JP5220392B2 - Bubble sheet body forming information detection apparatus and bubble sheet body forming information detection method - Google Patents

Description

  The present invention detects information related to the molding state of a bubble sheet that is a determination material when determining whether or not a defective portion such as a molding failure of a gel or a cap is included in a bubble sheet that is a resin molded product. The present invention relates to a device for detecting the information and a method for detecting information relating to the molding state of the bubble sheet body.

Conventionally, as a device for detecting gel contained in a thin film, a device provided with a single light source for irradiating a traveling film and an image sensor for detecting transmitted light by irradiation of the light source is mentioned. (See, for example, Patent Document 1). This device irradiates the film with a single light source, the image sensor receives the transmitted light, and can output a monochrome image corresponding to the received light amount to an output screen such as a monitor. The amount of light received by the image sensor when irradiating the part where the gel remaining in a granular form is irradiated is lower than the amount of light received by the image sensor when irradiating a normal part where no gel is generated. A bright and dark contrast appears strongly between the burned portion and the normal portion that is the periphery thereof, and it is detected whether or not gel is generated based on the bright and dark contrast.
Japanese Patent Laid-Open No. 6-242023

  By the way, since the conventional thing does not assume the laminated | stacked bubble sheet | seat body which has many convex caps as a test | inspection object while using the flat thin film-like film as a test | inspection object, A peculiar defect that may occur, that is, a molding defect of the cap, cannot be accurately detected.

  The bubble sheet body is a resin molded product obtained by bonding at least a cap sheet having a large number of convex caps and a flat back sheet bonded to the bottom side of the cap.

  Here, “cap molding failure”, which is a peculiar defect that may occur in the bubble sheet body, is that the cap does not become a clean convex shape during vacuum forming or pressure forming of the cap sheet, or the back sheet Among them, the part that overlaps the bottom of the cap enters the cap, so that the molding state of the bubble part that seals the internal space of the cap is different from the molding state intended by the designer, in short, It means that the molding state of the bubble part is insufficient. It has also been pointed out that such "cap molding defects" are caused by oxidation of the resin due to the resin staying in the gel or the flat die (hereinafter, the oxidation phenomenon is referred to as "burning"). ing.

  As described above, the conventional detection device detects whether or not gel or burn has occurred based on the presence or absence of contrast of light and dark that appears strongly between the portion where the gel or burn has occurred and the normal portion that is the peripheral portion thereof. I am doing so.

  However, since the air bubble sheet has a large number of caps, when the air bubble sheet is irradiated by only a single light source as in the conventional detection device, the flat area where the cap is not formed is used. The shadow is inevitably reflected in the boundary between the cap and the cap, and some of the flexure that can occur at the top of the cap (so-called undulation: this undulation can also occur in normal caps). Causes contrast between light and dark. If the detection result that “gel or burn is occurring” is output with the occurrence of this contrast of light and dark, it does not accurately detect the molding failure of the cap, and is fatal as a detection device. It will have a certain defect.

  As described above, since the conventional detection device uses only a single light source, it is suitable for detection of “gel and burn”, but “cap molding” is a defect point peculiar to the bubble sheet. In addition to being unsuitable for detecting "bad", whether the contrast of light and darkness captured by the image sensor means [1] "Generation of gel or burnt" or [2] Flat with no cap formed It is not possible to clearly distinguish between [1] and [2] whether or not the boundary portion between the region and the cap, or a simple reflection of some of the bending portion that may occur at the top of the cap, When light / dark contrast is detected, it is not permitted to treat all of them as being indicative of the presence of a defective part. After all, when light / dark contrast is detected, the operator Distinguished by eye or [1] or [2], that it shall require the work is not practical.

  Until now, it was determined by the operator's visual observation whether or not the bubble sheet had a defective molding of the cap. However, as the production speed increased, the defective molding of the cap was visually confirmed. The determination of whether or not there is a limit has already reached its limit, and there is a strong demand for the development of an apparatus that can automatically detect the presence or absence of cap molding defects.

