JPH0649312U - Foreign body lump detection device - Google Patents

Abstract

(57) [Abstract] [Purpose] It is intended to provide an apparatus for automatically detecting an unpredictable lump of foreign matter in a composite product that is macroscopically flat and has flexibility. [Structure] Strain gauge type load transducer 1 on response roll 2
When a support roll 3 is attached to the lower side of the response roll 2 and the composite product is inserted between the nip between the response roll 2 and the support roll 3 and there is a foreign substance lump in the composite product. When the response roll 2 is lifted,
The strain gauge type load transducer 1 on it detects it and detects the foreign substance lump in the composite.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a defect detecting device for a composite product which is macroscopically flat and has flexibility, and particularly for a defective product having an unforeseeable lump of foreign matter.

[0002]

[Prior art]

 Today, when manufacturing composite products that are macroscopically flat and have flexibility, such as sanitary products such as disposable diapers, paper, coated paper, etc., periodically or intermittently during or after the manufacture. Inspections are conducted by inspectors to detect defective parts and defective products. Separately from that, a highly accurate automatic product inspection system that does not rely on human labor such as inspectors has been introduced to detect defective parts and defective products.

That is, in the case of disposable hygiene products, a detection system metal detector using a photoelectric tube, a weight counter, a quantity counter, a shape inspection system in which a camera and a strobe are integrated, and the like are used.

Further, in the case of paper, coated paper, etc., a thickness using a beta ray, a grammometer, a spot detector using a photoelectric tube, an automatic gloss meter, etc. are used.

[0005]

[Problems to be solved by the present invention]

 However, despite these product inspection systems, lumps of foreign matter due to dripping of hot melt adhesive, crushed fluff pulp that looks normal in macroscopic view, and fine grids on coated paper are not Since it is a fixed form and its location cannot be predicted, it is difficult to detect it with high accuracy and automatically, and defective products containing such foreign matter lumps often appear in the market.

For example, in the production of disposable hygiene products, an absorbent body made of fluff pulp mat, absorbent polymer, water-absorbent paper, etc. is sandwiched between the top sheet web and the back sheet web, and the elastic elastic body of the crotch part and the waist part are provided. The stretchable elastic body and the like are sandwiched in a stretched state at a predetermined position between the front and back sheet webs as necessary, and internally bonded by a hot melt adhesive.

[0007] In this case, due to insufficient adjustment of contact conditions between the sheet web to be coated and the hot-melt adhesive coating head or insufficient suitability for coating the hot-melt adhesive, an extra portion around the hot-melt adhesive coating head is provided. Hot melt adhesive may build up.

When excess hot melt adhesive adheres to the periphery of the coating head, irregular and irregular lumps of hot melt adhesive drop on the product web to cause defective products. . Most of this can be prevented by setting the hot melt application conditions optimally, but the application conditions may fluctuate subtly due to variations in the viscosity of the hot melt adhesive, variations in the web thickness, etc. accumulate.

Further, the fluff pulp which constitutes the absorber is used after being processed from the sheet state into a cotton-like pulp through an opening step, but the fluff pulp fibers are accumulated in an unopened lump or at a specific place in the production facility. However, it grows and expands, and when it drops onto the product web before lamination, defective products also occur.

Further, in the case of coated paper products, in order to improve printing suitability, a coating material containing a pigment such as kaolinite clay and calcium carbonate and an adhesive is coated on the uncoated base paper. If the dispersal grid passes through the filter and is applied as is, it will deteriorate the print finish and result in defective products.

The present invention has an irregular shape in a manufacturing facility for macroscopically flat and flexible composite products (disposable sanitary goods, paper, coated paper, etc.) It is an object of the present invention to provide a foreign substance lump detection device that can automatically detect a foreign substance lump that cannot be predicted with high accuracy.

[0012]

[Means for Solving the Problems]

 The present invention relates to a manufacturing facility for a composite product which is macroscopically flat and has flexibility, and is provided with a supporting roll on the upper side or the lower side of the running line of the composite product. On the opposite side, a rotating roll supported by a strain gauge type load transducer having a repulsive force responsive role is provided, and an unpredictable foreign body mass other than the design in the composite product has the supporting role. The dynamic load repulsive force when passing through the nip between the rotating roll of the above and the rotating roll supported by the strain gauge type load converter is converted into an electric signal by the strain gauge type load converter and The foreign matter lump detection device is configured to detect a foreign matter lump in a composite product from a voltage difference.

The strain gauge type load transducer in the present invention is a transducer having a strain gauge sensor made of a metal resistor whose electric resistance greatly changes due to deformation within the elastic limit, and the strain gauge sensor is provided with an expansion and contraction. The load in that case is calculated by measuring the displacement of elastic deformation using the change in electrical resistance caused by.

The metal resistor used as the strain gauge sensor is a thin wire of copper-nickel alloy with a diameter of about 25 μ, a foil with a thickness of 5 to 10 μ, a single crystal of a semiconductor of germanium or silicon, or vapor deposition of these metals. A film or the like is used.

[0015]

[Action]

 The present invention is configured as described above, and when there is a foreign matter lump in a composite product that is macroscopically flat and has flexibility, the repulsive force response rotation roll changes its position due to the foreign matter lump. The strain gauge sensor detects this fluctuation, and the electric resistance value in the normal state is different from that in the normal state. Therefore, it is possible to easily detect the foreign substance lump.

