JP2020138401A - Method for manufacturing hollow molded article - Google Patents

Abstract

To provide a method that gives a functional specified shape simultaneously with a uniting of divided molded articles, instead of a troublesome method of assembling separately manufactured constituent members, in a method of manufacturing a hollow molded article in which end-edge portions of plastic divided molded articles divided into a plurality of pieces are joined and united.SOLUTION: A method for manufacturing a hollow molded article melts and disposes a sealing resin to an end-edge temporarily joined portion of a preparatory united article formed by temporarily joining each end-edge portion of a plastic divided molded article divided into a plurality of pieces and molded, and solidifies the sealing resin to permanently join the end-edge temporarily joined portion, and melts and injects the sealing resin into a gap formed by temporarily joining, mutually, a part of divided shape portions formed in a portion other than each end-edge portion of the divided molded article and solidifies the sealing resin, and permanently joins the temporarily joined divided shape portion to form a specified shape portion in a portion other than the end-edge portion.SELECTED DRAWING: Figure 2

Description

The present invention relates to a method for producing a hollow molded product, and more particularly to a method for producing a hollow molded product in which plastic divided molded products formed by being divided into a plurality of parts are joined and united.

Hollow molded products made of plastic are often created by blow molding, but molded products with a shape on the inner surface of the hollow cannot be created by blow molding, and the edge of the split molded product molded by injection molding etc. In addition to the method of butt-butting and temporarily joining, melting and fusing the temporary joining part, or welding with a welding rod, the method of spray-arranging the melted sealing resin on the temporary joining part and solidifying it to join is performed. However, a die slide injection (DSI) method or the like using a mold used for molding a split molded product has been developed (see, for example, Patent Document 1).

Then, as a method of sealing and joining the temporary joints by spraying and arranging the molten sealing resin on the temporary joints where the edge portions of the divided molded products are butted and solidifying the resin, each of the divided molded products is joined. A method in which a convex portion is provided on the edge portion of the surface to form a butt temporary joint portion, and the convex portion formed in the temporary joint portion is embedded with a sealing resin and sealed (see Patent Document 2). A method of filling and sealing a sealing resin in a hollow internal passage formed at an edge portion (see Patent Document 3) has been proposed. Further, when joining a hollow molded product that requires shape accuracy, the joint portion is heated by the molten sealing resin and this portion is deformed, so that the dimensional accuracy of the hollow molded product is not impaired. A middle plate having a special structure is placed inside the two divided molded products to perform temporary joining, and the molten sealing resin is passed through the sealing resin injection path provided inside the middle plate. A method of spray-arranging the temporary joint portion to solidify and join the joint has also been proposed (Patent Document 4).

In these methods, a hollow molded product can be produced by efficiently sealing and joining a temporary joint portion in which the edge portions of the divided molded product divided into a plurality of parts are butted to form an edge joint portion. A hollow molded product having a specific shape portion in a portion other than the peripheral joint portion can also be created, but the portion other than the edge joint portion has a function only by sealing and joining the temporary joint portion of the edge portion. It was not possible to add the specific shape portion to the hollow molded product, and it was necessary to separately assemble the constituent members of the specific shape portion having a function. Since this assembly is performed by welding, gluing, mounting brackets, etc. of the constituent members, the manufacturing process is time-consuming.

A hollow molded product having a specific shape portion added to a portion other than the edge joint as described above is, for example, a hollow molded product made of plastic instead of metal as an intake / exhaust duct attached to an air conditioner or the like. However, in duct-shaped hollow molded products made of plastic, the duct wall resonates and generates noise during intake and exhaust due to its low rigidity, so ribs are provided inside as a specific shape part. It is necessary to prevent the occurrence of resonance. In addition, as a small amount of wastewater treatment device discharged from a laboratory or a laboratory, a hollow molded product in which a wastewater treatment path filled with various treatment materials having a wastewater treatment function is provided as a specific shape portion is used. Often. In this case, it is necessary to form a wastewater receiving tank and a wastewater treatment path following it as a specific shape portion inside the molded product, and hold the wastewater in this treatment path for a certain period of time in order to treat the wastewater. In addition, there are many hollow molded products for which it is necessary to impart such a specific shape portion configuration, and it is desired to impart these specific shape portions by a simple method that does not require time and effort in the production process. ..

On the other hand, in the method shown in Patent Document 4, the sealing resin is also filled inside the middle plate, and this filling is the distribution of the resin for spraying the sealing resin on the temporary joint portion of the edge portion. It is a path, and does not have a specific shape portion having a function added to a portion other than the edge portion of the hollow molded product.

