JP4271221B2 - Drainage basin and molding method thereof - Google Patents

Description

  The present invention relates to a drainage basin and a molding method thereof, and more particularly to a drainage basin having improved impact resistance, in particular, impact resistance of a bottom portion, and a molding method thereof.

  Conventionally, synthetic resin, for example, polyvinyl chloride drainage basin has been used as drainage basin, but the bottom part (inverted part) of drainage basin is drained from the top, tools dropped during construction, when opening the lid There is a risk of damage from falling stones.

  For this reason, only the bottom part of the drainage basin is formed and fitted with another member having impact resistance, but it takes time for molding and increases the cost. Further, the entire drainage can be formed of a material having impact resistance, for example, a resin raw material to which a modifier is added, but the cost of the resin raw material is significantly increased.

  Accordingly, an object of the present invention is to provide a drainage basin using a three-layered resin molded product that can effectively improve the impact resistance of the bottom of the drainage basin and a molding method therefor.

  In order to achieve the above-mentioned object, the drainage basin of the present invention is a drainage basin in which the upper part of a cylindrical basin body is open and a drainage pipe connecting portion is formed on the side wall of the basin body. Is formed in a three-layer structure having an intermediate layer and an inner layer and an outer layer covering the inner and outer surfaces of the intermediate layer, the intermediate layer is formed of a resin raw material containing a modifier, and the inner layer and the outer layer are It is characterized in that it is formed of an unused resin raw material that does not contain a modifier, and as a first configuration, an inner layer and an outer layer that cover the bottom of the bag main body with the intermediate layer and the inner and outer surfaces of the intermediate layer Are formed by injection molding, the intermediate layer is formed of a resin raw material containing a modifier, and the inner layer and the outer layer are made of an unused resin raw material not containing the modifier. In particular, the intermediate layer The mixing ratio of the modifying agent of the formed resin in the raw material, is characterized in that 8-15 parts by weight per 100 parts by weight of the resin material of the unused containing no modifier.

Further, as a second configuration, in a drainage basin in which an upper portion of a cylindrical ridge body is opened and a drain pipe connecting portion is formed on a side wall of the basin body, the entire basin body is composed of an intermediate layer and the intermediate layer. A three-layer structure having an inner layer and an outer layer covering the inner and outer surfaces of the resin is formed by injection molding, the intermediate layer is formed of a resin raw material containing a modifier , and the inner layer and the outer layer are formed of the modifier . It is characterized by being formed from an unused resin raw material not contained.

  Furthermore, the drainage tub forming method of the present invention has, as a first configuration, an upper portion of a cylindrical ridge body that is open, an invert portion at a lower portion of the ridge body, and an invert portion that communicates with the invert portion. In a drainage tub molding method in which a drain pipe connecting portion is formed on the side wall of the basin, an inner mold and an outer mold are clamped to form a molding cavity of the bowl body, and an inverted portion of the bowl body in the molding cavity A predetermined amount of unused resin raw material is injected into the molding cavity from the gate formed in the portion corresponding to the lower surface, and then the resin raw material containing the modifier is injected into the molding cavity, thereby modifying the modifier. Forming an intermediate layer made of a resin material to be contained in the bottom of the bag body and covering the inner and outer surfaces of the intermediate layer with an inner layer and an outer layer made of an unused resin material not containing a modifier. It is a feature.

  In addition, as a second configuration of the method for forming a drainage basin according to the present invention, an upper portion of a cylindrical basin body is opened, an invert portion is provided at a lower portion of the basin body, and the basin body communicates with the invert portion. In a method for forming a drainage basin in which a drain pipe connecting portion is formed on a side wall, an inner mold and an outer mold are clamped to form a molding cavity of the heel body, and the bottom surface of the inverted portion of the heel body in the molding cavity A predetermined amount of unused resin raw material is injected into the molding cavity from the gate formed in the portion corresponding to the above, and then the modifier is contained by injecting the resin raw material containing the modifier into the molding cavity. Forming an intermediate layer made of a resin raw material over the entire main body of the bag, and covering the inner and outer surfaces of the intermediate layer with an inner layer and an outer layer made of an unused resin raw material containing no modifier. It is said.

