WO2024053671A1

WO2024053671A1 - Resin molded article inspection method and inspection device

Info

Publication number: WO2024053671A1
Application number: PCT/JP2023/032525
Authority: WO
Inventors: 博康田渕
Original assignee: オムロンキリンテクノシステム株式会社
Priority date: 2022-09-08
Filing date: 2023-09-06
Publication date: 2024-03-14

Abstract

In the present invention, an inspection area of a bottle 2, which is a resin molded article, is irradiated with excitation rays, such as ultraviolet rays. Detection target light, such as a fluorescent light, of a wavelength region different from the wavelength region of the excitation rays is released from the bottle 2. An image is captured of the inspection area of the bottle 2 irradiated with the excitation rays, such that the wavelength region to be imaged includes the wavelength region of the detection target light, while the wavelength region to be imaged excludes the wavelength region of the excitation light. A state, such as the presence/absence of a molding defect or pass/fail of a marking part, pertaining to the shape and/or structure of the resin molded article in the inspection area, is inspected on the basis of the intensity of the detection target light in the captured image.

Description

Inspection method and device for resin molded products

The present invention relates to a method of inspecting a resin molded product by utilizing the phenomenon that light having different wavelength ranges is emitted when the resin molded product is irradiated with excitation light in a specific wavelength range.

There is a known method for inspecting the suitability of an inspection target by utilizing the phenomenon that when a resin molded product is irradiated with excitation light in a specific wavelength range, light in a wavelength range different from that of the excitation light is emitted from the resin molded product. There is. For example, by illuminating a bottle made of PET resin (polyethylene terephthalate resin) with ultraviolet light and causing the bottle to emit fluorescence, it is possible to create a connection between the bottle and the inspection object, such as a label wrapped around the bottle or a printed part on the bottle. A method has been proposed in which a difference in brightness is generated in the object, and the quality of the object to be inspected is determined using the difference in brightness as a clue (for example, see Patent Documents 1 and 2).

Japanese Patent Application Publication No. 2008-281477 JP2022-37644A

A resin bottle is formed by blow molding a generally hollow cylindrical preform. In blow molding, molding defects are caused by uneven wall thickness, which is caused by local insufficient stretching of the resin and uneven wall thickness due to errors in the shape of the preform, control errors in temperature and other various parameters that affect molding quality, etc. It may occur as a type of. Alternatively, if the stretching progresses excessively, the molecular chains become oriented and densification progresses, which may result in molding defects such as whitening. Molding defects are not limited to blow molding. Even in the case of injection molding, for example, burrs may occur along the mating surfaces of the molds or along the resin inlet, or molding defects may occur due to inadequate temperature control of the molds. Yellowing defects occur at the mouth due to the quality of the raw materials for the preform and inadequate molding conditions such as heating during the preform molding stage.The mouth is not stretched during blow molding, so Yellowing at the mouth of the bottle may remain as a molding defect. Conventionally, inspection for molding defects in resin molded products has been left to visual inspection by operators, but improvements are required in terms of inspection efficiency and inspection quality. In particular, in order to promote labor saving and automation of resin molding, there is a demand for the development of technology that can efficiently and accurately inspect molding defects. The above-mentioned conventional inspection method uses the bottle to emit fluorescence to function as a light source, thereby determining the presence or absence of defects in the inspection target such as the label attached to the bottle. It is not intended to inspect molding defects.

In addition, molding defects in resin molded products can occur when the shape, such as wall thickness, changes from the original shape, or when the structure of the resin molded product, for example, the crystal structure, changes from the original structure, such as whitening or yellowing. It occurs as a cause. If it is possible to find a method to inspect resin molded products based on changes in the shape or structure of the resin molded product, inspection methods using that method can be used to detect not only molding defects but also various conditions of resin molded products. It can be used for testing, and is convenient for expanding the scope of application of testing methods, etc.

Therefore, in one aspect of the present invention, it is possible to inspect the state of at least one of the shape and structure of a resin molded product by utilizing the phenomenon in which detection target light is emitted in response to irradiation with excitation light. The purpose of this research is to provide a method for inspecting resin molded products. Further, a further aspect of the present invention is to provide an inspection method for a resin molded product that can efficiently and highly accurately inspect the presence or absence of molding defects, or to inspect a marking part applied to a resin molded product. Another purpose of the present invention is to provide an inspection method etc. that can be inspected efficiently and with high precision.

A method for inspecting a resin molded product according to one aspect of the present invention is an inspection method for inspecting a resin molded product, in which light in a wavelength range different from the wavelength range of the irradiated light is used as detection target light to detect the resin molded product. A step of illuminating an inspection range of the resin molded product with excitation light that can be emitted from the product, and a step of illuminating the inspection range of the resin molded product illuminated with the excitation light, in which the wavelength range of the detection target light is Based on the procedure of imaging such that the wavelength range of the excitation light is excluded from the wavelength range of the imaging target while being included in the wavelength range of the imaging target, and the intensity of the detection target light in the captured image. , a procedure for inspecting the state of at least one of the shape and structure of the resin molded product in the inspection range.

An inspection device for a resin molded product according to one aspect of the present invention is an inspection device for inspecting a resin molded product, and uses light in a wavelength range different from the wavelength range of the irradiated light as detection target light to detect the resin molded product. an illumination means for illuminating an inspection range of the resin molded product with excitation light that can be emitted from the product; is included in the wavelength range of the imaging target, while the wavelength range of the excitation light is excluded from the wavelength range of the imaging target, and the intensity of the detection target light in the captured image is and an inspection means for inspecting the state of at least one of the shape and structure of the resin molded product in the inspection range based on the inspection range.

