JPH06270369A - Production of laminated film for easily operable packaging bag - Google Patents

Abstract

PURPOSE:To obtain a laminated film for an easily openable packaging bag with a rough surface in position by a method wherein a plastic film continuously moving is passed from a plate cylinder of a printer to a roller of an easily openable surface-forming device driven at the same peripheral speed as the plate cylinder. CONSTITUTION:A film processor 1 consists of a printer 2 and an easily openable surface-forming device 3 disposed downstream of the printer 2. The printer 2 consists of a plate cylinder roller 4, a blanket cylinder roller 5, guide rollers 6, and a drier 7. The easily openable surfaceforming device 3 consists of a roller 9 provided with a rough surface-forming means 8 and a blanket cylinder roller 10. The rough surface-forming means 8 is formed by cutting a sand paper, for example, having a grid number of 80 into a small width and peripherally stretching and securely bonding it to the outer peripheral surface of the roller 9. The width and length of the sand paper are changed in accordance with a rough surface to be formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a laminated film used for making a packaging bag which can be easily opened.

[0002]

2. Description of the Related Art A laminated film obtained by laminating a plurality of plastic films has high tear strength and hardly breaks even when an external force is applied, and is known to be suitable as a material for packaging bags. It is difficult to open the packaging bag formed of the seed laminated film by hand due to the high tear strength of the material. Therefore, a V-shaped notch or an I-shaped notch is provided in the heat-sealing portion of the packaging bag to facilitate opening of the heat-sealing portion, or the end surface of the heat-sealing portion is scratched so that the heat-sealing portion is not damaged A packaging bag has been developed that is easy to open.

[0003]

However, in the packaging bag described above, the easy-open surface is formed only at the heat-sealed portion, and the easy-open surface cannot be formed at the bent portion of the packaging bag.

Further, a technical means for forming the easy-opening surface on the bent portion of the packaging bag has been proposed, but in this case,
Since printing on the plastic film and forming the rough surface on the plastic film are performed in separate steps, the plastic film's elongation will be affected unless the plastic film's moving speed is slowed down. Cannot be aligned. The present invention has been made in view of the above points, and a method for producing a laminated film for an easy-open packaging bag that allows a rough surface to be formed at a predetermined position without affecting the elongation or the printed surface of the plastic film. The purpose is to provide.

[0005]

A method for producing a laminated film for an easy-open packaging bag according to the present invention comprises an easy-open surface forming device comprising a roller provided with a narrow surface forming means extending in a circumferential direction and a blanket roller. The roller of the easy-opening surface forming device, which is arranged on the downstream side of the plate cylinder of the printing device, is attached to the plate cylinder so that the rough surface forming means of the narrow width provided on the roller is aligned with the predetermined position of the printing surface of the plate cylinder. The roller of the easy-open surface forming device is driven at the same peripheral speed as the peripheral speed of the plate cylinder of the printing device, and the plastic film is moved across the plate cylinder of the printing device while continuously moving. Along with printing, a narrow rough surface is formed from the other side of the printed film, and then this printed surface and the plastic film with the narrow rough surface are formed on the printed surface of the plastic film by means such as extrusion lamination. The Constructed by laminating the stick film.

[0006]

In the method for producing a laminated film for an easily-openable packaging bag according to the present invention, an easily-openable surface forming device for positioning a roller provided with a narrow rough surface forming means with respect to an arranged plate cylinder and driving at the same peripheral speed. Since the plastic film that moves continuously passes between the roller of the machine and the plate cylinder of the printing device, it is affected by the difference in elongation due to the tension applied to the plastic film that moves continuously and the blurring of the moving plastic film. Thus, it is possible to form a narrow rough surface at a predetermined position with respect to the printing surface.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a film processing apparatus used in the method for producing a laminated film of an easy-open packaging bag according to the present invention. The film processing apparatus 1 includes a printing apparatus 2 and an easy-open opening surface formed on the downstream side of the printing apparatus 2. And device 3. The printing device 2 includes a plate cylinder roller 4, a blanket cylinder roller 5, a guide roller 6 and a dryer 7. In FIG. 1, one set of printing devices 2 is provided, but a plurality of sets of this printing device 2 may be installed in parallel if necessary. When a plurality of sets of printing apparatuses 2 are arranged side by side, a correction roller is generally provided between adjacent printing apparatuses 2 to correct the deviation of the printing position.

The unsealing easy surface forming device 3 is composed of a roller 9 provided with a rough surface forming means 8 and a blanket roller 10 as shown in FIG. The rough surface forming means 8 is, for example, 80
The counting cloth is cut into a narrow width and fixed to the outer peripheral surface of the roller 9 so as to extend in the circumferential direction. The width and the length of this polishing cloth vary depending on the rough surface to be formed. Further, the blanket cylinder roller 10 is selected to have a Shore hardness of about 90 degrees so that the rough surface forming means 8 surely forms a rough surface. In this case, the pressing force of the blanket cylinder roller 10 is preferably its own weight plus about 1 Bar for forming a rough surface.

