JP2017214071A - Shielding resin tank and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To block an inside from light to protect liquid from ultraviolet ray and the like without impairing visibility of a liquid surface of the liquid in a light-blocking resin tank.SOLUTION: There is provided a light-blocking resin tank 1 for storing liquid (vehicular coolant) requiring light-blocking. The light-blocking resin tank 1 has a two-layer structure where an outer layer 2 formed of a light-blocking resin material and an inner layer 3 formed of a light transmissive resin material are integrally welded to each other and is formed with a slit 4 extending in a height direction in part of the outer layer 2 to expose the inner layer 3 to the outside.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a light shielding resin tank and a method for manufacturing the same.

  Conventionally, milky white polypropylene resin is used for header tanks and reservoir tanks for storing automotive coolant, and according to such header tanks and reservoir tanks using milky white polypropylene resin, cooling is performed. The liquid can be securely held without leaking, can easily withstand the pressure caused by overheating, and can be molded into a free shape, and the liquid level can be easily seen. The merit is obtained.

  Although there is no prior art document information directly related to the present invention described later, there is the following Patent Document 1 or the like as prior art document information related to a general automotive coolant tank. Yes.

JP 2014-66250 A

  However, header tanks and reservoir tanks made of milky white polypropylene resin have the merit that the liquid level of the cooling liquid can be easily visually recognized due to its translucency, but the additives in the cooling liquid are affected by the influence of ultraviolet rays. There was a problem that it settled and looked bad.

  The present invention has been made in view of the above circumstances, and provides a light-blocking resin tank capable of protecting the liquid material from ultraviolet rays and the like by shielding the inside without impairing the visibility of the liquid surface of the liquid material, and a method for manufacturing the same. The purpose is to do.

  The present invention is a light shielding resin tank for storing a liquid material requiring light shielding, and has a two-layer structure in which an outer layer made of a light shielding resin material and an inner layer made of a light transmitting resin material are integrally welded. And a slit extending in the height direction to expose the inner layer is formed in a part of the outer layer.

  Thus, since the inside is shielded from light by the outer layer made of the light-shielding resin material, the liquid material stored therein can be protected from ultraviolet rays and the like, and the translucent resin is used. Since the inner layer made of the material is partially exposed from the slit of the outer layer, it is possible to visually recognize the liquid level of the liquid material through the slit through the inner layer.

  In the present invention, the liquid material to be stored is intended for automotive coolant, and the inner layer made of a light-transmitting resin material preferably contains an ultraviolet absorber. Even in the inner layer exposed from the slits, it is possible to absorb ultraviolet rays by the ultraviolet absorber and reduce transmission to the inside.

  In other words, in automotive coolants, additives in the coolant may precipitate due to the influence of ultraviolet rays, but the inner layer that is shielded from most of the surface by the outer layer and partially exposed from the slits also absorbs ultraviolet rays. If the agent prevents the transmission of ultraviolet rays, precipitation of the additive in the cooling liquid is remarkably suppressed.

  Furthermore, when the light-shielding resin tank of the present invention is specifically manufactured, a molding machine having a double discharge port composed of a C-shaped outer peripheral port and an O-shaped inner peripheral port is used. A light-shielding molten resin is discharged so as to form a cylinder with a C-shaped cross section, and a translucent molten resin is discharged from the inner peripheral port so as to form a cylinder with an O-shaped cross section to form a two-layer parison Extending downward, sandwiching the parison from both sides with molds and introducing compressed air into the interior to inflate it and press it against the inner wall of the mold. In this way, it is possible to easily manufacture by using the existing multilayer blow molding method with a slight modification to the discharge port of the molding machine.

  According to the above-described light shielding resin tank of the present invention and the method for producing the same, various excellent effects as described below can be obtained.

  (I) According to the invention described in claim 1 of the present invention, the liquid level of the liquid material can be visually recognized through the inner layer through the slit while shielding the inside with the outer layer made of the light-shielding resin material. The liquid material can be protected from ultraviolet rays and the like by shielding the inside without impairing the visibility of the liquid level of the liquid material. For example, when the liquid material is a cooling liquid for automobiles, It can suppress that the additive in a cooling liquid precipitates, and can aim at the significant improvement of appearance.

  (II) According to the invention described in claim 2 of the present invention, if most of the surface is shielded by the outer layer and the inner layer partially exposed from the slit is blocked by the ultraviolet absorber, the ultraviolet ray is blocked. It can suppress more reliably that the additive in a cooling fluid will precipitate by the influence of (2).

  (III) According to the invention described in claim 3 of the present invention, the light-shielding resin tank according to claims 1 and 2 can be simplified by an existing multi-layer blow molding method only by slightly modifying the discharge port of the molding machine. Can be manufactured.

It is a perspective view which shows an example of the form which implements this invention. It is a cross-sectional view of the light shielding resin tank of FIG. It is explanatory drawing of the 1st process regarding the manufacturing method of the light shielding resin tank of FIG. FIG. 4 is an arrow view in the IV-IV direction of FIG. 3. It is explanatory drawing of the 2nd process regarding the manufacturing method of the light shielding resin tank of FIG. It is explanatory drawing of the 3rd process regarding the manufacturing method of the light shielding resin tank of FIG. It is explanatory drawing of the 4th process regarding the manufacturing method of the light shielding resin tank of FIG.

