JPH05254517A - Opening method of gusset bag - Google Patents

Abstract

PURPOSE:To make it possible to open a gusset bag to have a square form and provide a folded mold at the ears, by adsorbing both sides of the opening of bag and opening it and fastening the both opening ends, then pushing a bag-opening block into the bag to form a square form and further, by closely attaching a heater under the bag to heat with pressure the ear so as to laterally fold it in cooperation with the bag-opening block. CONSTITUTION:A gusset bag W is opened by sucking both outer faces on the opening side W1 of the gusset bag W through vacuum pads 1, 1 and then held by chucks 2, 2. Next, a bag-opening block 3 is pushed into the bag W. When the bag-opening block 3 is pushed up to the bottom of the bag W, the bag W is opened to form nearly a square bag. In this way, the sealed ear W2 besides the bag is slanted to the counter side against the back sticking seal W3. Next, a heater 4 is pressed at the underface of the bag W and the ear W2 is pressed and heated between the ear and the bag-opening block 3 in the folded condition of the ear.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag filling in a bag filling and packing method, in which a gusset bag is opened into a square floor bag form in which a substantially square floor is obtained, and the ground-sealed ears of the bag are laid sideways. The present invention relates to a method of opening a gusset bag that gives a folding tendency to a folded state.

[0002]

2. Description of the Related Art In a bag-filling and packaging machine, a gusset bag made of a flexible packaging film having a heat-sealing property is used. The bag supply filling and packaging machine supplies a gusset bag to a predetermined position, fills a food or the like, and seals the bag. The bag-filling and packaging machine requires a means for expanding a gusset bag folded in a flat shape to form a square floor bag. However, conventionally, as a method of expanding the gusset bag and forming it into a square floor bag, some methods are performed as described below. The first is to adsorb both sides of the outer surface of the gusset bag with a pair of vacuum pads, expand the vacuum pad interval to open the gusset bag, and then insert an air injection nozzle from the opening to expand the air injection bag. It is uncertain to use a square floor bag. The second is the method disclosed in Japanese Utility Model Publication No. 57-21510. This technology forms a three-sided seal bag instead of a gusset bag so that it becomes a square-floor bag.It blows air toward the upper opening of the bag to expand the opening, then lowers the tubular body to lower the bag. It is a method of forming a square floor bag by inserting a pair of beaks constituting the tubular main body into the square floor bag after being inserted into the hollow body, and it is uncertain to form the square floor bag. The third is the actual exploitation Sho 58-8.
8305 method. This method also uses a three-sided seal bag instead of a gusset bag as a square floor bag, and a method in which each pair of movable fingers is inserted from the bag opening, and it is also uncertain to use a square floor bag.

The applicant of the present application has proposed a device called a mandrel of a bag-filling and packaging machine which can eliminate the bulge on the side surface of the bag when all the three conventional examples are filled with the object to be packaged. Issued and received utility model registration (Actual Fair No. 02-28167).

[0004]

However, a method of opening any conventional gusset bag to form a square floor bag (including the case of using the mandrel of the bag-filling and packaging machine according to JP-B-02-28167). Is strong in maintaining the hanging state of the ears, which is the ground seal part, when using a strong packaging film, the corner floor surface is poorly seated when placed on a pallet, the bag tilts, and the filling stay Occasionally, an error occurred when filling the packaged items. Therefore, there is a demand for the development of a method capable of opening a gusset bag that can keep the ears, which are the ground seal portions, in a state of being laid sideways so as to be a square floor bag.

The present invention has been devised in view of the above-mentioned points, and in the bag filling in the bag filling filling and packaging method, the gusset bag is opened in a square floor bag form capable of obtaining a substantially square floor and the bag is ground-sealed. It is an object of the present invention to provide a method for opening a gusset bag in which the formed ears are bent laterally to create a crease.

