JP4239028B2 - Seal inspection method and apparatus - Google Patents

Description

  The present invention relates to a seal inspection method and apparatus.

  Conventionally, many packaged products in which contents such as foods and medicines are stored in packaging bags have been manufactured. Such a packaged product is usually manufactured by filling the packaging bag with a certain amount of the contents, and sealing the opening of the packaging bag by heat sealing. Biting due to contents may occur. When biting by the contents occurs in the seal portion, the contents gradually absorb moisture or oxidize, which is not preferable from the viewpoint of maintaining quality. Therefore, a heat seal inspection method as disclosed in Patent Document 1 is known as a method for detecting the biting of the contents into the seal portion and discriminating a seal abnormality.

  The heat seal inspection method disclosed in Patent Document 1 will be described with reference to FIG. FIG. 9 shows that after both ends of the sheet-shaped packaging film F are heat-sealed by the center seal mechanism 100 to form the cylindrical package T having the center seal portion SS, a part of the cylindrical package T is end-sealed. It is a schematic block diagram which shows the line which heat seals by the mechanism 101, forms the end seal part ES, is filled with the content, and manufactures a bagging product. In the heat seal inspection method disclosed in Patent Document 1, as shown in FIG. 9, the end seal portion ES formed by heat fusion is sandwiched between a pair of pressing members 102 and 102, and the distance between the two is set to two. When both or one of the measured distances is measured by the eddy current sensors 103 and 103 and exceeds a preset reference threshold value, biting of the contents occurs in the end seal portion ES. It is determined that it was done.

The cross-sectional shape of the end seal portion ES is such that the center seal portion SS formed by heat-sealing both ends of the packaging film with the center seal mechanism 100 of FIG. Usually, the seal portion ES is formed at a substantially central portion. For example, due to the occurrence of film meandering, as shown in FIG. 11, the center seal portion SS is one end portion of the end seal portion ES. In some cases, it may be biased to the side.
JP 2003-112714 A

  However, in the above-described heat seal inspection method, the abnormal product in which minute contents are caught in the end seal portion and the center seal portion are formed to be biased toward one end side of the end seal portion. It is difficult to accurately discriminate between normal products, and what should be judged as an abnormal product is judged as a normal product, or what should be judged as a normal product is judged as an abnormal product. There was a problem.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a seal inspection method and apparatus capable of accurately inspecting a seal abnormality of a seal portion in a packaged product.

The above object of the present invention is to provide a seal inspection method for inspecting a biting contents into the end seal portion of the bag packed product having a center seal portion and the end seal portion, the center when sandwiching the end seal portion a pressing step for pressing across the end seal portion in a pair of pressing members having a pressing surface that is opposed inclined to each other by the effect of the sealing portion, wherein when sandwiching the end seal portion in the pair of pressing members A measurement step of measuring the distance between the pressing surfaces at a plurality of locations and adding the measured plurality of distances between the surfaces, or multiplying the measured plurality of distances between the surfaces. and the seal status value calculation step of calculating a value obtained as a seal status value of the end seal portion by, said sealing status values, the plurality of bags packed product And a determination step of determining whether the biting contents are compared with a threshold that is determined based on the standard deviation for the seal status value calculated, the threshold value K, a plurality The standard deviation value calculated for the packaged product of σ is σ, the first threshold when σ is σ1 is k1, and the second threshold when σ is σ2 is k2. When
K = k1 (where σ ≦ σ1)
K = (k2−k1) σ / (σ2−σ1) +
(K1 · σ2−k2 · σ1) / (σ2−σ1)
(However, σ1 <σ <σ2)
K = k2 (where σ ≧ σ2)
This is achieved by a seal inspection method in which the threshold value is determined by an expression represented by:

  Moreover, it is preferable that the said measurement step measures the distance between the said pressing surfaces in the both sides of the said seal part, respectively.

  Moreover, it is preferable to further include an adhesion determination step for determining whether or not the adhesion of the seal portion is good based on a standard deviation of the seal status value.