Tokuhei 2-3387 No. Japanese Unexamined Patent Publication No. 8-229978 JP-A-2002-113785 Japanese Patent No. 5271318

An object of the present invention is not a laborious method of assembling separately prepared constituent members in a method of producing a hollow molded product in which end edges of a plastic divided molded product divided into a plurality of parts are joined and united. It is an object of the present invention to provide a method of imparting a specific shape portion having a function at the same time as the combination of products.

In the method for producing a hollow molded product of the present invention, a sealing resin is sprayed and arranged on an edge temporary joint of a preliminary united product in which each end edge of a plastic divided molded product formed by dividing into a plurality of parts is temporarily joined. The gap portion formed by solidifying and main-joining the edge temporary joints, and temporarily joining a part of the divided shape portions formed in the portions other than the end edges of each of the divided molded products. In addition, the sealing resin is spray-arranged and solidified, and the temporarily joined divided shape portions are main-bonded to form a specific shape portion having a function in a portion other than the edge portion.

In the above method, each end edge of the plastic divided molded product is main-bonded with a sealing resin, and at the same time, the divided shape formed in each divided molded product is formed in order to form a specific shape that functions in the molded hollow part. This is to create a hollow molded product in which a specific shape portion having a function is formed by main joining the portions with a sealing resin.

Then, in the method of producing the duct-shaped hollow molded product by the above method, the sealing resin is attached to the edge temporary joint portion of the preliminary united product in which each end edge portion of the plastic split molded product formed by dividing into two is temporarily joined. Is welded and solidified to form a temporary joint of the edge temporary joints, and a gap portion formed by temporarily joining the tip portions of the split rib portions formed inside each of the divided molded products by abutting each other. In addition, the sealing resin is spray-arranged and solidified, and the temporarily joined split rib portions are main-joined to form a resonance prevention rib as an internal specific shape portion of the hollow molded product.

Further, the method for producing a hollow molded product for treating a small amount of wastewater by the above method is a preliminary method in which each end edge portion of the plastic split molded product formed by dividing into three parts of the lid, the insert and the main body is temporarily joined. A sealing resin is spray-arranged and solidified on the edge temporary joint of the united product, and the edge temporary joint is main-bonded, and wastewater formed in a portion other than each edge of the divided molded product. The sealing resin is spray-arranged and solidified in a gap formed by temporarily joining a part of each of the insert-side split shape portion and the main body-side split shape portion of the processing path to form the insert-side split shape portion. It is characterized in that a wastewater treatment path is formed inside the hollow molded product, which is characterized by mainly joining the split shape portion on the main body side to form a wastewater treatment path as a specific shape portion inside the hollow molded product.

According to the method of the present invention, it is possible to join the edge portions of a plurality of divided plastic divided molded products with a sealing resin and combine them, and at the same time, form a specific shape having a function in a portion other than the edge portions. Therefore, it is possible to efficiently produce a hollow molded product having a specific shape without the trouble of assembling a separately prepared component member.

Then, by the above-mentioned production method, a plastic duct-shaped hollow molded product as an intake / exhaust duct attached to various equipments and a hollow molded product as a small amount of wastewater treatment device can be efficiently produced.

The perspective appearance explanatory view of the duct-shaped hollow molded article produced by the method of this invention. The back explanatory view and the AA cross-sectional explanatory view of the molded article of the same as above. A cross-sectional explanatory view of a state in which the front and back split molded products are fitted with a mold, molded, and then the sealing resin is sprayed and solidified. An assembly explanatory view of a split molded product of a hollow molded product for treating a small amount of waste liquid produced by the method of the present invention, and an explanatory perspective view of the hollow molded product after the main joining. The cross-sectional explanatory view of the BB line of the same molded product. The cross-sectional explanatory view of the CC line of the same molded product. The cross-sectional explanatory view of the state in which each of the divided molded products of the same molded product is fitted with a mold, molded, and then the sealing resin is sprayed and solidified.

The present invention will be described in detail below with reference to the figures which are examples.

FIG. 1 is a perspective explanatory view of the duct-shaped hollow molded product 1 produced by the method of the present invention, and FIG. 2 is a rear view and an AA cross-sectional explanatory view. The duct-shaped hollow molded product 1 is a plastic split-molded product that is divided into two parts, that is, the front split-molded product 10 and the back-split-molded product 11 are edge portions 12 and 13 of the split-molded products, respectively. This is mainly joined by the sealing resin 3 which is spray-arranged from the gate 24 for edge joining. The end edge portions 12 and 13 of the divided molded products are temporarily joined as shown in the enlarged view at the lower right of FIG. 2, and are sealed from the gate 24 in the edge temporary joint portion which is a gap formed by the temporary joining. The resin 3 is spray-arranged and solidified to form a main bond.