  Furthermore, many types of bubble sheet bodies have been developed so as to be compatible with various applications, and the size and density of the caps are different for each type. For this reason, even if an apparatus capable of automatically detecting the presence or absence of a cap molding failure is developed, it is necessary to re-adjust the light amount of the light source and the sensitivity of the image sensor according to the size and density of the cap. If it is a thing, the efficiency of the whole detection operation will be worsened and it will be inferior to practicality.

  Moreover, as a defect that cannot be accurately detected by a conventional detection device, there is a so-called “film break” in which a part of a film is broken in addition to a cap molding defect. When the part where the film is broken is irradiated with a single light source, contrast between light and dark appears between the part where the film is broken and the normal part around it. It cannot be clearly distinguished whether it means “occurrence of occurrence” or film tearing, and it is difficult to detect whether film tearing has occurred.

  Therefore, the inventor of the present application pays attention to such problems, and after extensive research, not only gels and scorching, but also cap molding defects or film tearing that may occur as defects peculiar to bubble sheet bodies have occurred. This is a book that can be used as "information related to the molding state of a bubble sheet body" that is judgment information when determining whether or not the bubble sheet body contains a defective portion. Invented the invention.

That is, the air bubble sheet forming information detecting device of the present invention includes at least a cap sheet formed with a plurality of protruding caps, and a flat back sheet bonded to the bottom side of the cap among the cap sheets. For detecting information related to the molding state of the bubble sheet body, which is determination information when determining whether or not the bubble sheet body includes a defective portion. possess a single first light source for irradiating, and a first image sensor of a single detecting the transmitted light by irradiation of the first light source, depending on the size and arrangement of the cap first image sensor detects The contrast between light and dark in a certain regular part is different from a predetermined value corresponding to a normal part where the molding failure of the cap or the sheet is not broken, or the normal A first detector for detecting that the molding defects or film tear of the cap occurs when a numerical value not included in a predetermined numerical range corresponding to the minute, respectively spaced apart along the running direction of the bubble sheet possess a plurality of the second light source, and a second image sensor of a single detecting the transmitted light by irradiation of a second light source for irradiating light from each of the plurality of points on the inspected portion of the bubble sheet was, first And a second detection unit that detects that gel or burn has occurred when the image sensor detects a contrast between light and dark, and the first detection unit and the second detection unit are connected to the bubble. It arrange | positions in the position mutually spaced apart along the running direction of a sheet | seat body, It is characterized by the above-mentioned.

  In such a case, each of the second light sources of the second detection unit irradiates the inspection target site from a plurality of points separated from each other along the traveling direction of the bubble sheet body, so that a flat cap is not formed. It is possible to eliminate the shadow of the boundary between the region and the cap and the shadow of some of the flexure that may occur on the top of the cap. As a result, when the second image sensor captures the contrast of light and dark, This means that “the occurrence of gels and burns”, and whether or not gels or burns are generated can be detected based on the presence or absence of this contrast. That is, the second detection unit exhibits a function of detecting whether gel or burn is occurring.

  On the other hand, the first detection unit receives the irradiation light from the single first light source by the single first image sensor, so that the light receiving plane of the first image sensor is in accordance with the size and density of the cap. The shadow of the flat area where the cap is not formed and the cap and the some bent portion that may occur at the top of the cap are regularly reflected, and the contrast of light and dark appears regularly. And, if the irradiated part is a normal part where the molding failure of the cap or film tear does not occur, the contrast of light and darkness that appears is within a predetermined value or a predetermined numerical range, while the irradiated part is the molding of the cap If it is a part where a defect or film tear has occurred, the contrast of light and darkness that appears will not be within the predetermined value or the predetermined numerical range. Can be detected. Note that even when a gel or burned portion is irradiated by a single first light source, contrast of light and dark appears in the first image sensor, but the contrast of light and dark depends on the size and density of the cap. Because it appears in places that are different from the regular contrast of light and dark that is reflected in other words, in other words, in irregular places, it is possible to detect the occurrence of gels and burns with the contrast of light and dark that appear in such irregular places It is. However, since the above-described second detection unit exclusively detects the presence or absence of gels or burns, an irregular part that does not correspond to the size or density of the cap in the contrast of light and darkness that appears in the first detection unit The first detector detects only cap molding defects or film breakage by ignoring (through) the contrast of light and darkness that appears in the image and using only regular light and dark contrasts corresponding to the size and density of the cap. Can function as

