JPH0444916A - Vertical bag making, filling, and packaging methods - Google Patents

Abstract

PURPOSE:To realize the equivalent packaged condition to envelope-gluing-type 3-side sealed packaging while using a film for bag by a method wherein on the front side of a product filling cylinder, end edges of a film is closely butted, and made to be a packaging cylinder for which the film end edges are joined into a sealed state by a stitch sealing tape in such a manner that the end edges are overlapped on the inside. CONSTITUTION:A film for bag F with a required width is guided from the backside of a former l and wound through the former 1, and set under a condition in which film end edges (f), (f) are closely butted. By winding a stitch sealing tape T around guides rolls 11, 12, 13, and the stitch sealing tape T is joined to the front surface of a product filling cylinder 2 on the top of the former 1, and introduced to the inside of the butted film end edges (f), (f), to be overlapped, to perform layout. The stitch sealing tape T which slides along a teflon plate 6 is heated to a welding temperature by a vertical heater bar 3, and loosely welded in such a manner that the tape T joins the closely butted film end edges (f), (f) at the front edge, and then firmly welded when pressure is added by a joining roll 4.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a vertical bag-forming-fill-packaging method in which both edges of a bag film, which is a wrapping material, are vertically sealed by vertically abutting the ends of the bag film.

[Prior Art] In the conventional vertical form-fill-fill packaging method, a strip-shaped continuous bag film whose inner surface is overcoated with a thermoplastic film is guided to a former, and the edges of the film are brought into contact with each other in the former. It is bent into a cylindrical shape so as to meet the front side of the product filling cylinder inserted into the tube and to wrap around the product filling cylinder. and,
Vertical sealing was performed by bringing the edges of the film together in front of a product filling tube inserted through the former, and sandwiching this between a pair of heater bars or heater rolls for heat sealing.

This packaging form is called a three-sided seal packaging, and most of the conventional three-sided seal packaging performed using vertical form-fill-seal machines has been this method.

Other three-sided seal packaging uses heat-resistant film that is printed on the outside and then overcoated with thermoplastic film on both sides, with one of the edges of the film on the inside and the other on the outside. The method used is to stack and heat-seal the products by pressing them with a product filling cylinder and a vertical sealer.
This packaging form is called a so-called envelope pasted three-sided seal packaging.

[What the invention seeks to achieve! The 1M1 gassho pasting gassho pasting sticker packaging does not look neat because the vertical seal part is ribbed.

In envelope pasting type three-sided seal packaging, the thermoplastic film overcoated on the outside reduces the sharpness of the print, is easily scratched, and has weak vertical sealing strength. It is very difficult to achieve a good-looking seal.

The present invention solves the above-mentioned drawbacks and provides a vertical bag-forming and filling method that can realize a packaging form equivalent to envelope-type three-sided seal packaging, while using the bag film used for folding three-sided seal packaging. A packaging method is provided.

[Means for Achieving the Object] The present invention, as a means for solving the above-mentioned problem, includes the following steps: A continuous bag film F in the form of a belt whose inner surface is overcoated with a thermoplastic film is introduced into a former 1. Then, the edges of the film f and f meet the front side of the product filling cylinder 2 inserted into the former 1, and the film is bent into a cylindrical shape so as to wrap around the product filling cylinder 2, and the film is fed downward continuously or intermittently. At the same time, the edges of the film guided to the front side of the product filling cylinder 2 below the former 1 are aligned.

In the vertical bag making and filling packaging method, the bag is vertically sealed A to form a packaging tube H, and the top and bottom of the packaged object W to be dropped and filled through the product filling tube 2 of the packaging tube H is horizontally sealed B. By setting the film F to the required width, the edges of the film are aligned f on the front side of the product filling cylinder 2.

f are in a state where they are exactly abutted, and the edges of the film that are abutted are overlapped on the inside of f and f,
A seam sealing tape T having a required width and having both sides thermofusible is introduced from the front side of the product filling cylinder 2 above the former 1, and when the vertical sealing A is performed, the seam sealing tape T A vertical bag making, filling and packaging method is provided, which is characterized in that the edges f and f are connected in a sealed state without a gap to form a packaging cylinder H.

