JP2005265694A - Inspecting method of web-like wrapping material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inspection method which enables the in-line inspection on the total number of container products in terms of a seal position of an inner tape, the good detection of the position, and the immediate discharge of a defective product from the line. <P>SOLUTION: The inspection method of a web-like wrapping material is a method of inspecting, during carrying, a web-like wrapping material for a paper container formed with a dispensing punch hole and having a pull-tab and an inner patch film for sealing the punch hole and its peripheral part from the outside and inside. The method comprises the steps of arranging a first gloss sensor and a second gloss sensor, detecting a relative position of an inner patch film end part from a punch hole end part using the first gloss sensor, detecting a carrying right angle direction end part using the second gloss sensor, primarily evaluating a position deviation of the inner patch film, and evaluating the quality of the inner patch film based on the detection of the presence or absence of the carrying right angle direction end part of the inner patch film and the primary evaluation. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to a method for inspecting a web-like packaging material for a paper container having an inner patch film in which a punch hole for a spout is formed and the punch hole and its periphery are sealed from the inside.

Wrapping paper containers that contain beverages such as milk, juice, mineral water, etc. are obtained from web-like packaging laminates with crease lines and printed exterior designs.
The laminated packaging material usually has a thermoplastic material innermost layer (polyethylene resin layer), an aluminum foil layer, a paper layer, and a polyethylene resin outermost layer.
In order to produce a wrapping paper container, the web-shaped packaging laminate material is formed into a tube shape by longitudinal sealing in the longitudinal direction. Fill the tube-shaped packaging material with food. Cut the tubular packaging material by transverse sealing in the transverse direction. Fold along the crease line to form the final shape. The final shape includes a brick shape, an octagonal prism shape, and a regular tetrahedron shape.

FIG. 4 shows an outline of an example of the paper container filling and packaging machine. In the filling machine shown in this example, the packaging material web 1 having a thermoplastic material layer on the inner and outer layers and wound into a roll is unwound and conveyed inside the filling machine by a roller. A spout sealed with a pull tab is formed in the pull tab attaching device 2. The strip tape is joined to one end of the packaging material web by the strip tape applicator 3, the packaging material web is sterilized in a sterilant tank, formed into a tube shape by the forming roller 6, and longitudinally sealed by the longitudinal seal element 8. Seal.
The tube is filled with liquid food from the filling pipe 7 and is held by the sealing jaw 10 and the opposing jaw 11 while being sent downward by a length corresponding to one packaging container, and is transversely sealed in the transverse direction. Thus, two transverse seal zones are formed. The seal zone of the pillow-shaped preform is cut with a knife or the like and separated into individual pillow-shaped preforms 13. The upper and lower flaps of the separated pillow-shaped preform are bent and molded into the final package filling container 14.

In the package filling container 14 shown in FIG. 5, a spout 15 is formed on the upper wall surface of the container, and a pull tab 16 is attached to the spout 15. At the time of drinking, the pull tab 16 is peeled off to open the spout 15.
The container 14 with a pull tab attached to the spout shown in FIG. 5 has a spout 15 formed of a small punch hole on the upper wall surface. As shown in the partial cross-sectional view and the internal view of FIG. 6 showing the spout 15 with the pull tab 16 sealed, the inner tape 17 is sealed from the spout 15 and the pull tab 16 is sealed from the outer. At this time, the inner tape 17 and the pull tab 16 are fused at the spout 15. The inner tape is formed by laminating polyethylene, polyvinylidene chloride and polyethylene. The pull tab is formed of an aluminum film, and one surface is covered with a polyethylene resin layer.
When the pull tab 16 is peeled off when drinking liquid food, the portion of the inner tape 17 fused with the pull tab 16 is broken by the pull tab 16 to open the spout.

In the pull tab sticking device, the web-like packaging laminate material 1 is continuously formed with a spout 15 by punch hole forming means as shown in FIG. 7, and the inner tape is heated by resistance heating, induction heating, etc. Is heat sealed.
The pull tab sticking device is provided with a counter dolly and a pull tab seal heater arranged to be movable up and down with respect to the counter dolly. The pull tab seal heater is moved, and the inner tape, the packaging material, and the pull tab are sandwiched between the counter dolly. In the meantime they are sealed.
Utility registration No. 2582857 Japanese Patent Laid-Open No. 02-152609