  As described above, the first detection unit mainly functions as a cap for detecting poor molding and film breakage of the cap, and the second detection unit is mainly operated as a unit for detecting gel and burn. By clarifying the division of roles, it is possible not only to detect gels and burns that were possible with conventional detection devices, but also suitable for molding defects and film breaks that were difficult or impossible with conventional detection devices. Can be detected.

  Furthermore, since the first detection unit and the second detection unit are arranged at positions separated from each other along the traveling direction of the bubble sheet body, the bubble sheet body includes the first detection unit and the first detection unit. 2 By sequentially passing through the detection unit, it is possible to reliably detect a defective portion in which any of gel, burning, defective molding of the cap, and film breakage occurs, and the detected information is stored in the bubble sheet body. It can be utilized as “information relating to the molded state of the bubble sheet” that is the determination information when determining whether or not a defective portion is included.

  In addition, “information regarding the molding state of the bubble sheet” is not only information regarding the molding state of each cap (bubble part), but also the molding state of the cap sheet and the back sheet itself, that is, gel or burning occurs in each sheet. It is a concept including information on whether or not

Further, the air bubble sheet forming information detection method of the present invention includes at least a cap sheet formed by projecting a plurality of protruding caps, and a flat back sheet bonded to the bottom side of the cap among the cap sheets. A method for detecting information related to a molding state of a bubble sheet body, which is determination information when determining whether or not a defective portion is included in the bubble sheet body, and irradiates the inspection target portion of the bubble sheet body The transmitted light of a single first light source is detected by a single first image sensor, and the contrast of light and dark at a certain regular place according to the size and arrangement state of the cap detected by the first image sensor is a cap. The value is different from the predetermined value corresponding to the normal part where no molding defects or sheet tearing occurs, or is included in the predetermined numerical range corresponding to the normal part. The inspection of the first detection step and said bubble sheet from a plurality of points spaced along each of the running direction of the bubble sheet for detecting that the molding defects or film tear of the cap occurs when a have numerical A single second image sensor detects the transmitted light of a plurality of second light sources that respectively irradiate the target site, and detects that gel or burn has occurred when the second image sensor detects contrast between light and dark. And a second detection step.

  If this is the case, substantially the same effect as described above, that is, it is possible to detect mainly cap molding defects and film breakage in the first detection step, and mainly detect gel and burn in the second detection step. It is possible to reliably detect a place where these various defects (gel, burn, cap molding defect, film breakage) have occurred.

  As described above, according to the present invention, not only gel or burning, but also detection of whether there is a molding failure of a cap that may occur as a defect peculiar to a bubble sheet body, or a film breakage is detected. The information can be used as “information on the molding state of the bubble sheet body” which is judgment information when determining whether or not the bubble sheet body includes a defective portion, and also for the bubble sheet body manufactured at high speed It is possible to automatically detect whether or not the defective portion is included in the bubble sheet.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  The bubble sheet S to be inspected by the detection apparatus according to the present embodiment is manufactured by, for example, the bubble sheet manufacturing apparatus X shown in FIG. 1, and a cap sheet CS in which a plurality of protruding caps CSa are formed, and the cap sheet CS. Among them, a flat back sheet BS to be bonded to the bottom side of the cap CSa is provided.

  The bubble sheet body manufacturing apparatus X includes a cap sheet supply apparatus X1 that supplies a cap sheet CS, and a cap sheet CS that is connected to the vacuum suction source X2v and supplied from the cap sheet supply apparatus X1 to a number of protruding caps CSa. A vacuum forming roll X2 to be formed, a back sheet supply device X3 for supplying a back sheet BS, and a back supplied from the back sheet supply device X3 to the back side of the cap sheet CS in which a large number of caps CSa are formed by the vacuum forming roll X2. At least a pressure roll X4 that presses and fuses the sheet BS, and a peeling roll X5 that peels the bubble sheet S formed by fusing the cap sheet CS and the backsheet BS together from the vacuum forming roll X2. It is.