[Example] Hereinafter, an example of the vertical bag-forming-fill-packaging method of the present invention will be described with reference to the drawings.

1 to 4 show a vertical form-fill-seal machine for carrying out the vertical form-fill-seal method of the present invention, and the configuration will be briefly described below.

The former 1 bends a continuous bag film F led from the rear and having an inner surface overcoated with a thermoplastic film into a cylindrical shape so as to wrap around the product filling cylinder 2 inserted through the former 1. On the front side of the product filling cylinder 2 below the former 1, a vertical sealing means consisting of a vertical heater par 3 and a close contact roll 4 is provided. The vertical heater par 3 has an adjustable gap with the product filling cylinder 2,
The distance is maintained at 0.5 to 1 mm during sealing, and the required distance 1, for example, 30 mm, is maintained to prevent heat from being applied to the bag film F outside the product filling tube 2 when the film is stopped. v,
The application roll 4 is provided so as to be in close contact with the product filling cylinder 2, and is rotated to feed the film by a motor 5. A Teflon plate 6 is provided on the front side of the product filling cylinder 2 from the upper end to the lower end to compensate for film slippage. On both left and right sides of the product filling cylinder 2 below the former 1,
A pair of paper pulling belt devices 14 for transporting the film are provided in close contact with each other.

The horizontal seal cutting means 7 includes a pair of horizontal seal pars 7a,
7b and a cutter 70, the driving device M7d moves the horizontal sealer 7a in a circular box motion as shown by arrow XI, and the driving device 7e moves the horizontal sealer 7b and cutter 70 in perfect symmetry and synchronization with arrow XI. This can be done when the film is continuously fed by making a box motion in a circular shape as shown by the arrow x2.

The drive devices 7d and 7e are switched so that the horizontal sealer 7a or 7b moves the horizontal component of a circular box motion, so that it can also be used when the film is fed intermittently. . A swing ring 7f supporting the drive devices 7d and 7e is supported by the packaging machine main body frame 8 so as to be horizontally swingable, and is positioned at a desired swing angle by an appropriate swing drive means 9.

On the front side of the product filling cylinder 2 above the former 1, there is a holder shaft 10 on which is attached a roll R wrapped with a seam sealing tape of a required width, both sides of which are thermofusible. A plurality of guide rolls 11, 12, and 13 are provided for rolling the seam sealing tape T fed out as necessary and bringing it into close contact with the front surface of the product filling cylinder 2.

Next, in connection with the operation of the vertical bag-forming-fill-sealing machine,
An embodiment of the vertical bag-forming-filling-packaging method of the present invention will be described.

First, the bag film F having the required width is guided from the back of the former 1 to the former 1, passed through the inside of the former 1, wrapped around the product filling cylinder 2 so as not to wrinkle, and guided downward. If the zero-bag film F, which is set so that the film edges f and f are butt against each other, has an appropriate width, it can be inserted into the product filling cylinder by passing through the gap between the former 1 and the product filling cylinder 2. 2 so that no wrinkles occur, and even when the film is fed, the state in which the film edges f and f are perfectly abutted against each other is maintained. Therefore, the required width of the bag film F is the outer circumferential length of the product filling tube 2 + α.

+α is only a few mm, but it is determined by conducting a film feeding test to obtain an appropriate size, and is not determined theoretically. It is a continuous band-shaped film in which the inner surface of a heat-resistant film is overcoated with a thermoplastic film such as polyethylene, and is the same as the film used for bags used in three-sided seal packaging. In particular, the bag film F can be printed convergently on the inside surface.

A roll R wrapped with a seam sealing tape of a required width, which is thermofusible on both sides, is attached to the holder shaft 10 on the front side of the product filling cylinder 2 above the former 1, and the roll R attached to the holder shaft 10 is fed out. Wrap the seam sealing tape T around the guide rolls 11, 12, and 13 and bring it into close contact with the front part of the product filling cylinder 2 above the former 1, and then overlap the film edges f and the inside of f to be abutted. Make a stakeout to introduce it like this.

