WO2024111252A1 - Production device and production method for resin molded article - Google Patents

Production device and production method for resin molded article Download PDF

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Publication number
WO2024111252A1
WO2024111252A1 PCT/JP2023/035940 JP2023035940W WO2024111252A1 WO 2024111252 A1 WO2024111252 A1 WO 2024111252A1 JP 2023035940 W JP2023035940 W JP 2023035940W WO 2024111252 A1 WO2024111252 A1 WO 2024111252A1
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layer
pair
recycled
barrier
layers
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PCT/JP2023/035940
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French (fr)
Japanese (ja)
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龍志 谷
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八千代工業株式会社
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Publication of WO2024111252A1 publication Critical patent/WO2024111252A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/20—Making multilayered or multicoloured articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers

Definitions

  • the present invention relates to an apparatus and method for manufacturing resin molded products.
  • Patent Document 1 discloses a resin molded product with a multilayer structure in which an innermost layer made of HDPE, an adhesive layer, a barrier layer made of EVOH, an adhesive layer, a recycled layer made of recycled materials, and an outermost layer made of HDPE are layered from the inner surface to the outer surface.
  • the recycled layer may be made of recycled materials obtained by crushing unneeded fuel tanks, etc.
  • the recycled material since the fuel tanks, etc. have been in use for a long period of time, the recycled material has absorbed odors from the fuel, etc. Therefore, if the recycled layer is placed on the outside of the barrier layer, there is a problem that the odors will leak to the outside.
  • the present invention was conceived from this perspective, and aims to provide a manufacturing device and manufacturing method for resin molded products that uses a simple configuration to prevent odors from the recycled layer from leaking to the outside.
  • the present invention is characterized by comprising a die head that extrudes a parison having a main material layer made of a plastic material, a barrier layer made of a barrier material, a first adhesive layer that bonds the main material layer and the barrier layer, a recycled layer made of a recycled material, and a second adhesive layer that bonds the recycled layer and the barrier layer, and a molding die that forms a pair of multilayer sheets from the parison and molds them into a desired shape with the pair of recycled layers attached to the inside of the pair of barrier layers.
  • the present invention is also characterized by comprising a preparation step of preparing a pair of multilayer sheets comprising a main material layer made of a plastic material, a barrier layer made of a barrier material, a first adhesive layer bonding the main material layer and the barrier layer, a recycled layer made of a recycled material, and a second adhesive layer bonding the recycled layer and the barrier layer, and a molding step of laminating the multilayer sheets together with the pair of recycled layers positioned inside the pair of barrier layers, and molding the multilayer sheets in a molding die.
  • the pair of multilayer sheets are formed by cutting the parison extruded into a cylindrical shape.
  • multi-layer sheets can be easily prepared.
  • the orientation of the multilayer sheet can be easily changed.
  • the manufacturing device and manufacturing method for resin molded products according to the present invention can suppress the odor of the recycled layer from leaking to the outside with a simple configuration.
  • FIG. 1 is a schematic side view showing a manufacturing apparatus for a resin molded product according to an embodiment of the present invention.
  • 1 is a side cross-sectional view showing a multilayer sheet according to an embodiment of the present invention.
  • FIG. 4 is a schematic side view showing an operating state of the conveying device.
  • FIG. 2 is a cross-sectional side view showing the multilayer sheet after inversion.
  • FIG. 13 is a diagram showing a first modified example.
  • FIG. 13 is a diagram showing a modified example 2.
  • the manufacturing apparatus 1 for resin molded products includes a die head 2, a molding die 3, and a pair of conveying units 4, 4.
  • the manufacturing apparatus 1 for resin molded products is an apparatus for manufacturing plate-shaped resin molded products such as bumpers and bodies.
  • the die head 2 is disposed above the molding die 3 and is a supply device that supplies the parison S to the molding die 3.
  • the parison S is made by laminating multiple types of molten resins, and is a precursor that is extruded from the die head 2.
  • the cylindrical parison S (see also FIG. 5) supplied from the die head 2 is cut in the height direction to form the multilayer sheets 10, 10 described below.
  • the molding die 3 comprises a first molding die 3a and a second molding die 3b.
  • the first molding die 3a and the second molding die 3b are arranged facing each other.
  • the first molding die 3a is formed with a molding portion 30a that is concave relative to the parison S.
  • the second molding die 3b is formed with a molding portion 30b that is convex relative to the parison S.
  • the first molding die 3a and the second molding die 3b can be opened and closed by moving in the left-right direction, and the supplied parison S can be molded into the desired shape by sandwiching and pressing it from the left and right.
  • the conveying unit 4 is a device that holds the multilayer sheet 10 by sandwiching it.
  • a pair of conveying units 4, 4 are arranged on the left and right of the parison S.
  • the conveying unit 4 is capable of holding the multilayer sheet 10 and transporting it to a predetermined position.
