Preform, resin-made container, and method for manufacturing the same

Abstract

A preform (10) is disclosed, comprising: an opening (12); a main body (16); and a bottom (18). The preform (10) has a two-layer structure, wherein the main body (16) and the bottom (18) comprise an inner layer (22) made of virgin material and an outer layer (24) made of recycled material, wherein the weight ratio of the recycled material to the total weight of the preform (10) is 50% by weight or more, the ratio of the thickness of the outer layer (24) in the main body (16) to the thickness of the inner layer (22) is 1.5 or more, and the haze of the main body (36) of the container (30) formed from the preform (10) is 1.8% or less.

Description

[0001] This application is a divisional application of the original application with application number 202080049485.7. Technical Field

[0002] This invention relates to preforms, resin containers, and methods for manufacturing preforms and resin containers. Background Technology

[0003] Patent Document 1 discloses a plastic bottle with a two-layer structure, in which the inner layer is made of virgin plastic and the outer layer is made of recycled plastic. Patent Document 2 discloses a method for manufacturing laminated resin molded articles, the method comprising: an outer layer molding process for molding a tubular outer layer material using recycled resin; and an inner layer molding process for laminating and molding a tubular inner layer material using a thinner layer of virgin resin on the inner surface side of the outer layer material.

[0004] Reference List

[0005] Patent documents

[0006] Patent Document 1: JP-2002-103429-A

[0007] Patent Document 2: JP-2002-104362-A Summary of the Invention

[0008] Technical issues

[0009] In recent years, marine pollution caused by plastic waste has been recognized as a serious problem, and international efforts have initiated 3R (Reduce, Reuse, Recycle) measures for plastics. For food / beverage / pharmacy bottles (food containers), a blow molding preform method has been developed. This preform is injection molded into a two-layer structure, with virgin material used for the portion in contact with the contents (inner layer) and recycled material used for the non-contact portion (outer layer). However, using this two-layer molding method, the bottle often exhibits significant haze (turbidity). It is difficult to manufacture bottles with sufficient transparency, and commercialization (practical application) has not progressed.

[0010] The object of the present invention is to provide a preform that can form a resin container having a two-layer structure and high transparency even when the proportion of recycled materials used is large, a resin container having a two-layer structure and high transparency even when the proportion of recycled materials used is large, and a manufacturing method for manufacturing the preform and the resin container.

[0011] Technical solution

[0012] One aspect of the present invention that can solve the above problems is a preform comprising:

[0013] Opening;

[0014] Main body; and

[0015] At the bottom, the prefabricated component has a two-layer structure, comprising an inner layer made of virgin materials and an outer layer made of recycled materials.

[0016] The weight ratio of recycled materials to the total weight of prefabricated components is 50% or more.

[0017] In this case, the ratio of the thickness of the outer layer to the thickness of the inner layer in the main body is 1.5 or more, and

[0018] Among them, the haze of the main body of the container formed from prefabricated parts is 1.8% or less.

[0019] Another aspect of the present invention, which can solve the above problems, is a manufacturing method for manufacturing a preform, the preform including an opening, a main body, and a bottom, the preform having a two-layer structure, wherein the main body and the bottom include an inner layer made of virgin material and an outer layer made of recycled material, the manufacturing method including:

[0020] In the first injection molding process, virgin or recycled material is injected into a first mold to mold an inner or outer layer material; and

[0021] In the second injection molding process, the inner or outer layer material formed in the first injection molding process is contained in a second mold, and recycled material is injected onto the outside of the inner layer material to mold the outer layer material, or virgin material is injected onto the inside of the outer layer material to mold the inner layer material.

[0022] The inner and outer layers are molded such that the weight ratio of the recycled material to the total weight of the preform is 50% or more by weight, and the ratio of the thickness of the outer layer to the thickness of the inner layer in the main body is 1.5 or more.

[0023] Another aspect of the present invention that can solve the above problems is a resin container, the resin container comprising:

[0024] Opening;

[0025] Main body; and

[0026] The resin container has a two-layer structure, comprising an inner layer made of virgin material and an outer layer made of recycled material.

[0027] The weight ratio of recycled materials to the total weight of resin containers is 50% or more.

[0028] In this case, the ratio of the thickness of the outer layer to the thickness of the inner layer in the main body is 1.5 or more, and

[0029] The haze of the main body is 1.8% or less.

