CN108544800B

CN108544800B - Forming process of low-emission plastic packaging bag

Info

Publication number: CN108544800B
Application number: CN201810243305.3A
Authority: CN
Inventors: 杨海金
Original assignee: Fujian Minghe New Material Technology Co ltd
Current assignee: Fujian Minghe New Material Technology Co ltd
Priority date: 2018-03-23
Filing date: 2018-03-23
Publication date: 2021-04-20
Anticipated expiration: 2038-03-23
Also published as: CN108544800A

Abstract

The invention discloses a forming process of a low-emission plastic packaging bag, which comprises a process for forming a plastic film and a process for forming the packaging bag by the plastic film, wherein the process for forming the plastic film comprises the following steps: selecting milky PE as a printing film, and printing on the outer surface of the printing film to form a color ink layer; secondly, coating a layer of transparent glue layer on the outer surface of the color ink layer; thirdly, forming a surface film layer on the transparent glue layer, wherein the surface film layer is a transparent or matte PE film. Compared with the prior art, the invention does not need to adopt a white ink layer as a substrate, thus reducing the use amount of the ink by at least 50 percent, not only reducing the finished products of the company, but also greatly reducing the discharge of VOC, and meeting the current domestic trend requirements of energy conservation and environmental protection.

Description

Forming process of low-emission plastic packaging bag

Technical Field

The invention relates to the field of forming of packaging bags, in particular to a forming process of a low-emission plastic packaging bag, which has the characteristics of low cost and low VOC emission.

Background

As shown in fig. 1, a conventional plastic film forming process for a plastic packaging bag includes printing a color ink layer 92 on an inner surface of a printing film 91, printing a white ink layer 93 serving as a substrate on an inner surface of the color ink layer 92, coating a glue layer 94 on an inner surface of the white ink layer 93, and applying a bottom film 95 on an inner surface of the glue layer 94, thereby completing the processing of the entire plastic film. In the above processing steps, the inner surface is defined by the inside and the outside of the plastic packaging bag formed last, that is, the side located inside the plastic packaging bag is the inside, and the side located outside the plastic packaging bag is the outside, the printing film 91 is a transparent or matte PE film, and the bottom film 95 is a milky PE film. In the above conventional process, the color ink layer 92 and the white ink layer 93 need to be printed in sequence, and since the amount of ink in the white ink layer 93 is at least greater than or equal to that in the color ink layer 92, the overall ink consumption is very large, which not only causes the processing cost of the whole film to be high, but also causes the problem of high VOC emission, and brings heavy pollution to the environment. In view of the above, the present inventors have made extensive studies on the above-mentioned drawbacks of the prior art, and have made this invention.

Disclosure of Invention

The invention mainly aims to provide a forming process of a low-emission plastic packaging bag, which has the characteristics of low cost and low VOC emission.

In order to achieve the above purpose, the solution of the invention is:

a forming process of a low-emission plastic packaging bag comprises a process of forming a plastic film and a process of forming the packaging bag by the plastic film, wherein the process of forming the plastic film comprises the following steps:

selecting milky PE as a printing film, and printing on the outer surface of the printing film to form a color ink layer;

secondly, coating a layer of transparent glue layer on the outer surface of the color ink layer;

thirdly, forming a surface film layer on the transparent glue layer, wherein the surface film layer is a transparent or matte PE film.

Further, the process for forming the packaging bag by using the plastic film comprises the following steps:

A. folding a plastic film to form a first bag surface, a first bottom surface, a second bottom surface and a second bag surface, wherein an inner folding line is formed between the first bottom surface and the second bottom surface, and a first clamping mark and a second clamping mark are respectively formed at two end parts of the inner folding line;

B. heat-sealing two sides of the first bag surface, the first bottom surface, the second bottom surface and the second bag surface by using heat-sealing equipment to form a first longitudinal heat-sealing line and a second longitudinal heat-sealing line which are positioned at two sides;

C. a first transverse heat sealing line is also formed between the first bottom surface and the first bag surface, and a second transverse heat sealing line is also formed between the second bottom surface and the second bag surface;

D. and lifting belts are also connected outside the first transverse heat-sealing line of the first bottom surface and outside the second transverse heat-sealing line of the second bottom surface in a bonding manner, so that the whole plastic packaging bag is formed.

After the structure is adopted, the forming process of the low-emission plastic packaging bag adopts the forming steps completely different from the prior art, the prior art adopts a layer-by-layer forming mode from outside to inside, the invention adopts a layer-by-layer forming mode from inside to outside, and based on the forming process, the milky PE is adopted as the printing film which is used as the substrate layer, when the color ink layer on the printing film is printed, the printing quality problem can be well found by adopting detection machine identification or manual identification, so that the judgment can be made as early as possible, and the waste product cost of enterprises is reduced. The transparent glue layer is adopted, so that the color ink layer can be well displayed outwards through the surface film layer, and the quality of the whole plastic packaging bag is ensured.

Compared with the prior art, the invention does not need to adopt a white ink layer as a substrate, thus reducing the use amount of the ink by at least 50 percent, not only reducing the finished products of the company, but also greatly reducing the discharge of VOC, and meeting the current domestic trend requirements of energy conservation and environmental protection.