  • the conveying unit 4 can also rotate around a vertical axis while holding the multilayer sheet 10.
  • the multilayer sheet 10 of this embodiment will be described.
  • the multilayer sheet 10 is formed by cutting the cylindrical parison S at two positions in the height direction using a cutter device (not shown).
  • the multilayer sheet 10 shown in FIG. 2 shows the state immediately after cutting.
  • the multilayer sheet 10 has a rectangular plate shape (sheet shape).
  • the multilayer sheets 10, 10 include, from the inner layer side to the outer layer side, a main material layer 11, a first adhesive layer 12, a barrier layer 13, a second adhesive layer 14, a recycled layer 15, and a main material layer 16.
  • the layer structure of the multilayer sheets 10, 10 is symmetrical on both sides of the vertical central axis.
  • the main material layer 11 is a layer that serves as the base material for the resin molded product to be formed, and is made of a thermoplastic resin such as HDPE (high density polyethylene) or PE (polyethylene).
  • HDPE high density polyethylene
  • PE polyethylene
  • the barrier layer 13 is a layer that prevents odors (gases) from penetrating inward and outward directions of the resin molded product being molded, and is made of, for example, EVOH (ethylene-vinyl alcohol copolymer resin).
  • the recycled layer 15 is a layer made from recycled materials.
  • the recycled layer 15 can be used to recover unnecessary parts such as parison scraps and burrs, or to crush and reuse used hollow plastic molded products (such as automobile fuel tank products).
  • the first adhesive layer 12 is a layer that bonds the main material layer 11 and the barrier layer 13, and is formed, for example, from modified PE (modified polyethylene), epoxy, etc.
  • the second adhesive layer 14 is a layer that bonds the barrier layer 13 and the recycled layer 15, and is formed, for example, from modified PE (modified polyethylene), epoxy, etc.
  • the main material layer 16 is a layer that serves as the base material for the resin molded product to be formed, and is formed of a thermoplastic resin such as HDPE (high density polyethylene) or PE (polyethylene).
  • the main material layer 16 may be omitted. In other words, the layer structure may be set so that the recycled layer 15 is the outermost layer.
  • the method for producing a resin molded product according to the present embodiment includes a preparation step, a placement step, and a molding step.
  • the preparation process is a process for preparing multilayer sheets 10, 10.
  • a cylindrical parison S supplied from a die head 2 is cut in the height direction using a cutter device (not shown). This results in the formation of multilayer sheets 10, 10 having the layer structure shown in FIG. 2.
  • the multilayer sheets 10, 10 are held by conveying sections 4, 4, respectively.
  • the arrangement process is a process of inverting the multilayer sheets 10, 10.
  • the multilayer sheets 10, 10 are held by the conveying units 4, 4, respectively, and are inverted relative to each other. That is, in the arrangement process, the conveying unit 4 is rotated 180° about the vertical axis.
  • the main material layers 16, 16 of the multilayer sheets 10, 10 face each other, and the main material layers 11, 11 face outward. Note that if the main material layer 16 is omitted, the recycled layers 15 are arranged to face each other.
  • the molding process is a process in which the mold 3 is clamped to mold a resin molded product of the desired shape. As shown in FIG. 5, the first mold 3a and the second mold 3b are moved toward each other to sandwich the multilayer sheets 10, 10. At this time, the multilayer sheets 10, 10 are bonded together with the pair of recycled layers 15 positioned inside the pair of barrier layers 13. After press molding, the product is cooled, and the resin molded product is removed from the first mold 3a and the second mold 3b to complete the resin molded product.
  • a resin molded product can be formed in which the recycled layers 15, 15 are sandwiched between the barrier layers 13, 13 from the outside. This allows the odor of the recycled layer 15 to be blocked by the barrier layers 13, 13, preventing it from leaking to the outside.
  • the multilayer sheets 10, 10 can be formed simply by cutting the parison S extruded into a cylindrical shape.
  • the recycled layers 15, 15 can be placed inside the barrier layers 13, 13 simply by inverting each of the multilayer sheets 10, 10 in the conveying section 4.
  • the layer structure in Fig. 2 is a structure used when forming a hollow resin container such as a fuel tank. That is, a barrier layer 13 is provided to prevent the fuel stored inside from permeating to the outside, and a recycled layer 15 and a main material layer 16 are provided on the outside.
  • the layer structure of the parison S may be set to have the layer structure shown in Fig. 4 at the stage of supplying resin to the die head 2.
  • changing the position of each material supplied to the die head 2 is not easy because the design must be changed taking into account the viscosity of the material, the opening width of the flow path, etc. In other words, in practice, the layer structure of the parison S cannot be changed frequently.
  • the layer structure can be easily changed by using the conveying units 4, 4 while still using the conventional die head 2 (leaving the conventional layer structure unchanged).
