JPH0550506A - Connecting method of continuous bag for bag-in-box - Google Patents

Abstract

PURPOSE:To contrive to facilitate operation and shorten operating time and, further, also prevent foreign matter from entering between inner bag and paper container by a method wherein the connecting method of continuous bags for bag-in-box is improved. CONSTITUTION:At the connecting part of continuous bags, in which plastic bags are connected with one another in the shape of web, the tail edge of the last bag 11 of the connecting part and the top edge of the bag at the tip of the continuous bag connecting with the bag 11 or the top edge of the last bag 11 of the connecting part and the tail edge of the bag at the tip of the continuous bag connecting with the bag 11 are piled up each other so as to be bonded together by providing arbitrary number of point sealings 16 made by thermal fusion bonding normal to the running direction of the continuous bag at the piled-up part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for connecting continuous bags for a bag-in-box used in a continuous bag type filling machine.

[0002]

2. Description of the Related Art Recently, bag-in
Boxes called plastic boxes with a built-in plastic bag are widely used for food products such as seasonings, alcoholic beverages, dairy products and other beverages, and non-food products such as developers, detergents and dyes. It was This container is available in a large capacity of 2 liters to 30 liters for commercial use, and in a small to medium capacity of 1 liter to 3 liters available to general consumers.

Since the aseptic or non-aseptic filling machine used for filling the contents of the bag-in-box is a continuous bag-filling type filling machine, plastic bags (17) as shown in FIG. 2 are connected. A continuous bag (10) is used. If a defect occurs in the manufacturing process of this continuous bag, it is necessary to remove the defective bag and connect the continuous bags again. Conventionally, this connecting work is performed after removing the defective bag, and then, as shown in FIG. 3, a continuous bag that is connected to the ground end portion (13) of the bag (11) at the connecting portion of the connected continuous bag. Top of bag (12) on top (1
4) or the end of the bag at the end of the continuous bag to be connected to the top end of the bag at the connecting part of the continuous bag to be connected to and to be aligned on the same plane. The adhesive PET tape (21) is attached at right angles to the flow direction of the continuous bag so as to straddle the connection portion on the same surface, and after connecting the continuous bags, the contents are put at the connecting position of the continuous bags of the adhesive PET tape. A perforation line (22) was provided for separating the bag after filling. As another method, after removing the defective bag, as shown in FIG. 4, the end of the continuous bag connected to the end (31) of the ground of the bag at the connecting portion of the connected continuous bag is connected. The top end of the bag (32) or the top end of the bag at the connecting part of the continuous bag to be connected is overlapped with the bottom end of the bag at the tip of the continuous bag, The overlapping part (3
3) The whole surface is heat-sealed and adhered, and the perforated line (34) for separating the bag after filling the overlapping portion with the contents
Was to be provided.

[0004]

However, the joining method using the adhesive PET tape is a plastic in which the adhesive PET tape used for joining in the filling process of the contents is partially or wholly peeled off and accommodated in the paper container. There were problems such as mixing as foreign matter between the bag and the product, which was discovered when it became a product, resulting in a defective product, causing complaints from customers, and that it took time to connect the product. A bag-in-box in which the contents of a defective bag are filled is defective because the entire bag is inferior. Further, the method of connecting the overlapping portions by heat fusion on the entire surface has a problem that foreign matter is not mixed in, but the work is difficult and a long working time is required.

Therefore, an object of the present invention is to provide a continuous bag-in-box continuous bag which is relatively easy to work, has a short working time, and is free from the possibility of foreign matter being mixed between the paper container and the stored plastic bag. It provides a connection method for

[0006]

According to the present invention, as shown in FIG. 1, in the connecting portion of a continuous bag in which plastic bags are continuous in a web shape, as shown in FIG. A continuous connecting with the end (14) of the top (1) of the bag (12) at the end of the continuous bag connected with the end (13) of (2) or with the end of the top of the final bag at the joint. The end of the bag at the end of the bag was overlapped, and an arbitrary number of point seals (16) by heat fusion were provided at the overlapped part (15) at right angles to the flow direction of the continuous bag and bonded. It is a method for connecting continuous bags for bag-in-box, which is characterized in that

The shape, size, and number of the point seals by heat fusion according to the present invention differ depending on the size of the bag and the specifications of the tensile strength when the continuous bag of the filling machine used is moved or when tearing at the perforation line. Therefore, it is shown as a specific example in the embodiments described later.

[0008]

[Operation] A normal continuous bag that is not connected has a perforation line between the bags, and after the contents are filled in the filling machine, the perforation line is mechanically torn and separated into individual bags. It The continuous bag connected by the method of the present invention,
As shown in FIG. 1, the point seal part (16) provided by heat fusion, which is provided with no perforation line at its connecting part, is mechanically torn and separated into individual bags after filling the contents in the filling machine. It The adhesive strength of the point seal provided by the heat-sealing at the connecting portion (15) has such strength that it can withstand the tensile strength for moving the continuous bag in the filling machine, and the contents are filled in the filling machine. The shape, size, and number of seals are designed so that they will not withstand the tear strength when they are mechanically separated into individual bags later.

Further, in the conventional general joining method, an adhesive pet tape is used in the joining portion, and the individual perforated bags are mechanically torn in the filling machine from the perforation line provided on the adhesive pet tape. To be separated. At the time of tearing, a part of the adhesive PET tape was peeled off and detached, adhered to a machine part or bag, and mixed as a foreign substance after filling the contents between the paper container and the plastic bag, sometimes causing a problem. According to the joining method of the present invention, since the bag itself is connected by heat fusion and a material that causes contamination of foreign matter is not used, there is no problem of contamination of foreign matter.