The above-described object of the present invention, there is provided a seal inspection apparatus for inspecting a biting contents into the end seal portion of the bag packed product having a center seal portion and the end seal portion, when sandwiching the end seal portion A pair of pressing members having pressing surfaces that are disposed to be opposed to each other under the influence of the center seal portion, and a value of a distance between the pressing surfaces when the end seal portion is sandwiched between the pair of pressing members. A value obtained by adding a plurality of measurement means and a plurality of measured inter-surface distance values or by multiplying a plurality of measured inter-surface distance values is measured by the end seal portion. and the seal status value calculating means for calculating as a seal status value, and the sealing status values, based on the standard deviation for the seal status value calculated for a plurality of bags packed product By comparing the threshold value which is determined had a determining means for determining whether the biting contents, for the sealing situation values calculated with the threshold value K, for a plurality of bags packed product When the standard deviation value of σ is σ, the first threshold value when σ is σ1 is k1, and the second threshold value when σ is σ2 is k2,
K = k1 (where σ ≦ σ1)
K = (k2−k1) σ / (σ2−σ1) +
(K1 · σ2−k2 · σ1) / (σ2−σ1)
(However, σ1 <σ <σ2)
K = k2 (where σ ≧ σ2)
It said threshold is achieved by the seal inspection apparatus is determined in the represented equation.

  ADVANTAGE OF THE INVENTION According to this invention, the seal | sticker test | inspection method and apparatus which can test | inspect accurately the seal | sticker abnormality of the seal | sticker part in a bagging product can be provided.

  Hereinafter, a seal inspection apparatus according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a schematic configuration diagram of a seal inspection apparatus according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line AA of FIG. As shown in FIGS. 1 and 2, the seal inspection apparatus 1 includes a casing 2 and an inspection apparatus body 3.

  The casing 2 includes a base 21, a support column 22, and an attachment portion 23 disposed above the base 21. The base 21 and the attachment portion 23 are connected to each other via the support column 22.

  The inspection apparatus body 3 includes a pressing unit 31, two sensor units 32 and 33, and a management device 34. The pressing unit 31 includes a pair of pressing members 311 and 312 and a support member 313. The pair of pressing members 311 and 312 includes an upper pressing member 311 and a lower pressing member 312 having pressing surfaces 311a and 312a facing each other, and presses the seal portion ES of the package H between the upper and lower sides. The support member 313 is attached to the attachment portion 23 of the casing 2 so as to be movable in the vertical direction via a driving device (not shown). An upper pressing member 311 is attached to the lower end portion of the support member 313, and the upper pressing member 311 is also configured to move in the vertical direction as the support member 313 moves up and down. The lower pressing member 312 is fixed to the base 21.

  Each sensor part 32 and 33 is a measuring means for measuring the distance between the pressing surfaces of the upper pressing member 311 and the lower pressing member 312. As shown in FIG. 2, these sensor units 32 and 33 are arranged so that the distance between the pressing surfaces on both sides of the seal unit ES can be measured. The sensor units 32 and 33 are fixed to the attachment unit 23 of the casing 2 so that an electrical signal corresponding to the distance from the sensor heads 32a and 33a to the upper surface of the upper pressing member 311 can be output to the management device 34. It is configured. An eddy current sensor, a laser displacement meter, or the like can be used as the sensor units 32 and 33. A method of measuring the inter-surface distance between the pressing surfaces of the upper pressing member 311 and the lower pressing member 312 will be described later.

  The management device 34 includes a memory unit 341, an input unit 342, a display unit 343, an inter-surface distance calculation unit 344, a seal status value calculation unit 345, and a determination unit 346. The memory unit 341 is a storage unit that stores output values of electric signals output from the sensor units 32 and 33, preset threshold values, and the like. The input unit 342 is an input unit for inputting an operation command or a stop command for the seal inspection device 1 or for inputting a changed threshold value when the threshold value stored in the memory unit 341 is changed. is there. The display unit 343 is a display unit for displaying that when the contents are caught in the seal unit ES.

  The inter-surface distance calculation unit 344 is an arithmetic unit that calculates the inter-surface distance between the pressing surfaces of the upper pressing member 311 and the lower pressing member 312 based on the electrical signals output from the sensor units 32 and 33. In order to calculate the inter-surface distance, first, as shown in FIG. 3A, a driving device (not shown) is moved to lower the upper pressing member 311 of the pressing portion 31, whereby the seal portion ES and the lower pressing member 312 are moved. Sandwiched between. While maintaining this state, the distances L1 and L2 from the sensor heads 32a and 33a of the two sensor units 32 and 33 to the upper surface of the upper pressing member 311 are measured. As shown in FIG. 3B, the distances from the sensor heads 32a and 33a to the upper surface of the upper pressing member 311 when the seal portion ES does not exist between the upper pressing member 311 and the lower pressing member 312 are respectively L01 and L02. Then, (L01-L1) corresponds to the inter-surface distance D1 between the pressing surfaces of the upper pressing member 311 and the lower pressing member 312 measured by the sensor unit 32, and (L02-L2) is calculated by the sensor unit 33. This corresponds to the measured inter-surface distance D2.

