Material, or the decomposition and burning of mixed dissimilar plastics. They radiate outward in a fan-shaped manner from the gate location. Many plastic materials absorb a lot of moisture during storage. In addition, in the plasticizing stage of the raw plastic They are not fully dried before injection molding, the residual water will beĬonverted into water vapor during the plastic injection molding process, thus accordinglyĬausing splatter marks on product surface. Of air cannot be successfully vented during the plastic injection molding process, Material, a certain amount of air is often trapped in the melt. Silver streaks will also be generated on product surface. The most commonly seen form of the silver streak is the needle-like Moreover, someĬracked or burnt plastics will also lead to silver streaks on product surface. For example, the degradation caused silver streaks are smallīubbles that are formed and distributed on the surface of plastic products when Silver-white stripes caused by elongated flat bubbles, of which the main types includeĭegradation caused silver streaks and water vapor caused silver streaks.Īll types of silver streaks are generated by the volatiles precipitatedįrom the melt front. Generated when the water volatilizes cause the surface of the plastic product Is that the water content in the raw material is too high, wherein the bubbles Another example is that the main cause of the water vapor related silver streaks In a “V” pattern, of which the tip faces away from the center of the The marks left by these small bubbles on plastic product surface are arranged Partial thermoplastic degrades and gas decomposes after being heated. If the vapor generated by the volatilization of water in the molten To produce silver streaks, especially true for the super absorbent resins suchĪs PA and HIPS. Raw material, reduce the amount of recycled materials, and remove the residualįoreign materials in the barrel for water vapor caused silver streaks, the raw With a uniform pellet size as much as possible, screen out the powder in the To eliminate silver streaks, we should start from the following threeįirst of all, with regard to raw material selection and processing, toĭeal with degradation caused silver streaks, it is necessary to select resins Plastic cannot be completely vented, the water vapor caused silver streaks willīe produced on the surface of a plastic product. Streaks, the backpressure and screw compression ratio should be increased, while Prevent local overheating of the melt, and slow down the screw speed andįorward speed to shorten the pressurization time for the water vapor caused silver The barrel and the nozzle, reduce the residence time of the melt in the barrel, Second, when it comes to processing and operation, to deal withĭegradation caused silver streaks, it is necessary to lower the temperature of Material must be fully dried according to the requirements of the resin. In the molten plastic, while checking whether the mold cooling channel is For the water vapor caused silver streaks, the mold venting holes shouldīe increased or vacuum vents should be adopted, to minimize the gas remaining Well as the cold slug well should be increased, so as to improve the venting conditions Third, in aspects of mold design and operation, to deal with degradationĬaused silver streaks, the sections of the gate, the sprue and the runner, as The screw speed should be reduced or venting screw applied. I’d prefer not to have to dive into self repair and taking this thing apart right out of the gate since if all these things were missed who knows WHAT ELSE is wrong! The fact there is a 1" wide marred and hazed zone on the optical window with very visible streaks and scratches through it makes me doubt QC dept was on top of its game the day this unit came off the line.Leaking, so as to prevent the mold surface from frost and moisture caused by overcooling. I bought the Form2 because I was tired of messing with problems with the Form1+ and just want to be printing. Wow what a mess and I haven’t even started printing yet. I inspected for dust particles under the glass after cleaning the top surface and there is one rather large mote of white dust near the center of the window, two smaller white ones elsewhere and what appears to be a thin red fiber about 1mm in length near the front left. The streaker device as in claim 3 wherein each elongate strap can flex at least 0.25 cm without breaking the. There was also a 1/2" or so blob of some kind of sticky residue on the other side of the window which I was able to clean off but that is very disconcerting for a brand new $3500 printer. Formz tmaterial streaking along side free. Firstly, you may have overloaded the plate, and if you reduce the amound of material spotted on the baseline, you will. There are several reasons why you may see a streak up the plate. So, the hazing seems to be permanently etched into the glass and is not affected at all by cleaning using the prescribed methods. Sometimes a developed TLC plate may show streaks, crescents or strangely shaped spots, and these are all indicative of different problems.
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