1 is a diagram showing an example of an inspection device used in an inspection method according to an embodiment of the present invention. FIG. 3 is a diagram showing the results of measuring a three-dimensional fluorescence spectrum when a sample piece made of polyethylene terephthalate resin was irradiated with ultraviolet light. The figure which shows an example of the relationship between the spectral intensity of the ultraviolet light which illuminates a bottle, the spectral intensity of fluorescence emission of a bottle, and the spectral sensitivity of a filter. The figure which shows an example of the spectral sensitivity of a camera. FIG. 3 is a diagram illustrating an example of molding defects to be inspected by the inspection method according to one embodiment. FIG. 7 is a diagram illustrating another example of molding defects to be inspected by the inspection method according to one embodiment. FIG. 7 is a diagram illustrating further examples of molding defects to be inspected by the inspection method according to one embodiment. An image showing an example of fluorescence emission at the shoulder of a normal bottle with no molding defects. An image showing an example of fluorescent light emission in a bottle with uneven thickness in the shoulder area. An image showing an example of fluorescence emission at the bottom of a normal bottle with no molding defects. An image showing an example of fluorescence emission in a bottle with a misaligned bottom molding defect. An image showing an example of fluorescence emission in a bottle with whitening and uneven thickness forming defects on the bottom. An image showing an example of fluorescence emission at the corner of a normal bottle with no molding defects. An image showing an example of fluorescence emission from a bottle with whitening at the corners. An image showing an example of fluorescence emission in the body of a normal bottle with no molding defects. An image showing an example of fluorescence emission in a bottle with slight whitening on the body. An image showing an example of fluorescence emission from a bottle with clear whitening on the body. An image showing an example of fluorescence emission at the mouth of a normal bottle with no molding defects. An image showing an example of fluorescence emission in a bottle with yellowing at the mouth. The figure which shows the example of the medical syringe where the molding defect occurred in the vicinity of an injection port. An example of an image of the defective molding portion shown in FIG. 11A captured in the wavelength range of ultraviolet light. An example of an image of the defective molding portion shown in FIG. 11A captured in the fluorescence wavelength range. The figure which shows the example of the medical syringe in which the flange part produced the molding defect. An example of an enlarged image of the defective molding location shown in FIG. 12A. An example of an image of the defective molding portion shown in FIG. 12A captured in the wavelength range of ultraviolet light. An example of an image of the defective molding portion shown in FIG. 12A captured in the fluorescence wavelength range. An example of an image of a marking part formed by laser marking and its surroundings in the fluorescence wavelength range. An example of an image obtained by illuminating the same bottle as in FIG. 13 with visible light in the wavelength range and capturing the image in the same wavelength range as the illumination light. An example of an image taken in the fluorescence wavelength range of a marking part formed by a method of adding irregularities to the neck and its surroundings.

Hereinafter, one embodiment of the present invention will be described with reference to the accompanying drawings. In the inspection method of this embodiment, when a resin molded product is irradiated with excitation light in a specific wavelength range, light in a wavelength range different from that of the excitation light is emitted as detection target light, and the intensity of the detection target light is The resin molded product is inspected using the property that the intensity of the detection target light changes depending on the shape and structure of the resin molded product. The shape here may include various items that characterize the external shape of the resin molded product, such as wall thickness and unevenness. The structure may include various items that characterize the material properties of the resin molded product, such as crystal structure and organizational structure. The conditions to be inspected may include various conditions associated with shapes and structures. Hereinafter, one form of the inspection method will be described using a molding defect of a resin molded product as an example. Molding defects in resin molded products are caused by changes in the shape, such as wall thickness, from the original shape, or changes in the crystal structure or organizational structure of the resin molded product, such as whitening or yellowing. It happens. On the other hand, there is a difference between the intensity of the detection target light emitted when a resin molded product is irradiated with excitation light and the shape and structure of the resin molded product. A relationship arises in which the intensity of light also increases. Utilizing this property, it is possible to inspect the presence or absence of molding defects.

FIG. 1 shows an example of an inspection device used in an inspection method according to one embodiment of the present invention. The inspection apparatus shown in FIG. 1 uses ultraviolet light in a specific wavelength range as an example of excitation light, and uses fluorescence generated in response to the ultraviolet light irradiation as an example of detection target light to inspect for molding defects. The resin molded product to be inspected is the bottle 2, for example. The inspection device 1 includes an image acquisition unit 10 that acquires an image based on fluorescence of the bottle 2, and a processing unit 20 that processes the acquired image and inspects the presence or absence of molding defects. The bottle 2 is formed, for example, by blow-molding a generally hollow cylindrical preform made of PET resin in a predetermined mold (molding mold). The body 2a of the bottle 2 has a generally cylindrical shape, and the shoulder 2c between the neck 2b and the body 2a has a generally truncated conical shape. The bottom portion 2d has a shape in which the center portion is recessed inward along the axis AX. Examples of molding defects will be described later.

The image acquisition unit 10 includes an illumination device 11 as an example of an illumination means for illuminating the bottle 2, and an imaging device 12 as an example of an imaging means for taking an image of the bottle 2. The illumination device 11 illuminates the inspection range of the bottle 2 with predetermined illumination light. The inspection range may be the entire bottle 2 or a part of the bottle 2. The illumination device 11 irradiates the bottle 2 with ultraviolet light in a wavelength range that can cause the bottle 2 to emit fluorescence as illumination light. Specific examples of the wavelength range of ultraviolet light will be described later. In the example of FIG. 1, the range from the body 2a to the shoulder 2c of the bottle 2 is set as the inspection range. The lighting device 11 includes, for example, an upper illuminator 11a that illuminates the inspection range from diagonally above, and a lower illuminator 11b that illuminates the same inspection range of the bottle 2 from diagonally below. However, the inspection range of the bottle 2 may be changed as appropriate as described above, and the configuration and illumination direction of the illumination device 11 may also be changed as appropriate according to the inspection range of the bottle 2. For example, when inspecting the neck 2b and shoulder 2c of the bottle 2, the illumination device 11 and the imaging device 12 may be placed in accordance with their positions. When inspecting the bottom part 2d, the camera 13 of the imaging device 12 is arranged below the bottle 2 so that its imaging optical axis Lp coincides with the axis AX, and the illumination device 11 is also arranged to illuminate the bottom part 2d from an oblique direction. may be placed in

The imaging device 12 includes a camera 13 and a filter 14 that limits the wavelength range of light incident on the camera 13 to a range suitable for inspection. The camera 13 converts an optical image of the bottle 2 into an electrical image signal using, for example, an image sensor such as a CCD or a CMOS. The camera 13 images the inspection range of the bottle 2 emitting fluorescent light. The imaging direction is set, for example, so that the bottle 2 is imaged from the same side as the illumination direction by the lighting device 11. In the example of FIG. 1, the imaging optical axis Lp of the camera 13 is oriented in the horizontal direction, and the

illuminators

11a and 11b are arranged so that the optical axes La and Lb of the

illuminators

11a and 11b extend symmetrically across the imaging optical axis Lp. and a camera 13 are arranged. Note that the imaging direction does not necessarily need to be set on the same side as the illumination direction by ultraviolet light, as long as an image that clearly reflects the intensity distribution of fluorescence generated in the bottle 2 can be taken. For example, depending on the inspection range of the bottle 2, the relationship between the illumination direction and the imaging direction is different from that shown in FIG. may be set to .