  The seal status value calculation unit 345 is a calculation unit that calculates a seal status value that is a parameter indicating the seal status of the seal portion ES using the plurality of inter-surface distances calculated by the inter-surface distance calculation unit 344. . In the present embodiment, the seal state value is calculated by adding a plurality of inter-surface distances between the measured pressing surfaces. Instead of adding a plurality of inter-surface distances and calculating the seal status value, for example, the seal status values may be calculated by multiplying the distances between the surfaces.

  The determination unit 346 compares the seal state value calculated by the seal state value calculation unit 345 with the threshold value stored in the memory unit 341 to determine whether or not the contents of the seal unit ES are bitten. Means.

  The seal inspection apparatus 1 configured as described above is used in, for example, a content packaging apparatus 5 as shown in the schematic configuration diagram of FIG. In addition to the seal inspection device 1, the content packaging device 5 includes a support base 51, a bobbin mounting member 52, a film delivery mechanism 53, a content supply mechanism 54, a center seal mechanism 55, an end seal mechanism 56, a cutting mechanism 57, A package conveyor 58 is provided.

  The support base 51 is a member that supports the bobbin mounting member 52, the film delivery mechanism 53, the center seal mechanism 55, the end seal mechanism 56, the seal inspection device 1, the cutting mechanism 57, and the package conveyor 58.

  The bobbin attachment member 52 is a member for attaching the bobbin 521 around which the sheet-like packaging film F is wound. Examples of the packaging film F include films in which polyethylene or polypropylene is laminated on both surfaces of an aluminum foil.

  The film delivery mechanism 53 is a device for delivering the packaging film F from the bobbin 521, and includes a drive motor (not shown), a roller 531a, and a delivery unit 531 having an endless belt 531b wound around the roller 531a and contacting the outer surface of the packaging film F. The film transporting conveyor 532 is mounted with the packaging film F sent out by the sending unit 531 and transported in the longitudinal direction of the packaging film F. The film delivery mechanism 53 is configured so that the packaging film F can be intermittently delivered in the longitudinal direction at a predetermined length.

  The content supply mechanism 54 is a device that supplies the content Z onto the fed sheet-like packaging film F, and guides the transport conveyor 541 that conveys the content Z and the content to a predetermined location on the packaging film. A guide member (not shown) is provided.

  The center seal mechanism 55 is a device that forms a cylindrical package T having a center seal portion SS by overlapping and heat-sealing both ends of the packaging film F supplied with the contents Z in a palm-like shape.

  The end seal mechanism 56 is an apparatus that forms an end seal portion ES by heat-sealing the cylindrical package T perpendicularly to the longitudinal direction thereof, and includes an upper heating member 561 that is slidable in the vertical direction, and a lower heating. Member 562. The upper heating member 561 and the lower heating member 562 are arranged to face each other with the cylindrical packaging body T interposed therebetween, and the upper heating member 561 descends to place a predetermined position of the cylindrical packaging body T in the lower heating member 562. The package H in which the end seal portion ES is formed is generated by pressing and heating between the two.

  The cutting mechanism 57 is an apparatus for cutting the package H on which the end seal portion ES is formed by the end seal portion ES to individually distribute the package H, and includes a slide cutter 571 slidable in the vertical direction and a fixed cutter. 572. The slide cutter 571 and the fixed cutter 572 are arranged to face each other with the package H interposed therebetween.

  The package conveyor 58 is a conveying device for supplying individual packages H (packed products) cut by the cutting mechanism 57 to a subsequent process such as a boxing operation.

  The seal inspection apparatus 1 is disposed between the end seal mechanism 56 and the cutting mechanism 57 in order to detect the presence or absence of the contents in the end seal portion ES.