  • the recycled layers 15, 15 can be sandwiched between the barrier layers 13, 13 by the simple method of inverting the multilayer sheets 10, 10 using the conveying units 4, 4.
  • ⁇ Modification 1> 6 is a diagram showing Modification 1.
  • plate-shaped (sheet-shaped) multilayer sheets 10, 10 are prepared from the beginning, instead of a cylindrical parison.
  • a total of two sheet-like multilayer sheets 10 are molded by a co-extrusion multilayer T-die method.
  • the multilayer sheets 10, 10 are laminated together so that they have the same layer structure as in Figure 4, and are held by conveying sections 4A, 4A. When holding the sheets, they may be heated from both sides by heaters H, H.
  • the laminated multilayer sheets 10, 10 are transported by conveying sections 4A, 4A to the molding die 3, where they can be molded.
  • Modification 2 uses a molding die 40.
  • the molding die 40 molds the multilayer sheets 10, 10 by vacuum drawing. In this manner, in the molding process, a resin molded product may be molded by vacuum drawing.
  • the layer structure of the multilayer sheet 10 (type of resin, thickness of each layer, etc.) is not limited to the above, and can be set as appropriate.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Laminated Bodies (AREA)

Abstract

The present invention is characterized by comprising: a die head (2) which pushes out a parison (S) having a primary material layer (11) that is made of a plastic material, a barrier layer (13) that is made of a barrier material, a first adhesive layer (12) that bonds the primary material layer (11) and the barrier layer (13) together, a recycle layer (15) that is made of a recycled material, and a second adhesive layer (14) that bonds the recycle layer (15) and the barrier layer (13) together; and a molding die (3) in which a pair of multi-layer sheets formed from the parison (S) are molded so as to have a desired shape in a state such that a pair of recycle layers (15) are bonded inward of a pair of barrier layers (13).

Description

樹脂成形品の製造装置及び製造方法Manufacturing device and manufacturing method for resin molded products
　本発明は、樹脂成形品の製造装置及び製造方法に関する。 The present invention relates to an apparatus and method for manufacturing resin molded products.
　エネルギー資源の節約や環境負荷の低減を目的として、再生資源プラスチック等のリサイクル材料を用いて容器を製造することが行われている。例えば特許文献１には、ＨＤＰＥからなる最内層、接着層、ＥＶＯＨからなるバリア層、接着層、リサイクル材料からなるリサイクル層、ＨＤＰＥからなる最外層が、内面から外面に向かって積層された多層構造の樹脂成形品が開示されている。 In order to conserve energy resources and reduce the burden on the environment, containers are being manufactured using recycled materials such as regenerated plastics. For example, Patent Document 1 discloses a resin molded product with a multilayer structure in which an innermost layer made of HDPE, an adhesive layer, a barrier layer made of EVOH, an adhesive layer, a recycled layer made of recycled materials, and an outermost layer made of HDPE are layered from the inner surface to the outer surface.
特開２０１５－１９３７３４号公報JP 2015-193734 A
　例えば、不要になった燃料タンク等を破砕して得られたリサイクル材料でリサイクル層を構成する場合がある。この場合、燃料タンク等が長期間に亘って使用されているため、リサイクル材料に燃料等による臭気が付着している。そのため、バリア層の外側にリサイクル層を配置した場合、臭気が外部に漏れてしまうという問題がある。 For example, the recycled layer may be made of recycled materials obtained by crushing unneeded fuel tanks, etc. In this case, since the fuel tanks, etc. have been in use for a long period of time, the recycled material has absorbed odors from the fuel, etc. Therefore, if the recycled layer is placed on the outside of the barrier layer, there is a problem that the odors will leak to the outside.
　本発明は、このような観点から創案されたものであって、簡易な構成でリサイクル層の臭気が外部へ漏れるのを抑制する樹脂成形品の製造装置及び製造方法を提供することを目的とする。 The present invention was conceived from this perspective, and aims to provide a manufacturing device and manufacturing method for resin molded products that uses a simple configuration to prevent odors from the recycled layer from leaking to the outside.
　前記課題を解決するため、本発明は、プラスチック材からなる主材層と、バリア材からなるバリア層と、前記主材層と前記バリア層を接着する第一接着層と、リサイクル材からなるリサイクル層と、前記リサイクル層と前記バリア層を接着する第二接着層と、を有するパリソンを押し出すダイヘッドと、前記パリソンから一対の多層シートが形成されるとともに、一対の前記リサイクル層が一対の前記バリア層の内側となるように張り合わされた状態で所望の形に成形する成形型と、を備えることを特徴とする。 In order to solve the above problems, the present invention is characterized by comprising a die head that extrudes a parison having a main material layer made of a plastic material, a barrier layer made of a barrier material, a first adhesive layer that bonds the main material layer and the barrier layer, a recycled layer made of a recycled material, and a second adhesive layer that bonds the recycled layer and the barrier layer, and a molding die that forms a pair of multilayer sheets from the parison and molds them into a desired shape with the pair of recycled layers attached to the inside of the pair of barrier layers.