[0010]

[Example] As shown in FIG. 2, the continuous bag-in-box bag is sealed (5, 6, 7, 8) on the four sides of the top and bottom by heat fusion and has a spigot (3) on the top. It is a series of provided plastic bags (17), and a perforation line (14) is provided between the bags for separating after the contents are filled. Generally, various plastic films of 75 μm are used as the material of the bag, and the structure is a double bag, for example, polyethylene / polyethylene,
Polyethylene / aluminum vapor-deposited stretched nylon, nylon / polyethylene, polyethylene / aluminum vapor-deposited stretched polyester, vinylidene chloride coat / polyethylene, etc. may be used.

When a defective bag is generated during manufacturing, the defective bag is cut and removed, and the portions are connected again to perform a connecting operation to make a continuous bag. As shown in FIG. 1, the tying method of the present invention is designed so that the end of the bag (13) at the end of the tying part and the top end (14) of the bag at the tip of the continuous bag are connected to each other. ~ 4 mm
The width overlapping is performed, and at the overlapping portion (15), several point seals (sealed in spots) (16) by heat fusion are provided at right angles to the flow direction of the continuous bag, and the points are bonded and connected. The shape, size and number of the point seals are designed according to the required specifications of the filling machine that uses continuous bags. The shape is a rhombus, a circle, a quadrangle, etc., but each width does not exceed 10 mm. Regarding the number, for example, about 8 places are provided for a 12-liter bag, about 7 places for a 9-liter bag, and about 5 places for a 5-liter bag. As the heat fusion method, an external heating method using an electric iron, a heat seal bar, or the like, and an internal heating method using high frequency or ultrasonic waves are used.

[Specific Example] A continuous double bag having a 75 μm polyethylene film on the outside and a 75 μm aluminum vapor-deposited stretched polyester film on the inside was prepared. When a defective bag was generated, the defective bag was cut. Removed,
As shown in FIG. 1-B, the top end (14) of the bag at the end of the continuous bag connected below the end (13) of the final bag at the joint is overlapped by about 4 mm width. At the same time, 7 points of rhombic point seals having a maximum width of 5 to 6 mm were provided and bonded to the overlapping portion at right angles to the flow direction of the continuous bag with an electric iron. One of the seven point seals is provided on the same line as the center point of the spout and the flow direction of the continuous bag. According to the joining method of the present invention, the joining work time is reduced from one-third to one-fourth as compared with the conventional joining method using the adhesive PET tape.

Next, 100,000 continuous bags in which 1000 places are connected by the above-mentioned connecting method of the present invention are filled with a bag-in-box aseptic filling machine (WF-A1 type) at a speed of 600 bodies per hour. went. As a result, no trouble in filling due to the connecting portion occurred at all. Further, as a matter of course, the problem that foreign matter is mixed between the plastic bag and the paper container did not occur.

[0014]

EFFECT OF THE INVENTION The continuous bag connecting method for bag-in-box according to the present invention can be used in comparison with a conventional connecting method using an adhesive PET tape or a connecting method using the entire surface of the overlapping portion by heat fusion. It ’s easier, less time is spent,
Further, there is no problem that foreign matter is mixed between the plastic bag and the paper container.

Further, in the joining method of the present invention, a different material such as a tape is not used in the joining portion, and the joining is performed by heat fusion. Since the appearance is beautiful, there is no discomfort due to joining.

[Brief description of drawings]

FIG. 1 is a partial plan view (A) and a side partial cross-sectional view (B) of a connecting portion of a continuous bag connected by the connecting method of the present invention.

FIG. 2 is a partial plan view of a continuous bag for a bag-in-box.

FIG. 3 is a partial cross-sectional view of a connecting portion of a continuous bag connected by a conventional connecting method using an adhesive PET tape.

FIG. 4 is a partial cross-sectional view of a connecting portion of a continuous bag which is connected by a conventional connecting method by heat-sealing whole overlapping portions.

[Explanation of symbols]

1 …… Bag top 2 …… Bag ground 3 …… Spout 4 …… Perforation line between bags 5,6,7,8 …… Seal part 10 …… Continuous bag 11 …… Final bag at joint part 12 …… The bag at the end of the continuous bag to be connected 13 …… The final end of the bag at the joint 14 …… The top end of the bag at the end of the continuous bag to be connected 15 …… The joint or overlap Mating part 16 …… Point seal 17 …… Plastic bag 21 …… Adhesive PET tape 22 …… Perforation line provided on the adhesive PET tape 31 …… Final edge of the bag at the end of the joint that is bonded by heat fusion Part 32 …… The top end of the bag at the tip of the continuous bag that is bonded by thermal fusion 33 …… Overlapping part 34 …… The perforation line provided in the overlapping part that is bonded by thermal fusion

Claims (1)

[Claims] 1. A connecting portion of a continuous bag in which plastic bags are connected in a web shape, and the end of the connecting bag and the top end of the bag at the tip of the continuous bag are connected to each other. Or, the top end of the continuous bag to be connected to the top end of the bag at the joint is overlapped with the end of the bag ground at the end of the continuous bag, and an arbitrary number of heat is applied to the overlapped part at right angles to the flow direction of the continuous bag. A method for connecting continuous bags for a bag-in-box, characterized in that a point seal by fusion is provided and bonded.