The imaging range of the camera 13 may be set so that at least an image of the inspection range of the bottle 2 can be captured. Note that during the inspection, the bottle 2 may be stationary or may be moving. For example, the moving bottle 2 may be sequentially imaged by installing the camera 13 on a beverage filling line and causing the camera 13 to perform an imaging operation at the timing when the bottle 2 reaches the imaging range of the camera 13. If only a part of the inspection range can be imaged with one imaging operation using one camera 13, such as capturing an image of the entire circumference of the bottle 2 as an inspection range, the bottle 2 may be rotated and the entire circumference of the bottle 2 may be imaged. An image of the entire inspection range may be captured by controlling the imaging operation of the camera 13 so that the image is captured in multiple times. The bottle 2 may be fixed, and the illumination device 11 and the imaging device 12 may be moved around the bottle 2 to capture an image of the entire inspection range. Alternatively, a plurality of cameras 13 may be provided to take images of the bottle 2 from different directions, and the inspection range of the bottle 2 may be shared in the circumferential direction by these cameras 13 to take images. The lighting device 11 may be lit all the time, or may be controlled to be lit in synchronization with the imaging operation of the camera 13. Note that the inspection range does not necessarily need to be set around the entire circumference of the bottle 2. Further, the inspection range does not necessarily need to be set as a surface having a certain extent. For example, a plurality of spot-like detection positions may be set on the bottle 2, a set of these detection positions may be set as an inspection range, and an image of each detection position may be imaged by the camera 13 as an image of the inspection range. In order to capture such an image, for example, from the image captured by the image sensor of the camera 13, a pixel group corresponding to the detection position may be outputted from the camera 13 as an image signal readout target, or Alternatively, an image signal corresponding to the imaging range of the image sensor may be output, and an image signal corresponding to the detection position may be extracted from the image signal to obtain an image of the detection range. When a set of a plurality of spot-shaped detection positions is used as an inspection range, the accuracy of inspection can be improved by increasing the number of detection positions. In any case, the imaging range of the camera 13 may be set to include the inspection range, and the inspection range may be set to at least a part of the imaging range of the camera 13.

Regarding the wavelength range to be imaged by the camera 13, the filter 14 is arranged such that the wavelength range of fluorescence generated in the bottle 2 is included in the wavelength range of the imaged object, while the wavelength range of ultraviolet light illuminating the bottle 2 is included in the wavelength range of the imaged object. The wavelength range of the incident light to the camera 13 is adjusted so that it is excluded from the wavelength range. However, the spectral characteristics of the filter 14 do not necessarily need to be set to completely block the incidence of the ultraviolet light wavelength range into the camera 13. The wavelength range of ultraviolet light is such that the image captured by the camera 13 shows a brightness distribution reflecting the distribution of fluorescence intensity, and the influence of the wavelength range of ultraviolet light on the brightness distribution is substantially eliminated from the image. It is only necessary that the filter 14 restricts the passage of the light. In other words, the spectral characteristics of the filter 14 are such that the wavelength range of the ultraviolet light that illuminates the bottle 2 is limited compared to the wavelength range of the fluorescence generated in the bottle 2 with respect to the wavelength range of the light incident on the camera 13. It is sufficient if it is set. To that extent, the filter 14 is not limited to completely blocking the incidence of ultraviolet light in the wavelength range, but may be one that relatively reduces the amount of incident light in the ultraviolet wavelength range compared to that in the fluorescence wavelength range. There may be.

On the other hand, regarding the wavelength range of fluorescence, it is sufficient that the amount of fluorescence necessary for inspection is incident on the camera 13. The spectral characteristics of the filter 14 may be set so that the entire wavelength range of the fluorescence passes through the filter 14 and enters the camera 13, or the filter 14 restricts the incidence of part of the wavelength range of the fluorescence into the camera 13. may be done. For example, in the wavelength range of fluorescence, for a part of the wavelength range on the short wavelength side that is relatively close to the wavelength range of ultraviolet light as illumination light, the filter 14 restricts its passage, and the restricted wavelength range The spectral characteristics of the filter 14 may be set so that fluorescence with wavelengths longer than that of the filter 14 passes through the filter 14 and enters the camera 13.

The reason why the filter 14 is used to limit the wavelength range of the imaging target is as follows. The light directed from the bottle 2 toward the camera 13 includes not only fluorescence generated in the bottle 2 but also ultraviolet light reflected by the bottle 2. When ultraviolet light enters the camera 13, the resulting image is affected by the ultraviolet light, which may impede inspection for molding defects based on the fluorescence intensity distribution. On the other hand, the wavelength range of fluorescence generated in PET resin does not match the wavelength range of the irradiated ultraviolet light, and a difference occurs between the two wavelength ranges. Therefore, if the spectral characteristics of the filter 14 are set so that the wavelength range of fluorescence is included in the wavelength range of the object to be imaged by the camera 13, while the wavelength range of ultraviolet light is excluded from the wavelength range of the object to be imaged, It is possible to capture an image that accurately reflects the intensity distribution of fluorescence by suppressing the influence of reflected light. Note that it is not necessarily necessary to use the filter 14 as a separate component from the camera 13 as a means for selecting the wavelength range of the imaging target. For example, if the camera 13 has a function that allows selection of the wavelength range in which the image sensor of the camera 13 exhibits sensitivity, the wavelength range of the imaging target may be adjusted using that function. Note that the wavelength range of the excitation light and the wavelength range of the fluorescence to be detected may be such that the reflected light from the bottle 2 contains higher-order light components such as secondary light with a wavelength twice that of the excitation light. If light in a wavelength range different from any of the above is included as a disturbance component and the disturbance component affects the brightness difference in the image, the filter 14 spectroscopy is adjusted so that the disturbance component is also removed from the wavelength range of the imaging target. The characteristics and the sensitivity of the camera 13 may be set.

Note that the illumination light of the bottle 2 in the environment where the image acquisition unit 10 is installed is mainly the illumination light from the illumination device 11, and the image reflecting the intensity distribution of fluorescence generated in the bottle 2 is captured by the camera 13. Ambient light in the visible range, such as natural light, may be included as long as the image is captured in the image. That is, the bottle 2 may be illuminated only by the illumination light from the illumination device 11 while blocking the environmental light, or some environmental light may be used as long as it does not substantially affect the image reflecting the intensity distribution of fluorescence. may be incident on bottle 2. Alternatively, the filter 14 or the like may be used to remove from the image captured by the camera 13 the influence of light in the visible range that is unnecessary for capturing an image reflecting the fluorescence intensity.