　また、本発明は、プラスチック材からなる主材層と、バリア材からなるバリア層と、前記主材層と前記バリア層を接着する第一接着層と、リサイクル材からなるリサイクル層と、前記リサイクル層と前記バリア層を接着する第二接着層と、を備える一対の多層シートを準備する準備工程と、一対の前記リサイクル層を一対の前記バリア層の内側に配置した状態で前記多層シート同士を張り合わせ成形型で成形する成形工程と、を備えることを特徴とする。 The present invention is also characterized by comprising a preparation step of preparing a pair of multilayer sheets comprising a main material layer made of a plastic material, a barrier layer made of a barrier material, a first adhesive layer bonding the main material layer and the barrier layer, a recycled layer made of a recycled material, and a second adhesive layer bonding the recycled layer and the barrier layer, and a molding step of laminating the multilayer sheets together with the pair of recycled layers positioned inside the pair of barrier layers, and molding the multilayer sheets in a molding die.
　本発明によれば、一対のリサイクル層を一対のバリア層で挟むことで、臭気が外部へ漏れ出ることを抑制することができる。 According to the present invention, by sandwiching a pair of recycled layers between a pair of barrier layers, it is possible to prevent odors from leaking to the outside.
　また、前記一対の多層シートは、筒状に押し出される前記パリソンをカットすることで形成されることが好ましい。 Furthermore, it is preferable that the pair of multilayer sheets are formed by cutting the parison extruded into a cylindrical shape.
　本発明によれば、多層シートを容易に準備することができる。 According to the present invention, multi-layer sheets can be easily prepared.
　また、前記パリソンから形成された一対の多層シートを保持するとともに、当該一対の多層シートを互いに反転させ、一対の前記リサイクル層が一対の前記バリア層の内側となるように配置する搬送部を備えることが好ましい。 It is also preferable to have a conveying unit that holds a pair of multilayer sheets formed from the parison, inverts the pair of multilayer sheets with respect to each other, and positions the pair of recycled layers on the inside of the pair of barrier layers.
　本発明によれば、多層シートの向きを容易に変更することができる。 According to the present invention, the orientation of the multilayer sheet can be easily changed.
　本発明に係る樹脂成形品の製造装置及び製造方法によれば、簡易な構成でリサイクル層の臭気が外部へ漏れるのを抑制することができる。 The manufacturing device and manufacturing method for resin molded products according to the present invention can suppress the odor of the recycled layer from leaking to the outside with a simple configuration.
本発明の実施形態に係る樹脂成形品の製造装置を示す概略側面図である。1 is a schematic side view showing a manufacturing apparatus for a resin molded product according to an embodiment of the present invention. 本発明の実施形態に係る多層シートを示す側断面図である。1 is a side cross-sectional view showing a multilayer sheet according to an embodiment of the present invention. 搬送装置の稼働状況を示す概略側面図である。FIG. 4 is a schematic side view showing an operating state of the conveying device. 反転後の多層シートを示す側断面図である。FIG. 2 is a cross-sectional side view showing the multilayer sheet after inversion. プレス成形を示す側面図である。FIG. 変形例１を示す図である。FIG. 13 is a diagram showing a first modified example. 変形例２を示す図である。FIG. 13 is a diagram showing a modified example 2.
≪実施形態に係る樹脂成形品の製造装置≫
　図１に示すように、樹脂成形品の製造装置１は、ダイヘッド２と、成形型３と、一対の搬送部４，４を備えている。樹脂成形品の製造装置１は、例えばバンパーやボディ等の板状の樹脂成形品を製造する装置である。 <<Apparatus for manufacturing resin molded products according to an embodiment>>
1, the manufacturing apparatus 1 for resin molded products includes a die head 2, a molding die 3, and a pair of conveying units 4, 4. The manufacturing apparatus 1 for resin molded products is an apparatus for manufacturing plate-shaped resin molded products such as bumpers and bodies.
　ダイヘッド２は、成形型３の上部に配置され、成形型３にパリソンＳを供給する供給装置である。パリソンＳは、複数の種類からなる溶融樹脂を積層して構成されており、ダイヘッド２から押し出される前駆体である。本実施形態では、ダイヘッド２から供給された筒状のパリソンＳ（図５も参照）を高さ方向にカットして、後述する多層シート１０，１０を形成する。 The die head 2 is disposed above the molding die 3 and is a supply device that supplies the parison S to the molding die 3. The parison S is made by laminating multiple types of molten resins, and is a precursor that is extruded from the die head 2. In this embodiment, the cylindrical parison S (see also FIG. 5) supplied from the die head 2 is cut in the height direction to form the multilayer sheets 10, 10 described below.