Then, turn on the power to the heater, and
A pair of paper pulling belts are brought into close contact with both left and right sides of the product filling cylinder 2, and packaging operation is started in continuous feed mode.

Then, the film is continuously fed by the paper belt W14, and the vertical heater par 3 approaches the Teflon plate 6 on the front side of the product filling cylinder 2, and the seam sealing tape T slides over the Teflon plate 6. is heated to a welding temperature by a vertical heater par 3, and the seam sealing tape T is loosely welded so as to connect the film edges f, f which are exactly abutted on the front side of the seam sealing tape T, and then , pressure is applied by the close contact roll 4 to strongly weld.

In this way, while the vertical sealing A is performed and the packaging tube H is continuously formed, a predetermined amount of the packaged items W are dropped into the product filling tube 2 at regular time intervals. Then, the horizontal sealing/cutting means 7 performs a box motion to horizontally seal the upper and lower sides of the packaged object W in the packaging tube H. Horizontal seal 8
Since the seam sealing tape T is thermofusible on both sides, heat sealing is guaranteed at the seam sealing tape T in the part.

Next, when starting packaging operation in continuous feed mode,
The paper pulling belt device 14 is activated as soon as the vertical heater par 3 approaches the Teflon plate 6 on the front side of the product filling cylinder 2.
and film feeding by the length of the bag using the close contact roll 4,
The movement of the vertical heater par 3 away from the Teflon plate 6, which is performed immediately after film feeding is completed, is repeated alternately.

The horizontal seal/cut means 7 includes a horizontal sealer 7a.
, 7b and cutter 70 do not perform box motion,
The upper and lower sides of the packaged object W in the packaging tube H are horizontally sealed B by performing an opening and closing operation that involves only horizontal movement.

Figure 5 shows a three-sided seal packaging bag manufactured by the above-mentioned vertical form-fill-fill-seal machine. - Just by looking at it, you can't see the vertical seal and you can see the appearance of a one-sided seal packaging bag that consists of only upper and lower horizontal seals. present. FIG. 6 shows the rotation driving means 9 being driven to rotate and fix the rotation ring 7f by a desired rotation angle, thereby moving the spear seal B at a required angle in the horizontal plane with respect to the front and back direction of the product filling cylinder 2. This is a three-sided seal packaging bag manufactured by packaging operation. As can be seen from this, it is possible to package so that the vertical seal A is on the edge of the horizontal seal B, and if the printing on both sides is the same or there is no distinction between the front and back, then the front and back cannot be distinguished. A form of three-sided seal packaging with essentially only top and bottom seals is realized.

Next, 1 is usually used as the seam sealing tape T.

A tape mainly made of a heat-resistant film made of the same material as the bag film F is used, and both sides of the tape are overcoated with a heat-fusible film. In this case, the police department recommends that the bag be opened at a point where the seam sealing tape T is wide apart, and that the tape is torn in a straight line in the longitudinal direction along the butt of the film edges f and f. As the main body, use a heat-resistant film that can be torn in a straight line in the vertical direction, or use a film that has lower tear strength than a single-bag film, and tear at the edge of the horizontal seal portion at a position corresponding to the seam sealing tape. It is better to include a cut for use.

As another method, in order to open the bag along the vertical seal, the seam sealing tape T is made of a heat-resistant film that can be torn in a substantially straight line in the vertical direction. A yarn with high tensile strength is stretched in the center of the width direction and is overcoated with a thermofusible film, and
Make a necessary indentation in the horizontal seal part so that the end of the chain string can be grasped, or use the inner surface of the tape main body made of a heat-resistant film that can be torn in a substantially straight line in the vertical direction as a seam sealing tape T. A film-like strip wire with high tensile strength is stretched in the center in the width direction and overcoated with a thermofusible film. It's good to be able to grasp it.

[Effects of the Invention] As explained above, according to the vertical bag-forming-fill-packaging method of the present invention, ■Although the film for bags used in the three-sided seal packaging is used, it can be used in the three-sided envelope-type packaging. It is possible to realize a packaging form equivalent to sticker packaging, and the disadvantages of envelope-type three-sided sticker packaging, such as poor print clarity and easy scratching, are solved, and the outer surface of the bag film is overlaid with thermoplastic film. Since it is not coated, beautiful vertical and horizontal seals can be achieved.

