今年橡塑展，精诚圆模展台的人潮比往年更盛。走近一听，客户们抛出的每一个问题，都带着产线上真实的“卡顿”。他们要的，不是“更厚的膜”，而是更轻、更强、更省成本、更好回收的膜。多层共挤，已经从“可选项”变成了“必答题”。
This year at CHINAPLAS, JCTIMES Booth 3A26 for circular dies drew an even larger crowd than in previous years. Step closer, and you could hear that every question raised by customers came straight from real bottlenecks on the production line. What they are looking for is not simply “thicker film,” but film that is lighter, stronger, more cost-efficient, and easier to recycle. Multi-layer co-extrusion is no longer an option; it has become a necessity.
01 让不同材料“各走各路”
Allow each material to follow its own flow path.
一位做七层农膜的客户在中心进料式锥面叠加模头前停下来，反复打量螺旋流道的走向。他问：“不同材料流变特性差异大，界面会不会出现不稳定？”
A customer producing seven-layer agricultural film stopped in front of the center-feed conical stacked die, carefully examining the direction of the spiral flow channels. He asked, “Given the large differences in the rheological properties of different materials, could interfacial instability occur?”
工程师没有急着解释，而是用手沿着模头的流道方向比划了一下：“您看这个结构——每层螺旋流道是独立叠加的，各走各路，直到模口才汇合。这就避免了不同材料在长距离流动中相互干扰。其次，流道几何形状经过CFD流体仿真反复优化，确保每一层的熔体在汇合点线速度一致。线速度匹配了，界面就不会被‘拉扯’，膜面平整一步到位。至于温差问题，这个模头结构的最大优势是每层温度可单独设定，温控精度±2℃。尼龙和PE的温差不是问题，因为热量不会在层间窜扰。”
The engineer did not rush to explain. Instead, he traced the direction of the flow channels on the die with his hand and said, “Take a look at this structure—each layer’s spiral flow channel is stacked independently, allowing each material to follow its own flow path until they merge at the die exit. This prevents different materials from interfering with one another during long-distance flow. In addition, the channel geometry has been repeatedly optimized through CFD simulation to ensure that the melt in each layer reaches the merging point at the same linear velocity. Once the linear velocities are matched, the interface is no longer subjected to pulling or distortion, and a smooth film surface can be achieved in one step. As for temperature differences, the greatest advantage of this die structure is that the temperature of each layer can be set independently, with temperature control accuracy within ±2°C. The temperature difference between nylon and PE is not a problem, because heat does not interfere across layers.”
02 从源头消除膜泡波动
Eliminate bubble instability at the source.
另一位做食品包装膜的客户在中心进料模芯体组件前停了下来。他问：“我们那台老模头，膜泡总是晃，厚薄偏差大。你们这个结构，怎么保证圆周上出料一致？”
Another customer, who produces food packaging film, stopped in front of the center-feed mandrel assembly. He asked, “Our old die always gives us an unstable bubble and large thickness variation. How does your structure ensure uniform melt distribution around the circumference?”
工程师指着进料口的位置：“您看，各层进料口在同一水平线上，熔体从中心进来，通过辐射状流道向圆周均匀分散。熔体滞留时间短，还没等它‘乱’，就已经流到下一段了。而且我们的流道经过CFD仿真优化，压力分布本身就是对称的，不会一边多一边少。圆周上各点压力一致，膜泡自然稳定，厚薄自然均匀。”
The engineer pointed to the inlet and said, “As you can see, the inlet ports for each layer are arranged on the same horizontal plane. The melt enters from the center and is then distributed evenly around the circumference through radial flow channels. Melt residence time is short, so before the flow has a chance to become unstable, it has already moved on to the next stage. In addition, our flow channels have been optimized through CFD simulation, so the pressure distribution is inherently symmetrical, with no side receiving more flow than another. When the pressure is consistent at every point around the circumference, the bubble remains stable and the film thickness stays uniform.”
03 答案藏在细节里
The answer lies in the details.
从锥面叠加的层间稳定性，到中心进料的圆周均匀性，从模唇尖角的晶点控制，到高压过滤器的杂质拦截——每一个问题背后，都是一条产线上真实的“卡顿”。而每一个答案，都藏在流道设计里、在精密加工里、在±0.01mm的圆度公差里。
更多技术交流，欢迎移步3A26深入探讨。
From interlayer stability in conical stacked die design to circumferential uniformity in center-feed design, from crystal-spot control at the sharp die lip to impurity interception by high-pressure filters—behind every question lies a real bottleneck on the production line. And every answer is hidden in flow channel design, in precision machining, and in roundness tolerances controlled within ±0.01 mm.
For more in-depth technical discussion, welcome to Booth 3A26.