  The cap sheet supply device X1 is composed of, for example, a cap sheet extruder X11 and a cap sheet flat die X12.

  For example, as shown in FIG. 2, the vacuum forming roll X <b> 2 includes a cap forming suction cavity X <b> 21 that is recessed in the outer peripheral surface of the roll body, and a plug X <b> 22 that can be fitted to the bottom wall portion of the suction cavity X <b> 21. A suction horizontal hole X23 formed from one end to the other end of the roll body and opened at both ends, and a suction side hole X23 provided in the bottom wall portion of each suction cavity X21 and corresponding to each suction cavity X21. And a cylindrical vacuum passage X24 communicating with each other, and both ends of the suction side hole X23 can be connected to the vacuum suction source X2v.

  The backsheet supply device X3 includes, for example, a backsheet extruder X31 and a backsheet flat die X32.

  Next, a method and an operation for manufacturing the bubble sheet S using such a bubble sheet manufacturing apparatus X will be described.

  First, a pellet as a raw material of the cap sheet CS is melted in a cap sheet extruder X11 of the cap sheet supply device X1, and the cap pellet flat is formed as a film-like cap sheet film CSF in which the melted pellet is in a thermoplastic state. Extruded from the die X12 and sequentially supplied to the rotating vacuum forming roll X2. The cap sheet CS having a large number of caps CSa corresponding to the shape of the suction cavity X21 is continuously formed by the vacuum suction action of the vacuum forming roll X2 connected to the vacuum exhaust device X2v.

  On the other hand, the pellets as the raw material of the backsheet BS are melted in the backsheet extruder X31 of the backsheet feeder X3, and the backsheet flat is formed as a film-like backsheet film BSF in which the melted pellets are in a thermoplastic state. Extruded from the die X32 and sequentially supplied to the vacuum forming roll X2. Then, the back sheet film BSF that is sequentially supplied to the vacuum forming roll X2 is bonded to the bottom surface side of the cap sheet CS by the pressure roll X4 so that the back sheet film BSF becomes a cap sheet. It functions as a flat back sheet BS to be bonded to the bottom side of the cap CSa of the CS.

  By passing through the above process, as shown in FIG. 3, the two-layered bubble sheet S having a large number of bubble portions SA formed by sealing the internal space of the cap CSa in a sufficient vacuum state is formed. The bubble sheet S that has passed through the pressure roll X4 is then peeled off from the vacuum forming roll X2 by the peeling roll X5, and is finally wound around a winding roll (not shown).

Although the bubble sheet S manufactured in this manner has a fairly low probability, the following defects (1) to (4) where defects occur (hereinafter simply referred to as “defect points”). ) May be included.
(1) Phenol that is a raw material does not completely melt and remains in powder form in the cap sheet CS and the back sheet BS, so-called “gel”
(2) Resin oxidation phenomenon caused by the resin staying inside the cap sheet flat die X12 of the cap sheet supply device X1 and the back sheet flat die X32 of the back sheet supply device X3, so-called "burning"
(3) “Cap molding failure”
(4) A phenomenon in which a part of the cap sheet film CSF (and hence the cap sheet CS) and the back sheet film BSF (and thus the back sheet BS) is broken by the gel or burnt being caught on the lip portions of the flat dies X12 and X32. , So-called "film tear"

  In addition, since “gel (1)” and “burn (2)” remain in the cap sheet CS and the back sheet BS in a granular form, the appearance thereof is substantially the same as shown in FIG. .

  Further, “cap molding failure (3)” means that, as shown in FIG. 5, when the cap sheet CS is vacuum-formed, the cap CSa is crushed without a clean convex shape (see FIG. 5A). Alternatively, the part of the back sheet BS that overlaps the bottom part of the cap CSa enters the cap CSa (see FIG. 5B), so that the molding state of the bubble part SA is different from the molding state intended by the designer. In short, it means that the bubble part SA is not sufficiently molded.

