JPH04367405A - Width direction heat-welding device for long cylindrical bag in automatic packaging device - Google Patents

Abstract

PURPOSE:To perform heat-welding assuredly while preventing wrinkles at the heat- welded part from happening, and make the appearance of a packaged article better by a method wherein after stretching flatly both ends parts in the width direction of a long cylindrical bag by pulling them outward in the width direction, the stretched parts are heat-welded by both width direction heat-welding members. CONSTITUTION:A pinching-stretching member 6 with elasticity is provided on both width direction heat-welding members 5 which pinch and heat-weld in the width direction from both sides of a long cylindrical bag 1, so that the pinching-stretching members 6 pinch both end parts 1d of a part to be heat-welded of the long cylindrical bag 1 and stretch outward in the width direction before both width direction heat- welding members 5 heat-weld the long cylindrical bag 1 in the width direction. After the long cylindrical bag 1 has been heat-welded in the width direction, an article to be packaged is thrown in the long cylindrical bag 1, and the top part of the bag is heat-welded in the width direction, and the long cylindrical bag 1 in which the article to be packaged has been put is moved downward by a specified length, and heat-welding in the width direction is performed.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is directed to heat-welding a long cylindrical bag made of, for example, synthetic resin or a laminate sheet material such as aluminum foil and plastic sheet or paper and plastic sheet, after heat-welding it in the width direction. The object to be packaged is put into this long cylindrical bag, the upper part of the bag is heated and welded in the width direction, the long cylindrical bag containing the object to be packaged is moved downward by a predetermined length, and the same process as described above is carried out. The present invention relates to a width direction heat welding device for long tube bags in an automatic packaging device that sequentially performs heat welding.

0002

[Prior Art] FIG. 7 is a schematic diagram of a conventional automatic packaging device, in which numeral 11 denotes a long tube bag that can be heat-welded;
After the longitudinal center portion 11b of 1a is folded in half,
The guide roller 12 hangs and guides the hopper 13 containing the packaged material in the direction along the discharge port 13a, and the discharge port 13a is an open end portion where the longitudinal center portion 11b of the strip film 11a is folded in half. The open end 11c is heat welded in the longitudinal direction by the longitudinal heat welding members 14, 14, which are inserted into the open end 11c and heat welded in the longitudinal direction.
1 is formed.

Reference numerals 15 and 15 denote width direction heat welding members for heat welding the long tube bag 11 in the width direction. After welding and moving it downward a predetermined distance, a predetermined amount of the object to be packaged is put into the long cylindrical bag 11 from the hopper 13 through its discharge port 13a, and the upper part where the object to be packaged is placed. The long cylindrical bag 11 is heat-welded in the width direction using the width-direction heat-welding members 15, 15. Thereafter, automatic packaging of the items to be packaged is performed while successively performing such heat welding and moving the long cylindrical bag 11 downward intermittently. 17,17
is a cutting member that is connected to the long tube bag 11 and cuts the packaged items individually.

0004

[Problems to be Solved by the Invention] However, in the width direction heat welding device of the conventional automatic packaging apparatus, when the article to be packaged is placed in the long tube bag 11, the long tube bag 11 As shown in the plan view of FIG. 8, it swells in an elliptical shape, and this elliptical swollen portion is pressed and heat welded by the widthwise heat welding members 15, 15, so that the heat welded portion 11d is As shown in FIG. 9, the package is wrinkled and heat-welded, resulting in not only incomplete heat-welding at the heat-welded portion but also poor appearance of the package.

[0005]

[Means for Solving the Problems] The present invention aims to solve the above-mentioned problems, and after heating and welding a heat-weldable long cylindrical bag in the width direction, an article to be packaged is put into the long cylindrical bag. The upper part of the bag is heated and welded in the width direction, and the long cylindrical bag containing the item to be packaged is moved downward by a predetermined length, and the width is determined by an automatic packaging device that heat-welds the upper part in the width direction. The directional heat welding device is a directional heat welding device that includes a long cylindrical heat welding member that is configured to heat weld a long tube bag by pressing it in the width direction from both sides. The bag is characterized in that, before the tube bag is heated and pressurized in the width direction, an elastic clamping and tensioning member is provided so as to pinch both ends of the heat-welded portion of the long tube bag and pull each other outward in the width direction. It is something.