However, if the inner tape is not properly sealed at a predetermined position at the spout due to punch hole formation, the contents may leak from the container filled with liquid food or the seal may be poor. Conventionally, for quality control, an operator takes a sample of a container that has been filled and molded by a filling and packaging machine, cuts and opens the container, and inspects the sealing position of the inner tape based on an inspection manual.
In the conventional inspection method, since a part is extracted as a sample instead of a total inspection, there is an inconvenience that when a defective product is generated, all the products in the lot must be inspected.
On the other hand, a method for inspecting the sealing position of the inner tape in-line inside the filling and packaging machine has been proposed by an electrical method, a mechanical method, an optical method based on image recognition, etc., but it is not always satisfactory. There is a problem that it is not possible to produce a correct result.
The object of the present invention is to inspect the total number of container products in-line with respect to the sealing position of the inner tape, detect the position well, and immediately discharge defective products from the line, and quality control the packaging container It is to provide a method that can.

The method for inspecting a web-like packaging material according to the present invention comprises a web-like packaging material for a paper container having a punch tab for a spout and a pull tab and an inner patch film for sealing the punch hole and its peripheral portion from the outside and the inside. A method for inspecting during transportation,
(A) arranging the first gloss sensor and the second gloss sensor in the direction perpendicular to the conveyance of the packaging material;
(B) The first gloss sensor disposed at the position corresponding to the progress of the punch hole detects the relative position of the end of the inner patch film from the end of the punch hole,
(C) By detecting the end in the conveyance perpendicular direction by the second gloss sensor disposed at the position corresponding to the advance of the conveyance perpendicular end of the inner patch film,
(D) From the relative position data of the end portion of the inner patch film, the positional deviation of the inner patch film is primarily evaluated,
(E) Based on the presence detection of the conveyance perpendicular direction edge part of an inner patch film, and primary evaluation, the quality of an inner patch film is evaluated.
It is characterized by that.

In the inspection method for a web-like packaging material of the present invention, a web-like packaging material for a paper container having a pull tab and an inner patch film for forming a spout punch hole and sealing the punch hole and its peripheral portion from the outside and the inside is provided. In-line, ie during transport.
In step (a) of the inspection method of the present invention, the first gloss sensor and the second gloss sensor are arranged in the direction perpendicular to the conveyance of the packaging material. This gloss sensor detects the edge position and heating (seal) range of the inner patch film by utilizing the fact that predetermined incident light is irradiated to the subject and the reflectance of the subject varies depending on conditions.

In step (b) of the inspection method of the present invention, the relative position of the end portion of the inner patch film from the end portion of the punch hole is detected by the first gloss sensor disposed at the position corresponding to the progress of the punch hole. In this invention, it is inspected whether or not the inner patch film is sealed at an appropriate position with respect to the punch hole. In the web-like packaging laminated material for paper containers in which the present invention is used, the inner patch film and punch hole have the same size and shape, so the relative position of the inner patch film end from the punch hole end is measured. To do.

Depending on the material, material, shape, or size of the inner patch film and the punch hole, the relative positions of the inner patch film and the punch hole can be measured more accurately and multilaterally by the plurality of first gloss sensors.
In the step (c) of the inspection method of the present invention, the end portion in the transport perpendicular direction is detected by the second gloss sensor disposed at the position corresponding to the travel of the end portion in the transport perpendicular direction of the inner patch film. The light reflectance of the film surface changes at the end of the inner patch film by heating. Changes in the light reflectance of the surface of the packaging material, the edge of the inner patch film in the direction perpendicular to the conveyance direction, and the surface of the inner patch film in the sealing (heating) range are measured.

In step (d) of the inspection method of the present invention, the positional deviation of the inner patch film is firstly evaluated from the relative position data of the inner patch film end. As a method for measuring the positional deviation, for example, the distance to the inner patch film end with respect to the punch hole end is measured, the relative position is measured, and the positional deviation is evaluated by comparison with a predetermined reference value. To do.
When the relative position data is obtained by the plurality of first gloss sensors, it is possible to evaluate the positional deviation in the translation direction and the positional deviation in the rotation direction of the inner patch film.
In step (e) of the inspection method of the present invention, the quality of the inner patch film is evaluated based on the presence / absence detection of the end portion in the direction perpendicular to the conveyance direction of the inner patch film and the primary evaluation. As described above, in the step (d), it is possible to evaluate the positional deviation in the translation direction and the positional deviation in the rotation direction of the inner patch film. Further, the presence / absence of the end portion in the direction perpendicular to the conveyance direction of the inner patch film in step (c) is confirmed as a probe for primary evaluation in step (d), thereby making the inspection method of the present invention more reliable.