Next, a specific study regarding selection of the wavelength range of ultraviolet light of the lighting device 11 will be explained with reference to FIGS. 2 to 4. FIG. 2 shows the results of measuring a three-dimensional fluorescence spectrum when a sample piece of PET resin was irradiated with ultraviolet light. The vertical axis is the wavelength of the irradiated ultraviolet light, and the horizontal axis is the wavelength of fluorescence. The density of the contour lines in the figure indicates the fluorescence intensity, and the denser the contour lines, the higher the fluorescence intensity. According to FIG. 2, when PET resin is irradiated with ultraviolet light around 365 nm, relatively high intensity fluorescence is generated in the wavelength range of 380 to 430 nm.

FIG. 3 shows the relationship between the spectral intensity of the ultraviolet light that illuminates the bottle 2, the spectral intensity of the fluorescence emission from the bottle 2, and the spectral sensitivity of the filter 14. In FIG. 3, the horizontal axis represents the wavelength, and the vertical axis represents the spectral intensity of ultraviolet light and fluorescence and the spectral sensitivity of the filter 14, respectively. As understood from FIG. 3, when a PET resin is illuminated with ultraviolet light whose spectral intensity peaks around 365 nm, fluorescence occurs in the wavelength range of 380 nm to 430 nm. Although the spectral intensity distribution of ultraviolet light and the spectral intensity distribution of fluorescence partially overlap, if the wavelength range of ultraviolet light is in the range of 360 nm to 380 nm, the spectral characteristics of the filter 14 can be changed from approximately 400 nm to long wavelengths. If the setting is made to allow the light from the bottle 2 to pass through and to restrict the passage of the shorter wavelength range, the fluorescence generated in the bottle 2 can be efficiently transmitted to the camera 13 while suppressing the incidence of ultraviolet light to the camera 13. It can be input to

According to FIG. 2, it is possible to obtain more fluorescence by setting the wavelength range of the ultraviolet light so that the peak is around 320 nm. However, in that case, the wavelength range of fluorescence also shifts to the shorter wavelength side. As shown in FIG. 4, the spectral sensitivity of a general camera used for the purpose of capturing images in the visible light range is highest near 550 nm. The sensitivity of the camera is substantially lost at around 1000 nm on the long wavelength side and around 400 nm on the short wavelength side. Therefore, if the wavelength range of ultraviolet light is set to around 320 nm, the wavelength range of fluorescence may deviate from the wavelength range in which the camera 13 exhibits sufficient spectral sensitivity. Therefore, it is preferable that the ultraviolet light emitted from the lighting device 11 be set in the range of 360 nm to 380 nm as described above.

Next, with reference to FIGS. 5A to 5C, an example of molding defects to be detected by the inspection method of this embodiment will be described. Blow molding of the bottle 2 involves heating the preform to the glass transition temperature to soften it into a rubber-like state, and then stretching the preform in the direction of the axis AX of the bottle 2 (Fig. 1) using a stretching rod. This is carried out by introducing gas pressure into the preform, thereby stretching the preform in two axial directions (vertical and horizontal), and cooling and solidifying it. If there is a shape error in the preform, or various operations and controls during the molding process, such as temperature control related to resin heating such as heater output (heating amount) to heat the preform, stretching operation with a stretching rod, mold If there is a deficiency in the temperature control, etc. of each part of the preform, the preform may not be stretched uniformly, and molding defects may occur. For example, if stretching is insufficient locally, uneven thickness defects may occur where the thickness becomes non-uniform. 5A shows an example in which an uneven thickness portion D1 occurs at the shoulder portion of the bottle 2, and FIG. 5B shows an example in which an uneven thickness portion D2 occurs in the bottom portion of the bottle 2. Alternatively, as shown in FIG. 5C, a misaligned portion D3 may occur at the bottom as a result of uneven stretching. In the misaligned portion D3, a core portion with a relatively large wall thickness should be formed centering on the axis AX of the bottom of the bottle 2, but due to the uneven stretching, the wall thickness deviates from the center of the bottom portion. This occurs due to the distribution of Therefore, the misaligned portion D3 can also be regarded as a type of defective thickness unevenness like the uneven thickness portions D1 and D2. In addition, uneven thickness defects may occur at other locations such as the body.

On the other hand, at locations where stretching has progressed excessively, the molecular chains of the resin are oriented, densification occurs, and crystallization progresses. As a result, deterioration of the structure accompanied by a change in color tone in the visible light range, such as whitening or yellowing, may occur as a molding defect. Although yellowing occurs during the preform molding stage, it remains after blow molding and is a type of bottle molding defect. Hereinafter, this type of molding defect may be referred to as a structure defect. For example, as shown in FIG. 5C, a whitened portion D4 may occur at or near a corner that forms a boundary between the bottom and body of the bottle 2. In addition, although not shown in the drawings, as a result of the mouth of the bottle 2 being deformed so as to be bent compared to its normal state, the wall thickness around the deformed portion may increase, resulting in uneven thickness defects. Alternatively, tissue defects such as whitening or yellowing may occur in part or the entire mouth or bottom of the bottle 2.

At locations where such uneven thickness defects or tissue defects occur, the intensity of fluorescence generated in response to ultraviolet light irradiation differs from the range of fluorescence intensity that would occur in the absence of these defects. For example, in the case of an uneven thickness defect, the fluorescence intensity is higher than that in the normal case at a location where the wall thickness is increased compared to the normal one. In the case of tissue failure, the resin density becomes higher than normal, and the fluorescence intensity becomes higher than normal. If such a change in fluorescence intensity is used as a clue, it is possible to determine whether molding defects such as uneven thickness or texture defects have occurred. Examples of images actually taken of the bottle 2 using the inspection device 1 of FIG. 1 are shown in FIGS. 6A to 10B. In any image, the higher the fluorescence intensity, the higher the brightness in the image.

