Preparation process of biaxially oriented polyethylene heat-sealing film and automatic assembly line

A technology of biaxial stretching and preparation process, which is applied in the field of preparation process and automatic assembly line of biaxially stretched polyethylene heat-sealing film, to achieve the effect of reducing length, ensuring transverse stretching effect and reducing floor space

Active Publication Date: 2022-04-19
SUQIAN GETTEL PLASTIC IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide the preparation technology and automatic assembly line of biaxially stretched polyethylene heat-sealing film, to solve the relevant problems raised in the above-mentioned background technology

Method used

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  • Preparation process of biaxially oriented polyethylene heat-sealing film and automatic assembly line
  • Preparation process of biaxially oriented polyethylene heat-sealing film and automatic assembly line
  • Preparation process of biaxially oriented polyethylene heat-sealing film and automatic assembly line

Examples

Experimental program
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Effect test

Embodiment 1

[0048] Example 1, such as Figure 1-3 As shown, after the core material enters the twin-screw extruder, it is necessary to remove excess air during the plasticization of the raw material, and then perform secondary plasticization, metering and filtration, and set its temperature to 230-240 °C; The surface layer raw materials are extruded and filtered through single-screw and twin-screw extruders. The temperature of the upper surface layer is set at 230-240°C, the temperature of the upper and lower surface layers is set at 235-245°C, and the temperature of the lower surface layer is set at 235°C. -245°C to ensure that the materials of the core layers of each layer adhere to each other.

Embodiment 2

[0049] Example 2, such as Figure 1-3 As shown, when the five-layer raw materials are controlled to be co-extruded through the die of the five-layer co-extrusion extruder 1, the temperature of the die is set at 235-245°C, the temperature of the chilling roll is set at 22-26°C, and the temperature of the cooling pool During the longitudinal stretching process, the temperature of the preheating zone is 108-118°C, the temperature of the stretching roller is 70-95°C, the stretch ratio is 4.8-5.2 times, and the temperature of the setting roller is 105- 125°C. During the transverse stretching process, the temperature in the preheating zone is 122-126°C, the temperature in the stretching zone is 115-120°C, the temperature in the shaping zone is 110-120°C, and the temperature in the cooling zone is room temperature. The stretch ratio is 7.5-8.8 times, so as to ensure the stretching effect of each stretching stage of the film raw material.

Embodiment 3

[0050] Example 3, such as Figure 1-5As shown in and 9, the operator controls the servo motor 131 through the control panel 10 to drive the second threaded rod 133 to rotate clockwise, and uses the thread to force the two sets of first mounting brackets 132 to approach each other, thereby driving the second threaded rods at both ends of the transverse stretching chamber 3. The U-shaped frame 15 and the first U-shaped frame 16 are automatically close to each other, and the second mounting frame 135 also slides on the sliding rod 134, thereby realizing adjustment between two groups of second U-shaped frames 15 and two groups of first U-shaped frames 16 The distance between them is correspondingly adjusted to the width of the film after transverse stretching, which improves the functionality of the polyethylene film automatic assembly line, and can be freely selected according to the degree of stretching that the film of different materials can withstand per unit time. Whether a ...

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Abstract

The preparation process comprises the following steps that the film is sequentially composed of an upper surface layer, an upper secondary surface layer, a core layer, a lower secondary surface layer and a lower surface layer, the core layer is a main extrusion layer, and the raw materials comprise, by weight, 97%-99% of homopolymerized polyethylene and 1%-3% of a slipping agent; the upper secondary surface layer and the lower secondary surface layer are prepared from the following raw materials in percentage by weight: 100% of homopolymerized polyethylene; the upper surface layer and the lower surface layer are heat-sealing layers, and each raw material comprises the following components in percentage by weight: 93-97% of homopolymerized polyethylene and 3-7% of an anti-sticking agent. By rotating a first threaded rod, an internal thread control ring can be driven to ascend or descend under the action of threads, so that two groups of mounting frames are driven to be automatically close to or far away from each other, the distance between two groups of guide rollers is controlled, and the tightness of a film in a transverse stretching bin is adjusted; the transverse stretching effect of the thin film can be fully guaranteed by matching with the transverse stretching structure for the thin film.

Description

technical field [0001] The invention relates to the technical field of biaxially stretched polyethylene film production, in particular to a preparation process and an automatic assembly line of a biaxially stretched polyethylene heat-sealing film. Background technique [0002] Heat-sealing film is mainly used in heat-sealing packaging of food, medicine, printing or box protection, and other electronic components. It is made by compounding heat-sealing film with CPP film, PA film or PE film. Such compound The material cannot be recycled, causing great plastic pollution, because the heat-sealable film is used instead of BOPP film, and the packaging bag with CPE or IPE as the inner layer can realize a single-material all-PE material packaging, which is recyclable , The application prospect is broad, so in order to respond to the national green environmental protection concept and fully implement the plastic restriction policy, the research and development of heat-sealing film i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29D7/01B29K23/00
CPCB29D7/01B29K2023/06
Inventor 喻世华马茂辉张迎张介钢
Owner SUQIAN GETTEL PLASTIC IND
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