With the inspection method of the present invention, the total number of container products can be inspected inline for the sealing position of the inner tape, the position can be detected well, the defective products can be immediately discharged from the line, and the quality of the packaging container can be controlled can do.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows an example of an inspection apparatus according to an embodiment of the present invention. FIG. 1A is a plan view schematically showing the configuration and arrangement of the apparatus, and FIG. 1B is a cross-sectional view showing a partial cross section of the apparatus.
In this aspect, in the inspection apparatus, two first gloss sensors 21 and 22 and two second gloss sensors 23 and 24 are arranged in a direction perpendicular to the conveyance of the packaging material (arrow).
The first gloss sensors 21 and 22 detect the position of the inner patch film 17 end from the punch hole 15 end, and measure the relative distance of the inner patch film end from the punch hole end.
FIG. 2 shows a schematic diagram of the ON / OFF operation by the first gloss sensor 21 when the gloss of the surface of the packaging material 1 is higher than the gloss of the surface. In this example, the edge (H) from the surface (A) of the packaging material 1 to the inner patch film seal area operates from OFF to ON, and the edge to the inner patch film area (GC) performs an OFF / ON operation. The OFF / ON operation is performed from the inner patch film area to the punch hole end (C-F).
In this aspect, since the relative position data is obtained by the two first gloss sensors 21 and 22, not only the positional deviation in the translation direction of the inner patch film but also the positional deviation (parallelism) in the rotational direction. Can be evaluated.

In the apparatus of this aspect, the analog signal of the gloss sensor is processed by the measurement unit controller 25. The processed signal is calculated by the processing unit 26 for data evaluation and good / bad determination.

In this embodiment, the second gloss sensor 23, 24 detects the end of the inner patch film in the direction perpendicular to the conveyance direction.
At the end of the inner patch film, the light reflectance of the film surface changes by heating. FIG. 3 shows a schematic diagram of ON / OFF operation by the second gloss sensor 23 when the gloss of the surface of the packaging material 1 is higher than the gloss of the surface. In this example, an outline of the OFF / ON operation in the surface (A) of the packaging material, the seal (heating) range (E) at the end of the inner patch film in the direction perpendicular to the conveyance direction, and the inner patch film region (G) is shown.

In this aspect, the processing device 26 for data evaluation and good / bad determination firstly evaluates the positional deviation of the inner patch film from the relative position data of the inner patch film end.
The processing device 26 measures the relative position by measuring the distance to the inner patch film end with the punch hole end as a reference, and evaluates the positional deviation compared with a predetermined reference value.
Further, the processing device 26 evaluates the quality of the inner patch film based on the presence / absence detection of the end portion in the conveyance perpendicular direction of the inner patch film and the primary evaluation. The positional deviation in the translational direction and the parallelism positional deviation of the inner patch film can be evaluated. It can be confirmed as a primary evaluation probe by detecting the presence or absence of the end of the inner patch film in the direction perpendicular to the conveyance direction.

In addition, this invention is not limited to the said embodiment, It can change variously based on the meaning of this invention, and does not exclude them from the scope of the present invention.

The packaging material to be inspected by the inspection method of the present invention can produce packaging containers for beverages such as milk, juice and mineral water, and liquid foods.

Schematic of apparatus showing using inspection method of one embodiment of the present invention Schematic operation of the apparatus shown using the inspection method of one embodiment of the present invention Schematic operation of the apparatus shown using the inspection method of one embodiment of the present invention Schematic diagram of a packaging and filling machine using the inspection method of the present invention Perspective view of a container with a pull tab attached Schematic diagram of the pull tab Schematic of packaging material using the inspection method of the present invention

Explanation of symbols

1 Packaging material 15 Outlet 16 Inner tape

Claims (1)

A method for inspecting a web-like packaging material for a paper container having a pull tab and an inner patch film, in which a punch hole for a spout is formed and sealing the punch hole and its peripheral portion from the outside and the inside, during transportation,
(A) disposing a first gloss sensor and a second gloss sensor in a direction perpendicular to the conveyance direction of the packaging material;
(B) The relative position of the inner patch film end portion from the punch hole end portion is detected by the first gloss sensor arranged at the position corresponding to the progress of the punch hole,
(C) Detecting the conveyance perpendicular direction end by the second gloss sensor disposed at the position corresponding to the conveyance perpendicular end of the inner patch film,
(D) From the relative position data of the end portion of the inner patch film, firstly evaluate the positional deviation of the inner patch film,
(E) Based on the detection of the presence / absence of the conveyance patch perpendicular direction end of the inner patch film and the primary evaluation, the quality of the inner patch film is evaluated,
Inspection method characterized by

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