  According to the present invention, the resin material containing a modifier is used for the intermediate layer of the three-layer structure to improve the impact resistance of the drainage bottom (inverted part). The required impact resistance can be obtained at a lower cost compared to the case where a modifier is added. Moreover, a lid having a three-layer structure with a good appearance can be obtained without causing the resin material of the intermediate layer containing the modifier to protrude from the inner layer or the outer layer.

  FIG. 1 is a sectional view of a drainage basin showing an embodiment of the present invention, and FIG. 2 is a sectional view showing a manufacturing process of the drainage basin shown in FIG. The drainage basin is open at the top of the cylindrical casket body 11, has an invert portion 12 at the lower portion of the basin body 11, and communicates with the invert portion 12 to connect the drain pipe to the side wall of the basin body 11. 13a and 13b are formed, and the intermediate layer A of the bag body 11 is formed of a resin raw material containing a modifier, and the inner and outer surfaces of the intermediate layer A are unused and do not contain a modifier. It is covered with an inner layer B and an outer layer C made of a resin raw material.

  The impact modifier used for the intermediate layer A can be an appropriate one depending on the type of resin, and the amount of mixing should also be set appropriately according to the type of resin and the degree of modification. Can do. Rubber modifiers such as MBS resin can be used as the modifier, and tin additives, heat stabilizers, lubricants, processing aids, pigments, plasticizers, fillers, electric resistances can be used as other additives. Various additives such as an inhibitor, an ultraviolet absorber, and a flame retardant can be added.

  As a suitable blending example, 8 to 15 parts by weight of a modifier, 0.5 to 3 parts by weight of a stabilizer, 0.1 to 1.0 part by weight of a lubricant, and a processing aid 0 with respect to 100 parts by weight of polyvinyl chloride. 0.1 to 1.0 part by weight and 0.1 to 1.0 part by weight of pigment.

  Further, as the resin raw material constituting the inner layer B and the outer layer C, an unused resin raw material such as polyvinyl chloride, polyethylene, or polypropylene which is compatible with the intermediate layer A and does not contain a modifier. Can be used.

  As described above, various resin raw materials can be used as the intermediate layer A, and the inner layer B and the outer layer C that cover the inner and outer surfaces of the intermediate layer A. However, pipes made of hard vinyl chloride resin are frequently used as drain pipes connected to the drains. In consideration of this, a hard vinyl chloride resin can be suitably used for the intermediate layer A, the inner layer B, and the outer layer C.

  The drainage basin is manufactured by injection molding, and this manufacturing process will be described next. In FIG. 2, reference numerals 51, 52, and 53 are inner dies, and 61 and 62 are outer dies. The inner cavity and the outer mold are clamped to form a molding cavity of the bag main body 11. . A gate 62G for injecting a resin raw material into the molding cavity is provided in the outer mold 62, and is provided at a portion corresponding to the lower surface of the inverted portion of the bag main body 11. When the gate 62G is provided on the bottom surface of the invert part that is symmetrical and near the center of the cylindrical bowl body 11 as described above, the resin raw material injected into the molding cavity can be evenly distributed to the end part. Even if the mark of 62G (the gate opening 62M (see FIG. 1)) appears on the lower surface of the invert part, there is an advantage in appearance that it is not touched by human eyes.

  A nozzle 71 of an injection molding machine can be brought into contact with the gate 62G, and an unused resin raw material not containing a modifier is injected from a first resin flow path 72 provided in the nozzle 71, A resin material containing a modifier is injected from the second resin flow path 73. In the injection molding operation, after the inner mold and the outer mold are clamped to form a molding cavity, first, a predetermined amount of unused resin raw material not containing a modifier is supplied from the first resin flow path 72. Eject. Next, a resin raw material containing a modifier for improving impact resistance is injected from the second resin flow path 73 into the molding cavity, and the cavity is almost filled with the resin raw material.

