Causes and solutions for bubbles and voids in transparent plastic injection molding
Defects in molded products will hurt your bottom line. Bubbles and voids are a common problem and can be avoided by adjusting a few issues:
(1) The melt temperature is too high. The molding temperature should be appropriately lowered.
(2) The injection pressure is too low. Should be properly improved.
(3) The boost time is too short. Should be extended appropriately.
(4) The holding time is too short. Should be extended appropriately.
(5) The mold temperature is too low. Should be properly improved.
(6) The raw material is poorly dried. Pre-drying should be carried out and the drying temperature should be increased, and the drying time should be extended.
(7) There are obstructions in the flow channel. It should be completely removed.
(8) The cooling time of the product in the mold is too long. Should be properly shortened, it is best to put the demolded product in a hot water bath- Slowly.
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An injection molding machine is the main molding equipment for making thermoplastic or thermosetting plastics into plastic products of various shapes by using plastic molding molds.
How an injection molding machine works
The working principle of the injection molding machine: utilizing the thrust of the screw (or plunger), the plasticized molten state (i.e., the viscous flow state) of the plastic is injected into the closed cavity, and the process of obtaining the product after curing and setting is obtained.
What is a hydraulic injection molding machine?
The hydraulic injection molding machine is an injection molding machine that controls the flow direction or flow of high-pressure hydraulic oil pumped from a hydraulic pump through a hydraulic valve to drive a hydraulic cylinder piston rod or a hydraulic motor to complete linear reciprocating or rotating motion.
What are their characteristics?
Use a variety of clamping mechanism forms
Injection forming range is large
Price is lower
Technology is mature and easy to maintain
Suitable for where to use, or what use
Suitable for a wide range of molding products, to meet the processing requirements of more products.
What is an electric injection molding machine?
The all-electric injection molding machine refers to the various mechanisms of the injection device (ejection, metering, and table movement) and the various mechanisms of the mold clamping device (type opening, clamping, and product ejection) all rely on the servo motor. Drive.
What are their characteristics?
Injection performance is stable. The dynamic technical parameters of the all-electric injection molding machine are basically free from external factors, and the mold forming parameters of the computer storage always conform to the actual molding conditions, so the injection performance is stable. The accurate response to injection molding parameters.
Energy-saving. Energy saving is the biggest advantage of electric injection molding machines. Since the servo motor is directly driven according to the required force of each actuator, not only the efficiency is improved, but also the energy utilization rate is improved, and the energy utilization rate can reach 95% or more so that the energy consumption of the full hydraulic injection molding machine is 25% to 60%
Water. Since the all-electric injection molding machine does not use hydraulic oil, only the cooling water is required at the feeding port, so the cooling water usage can be reduced by 70% compared with the hydraulic injection molding machine that loads the sensitive pump, and the ordinary quantitative pump hydraulic injection molding machine Compared to cooling water can be reduced by 90%
High efficiency. Since each actuator of the electric injection molding machine is driven by an independent servo motor and is not affected by the system, it can perform a compound action, can be simultaneously ejected during the mold opening process, and can be simultaneously clamped during the plasticizing process. , which greatly increases productivity.
optimize the working environment. Since the hydraulic fluid is not used, the working environment can be kept clean and the noise of the machine can be more than 10 dB lower than that of the full hydraulic injection molding machine. While optimizing the working environment, the injection molding machine’s floor space was saved by 15% due to the cancellation of the hydraulic system.
Suitable applications:
With the advantages of high speed, high efficiency, and high precision, the all-electric injection molding machine is more suitable for processing high value-added products such as electronic, electrical, and high-clean medical products, especially for injection molding of small parts.
What is a hybrid injection molding machine?
Hybrid injection molding machines generally refer to hybrid electric injection molding machines:
What are their characteristics?
Energy saving
High precision
Clean, low noise
Wide speed control range and good responsiveness
Suitable applications:
It is especially suitable for small products and short injection strokes. It is very beneficial to produce medical supplies with high cleanliness requirements.
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