　成形型３は、第１成形型３ａと、第２成形型３ｂとを備えている。第１成形型３ａ及び第２成形型３ｂは互いに向かい合って配置されている。第１成形型３ａにはパリソンＳに対して凹状になる成形部３０ａが形成されている。第２成形型３ｂには、パリソンＳに対して凸状となる成形部３０ｂが形成されている。第１成形型３ａ及び第２成形型３ｂは左右方向に移動することで開閉可能であり、供給されたパリソンＳを左右方向から挟み込んでプレスすることで、所望の形状に成形することができる。 The molding die 3 comprises a first molding die 3a and a second molding die 3b. The first molding die 3a and the second molding die 3b are arranged facing each other. The first molding die 3a is formed with a molding portion 30a that is concave relative to the parison S. The second molding die 3b is formed with a molding portion 30b that is convex relative to the parison S. The first molding die 3a and the second molding die 3b can be opened and closed by moving in the left-right direction, and the supplied parison S can be molded into the desired shape by sandwiching and pressing it from the left and right.
　搬送部４は、多層シート１０を挟んで保持する装置である。搬送部４，４はパリソンＳの左右に一対配置されている。搬送部４は、多層シート１０を保持するとともに、所定の位置に搬送することが可能である。また、搬送部４は、多層シート１０を保持した状態で鉛直方向軸回りに回転させることができる。 The conveying unit 4 is a device that holds the multilayer sheet 10 by sandwiching it. A pair of conveying units 4, 4 are arranged on the left and right of the parison S. The conveying unit 4 is capable of holding the multilayer sheet 10 and transporting it to a predetermined position. The conveying unit 4 can also rotate around a vertical axis while holding the multilayer sheet 10.
≪実施形態に係る多層シート≫
　次に、本実施形態の多層シート１０について説明する。前記したように、多層シート１０は、筒状のパリソンＳをカッター装置（図示省略）を用いて高さ方向に二か所でカットすることで形成される。図２に示す多層シート１０は、カットした直後の状態を示している。多層シート１０は、矩形板状（シート状）を呈する。多層シート１０，１０は、内層側から外層側に向かって、主材層１１と、第一接着層１２と、バリア層１３と、第二接着層１４と、リサイクル層１５と、主材層１６と、を備えている。つまり、筒状のパリソンＳを高さ方向にカットしているため、多層シート１０，１０の層構成は鉛直方向の中心軸を挟んで左右対称になっている。 <Multilayer sheet according to an embodiment>
Next, the multilayer sheet 10 of this embodiment will be described. As described above, the multilayer sheet 10 is formed by cutting the cylindrical parison S at two positions in the height direction using a cutter device (not shown). The multilayer sheet 10 shown in FIG. 2 shows the state immediately after cutting. The multilayer sheet 10 has a rectangular plate shape (sheet shape). The multilayer sheets 10, 10 include, from the inner layer side to the outer layer side, a main material layer 11, a first adhesive layer 12, a barrier layer 13, a second adhesive layer 14, a recycled layer 15, and a main material layer 16. In other words, since the cylindrical parison S is cut in the height direction, the layer structure of the multilayer sheets 10, 10 is symmetrical on both sides of the vertical central axis.
　主材層１１は、成形される樹脂成形品の基材となる層であって、例えば、ＨＤＰＥ（高密度ポリエチレン）、ＰＥ（ポリエチレン）等の熱可塑性樹脂で形成されている。 The main material layer 11 is a layer that serves as the base material for the resin molded product to be formed, and is made of a thermoplastic resin such as HDPE (high density polyethylene) or PE (polyethylene).
　バリア層１３は、成形される樹脂成形品の内外方向に臭気（気体）が透過するのを防ぐ層であって、例えば、ＥＶＯＨ（エチレン・ビニルアルコール共重合樹脂）で形成されている。 The barrier layer 13 is a layer that prevents odors (gases) from penetrating inward and outward directions of the resin molded product being molded, and is made of, for example, EVOH (ethylene-vinyl alcohol copolymer resin).
　リサイクル層１５は、リサイクル品を原料として構成された層である。リサイクル層１５は、例えば、パリソンのスクラップ、バリ等の不要部分を回収したり、利用済みの中空プラスチック成形品（自動車用燃料タンク製品等）を粉砕して再利用したりすることもできる。 The recycled layer 15 is a layer made from recycled materials. For example, the recycled layer 15 can be used to recover unnecessary parts such as parison scraps and burrs, or to crush and reuse used hollow plastic molded products (such as automobile fuel tank products).
　第一接着層１２は、主材層１１及びバリア層１３を接着する層であり、例えば、変性ＰＥ（変性ポリエチレン）、エポキシ等によって形成されている。 The first adhesive layer 12 is a layer that bonds the main material layer 11 and the barrier layer 13, and is formed, for example, from modified PE (modified polyethylene), epoxy, etc.
