JP4221439B2 - Molding method of drainage - Google Patents

Description

  The present invention relates to a method for forming a drainage basin, and more particularly, to a method for molding a drainage basin that can improve impact resistance, particularly impact resistance of a bottom portion, and can effectively use resin scrap and used waste materials.

  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.

  On the other hand, when injection molding of housing materials such as household electrical appliances made of resin raw materials and pipe fittings, unnecessary parts such as gates and scrap are generated, or when plastic resin pipes are continuously extruded, molding A large amount of scrap may be generated in the initial stage until the conditions stabilize. In addition, when a synthetic resin pipe that has been aged after its useful life has been renewed, a large amount of used waste material may be generated. In recent years, disposal of such resin scraps and used waste materials has become a major problem.

Conventionally, resin scraps and used waste materials have been disposed of by incineration or landfill. However, when resin scraps are incinerated, there is a problem that dioxins are generated and the environment is polluted. Yes. In addition, when resin scraps and waste materials are buried in the ground, the place of filling becomes a problem, as well as the synthetic resin is not decomposed and corroded over a long period of time. Has reached. Therefore, it has been proposed to grind resin scraps and used waste materials and use them as recycled raw materials (see, for example, Patent Document 1), but the response is not sufficient. there were.
JP 2001-41362 A

  Therefore, the present invention can effectively improve the impact resistance of the bottom of the drainage basin, and effectively utilize scrap generated when the resin molded product is injection molded or extruded, and used waste materials. It is an object of the present invention to provide a method for forming a drainage basin using a three-layered resin molded product that can be used.

  In order to achieve the above object, a first method for forming a drainage basin according to the present invention is such that an upper portion of a cylindrical basin body is open, an invert portion is provided at a lower portion of the basin body, and communicated with the invert portion In a drainage tub molding method in which a drain pipe connection part is formed on the side wall of the jar body, an inner mold and an outer mold are clamped to form a molding cavity of the jar body, A predetermined amount of unused resin raw material is injected into the molding cavity from the gate formed at the portion corresponding to the bottom surface of the invert part, and then the resin raw material containing recycled raw material obtained by crushing resin scrap and waste material is formed in the molding cavity. The intermediate body made of the resin raw material containing the modifier at the bottom of the main body is removed from the bottom of the main body by injecting a predetermined amount into the molding cavity and subsequently injecting the resin raw material containing the modifier into the molding cavity. To the whole An intermediate layer made of a resin raw material containing the regenerated raw material is formed, and the inner and outer surfaces of both intermediate layers are covered with an inner layer and an outer layer made of an unused resin raw material not containing the modifier and the reclaimed raw material. It is characterized by that.

  Further, the second method for forming the drainage basin of the present invention is such that an upper portion of the cylindrical basin body is open, an invert portion is provided at the lower portion of the basin body, and communicates with the invert portion on the side wall of the basin body. In the method for forming a drainage basin in which a drain pipe connecting portion is formed, the inner mold and the outer mold are clamped to form a molding cavity of the ridge body, which corresponds to the bottom surface of the inverted portion of the ridge body in the molding cavity A predetermined amount of unused resin raw material is injected into the molding cavity from the gate formed at the site to be injected, and then a predetermined amount of resin raw material containing recycled raw material obtained by crushing resin scrap and waste material is injected into the molding cavity. Then, by injecting the resin raw material containing the modifier and the regenerated raw material into the molding cavity, the intermediate layer made of the resin raw material containing the modifier at the bottom of the bag main body is removed from the entire bag main body excluding the bottom. Said re An intermediate layer made of a resin raw material containing raw materials is formed, and the inner and outer surfaces of both intermediate layers are covered with an inner layer and an outer layer made of unused resin raw material not containing a modifier and a regenerated raw material. It is a feature.

  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. Furthermore, by including a recycled raw material in the intermediate layer, it is possible to effectively utilize scrap generated when a resin molded product is injection-molded or extruded, and waste materials that have become obsolete and used. Further, 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 and the regenerated material to protrude from the inner layer and 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, 13b is formed, and the intermediate layer A of the main body 11 is formed of a resin raw material containing a regenerated raw material and a modifier obtained by pulverizing scraps and waste materials of resin molded products, The inner and outer surfaces of the intermediate layer A are covered with an inner layer B and an outer layer C made of an unused resin raw material containing no regeneration raw material and modifier.

  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.

  Recycled raw materials obtained by pulverizing resin scraps and waste materials are resin molded products made of polyvinyl chloride, polyethylene, polypropylene, etc., such as plastic bottles, waste materials for building materials such as housings and fittings for home appliances, and injection. It is obtained by crushing unnecessary members such as gates and scrap generated during molding. As the main component of the resin raw material constituting the intermediate layer A, it is possible to use only the recycled raw material or a mixture of this recycled raw material with an unused resin raw material, and the resin constituting the inner layer B and the outer layer C. As the raw material, an unused resin raw material such as polyvinyl chloride, polyethylene or polypropylene which is a resin raw material compatible with the intermediate layer A and does not contain a regenerating raw material or 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 covering the inner and outer surfaces of the intermediate layer A, but a large amount of used waste materials and scraps made of vinyl chloride resin are generated. Considering the current situation and the fact that pipes made of hard vinyl chloride resin are frequently used as drain pipes connected to drainage basins, recycled raw materials made of hard vinyl chloride resin can be suitably used for the intermediate layer A. For the inner layer B and the outer layer C covering the inner and outer surfaces of A, an unused hard vinyl chloride resin containing no reclaimed raw material can be suitably used.

