What is the Die Head of Blown Film Machine?

Customized die head analysis

- taking the double-sided spiral flow channel three-layer co-extrusion blown film machine die head as an example

In this paper, the design data of the double-sided spiral flow channel three-layer co-extrusion blown film die head with the central feeding structure is taken as an example,and the design process is analyzed according to the computer simulation as follows:

Basic Parameters:

Total output: 450kg/h

The allocation ratio of each tier:7: 2 :7

Fluid temperature:185C

STEP A:Extract model runner

STEP B:Raw material rheological data for each layer

STEP C: Mesh division

STEP D: Simulation results

Take the FFS(heavy bag) double-sided spiral flow channel three-layer co-extrusion round die with a total flow of 450kg/h, the distribution ratio of each layer is 1:2:1, and the fluid temperature is185℃ as an example. According to the calculated data to analyze the rationality of the flow channel parameters, combined with the practice of the production line, the best analysis results and design can be obtained. The product has been launched in a number of packaging material customers. Judging from the results of the launch, the pressure of each layer is close, the thickness is uniform,and the output of the counter current air ring will continue to increase in the later stage.

The product has been launched in many packaging material customers. Judging from the results of the launch, the pressure of each layer is close and the thickness is uniform. There will be room for continued improvement in output with counter-current air rings in the future.

The flow field analysis of the uniformity of the cooling air and the direction of the air in the heavy-packed die head is carried out. The data results after optimization and adjustment show that the automatic balance of the incoming and outgoing air is controlled by the system to control the size of the film bubble and reduce the air temperature in the bubble at the same time. Greatly improved product transparency and yield.