This is where you have a runner balance, meaning that when the melt is introduced, it should fill all cavities at the same time and equally. If this is not the case you will get some cavities under pressurized (burrs, oversized) while other cavities being underfilled (shrinkage marks, low strength) directly affecting the uniformity of the parts.
Q3: Is it okay to use regrind coming from cold runner systems at 100%?
You cannot use 100% regrind material. The polymer chains might break up after going through one thermal cycle, which alters the mechanical properties. The best practice is to not use more than 20%-30% regrind. JS Precision will be able to advise on a suitable ratio based on the particular requirements of you product.
Q4: What are the major drawbacks of hot runner systems?
The primary issues are runner leakage and material degradation by heat. Runner leakage is usually the result of incorrect assembly or thermal expansion calculations, causing damage to the mold. When the material stays for a long time in hot runner it may break down, forming black spots. You should pick a trustworthy manufacturer (Husky INCOE e.g), and having accurate temperature control as well is vital.
Q5: How does JS Precision help shorten injection molding cycle time?
By minimizing runner size and gate geometry to lower injection pressure, and utilizing flow analysis to precisely establish the minimum cooldown of the parts, JS Precision can reduce the molding cycle time without compromising the quality. If you upload your drawings, JS Precision will get back to you very quickly with a quote.
Q6: Can JS Precision create proper gate design for materials with very high fill content (e.g. 50% glass-fill)?
Of course. Employing a big gate decreases shear rate prevents glass fiber breakage. The gate placement is such that it does no direct impact to the core or thin - walled regions preventing warpage by uneven fiber orientation.
Q7: What is Gate and Runner DFM service process at JS Precision usually?
The service includes:
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Customer delivers a 3D model + material/production requirements.
Engineers run flow analysis.
DFM report is issued, with gate location, runner layout, dimensions, and risk analysis.
The technical review confirms the solution.
The final design optimization and mold manufacturing commence.
Q8: What is the way to obtain a tailored quote or presentation from JS Precision for a particular this project?
Send your 3D drawings, the type of materials you want to use, and the anticipated number of annual production. JS Precision's team will give you the technical and commercial proposal, and a DFM analysis, a mold cost analysis, and a molding trial plan within one business day.
概要
Gates and runners are integral parts of a part that affect its final characteristics, as well as production costs and project schedules. A whole series of decisions, ranging from the gate type, runner balance, and the use of cold-hot runner system, need an engineering know-how and are backed by some data. JS Precision offers gate and runner DFM service that offers a professional level of support at your gate and runner DFM decision.
Contact JS Precision's engineering team immediately to provide professional gate and runner DFM services for your project with our DFM experience and CAE technology. Submit your design documents and receive a free DFM evaluation report with deep engineering value, taking the first step towards efficient and high-quality injection molding production.
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