Then, the temporary edge joints are mainly joined as described above, and the bottom surface 15 and the back surface of the split rib portion 14, which is a split shape portion formed in a portion other than the edge portion 12 in the front split molded product 10. The sealing resin 3 is sprayed and solidified from the gate 25 for joining the split shape portion in the gap portion formed by temporarily joining the bottom surface 17 of the split rib portion 16 similarly formed on the split molded product 11. , The temporarily joined split rib portions are main-joined to form ribs having a specific shape inside the duct-shaped hollow molded product 1. In the duct-shaped hollow molded product 1 shown in the figure, two ribs are provided in parallel with the air flow flowing through the hollow portion, and these ribs are formed by the air flow from the intake port 18 to the exhaust port 19. It plays a role of preventing the outer wall of the hollow product from resonating.

In the main joining of the end edge portion and the split rib portion, as shown in FIG. 3, the front split product 10 and the back split product 11 are molded by the dies 20 and 21, and the runner 22 passes through the gate 24. The sealing resin 3 is spray-arranged on the edge portion, and the sealing resin 3 is spray-arranged from the runner 23 via the gate 25 in the gap formed by the bottom surfaces 15 and 17 of the split rib portion to be solidified. Can be done by In this way, a duct-shaped hollow molded product in which ribs are formed inside the hollow can be produced.

As described above, in the duct-shaped hollow molded product, the edge portion can be main-bonded with the sealing resin, and the vibration-proof rib can be formed inside the hollow product which is a portion other than the edge portion. However, in addition to such ribs, various specific shapes are often given to the hollow portion of the duct-shaped hollow molded product 1. For example, in order to attach a duct-shaped hollow molded product, the hollow portion is penetrated to form a boss for attaching a bolt or the like, so that each divided molded product is subjected to the same method as the above-mentioned rib formation. By forming the boss split portion and joining and forming the split portion, it is possible to provide a boss that penetrates the hollow portion in the same manner as the above rib.

Furthermore, when the duct-shaped hollow molded product is used as the exhaust duct of the cooking hood, it is also applied to the case where a baffle plate for preventing mist such as cooking oil from being discharged together with the exhaust is provided inside the hollow. be able to.

FIG. 4 is an assembly explanatory view of the plastic split molded product of the hollow molded product 2 for treating a small amount of waste liquid produced by the method of the present invention, and FIG. 5 is a perspective explanatory view of the hollow molded product after the main joining. FIG. FIG. 4 is an explanatory view of a cross section taken along line BB in FIG. 4, and FIG. 6 is an explanatory view of a cross section taken along line CC in FIG. 4 of the molded product. In the hollow product 2 for treating a small amount of waste water, the lid 30, the insert 40, and the main body 50, which are plastic split-molded products formed by dividing into three, are lids of the respective split-molded products, as shown in FIG. The body end edge portion 31, the insert body end edge portion 41, and the main body end edge portion 51 are main-bonded by the sealing resin 3 which is spray-arranged from the gate 24.

As shown in FIGS. 4 to 6, a wastewater injection pipe 32 is formed in the lid body 30 that forms the lid portion that covers the upper portion of the hollow molded product 2. Then, the insert body 40, which is inserted into the main body 50 and is covered with the lid 30 to form the first half wastewater treatment part of the wastewater treatment part, is formed so as to project outward. A partition fence 44, a partition wall 45, and a wastewater passage port 46 are formed inside the wastewater receiving tank 60, and the wastewater receiving tank 60 and the wastewater treatment sections 61 and 62 from the partition fence 44 to the wastewater passage port 46. It constitutes the first half wastewater treatment section consisting of. Further, partition walls 53 and 54 are formed in the main body 50 into which the insertion body 40 is inserted to form a latter half wastewater treatment section including wastewater treatment sections 63, 64 and 65, which are main body side divided shape portions. There is.

The insert body 40 and the main body 50 are not only mainly joined at the insert body end edge portion 41 and the main body end edge portion 51, respectively, but are also a part of the insert body side divided shape portion other than these end edge portions. A gate is formed in a gap formed by temporarily joining the root portion 43 of the wastewater receiving tank 60 and the wastewater receiving tank mounting port 52 which is a part of the main body side divided shape portion similarly formed in the main body 50. The sealing resin 3 is spray-arranged from 25 via the sealing resin injection path 42, and then the base portion 43 of the wastewater receiving tank and the wastewater receiving tank mounting port 52, which are temporarily joined by solidifying, are mainly joined to treat the first half of the wastewater. The portion and the latter half wastewater treatment portion are combined to form a wastewater treatment path as a specific shape inside the hollow molded product 2 for small amount wastewater treatment. In FIG. 7, in the same manner as shown in FIG. 3, the lid 30, the insert 40, and the main body 50 are molded by the molds 26 and 27 by the molds 26 and 27, and the runners 22 pass through the gate 24, respectively. The sealing resin 3 is spray-arranged on the edge portions 31, 41, 51, and the sealing resin 3 is injected from the runner 23 through the sealing resin injection portion 42 provided in the gate 25 and the insert 40, and the base of the wastewater receiving tank. By spraying and solidifying the gap formed by the portion 43 and the wastewater receiving tank mounting port 52, a wastewater treatment path can be formed between the main joint of the edge portion and the inside of the hollow body.