  Further, the “film tear (4)” looks as shown in FIG.

  4 to 6 schematically show various defects (1) to (4) for convenience of explanation.

  It is extremely difficult to accurately determine whether or not such a defective portion is included in the bubble sheet S with the naked eye of the operator on the production line.

  Therefore, in the present embodiment, the “bubble” which is the determination information when determining whether or not the various defective portions are included in the bubble sheet S using the bubble sheet forming information detection device Y shown in FIG. Information on the forming state of the sheet body ”is detected.

  The bubble sheet forming information detection device Y includes a first detection unit Y1 and a second detection unit Y2.

  The first detection unit Y1 includes a single first projector Y11 (corresponding to the “first light source” of the present invention) that irradiates light to the bubble sheet S traveling in a predetermined direction (the direction of arrow A shown in FIG. 7). The first projector Y11 and the bubble sheet S are arranged at positions facing each other in the thickness direction, and a single first image sensor Y12 that detects transmitted light by irradiation of the first projector Y11 is provided.

  The first projector Y11 illuminates the bubble sheet S from a direction substantially orthogonal to the surface direction of the bubble sheet S. In the present embodiment, a fluorescent lamp that emits relatively weak light is applied as the first projector Y11.

  The first image sensor Y12 has a sensing function with relatively low sensitivity.

  On the other hand, the second detection unit Y2 includes a pair of second projectors Y21 that irradiate the bubble sheet S from two different points spaced from each other along the traveling direction of the bubble sheet S (the "second light source" of the present invention). And a single second image sensor Y22 that detects transmitted light by irradiation of the pair of second projectors Y21.

  Each of the second projectors Y21 illuminates the bubble sheet S from a direction inclined by a predetermined angle with respect to the surface direction of the bubble sheet S. In the present embodiment, a fluorescent lamp that emits light relatively stronger than the first projector Y11 is applied as the second projector Y21.

  The second image sensor Y22 has a sensing function that is relatively more sensitive than the first image sensor Y22.

  In the air bubble sheet forming information detection apparatus Y of the present embodiment, the first detection unit Y1 is disposed on the upstream side and the second detection unit Y2 is disposed on the downstream side along the traveling direction of the bubble sheet S. ing.

  Next, the procedure and operation for detecting information related to the molding state of the bubble sheet S using such a bubble sheet forming information detection device Y will be described.

  The bubble sheet S conveyed along the running direction by a feed roller (not shown) sequentially passes through the first detection unit Y1 and the second detection unit Y2.

  When the bubble sheet S passes through the first detection unit Y1, the first projector Y11 irradiates a predetermined area of the bubble sheet S, and the first image sensor Y12 couples the transmitted light to its own light receiving plane. The light and darkness of the image is photoelectrically converted into an amount of electric charge, which is sequentially read out and converted into an electric signal, and a monochrome image corresponding to the amount of received light is output to an output screen (monitor) (not shown). Since the object to be irradiated is the air bubble sheet S having irregularities, the shadow of the boundary portion between the flat area where the cap CSa is not formed and the cap CSa, and the shadow of some bending portion that may occur on the top of the cap CSa The first image sensor Y12 captures the light and darkness (brightness / darkness contrast) at every certain pitch according to the size and arrangement state (density) of the cap CSa. Then, if the portion irradiated by the first projector Y11 is a normal portion in which a cap molding defect (3) or film tear (4) has not occurred, the contrast of light and dark captured by the first image sensor Y12 is calculated in advance. It is within a predetermined value or a predetermined numerical range derived from the above.

  On the other hand, when the 1st light projector Y11 irradiates the location where the shaping | molding defect (3) of the said cap and the film tear (4) have arisen, for every fixed pitch according to the magnitude | size and arrangement | positioning state (density) of the cap CSa. In addition, the shading (brightness / darkness contrast) captured by the first image sensor Y12 is different from a predetermined value calculated and derived in advance, or a numerical value not included in a predetermined numerical range calculated and derived. Will be shown. This is because the amount of light received by the first image sensor Y12 irregularly increases or decreases due to poor molding of the cap (3) or film tear (4), and the contrast balance and lightness appearing in the first image sensor Y12 are This is a result obtained by the difference in contrast balance and brightness detected when a normal part where the molding defect (3) or film tear (4) of the cap is not generated is irradiated.

