WO2019136794A1 - Online laser printing method for forming tear line at pillow bag - Google Patents

Abstract

An online laser printing method for forming a tear line at a pillow bag comprises the following steps: determining a packaging material; determining a shape of a pillow bag, and determining a position for a tear line; selecting a laser coding device; and printing a tear line. The method enables printing, sheet cutting and packaging to be performed in one process, thereby realizing simultaneous printing of a tear line and a batch number. Compared with an offline laser method, the present invention prevents a problem in which deformation of a packaging material occurs due to secondary stretching. Compared with a cutting method employing a cutting tool, the invention prevents a problem in which a bag cannot be torn easily when being torn through a traverse seal. Compared with a press-molding method, the present invention does not need to form a tear line in advance in a sheet production line, thereby reducing printing time and costs.

Description

Method for online laser printing easy tearing line of pillow bag Technical field

The invention relates to an online printing easy tearing line technology, and more particularly to a method for online laser printing easy tearing line used in conjunction with a pillow packaging machine.

Background technique

Pillow-type bags have been widely used in food and pharmaceutical packaging industries due to their advantages of quantitative packaging, convenient access, excellent quality and low cost. In order to facilitate the opening of the package, many product packaging designs are easy to tear.

At present, the common methods for making easy tearing on the market include molding method, off-line laser method, knife cutting method and easy tearing packaging material. Among them, the molding method and the off-line laser method need to be completed by the packaging material manufacturer. The cutter cutting method is to install the cutter on the pillow packaging machine. In the production process, the easy-to-tear port is cut out on the horizontal seal and the longitudinal seal of the small bag respectively. The disadvantages of their respective existence are:

(1) The molding method is to mold the easy-to-break line in the production process of the composite film, and the pre-production is high.

(2) The off-line laser method has the problem of secondary stretching of the paper sheet, which easily deforms the paper sheet, and causes the problem that the tear line is not easily torn when it passes through the horizontal seal.

(3) The cutter cutting method is to install the cutter on the pillow packaging machine, so that in the production process, the cutter acts on the transverse seal and the longitudinal seal of the package to cut the easy-to-tear port respectively, and the maintenance cost is high.

(4) The packaging of the ordinary packaging material is difficult to open, and the commercially available easy-to-tear packaging material is expensive due to the special formula, and the use cost is high.

Summary of the invention

The object of the present invention is to solve the problems of the prior art mentioned above, and to provide a method for online laser printing easy tearing of a pillow bag. The application of the method solves many problems existing in the prior art mentioned above, and has the characteristics of reducing maintenance cost, improving production efficiency, and being easier to tear.

The technical solution of the present invention is:

A method for online laser printing easy tearing of a pillow bag, comprising the following steps:

(1) Designing suitable packaging materials;

(2) Determining the shape of the bag of the pillow bag and designing the position of the tear line;

(3) Select a suitable laser code coder;

(4) Start the device and program to complete the printing of the easy tear line:

The virtual cam is used to pre-determine the position, so that the packaging material of the pillow-type packaging bag is moved to the designated position by the paper feeding mechanism, and then the trigger signal is sent by the PLC, and the laser coder receives the signal and emits laser light to penetrate the surface layer of the packaging material. Finally, according to the preset coding parameters, the printing of the easy tear line and the production batch number is completed.

In the above method:

The packaging material is an aluminum-plastic composite film, and the aluminum-plastic composite film comprises a surface layer, an intermediate layer and a bottom layer, and a connecting layer is disposed between the surface layer and the intermediate layer and between the intermediate layer and the bottom layer.

The surface layer material is PET, the middle layer material is AL, the bottom layer material is PE ₂ , and the connection layer material is PE or HDPE.

The thickness of the surface layer is 12 μm, the thickness of the intermediate layer is 7 to 20 μm, the thickness of the underlayer is 40 to 100 μm, and the thickness of the connection layer 34 is 0 to 40 μm.

The laser code coder adopts a closed CO ₂ laser marking system with a power of 15-100w.

The laser code coder is a Domino D320i laser code coder with a power of 30W.