6A and 6B are examples of images of the vicinity of the boundary between the neck and shoulder of the bottle. FIG. 6A is an image of a normal bottle with no molding defects, and FIG. 6B is an image of a normal bottle with uneven thickness in region X1. This is an image of a bottle. From a comparison of these images, it can be confirmed that the fluorescence intensity in areas where the wall thickness has increased due to uneven thickness defects is higher than in the normal case. 7A to 7C are examples of images taken of the bottom of a bottle. FIG. 7A is an image of the bottom of a normal bottle with no molding defects, FIG. 7B is an image of the bottom with misalignment, and FIG. 7C is an image of the bottom of the bottle. This is an image where whitening occurs on the outer circumferential side and uneven thickness occurs in the area X3 on the center side of the bottom. In the image of FIG. 7B in which misalignment has occurred, region X2 with high fluorescence intensity is relatively enlarged compared to the normal image of FIG. 7A, and its position is also confirmed to be eccentric compared to the normal image. can. In the image of Figure 7C where uneven thickness and whitening have occurred, compared to the normal image of Figure 7A, it is confirmed that the outer periphery of the bottom appears brighter due to the influence of whitening, and the center side appears brighter due to the influence of uneven thickness. can. In addition, in the example shown in Fig. 7C, an over-stretched state occurs in which stretching progresses excessively on the outer circumferential side of the bottom due to uneven thickness at the center, and as a result, densification and crystallization progresses, which is the cause of the defect. It is inferred.

8A and 8B are examples of the bottom corner of the bottle taken from diagonally below in FIG. 1. FIG. 8A is an image of a normal bottle with no molding defects, and FIG. 8B is an image of a bottle with whitening in area X4. This is an image of the bottle. Comparison of these images confirms that the fluorescence intensity in areas where whitening has occurred is higher than in the normal case. 9A to 9C are examples of images of a part of the body of a bottle. FIG. 9A is an image of a normal bottle with no molding defects, FIG. 9B is an image of a bottle with slight whitening, and FIG. 9C is an image of a bottle with slight whitening. This is an image of a bottle with clear whitening. Comparison of these images also confirms that the fluorescence intensity is higher in areas where whitening has occurred than in normal cases. 10A and 10B are examples of images taken of the mouth of a bottle. FIG. 10A is an image of a normal bottle with no molding defects, and FIG. 10B is an image of a bottle with molding defects such as yellowing over almost the entire mouth. It is an image. Comparison of these images confirms that the fluorescence intensity is higher in areas where yellowing occurs than in normal cases. Although the cause of yellowing is not necessarily clear, crystallization progresses locally due to inadequate molding conditions during preform molding, which increases the absorption efficiency in a specific wavelength range and causes a yellowish tinge. This is presumed to be one of the reasons.

As is clear from the example images above, in areas where molding defects such as uneven thickness or tissue defects occur, the intensity of the fluorescence generated in response to ultraviolet light irradiation is different from that of normal conditions without molding defects. The range of fluorescence intensity will be different from the range of fluorescence intensity at . Therefore, it is possible to determine the presence or absence of a molding defect using the intensity of fluorescence in an image of a bottle emitting fluorescence as a clue. For example, molding defects can be detected by determining whether or not there are locations in the image that exhibit fluorescence intensity that is outside the range of fluorescence intensity that should occur when there are no molding defects (for example, fluorescence intensity that is higher than the normal range). It is possible to determine the presence or absence of More specifically, we examine whether a bright area with relatively high fluorescence intensity appears in a normal bottle with no molding defects, where the fluorescence intensity is relatively low and should be a dark area in the image. However, if such a bright area appears, it can be determined that a molding defect has occurred. It may also be determined that there is a molding defect if a dark area appears in a normal bottle where it should be a bright area. Alternatively, the fluorescence intensity that should be observed when uneven thickness or tissue defects occur is known in advance, and the presence or absence of molding defects can be determined based on whether a location with such fluorescence intensity exists in the image. It's okay.

As shown in FIG. 7A, even in a normal bottle, a certain area centered around the bottom core appears as a bright area, or as shown in FIG. 8A, depending on the direction in which the bottle is imaged, Even if the bottle is normal, bright areas may appear in some parts of the image. Even if such a bright area appears, there are differences in the range, intensity, etc. of the bright area between normal conditions and defective molding, so the actual imaging is based on the normal fluorescence intensity distribution. By inspecting the differences in the distribution of fluorescence intensity (brightness distribution) in the images, it is possible to determine the presence or absence of molding defects. In determining the presence or absence of molding defects, not only differences in strength but also positional differences in intensity distribution may be taken into consideration. That is, not only information regarding intensity matches or mismatches, but also information regarding positional matches or mismatches may be taken into account in the test. For example, the position of a part with strength above a certain level is compared with the normal position to determine whether it matches or not, and if the position is different, a molding defect has occurred, or there is a possibility that a molding defect has occurred. It may be determined that there is.

Returning to FIG. 1, the processing section 20 of the inspection device 1 will be explained. The processing unit 20 inspects the presence or absence of molding defects based on the fluorescence intensity in the image captured by the image acquisition unit 10. The processing unit 20 is configured using, for example, a computer unit including a CPU and an internal storage device necessary for its operation. The processing section 20 is provided with an image adjustment section 21 and an inspection section 22. The image adjustment section 21 and the inspection section 22 are provided as logical devices realized by, for example, a combination of the computer hardware of the processing section 20 and an inspection program PG, which is an example of a computer program as software. However, at least a portion of the processing unit 20 may be configured as a physical device combining logic circuits such as LSI. Note that the processing unit 20 may be connected to various input means such as a keyboard and a pointing device for the operator of the inspection apparatus 1 to input appropriate instructions. In FIG. 1, illustration of input means is omitted.

The image adjustment unit 21 receives the image signal output from the camera 13 and performs image processing suitable for the inspection by the inspection unit 22 to convert the image captured by the camera 13 into an image suitable for the inspection by the inspection unit 22. adjust. For example, the image adjustment unit 21 may perform correction processing for image brightness, contrast, and the like. The inspection section 22 receives the image signal processed by the image adjustment section 21 and inspects the presence or absence of molding defects. Thereby, the inspection section 22 functions as an example of inspection means.

The processing of the inspection unit 22 may be configured as appropriate as long as the presence or absence of molding defects can be determined based on the fluorescence intensity in the image. For example, the inspection unit 22 uses the difference in brightness in the image captured by the camera 13 to binarize the image, treating the range where the fluorescence intensity exceeds a predetermined judgment value as a bright area and the other range as a dark area, and then In an image of a bottle, if a bright area appears at a location where no bright area exists, that location may be determined as a location of defective molding. As described above, if even a normal bottle has a bright area where the fluorescence intensity is relatively high, an inspection method may be configured to avoid erroneously determining the bright area as a molding defect. For example, an image of a normal bottle is prepared as a reference image, and the difference between the image of the inspection range that was actually captured and the reference image is taken, and a bright area appears in the position that should be a dark area in the reference image. In this case, the bright area may be determined to be a molding defect. Alternatively, without taking the difference, prepare a mask that shows the range where bright areas appear in a normal bottle, and superimpose the image of the inspection range that was actually taken and the mask to see if bright areas appear even in normal conditions. Processing may be applied in which a range where the range is excluded from the range to be detected as a bright part by the inspection unit 22. Furthermore, if a dark area appears at a position that should be a bright area in a normal bottle, the dark area may be determined to be a molding defect. When it is determined that there is a molding defect, the inspection section 22 may display the defective location on the monitor 23 or store it in the storage device 24 as an inspection result. The means for outputting test results is not limited to the monitor 23 and the storage device 24, but a printer may be connected as the output means.