Drawings

Fig. 1 is a flow chart of a forming process of a plastic film in a plastic packaging bag in the prior art.

Fig. 2 is a flow chart of the forming process of the plastic film in the low-emission plastic packaging bag according to the invention.

Fig. 3 is a schematic view of the folded plastic film of the present invention.

Fig. 4 is a schematic structural view of a preferred embodiment of the low-emission plastic packaging bag according to the present invention.

In the figure:

printing a film-11; color ink layer-12; transparent glue layer-13; a pellicle layer-14;

a first pocket face-21; a first bottom surface-22; a second bottom surface-23; a second pocket face-24;

an inner fold line-31; a first pinch-32; a second pinch-33;

a first longitudinal heat seal line-41; a second longitudinal heat seal line-42;

a first transverse heat seal line-51; a second transverse heat seal line-52;

printing a film-91; color ink layer-92; white ink layer-93;

glue layer-94; a base film-95.

Detailed Description

In order to further explain the technical solution of the present invention, the present invention is explained in detail by the following specific examples.

The invention relates to a forming process of a low-emission plastic packaging bag, which comprises a process for forming a plastic film and a process for forming the packaging bag by the plastic film.

As shown in fig. 2, it is the process of molding the plastic film, which comprises the following steps:

selecting milky-white PE as a printing film 11, and printing on the outer surface of the printing film 11 to form a color ink layer 12;

secondly, coating a transparent glue water layer 13 on the outer surface of the color ink layer 12;

thirdly, forming a surface film layer 14 on the transparent glue layer 13, wherein the surface film layer 14 is a transparent or matte PE film.

As above, the invention is realized by adopting the closed mode, and the complete plastic film is formed after the step (c).

Therefore, the forming process of the low-emission plastic packaging bag adopts the forming steps completely different from the prior art, the prior art adopts a layer-by-layer forming mode from outside to inside, the invention adopts a layer-by-layer forming mode from inside to outside, based on the invention, the ivory-white PE is adopted as the printing film 11, the printing film 11 is adopted as the substrate layer, when the color ink layer 12 on the printing film is printed, the printing quality problem can be well found by adopting detection machine identification or manual identification, so that the judgment can be made as early as possible, and the waste product cost of enterprises is reduced. According to the invention, the transparent glue layer 13 is adopted, so that the color ink layer 12 can be well displayed outwards through the surface film layer 14, and the quality of the whole plastic packaging bag is ensured.

As shown in fig. 3 and 4, the process of forming the plastic film into the packaging bag comprises the following steps:

A. folding a plastic film to form a first bag surface 21, a first bottom surface 22, a second bottom surface 23 and a second bag surface 24, wherein an inner folding line 31 is formed between the first bottom surface 22 and the second bottom surface 23, and a first clamping mark 32 and a second clamping mark 33 are respectively formed at two end parts of the inner folding line 31;

B. heat-sealing two sides of the first bag surface 21, the first bottom surface 22, the second bottom surface 23 and the second bag surface 24 by using a heat-sealing device to form a first longitudinal heat-sealing line 41 and a second longitudinal heat-sealing line 42 which are positioned at two sides;

C. a first transverse heat-sealing line 51 is further formed between the first bottom surface 22 and the first bag surface 21, and a second transverse heat-sealing line 52 is further formed between the second bottom surface 23 and the second bag surface 24;

D. a pulling tape (not shown) is bonded to the first bottom surface 22 except the first transverse heat-sealing line 51 and the second bottom surface 23 except the second transverse heat-sealing line 52, thereby completing the molding of the entire plastic packaging bag.

Thus, by utilizing the first clamping mark 32 and the second clamping mark 33, in the process that the product is pushed to the whole plastic packaging bag by a machine, the product can form the breakthrough at the first clamping mark 32 and the second clamping mark 33, so that the formation of the breakthrough influencing the sale of the whole product on the first bag surface 21 and the second bag surface 24 is avoided, and the breakthrough formed by the first clamping mark 32 and the second clamping mark 33 can play a role in ventilation and air permeation due to invisibility, thereby achieving multiple purposes.

The above embodiments and drawings are not intended to limit the form and style of the present invention, and any suitable changes or modifications thereof by those skilled in the art should be considered as not departing from the scope of the present invention.

Claims

1. A forming process of a low-emission plastic packaging bag is characterized by comprising a process of forming a plastic film and a process of forming the packaging bag by the plastic film, wherein the process of forming the plastic film comprises the following steps:

thirdly, forming a surface film layer on the transparent glue layer, wherein the surface film layer is a transparent or matte PE film; the process for forming the packaging bag by using the plastic film comprises the following steps:

in the process that the product is pushed to the whole plastic packaging bag by a machine, the product can form the breakthrough at the first clamping mark and the second clamping mark, so that the formation of the breakthrough influencing the sale of the whole product on the first bag surface and the second bag surface is avoided, and the breakthrough formed by the first clamping mark and the second clamping mark is in an invisible state;