JP2009274262A - Method and device for observing inside of mold - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and a device for observing the inside of the mold which enable the clear observation of the foaming behavior of amorphous resins having high transparency and even the foaming behavior of those having low transparency. <P>SOLUTION: A pair of transparent bodies 11 and 12 are incorporated in a mold 1 for injection foaming molding so as to face each other with a cavity 4 between them. Illuminating light emitted from a light source 13 is allowed to enter the cavity 4 from the transparent body 11 through a red transparent plate 17, and the transmitted light is received by a high-speed camera 16 through the transparent body 12. Short-wavelength components in the illuminating light which tend to be scattered easily are removed by the red transparent plate 17, and most of scattered light scattered by spherulites and bubbles generated in foaming are removed by a polarizing plate, resulting in clear images of high-speed camera 16. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an in-mold observation method and an in-mold observation apparatus for observing the foaming behavior of a resin material in an injection foam molding mold.

  In the injection foam molding, knowing the foaming behavior of the resin material in the mold is important for obtaining a high-quality foam molded article. Conventionally, a glass body is assembled into an injection foam molding die facing the cavity, illumination light is incident on the cavity through the glass body, and the reflected light is received by an imaging means (high speed camera). Has already been observed (see, for example, Non-Patent Document 1).

Yamada, et al. "Molding '07" JSPP '07 Tech.Papers JUNE 6-8, 2007. TOKYO Japan Society for Plastic Molding Processing, p.79-80

  However, conventionally, resin materials to be observed in the mold have been limited to amorphous resins having high transparency such as polystyrene (PS), acrylic resin, and polycarbonate (PC). Because this uses a reflection method, a crystalline resin with low transparency, such as polypropylene (PP), reflects most of the irradiation light on the surface, making it difficult to visualize the inner part. In addition, even if the inner inner part can be visualized, it is because it is difficult to obtain a clear image (imaging) due to light scattering by spherulites and bubbles. In addition, even when targeting a highly transparent resin as described above, it is difficult to obtain clear imaging due to light scattering due to bubbles generated by overlapping in the thickness direction, and it is particularly difficult to observe the inner part, There was a problem.

  The present invention has been made in view of the above-described conventional technical background, and the subject is clearly an amorphous resin having a high transparency as well as a crystalline resin having a low transparency. An object of the present invention is to provide an in-mold observation method and an in-mold observation apparatus that can observe foaming behavior.

In order to solve the above-mentioned problems, the present invention makes illumination light enter a cavity of an injection foam molding mold through a transparent body incorporated in the mold, and the transmitted light is incorporated into the mold. Light is received by the imaging means through another transparent body, and the foaming behavior of the resin material is observed. In the present invention, as described above, the inside of the mold is observed by the transmission method, so that the inner back portion can be sufficiently visualized even with a resin material having low transparency.
In the following, some aspects of the present invention will be illustrated and described in terms of items.

  (1) Illumination light is incident on the cavity of the injection foam molding mold through a transparent body incorporated in the mold, and the transmitted light is transmitted through another transparent body incorporated in the mold by the imaging means. In the in-mold observation method for receiving light and observing the foaming behavior of a resin material, the illumination light is incident on the cavity through a red transparent plate.

  In the in-mold observation method described in the item (1), the illumination light is incident into the cavity through the red transparent plate, thereby removing the easily scattered short wavelength component included in the illumination light. The sharpness of imaging by the imaging means is improved.

  (2) Illumination light is incident on the cavity of the injection foam molding mold through a transparent body incorporated in the mold, and the transmitted light is transmitted through another transparent body incorporated in the mold by the imaging means. In the in-mold observation method for receiving the light and observing the foaming behavior of the resin material, the transmitted light of the illumination light is received by the imaging means through the polarizing plate.

  In the in-mold observation method described in this item (2), most of the scattered light due to the spherulites and bubbles generated with foaming is removed by receiving the transmitted light of the illumination light through the polarizing plate with the imaging means. As a result, the sharpness of the image pickup by the image pickup means is improved.