As explained above, according to the inspection device 1 of the present embodiment, the inspection range of the bottle 2 to be inspected is illuminated with ultraviolet light from the illumination device 11, and an image of the bottle 2 emitting fluorescence is displayed in the wavelength range of the fluorescence. The camera 13 captures an image in such a way that the wavelength range of ultraviolet light is included in the wavelength range of the imaging target while being excluded from the wavelength range of the imaging target, and the inspection unit 22 uses the fluorescence intensity in the captured image to The presence or absence of molding defects can be inspected. According to such an inspection method, the presence or absence of molding defects can be inspected by image processing without relying on visual inspection by the operator, so it is possible to efficiently and highly accurately inspect the presence or absence of molding defects. can. It is also possible to apply the inspection device 1 to a bottle molding line and successively inspect the presence or absence of molding defects in-line.

The present invention is not limited to the above-described embodiments, but can be applied to various molding defects inspections on resin molded products. The resin molded article is not limited to the example formed by blow molding, but may be formed by injection molding. The excitation light used for illuminating resin molded products is not limited to ultraviolet light. The excitation light only needs to be able to emit light in a wavelength range different from the wavelength range of the irradiated light from the resin molded product, and the excitation light that can emit Raman scattered light as the detection target light is used for illumination. May be used for. Therefore, the excitation light is not limited to the ultraviolet range, but may include the visible light wavelength range. In any case, if the wavelength range of the detection target light is different from that of the excitation light and it is possible to capture an image of the detection target light while excluding the image of the excitation light wavelength range, the excitation light and the detection target light can be separated. The combination may be changed as appropriate. The material of the resin molded product is not limited to PET resin, but various resins may be used as long as they have the property of emitting light in a wavelength range different from the excitation light when irradiated with excitation light such as ultraviolet light. . Furthermore, the resin molded products to be inspected are not limited to bottle-shaped containers, and resin molded products for various uses may be inspected as long as they are formed by blow molding. An example in which a resin molded product different from a PET bottle is to be inspected will be explained with reference to FIGS. 11A to 12D.

FIGS. 11A to 12D show examples of medical syringes with molding defects. A medical syringe is an example of a resin molded product, and is formed by injection molding using COP resin (cycloolefin polymer resin) as a material. 11A to 11C are examples in which the inspection area is near the discharge port P of the syringe. FIG. 11A is a drawing of the vicinity of the discharge port of the syringe where the molding defect actually occurred, and FIG. 11B is the syringe shown in FIG. 11A. Figure 11C is an image taken by illuminating the inspection range of the actual object with ultraviolet light and capturing the reflected ultraviolet light from the direction directly facing the discharge port P (direction facing the axial direction). This is an image captured from the same direction in the same range as FIG. 11B, limited to the wavelength range of light emission. As shown in FIG. 11A, burrs D5 are formed on the inner surface of the discharge port P as a molding defect. The burr D5 is caused by the increasing density and crystallization of the resin within the mold, and can be considered as a type of the above-mentioned structural defect. Although burrs appear as bright areas in both Figures 11B and 11C, in Figure 11B, which is an image of reflected ultraviolet light, normal areas other than burrs also appear as bright areas, making it difficult to distinguish. . On the other hand, in FIG. 11C, which is an image in the fluorescence wavelength range, it can be confirmed that the burr part emits fluorescence at a clearly higher intensity than other parts, as shown by region X5.

FIGS. 12A to 12D show an example in which the flange portion of the syringe is the inspection range. The flange portion is located on the side opposite to the discharge port of the syringe, and is a portion that is integrally molded with the cylindrical portion of the syringe as a part on which a finger is placed when operating the syringe. FIG. 12A is a drawing of the flange portion of a syringe in which a molding defect actually occurred. A pair of notches C are formed in the flange portion so as to be located on one diagonal line, but one of the notches C has a defect D6 called a gate horn. FIG. 12B shows an enlarged image of the actually occurring defect D6. Defect D6 is a molding defect caused by poor management near the resin injection port (gate) into the mold, and is caused by increased densification and crystallization, and is considered a type of microstructural defect described above. It is possible to capture it.

In FIG. 12C, the entire flange shown in FIG. 12B is illuminated with ultraviolet light as an inspection range, and the inspection range is imaged by capturing the reflected ultraviolet light from a direction directly facing the flange (direction facing the axial direction). The image in FIG. 12D is an image obtained by capturing the same range as FIG. 12C from the same direction by limiting the wavelength range of the imaging target to the wavelength range of fluorescence emission. Note that in FIGS. 12C and 12D, markers set during the image processing process are shown as thin white lines, but these do not indicate the intensity of reflected light or fluorescence. In the ultraviolet light image of FIG. 12C, it is impossible or difficult to identify the portion corresponding to defect D6. On the other hand, in the image of FIG. 12D, which is an image in the fluorescence wavelength range, it can be confirmed that the defect D6 portion emits fluorescence at a clearly higher intensity than other portions, as shown by region X6.

As is clear from the examples in FIGS. 11A to 12D, tissue defects in syringes formed by injection molding can also be clearly detected by capturing images in the fluorescence wavelength range, as in the case of PET resin bottles. It is possible to do so. Similarly, regardless of the resin material or the molding method of the resin molded product, if there is a molding defect that increases the wall thickness, or a molding defect that increases the density or crystallization of the resin, it can be detected based on the fluorescence intensity in the image. It is possible to determine the presence or absence of molding defects.