[0006]

As a means for solving the above-mentioned problems, the present invention supplies a gusset bag W having a heat-sealing property to a predetermined position, and the upper both surfaces on the opening side of the gusset bag W. The pair of vacuum pads 1 and 1 to separate the pair of vacuum pads 1 until the gusset is substantially extended to open the opening end W1 in a substantially rectangular shape, and then to open the opening end W1 of the gusset bag W in a pair. The gusset bag W is chucked by the chucking devices 2 and 2, and subsequently, the lower part has an inverted quadrangular pyramid shape and the maximum horizontal cross section has the size.
The bag opening block 3 which is slightly smaller than the substantially rectangular shape of the opened opening end W1 is pushed into the bag opening, is inserted to the bottom of the bag W, and is opened into a substantially rectangular bag. After the block 3 reaches the bottom of the bag W and the ear portion W2 of the bag W, which is ground-sealed, is inclined to the opposite side of the back sticker W3 of the bag W, a heater 4 is attached to the lower surface of the bag W to close the bag opening block 3. The ears W2 are jointly pressed and heated in a laterally folded state to fix the laterally folded shape of the ears W2, and the left and right bag front surfaces serving as the bottoms of the rectangular bag W and the triangular shape of the gusset surface. A method for opening a gusset bag, characterized in that the overlapping parts W4, W4 and the triangular overlapping parts W5, W5 of the bag rear surface and the gusset surface are heat-bonded, and then the bag opening block 3 is relatively pulled out from inside the bag. Is provided.

[0007]

EXAMPLE An example of a method for opening a gusset bag according to the present invention will be described with reference to FIGS. 1 (a) to 1 (f) and FIG. This gusset bag W is opened by opening the bag-shaped gusset bag W shown in FIG. 1 (a) into a square floor bag shown in FIG. 1 (b) that can be filled with an object to be packaged. In this method, the ground-sealed ears W2 of the bag W are bent laterally to give a crease and improve the seatability. This corner floor bag W has the largest gusset and a square horizontal cross section.

In the method for opening the gusset bag W, as shown in FIG. 2A, first, a gusset bag W made of a heat-bondable film or laminated on the inner surface of the gusset bag W is used as a pair of vacuum pads. 1 and 1, and the upper surface on the opening side of the gusset bag W is adsorbed by a pair of vacuum pads 1, 1 and, as shown in FIG. Vacuum pad 1,1
Are separated from each other to open the opening end W1 in a substantially rectangular shape.
Next, the opening end W1 of the gusset bag W is opened by the pair of chuck devices 2 provided so as to contact the opening end W1 of the bag W.
Chuck. Subsequently, as shown in FIG. 2C, the pair of vacuum pads 1 and 1 release the suction, and the bag opening block 3 waiting above is lowered to open the bag. Since the lower portion of the bag opening block 3 has an inverted quadrangular pyramid shape and the maximum horizontal cross section has a shape slightly smaller than the substantially rectangular shape of the open end W1 of the gusset bag W, the bag opening block 3 is opened. You can enter inside smoothly. The bag opening block 3 pushes and expands the flat portion of the bag by the wedge action of the inverted truncated pyramid shape as it enters the bag. In the case of a bag having a strong rigidity, air can be effectively opened by sending air through the support pipe 5 of the bag opening block 3. As shown in FIG. 2D, the bag opening block 3 further enters the bottom of the bag W to form a corner floor. Along with this, the pair of vacuum pads 1, 1 descend to a height corresponding to the bag bottom. It should be noted that two pairs of vacuum pads may be provided above and below to share the work. Subsequently, when the bag opening block 3 reaches the bottom of the bag W, as shown in FIG. 1 (b), the ground-sealed ears W2 of the bag W are inclined to the opposite side of the back sticking seal W3 of the bag W. As shown in FIG. 2 (e), a heater 4 is closely attached to the lower surface of the bag, and in cooperation with the bag opening block 3, the ear portion W2 is crimped and heated in a state where the ear portion W2 is folded sideways so that the ear portion W2 is folded sideways. The shape of the square bag W is fixed, and the left and right bag front surfaces serving as the bottoms of the square bag W and the triangular overlapping portions W4 and W4 of the gusset surface and the triangular overlapping portions W5 and W5 of the bag rear surface and the gusset surface are heat-bonded. .. Thereafter, as shown in FIG. 2 (f), the lower pair of side surfaces of the corner floor bag W are adsorbed by the pair of lowered vacuum pads 1 and 1, and the pair of chuck devices 2 and 2 are unchucked to open the bag. Lift the block 3 and pull it out of the bag. It should be noted that the lifting of the bag opening block 3 from the inside of the bag may be relatively performed. After that, the corner floor bag W supported by the pair of vacuum pads 1 and 1 descends and is placed on a pallet (not shown) circulating in the lower direction and transferred to the filling station. This is the end of the bag opening process.