  Based on such a principle, the first detection unit Y1 has a contrast of light and dark in the bubble sheet S, in which the first image sensor Y12 indicates a value different from the predetermined value or a value not included in the predetermined numerical value range. For the captured part, as the “information relating to the molding state of the bubble sheet body”, the bubble sheet body molding information indicating that the cap molding defect (3) and the film tear (4) have occurred is detected.

  In addition, when the 1st light projector Y11 irradiates the part which the gel (1) and the burn (2) have produced among the bubble sheet bodies S, the gel (1) and the burn (2) are granular to the said part. Since it is mixed in the cap sheet CS and the back sheet BS, the amount of light received by the first image sensor Y12 is reduced, and the gel (1) and burn (2) are generated and the surrounding area is normal. The contrast of light and dark appears in the part. However, the air bubble sheet forming information detection device Y according to the present embodiment detects whether or not the gel (1) or the burn (2) is generated by the second detection unit Y2 described in detail below. Therefore, in the first detection unit Y1, the contrast of light and darkness that appears in a place different from a certain regular place according to the size and arrangement state (density) of the cap CSa, in other words, an irregular place. , “Information regarding the molding state of the bubble sheet” is not treated as an influence, but is ignored.

  The bubble sheet S that has passed through the first detection unit Y1 continues to pass through the second detection unit Y2. When passing through the second detection unit Y2, the pair of second projectors Y21 simultaneously irradiate light to a predetermined area of the bubble sheet S from two different points, and each of the transmitted light is shared by the common second image sensor Y22. An image is formed on the light receiving plane, and the light and darkness of the image is photoelectrically converted into an amount of electric charge, which is read out sequentially and converted into an electrical signal, and a monochrome image corresponding to the amount of received light is output (monitor) not shown Is output. A pair of second projectors Y21 simultaneously irradiate light to a predetermined region of the bubble sheet S from two different points, thereby reflecting shadows due to the unevenness of the cap CSa, that is, a flat region where the cap CSa is not formed. The shadow of the shadow reflecting the boundary portion between the cap CSa and a slight bending portion that may occur at the top of the cap CSa can be eliminated, and the second image sensor Y22 makes the bubble sheet S flat with no unevenness. A monochromatic image corresponding to a case where a flat sheet without unevenness is captured by being imaged on its own light receiving plane as being equivalent to a sheet is output to the output screen.

  And when each 2nd light projector Y21 irradiates the part which the gel (1) and the burn (2) have produced among the bubble sheet bodies S, the gel (1) and the burn (2) become granular and cap Since the sheet CS and the back sheet BS are mixed, the amount of light received by the second image sensor Y22 is reduced, and the portion where the gel (1) and the burn (2) are generated and the normal portion which is the peripheral portion thereof. The contrast of light and dark appears strongly.

  Based on such a principle, the second detection unit Y2 uses the gel as “information on the molding state of the bubble sheet” for the portion of the bubble sheet S where the second image sensor Y22 captures the contrast of light and dark. The bubble sheet body forming information indicating that (1) and burn (2) have occurred is detected.

  Then, the contrast of light and dark captured by the first image sensor Y12 of the first detection unit Y1 is within a predetermined value or a predetermined numerical range, and the second image sensor Y22 of the second detection unit Y2 is bright or dark. When the contrast is not captured, the bubble sheet forming information detection device Y indicates that none of the various defects (1) to (4) has occurred as “information relating to the forming state of the bubble sheet”. The bubble sheet body forming information is detected.