  Moreover, it is preferable that the ratio of the said reproduction | regeneration raw material to the whole resin raw material which comprises a drainage tank shall be 10 to 80 weight%. If the ratio of the recycled material is less than 10% by weight, a sufficient effect cannot be expected in terms of effectively using waste materials and scrap. Conversely, if the ratio exceeds 80% by weight, the recycled material is made of a resin material that does not contain the recycled material. Since the inner layer B and the outer layer C are thin, a situation occurs in which the recycled raw material constituting the intermediate layer A partially protrudes from the inner layer B and the outer layer C and impairs the appearance. Incidentally, the thickness of the side wall portion of the drainage basin of size 150 to 350 is about 5 to 20 mm.

  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 regenerated raw material or a modifier is supplied from a first resin flow path 72 provided in the nozzle 71. The resin raw material containing the recycled raw material and the 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, an unused resin raw material containing no regenerated raw material or modifier from the first resin flow path 72 is used. A predetermined amount is injected. Next, a recycled raw material obtained by crushing resin scrap and waste material and a resin raw material containing a modifier for improving impact resistance are injected into the molding cavity from the second resin flow path 73, and the inside of the cavity is injected. It is almost filled with resin raw materials.

  At this time, the resin material containing the regenerated material and the modifier injected later into the unused resin material previously injected into the molding cavity, and both resin materials spread evenly to the end of the cavity. . That is, the inner layer B and the outer layer C are uniformly distributed to the end of the cavity in a state where the surface of the resin raw material containing the regeneration raw material and the modifying agent to be the intermediate layer A is covered with the skin layers (the inner layer B and the outer layer C). The intermediate layer A does not protrude from the surface. In addition, the ratio of the raw material raw material which does not contain the reproduction | regeneration raw material and modifier which are injected first, and the resin raw material which contains the reproduction | regeneration raw material and modifier which inject after that is the intermediate | middle layer A, the inner layer B, and the outer layer C The thickness can be appropriately set in consideration of the thickness of the resin, the type of resin raw material, and the like.

  Finally, a small amount of unused resin material containing no regenerated material and modifier is injected into the molding cavity from the first resin flow path 72. As a result, the gate port portion 62M corresponding to the gate 62G can be covered with the resin material not containing the regenerated material and the modifier, and the staying resin at the tip of the nozzle 71 is regenerated and modified for the next shot. It can be replaced with an unused resin raw material containing no quality agent. 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.

  In the above description, the resin raw material containing both the modifier and the regenerated raw material is used as the entire intermediate layer of the resin drainage basin, but only the modifying agent is contained without using the regenerated raw material. Thus, the impact resistance of the whole drainage can be improved, and scrap and waste materials can be effectively used by including only recycled raw materials without using a modifier. By including both the modifier and the recycled material, impact resistance can be improved and scrap and waste materials can be effectively used.

  Furthermore, in the manufacturing process, after injecting an unused resin raw material containing no recycled raw material from the first resin flow path 72, the resin raw material injected into the molding cavity from the second resin flow path 73 is first modified. By injecting the resin raw material containing the regenerated raw material without containing the agent, and subsequently injecting the resin raw material containing the modifier or the resin raw material containing both the modifier and the regenerated raw material, The bottom portion of the invert portion 12, that is, the intermediate layer A of the invert portion 12 has excellent impact resistance made of a resin raw material containing a modifier, and the other portion of the drainage basin is regenerated without containing the modifier. It can be set as the intermediate | middle layer A which consists of a resin raw material containing the raw material.

  At this time, the injection amount of the resin raw material containing the regenerated raw material first injected from the second resin flow path 73 is set to an amount that fills 70 to 80% of the cavity by the injection of the resin raw material, and then the reforming to be injected By setting so that the cavity is filled with the resin raw material containing the agent, the impact resistance of the intermediate layer A of the invert portion 12 in the normal drainage can be improved by the modifier. As a result, it is possible to effectively use the recycled raw material while minimizing the amount of the modifier used and improving the impact resistance of the necessary portion.

It is sectional drawing which shows one example of the drainage drainage shape | molded with the shaping | molding method 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 (2)

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 at a portion corresponding to the bottom surface of the inverted part of the bowl body in the molding cavity. A predetermined amount of the raw material is injected, and then a predetermined amount of the resin raw material containing the recycled raw material obtained by crushing the resin scrap and waste material is injected into the molding cavity, and then the resin raw material containing the modifier is injected into the molding cavity. The intermediate layer made of a resin raw material containing a modifier is formed at the bottom of the cocoon body, and the intermediate layer made of the resin raw material containing the regenerated raw material is formed on the entire 枡 body excluding the bottom. Molding method of catch basins, characterized by a state in which the inner and outer surfaces of both the intermediate layer is covered with the inner layer and the outer layer of virgin resin material containing no modifier and regrind Te. 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 at a portion corresponding to the bottom surface of the inverted part of the bowl body in the molding cavity. A predetermined amount of the raw material is injected, and then a predetermined amount of the resin raw material containing the recycled raw material obtained by pulverizing the resin scrap and waste material is injected into the molding cavity, followed by the resin raw material containing the modifier and the recycled raw material. By injecting into the molding cavity, an intermediate layer made of a resin raw material containing a modifier is formed at the bottom of the coffin main body, and an intermediate layer made of a resin raw material containing the recycled raw material is formed on the entire coffin main body excluding the bottom. Molding method of catch basins, characterized by a state in which the inner and outer surfaces covered with an inner and outer layer of virgin resin material containing no modifier and reproduction material of respectively formed by both the intermediate layer.

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