The plate cylinder roller 4 of the printing device 2 and the roller 9 provided with the rough surface forming means 8 of the easy-open opening surface forming device 3.
Are set to have the same diameter, and are operatively connected via the gear unit 11 so as to be driven from the same drive source at the same rotation speed. Rotating the plate cylinder roller 4 and the roller 9 at the same peripheral surface speed means that the plastic film 1 to be processed is processed.
A constant tension is applied to 2 to prevent a difference in elongation between the printing device 2 and the easy-opening surface forming device 3.
In FIG. 1, reference numeral 13 is a laminating device arranged on the downstream side of the easy-opening surface forming device 3. This laminating device 13 is of the extrusion type, for example.

In order to perform the printing process and the rough surface forming process on the plastic film 12, the rough surface forming means 8 first prints the roller 9 provided with the rough surface forming means 8 of the easy-open opening surface forming device 3. The plate cylinder roller 4 of the apparatus 2 is positioned so as to be at a predetermined position with respect to the printing surface, and the roller 9 of the easy-open opening surface forming apparatus 3 and the plate cylinder roller 4 of the printing apparatus 2 are driven at the same peripheral speed. Next, plastic film 1
2 is passed between the plate cylinder roller 4 and the blanket roller 5 of the printing device 2 to print on one surface of the plastic film 12, and then the dryer 7 is passed through the guide roller 6 to print the printed surface. After drying the ink, the plastic film 12 is formed on the rough surface forming means 8 of the easy opening surface forming device 3.
Is guided to a roller 9 provided with the roller 9 and is guided between the roller 9 and the blanket roller 10 in a state of being reversed as the roller 9 rotates. The plastic film 12 guided between the roller 9 and the blanket cylinder roller 10 presses the roller 9 with its own weight plus about 1 Bar, so that the rough surface forming means (polishing cloth) 8 of the roller 9 is formed. The mesh forms a rough surface having the width and length of the rough surface forming means (polishing cloth) 8 on the surface of the plastic film 12 opposite to the printed surface. The rough surface roughens the surface of the plastic film 12 but may or may not be rough enough not to form a through hole, but it is sufficient if the purpose of easy opening can be achieved. The roughness of this rough surface varies depending on the mesh of the polishing cloth.

In this way, the plastic film 12 having a rough surface formed on one side of the printed surface is sent to the laminating device 13 subsequent to the device 3 for forming the easy-open surface, and is laminated by extrusion molding to form an easy-open packaging bag. Construct a suitable laminated film. Positioning of the roller 9 provided with the rough surface forming means 8 of the easy-open surface forming device 3 with respect to the plate cylinder roller 4 of the printing device 2 is the same as that of the roller 9 of the easy-open surface forming device 3 and the plate cylinder roller 4 of the printing device 2. By driving at the peripheral speed, the tension applied to the plastic film 12 can be made constant, so that the elongation can be neglected, so that only lateral positioning is required. Therefore, the working efficiency is improved, the moving speed of the plastic film 12 can be increased, and the productivity of the easy-opening surface forming process is also improved. In the above embodiment, the easy-open opening surface forming device 3 and the extrusion laminating device 13 are used.
However, it is needless to say that the laminating apparatus may be another laminating method and the laminating apparatus 13 may be a separate process. Further, although an example of control of the reversing device is shown, there is a case where reversing is not necessary depending on the material of the plastic film 12 and the printed drawing.

[0012]

As described above, according to the present invention, it is possible to form a rough surface at a predetermined position without affecting the elongation of the plastic film or the printed surface.

[Brief description of drawings]

FIG. 1 is a diagram showing a laminated film manufacturing apparatus used in a method for manufacturing a laminated film of an easy-open packaging bag according to the present invention.

FIG. 2 is a plan view of a device for forming an easy-open surface.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Film processing device 2 Printing device 3 Easy opening surface forming device 4 Plate cylinder roller 8 Rough surface forming means 9 Roller 10 Blanket cylinder roller

Claims (1)

[Claims] 1. An easy-open surface forming device comprising an easy-open surface forming device composed of a roller provided with a narrow rough surface forming means extending in the circumferential direction and a blanket cylinder roller, disposed downstream of a plate cylinder of a printing device. The roller of the easy-opening surface forming device to the plate of the printing apparatus so that the narrow rough surface forming means provided on the roller aligns with the predetermined position of the printing surface of the plate cylinder. It is driven at the same peripheral speed as the cylinder, and while continuously moving, the plastic film is printed on one side through the plate cylinder of the printing device and a narrow rough surface is formed from the other side of the printed film. Then, the plastic film on which the printed surface and the narrow and rough surface are formed is laminated by extrusion laminating means on the printed surface of the plastic film. Irumu manufacturing method.