  (3) Illumination light enters the cavity of the mold for injection foam molding through the transparent body incorporated in the mold, and the transmitted light is transmitted through the other transparent body incorporated in the mold by the imaging means. In the in-mold observation method for receiving the light and observing the foaming behavior of the resin material, the illumination light enters the cavity through the red transparent plate, and the transmitted light of the illumination light is received by the imaging means through the polarizing plate. In-mold observation method characterized by this.

  In the in-mold observation method described in the item (3), the illumination light is incident on the cavity through the red transparent plate, thereby removing the easily scattered short wavelength component contained in the illumination light. By receiving the transmitted light of the illumination light through the polarizing plate by the imaging means, most of the scattered light due to the spherulites and bubbles generated with foaming is removed, and as a result, the sharpness of the imaging by the imaging means is greatly increased. improves.

  (4) A pair of transparent bodies are incorporated into an injection foam molding mold so as to face each other with a cavity interposed therebetween, and illumination light emitted from a light source is incident on the cavity through one of the transparent bodies, and the transmitted light. In the in-mold observation apparatus that receives light by the imaging means through the other transparent body, a red transparent plate is disposed between the light source and the one transparent body.

  (5) A pair of transparent bodies are incorporated into an injection foam molding mold so as to face each other with a cavity interposed therebetween, and illumination light emitted from a light source is incident on the cavity through one of the transparent bodies, and the transmitted light In the in-mold observation apparatus that receives light by the imaging means through the other transparent body, a polarizing plate is disposed between the other transparent body and the imaging means.

  (6) A pair of transparent bodies are incorporated in an injection foam molding mold so as to face each other with a cavity interposed therebetween, and illumination light emitted from a light source is incident on the cavity through one of the transparent bodies, and the transmitted light. In the in-mold observation apparatus for receiving light by the camera through the other transparent body, a red transparent plate is disposed between the light source and the one transparent body, and between the other transparent body and the camera. An in-mold observation apparatus characterized in that a polarizing plate is disposed between them.

  According to the in-mold observation method and the in-mold observation apparatus according to the present invention, the sharpness of imaging by the imaging means is improved, and the foaming behavior can be accurately grasped regardless of the type of the resin material. Since the foaming behavior of a crystalline resin having a low transparency and a large amount used industrially can be observed, the utility value is remarkably increased.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.

  1 and 2 show an embodiment of an in-mold observation apparatus according to the present invention. In FIG. 1, reference numeral 1 denotes an injection foam molding die composed of a fixed mold 2 and a movable mold 3. By closing the movable mold 3 with respect to the fixed mold 2, a molding space is formed between the two. The cavity 4 is formed. The cavity 4 extends in a direction perpendicular to the paper surface, and molten resin (foamed resin material) M is injected into the cavity 4 via a hot runner and a gate (not shown) provided in the fixed mold 2. (Pressurized injection).

  The in-mold observation apparatus 10 includes a pair of transparent bodies 11 and 12 that are assembled to face each of the movable mold 3 and the fixed mold 2 with the cavity 4 interposed therebetween, a light source 13 that emits illumination light, and the light source 13. The optical fiber cable 14 that guides the illumination light from the other transparent body 11 through the through hole 3 a formed in the movable mold 3 and the transmitted light of the illumination light emitted from the other transparent body 12 to the fixed mold 2. A high-speed camera (imaging means) 16 that receives light through the formed through-hole 2a and a mirror 15 attached to the fixed mold 2, a red transparent plate 17 disposed on the front surface of one transparent body 11, and an imaging means 16 is provided with a polarizing plate 18 rotatably disposed on the front surface. Each transparent body 11, 12 is fixed to the corresponding mold via a buffer body 20 by a press plate 19 bolted to the movable mold 3 and the fixed mold 2 here.

  Here, as the transparent bodies 11 and 12, glass having high strength and high heat resistance, for example, quartz glass is used. The type of the light source 13 is arbitrary, but it is desirable to select a light source that can easily obtain a large amount of light and that has little influence on the molten resin M in the cavity 4. An example of such a light source is a mercury lamp. The type of the high-speed camera 16 is arbitrary, but it is desirable to use a high-speed digital camera when it is desired to perform image analysis separately.

  Hereinafter, an in-mold observation method using the in-mold observation apparatus 10 configured as described above will be described.