The invention overcomes many shortcomings and deficiencies of the prior art, and the beneficial effects thereof are:

(1) Since the pre-designed laser-printed and cost-effective packaging material is used in combination with the pillow packaging machine, the cost is low and the maximum efficiency can be obtained compared to the special easy-to-tear packaging material.

(2) Optimized design of two right-angle pouches, which not only saves packaging materials, but also facilitates online laser printing, which is simple and convenient.

(3) It is not necessary to prefabricate the easy-to-break line in the paper production process as compared with the prior art molding method, and can directly print, saving time and trouble.

(4) The problem of the prior art cutter cutting method that is difficult to tear through the transverse seal is apt to occur in the process of tearing the pouch.

(5) One-step molding of printing, paper cutting and packaging, compared with the off-line laser method, the problem that the printed packaging material is deformed due to secondary stretching is eliminated.

(6) Using the pillow type packaging machine to print the standard function of the production batch number and borrowing the existing function module of the laser code printer, the two tasks of batch number printing and easy tear line printing can be completed simultaneously, which not only saves printing time but also improves The printing efficiency has good practicability.

DRAWINGS

1 is a schematic view showing the overall structure of a pillow packaging machine used in the present invention;

Figure 2 is a schematic view of the paper feeding mechanism of Figure 1;

Figure 3 is a side view of Figure 2;

Figure 4 is a schematic structural view of a packaging material (aluminum-plastic composite film) for making a pillow-type packaging bag;

5, FIG. 6, and FIG. 7 are a front view, a rear view, and a package development view of the bag shape A, respectively, and illustrate the shape and print position of the tear line;

8, 9, and 10 are a front view, a back view, and a package development view of the bag B, respectively, and illustrate the shape and print position of the tear line.

Marked in the figure: 1-laser emitting head, 2-laser coder, 3-aluminum plastic composite film, 31-surface layer, 32-intermediate layer, 33-bottom layer, 34-connection layer, 35-transparent, 36-easy Tear line, 37-longitudinal seal.

Detailed ways

In order to make the present invention easier to understand, the technical solutions of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

The method for online laser printing and easy tearing of the pillow packaging bag adopts the standard function of the printing batch number of the pillow packaging machine, and the existing laser marking function module is used to complete the printing of the easy tearing line and the production batch number.

Fig. 1 shows the overall structure of a pillow packing machine in which the framed portion is a paper feeding mechanism.

2 and 3 illustrate the structure of the paper feeding mechanism in a front view and a side view, respectively. As can be seen from the figure, the paper feeding mechanism comprises a laser coder 2 provided with a laser emitting head 1, and the direction of the arrow in the figure is the direction of movement of the packaging material.

4 is a packaging material aluminum-plastic composite film 3 suitable for online laser printing and easy tearing line designed to adapt to the method of the present invention. The aluminum-plastic composite film 3 is a multi-layer structure, and is generally divided into 3 according to different manufacturing processes. Layer structure or 5-layer structure:

When the manufacturing process is a gluing method, the aluminum-plastic composite film 3 has a 3-layer structure, wherein: the material of the surface layer 31 is PET, the material of the intermediate layer 32 is AL, and the material of the bottom layer 33 is PE ₂ ;

When the manufacturing process is a thermal composite method, the aluminum-plastic composite film is a 5-layer structure as shown in FIG. 4, wherein the material of the surface layer 31 is PET, the material 32 of the intermediate layer is AL, and the material of the bottom layer 33 is PE _{2 .} The difference from the three-layer structure is that a connection layer 34 made of a material PE or HDPE (high-density polyethylene) is provided between the surface layer 31 and the intermediate layer 32 and between the intermediate layer 32 and the bottom layer 33, respectively.

In the aluminum-plastic composite film structure described in FIG. 4, the surface layer 31 has a thickness of 12 μm, the intermediate layer 32 has a thickness of 7 to 20 μm, the bottom layer 33 has a thickness of 40 to 100 μm, and the connection layer 34 has a thickness of 0 to 40 μm. . When the thickness of the connection layer 34 is 0, it is a 3-layer structure.