As for the position where the detection device is attached, if one is installed near the final product, one detection device can detect many foreign substance lumps. However, in this case, in the case of disposable hygiene products, the condition of the object to be inspected is after the various constituent materials such as fastening tape, leg gathers, waist gathers, etc. have been installed, so the electrical output due to the repulsive force response when passing through the normal part nip A complicated pattern is formed, and the detection sensitivity of a foreign substance block is reduced.

Further, since the absorber is installed after cutting it into individual products, the product thickness is different between the absorber part and the non-absorber part, and the repulsive force response rotary roll is used for the running line of the composite product. It is desirable to mount it on the upper side. The repulsive force-responsive rotary roll may be driven or not driven, but it is preferable to drive it because it is necessary to adjust the timing. However, when driving, noise increases and detection sensitivity tends to decrease.

When the top sheet and the back sheet are individually installed on the material before cutting, such as the absorber, paper, coated paper, etc., there is no need to set timing, so the detection sensitivity is better when not driven. High and small lumps of foreign matter can be detected.

[0019]

【Example】

 1 and 2 show an embodiment of the present invention, the present invention will be described in detail with reference to the drawings. A strain gauge type load transducer 1 is attached to an upper part of a rotating roll (hereinafter referred to as a response roll) 2 having a repulsive force response role, and a rotating roll having a supporting role in parallel to the lower side of the response roll 2 The composite product (hereinafter referred to as the support roll) 3 is attached, and the composite product for which a lump of foreign matter is to be detected is inserted between the nip between the response roll 2 and the support roll 3.

As shown in FIG. 1, the strain gauge type load converter 1 has one end of a rectangular parallelepiped fixed to a fixed pedestal D and the other end fixed to an upper part of the support frame 4 of the response roll 2 and an intermediate portion thereof. The strain gauge 5 is embedded in the portion slightly fixed, and an elastically deformable portion 7 is formed on the outer side of which a plurality of thin metal plates 6 are attached so as to be orthogonal to the axis of the rectangular parallelepiped.

The elastic deformation section 7 absorbs the displacement of the response roll 2, and the strain gauge 5 senses the displacement. When the composite product passing through the nip is normal and there is no foreign matter lump, the response roll 2 maintains the state as it is, but the complex containing the foreign matter lump is as shown in FIG. When passing between the two rolls 2 and 3, the response roll 2 is pushed up, and the strain gauge 5 senses the presence of foreign matter lumps in the complex.

4 and 5 show another embodiment of the present invention (the same reference numerals as those in FIGS. 1 and 2 are the same members), but a part of the response roll is provided at both end portions of the outer peripheral surface of the response roll 2. A protrusion 8 having a diameter slightly larger than 2 is formed, and the response roll 2 and the support roll 3 can be rotated at the same rotation speed by the meshing rolls 9 and 10.

That is, what is shown in FIGS. 4 and 5 is used for detection of a disposable hygiene article, for example, a product after cutting the absorber into a disposable diaper and pasting the top sheet and the back sheet together. The thick portion with the absorber is detected by the portion other than the protruding portion 8 of the response roll 2, and the portion without the absorber is detected by the protruding portion 8. Therefore, it is desirable to set the thickness of the protruding portion 8 to be the thickness of the absorber sandwiched between the front surface and the back surface. Although the protruding portion 8 is formed on a part of the outer circumference of the response roll 2 in FIG. 5, it is not limited to this. For example, by forming it over the entire circumference of the end portion of the response roll 2, the disposable diaper is formed. It is possible to inspect the edges of the etc.

FIG. 6 is an output voltage signal chart showing foreign matter detection by a foreign matter lump detection device attached to a fluff mat running line having a basis weight of 200 g / m ² . In this case, the right and left in FIG. 6 mean that the strain gauge type load converter 1 is attached to the right and left of the response roll 2 as shown in FIG. 3 with respect to the traveling line of the composite product. It depends on the thing. Further, in the chart of FIG. 6, A and B are the following foreign substances. A 3 cm × 3 cm large fluff mat lump with a basis weight of 500 g / m ² Tightness 0.24 g / cm ³ Thickness about 2 mm B 2 cm × 2 cm large fluff mat lump with a basis weight of 500 g / m ² 0.24 g / cm ³ thickness about 2 mm

[0025]

[Effect of device]

 As described above, the present invention is a complex product that is macroscopically flat and has flexibility, and can easily generate irregular and irregular lumps of foreign matter in manufacturing facilities for disposable hygiene products, paper, coated paper, etc. In addition, it is possible to detect with high accuracy and automatically, and it is possible to sort out defective products due to lumps of foreign matter.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a perspective view of FIG. 1.

FIG. 4 is a front view of another embodiment of the present invention.

FIG. 5 is a side view of FIG.

FIG. 6 is an example of an output voltage signal chart when foreign matter is detected.

[Explanation of symbols]

 1 Strain gauge load converter 2 Response roll 3 Support roll 4 Response roll support frame 5 Strain gauge 6 Metal plate 7 Elastic deformation part 8 Projection part 9 and 10 Interlocking roll

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Creator Hideyuki Seguchi 1-10-6 Shinonome, Koto-ku, Tokyo Oji Paper Co., Ltd. Product Research Laboratory

Claims (1)

[Scope of utility model registration request] 1. In a manufacturing apparatus for a composite product which is macroscopically flat and has flexibility, a rotating roll having a supporting role is provided above or below the traveling line of the composite product. A dynamic load when an unpredictable lump of foreign matter in the composite product, which is provided, passes through the nip between the supporting roll and the rotating roll supported by the strain gauge type load transducer. A foreign matter lump detection device, characterized in that the repulsive force is converted into an electric signal by the strain gauge type load converter and the foreign matter lump in the composite product is detected from a voltage difference from a normal portion.