JP2016068946A - Producing method of packaging bag comprising back jointing part and filling/packaging machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a producing method of a packaging bag comprising back jointing part capable of effectively suppressing meandering of packaging film to prevent generation of offset of the back jointing part and to provide a filling/packaging machine using the method.SOLUTION: There is provided a producing method of a packaging bag W comprising side by side back jointing parts consisting of both edges of packaging film F fed in longitudinal direction pasted each other. The method comprises: a step of folding the packaging film at center part and successively forming a longitudinal seal part 7 on the side edge part to make a cylindrical shape; a step of spreading the packaging film with guide by a guide rod 8 arranged in cylindrical packaging film in vertical direction relatively to traveling direction so that the longitudinal seal part is positioned at center part of the packaging film; and a step of forming a lateral seal part 9 extending on entire with in direction orthogonal to longitudinal direction of the packaging film with intervals in longitudinal direction of the packaging film while filling up it with a covering object.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for manufacturing a packaging bag having a palm-like back-bonded joint, and a filling and packaging machine using this method.

  Widely used is a packaging bag in which a flexible packaging film is molded into a bag shape and filled with liquids such as foods and drinks, seasoning liquids, pharmaceuticals, and cosmetics, viscous or powdery, granular materials, and other packages. ing.

  Such a packaging bag is manufactured by, for example, a filling and packaging machine described in Patent Document 1. That is, a sealant layer includes a packaging film having a laminated structure of a uniaxial or biaxially stretched base film layer and an unstretched sealant layer, or a packaging film having a single layer structure in which a base film layer is part-coated with a heat-sensitive adhesive layer. Alternatively, it is folded at the center so that the heat-sensitive adhesive layer is on the inside, and the side edge portions of the folded film are overlapped, heated and pressed by a pair of vertical seal rolls, sent to each other while being welded together, and extended in the longitudinal direction. By forming the existing vertical seal portion, the packaging film is formed into a cylindrical shape.

  Next, the cylindrically formed film is heated and pressurized sequentially by a plurality of heat seal bars positioned at equal intervals in the circumferential direction around each of the pair of horizontal seal rolls of the horizontal seal device. Three-side seal-type packaging is formed by intermittently forming transverse seal portions extending in the width direction of the packaging film at intervals in the longitudinal direction of the packaging film, while being sent downward while being welded to each other. The bag will be made.

  In recent years, a packaging bag in which an object to be packaged can be easily taken out has been proposed. For example, Patent Document 2 provides a pouring passage for an article to be packaged in which an easily peelable portion is formed in a palm-like back-bonded joint, and is folded in two around the back-bonded joint. There has been disclosed a packaging bag in which a packaged object can be easily poured out with a small pressing force by pressing a filling space of the package.

JP 04-114841 A JP 2013-169991 A

  By the way, a packaging bag having a back-bonded joint can be manufactured by winding a packaging film around a cylindrical sailor member in a vertical pillow packaging machine or the like, but the sailor member is used. In the method, since the frictional force is large, the overlapping accuracy of the side edges of the vertical seal portion is deteriorated and the ear misalignment is likely to occur. It cannot be used for the manufacture of packaging bags that require high overlapping accuracy between the side edges. This is also a problem because the film tension becomes too high, especially during high speed filling.

  Therefore, in the present invention, while using a conventional filling and packaging machine such as Patent Document 1, it is possible to effectively suppress meandering of the packaging film and prevent the occurrence of ear misalignment of the back-bonded joint, And it aims at providing the manufacturing method of the packaging bag which has a back bonding junction part suitable also for high-speed filling driving | running | working, and the filling packaging machine using the method.

  Among the researches for realizing the above object, the inventor is a method for manufacturing a packaging bag having a palm-like back-bonded joint formed by bonding both side edges of a packaging film traveling in the longitudinal direction. Wrapping the packaging film at the center so that the adhesive layer or the sealant layer is opposed to each other, and forming a longitudinal seal portion continuously in the longitudinal direction of the packaging film at the side edge portion to form a cylinder And spreading the packaging film in a direction perpendicular to the running direction by guiding a guide rod disposed in the cylindrical packaging film, and positioning the vertical seal portion at the center of the packaging film; In the longitudinal direction of the packaging film, a transverse seal portion extending over the entire width of the packaging film is filled in the direction perpendicular to the longitudinal direction of the packaging film while filling the packaged article in the cylindrical packaging film. Found that forming at a septum, manufacturing method of the packaging bag having a back lined joint and having a is valid and led to the development of the present invention.