  At this time, the resin raw material containing the modifier injected later into the unused resin raw material previously injected into the molding cavity, and both the resin raw materials spread evenly to the end of the cavity. That is, since the surface of the resin raw material containing the modifier that becomes the intermediate layer A is covered with the skin layers (inner layer B and outer layer C) evenly to the end of the cavity, the inner layer B and the outer layer C are separated from the intermediate layer. A does not protrude. In addition, the ratio of the unused resin raw material which does not contain the modifier to be injected first and the resin raw material containing the modifier to be injected thereafter is the thickness of the intermediate layer A, the inner layer B and the outer layer C, the resin It can be appropriately set in consideration of the type of raw material.

  Finally, a small amount of unused resin raw material containing no modifier is injected from the first resin flow path 72 into the molding cavity. As a result, the gate port portion 62M corresponding to the gate 62G can be covered with the resin raw material not containing the modifier, and the staying resin at the tip portion of the nozzle 71 is not containing the modifier for the next shot. The resin raw material used can be replaced. When the inner mold and the outer mold are opened through the molding steps described above, a drainage tub with a good appearance can be obtained as shown in FIG.

It is sectional drawing of the drainage basin which shows one example of this invention. It is sectional drawing which shows the manufacturing process of a drain.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Main body, 12 ... Invert part, 13a, 13b ... Connection part, 51, 52, 53 ... Inner metal mold, 61, 62 ... Outer metal mold, 62G ... Gate, 62M ... Gate mouth part, 71 ... Nozzle, 72 ... 1st resin flow path, 73 ... 2nd resin flow path, A ... Intermediate layer, B ... Inner layer, C ... Outer layer

Claims (5)

In a drainage basin in which the upper side of a cylindrical ridge body is open and a drain pipe connection portion is formed on a side wall of the ridge body, an inner layer and an outer layer that cover an intermediate layer and an inner layer and an outer surface of the intermediate layer at the bottom of the jar body Are formed by injection molding, the intermediate layer is formed of a resin raw material containing a modifier, and the inner layer and the outer layer are made of an unused resin raw material not containing the modifier. A drainage basin characterized by formation. The mixing ratio of the modifier in the resin raw material forming the intermediate layer is 8 to 15 parts by weight with respect to 100 parts by weight of the unused resin raw material not containing the modifier. The drainage tank described. In a drainage basin in which the upper part of a cylindrical ridge body is open and a drain pipe connecting portion is formed on a side wall of the ridge body, the entire basin body covers an intermediate layer and inner and outer layers of the intermediate layer. And the intermediate layer is formed of a resin raw material containing a modifier , and the inner layer and the outer layer are formed of an unused resin raw material not containing the modifier. Drainage basin characterized by formation. In a method for forming a drainage basin in which the upper part of the cylindrical bowl body has an opening, an invert part is formed in the lower part of the bowl body, and a drain pipe connecting part is formed on the side wall of the bowl body in communication with the invert part The inner mold and the outer mold are clamped to form a molding cavity of the bowl body, and an unused resin in the molding cavity is formed from a gate formed in a portion corresponding to the bottom surface of the inverted portion of the bowl body in the molding cavity. By injecting a predetermined amount of the raw material, and then injecting a resin raw material containing the modifier into the molding cavity, an intermediate layer made of the resin raw material containing the modifier is formed at the bottom of the bag body. A method for forming a drainage basin, wherein the inner and outer surfaces of the intermediate layer are covered with an inner layer and an outer layer made of an unused resin raw material containing no modifier. In a method for forming a drainage basin in which an upper portion of a cylindrical jar body has an opening, an invert portion is formed in a lower portion of the jar body, and a drain pipe connecting portion is formed on a side wall of the jar body in communication with the invert portion. The inner mold and the outer mold are clamped to form a molding cavity of the bowl body, and an unused resin in the molding cavity is formed from a gate formed in a portion corresponding to the bottom surface of the inverted portion of the bowl body in the molding cavity. By injecting a predetermined amount of the raw material, and then injecting a resin raw material containing the modifier into the molding cavity, an intermediate layer made of the resin raw material containing the modifier is formed over the entire bag body. A method for forming a drainage basin, wherein the inner and outer surfaces of the intermediate layer are covered with an inner layer and an outer layer made of an unused resin raw material containing no modifier.

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