Three-layer co-extrusion plastic film blow molding machine head with combined type rotary core rod and layered two-channel temperature control device

A rotating core, dual-channel technology, applied in the field of three-layer high-precision composite blown film production, to improve product quality, eliminate material flow traces and crystal points

Active Publication Date: 2015-01-14
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem of processing multi-layer composite films of plastic materials with large performance differences, the invention rea

Method used

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  • Three-layer co-extrusion plastic film blow molding machine head with combined type rotary core rod and layered two-channel temperature control device
  • Three-layer co-extrusion plastic film blow molding machine head with combined type rotary core rod and layered two-channel temperature control device
  • Three-layer co-extrusion plastic film blow molding machine head with combined type rotary core rod and layered two-channel temperature control device

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0029] Example 1

[0030] figure 1 It is an embodiment of the present invention, which is used to produce a three-layer composite film composed of three different types of plastic materials and having different rheological properties of different materials. The integral composite film blowing head is fixed on the base by bolts, and the inlet of the blowing pipe is connected with the high-pressure air supply device. The high-pressure air is blown in from the inlet of the blowing pipe, passing through the air pipe in the rotatable central core rod, and blowing out from the outlet of the blowing pipe. The lower end of the rotatable central mandrel is connected with the sprocket and the stepless speed change device through a key, and can be rotated at a set speed according to the process requirements to push the inner material toward the die. The middle layer material enters the machine head from the middle layer material inlet device, and passes through the annular semicircular mai...

Example Embodiment

[0036] Example 2

[0037] Figure 4 It is the second embodiment of the present invention, and is used for three-layer composite blown film processing of plastic materials with poor fluidity. The difference between Embodiment 2 and Embodiment 1 is:

[0038] For materials with poor fluidity or heat-sensitive materials, it is necessary to shorten the residence time of the material in the flow channel of the machine head as much as possible. Therefore, it is necessary to shorten the flow channel length of the middle core mold and the inner core mold. Therefore, in Example 2 of the present invention, A, The three extruders B and C are placed in the same horizontal position, and the angle between the centers of the adjacent two extruders is 120°, and feeds to the semicircular annular main flow channel from the inside through a feed distributor.

[0039] Three different plastic materials are fed into the three material inlets of the machine head by respective extruders, namely inner mater...

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Abstract

The invention discloses a three-layer co-extrusion plastic film blow molding machine head with a combined type rotary core rod and a layered two-channel temperature control device and relates to the field of molding of multi-layer plastic composite films. The machine head comprises a rotary core rod with combined thread elements, wherein materials in a middle layer and an outer layer respectively enter the machine head by virtue of material inlet devices in the middle layer and the outer layer and compositely flow towards a hole mold by virtue of a semi-circular annular main runner formed by core molds in the inner layer and the middle layer and core molds in the middle layer and the outer layer, multistage parallel branch pipes, a multi-head thread section-variable branch runner and a pressure-stabilization area transition runner; a heating and cooling system capable of independently controlling the temperature is arranged on the core mold in each layer. By virtue of measures of changing the rotation speed of the rotary core rod, the combination of the thread elements, the stage number of the parallel branch pipes, the number of heads and the inclined angle of each branch runner and modifying the section shape of each branch runner and a gap of the pressure-stabilization area transition runner, three types of plastic melts are same in process pressure drop, stay time and shear stress at a composite interface during flowing from the machine head inlet to the hole mold, so that plastic composite films with different properties are produced.

Description

technical field [0001] The invention relates to a blow molding machine head for producing a three-layer co-extrusion composite plastic film, in particular to the improvement of the structure of the spiral mandrel of the machine head and a method for controlling the temperature of each layer of mandrel, especially suitable for the production of a three-layer high-precision composite blow molding film make. Background technique [0002] With the continuous emergence of new polymer materials and the continuous improvement of the performance requirements of polymer extruded films in the market, single-component films often cannot economically meet the requirements of use and processing. Using the multi-layer co-extrusion process, multiple layers of materials with different characteristics can be plasticized by multiple extruders, and then co-extruded into a compound head for convergence. Through the processes of blow molding, cooling, pulling and coiling, the composite function...

Claims

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Application Information

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IPC IPC(8): B29C49/04B29C47/06B29C47/20B29C47/86B29C48/32
Inventor 江波张冰邹永刚
Owner BEIJING UNIV OF CHEM TECH
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