  The content packaging apparatus 5 supplies the content Z onto the packaging film F from the content supply mechanism 54 while intermittently feeding the packaging film F by the film delivery mechanism 53, and the center seal portion SS by the center seal mechanism 55. Forming the end seal portion ES by the end seal mechanism 56, inspecting the biting of the contents in the end seal portion ES by the seal inspection device 1, and cutting the package H by the cutting mechanism 57, A packaged product H filled with the contents Z is produced. When the seal inspection apparatus 1 detects the biting into the end seal portion ES, the package conveyor 58 distinguishes the normal product from the normal product and collects it. Also, the delivery of the packaging film F by the film delivery mechanism 53, the supply of the contents Z onto the packaging film F, the formation of the center seal portion SS, the formation of the end seal portion ES, the content biting inspection, the end seal portion ES The timing of cutting or the like is preferably performed by computer control in accordance with, for example, a program input in advance.

  Next, the operation of the seal inspection apparatus 1 will be described. First, as shown in FIG. 3A, the driving device (not shown) is moved to lower the upper pressing member 311 of the pressing portion 31, whereby the end seal portion ES formed by the end seal mechanism 56 is moved to the lower pressing member 312. Sandwiched between. Maintaining this state, the distances L1 and L2 from the sensor heads 32a, 33a of the two sensor portions 32, 33 to the upper surface of the upper pressing member 311 and the upper pressing member 311 as shown in FIG. Based on the distances L01 and L02 from the sensor heads 32a and 33a to the upper surface of the upper pressing member 311 when there is no end seal portion ES between the lower pressing member 312 and the upper pressing member 311 and the lower pressing member 312. The inter-surface distance calculation unit 344 calculates the inter-surface distances D1, D2 between the pressing surfaces.

  Next, the seal status value calculation unit 345 calculates the seal status value by adding the inter-surface distances D1 and D2 between the pressing surfaces of the upper pressing member 311 and the lower pressing member 312, and the determination unit 346 sets in advance If the seal status value is smaller than the threshold value, the product is judged to be normal.If the seal status value is greater than the threshold value, the content bite has occurred. Judge that it is a product.

  By adding the distances D1 and D2 between the two surfaces measured by the sensor units 32 and 33, the distance between the pressing surfaces of the upper pressing member 311 and the lower pressing member 312 generated by the biting of the contents into the end seal portion ES. Since the change in the inter-surface distance can be emphasized, even if a minute content biting occurs, it can be accurately detected.

  More specifically, a description will be given using FIGS. 5 to 7 in comparison with a conventional inspection method. FIG. 5A shows that a normal end seal portion ES in which the contents are not bitten is sandwiched between the upper pressing member 311 and the lower pressing member 312, and the distance between the pressing surfaces is determined by the sensor portions 32 and 33. It is a schematic structure sectional drawing showing the state currently measured by. Similarly, FIG. 5B shows that the end seal portion ES where the minute contents Z are caught is sandwiched between the upper pressing member 311 and the lower pressing member 312, and the distance between the pressing surfaces is measured by each sensor. FIG. 5C is a schematic cross-sectional view showing a state measured by the portions 32 and 33, and FIG. 5C shows a normal product in which the center seal portion SS is formed biased toward one end side of the end seal portion ES. FIG. 4 is a schematic cross-sectional view showing a state in which an end seal portion ES is sandwiched between an upper pressing member 311 and a lower pressing member 312 and a distance between the pressing surfaces is measured by each sensor portion 32 and 33. FIG. 6A shows a qualitative relationship diagram of the inter-surface distance between the pressing surfaces of the upper pressing member 311 and the lower pressing member 312 which are measured in the normal product shown in FIG. Due to the influence of the center seal portion SS, the distances between the surfaces measured by the sensor portions 32 and 33 generally do not match as shown in FIG. 6 (b) is a qualitative relationship diagram of the inter-surface distance between the pressing surfaces measured in the abnormal product shown in FIG. 5 (b), and FIG. 6 (c) is the center shown in FIG. 5 (c). The qualitative relationship figure of the inter-surface distance between the press surfaces measured in the normal goods in which the seal | sticker part SS was formed unevenly is shown. FIG. 7A shows seal status values calculated by adding the distances between the pressing surfaces measured by the sensor units 32 and 33 shown in FIG. 6A. b) or (c) also shows the seal status value calculated by adding the distances between the surfaces measured by the sensor units 32 and 33 shown in FIG. 6B or 6C.

