The hottest Nordson new sealing reinforcement syst

2022-08-14
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Nordson new sealing reinforcement system in the United States can solve the problem of thick edges of polymers

recently, nordsonextrusiondiesindustries in the United States issued a reinforcement system for the fatigue phenomenon caused by the opening of extrusion coating (film coating) die heads and internal plugging width adjustment devices, so that processors can reduce the thick edges while coating low melt strength polymers, while maintaining a uniform coating amount, Effectively improve the production efficiency and profitability of extrusion coating

it is reported that the traditional standard internal blocking width adjustment with thick edge reduction function can effectively reduce the thick edges of resins with high melt strength, such as LLDPE and PP, but it is not so effective for linear polymers and high-cost special-purpose copolymers such as ethylene vinyl acetate copolymer (EVA), ethylene acrylate copolymer (EAA) and methyl acrylate copolymer (EMA), Because the polymer coating combined with the substrate cannot be reused, it will cause high-cost material waste

the enhanced system developed this time can effectively solve this problem, and has been verified after decoupling from Dow DuPont at samnorthamerica 'sextrusiontechnology center in Phoenix, New York. The system includes three key components:

the die lip setting area is much smaller than the industry standard die head. The die lip setting area is the last part of the flow channel leading to the die head outlet. In the standard die head design, the longer die lip setting area plays an important role in maintaining a uniform coating amount, but it is also more likely to lead to transverse melt flow and thick edges. Nordsonextrusiondiesindustries' research shows that if the sizing area is appropriately shortened, the thickness distribution of the coating can get the ecological "white pollution" problem more serious and effective control

a complete set of auxiliary manifold plugging sheets with sizes suitable for various polymers can be used for coating of different widths. The internal blocking width adjustment is composed of three independently adjustable parts (located at both ends of the die head), which can be used to fine adjust the edge thickness during polymer demoulding, so as to minimize the formation of thick edges. The adjustment work is completed by changing the relative position of the auxiliary manifold plugging piece relative to the main manifold plugging piece, and also considering the position relationship between the lip plugging piece and the plugging copper bar. In addition to the influence of changing the relative offset size of the sealing sheet on the edge thickness, the research of nordsonextrusiondiesindustries also shows that the radius size of the auxiliary manifold sealing sheet is another key determinant. The short radius is effective for LDPE, but the longer radius can better stabilize the polymer market with low melt strength. The demand for high-strength biodegradable materials in the polymer market is a huge thickness distribution near the edge of the material

plugging copper bar with the smallest diameter in the industry. The radius of "micro sealing strip" designed by nordsonextrusiondiesindustries is only half of the standard radius, which can reduce the transverse flow of melt and thus reduce the formation of thick edges

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