In the above wastewater treatment route, the wastewater received from the wastewater injection pipe 32 into the wastewater receiving tank 60 overflows from the upper edge of the wastewater receiving tank 60, passes through the partition fence 44, and is the wastewater route shown by the arrow in FIG. The wastewater treatment units 61, 62, 63, which are configured by a route through a, b, c, d, and e in this order and discharged at the treated water discharge port 55, are shown in FIGS. 64 and 65 are configured in this order. The wastewater treatment units 61 to 65 are filled with a solid treatment material.

The solid treatment material to be filled is filled with various treatment materials depending on the properties of waste water, for example, a neutralizing material such as calcium carbonate, an adsorbent such as activated carbon, zeolite, diatomaceous earth, silica gel, and activated alumina. It is used for wastewater treatment such as neutralization, decolorization, and adsorption of harmful substances. A small amount of wastewater treatment device using such a hollow molded product is not only used for treating a small amount of wastewater discharged from a laboratory or a laboratory as described above, but also for drain wastewater treatment of combustion gas of a hot water supply device. Is also preferably applied.

1 Duct-shaped hollow molded product 2 Hollow molded product for small amount waste liquid treatment 3 Encapsulating resin 10 Front split molded product 11 Back split molded product 12 Edge part (front split molded product) 13 Edge part (back split molded product)
14 Divided rib part (front) 15 Divided rib part bottom (front)
16 Divided rib part (back side) 17 Bottom part of split rib part (back side)
18 Intake port 19 Exhaust port 20, 21, 26, 27 Mold 22 Runner (for end edge joining) 23 Runner (for split shape part joining)
24 gates (for joining edge edges) 25 gates (for joining split shapes)
30 Lid 31 Lid edge 32 Wastewater injection pipe 40 Insert 41 Insert edge 42 Sealing resin injection path 43 Wastewater receiving tank base 44 Partition fence 45 Partition wall 46 Wastewater passage 50 Main body 51 Main body edge 52 Wastewater receiving tank mounting port 53, 54 Partition wall 55 Treated water discharge port 60 Wastewater receiving tank
61, 62, 63, 64, 65 Wastewater treatment section a, b, c, d, e Wastewater passage route

Claims (3)

A sealing resin is sprayed and solidified on the edge temporary joint of the pre-combined product in which each edge of the plastic divided molded product that has been divided and molded into a plurality of parts is temporarily joined, and the edge temporary joint is formed. The sealing resin is sprayed and solidified in the voids formed by temporarily joining a part of the divided shape portions formed in the portions other than the edge portions of the divided molded products. A method for producing a hollow molded product, which comprises main joining the temporarily joined divided shaped portions to form a specific shaped portion in a portion other than the edge portion. The sealing resin is spray-arranged and solidified on the edge temporary joint of the pre-combined product in which each edge of the plastic divided molded product that has been molded in two parts is temporarily joined, and the edge temporary joint is formed into a book. At the same time as joining, the sealing resin is spray-arranged and solidified in the voids formed by tentatively joining the tips of the split ribs formed inside each of the divided molded products by abutting each other to temporarily join them. A method for producing a duct-shaped hollow molded product, which comprises main joining the divided rib portions to form ribs as a specific shape portion inside the hollow molded product. The sealing resin is spray-arranged and solidified on the edge temporary joint of the pre-combined product in which each end edge of the plastic divided molded product formed by dividing into three parts of the lid, the insert and the main body is temporarily joined. Then, the temporary edge joints are mainly joined, and one of the insert-side split shape portion and the main body-side split shape portion of the wastewater treatment path formed in the portion other than the end edge portion of each of the divided molded products. The sealing resin is spray-arranged and solidified in the voids formed by temporarily joining the portions to each other, and the insert body side split shape portion and the main body side split shape portion are mainly joined to specify the inside of the hollow molded product. A method for producing a hollow molded product for treating a small amount of wastewater, which comprises forming a wastewater treatment path as a shape portion.

Images