Between the step shown in FIG. 2 (d) and the step shown in FIG. 2 (e), the corner crease step of four sides of the corner floor shown in FIGS. 3 (a) to 3 (d) may be inserted. That is, it is not necessary to immediately perform the ear folding when the bag opening block 3 enters the bag and opens the bag, and the bag opening block 3 is pulled out once to make creases on four sides of the corner floor, and then the bag opening is performed again. You may enter the block 3 in a bag and perform an ear fold. Note that FIG.
The steps of scoring the four corners of the square floor shown in (d) to (d) will be briefly described. First, as shown in FIG. 3 (a), thin scoring scoring plates 9 having a spring property are hung down on four sides of a bracket 8 which guides the support rod 7 of the scoring scoring plate movable block 6 in a vertically movable manner. The bracket 6 and the folding score plate 9 hanging down in four directions are inserted into the bag, and when the folding score plate 9 reaches the bottom, as shown in FIG. The open end W1 is chucked. Next, as shown in FIG. 3 (c), the fold-out plate movable block 6 is lowered by a required dimension x to push an intermediate projection of the fold-out plate 9 outward by a wedge action to push the fold-out plate. The lower end of 9 is expanded and the four sides of the square floor of the bag W are strongly tensioned to make folds on all four sides. Then, as shown in FIG. 3D, the folding score plate movable block 6
Is lifted up by a required amount to return the lower end of the crease plate 9 inward, the pair of chuck devices 10 and 10 are dechucked, and the lower side surface of the bag W that has become a square floor bag with the pair of vacuum pads 1 and 1. Is sucked, and the bracket 8 and the crease plate 9 hanging in all directions are pulled out from the bag W.

[0010]

As described above, according to the method for opening a gusset bag of the present invention, regarding the bag feeding in the bag filling and packing method, the gusset bag is opened in the shape of a square floor bag which can obtain a substantially square floor. It is possible to form a crease in a state in which the bag-sealed and locally-sealed ears of the bag are folded laterally.

[Brief description of drawings]

FIG. 1A is a schematic perspective view of a gusset bag according to the present invention during bag making, and FIG. 1B is a schematic perspective view of FIG.

FIG. 2A to FIG. 2F are process charts of a main part of a method for opening a gusset bag according to an embodiment of the present invention.

3 (a) to 3 (d) are process diagrams illustrating that creases are made on four sides of a square floor of a gusset bag according to an embodiment of the present invention.

[Explanation of symbols]

W ・ ・ ・ Gusset bag, W1 ・ ・ ・ Open end, W2 ・ ・ ・ Ground-sealed ears, W3 ・ ・ ・ Back sticker, W4 ・ ・ ・ Triangular overlapping part of bag front and gusset surface, W5 ... Triangular overlapping part of bag back surface and gusset surface, 1 ... vacuum pad, 2 ... chucking device, 3 ... bag opening block, 4 ... heater,

Claims (1)

[Claims] 1. A gusset bag having a heat-sealing property is supplied to a predetermined position, and both upper surfaces on the opening side of the gusset bag are adsorbed by a pair of vacuum pads to separate the pair of vacuum pads until the gusset is substantially extended. To open the open end into a substantially rectangular shape, then chuck the open end of the gusset bag with a pair of chucking devices, and subsequently the lower part has an inverted quadrangular pyramid shape and the maximum horizontal cross-sectional size is the gusset bag. Press the bag opening block, which is one size smaller than the rectangle at the open end of the bag, into the bag opening, open the bag so that it becomes a square bag, and then open the bag block. After the bottom of the bag reaches the bottom of the bag and the ears of the bag are tilted to the opposite side of the back sticker of the bag, a heater is attached to the bottom of the bag and the ears are folded sideways in cooperation with the bag opening block. By pressing and heating While fixing the bent shape of the ears sideways, heat-bond the triangular overlapping parts of the left and right bag front surfaces and the gusset surface, which are the bottom of the square bag, and the triangular overlapping parts of the bag rear surface and the gusset surface. A method for opening a gusset bag, characterized in that the bag opening block is then relatively pulled out from the bag.