　第二接着層１４は、バリア層１３及びリサイクル層１５を接着する層であり、例えば、変性ＰＥ（変性ポリエチレン）、エポキシ等によって形成されている。 The second adhesive layer 14 is a layer that bonds the barrier layer 13 and the recycled layer 15, and is formed, for example, from modified PE (modified polyethylene), epoxy, etc.
　主材層１６は、成形される樹脂成形品の基材となる層であって、例えば、ＨＤＰＥ（高密度ポリエチレン）、ＰＥ（ポリエチレン）等の熱可塑性樹脂で形成されている。なお、主材層１６は省略してもよい。つまり、リサイクル層１５が最外層となるように層構成を設定してもよい。 The main material layer 16 is a layer that serves as the base material for the resin molded product to be formed, and is formed of a thermoplastic resin such as HDPE (high density polyethylene) or PE (polyethylene). The main material layer 16 may be omitted. In other words, the layer structure may be set so that the recycled layer 15 is the outermost layer.
≪樹脂成形品の製造方法≫
　次に、本実施形態に係る樹脂成形品の製造方法について説明する。本実施形態の樹脂成形品の製造方法は、準備工程と、配置工程と、成形工程と、を行う。 <Manufacturing method of resin molded products>
Next, a method for producing a resin molded product according to the present embodiment will be described. The method for producing a resin molded product according to the present embodiment includes a preparation step, a placement step, and a molding step.
　準備工程は、多層シート１０，１０を用意する工程である。準備工程では、図１に示すように、ダイヘッド２から供給された筒状のパリソンＳを、カッター装置（図示省略）を用いて高さ方向にカットする。これにより、図２に示す層構成を備えた多層シート１０，１０が形成される。図３に示すように、多層シート１０，１０はそれぞれ搬送部４，４で保持する。 The preparation process is a process for preparing multilayer sheets 10, 10. In the preparation process, as shown in FIG. 1, a cylindrical parison S supplied from a die head 2 is cut in the height direction using a cutter device (not shown). This results in the formation of multilayer sheets 10, 10 having the layer structure shown in FIG. 2. As shown in FIG. 3, the multilayer sheets 10, 10 are held by conveying sections 4, 4, respectively.
　配置工程は、多層シート１０，１０を反転させる工程である。配置工程では、多層シート１０，１０を搬送部４，４でそれぞれ保持しつつ、互いに反転させる。つまり、配置工程では、鉛直方向軸に対して搬送部４を１８０°回転させる。これにより、図４に示すように、多層シート１０，１０の主材層１６，１６同士が対向し、主材層１１，１１が外側に向いた状態になる。なお、主材層１６を省略する場合は、リサイクル層１５同士が対向するように配置される。 The arrangement process is a process of inverting the multilayer sheets 10, 10. In the arrangement process, the multilayer sheets 10, 10 are held by the conveying units 4, 4, respectively, and are inverted relative to each other. That is, in the arrangement process, the conveying unit 4 is rotated 180° about the vertical axis. As a result, as shown in Figure 4, the main material layers 16, 16 of the multilayer sheets 10, 10 face each other, and the main material layers 11, 11 face outward. Note that if the main material layer 16 is omitted, the recycled layers 15 are arranged to face each other.
　成形工程は、成形型３を型締めして、所望の形の樹脂成形品を成形する工程である。図５に示すように、第１成形型３ａ及び第２成形型３ｂを互いに近接する方向に移動させ、多層シート１０，１０を挟持する。この時、多層シート１０，１０は、一対のリサイクル層１５が一対のバリア層１３の内側に配置した状態で張り合わされる。プレス成形後、冷却し、第１成形型３ａ及び第２成形型３ｂから樹脂成形品を取り出すことで、樹脂成形品が完成する。 The molding process is a process in which the mold 3 is clamped to mold a resin molded product of the desired shape. As shown in FIG. 5, the first mold 3a and the second mold 3b are moved toward each other to sandwich the multilayer sheets 10, 10. At this time, the multilayer sheets 10, 10 are bonded together with the pair of recycled layers 15 positioned inside the pair of barrier layers 13. After press molding, the product is cooled, and the resin molded product is removed from the first mold 3a and the second mold 3b to complete the resin molded product.
　以上説明した実施形態によれば、リサイクル層１５，１５がバリア層１３，１３で外側から挟まれた状態の樹脂成形品を成形することができる。これにより、リサイクル層１５の臭気がバリア層１３，１３で遮断され、外部に漏れ出ることを防ぐことができる。 According to the embodiment described above, a resin molded product can be formed in which the recycled layers 15, 15 are sandwiched between the barrier layers 13, 13 from the outside. This allows the odor of the recycled layer 15 to be blocked by the barrier layers 13, 13, preventing it from leaking to the outside.