In addition, about the formation method of the said back bonding junction part of this invention, it becomes a more preferable solution means to set it as the following structures further. That is,
(1) The guide rod has a shape divided into two so that the lower part gradually expands from each other;
(2) The length between the ends of the two divided guide rods is the inner width of the packaging bag,
(3) The lower part of the guide rod is bent toward the vertical seal part.
It is.

In addition, the present invention wraps the packaging film fed out from the raw fabric roll at the center so that the adhesive layer or the sealant layer faces each other, and continuously on the side edge portion in the longitudinal direction of the packaging film. A vertical sealing means for forming a vertical seal portion into a cylindrical shape, and a packaging film in a direction perpendicular to the longitudinal direction of the packaging film while filling the cylindrical packaging film with a liquid package In a filling and packaging machine comprising: a transverse seal portion extending across the entire width of the packaging film, and a transverse seal means for forming a package by forming an interval in the longitudinal direction of the packaging film;
A guide rod for spreading the cylindrical packaging film in a direction perpendicular to the traveling direction between the vertical sealing means and the horizontal sealing means, and positioning the vertical sealing portion at the center of the packaging film. Proposed is a filling and packaging machine.

In the filling and packaging machine of the present invention, the following configuration is a more preferable solution. That is,
(1) The guide rod has a shape divided into two so that the lower part gradually expands from each other;
(2) The length between the ends of the two divided guide rods is the inner width of the packaging bag,
(3) The lower part of the guide rod is bent toward the vertical seal part.
(4) It has a tension measuring means for the traveling packaging film between the original roll and the vertical sealing means, and the packaging film from the original roll based on the measured value of the tension measuring means Controlling the feeding speed of the
It is.

  In the manufacturing method of the packaging bag having the back-bonding joint portion of the present invention (hereinafter, also simply referred to as “back-bonding packaging bag”) and the filling and packaging machine using the same, the packaging film is folded and overlapped at the center portion. After forming a vertical seal portion on the side edge portion into a cylindrical shape, the packaging film is placed in a direction perpendicular to the traveling direction by guiding a guide rod disposed in the cylindrical packaging film. By spreading, the vertical seal portion can be positioned at the central portion of the packaging film, that is, the back-bonded joint portion, and in this state, in the direction orthogonal to the longitudinal direction of the packaging film, A back-wrapped packaging bag can be formed by forming a horizontal seal portion extending over the entire width of the packaging film using a horizontal seal plate or the like. That is, according to the present invention, a back-packed packaging bag can be formed simply by adding a guide rod to a conventional filling and packaging machine.

  The guide rod preferably has a shape divided into two so that the lower portion gradually expands from each other. According to this, the traveling cylindrical packaging film is perpendicular to the traveling direction. In addition, the guide rod has a small contact area with the packaging film, so the frictional force is small, causing the packaging film to meander or cause wrinkles or damage to the packaging film. The tension of the packaging film can be properly maintained even in high-speed filling packaging. This effect is further exhibited when the length between the two separated guide rod ends is matched to the inner width of the tubular packaging film (the inner width of the packaging bag). Thus, it is possible to guide the vertical seal portion so that it is always positioned at the center portion (back pasting position) of the cylindrical packaging film.

  Further, according to the present invention, the lower part of the guide rod is bent toward the longitudinal seal portion side, so that the cylindrical packaging film is pressed while being pressed at two positions of the guide rod bent position and the tip end position. Since the packaging film can be spread in a direction perpendicular to the traveling direction, the packaging film does not meander, and a non-defective backed packaging bag can be stably produced. In addition, if the bending width of the lower part of the guide rod is set to 1/3 to 1/2 of the inner dimension width of the cylindrical packaging film at the tip of the guide rod, the above effect can be exhibited more effectively.

  Further, according to the filling and packaging machine of the present invention, a tension measuring means for the traveling packaging film is provided between the raw roll of the packaging film and the vertical sealing means, and based on the measured value, By increasing and decreasing the feeding speed of the packaging film from the raw roll (controlling the number of rotations of the feeding roll), the tension of the packaging film can be constantly stabilized. It is possible to prevent the misalignment of the vertical seal portion formed by bonding the side edges of the packaging film. According to this, even in a packaging bag in which a pouring passage is provided in the back-bonded joint as in Patent Document 2, there is no ear drift at the spout, so there is no occurrence of dripping and the object to be packaged is It is possible to accurately discharge to the position. Also, the tension of the packaging film can be kept appropriate even during high-speed filling running.

