JPH07112745A - Structure of sealed sub-division bag and its manufacture - Google Patents

Abstract

PURPOSE:To mount sealed sub-division bags in a long roll on an automatic bag-making and filling apparatus without stages generated on both ends by making narrow cuts only on base material, sheets on surface and rear upper layers on a periphery to be fused of the sub-division bags wherein three sides of a base material resin sheet with polyethylene, aluminum or the like laminated are heat-fused. CONSTITUTION:A base material sheet 1 made of polypropylene or nylon is transferred from an original roll via rollers 2, 2, predetermined printing is applied in a printing roller 3 and a pressing roller 4, the sheet is dried in a drying means 5, and narrow cuts are provided on the sheet 1 in a plurality of vertical lines with predetermined intervals in a cut cutter roller 6 and a table roller 7. Then polyethylene films 9 are adhered to a surface and a rear face of the base material sheet, and the sheet material 1 subjected to lamination by a working device is cur into a plurality of vertical, lines so chat the narrow cuts are divided into two. The sheet materials 1 divided into four vertical lines are wound respectively by different rolls via rollers.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a sheet material prepared by laminating polyethylene, aluminum foil or the like on a polypropylene or nylon base sheet, which can be filled with powder, liquid or solid, and then sealed by heat sealing. The present invention relates to a bag, a sealed subdivision bag that is easy to manufacture and can be easily opened without impairing its strength. Polypropylene or nylon used for the sheet material has a higher softening point and a higher tensile strength than high-density polyethylene, but has a drawback that it is difficult to tear due to a large tear resistance when opening the subdivision bag.

[0002]

2. Description of the Related Art As a sealed subdivided bag which is easy to open, a sealed subdivided bag formed by fusing at least three sides has a plurality of through-holes in a fused portion of a sheet material constituting the bag or an outer diameter thereof. A bag is invented and known, which is characterized in that it is provided within a position of 3 mm from the edge line (Japanese Patent Laid-Open Publication No. Sho.
61-60469). In the case of this sealed subdivision bag, a plurality of through-holes with no missing parts are formed by pressing with a needle or the like within 3 mm inside from the edge line of the fusion-bonded part, so the through-holes are If the opened outer peripheral edge is torn with both hands, a salvage occurs at the through hole, and the propagation of this causes the sealed bag to be easily opened. As a method for producing the subdivided bag, a composite laminate film is arranged with a roll having protrusions in the shape of a trigonal pyramid so as to form a group of scratches having no missing portions in a plurality of rows, and then the central portion of the group of scratches is cut to obtain the obtained film. There is known a technology for producing pillow type bags by an automatic bag making and filling machine using the above-mentioned technology (Japanese Patent Laid-Open No. Sho-06-2006).
61-142159).

[0003]

However, in the case of such a conventional sealed subdivision bag and its manufacturing method, when slitting a raw material into a practical size, for example, a needle having a diameter of 1 mm is punched or punched, Since the scars are processed using the protrusions, the thickness of the sheet material cut out by pressing increases the thickness. Therefore, when slitted sheet material is wound on a roller, large steps occur at both ends, and when creating a sealed bag, the sheet material cannot be mounted on the automatic bag-making filling device as a long roll, and a short roll is used. It was necessary to wear the same thing, and it was necessary to frequently change the roll of sheet material. Further, since there is a step at both ends, there is a disadvantage that an error is likely to occur in the bag making work. Further, when the through-hole is formed after the sealed bag is formed, it is not easy to position the drilling position because the hole is formed after fusion bonding, and it is necessary to purposefully form the through-hole for drilling after fusion bonding. Equipment needs to be installed. Therefore, in view of the drawbacks of the prior art, the present invention is a sealing subdivision that is easy to open, has no step at both ends of the sheet material, and can be attached to an automatic bag making and filling device as a long roll. It is intended to provide the structure of the bag.