[0006]

[Embodiment] FIG. 1 is a perspective view of an embodiment of an automatic packaging apparatus equipped with a widthwise heat welding device for long tube bags according to the present invention.
Reference numeral 1 denotes a long cylindrical bag that can be heat-welded, and after the longitudinal central portion 1b of the strip film 1a is folded in half, it is folded by a guide roller 2 in a direction along the outlet 3a of a hopper 3 into which the packaged items are placed. This discharge port 3 is guided by hanging down.
A is a longitudinal heat welding member 4 in which a longitudinal center portion 1b of a strip film 1a is inserted from an open end 1c which is folded in half, and this open end 1c is heat welded in the longitudinal direction.
, 4 are heat-welded in the longitudinal direction to form the elongated cylindrical bag 1.

Reference numerals 5 and 5 denote width direction heat welding members for heat welding the long tube bag 1 in the width direction, and the width direction heat welding members 5, 5 heat weld the long tube bag 1 in the width direction. After moving it downward a predetermined distance, a predetermined amount of the object to be packaged is put into the long tube bag 1, and the long tube bag 1 in the upper part containing the object to be packaged is moved to the above-mentioned width. Directional heating welding member 5
, 5 for heat welding in the width direction. Hereinafter, as in the conventional method, automatic packaging of the object to be packaged is performed while sequentially moving the long tube bag 1 downward intermittently during such heat welding.

The difference between the present invention and the conventional example is that the long tube bag 1 is compressed and heat welded from both sides in the width direction by heat welding members 5, 5 in both width directions; 5 heats and presses the long cylindrical bag 1 in the width direction. Elastic clamping tension members 6, 6 whose portions are fixed to the center portion of the width direction heat welding member 5 are provided facing each other. 7, 7 are cutting members that are connected to the long tube bag 1 and individually cut the packaged items.

FIG. 2 is a perspective view showing in detail the elastic clamping tension members 6, 6 provided on the width direction heat welding members 5, 5, which are the essential parts of the width direction heat welding device for long tube bags of the present invention. In this figure, this clamping tension member 6 has a central part of a leaf spring 6a attached to the central part of a width direction heat welding member 5, and the central part of the leaf spring 6a is
Holding members 6b, 6b for holding both ends 1d, 1d of the heat-welded portion in the width direction of the long tube bag 1 are attached to both ends of the plate spring 6a. A tightening screw 6c passed through the elongated hole 6a' is tightened to an angle member 6d fixed to the center of the width direction heat welding member 5, so that the leaf spring 6a can be mounted in such a way that the mounting position can be adjusted. . The mounting position of the leaf spring 6a can be adjusted in this manner by the clamping member 6b forming the clamping tension member 6 provided on the other widthwise heat welding member 5 facing each other.
．． 6b and the clamping members 6b, 6b forming the clamping tension member 6 provided on one of the width direction heat welding members 5 are not only adjusted so that they are exactly opposite to each other, but also the long tube bag 1
This is because it is possible to select and use a clamping and tensioning member having a widthwise dimension corresponding to the widthwise dimension. Note that the holding members 6b, 6b may be made of any suitable material such as felt material, synthetic rubber, or synthetic resin.

FIG. 3 is a side view of the elongated cylindrical bag 1 before the swollen elliptical portion is compressed and heat welded by the width direction heat welding members 5, 5. 4 is a plan view of this state. FIG. 5 is a side view of the elliptical swollen part of the long tube bag 1, which is pressed and heat-welded by the width-direction heat-welding members 5, 5, and FIG. 6 is a plan view of that state; Before the directional heating welding members 5, 5 heat and press the long tube bag 1 in the width direction, the clamping members 6b, 6 forming the clamping tension members 6, 6
b is both ends 1d of the heat-welded part in the width direction of the long tube bag 1
, 1d and pulling each other outward in the width direction,
Both width direction heat welding members 5, 5 apply heat and pressure to the long tube bag 1 in the width direction to heat weld it.

