Published: TONGCHUANG MACHINE
As a professional 7 layer die head manufacturer, we often receive inquiries from customers who want to understand the working principle behind this core component of multi-layer co-extrusion blown film equipment. The 7 layer die head is not only the key part that determines film quality but also the most technically complex structure in the entire production line. By explaining its principle clearly, users can better operate equipment, select materials, and maintain stable production of high-barrier composite films.
The working principle of the 7 layer die head starts with the simultaneous feeding of seven different plastic melts from independent extruders. Each melt enters a special flow channel inside the die head, and these channels are carefully designed through fluid simulation to ensure stable pressure, uniform speed, and no turbulence or mixing between layers. The seven layers of materials pass through their respective channels in a strict order and gradually converge at the lower part of the die head to form a complete composite melt tube. This precise convergence process ensures that each functional layer maintains its respective thickness and position without displacement or delamination.
A major technical advantage of the
7 layer die head is its layered independent control capability. Different materials, such as barrier resin, bonding layer, heat-sealing layer, and recycled material layer, can be arranged flexibly according to product needs. The die head's internal spiral or distributor structure ensures that each layer spreads evenly in a circular shape, so the film tube formed after extrusion has consistent thickness and stable performance. This structure is especially important for food packaging, pharmaceutical packaging, and electronic films that require high oxygen and moisture barrier properties.
In actual production, the 7 layer die head also relies on precise temperature control and pressure balance to maintain stable operation. Temperature is adjusted separately for different flow channels to match the melting characteristics of each material, while the overall pressure inside the die head is kept balanced to avoid film breakage or uneven wall thickness. Professional manufacturers optimize the structure of the 7 layer die head to reduce material retention, prevent carbon deposition, and make cleaning and color switching more convenient, which greatly improves production efficiency.
In short, the 7 layer die head realizes the stable composite forming of seven material layers through precise runner design, scientific convergence technology, and reliable temperature and pressure control. It is the core component that determines the performance of multi-layer co-extrusion film equipment. For users, understanding this principle helps to make reasonable use of materials, adjust process parameters, and maintain equipment, so as to produce high-quality films efficiently. As a professional 7 layer die head manufacturer, we always adhere to precision manufacturing and technical innovation to provide reliable core components for the high-end film industry.
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