  As shown in FIG. 5 (b), when the biting of the contents Z occurs in the end seal portion ES, the upper pressing member 311 is displaced upward as compared with the normal product shown in FIG. 5 (a). The influence of this displacement appears in the measurement values of the sensor units 32 and 33, and the distance between the pressing surfaces measured by the sensor units 32 and 33 is as shown in FIG. The values are larger than those of normal products shown in FIG.

  Further, as shown in FIG. 5C, in a normal product in which the center seal portion SS is formed in a biased manner, the sensor portion 33 disposed on the side where the center seal portion SS exists due to the influence of the center seal portion SS. As shown in FIG. 6 (c), the distance between the pressing surfaces measured by the step is larger than the distance between the normal surfaces shown in FIG. 6 (a), but the center seal portion SS exists. The distance between the pressing surfaces measured by the sensor unit 32 disposed on the non-moving side is smaller than the distance between the surfaces in the normal product shown in FIG. This is because the center seal portion SS is formed in a biased manner, and the inclination of the upper pressing member 311 that sandwiches and presses the end seal portion ES with the lower pressing member 312 as shown in FIG. 5C. However, this is considered to be caused by the fact that it is larger than the case of pressing the normal product shown in FIG.

  Here, as in the prior art, when determining the presence or absence of biting of contents based on a preset threshold value for each inter-surface distance measured by the sensor units 32 and 33, for example, When the value indicated by the broken line in FIGS. 6A to 6C is adopted as the threshold value, each sensor unit in the abnormal product in which the minute content Z bites shown in FIG. Since the distance between the pressing surfaces measured by 32 and 33 is smaller than the threshold value, it is not determined that the content biting has occurred, and it is erroneously determined to be a normal product. . On the other hand, in the normal product in which the center seal portion SS shown in FIG. 6C is formed in a biased manner, the distance between the pressing surfaces measured by the sensor portion 33 exceeds the threshold value. It will be judged as an abnormal product.

  On the other hand, according to the method of detecting the biting of the contents based on the seal state value obtained by adding the distances between the pressing surfaces measured by the sensor units 32 and 33, FIG. As shown in FIG. 7 (c), the seal status value in the abnormal product in which the content biting has occurred is larger than the seal status value in the normal product in which the center seal portion SS is biased. Therefore, if the threshold value is set to a value as shown by the broken line in FIGS. 7A to 7C, the abnormal product in which the contents are caught is accurately determined as the abnormal product. In addition, it is possible to accurately determine that a normal product in which the center seal portion SS is biased is a normal product.

  As described above, according to the seal inspection apparatus 1 according to the present embodiment, the distance between the pressing surfaces of the upper pressing member 311 and the lower pressing member 312 is measured at two locations by the two sensor units 32 and 33. Is used to calculate a seal state value that emphasizes the change in the inter-surface distance between the pressing surfaces of the upper pressing member 311 and the lower pressing member 312 that is generated by the biting of the contents Z into the seal portion. Since the seal status value is compared with the threshold value, it is possible to accurately detect the biting of the minute content Z, and the abnormal product in which the biting of the minute content Z has occurred, and the center seal portion SS end. It is possible to accurately discriminate a normal product that is biased toward one end of the seal portion ES.

  In the present embodiment, the distance between the pressing surfaces on both sides of the end seal portion ES is measured, and the seal state value is calculated using these measured values. Changes in the inter-surface distance between the pressing surfaces of the upper pressing member 311 and the lower pressing member 312 in the abnormal product in which the contents are caught in the part ES and the normal product in which the center seal part SS is formed in an uneven manner Can be made to appear prominently in the seal status value, so that the detection of minute contents biting, the abnormal product in which biting of the minute contents Z has occurred, and the center seal part SS are connected to the end seal part ES. It is possible to more accurately distinguish a normal product that is biased toward one end.

  As mentioned above, although one Embodiment of this invention was described, the specific aspect of this invention is not limited to the said embodiment. For example, it is possible to detect the biting of the contents in the center seal portion SS of the packaged product using the seal inspection apparatus 1 according to the present embodiment.

