Excessive ash content. When the molten material flows from the thin wall to the thick wall, it expands. Weld line defects - also known as knit lines - is a defect that occurs when the injected plastic meets within a mold. #. Making the cylinder temperature lower. The main cause of defects is the interference of gases (mainly water vapor, decomposition gas, solvent gas, air). These include profile and sheet extrusion and coextrusion, injection molding , structural foam molding , and extrusion-blow. For example: 1) Material is not dry enough, masterbatch also need to be dry. Replace raw materials or use plastics with good thermal stability. Now we will cover short learning about plastic injection molding process. CMT333-4595 Hinges for 45/9.5 Blum , Salice, Hfele and Hettich. Additive, filler and reinforcement effect on polymer property. Silver Streaks in injection molded parts include surface bubbles and internal pores. 1. Splay is a cosmetic defect that occurs in plastic injection molding, sometimes we also call it "silver streaks" because of the appearance of silvery scratches across the . Weld line section presents notch or gloss difference. 3. About this video Define silver streaks And their cause and remedies 1. silver streak boleh terjadi kerana resin yang digunakan mengandungi kelembapan atau basah. + Adjust injection speed. In places where the plastic flows around a solid piece of the mold, from a simple circle to forming complex shapes like rings or squares . 4. The specific reasons are as follows: Machine Aspect. 2. (1) The barrel, the screw wears or the rubber head and the apron have a dead angle of material . This is not only time-consuming but also requires additional energy consumption and cost. + Improve vent inside the mold. 2. Next, we first look at the causes of silver streaks: plastic mold materials and water vaporization of volatile liquid materials; decomposition; shearing. Preview. The material temperature is too high, which causes decomposition. This is the most important countermeasure. 1. 3) Melt temperature not to be too high. As the polymer resin is injected into a mold, it flows through all parts of the mold. Injection Molding Machine. This study investigates whether silver streak can be minimized and improved by . 3. Contact Me Now! Making the injection speed lower and filling the cavity slowly. + Move gate (to where it is not visible). These can be considered external appearance quality defects in exterior parts of consumer electrical products, automobiles, motorcycles, etc. 10 Best Hettich And Hafele Blum : Editor Recommended. Injection Molding Basic study with Molding Defects. Plastic pellets contain a certain percentage of moisture. Hickory comes in second, scoring just under 2000 lbf. 2. Basket Sets, Vauth-Sagel VS COR Flex - Hfele Ireland Shop Address. 1. III. Silver streak troubleshooting of injection molding. Processing: ASA resins can be processed by most conventional methods. The mold leaks oil, water, and air into the mold cavity, which easily causes silver streaks on the part surface. Besides, some useful solutions have been put forward to help you, 1. Plastic products will sometimes appear silver streaks in injection molding machine production in the process of forming the phenomenon, so how do we deal with it. The volatiles vaporize and contact with the surface of the mold and become silver. tahap pengeringan bergantung pada jenis resin yang digunakan 2. silver streak boleh juga terjadi kerana suhu heater pada nozzle terlalu . If the barrel temperature is too high or the heating is imbalanced, the barrel temperature should be lowered step by step. We will cover following points in this post:-. 1. There is a list of things to look at when you do troubleshooting on silver streaks. data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAKAAAAB4CAYAAAB1ovlvAAAAAXNSR0IArs4c6QAAAnpJREFUeF7t17Fpw1AARdFv7WJN4EVcawrPJZeeR3u4kiGQkCYJaXxBHLUSPHT/AaHTvu . + Increase mold temp, or materials' temp, or holding pressure. What is silver streaks in injection molding? Buy on Amazon. Therefore, drying operation before molding is an indispensable requirement. Checking the preliminary drying conditions (temperature, drying time) of the molding material, and carrying out appropriate drying. Reduce ash content. During injection molding, the moisture appears as silver streaks on the molded part surface. Product. It earns a Janka hardness rating in excess of 2500 pounds-force. Molding Machine operating sequence. Very Hard - Next in order comes a cluster of six hardwood stalwarts: Maple, White Oak, Ash, Beech, Birch and Red Oak.All achieve Janka scores between 1200 to 1500 lbf. 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