■Compared to the conventional three-sided seal packaging, the packaging is more beautiful and the bag film requires less convergence, reducing the cost of a single bag film.

■Since it is possible to print on the convergence of the bag film, by making sure that the printed portions of the seams of the vertical seals are continuous, it is possible to realize a three-sided seal packaging format in which there are only upper and lower horizontal seals when viewed from the outside.

[Brief explanation of drawings]

1 to 4 show a vertical form-fill-seal machine for carrying out the vertical form-fill-seal method of the present invention, in which Fig. 1 is a side view, Fig. 2 is a front view, and Fig. 3 is a ■ in Figure 2
-■ sectional view, FIG. 4 is a sectional view taken along IV-1'V in FIG. FIG. 5 is a back view of a three-side seal packaging bag manufactured by the above vertical form-fill-seal packaging machine, and FIG. 6 is a back view of another three-side seal packaging bag manufactured by the above-mentioned vertical form-fill-seal packaging machine. It is a diagram. 1...Former 2...Product filling tube, F...Bag film, fllll/film edges to each other, H-Fist/packaging tube, Tφ...Seam sealing tape W...Item to be packaged , A dispute: Φ vertical seal, Bφ...horizontal seal, patent applicant Kawashima Seisakusho Co., Ltd.

Claims (7)

[Claims] (1) A continuous belt-shaped bag film whose inner surface is overcoated with a thermoplastic film is guided to a former, and the edges of the film are aligned with the front side of a product filling tube inserted through the former to fill the product. The film is bent into a cylindrical shape to wrap around the cylinder, and the film is fed downward continuously or intermittently, and the edges of the film guided to the front side of the product filling cylinder below the former are vertically sealed to form a packaging cylinder, and , in a vertical bag-form-fill-packaging method in which the upper and lower sides of the packaged items to be dropped and filled through the product-filling cylinder of the packaging cylinder are sealed horizontally, by making the bag film have a required width, the film is formed on the front side of the product-filling cylinder. The edges of the film are brought into close contact with each other, and a seam sealing tape of the required width, which is thermofusible on both sides, is placed on the front side of the product filling cylinder above the former so that it overlaps the inside of the butted edges of the film. When the vertical sealing is performed, the edges of the film are sealed together without any gaps by the seam sealing tape to form a packaging cylinder. (2) As the seam sealing tape, a tape mainly made of a heat-resistant film that can be torn in a substantially straight line in the longitudinal direction is overcoated with a heat-fusible film on both sides. The vertical bag making and filling packaging method described in . (3) The main body of the tape is a material having a tear strength lower than that of the bag film.
The vertical bag making and filling packaging method described in . (4) The vertical bag making, filling and packaging method according to any one of claims 1 to 3, characterized in that a tearing cut is made at a position corresponding to the seam sealing tape on the edge of the horizontally sealed portion. . (5) As the seam sealing tape, a thread with high tensile strength is stretched in the widthwise center of the inner surface of the tape main body, which is made of a heat-resistant film that can be torn in a substantially straight line in the longitudinal direction, so that the thermofusible film is overlaid. 2. The vertical bag making, filling and packaging method according to claim 1, wherein a coated yarn is used and a required indentation is made in the horizontal seal portion so that the end of the yarn can be grasped. (6) The seam sealing tape is made of a heat-resistant film that can be torn in a substantially straight line in the longitudinal direction, and a film-like band wire with high tensile strength is stretched in the widthwise center of the inner surface of the tape main body, which is heat-soluble. 2. The vertical form-fill-fill packaging according to claim 1, wherein an overcoated film is used, and a required protrusion is made in the horizontal seal portion so that the end of the film-like band wire can be grasped. Method. (7) The horizontal seal is performed by tilting at a required angle in a horizontal plane with respect to the front-rear direction of the product filling cylinder, and the vertical seal on the packaged product is biased toward one end of the horizontal seal. The vertical bag form-fill packaging method according to any one of the items.