  Moreover, in this embodiment, the structure which further provides the heating part for heat sealing in the pressing surfaces 311a and 312a of the upper pressing member 311 and the lower pressing member 312 of the press part 31 can also be employ | adopted. By adopting such a configuration, the upper pressing member 311 and the lower pressing member 311 are heat-sealed by sandwiching the tubular package T between the upper pressing member 311 and the lower pressing member 312, and at the same time, the upper pressing member 311 and the lower pressing member The inter-surface distance between the pressing surfaces with 312 can be measured by the sensor units 32 and 33. As a result, when the seal inspection apparatus 1 having such a configuration is used in the content packaging apparatus 5 as shown in FIG. 4, the content packaging apparatus 5 can be reduced in size and the packaged product Can be efficiently manufactured. Further, it is possible to adopt a configuration further including a cutting mechanism for cutting the end seal portion ES.

  Moreover, in this embodiment, the two sensor parts 32 and 33 are provided, the distance between the pressing surfaces of the upper pressing member 311 and the lower pressing member 312 is measured at two places, and the distance between these surfaces is added. The seal state value is compared with a preset threshold value to detect the presence or absence of the biting of the contents in the end seal part ES. Measure the distance between the faces, and compare the seal status value with the distance between the faces and the threshold value set corresponding to this seal status value, so that the bite of the contents can be detected. It may be configured.

  Moreover, in this embodiment, you may comprise so that the threshold value compared with a seal condition value may be determined based on the standard deviation about the seal condition value calculated with respect to several bagging products. For example, the threshold value can be calculated by a regression equation combining a constant and a linear equation as shown in FIG. In FIG. 8, when the standard deviation value of the seal state value is σ1 or less, the threshold value is K1, and when the standard deviation value is σ2 or more, the threshold value is K2, and the standard deviation value is σ1. In the range from to σ2, the threshold value is set as a linear expression connecting K1 and K2. Note that the regression equation between the standard deviation value of the seal state value and the threshold value is not limited to the relational expression shown in FIG. 8, and can be appropriately set by a combination of a constant, a primary expression, a quadratic expression, or the like.

  With such a configuration, for example, a normal product in which the center seal portion SS is formed at a substantially central portion of the end seal portion ES due to the occurrence of film meandering, and the center seal portion SS is one end portion of the end seal portion ES. Even when normal products that are biased to the side are mixed and the variation in the seal status value becomes large, the contents of the end seal part ES are used by using the optimum threshold value corresponding to this variation. The biting inspection can be performed, and the content biting inspection of the seal portion can be efficiently performed without the threshold setting work by the operator.

  Moreover, you may make it judge the quality of the adhesiveness of the end seal part ES based on the standard deviation of a seal condition value. When the standard deviation value of the seal state value exceeds a value that is assumed in advance, it can be determined that the seal state of the end seal portion ES has deteriorated. By monitoring the deviation value, it is possible to objectively determine whether or not the seal adhesion at the end seal portion ES is good, and it is possible to predict the timing of maintenance of the end seal mechanism 56. Instead of monitoring the standard deviation value of the seal status value, for example, a configuration may be adopted in which the red lamp blinks when the calculated standard deviation value exceeds a certain value.

Moreover, in this embodiment, although the sensor parts 32 and 33 employ | adopt the structure fixed to the attaching part 23 of the casing 2, it is not specifically limited to such a structure, For example, FIG. As shown to a), the structure attached to the side part of the lower press member 312 can also be employ | adopted. When such a configuration is employed, plate-like members 35 and 36 disposed to face the sensor heads 32 a and 33 a are attached to the side surface portion of the upper pressing member 311. In order to calculate the inter-surface distance between the pressing surfaces, first, in a state where the end seal portion ES is sandwiched between the upper pressing member 311 and the lower pressing member 312, from each sensor head 32a, 33a to the plate-like members 35, 36. Measure the distance. Then, from this measured value, the distance from the sensor heads 32a, 33a to the plate-like members 35, 36 when the upper pressing member 311 and the lower pressing member 312 are pressed without passing through the end seal portion ES is performed. be able to.

