JP2013242166A - Method for manufacturing product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing products that enables prevention of forgetting to stick and peel protective films and checks on products through the protective films.SOLUTION: The method comprises: a sticking step A of sticking protective films 2 each comprising a film substrate 3 that is protective against scratches and light transmissive and an adhesive layer 4 to a transparent adhesive of which a fluorescent dye emitting light in response to black lights L is added on products M manufactured on industrial production lines; and a check step Z of checking whether the protective films 2 are stuck on the surfaces of the products M by detecting the presence of light emission from the adhesive layers 4 during irradiation from the black lights L in the dark at intermediate steps or the final step on the production lines.

Description

  The present invention relates to a method for manufacturing a product.

  2. Description of the Related Art Conventionally, a protective sheet (protective film) is attached to prevent a product from being damaged (see, for example, Patent Document 1).

  However, when the protective sheet is translucent, there is a drawback that forgetting to stick or forgetting to peel off easily occurs. Then, although the visibility for confirming the presence or absence of a protective sheet using an opaque colored protective sheet is also improved, there is a drawback that it is not possible to inspect directly through the protective sheet.

JP 2012-17417 A

  The problem to be solved is that when the protective sheet is translucent, it is easy to forget to attach or remove the protective sheet. In addition, in the case of an opaque colored protective sheet, it cannot be inspected as it is through the protective sheet.

  Therefore, in the method for producing a product according to the present invention, a product manufactured on an industrial production line includes a light-transmitting film base material for preventing scratches and a fluorescent dye that emits light in response to black light. A protective film comprising a pressure-sensitive adhesive layer added to the transparent pressure-sensitive adhesive is provided with a sticking step for sticking, and in the intermediate process to the final process of the production line, irradiation with black light in a dark room atmosphere, It is a method comprising an inspection step of inspecting the presence or absence of sticking of the protective film to the product surface by detecting the presence or absence of light emission from the pressure-sensitive adhesive layer.

Further, the fluorescent dye is a method comprising an optical brightener.
In addition, the concentration of the fluorescent dye added to the pressure-sensitive adhesive layer is set to 0.1 wt% or more and 10 wt% or less.
The detection of light emission from the pressure-sensitive adhesive layer is performed by measuring the color or brightness of light emission of the fluorescent dye.
In the inspection process, an automatic detection device that measures the color or brightness of light emission of the fluorescent dye is used.
In the inspection process, photometric measurement of the color or brightness of the light emitted from the fluorescent dye is a method of detection using a camera.

  According to the manufacturing method of the product of the present invention, it is possible to prevent forgetting to stick or to forget to peel off the protective film and to inspect it through the protective film.

It is a front view which shows one Embodiment of this invention. It is a cross-sectional side view which shows a sticking process. It is a top view which shows an inspection process. It is a top view which shows an inspection process.

  FIG. 1 shows a main part of one embodiment of the present invention. Product M flows in the direction of arrow Y. The manufacturing method of this product includes a sticking process A for sticking a protective film 2 that emits light in response to the black light L to a product M manufactured on an industrial production line, and an intermediate process to a final process ( In the step after the sticking step), the black light L is irradiated in a dark room atmosphere and the presence or absence of light emission from the protective film 2 is detected to determine whether the protective film 2 is stuck on the product M surface. An inspection process Z for inspection is provided.

  In the present invention, “product” includes a finished product and a semi-finished product. Completed products include parts and parts that are unitized (assemblies). Semi-finished products include parts and assemblies. Specifically, the products are electrical equipment, medical equipment, precision mechanical equipment, measuring equipment, and the like.

  FIG. 2 shows a sticking process. The protective film 2 is composed of a translucent film base material 3 for preventing scratches and an adhesive layer 4. The translucent film substrate 3 is made of, for example, polyethylene terephthalate or vinyl chloride. In the pressure-sensitive adhesive layer 4, a fluorescent dye 1 that emits light in response to the black light L (see FIG. 1) is added to a transparent pressure-sensitive adhesive (for example, urethane pressure-sensitive adhesive). The fluorescent dye 1 is made of, for example, a fluorescent brightening agent. Thus, the adhesive layer 4 is transparent.

  Set the concentration of fluorescent dye 1 to 0.1 wt% or more and 10 wt% or less. More desirably, it is 0.5 wt% or more and 5 wt% or less. When the concentration of the fluorescent dye 1 is less than the lower limit, the degree of light emission is low (light emission is weak), and the presence or absence of light emission cannot be detected. When the concentration of the fluorescent dye 1 exceeds the upper limit value, the concentration is higher than necessary and the fluorescent dye 1 is useless, and the cost is increased.

In the present invention, the film substrate 3 is “translucent” means that the total light transmittance (JIS K 7361-1) is 70% or more or Haze (JIS K 7136) 20% or less. .
The thickness of the film substrate 3 is preferably 3 to 200 μm, and the thickness of the pressure-sensitive adhesive layer 4 is preferably 3 to 50 μm.
Fluorescent dyes are low boiling point polymer compounds that are inferior in heat resistance and have fluorescence that is inferior in durability because dye molecules migrate easily.
Therefore, regarding the addition of the fluorescent dye to the film substrate 3, when the film substrate 3 is formed and manufactured, the film material is thermally melted at a high temperature of 160 ° C. or higher, so that a load of heat history is applied to the film material and the dye is decomposed or vaporized Dye loss may occur, or plate out to a processing machine may occur, and defects such as choking, bloom, bleed out, etc. may occur on the film substrate, impairing durability. However, in the present invention, since the fluorescent dye as described above is added to the pressure-sensitive adhesive layer 4, the dye cost, production stability, and durability are remarkably excellent.