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

  1 to 7 show an example of an embodiment for carrying out the present invention. In FIG. 1, reference numeral 1 denotes a light shielding resin tank for storing a liquid material that needs to be shielded from light, and in the example shown here, it is stored. The case where the coolant for motor vehicles is made into object as a liquid material which should be illustrated is illustrated.

  As shown in FIGS. 1 and 2, the light shielding resin tank 1 has a two-layer structure in which an outer layer 2 made of a light shielding resin material and an inner layer 3 made of a light transmitting resin material are integrally welded. A slit 4 is formed in a part of the outer layer 2 so as to extend in the height direction and expose the inner layer 3.

  Here, the light-shielding resin material forming the outer layer 2 may be a resin agent added with a light-shielding pigment such as carbon black, and the light-transmitting resin material forming the inner layer 3 is conventionally used. What is necessary is just to use what added about 0.5 to 2% of ultraviolet absorbers, such as Tinuvin (trademark), to the milky white resin agent currently used.

  Further, when specifically manufacturing the light shielding resin tank 1 having such a structure, it can be easily manufactured by using an existing multilayer blow molding method. As shown in FIGS. It is preferable to use a molding machine 8 having a double discharge port 7 composed of an outer peripheral port 5 (see FIG. 4) and an O-shaped inner peripheral port 6 (see FIG. 4).

  The molding machine 8 is provided with an extruder 9 for extruding and supplying a light-shielding molten resin, and an extruder 10 for extruding and supplying a translucent molten resin. Is supplied to the C-shaped outer peripheral port 5, and the molten resin from the extruder 10 is supplied to the O-shaped inner peripheral port 6.

  Thus, the molding machine 8 is used to discharge the light-shielding molten resin from the outer peripheral port 5 so as to form a cylinder having a C-shaped cross section, and from the inner peripheral port 6 to transmit the light-transmitting molten resin. When discharged so as to form a cylindrical shape having an O-shaped cross section, the two-layer parison 11 extends downward and hangs down between the molds 12 and 13 (see the first step in FIG. 3).

  Next, the molds 12 and 13 are closed and the parison 11 is sandwiched (see the second step in FIG. 5), and the parison 11 is inflated by introducing compressed air A into the inner walls of the molds 12 and 13. Pressing (see the third step in FIG. 6), thereby adding a tank shape and cooling and solidifying, the molds 12 and 13 are opened, and the light shielding resin tank 1 is taken out (see the fourth step in FIG. 7).

  According to the light-shielding resin tank 1 manufactured in this way, the inside is shielded by the outer layer 2 made of the light-shielding resin material, so that the coolant stored therein can be protected from ultraviolet rays and the like. Moreover, since the inner layer 3 made of a translucent resin material is partially exposed from the slit 4 of the outer layer 2, it is possible to visually recognize the liquid level of the coolant through the inner layer 3 from the slit 4 as before. Become.

  Therefore, according to the above-described embodiment, the liquid level of the cooling liquid can be visually recognized through the inner layer 3 through the slit 4 while shielding the inside by the outer layer 2 made of the light-shielding resin material. The inside of the cooling liquid can be protected from ultraviolet rays and the like by shielding the inside without impairing the visibility of the surface, and the appearance of the additive is suppressed by preventing the additives in the cooling liquid from being precipitated due to the influence of ultraviolet rays. Improvements can be made.

  Particularly in this embodiment, the inner layer 3 which is mostly shielded from light by the outer layer 2 and partially exposed from the slit 4 is also prevented from transmitting ultraviolet light by the ultraviolet absorber. It can suppress more reliably that the additive in it will precipitate.

  In addition, the light shielding resin tank and the manufacturing method thereof according to the present invention are not limited to the above-described embodiments, and may be various liquid materials that require light shielding other than automotive coolant. Of course, various modifications can be made without departing from the scope of the invention.

DESCRIPTION OF SYMBOLS 1 Light-shielding resin tank 2 Outer layer 3 Inner layer 4 Slit 5 Outer peripheral port 6 Inner peripheral port 7 Discharge port 8 Molding machine 11 Parison 12 Mold 13 Mold A Compressed air

Claims (3)

  A light shielding resin tank for storing a liquid material that needs to be shielded from light, and has a two-layer structure in which an outer layer made of a light shielding resin material and an inner layer made of a light transmissive resin material are integrally welded, A light-shielding resin tank, wherein a slit is formed in a part of an outer layer so as to extend in a height direction and expose the inner layer.   The light shielding resin tank according to claim 1, wherein the liquid material to be stored is an automotive coolant and the inner layer made of a translucent resin material contains an ultraviolet absorber.   A method for manufacturing a light-shielding resin tank for storing a liquid material that needs to be shielded from light, using a molding machine that has a double discharge port composed of a C-shaped outer peripheral port and an O-shaped inner peripheral port facing downward, Two layers are formed by discharging a light-blocking molten resin from the outer peripheral port so as to form a cylinder with a C-shaped cross section, and discharging a translucent molten resin from the inner peripheral port so as to form a cylinder having an O-shaped cross section. The parison is extended downward, sandwiched between the molds from both sides, and inflated by introducing compressed air into the interior and pressed against the inner wall of the mold, thereby adding a tank shape and cooling and solidifying the mold A method for producing a light-shielding resin tank, which is opened and taken out.

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