[0004]

Means for Solving the Problems That is, the present invention relates to a sealed subdivision bag made of a sheet material obtained by laminating polyethylene, aluminum foil or the like on a base material sheet such as polypropylene or nylon and heat-sealing at least three sides thereof. The structure of the sealed subdivided bag in which only the base sheet of the upper and lower layers of the periphery of the sheet material to be fused to form a small width cut is provided, and the base sheet of the polypropylene or nylon sheet is provided with a plurality of rows of small width cuts at predetermined intervals. And a step of laminating polyethylene after the step of cutting the base sheet, and a step of slitting in a direction that divides the cut of the laminated sheet into two or more rows of sheet materials after the step of laminating, A step of cutting each of the created sheet materials to an appropriate length to create a cut sheet, and folding the cut sheet together with 1 A step of heat sealing is opened and to achieve this object by the method of manufacturing a sealed subdivision bag and a step of sealing by heat sealing after filling the contents from the opening.

[0005]

In the sealed subdivision bag according to the present invention, a small width cut is provided on the outer peripheral edge of the base sheet of polypropylene or nylon, which is said to be the most resistant to tear of the laminated sheet materials, but other layers (such as aluminum foil and Since no cuts are provided in polyethylene etc., the cuts are not visible on the bag and the cut pieces do not protrude from the sheet surface, so that the cuts do not tear during transport of the bag or due to external factors. Since the base sheet of polypropylene or nylon, which is the most difficult to tear, has a cut on the outer peripheral edge, the bag can be easily opened by tearing from the cut. Further, in the production method according to the present invention, a thin film such as polyethylene is adhered with an adhesive after the base sheet made of polypropylene or nylon is provided with a cut, or the base sheet is coated with polyethylene by heat fusion. The surface of is a smooth surface. Next, by cutting the sheet by slitting or the like so as to divide the cut into two parts, the polypropylene layers and the like at both longitudinal edges of the slitted sheet have cuts at predetermined intervals. When this sheet material is cut perpendicularly to the longitudinal direction into cut sheets having an appropriate length, no cuts exist at the cut portions. After the cut sheet is folded in half, the heat-sealed portions of polyethylene or the like on both the left and right sides are heat-sealed, so that cut edges exist on the front and back edges of the heat-sealed portion. Next, after filling the contents from the open portion, the open portion is sealed by heat sealing to complete the sealed subdivided bag, and the final sealed portion has no cuts. Therefore, when the user opens the subdivided bag, the bag can be easily opened by tearing the heat-sealed portion having a cut.

[0006]

The present invention will be described in detail below with reference to the illustrated embodiments. FIG. 1 is a diagram showing an outline of a process of giving cuts to a base material sheet such as polypropylene or nylon of the present invention. A polypropylene or nylon base sheet 1 is transferred from a roll of a raw material (not shown) via feed rollers 2 and 2, and a printing roller 3 and a pressing roller 4 are provided.
After a predetermined printing is performed in the above, and after being dried by the drying means 5, the cutter roller 6 for cuts and the base roller 7
In Fig. 3, small-width cuts 8 are made on the sheet 1 at predetermined intervals in vertical rows (Fig. 3 (b)). The state is shown in Figure 2 (a).
The polyethylene film 9 is then adhered to the front and back of the polypropylene or nylon base sheet via an adhesive (FIG. 3C). In the figure, an aluminum foil is sandwiched between polyethylene and polypropylene. Next, the sheet material laminated by a slit processing device (not shown) is cut into a plurality of vertical columns so as to divide the narrow cut 8 into two (FIG. 2B).

As a result, a plurality of narrow cuts 8 are formed at both edges of the upper polypropylene layer of the cut sheet material. The sheet material, which is divided into four in four columns, is wound into different rolls via rollers. At this time, according to the method of the present embodiment, since both ends in the longitudinal direction of the sheet material have only the cut 8 and the cut portion is joined to another layer (for example, polyethylene), there is no missing portion, so that the thickness of the sheet increases. Without a step. Further, the laminated sheet material cut when wound on a roll is wound in a state of being tensioned to some extent. In the sheet material according to the present embodiment, even if the polypropylene layer is provided with the cut 8 Since the layer (aluminum foil or polyethylene) is not provided with cuts, it will not tear from the cuts 8 even if the sheet material is tensioned.

