Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of extrusion process of ethylene-vinyl acetate film

A technology of vinyl acetate film and vinyl acetate, which is applied in the field of polymer film extrusion, can solve the problems of slow production speed and achieve the effects of fast production speed, increased homogenization time, and increased rotational speed

Active Publication Date: 2016-09-07
BYD CO LTD
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcoming of slow production speed when producing EVA film with higher yield in the EVA film production process in the prior art, to provide a kind of ethylene that can improve production speed and the EVA film production yield of preparation is high. -Extrusion process of vinyl acetate film

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of extrusion process of ethylene-vinyl acetate film
  • A kind of extrusion process of ethylene-vinyl acetate film
  • A kind of extrusion process of ethylene-vinyl acetate film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) Assemble the twin-screw extruder screw assembly:

[0046] From the feeding section along the length of the screw: the feeding section is 56 / 56, 96 / 96, 96 / 96, 96 / 96, 96 / 96 threaded elements; the melting section is 72 / 72, 72 / 72, 72 / 72, 45 ° / 5 / 56, 45° / 5 / 56, 72 / 72, 72 / 72, 72 / 72, 45° / 5 / 36, 72 / 72, 72 / 72, 72 / 72, 45° / 5 / 36 Threaded element; Homogenizing section for 72 / 72, 72 / 72, 56 / 56, 56 / 56, 56 / 56, 56 / 56, 56 / 56, 56 / 56, 56 / 56, 56 / 56, 56 / 56 , 56 / 56, 56 / 56 threaded elements; the conveying section is 72 / 72, 72 / 72, 96 / 96, 96 / 130 threaded elements and the ratio of length to maximum diameter is 4:1, and the horn with a maximum diameter of 115mm . The threaded elements are connected with keyways to form a screw of a screw assembly. Among them, the feeding section is composed of 2-section threaded composite elements with a length of 440mm; the melting section is composed of 3-sectioned threaded composite elements with a length of 832mm; Composed of threaded composite elements, th...

Embodiment 2

[0052] For example, adopt the same screw assembly of the twin-screw extruder screw assembly as in Example 1 to assemble the twin-screw extruder. The difference is that the power of the motor is 45kw, and the rotating speed of the screw is 150 rpm / min. After the process is stable, record the line speed of production It is 8m / min, and the yield rate of the produced EVA film is 82.6%.

Embodiment 3

[0054] For example adopting the same twin-screw extruder screw assembly screw assembly twin-screw extruder as in Example 1, the difference is that the temperature of the control feeding section is 63 ° C; the temperature of the melting section is 70 ° C; the homogenization section The temperature is 80°C; the temperature of the conveying section is 90°C; the temperature of the melt pump is 90°C; the temperature of the mold body is 102°C. After the process is stable, the recorded production line speed is 16m / min, and the yield rate of the produced EVA film is 95.6%.

[0055] The production line speed of the EVA film of the present invention is high, the production speed is fast, and the yield rate of the product is high, and the production cost of the EVA film can be greatly reduced.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
lengthaaaaaaaaaa
lengthaaaaaaaaaa
lengthaaaaaaaaaa
Login to View More

Abstract

The invention provides an extruding technology of an ethylene-vinyl acetate (EVA) film. The extruding technology of the EVA film comprises the following steps: allowing an EVA raw material to sequentially go through a feeding segment, a melting segment, a homogenizing segment, a conveying segment, a melt pump and a die body, and extruding, wherein the temperature of the feeding segment is 58-70DEG C; the temperature of the melting segment is 65-95DEG C; the temperature of the homogenizing segment is 85-90DEG C; the temperature of the conveying segment is 85-90DEG C; the temperature of the melt pump is 80-90DEG C; and the temperature of the die body is 90-110DEG C. The conveying capacity of the conveying segment is greater than the conveying capacity of the homogenizing segment, so the production speed is improved, and the production yield of the prepared EVA film is high.

Description

technical field [0001] The invention relates to the technical field of polymer film extrusion, in particular to an extrusion process of ethylene-vinyl acetate film. Background technique [0002] Ethylene-vinyl acetate (EVA) copolymer film is a commonly used photovoltaic packaging film for solar cells. The vinyl acetate content of ethylene-vinyl acetate (EVA) is 25-45%, and the melt index is between 10-400. The development of power generation, which also reaches large-scale use. [0003] However, in the existing production process of ethylene-vinyl acetate (EVA) photovoltaic packaging film, the ethylene-vinyl acetate raw material is generally extruded through the feeding section, the melting section, the homogenizing section, the melt pump and the mold body, among which, The temperature of the feeding section is 62°C; the temperature of the melting section is 65°C; the temperature of the homogenization section is 68°C; the temperature of the conveying section is 68°C; the te...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B29C47/00
CPCB29C48/08B29C48/57B29C48/625B29C48/92B29C2948/9259B29C2948/92704
Inventor 宫清周维伍伯林宋宇黄江
Owner BYD CO LTD