It is a schematic structure figure of a seal inspection device concerning one embodiment of the present invention. It is AA sectional drawing of the seal | sticker inspection apparatus shown in FIG. It is explanatory drawing explaining the method to measure the distance between surfaces by a seal test | inspection apparatus shown in FIG. It is a schematic block diagram which shows an example of the content packaging apparatus in which the seal inspection apparatus shown in FIG. 1 is used. (A) to (c) are respectively a normal product, an abnormal product in which the contents are bitten, and an end seal part of a normal product in which the center seal part is formed with a bias between an upper pressing member and a lower pressing member. It is a schematic structure sectional view showing the state where it is inserted and the distance between the pressing surfaces is measured by each sensor part. (A) to (c) are normal products shown in FIG. 5 (a), abnormal products shown in FIG. 5 (b), and normal products in which the center seal portion shown in FIG. It is a figure which shows the qualitative relationship of the inter-surface distance between the press surfaces measured by each sensor part. (A)-(c) is a figure which respectively shows the seal | sticker condition value calculated by adding the inter-surface distance between the press surfaces measured by each sensor part in each case of FIG. 6 (a)-(c). is there. It is explanatory drawing for demonstrating an example of the regression type used when calculating a threshold value based on the standard deviation of a seal | sticker condition value. It is explanatory drawing for demonstrating the test | inspection method which test | inspects the conventional seal | sticker part abnormality. It is sectional drawing which shows the cross-sectional shape of the end seal part of a bagging product. It is sectional drawing which shows the cross-sectional shape of the end seal part of the bagging product in which the center seal part was formed unevenly. It is a schematic structure sectional drawing which shows the modification of the seal | sticker test | inspection apparatus shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seal test | inspection apparatus 3 Inspection apparatus main body 31 Press part 311 Upper press member 312 Lower press member 311a, 312a Press surface 32, 33 Sensor part 34 Management apparatus 344 Inter-surface distance calculation part 345 Seal condition value calculation part 346 Determination part ES End seal SS Center seal

Claims (4)

A seal inspection method for inspecting a biting contents into the end seal portion of the bag packed product having a center seal portion and the end seal portion,
A pressing step of pressing the end seal portion with a pair of pressing members having pressing surfaces that are inclined and opposed to each other due to the influence of the center seal portion when the end seal portion is sandwiched;
A measurement step of measuring the value of the inter-surface distance between the pressing surfaces when the end seal portion is sandwiched between the pair of pressing members at a plurality of locations;
A sealing situation in which a value obtained by adding the measured values of the inter-surface distances or by multiplying the measured values of the inter-surface distances as the sealing status value of the end seal portion A value calculation step;
A determination step of comparing the seal status value with a threshold value determined based on a standard deviation for the seal status value calculated for a plurality of bagged products to determine whether or not the contents are bitten. And
The threshold value is K, the standard deviation value for the seal status value calculated for a plurality of bagging products is σ, the first threshold value when σ is σ1 is k1, and σ is σ2 When the second threshold value is k2,
K = k1 (where σ ≦ σ1)
K = (k2−k1) σ / (σ2−σ1) +
(K1 · σ2−k2 · σ1) / (σ2−σ1)
(However, σ1 <σ <σ2)
K = k2 (where σ ≧ σ2)
A seal inspection method in which the threshold value is determined by an expression represented by:   The seal inspection method according to claim 1, wherein the measuring step measures an inter-surface distance between the pressing surfaces on both sides of the seal portion.   The seal inspection method according to claim 1, further comprising an adhesion determination step of determining whether or not the seal part has good adhesion based on a standard deviation of the seal status value. A seal inspection apparatus for inspecting a biting contents into the end seal portion of the bag packed product having a center seal portion and the end seal portion,
A pair of pressing members having pressing surfaces that are opposed to each other by the influence of the center seal portion when the end seal portion is sandwiched therebetween ;
A plurality of measuring means for measuring a value of a distance between the pressing surfaces when the end seal portion is sandwiched between the pair of pressing members;
A sealing situation in which a value obtained by adding the measured values of the inter-surface distances or by multiplying the measured values of the inter-surface distances as the sealing status value of the end seal portion A value calculating means;
Determining means for comparing the seal status value with a threshold value determined based on a standard deviation for the seal status value calculated for a plurality of packaged products to determine whether or not the contents are bitten. And
The threshold value is K, the standard deviation value for the seal status value calculated for a plurality of bagging products is σ, the first threshold value when σ is σ1 is k1, and σ is σ2 When the second threshold value is k2,
K = k1 (where σ ≦ σ1)
K = (k2−k1) σ / (σ2−σ1) +
(K1 · σ2−k2 · σ1) / (σ2−σ1)
(However, σ1 <σ <σ2)
K = k2 (where σ ≧ σ2)
A seal inspection apparatus in which the threshold value is determined by an expression represented by:

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