In one aspect of the present invention, the condition of the resin molded product that can be inspected is not limited to the presence or absence of molding defects. If we take the correspondence between the intensity of the detection target light emitted when a resin molded product is irradiated with excitation light such as ultraviolet light and the state of at least one of the shape and structure of the resin molded product as a clue, , it is possible to inspect various conditions using a method similar to the above embodiment. For example, marking portions representing various information such as letters, numbers, symbols, etc. may be formed on resin molded products such as bottles. The marking portion may include elements common to the above-mentioned molding defects such as uneven thickness defects and texture defects in that the shape and structure of the resin molded product have changed. In other words, molding defects in resin molded products are caused by changes in the shape, such as wall thickness, from the original shape, or changes in the structure of the resin molded product itself, such as whitening or yellowing, from the original structure. It happens. On the other hand, the marking part is a method that changes the structure of the resin by transferring the uneven shape on the mold to the resin molded product, or by applying laser marking treatment to locally carbonize, melt, or foam the resin. may be formed by Regarding the marking part formed by such a method, the intensity of the detection target light changes with respect to the surroundings of the marking part, and it is possible to detect the change using the change as a clue.

FIG. 13 shows an image of the markings applied to the shoulder of the bottle and the surrounding area taken by the inspection device 1 shown in FIG. An example is shown. Furthermore, an example of an image obtained by illuminating the same bottle with visible light in the wavelength range and capturing the image in the same wavelength range as the illumination light is shown. As is clear from comparing those images, in the image of FIG. 13, the marking part is displayed as a high-brightness part in area X7, and there is a difference in brightness between the marking part and its surroundings. can be confirmed. The marking portion shown in FIG. 13 is formed using a laser marking method, and the resin of the bottle melts and foams at the laser-marked portion, changing the structure and crystal structure. It is presumed that as a result of such a change in structure, the intensity of the fluorescent light emission is higher than that around the marking part, thereby increasing the difference in brightness and darkness. The marking section shown in Fig. 13 is composed of a combination of letters, numbers, and symbols for use in bottle traceability, for example, but since the images are taken of bottles that were actually distributed, the marking section is The parts are shown masked. The brightness of the masked part is the same as that of other parts of the marking part.

FIG. 15 shows an example of an image taken by the inspection device 1 of FIG. 1 of the marking part applied to the neck of the bottle and the surrounding area. The marking part in FIG. 15 is formed by a method of transferring the uneven shape applied to the mold during the preform molding stage to the neck part, and the shape at the marking part changes from the shape of its surroundings. It is possible to consider this as an example of a passage. The wall thickness at the marking portion is equivalent to the wall thickness around it. However, the wall thickness at the marking portion may be different from the wall thickness around the marking portion. Alternatively, a structural change such as increased density may occur in at least a portion of the marking portion due to overstretching of the resin or the like. In the image of FIG. 15, the marking part, especially the edge part, is displayed as a high brightness part in the area X8, and it can be confirmed that there is a difference in brightness between the marking part and its surroundings. If the thickness of the marking area changes more than the surrounding area, or if a structural change similar to whitening occurs, the fluorescence intensity of the marking area will become higher, similar to the case of uneven thickness or tissue defects described above. , it is estimated that the difference in brightness between the marking part and its surroundings will further increase.

According to the image in FIG. 13, it can be confirmed that locations where the bottle's organizational structure or crystal structure has changed can be detected using the above-mentioned inspection method, and the image in FIG. 15 shows that the bottle's shape is It can be confirmed that the inspection method according to the above-mentioned embodiment can detect a location where the change is occurring. In the inspection of the marking part, for example, it is possible to detect the part showing the fluorescence intensity that should be observed in the marking part based on the fluorescence intensity in the obtained image, and to inspect the marking part based on the detection result. It is. In this case, the inspection targets various matters related to the marking part, such as whether the marking part is formed correctly, whether the position of the marking part is appropriate, and whether the information indicated by the marking part is correct. It's okay to be.

Inspection of the shape and structure of the resin molded product may be performed in parallel or in sequence regarding a plurality of inspection items. For example, the presence or absence of molding defects and the suitability of the marking portion may be inspected in parallel or sequentially from the same image. If such a complex inspection is performed using a common inspection device, there will be an advantage that the time required for the inspection can be shortened or the load on the equipment required for the inspection can be reduced.

In the above embodiment, the imaging device 12 including the camera 13 is used as the imaging means, but the imaging means is not necessarily limited to an example using a camera. In the inspection of the present invention, if data representing the signal intensity corresponding to the intensity of the detection target light in the inspection range of the resin molded product can be obtained, the presence or absence of molding defects is determined based on the intensity of the detection target light indicated by the data. It is possible to inspect. Therefore, data reflecting the intensity of the detection target light is obtained using various sensors that output detection signals according to the intensity of the detection target light, and the data is shaped based on the intensity of the detection target light in the obtained data. The presence or absence of defects may be inspected. For example, data indicating the intensity distribution of the detection target light in the inspection range may be acquired using a light intensity sensor having a two-dimensional planar detection range. Alternatively, data indicating the intensity distribution of the detection target light in the inspection range may be acquired by scanning the inspection range with a one-dimensional light intensity sensor (line sensor). The data thus acquired is substantially equivalent to the image data acquired by the camera 13 of the above configuration in that it has a signal intensity that corresponds to the intensity distribution of the detection target light. Therefore, such data is also included in the concept of "image" in the present invention, and a detection device using various sensors for acquiring such data is included in the concept of "imaging means" in the present invention. It is included in

Various aspects of the present invention derived from each of the embodiments and modifications described above will be described below. In the following description, in order to facilitate understanding of each aspect of the present invention, corresponding components illustrated in the accompanying drawings will be added in parentheses, but the present invention is not limited to the illustrated form. It's not something you can do.

The inspection method for a resin molded product according to one aspect of the present invention is an inspection method for inspecting a resin molded product (2), in which light in a wavelength range different from the wavelength range of the irradiated light is used as detection target light. A step of illuminating an inspection range of the resin molded product with excitation light that can be emitted from the resin molded product, and a step of illuminating the inspection range of the resin molded product illuminated with the excitation light with the detection target light. A procedure for imaging such that the wavelength range of the excitation light is included in the wavelength range of the imaging target while the wavelength range of the excitation light is excluded from the wavelength range of the imaging target, and the intensity of the detection target light in the captured image. The method includes a procedure for inspecting the presence or absence of molding defects in the inspection range based on the inspection range.

An inspection device (1) for a resin molded product according to one aspect of the present invention is an inspection device for inspecting molding defects in a resin molded product (2), and is an inspection device that uses a wavelength range different from the wavelength range of the irradiated light. illumination means (11) for illuminating an inspection range of the resin molded product with excitation light that can be emitted from the resin molded product as detection target light; and Imaging means (12) for imaging the inspection range in such a way that the wavelength range of the detection target light is included in the wavelength range of the imaging target, while the wavelength range of the excitation light is excluded from the wavelength range of the imaging target; and an inspection means (22) for inspecting the state of at least one of the shape and structure of the resin molded product in the inspection range based on the intensity of the detection target light in the captured image. It is something.