  As described above, the “information regarding the molding state of the bubble sheet” obtained through the first detection step using the first detection unit Y1 and the second detection step using the second detection unit Y2 is as follows. Subsequently, it is sent from the first detection unit Y1 and the second detection unit Y2 to a discrimination device (not shown), and the discrimination device determines whether the molding state of the bubble sheet S is based on “information on the molding state of the bubble sheet body”. By determining whether or not the reference value set in advance is satisfied, it is finally determined whether the bubble sheet S is a normal product or a defective product (defective product) including a defective portion that is equal to or higher than the reference value. To determine. That is, in this embodiment, the bubble sheet forming information detection device Y and the discrimination device detect whether or not the bubble sheet body includes a defective portion, and based on the detected information, the defective product ( A “bubble sheet defect inspection apparatus” is finally configured to determine whether or not to be a defective product.

  The air bubble sheet forming information detecting device Y according to the present embodiment may constitute a part of the air bubble sheet manufacturing apparatus X, or may constitute a part of the air bubble sheet manufacturing apparatus X. However, the detection may be performed by re-expanding the bubble sheet S once wound on the winding roll of the bubble sheet manufacturing apparatus X.

  As described above, the bubble sheet body molding information detection device Y according to the present embodiment receives the irradiation light from the single first projector Y11 by the single first image sensor Y12, so that the molding failure of the cap (3 ) And film tear (4) can be detected. On the other hand, the gel (1) and the burn (2) are received by receiving the irradiation light of each second projector Y21 from two points separated from each other along the traveling direction of the bubble sheet S by the single second image sensor Y22. It is possible to detect whether or not an error has occurred.

  In this way, the first detection unit Y1 functions mainly to detect cap molding defects (3) and film breaks (4), and the second detection unit Y2 mainly functions as gel (1) and burn (2 ) To detect the gel (1) and burnt (2), and the cap molding defect (3) or Film tear (4) can also be accurately detected.

  Furthermore, since the 1st detection part Y1 and the 2nd detection part Y2 are distribute | arranged mutually along the traveling direction of the bubble sheet S, the bubble sheet S is the 1st detection part Y1. And the second detection unit Y2 in order to reliably detect a defective portion in which any of gel (1), burn (2), cap molding failure (3), and film breakage (4) occurs. The detected information can be used as “information relating to the molding state of the bubble sheet body” which is determination information when determining whether or not the bubble sheet body S includes a defective portion. .

  In addition, by using the air bubble sheet forming information detection device Y having a feedback function, even when each of various air bubble sheet bodies S having different cap CSa sizes and densities is inspected, the feedback function Accordingly, the light quantity of each light source (first projector Y11, second projector Y21) and each image sensor (first image sensor Y12, second image sensor Y22) according to the size and density of the cap CSa of each bubble sheet S. Sensitivity can be automatically adjusted, and the operator does not need to re-adjust the settings of each light source and each image sensor every time the type of bubble sheet S is different, improving the efficiency of the entire detection operation. It will be excellent in practicality. As a specific aspect of the feedback function, the bubble sheet forming information detection device Y uses each piece of bubble sheet as information on the size and density of each cap CSa of the plurality of types of bubble sheet S that has been inspected. A cap information storage unit (database) that stores information associated with the identification information of the body S, and the operator inputs the identification information of the bubble sheet S to be inspected, or the bubble sheet forming information detection device Y itself is the bubble sheet. Cap information corresponding to the identification information of the bubble sheet S is read (extracted) from the cap information storage unit by automatically detecting the identification information of the body S by an automatic detection means that can automatically detect the body S, and the reading is performed. Based on the cap information, the light amount of each light source (first projector Y11, second projector Y21) and each image sensor. (First image sensor Y12, the second image sensor Y22) aspect in which the sensitivity of the respectively automatic adjustment thereof.

  The present invention is not limited to the embodiment described in detail above.

  For example, the second detection unit may include three or more second light sources. Similarly, the second detection step uses a single second image sensor to transmit transmitted light of a plurality of second light sources that respectively irradiate the bubble sheet body from three or more points that are spaced apart from each other along the traveling direction of the bubble sheet body. It may be a step of detecting by.

  Further, the light amount of each light source and the sensitivity of each image sensor may be appropriately changed.

  The second detection unit may be disposed on the upstream side and the first detection unit may be disposed on the downstream side along the traveling direction of the bubble sheet body. Similarly, the first detection step may be performed after the second detection step.