  As described above, the molten resin M is injected from the hot runner through the gate into the cavity 4 and flows to the periphery of the cavity 4 while foaming at the tip. The light source 13 and the high-speed camera 16 constituting the in-mold observation apparatus 10 are activated prior to the injection of the molten resin M into the cavity 4 described above, and the tip of the molten resin M is a pair of transparent bodies. 11 and 12, the foaming situation occurring at the tip is continuously photographed by the high-speed camera 16.

  In the present embodiment, since the red transparent plate 17 is disposed on the front surface side of the transparent body 11 on the illumination light incident side, a short wavelength component contained in the illumination light is removed. Thereby, scattered light harmful to observation is reduced, and the sharpness of the video (imaging) taken by the high-speed camera 16 is improved accordingly. Further, since the polarizing plate 18 is disposed in front of the high-speed camera 16, only the specific polarized light included in the scattered light due to the spherulites and bubbles generated with the foaming in the cavity 4 is taken into the high-speed camera 16. As a result, most of the scattered light is removed, and the sharpness of the video (imaging) taken by the high-speed camera 16 is improved accordingly. As a result, not only an amorphous resin having a high transparency but also a crystalline resin having a low transparency can be clearly visualized in the depth direction in the thickness direction, and the foaming behavior can be clearly observed. The polarizing plate 18 is positioned in the rotation direction so that a clear image can be obtained as much as possible.

It is sectional drawing which shows the whole structure of the in-mold observation apparatus which is one Embodiment of this invention, and the principal part structure of the metal mold | die to which this in-mold observation apparatus is applied. FIG. 2 is an enlarged cross-sectional view showing a main part of the in-mold observation apparatus shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mold 2 Fixed mold 2a Fixed mold through-hole 3 Movable mold 4 Cavity 10 In-mold observation apparatus 11, 12 Transparent body 13 Light source 16 High-speed camera (imaging means)
17 Red transparent plate 18 Polarizing plate

Claims (6)

  Illumination light enters the cavity of the injection foam molding mold through a transparent body incorporated in the mold, and the transmitted light is received by the imaging means through another transparent body incorporated in the mold. In the in-mold observation method for observing the foaming behavior of the resin material, the illumination light is incident on the cavity through a red transparent plate.   Illumination light enters the cavity of the injection foam molding mold through a transparent body incorporated in the mold, and the transmitted light is received by the imaging means through another transparent body incorporated in the mold. An in-mold observation method for observing the foaming behavior of a resin material, wherein the transmitted light of the illumination light is received by a camera through a polarizing plate.   Illumination light enters the cavity of the injection foam molding mold through a transparent body incorporated in the mold, and the transmitted light is received by the imaging means through another transparent body incorporated in the mold. In the in-mold observation method for observing the foaming behavior of the resin material, the illumination light is incident on the cavity through a red transparent plate, and the transmitted light of the illumination light is received by a camera through a polarizing plate. In-mold observation method.   A pair of transparent bodies are incorporated into an injection foam molding die so as to face each other with a cavity interposed therebetween, and illumination light emitted from a light source is incident on the cavity through one of the transparent bodies, and the transmitted light is transmitted to the other An in-mold observation apparatus for receiving light with an imaging means through a transparent body, wherein a red transparent plate is disposed between the light source and the one transparent body.   A pair of transparent bodies are incorporated into an injection foam molding die so as to face each other with a cavity interposed therebetween, and illumination light emitted from a light source is incident on the cavity through one of the transparent bodies, and the transmitted light is transmitted to the other An in-mold observation apparatus for receiving light with an imaging means through a transparent body, wherein a polarizing plate is disposed between the other transparent body and the camera.   A pair of transparent bodies are incorporated into an injection foam molding die so as to face each other with a cavity interposed therebetween, and illumination light emitted from a light source is incident on the cavity through one of the transparent bodies, and the transmitted light is transmitted to the other In an in-mold observation apparatus that receives light with an imaging means through a transparent body, a red transparent plate is disposed between the light source and the one transparent body, and polarized light is provided between the other transparent body and the camera. An in-mold observation apparatus characterized in that a plate is provided.

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