The wound roll is mounted on an automatic bag making and filling device (not shown) in a state of a long roll. Then, the sheet material is cut into a cut sheet 12 having an appropriate length to form one subdivided bag in the automatic bag making and filling device (FIG. 2c). The substantially rectangular cut sheet 12 is folded in two in an automatic bag making and filling device, and overlapping ends are fused by heat sealing or the like to form a pillow shape. The pillow-shaped bag is heat-sealed at the bottom,
After the powder, liquid or solid enclosure is filled, the remaining open parts are fused by heat sealing to form one sealed subdivision bag (Fig. 2d).

In the structure shown in FIG. 2, the cut surfaces at both ends having the cut 8 are overlapped to form a peeled shape, but the invention is not limited to this, and a cut cut as shown in FIG. By using a sheet and constructing both cut surfaces so that they overlap each other, the seal surface of the pouch has cuts 8 on at least two opposite sides. As described above, in the case of the sealed subdivided bag and the manufacturing method of the embodiment according to the present invention, the narrow cuts 8 are formed in the polypropylene layers above and below the peripheral edge of the sheet material fused to form the bag. The cut 8 is covered with polyethylene 9. In this embodiment, the aluminum foil and the polyethylene are bonded together via an adhesive, but the invention is not limited to this, and the polyethylene is heat-melted and directly heat-sealed to polypropylene or nylon. It goes without saying that such a configuration may be adopted.

[0010]

[Effect] The structure of the sealed subdivided bag according to the present invention has cuts only on the upper layers of both edges of the laminate sheet constituting the bag, and no cuts on the other layers. Cuts on the bag will not tear due to mechanical factors. Further, the sealed subdivision bag according to the present invention has excellent tensile strength because no cuts are provided in the layers other than the polypropylene or nylon base sheet of the sheet material. Therefore, the working speed for slitting the sheet material can be more than twice as high as that for the conventional punching of the through hole in the sheet material.

[Brief description of drawings]

FIG. 1 is a schematic view showing a manufacturing process of an embodiment according to the present invention.

FIG. 2 is a plan view showing the state of the sheet after each step, where a is a state in which a cut is provided, b is a state after slit processing, c is a state cut into 1 unit (cut sheet), and d is a state. The state of the sealed sealed subdivision bag is shown.

FIG. 3 is a cross-sectional view showing the state of the sheet after each step, where a is a state before processing, b is a state in which a cut is provided, and c is a state in which a sheet material is laminated with a polyethylene film interposed therebetween.

FIG. 4 is a plan view showing a second embodiment of slit processing.

FIG. 5 is a front view showing another embodiment of the sealed subdivision bag.

[Explanation of symbols]

 1 sheet material 2 feed roller 3 printing roller 4 pressing roller 5 drying means 6 cutter for cuts 7 rollers 8 cuts 9 thin film 10 heat sealing device 12 cut sheet

Claims (2)

[Claims] 1. A sealed subdivision bag made of a sheet material obtained by laminating polyethylene, aluminum foil or the like on a base material sheet such as polypropylene or nylon, and at least three sides of which are heat-sealed, and the sheet is fused to form the bag. A structure of a sealed subdivision bag, characterized in that a small width cut is provided only on the base sheet on the front and back layers on the periphery of the material. 2. A step of providing a plurality of rows of narrow cuts at predetermined intervals on a base material sheet of a polypropylene or nylon sheet, a step of laminating polyethylene after the step of cutting the base sheet, and the lamination after the laminating. A step of forming a plurality of rows of sheet materials by slitting in a direction that bisects cuts in the sheet, and a step of cutting each of the created sheet materials to an appropriate length to create a cut sheet,
A method for producing a sealed subdivided bag, which comprises a step of folding the cut sheet and opening one side to heat seal, and a step of filling the contents from the open portion and then sealing by heat sealing.