Svejselinjer
De flydende defekter på produktoverfladen eller de lineære defekter, der er forårsaget, når smeltefronter møder hinanden efter opdeling.
Svejselinjer refererer til de linjer, der forekommer på en plastproduktoverflade, når den kolde snegl smelter. I områder med formhulrum, hvor den smeltede plast møder skær eller huller, områder med inkonsekvent strømningshastighed/strømafbrydelser, hvor flere strømninger mødes, eller når der sker sprøjtning under formfyldning, lineære svejsemærker har en tendens til at forekomme på grund af ufuldkommen binding. The existence of weld lines greatly compromises the mechanical strength of a product. The solution for overcoming weld lines is similar to that for reducing product sagging. Weld lines can be caused by many reasons, which covers the various aspects of mold, behandle, raw materials and product design, etc.
(1)Injection Machine
Poor plasticization and non-uniform melt temperature – appropriately extend the injection molding cycle, to ensure thorough plasticization, and change for a machine with a larger plasticization capacity when necessary.
(2)Skimmelsvamp
①Mold surface is too cold – appropriately raise mold temperature or purposefully increase the local temperature at melt joints, to restrict cooling speed.
②Runner is too thin, narrow or shallow, and cold slug well is too small – increase runner dimensions, improve runner efficiency and at the same time enlarge the area of the cold slug well.
③Increase or reduce the sectional area of the gate, and change gate location. Gate and runner are too small – increase gate size and runner diameter; gate is too far away from the welding area – need to change gate location or add dozzle(s); when deciding gate location, try to keep the melt from flowing around inserts or holes. When jetting occurs, the gate needs to be fixed, relocated or equipped with blocking buffers. Og, try to avoid the application of multiple gates.
④Insufficient mold venting or no vent at all – set up, expand or clear the vents, including venting through insert and ejection pin clearances, setting up vents in welding areas or increasing vent dimensions.
⑤Too much detergent is used – try not to use release agent.
⑥Plastic part is too thin in the welding area – need to modify mold and thicken the area.
(3)Sprøjtestøbningsproces
① Effective cavity pressure is too low – need to increase injection pressure and injection time.
②Increase injection speed. A high injection speed allows the molten plastic to reach the meeting point before cooling, while a low speed allows sufficient time to let cavity air out.
③Raise melt temperature or nozzle temperature; when the temperature is high, the plastic will feature a low viscosity and good fluidity, thus resulting in slighter weld lines; when the temperature is low, decomposition of gaseous substances can be reduced.
④Try not to use release agents, esp. those containing silicone, or the flows will not be able to bond perfectly.
⑤Reduce clamping force to ensure good ventilation.
⑥Appropriately increase back pressure and adjust screw speed, so as to ensure a uniform melt temperature; increase the screw speed to lower plastic viscosity; increase back pressure to improve plastic density.
(4)Råmateriale
①Ensure the raw materials are sufficiently dried. Dry the raw materials and try not to use liquid additives.
②Improve fluidity. For plastics that feature poor fluidity or high heat sensitivity, lubricants and stabilizers should be appropriately applied; choose materials with good fluidity and high thermal resistance when necessary.
(5)Product Design
①Small thickness – increase the thickness to avoid premature solidification.
②Inappropriate insert location – make appropriate adjustments.
Om JasonMould Industrial Company Limited
Jasonmould er en Kina mold maker af plastforme- sprøjtestøbeform, formstøbning forme, plastblæsestøbning, rotationsstøbning, medicinsk plast sprøjtestøbning, to skud plast sprøjtestøbning, indsatsstøbning, overformning, metal sprøjtestøbning, mikro sprøjtestøbning, pulverformsprøjtning, keramisk sprøjtestøbning, flydende sprøjtestøbning, husky sprøjtestøbning, husholdningsskimmel, støbeform, formværktøj, brugerdefinerede forme, porcelæn forme, værktøj til hurtig prototyping, værktøj til prototyper i plastik, slagpresseværktøj, dør og værktøj til mobiltelefon/ mobiltelefondele, bildele, støvsugere, genopladelige værktøjer, telefoner, kopimaskiner, computere, multimediehøjttalere, og mange andre elektroniske produkter og husholdningsapparater. Og også en plastproduktproducent, skimmel producent Kina- plastikdele, vandtank i plast, plastik bolde, plastbeholdere, plastspænde, plastanker, plast bøjle, plastske, rørledning i plast, tumlet plast, bordservice i plast, plastik kopper, plastik flasker, plastbakke, kosmetisk beholder af plast, plastkasse, madbeholder i plast, plaststole, plastikkapper, lukning af plasthætte, plastrør, vandrør i plast, plastik knapper, plastrør, brugskasser i plast, plaststativer og så videre.
Kontakt:
Person: James Yuan
Selskab: JasonMould Industrial Company Limited
Tilføje: LongGang Village,LongXi Town,BoLuo County,HuiZhou City,GuangDong-provinsen, Kina
Tlf: 86-752-6682869
E-mail: [email protected]
Websted: https://www.jasonmolding.com/company/