　また、本実施形態の準備工程によれば、多層シート１０，１０は、筒状に押し出されるパリソンＳをカットするだけで形成することができる。 Furthermore, according to the preparation process of this embodiment, the multilayer sheets 10, 10 can be formed simply by cutting the parison S extruded into a cylindrical shape.
　また、本実施形態の配置工程によれば、搬送部４で多層シート１０，１０をそれぞれ反転させるだけで、リサイクル層１５，１５をバリア層１３，１３の内側に配置することができる。 Furthermore, according to the placement process of this embodiment, the recycled layers 15, 15 can be placed inside the barrier layers 13, 13 simply by inverting each of the multilayer sheets 10, 10 in the conveying section 4.
　ここで、図２の層構成は、燃料タンクなどの樹脂製中空容器を形成する際の構成になっている。つまり、内部に貯留する燃料が外部に透過しないようにバリア層１３を設け、その外側にリサイクル層１５，主材層１６を備えている。
　本実施形態の樹脂成形品を形成する際に、例えば、ダイヘッド２に樹脂を供給する段階で、図４の層構成となるようにパリソンＳの層構成を設定してもよい。しかし、ダイヘッド２に供給する各材料の位置を変更することは、材料の粘度や流路の開口幅等を考慮して設計変更しなければならないため容易ではない。つまり、実務上、パリソンＳの層構成は頻繁に変更することができない。 The layer structure in Fig. 2 is a structure used when forming a hollow resin container such as a fuel tank. That is, a barrier layer 13 is provided to prevent the fuel stored inside from permeating to the outside, and a recycled layer 15 and a main material layer 16 are provided on the outside.
When forming the resin molded product of this embodiment, for example, the layer structure of the parison S may be set to have the layer structure shown in Fig. 4 at the stage of supplying resin to the die head 2. However, changing the position of each material supplied to the die head 2 is not easy because the design must be changed taking into account the viscosity of the material, the opening width of the flow path, etc. In other words, in practice, the layer structure of the parison S cannot be changed frequently.
　この点、本実施形態によれば、従来のダイヘッド２を用いたまま（従来の層構成は変えないまま）、搬送部４，４を用いることで層構成を容易に変えることができる。つまり、搬送部４，４で多層シート１０，１０を反転させるという簡易な方法で、リサイクル層１５，１５をバリア層１３，１３で挟み込むことができる。 In this regard, according to the present embodiment, the layer structure can be easily changed by using the conveying units 4, 4 while still using the conventional die head 2 (leaving the conventional layer structure unchanged). In other words, the recycled layers 15, 15 can be sandwiched between the barrier layers 13, 13 by the simple method of inverting the multilayer sheets 10, 10 using the conveying units 4, 4.
＜変形例１＞
　図６は、変形例１を示す図である。変形例１に係る樹脂成形品の製造装置（樹脂成形品の製造方法）では、筒状のパリソンではなく、最初から板状（シート状）の多層シート１０，１０を用意する。 <Modification 1>
6 is a diagram showing Modification 1. In the manufacturing apparatus for a resin molded product (manufacturing method for a resin molded product) according to Modification 1, plate-shaped (sheet-shaped) multilayer sheets 10, 10 are prepared from the beginning, instead of a cylindrical parison.
　変形例１では、例えば、共押出し多層Ｔダイ法でシート状の多層シート１０を一枚ずつ合計２枚成形する。多層シート１０，１０が図４と同じ層構成となるように張り合わせつつ、搬送部４Ａ，４Ａで保持する。保持する際には、ヒーターＨ，Ｈで両側から加熱してもよい。成形工程では、張り合わされた多層シート１０，１０を搬送部４Ａ，４Ａで成形型３に搬送し、成形することができる。 In variant 1, for example, a total of two sheet-like multilayer sheets 10 are molded by a co-extrusion multilayer T-die method. The multilayer sheets 10, 10 are laminated together so that they have the same layer structure as in Figure 4, and are held by conveying sections 4A, 4A. When holding the sheets, they may be heated from both sides by heaters H, H. In the molding process, the laminated multilayer sheets 10, 10 are transported by conveying sections 4A, 4A to the molding die 3, where they can be molded.
＜変形例２＞
　図７は、変形例２を示す図である。変形例２では、成形型４０を用いる。成形型４０は、多層シート１０，１０を真空引きによって成形する。このように、成形工程では、真空引きによって樹脂成形品を成形してもよい。 <Modification 2>
7 is a diagram showing Modification 2. Modification 2 uses a molding die 40. The molding die 40 molds the multilayer sheets 10, 10 by vacuum drawing. In this manner, in the molding process, a resin molded product may be molded by vacuum drawing.
　以上本発明の実施形態及び変形例について説明したが、本発明の趣旨に反しない範囲で適宜設計変更が可能である。例えば、多層シート１０の層構成（樹脂の種類、各層の厚さ等）は、前記したものに限定されるものではなく、適宜設定することができる。 The above describes the embodiments and modifications of the present invention, but the design can be modified as appropriate without departing from the spirit of the present invention. For example, the layer structure of the multilayer sheet 10 (type of resin, thickness of each layer, etc.) is not limited to the above, and can be set as appropriate.
