, usually expressed in PSI.4 Mar 2019
Asked By: Alejandro Mitchell Date: created: Jul 07 2021
What is weld lines in injection molding
Answered By: Reginald Howard Date: created: Jul 08 2021
In manufacturing, the Weld line or Knit line or Meld line is the line where two flow fronts meet when there is the inability of two or more flow fronts to “knit” together, or “weld”, during the molding process. These lines usually occur around holes or obstructions and cause locally weak areas in the molded part.
Asked By: Keith Wright Date: created: Aug 10 2021
What is a short shot in injection molding
Answered By: Rodrigo Henderson Date: created: Aug 12 2021
A short shot is the incomplete filling of a mold cavity which results in the production of an incomplete part. If a part short shots, the plastic does not fill the cavity. The flow freezes off before the flow paths have completely filled.27 Mar 2017
Asked By: Reginald Williams Date: created: Apr 05 2022
What is sink mark in injection molding
Answered By: Diego Sanders Date: created: Apr 05 2022
Sink marks in injection molded plastic parts develop when material in the region of thick features such as ribs or bosses shrinks more than the material in the adjacent wall. Differential rates of cooling result in a depression on the adjacent surface that is known as a sink mark.7 Jan 2004
Asked By: Sebastian Patterson Date: created: Dec 10 2021
Where does the air go in injection molding
Answered By: Ashton Jenkins Date: created: Dec 13 2021
Air is present in the space in the cavity of a mold. In injection molding, molten plastic is poured inside the cavity, that is, it is also possible to say that the process is that of replacing air with molten plastic.3 Dec 2010
Asked By: Walter Nelson Date: created: Jul 30 2021
How do I get rid of bubbles on my screen protector
Answered By: Fred Foster Date: created: Jul 30 2021
Flatten the protector with the credit card all the way to the edge to force the air bubbles out. When the bubbles reach the edge of the screen, slightly lift up the side of the protector for the air to be released. Continue pressing the screen protector until the bubbles are gone.
Asked By: Antonio Howard Date: created: Feb 15 2022
How do I get rid of bubbles
Answered By: Isaiah Hernandez Date: created: Feb 17 2022
Instead, use a heat gun or something similar. Then as you gently warm the area of the part where the bubble is, the bubble should change form. If it is a gas bubble, the gas will warm up and expand, raising the surface, and often will pop as the part surface softens.31 Mar 2015
Asked By: Thomas Torres Date: created: Mar 17 2021
What is injection molding used for
Answered By: Jack Bailey Date: created: Mar 17 2021
Injection molding is a manufacturing process commonly used for fabricating items from plastic trinkets and toys to automotive body parts, cell phone cases, water bottles, and containers. Essentially many of the plastic parts that we use in every-day life are injection molded.22 Mar 2018
Asked By: Jack Gonzalez Date: created: May 26 2021
What are the stages of injection Moulding
Answered By: Alex Henderson Date: created: May 26 2021
These stages are the clamping, injection, cooling and ejection stages.
- Clamping. Before the mould is injected with material, both halves of the mould have to be closed.
- Injection. Plastic pellets are fed by means of a hopper into the injection moulding machine.
- Cooling.
- Ejection.
24 Jul 2013
Asked By: Cameron Gray Date: created: Nov 14 2021
What is the principle of injection Moulding
Answered By: George Rivera Date: created: Nov 16 2021
The principle of injection molding is very simple. The plastic material is heated above its melting point, resulting in the conversion of the solid polymer to a molten fluid with a reasonably low viscosity. It is then forced into a closed mold that defines the shape of the article to be produced.
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