  Returning to FIG. 1, the light emission from the pressure-sensitive adhesive layer 4 in the inspection process Z is detected by measuring the color or brightness of the light emission of the fluorescent dye 1. Photometry of the emission color or brightness of the fluorescent dye 1 is detected using the camera C. And the automatic detection apparatus X which measures the color or brightness of the light emission of the fluorescent dye 1 is used. As the automatic detection device X, for example, a spectrometer or a Macbeth densitometer (Macbeth color densitometer) (manufactured by Gretag Macbeth) is used. The camera C and the automatic detection device X may be separate from each other, or the automatic detection device X may have the camera C.

  FIG. 3 shows a case where the protective film 2 should be attached to the product M in the inspection process, and the product M (exemplified product of the mobile phone) is irradiated with the black light L (see FIG. 1). Indicates the state. The protective film 2 is forgotten to be applied to the second product M from the right. Since the protective film 2 is attached to the other three products M, they emit light when irradiated with the black light L, but the second product M from the right does not emit light. The absence of film 2 can be detected.

  FIG. 4 shows a state where the protective film 2 is to be peeled off from the product M in the inspection process and the product M is irradiated with the black light L (see FIG. 1). Since the second product M from the right is forgotten to peel off the protective film 2, the protective film 2 emits light, and the automatic detection device X can detect that the protective film 2 is present.

  Note that the present invention can be changed in design, and for example, one or a plurality of other processes may be interposed between the attaching process and the inspection process.

  As described above, the present invention relates to a translucent film base material 3 for preventing scratches on a product M manufactured on an industrial production line, and a fluorescent dye 1 that emits light in response to a black light L. Is provided with a sticking step A for sticking the protective film 2 comprising the pressure-sensitive adhesive layer 4 added to the transparent pressure-sensitive adhesive, and the black light L in the dark room atmosphere in the intermediate process to the final process of the production line. Irradiation and detection of the presence or absence of light emission from the pressure-sensitive adhesive layer 4 to provide an inspection process Z for inspecting the presence or absence of application of the protective film 2 to the product M surface. Alternatively, forgetting to peel off can be prevented. And it can inspect through the protective film 2.

  That is, since the fluorescent dye 1 emits light when irradiated with the black light L, the presence or absence of the protective film 2 can be confirmed, and the pressure-sensitive adhesive layer 4 is transparent (not only the translucent film substrate 3). The inspection can be performed with the protective film 2 attached.

Further, since the fluorescent dye 1 is composed of a fluorescent whitening agent, when the black light L is irradiated, the fluorescent whitening agent emits light, and the presence or absence of the protective film 2 can be easily confirmed.
Moreover, since the concentration of the fluorescent dye 1 added to the pressure-sensitive adhesive layer 4 is set to 0.1 wt% or more and 10 wt% or less, necessary and sufficient light emission intensity can be obtained. That is, light can be emitted to a detectable level and unnecessary costs can be prevented from increasing.
Moreover, since the light emission from the adhesive layer 4 is detected by measuring the color or brightness of the light emission of the fluorescent dye 1, it can be easily measured.
In the inspection process Z, since the automatic detection device X that measures the color or brightness of the emitted light of the fluorescent dye 1 is used, it can be measured easily and reliably.
In the inspection process, the photometric color or brightness of the fluorescent dye 1 is detected using the camera C, so that it can be detected easily and reliably.

DESCRIPTION OF SYMBOLS 1 Fluorescent dye 2 Protective film 3 Translucent film base material 4 Adhesive layer A Sticking process C Camera L Blacklight M Product X Automatic detection device Z Inspection process

Claims (6)

A product (M) manufactured on an industrial production line has a transparent film substrate (3) for preventing scratches and a fluorescent dye (1) that emits light in response to black light (L). A sticking step (A) for sticking a protective film (2) comprising a pressure-sensitive adhesive layer (4) added to a transparent pressure-sensitive adhesive,
And in the intermediate | middle process thru | or the final process of the said production line, it irradiates with black light (L) in dark room atmosphere, and detects the presence or absence of light emission from the said adhesive layer (4), The said protective film (2) The manufacturing method of the product characterized by including the inspection process (Z) which test | inspects the presence or absence of sticking to the said product (M) surface.   The method for producing a product according to claim 1, wherein the fluorescent dye (1) comprises a fluorescent brightening agent.   The manufacturing method of the product of Claim 1 or 2 which set the density | concentration of the said fluorescent dye (1) added to the said adhesive layer (4) to 0.1 to 10 wt%.   The method for producing a product according to claim 1, 2 or 3, wherein the light emission from the pressure-sensitive adhesive layer (4) is detected by measuring the light emission color or brightness of the fluorescent dye (1).   The method for producing a product according to claim 1, 2, 3, or 4, wherein in the inspection step (Z), an automatic detection device (X) that measures the color or brightness of light emission of the fluorescent dye (1) is used.   The method for producing a product according to claim 1, 2, 3, 4 or 5, wherein in the inspection step, the photometric color or brightness of the fluorescent dye (1) is detected using a camera (C). .

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