　１　　　樹脂成形品の製造装置
　２　　　ダイヘッド
　３　　　成形型
　３ａ　　第１成形型
　３ｂ　　第２成形型
　４　　　搬送部
　１０　　多層シート
　１１　　主材層
　１２　　第一接着層
　１３　　バリア層
　１４　　第二接着層
　１５　　リサイクル層
　１６　　主材層
　Ｓ　　　パリソン
  Reference Signs List 1 Apparatus for manufacturing resin molded product 2 Die head 3 Mold 3a First mold 3b Second mold 4 Conveyor section 10 Multilayer sheet 11 Main material layer 12 First adhesive layer 13 Barrier layer 14 Second adhesive layer 15 Recycled layer 16 Main material layer S Parison

Claims (4)

  1. 　プラスチック材からなる主材層と、バリア材からなるバリア層と、前記主材層と前記バリア層を接着する第一接着層と、リサイクル材からなるリサイクル層と、前記リサイクル層と前記バリア層を接着する第二接着層と、を有するパリソンを押し出すダイヘッドと、
    　前記パリソンから一対の多層シートが形成されるとともに、一対の前記リサイクル層が一対の前記バリア層の内側となるように張り合わされた状態で所望の形に成形する成形型と、を備えることを特徴とする樹脂成形品の製造装置。     a die head for extruding a parison having a main material layer made of a plastic material, a barrier layer made of a barrier material, a first adhesive layer bonding the main material layer and the barrier layer, a recycled layer made of a recycled material, and a second adhesive layer bonding the recycled layer and the barrier layer;
    a molding die that forms a pair of multilayer sheets from the parison and molds the pair of recycled layers into a desired shape while the pair of recycled layers are bonded together so that they are on the inside of the pair of barrier layers.
  2. 　前記一対の多層シートは、筒状に押し出される前記パリソンをカットすることで形成されることを特徴とする請求項１に記載の樹脂成形品の製造装置。 The apparatus for manufacturing resin molded products according to claim 1, characterized in that the pair of multilayer sheets are formed by cutting the parison extruded into a cylindrical shape.
  3. 　前記パリソンから形成された一対の多層シートを保持するとともに、当該一対の多層シートを互いに反転させ、一対の前記リサイクル層が一対の前記バリア層の内側となるように配置する搬送部を備えることを特徴とする請求項１又は請求項２に記載の樹脂成形品の製造装置。 The manufacturing device for resin molded products according to claim 1 or 2, characterized in that it is provided with a conveying unit that holds a pair of multilayer sheets formed from the parison, and inverts the pair of multilayer sheets with respect to each other, and positions the pair of recycled layers on the inside of the pair of barrier layers.
  4. 　プラスチック材からなる主材層と、バリア材からなるバリア層と、前記主材層と前記バリア層を接着する第一接着層と、リサイクル材からなるリサイクル層と、前記リサイクル層と前記バリア層を接着する第二接着層と、を備える一対の多層シートを準備する準備工程と、
    　一対の前記リサイクル層を一対の前記バリア層の内側に配置した状態で前記多層シート同士を張り合わせ成形型で成形する成形工程と、を備えることを特徴とする樹脂成形品の製造方法。
          A preparation step of preparing a pair of multilayer sheets including a main material layer made of a plastic material, a barrier layer made of a barrier material, a first adhesive layer bonding the main material layer and the barrier layer, a recycled layer made of a recycled material, and a second adhesive layer bonding the recycled layer and the barrier layer;
    A molding process for laminating the multilayer sheets together with a pair of the recycled layers disposed inside a pair of the barrier layers and molding the multilayer sheets in a molding die.
PCT/JP2023/035940 2022-11-21 2023-10-02 Production device and production method for resin molded article WO2024111252A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0999475A (en) * 1995-10-06 1997-04-15 Japan Steel Works Ltd:The Method and apparatus for extrusion molding of multilayered parison and container using multilayered parison
JP2005047303A (en) * 2003-07-29 2005-02-24 Kasai Kogyo Co Ltd Insulator dash for automobile, and method for manufacturing the same
JP2021028167A (en) * 2019-08-09 2021-02-25 株式会社クラレ Multilayer structure and packaging material containing the same

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0999475A (en) * 1995-10-06 1997-04-15 Japan Steel Works Ltd:The Method and apparatus for extrusion molding of multilayered parison and container using multilayered parison
JP2005047303A (en) * 2003-07-29 2005-02-24 Kasai Kogyo Co Ltd Insulator dash for automobile, and method for manufacturing the same
JP2021028167A (en) * 2019-08-09 2021-02-25 株式会社クラレ Multilayer structure and packaging material containing the same

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