If there is any change in the shape or structure of the resin molded product, for example, the wall thickness of the resin molded product may locally increase or decrease compared to its normal state, or the molecular chains of the resin may become oriented. If molding defects occur such as densification, crystallization progresses, and local deformation of the resin structure, or if the shape or structure of the resin molded product is intentionally changed, The intensity of the emitted light to be detected will be different from that in the case where the above change has not occurred. Therefore, if the inspection range of a resin molded product illuminated with excitation light is imaged with the wavelength range of the imaging target set as described above, the intensity of the detection target light in the obtained image can be reduced. As a clue, the state of at least one of the shape and structure of the resin molded product can be inspected. Since the condition of the resin molded product can be inspected by image processing, it is possible to perform the inspection more efficiently and with higher precision than conventional inspections that rely on visual inspection.

In the testing procedure or means, the condition of the resin molded product may include testing for molding defects regarding at least one of the shape and structure of the resin molded product. According to this, it is possible to inspect the presence or absence of molding defects efficiently and with high precision.

In the above aspect, the excitation light may be ultraviolet light, for example, and the detection target light may be fluorescence generated in the resin molded product. In the inspection step, the presence or absence of the molding defect is determined by determining whether or not there is a location in the image that shows an intensity outside the range of the intensity of the detection target light when the molding defect does not occur. may be inspected. The inspection means may also be inspected in the same manner. In this case, it is possible to detect molding defects efficiently and with high precision by inspecting whether there are any places in the image where the intensity of the detection target light deviates from the normal range due to molding defects. It is possible.

In the inspection procedure or means, a location of the intensity of the detection target light that should be observed in the case where a molding defect occurs due to a thickness deviation in the resin molded product or a change in the crystal structure of the resin is detected in the image. The presence or absence of the molding defect may be inspected by determining whether or not it exists. The inspection means may also be inspected in the same manner. In this case, it is possible to detect molding defects caused by deviations in wall thickness or changes in crystal structure based on the intensity of the detection target light in the image.

In the testing procedure or means, the condition of the resin molded product may be a marking portion formed by changing at least one of the shape and the structure of the resin molded product. Furthermore, in the inspection procedure or means, a location of the intensity of the detection target light to be observed at the marking part in the resin molded product may be detected, and the marking part may be inspected based on the detection result. According to this, it is possible to inspect the suitability of the marking portion using the fluorescence intensity in the image as a clue.

In the above embodiment, the resin molded product may be formed by blow molding or injection molding. According to this, molding defects of resin molded products formed by blow molding or injection molding can be inspected efficiently and with high precision according to the present invention.

1 Inspection device 2 Bottle (resin molded product)
11 Lighting device (lighting means)
12 Imaging device (imaging means)
13 Camera 14 Filter 20 Processing section 22 Inspection section (inspection means)
D1, D2 Uneven thickness part D3 Misalignment part D4 White

Claims

An inspection method for inspecting a resin molded product,
a step of illuminating an inspection range of the resin molded product with excitation light that can emit light in a wavelength range different from the wavelength range of the irradiated light from the resin molded product as detection target light;
The inspection range of the resin molded product illuminated with the excitation light is such that the wavelength range of the detection target light is included in the wavelength range of the imaging target, and the wavelength range of the excitation light is outside the wavelength range of the imaging target. a procedure for taking an image while excluding the
A step of inspecting the state of at least one of the shape and structure of the resin molded product in the inspection range based on the intensity of the detection target light in the captured image;
Inspection method for resin molded products containing
2. The method for inspecting a resin molded product according to claim 1, wherein in the testing step, the condition of the resin molded product is to check for molding defects in at least one of the shape and structure of the resin molded product.
In the inspection step, the presence or absence of the molding defect is determined by determining whether or not there is a location in the image that shows an intensity outside the range of the intensity of the detection target light when the molding defect does not occur. 3. The method for inspecting a resin molded product according to claim 2, wherein:
In the inspection procedure, there is a location in the image where the intensity of the detection target light is to be observed when a molding defect occurs due to a deviation in wall thickness in the resin molded product or a change in the crystal structure of the resin. The method for inspecting a resin molded product according to claim 2, wherein the presence or absence of the molding defect is inspected by determining whether or not the molding defect occurs.
The resin molded product according to claim 1, wherein in the testing step, the state of the resin molded product is a marking portion formed by changing at least one of the shape and the structure of the resin molded product. inspection method.
The resin according to claim 5, wherein in the inspection step, a location of the intensity of the detection target light to be observed in the marking portion of the resin molded product is detected, and the marking portion is inspected based on the detection result. Inspection method for molded products.
An inspection device for inspecting molding defects of resin molded products,
illumination means that illuminates an inspection range of the resin molded product with excitation light that can cause the resin molded product to emit light in a wavelength range different from the wavelength range of the irradiated light as detection target light;
The inspection range of the resin molded product illuminated with the excitation light is such that the wavelength range of the detection target light is included in the wavelength range of the imaging target, and the wavelength range of the excitation light is outside the wavelength range of the imaging target. an imaging means for taking an image in such a manner that the
Inspection means for inspecting the state of at least one of the shape and structure of the resin molded product in the inspection range based on the intensity of the detection target light in the captured image;
Inspection equipment for resin molded products including
The inspection device for a resin molded product according to claim 7, wherein the inspection means inspects the presence or absence of a molding defect regarding at least one of the shape and the structure of the resin molded product as the condition of the resin molded product.
The inspection means determines the presence or absence of the molding defect by determining whether or not there is a location in the image that shows an intensity outside the range of the intensity of the detection target light when the molding defect does not occur. The inspection device for resin molded products according to claim 8.
The inspection means determines whether there is a location in the image with the intensity of the detection target light that should be observed when a molding defect occurs due to a thickness deviation in the resin molded product or a change in the crystal structure of the resin. 9. The inspection apparatus for resin molded products according to claim 8, wherein the presence or absence of the molding defect is inspected by determining whether or not the molding is defective.
The resin molded product according to claim 1, wherein the inspection means inspects a marking portion formed by changing at least one of the shape and the structure of the resin molded product as the state of the resin molded product. Inspection equipment.
The resin molding according to claim 11, wherein the inspection means detects a location of the intensity of the detection target light to be observed in the marking portion of the resin molded product, and inspects the marking portion based on the detection result. Product inspection equipment.