Next, the operation of the present invention will be explained. The object to be packaged is placed in a long cylindrical bag 1, and this long cylindrical bag 1 is shown in FIG.
Even if the swollen part is elliptical as shown in FIG. A clamping member 6 attached to the tips of plate springs 6a, 6a forming clamping tension members 6, 6 whose central portions are fixed to , 5.
b, 6b, 6b, 6b, as shown in FIG. 5 and FIG. 1 is stretched from an elliptical shape to a flat shape, and then this stretched part is heat welded with the heat welding members 5, 5 in both width directions, so that the heat welded part becomes wrinkled and heat welded as in the conventional method. There is no fear.

0012

According to the present invention, after a heat-weldable long cylindrical bag is heat-welded in the width direction, the object to be packaged is put into the long cylindrical bag and the upper part is heat-welded in the width direction. , a width direction heat welding device for an automatic packaging device which moves the long tube bag containing the article to be packaged downward by a predetermined length and heat welds it in the width direction in the same manner as described above, the width direction heat welding device Before the both width direction heat welding members heat and press the long cylindrical bag in the width direction, An elastic clamping and tensioning member is provided to clamp both ends of the heat-welded portion of the long cylindrical bag and pull them outward in the width direction, so that the object to be packaged cannot be placed in the long cylindrical bag. Even if this long tube bag is swollen in an elliptical shape, before the swollen part is heat welded in the width direction with the heat welding member in both width directions, it is first attached to the heat welding member in both width directions. After the elongated cylindrical bag is stretched from an elliptical shape to a flat shape by pinching both ends of the elongated cylindrical bag in the width direction and pulling each other outward in the width direction by an elastic holding and tensioning member, the stretched portion is are heat welded using heat welding members in both width directions, so this heat welded part does not wrinkle and heat weld as in the past, and as a result, the heat welding part can be reliably heat welded. At the same time, it is possible to improve the appearance of the package.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of an automatic packaging device equipped with a widthwise heat welding device for long tube bags according to the present invention.

FIG. 2 is a perspective view showing in detail the width direction heat welding device for a long tube bag according to the present invention.

FIG. 3 is a side view of the elongated cylindrical bag before being heat welded by the widthwise heat welding device for the elongated cylindrical bag according to the present invention.

FIG. 4 is a plan view of the elongated cylindrical bag before being heat welded by the width direction heat welding device for the elongated cylindrical bag according to the present invention.

FIG. 5 is a side view of a long cylindrical bag that has been heat welded by the widthwise heat welding device for a long cylindrical bag according to the present invention.

FIG. 6 is a plan view of a long cylindrical bag that has been heat welded by the width direction heat welding device for a long cylindrical bag according to the present invention.

FIG. 7 is a perspective view of a conventional automatic packaging device.

FIG. 8 is an explanatory diagram of conventional problems.

FIG. 9 is an explanatory diagram of conventional problems.

[Explanation of symbols]

1 Long tube bag 1a Strip film 1b Central part 1c Open end 1d Both ends 2 Guide roller 3 Hopper 3a Discharge port 4 Longitudinal heating welding member 5 Width direction heat welding member 6 Clamping tension member 6a Leaf spring 6a' long hole 6b Holding member 6c Tightening screw 6d Angle member 7 Cutting member 11 Long tube bag 11a Strip film 11b Central part 11c Open end 12 Guide roller 13 Hopper 13a Discharge port 14 Longitudinal heating welding member 15 Width direction heat welding member 17 Cutting member

Claims (1)

[Claims] Claim 1: After heat-welding a long cylindrical bag that can be heat-welded in the width direction, an object to be packaged is put into the long cylindrical bag, and the upper part of the bag is heat-welded in the width direction. A width direction heat welding device in an automatic packaging device that moves a long tube bag containing a container downward a predetermined length and heat welds it in the width direction in the same manner as described above, the width direction heat welding device constituting the width direction heat welding device. A double-width heat-welding member that presses and heat-welds the long cylindrical bag in the width direction from both sides is used to heat and weld the long cylindrical bag from both sides. 1. An apparatus for widthwise heat welding of long tube bags in an automatic packaging apparatus, characterized in that an elastic clamping and tensioning member is provided so as to sandwich both ends of a heat welded portion and pull them outward in the width direction.