(A) And (b) is the front view and side view which show the structure of the vertical filling packaging machine as one Embodiment of the filling packaging machine of this invention. (A) And (b) is the front view and side view which show the shape of a guide rod. It is a figure explaining the method of controlling the feed rate from an original fabric roll with the tension | tensile_strength of the film for packaging.

  FIG. 1 is a schematic diagram showing a configuration of a vertical filling and packaging machine as an embodiment of the filling and packaging machine of the present invention. The manufacturing method of the back-packed packaging bag according to the present invention is not limited to such a vertical filling and packaging machine, but includes various types such as a vertical pillow filling and packaging machine, a horizontal pillow filling and packaging machine, and a multi-row filling and packaging machine. It can be used for packaging machines.

  The vertical filling and packaging machine shown in FIG. 1 is a sheet of a laminated film in which, for example, a base film layer made of a biaxially stretched nylon film, a polyethylene terephthalate film, etc., and a sealant layer made of, for example, various polyethylene resins are laminated. While continuously running a long packaging film in the longitudinal direction, it is folded back in the width direction so that the sealant layers face each other, and the both side edges are overlapped, so that many packaging films The packaged items made of fluid materials such as foods, seasonings, medicines, cosmetics and other liquids, viscous or jelly are automatically produced in each packaging bag. As shown in the figure, the film guide part 1, the film folding part 2, the vertical seal part forming part 3 and the supply of the package are mainly provided. 4, a first horizontal seal portion forming portion 5 a and a second horizontal seal portion forming portion 5 b as horizontal seal portion forming portions, and a cutting portion 6 for cutting the packaging bag W into single packages or multiple packages. I will. In addition, the 1st horizontal seal part formation part 5a and the 2nd horizontal seal part formation part 5b can be comprised by a pair of seal roll, a seal plate, etc.

  In such a vertical filling and packaging machine, the packaging film F is formed into a cylindrical shape after the vertical seal portion 7 is formed by the seal between the side edges in the vertical seal portion forming portion 3 and then becomes cylindrical. The guide rod 8 arranged on the inner side of the film F spreads in a direction perpendicular to the traveling direction of the packaging film F (left and right in FIG. 1 (a)), whereby the vertical seal portion 7 becomes the packaging film. It will be located at the center of F.

  And in this state, the packaging bag W which has a back bonding junction part can be manufactured by forming the horizontal seal part 9 by the 1st horizontal seal part formation part 5a and the 2nd horizontal seal part formation part 5b. .

  The guide rod 8 may have any shape as long as the cylindrical packaging film F can be expanded in a direction perpendicular to the traveling direction. For example, two independent rods are used, and as shown in the front view of FIG. 2A, the lower portions of the rod-shaped guide rods 8 are gradually expanded from the bent portion 8a. When the guide rod 8 is located in the cylindrical packaging film F, the friction force between the packaging film F and the guide rod 8 is small when the guide rod 8 is divided into two shapes. 8 can be prevented from being damaged by being caught on the packaging film F, and the packaging film F is gradually spread in a direction perpendicular to the traveling direction. Therefore, the packaging film F does not meander or wrinkles, and the vertical seal portion 7 can be reliably positioned at the center of the packaging film F.

  Further, the distance between the two separated ends of the guide rod 8 is preferably matched to the inner size width of the packaging bag to be manufactured, and according to this, the meandering of the packaging film F can be more effectively suppressed. .

  Moreover, if the lower part of the guide rod 8 is bent to the vertical seal portion 6 side as shown in the side view of FIG. 2B, the traveling tubular packaging film F is bent to the guide rod 8. While being pressed at the two portions of the portion 8a and the tip portion 8b, the packaging film F can be pushed and spread in a direction perpendicular to the running direction of the packaging film F, so that the meandering of the packaging film F can be further suppressed. In addition, if the bending width D of the guide rod 1 is set so that the front end of the guide rod 8 is 1/3 to 1/2 of the inner dimension width of the packaging bag, the above effect can be more effectively exhibited. it can.