  In order to ensure higher detection accuracy, even if a device including a plurality of detection units (first detection unit, second detection unit) or any one of the detection units is applied as the bubble sheet body forming information detection device I do not care. Similarly, it may be a bubble sheet forming information detection method that passes through both detection steps (first detection step, second detection step) or any one of the steps.

  The bubble sheet body may have a three-layer structure in which a flat liner sheet is bonded to the top side of the cap, or may have four or more layers. The cap may be formed by pressure forming.

  In addition, the specific configuration of each part is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

The figure which shows typically the bubble sheet body manufacturing apparatus in one Embodiment of this invention. The figure which fractures | ruptures partially and shows typically the vacuum forming roll of the bubble sheet manufacturing apparatus. The figure which shows typically the bubble sheet body manufactured by the bubble sheet body manufacturing apparatus. The figure which shows typically the bubble sheet | seat body in which gel or burning is contained. The figure which shows typically the bubble sheet | seat body in which the shaping | molding defect of a cap is contained. The figure which shows typically the bubble sheet | seat body in which a film tear is contained. The figure which shows typically the bubble sheet body shaping | molding information detection apparatus which concerns on the same embodiment.

Explanation of symbols

S ... Bubble sheet body BS ... Back sheet CS ... Cap sheet CSa ... Cap Y ... Bubble sheet body molding information detection device Y1 ... First detection unit Y11 ... First light source (first projector)
Y12 ... 1st image sensor Y2 ... 2nd detection part Y21 ... 2nd light source (2nd light projector)
Y22 ... Second image sensor

Claims (2)

Whether or not a defective portion is included in a bubble sheet body comprising at least a cap sheet formed with a plurality of protruding caps and a flat back sheet bonded to the bottom side of the cap among the cap sheets Is a bubble sheet forming information detecting device for detecting information related to the forming state of the bubble sheet serving as determination information when determining
Single first light source for irradiating light to the inspected portion of the bubble sheet, and have a first image sensor of a single detecting the transmitted light by irradiation of the first light source, the first image sensor detects Depending on the size and arrangement of the caps, the contrast of light and dark at a certain regular location is different from a predetermined value corresponding to a normal portion where the molding failure of the cap or the tearing of the sheet does not occur, or the normal portion. A first detection unit that detects that a cap molding failure or film breakage occurs when the numerical value is not included in the corresponding predetermined numerical range ;
A plurality of second light sources that respectively irradiate light to the inspection target portion of the bubble sheet body from a plurality of points that are separated from each other along the traveling direction of the bubble sheet body, and transmitted light by irradiation of these second light sources is detected. have a single second image sensor, it comprises a second detector for detecting that the gel or burn occurs when the second image sensor detects the contrast of light and dark,
The bubble sheet body forming information detection device, wherein the first detection section and the second detection section are arranged at positions separated from each other along a traveling direction of the bubble sheet body. Whether or not a defective portion is included in a bubble sheet body comprising at least a cap sheet formed with a plurality of protruding caps and a flat back sheet bonded to the bottom side of the cap among the cap sheets It is a bubble sheet forming information detection method for detecting information related to the forming state of the bubble sheet that is the determination information when determining
The transmitted light of the single first light source that irradiates the inspection target portion of the bubble sheet is detected by a single first image sensor, and is constant according to the size and arrangement state of the cap detected by the first image sensor. The contrast between light and dark at regular locations is a value different from a predetermined value corresponding to a normal portion where the molding failure of the cap or tearing of the sheet has not occurred, or a numerical value not included in the predetermined numerical range corresponding to the normal portion. A first detection step for detecting that there is a cap molding failure or film breakage in some cases ;
A plurality of second light sources that irradiate each of the inspection target portions of the bubble sheet body from a plurality of points spaced apart from each other along the traveling direction of the bubble sheet body are detected by a single second image sensor ; A second detection step for detecting the occurrence of gel or burning when the image sensor detects contrast of light and dark ;
1. A method for detecting information on forming a bubble sheet body, comprising:

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