The method for printing the easy-to-tear line by using the pillow-type packaging bag of the present invention for printing the tear-off line includes the bag-shaped A shown in FIG. 5, FIG. 6, and FIG. 7, and FIG. 8, FIG. 9, and FIG. The bag shape B, the bag shape A and the bag shape B are both right angle design which can save 3% of the package material compared to the round corner design (especially for the bag with a bag length of 100 mm). As can be seen, the transverse seal 35 of the pocket A has a 45° angle, and the tear line 36 is straight; the transverse seal 35 of the pocket B is straight, and the tear line 36 has a 3 to 45 The inclination of °. The pocket A and the pocket B are the same only for the longitudinal seal 37.

The invention relates to a method for online laser printing easy tearing of a pillow bag, by means of an existing pillow packaging machine and a laser code printer 2 mounted on a pillow packaging machine, the laser code printer 2 can be printed according to requirements The thickness of the easy-to-tear line is selected from a closed CO ₂ laser marking system with a power of 15-100w. In this embodiment, a Domino D320i laser coder with a universal package thickness is selected. The power of the laser coder is 30w, and the parameter settings are as follows:

project name

parameter

Laser energy (%)	95
Marking speed (bits/millisecond)	200
Jump speed (bits/millisecond)	1000
Maximum vector length (mm)	0.2
Marking delay (microseconds)	100
Jump delay (microseconds)	100
Polygon delay (subtle)	20
Laser turn-off delay (subtle)	120
Laser punch delay (subtle)	80

The method for online laser printing easy tearing of the pillow bag of the present invention comprises the following steps:

(1) Design the applicable packaging material structure;

(2) Determining the shape of the bag of the pillow bag and designing the position of the tear line;

(3) Select a suitable laser code coder;

(4) Start the device and program to complete the printing of the easy tear line:

Predetermining the position with the virtual cam, the aluminum-plastic composite film 3 is moved to the designated position by the paper-feeding mechanism, and then the trigger signal is sent by the PLC, and the laser coder 2 receives the signal and is emitted by the laser emitting head 1. The laser penetrates the surface layer 31 of the aluminum-plastic composite film 3, and finally, the simultaneous printing of the easy-to-peel line and the production lot number is completed according to the preset coding parameters.

The technical solutions of the present invention have been schematically described above with reference to the accompanying drawings and embodiments, and the description is not limited. It should be understood by those skilled in the art that in practical applications, the details of the settings and steps of the various parts of the present invention may be changed according to the actual situation, and others may make similarities under the enlightenment thereof. design. It is to be noted that all obvious changes and similar designs are intended to be included within the scope of the present invention.

Claims (6)

1. A method for online laser printing of a tear-off line for a pillow-type packaging bag, characterized in that the method comprises the following steps:

   (1) Designing suitable packaging materials;

   (2) Determining the shape of the bag of the pillow bag and designing the position of the tear line;

   (3) Select a suitable laser code coder;

   (4) Start the device and program to complete the printing of the easy tear line:

   The virtual cam is used to pre-determine the position, so that the packaging material of the pillow-type packaging bag is moved to the designated position by the paper feeding mechanism, and then the trigger signal is sent by the PLC, and the laser coder receives the signal and emits laser light to penetrate the surface layer of the packaging material. Finally, according to the preset coding parameters, the simultaneous printing of the easy tear line and the production batch number is completed.
2. The method according to claim 1, wherein the easy-to-peel line printed by the method is a straight tear line or an easy-to-peel line having an inclination angle of 3 to 45°.
3. The method of claim 1 , wherein the laser code reader uses a closed CO ₂ laser marking system with a power of 15-100 w.
4. The method of claim 3, wherein the laser coder uses a Domino D320i laser coder with a power of 30W.
5. The method of claim 1 , wherein the packaging material is an aluminum-plastic composite film, and the aluminum-plastic composite film comprises a surface layer, an intermediate layer and a bottom layer. a connecting layer is disposed between the surface layer and the intermediate layer and between the intermediate layer and the bottom layer; the surface layer material is PET, the middle layer material is AL, the bottom layer material is PE ₂ , and the connecting layer material is PE or HDPE. .
6. The method according to claim 5, wherein the aluminum-plastic composite film has a surface layer thickness of 12 μm and an intermediate layer thickness of 7 to 20 μm, and the bottom layer is The thickness is 40 to 100 μm, and the thickness of the connection layer 34 is 0 to 40 μm.

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