By the way, in the case where a pouring passage is provided on the back-bonded joint composed of the vertical seal portion 7, in order to suppress the occurrence of liquid dripping of the packaged material from the pouring passage and to improve the discharge directionality, In forming the vertical seal portion 7, it is necessary to accurately overlap the side edges of the packaging film F.
Therefore, a tension measuring means for detecting the tension of the packaging film as a pressing force, for example, composed of a normal load cell, for example, in the film guide portion 1 between the original roll of the packaging film F and the vertical sealing means 3. 10 is preferably provided. According to this, as shown in FIG. 3, the tension measuring means 10 measures the tension of the packaging film F applied to the film guiding section 1, and based on this measured value, it consists of a normal computer that inputs the output signal of the load cell. A package that travels along the vertical seal portion 7 by variably controlling the rotational speed of the drive motor 12 of the feed roll composed of the nip roll R located between the film guide portion 1 and the original fabric roll according to the output signal of the tension meter 11. The tension of the film F can be controlled appropriately.

  That is, when the tension of the packaging film F is higher than the predetermined range, the rotational speed of the nip roll R is increased, the supply speed of the packaging film F is increased, and the tension of the packaging film F is lower than the predetermined range. Reduces the supply speed of the packaging film F by lowering the rotational speed of the nip roll R. According to this, since the tension of the packaging film F can always be stabilized, the meandering of the packaging film F can be prevented, and the occurrence of the ear misalignment of the side edge of the vertical seal portion 7 can be prevented. The tension of the packaging film F can be kept appropriate even during high-speed filling running.

DESCRIPTION OF SYMBOLS 1 Film guide part 2 Film folding | returning part 3 Vertical seal | sticker part formation part 4 Package supply part 5a 1st horizontal seal part formation part 5b 2nd horizontal seal part formation part 6 Cutting part 7 Vertical seal part 8 Guide rod 9 Horizontal Sealing part 10 Pressure measuring means 11 Tension meter 12 Drive motor F Packaging film R Nip roll W Packaging bag

Claims (9)

It is a method for manufacturing a packaging bag having a palm-like back-bonding joint formed by laminating both side edges of a packaging film fed out in the longitudinal direction,
Folding the packaging film at the center so that the adhesive layer or sealant layer opposes, and forming a longitudinal seal portion in the longitudinal direction of the packaging film at the side edge portion to form a cylinder; ,
Expanding the packaging film in a direction perpendicular to the running direction by guiding a guide rod disposed in the tubular packaging film, and positioning the vertical seal portion at the center of the packaging film;
While filling the cylindrical packaging film with an article to be packaged, in the direction perpendicular to the longitudinal direction of the packaging film, a transverse seal portion extending over the entire width of the packaging film is disposed in the longitudinal direction of the packaging film. Forming at intervals, and
The manufacturing method of the packaging bag which has a back bonding junction part characterized by having.   2. The method of manufacturing a packaging bag having a back-bonded joint according to claim 1, wherein the guide rod has a shape divided into two so that the lower portions gradually expand from each other.   The method for producing a packaging bag having a back-bonded joint according to claim 2, wherein the length between the end portions of the two divided guide rods is the inner width of the packaging bag.   The method for producing a packaging bag having a back-bonded joint according to any one of claims 1 to 3, wherein the guide rod has a lower portion bent toward the vertical seal portion. The packaging film fed out from the raw fabric roll is folded back at the center so that the adhesive layer or sealant layer faces each other, and a longitudinal seal portion is continuously formed in the longitudinal direction of the packaging film at the side edge portion. Vertical sealing means to be cylindrical,
While the liquid packaging material is filled in the cylindrical packaging film, a transverse seal portion extending over the entire width of the packaging film in the direction orthogonal to the longitudinal direction of the packaging film is provided in the longitudinal direction of the packaging film. Lateral sealing means for forming a package by forming a gap in the direction;
In a filling and packaging machine comprising:
A guide rod for spreading the cylindrical packaging film in a direction perpendicular to the traveling direction between the vertical sealing means and the horizontal sealing means, and positioning the vertical sealing portion at the center of the packaging film. A filling and packaging machine comprising:   6. The filling and packaging machine according to claim 5, wherein the guide rod has a shape divided into two parts such that lower portions gradually expand from each other.   The filling and packaging machine according to claim 6, wherein a length between ends of the two divided guide rods is an inner width of the packaging bag.   The filling and packaging machine according to any one of claims 5 to 7, wherein a lower portion of the guide rod is bent toward the vertical seal portion.   Between the original fabric roll and the vertical seal means, there is a tension measuring means for the traveling packaging film, and based on the measured value of the tension measuring means, the feeding speed of the packaging film from the original fabric roll The filling and packaging machine according to claim 5, wherein the filling and packaging machine is controlled.

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