[0030] Another aspect of the present invention, which can solve the above problems, is a manufacturing method for manufacturing resin containers, the manufacturing method comprising:

[0031] The injection molding process of the injection preform includes an opening, a main body, and a bottom. The preform has a two-layer structure, wherein the main body and the bottom include an inner layer made of virgin material and an outer layer made of recycled material.

[0032] The temperature regulation process involves adjusting the temperature of the precast components; and

[0033] In the blow molding process, pre-formed parts are blow molded to form resin containers.

[0034] The injection molding process includes:

[0035] In the first injection molding process, virgin or recycled material is injected into a first mold to mold an inner or outer layer material; and

[0036] In the second injection molding process, the inner or outer layer material formed in the first injection molding process is contained in a second mold, and recycled material is injected onto the outside of the inner layer material to mold the outer layer material, or virgin material is injected onto the inside of the outer layer material to mold the inner layer material.

[0037] In the injection molding process, the inner and outer layer materials are molded such that the weight ratio of recycled material to the total weight of the preform is 50% or more by weight, and the ratio of the thickness of the outer layer to the thickness of the inner layer in the main body is 1.5 or more.

[0038] Beneficial effects of the present invention

[0039] According to the present invention, a preform that can form a resin container having a two-layer structure and high transparency even when the proportion of recycled materials used is large, a resin container having a two-layer structure and high transparency even when the proportion of recycled materials used is large, and a manufacturing method for manufacturing the preform and the resin container can be provided. Attached Figure Description

[0040] Figure 1 This is a cross-sectional view illustrating a prefabricated component according to an embodiment.

[0041] Figure 2 This is a cross-sectional view illustrating a resin container according to an embodiment.

[0042] Figure 3 This is a flowchart illustrating the manufacturing process of a preform according to an embodiment.

[0043] Figure 4 This is a cross-sectional view illustrating the injection molding pattern of a preform according to an embodiment.

[0044] Figure 5 This is a cross-sectional view illustrating a mode of a cooling preform according to an embodiment.

[0045] Figure 6 This is a cross-sectional view illustrating another mode of the cooling preform according to an embodiment.

[0046] Figure 7 This is a flowchart illustrating the manufacturing process of a resin container according to an embodiment.

[0047] Figure 8 This is a schematic diagram illustrating a manufacturing apparatus for a resin container according to an embodiment.

[0048] Figure 9 This is a flowchart illustrating the manufacturing process of a resin container according to a modified example of an embodiment.

[0049] Figure 10 This is a schematic diagram illustrating a resin container manufacturing apparatus according to a modified embodiment.

[0050] Figure 11 This is a cross-sectional view illustrating the injection molding pattern of a preform according to a modified example of the embodiment. Detailed Implementation

[0051] Hereinafter, embodiments of the invention will be described with reference to the accompanying drawings. Note that, for ease of description, the dimensions of the various components illustrated in the drawings may differ from the actual dimensions of the components.

[0052] First, refer to Figure 1 Preform 10 is described according to an embodiment. Figure 1 This is a cross-sectional view of preform 10. Preform 10 is a tubular resin molded article comprising: an opening 12; a neck 14 continuous with the opening 12; a body 16 continuous with the neck 14; and a bottom 18 continuous with the body 16. The body 16 and the bottom 18 have a two-layer structure comprising an inner layer 22 and an outer layer 24. The inner layer 22 is made of virgin material, which is unused resin material. The outer layer 24 is made of recycled material prepared by recycling used resin material. As the base material for both the virgin and recycled materials, a thermoplastic resin (crystalline plastic) with transparency in an amorphous state, such as polyethylene terephthalate (PET) resin, is used. Preform 10 is used to mold the resin container 30, which will be described later.

[0053] The weight ratio of recycled material to the total weight of preform 10 is 50% by weight or more. From the viewpoint of resin material recycling rate, this weight ratio is preferably 60% by weight or more, and from the viewpoint of the transparency of the container to be molded, it is preferably 70% by weight or less. The ratio of the thickness th2 of the outer layer 24 to the thickness th1 of the inner layer 22 in the main body 16 is 1.5 or more. From the viewpoint of the transparency of the container to be molded, this ratio is preferably 3.0 or less.

[0054] Gate marks 22a and 24a formed by injection molding exist in the inner layer 22 and outer layer 24 of the bottom 18 of the preform 10, respectively. The height he1 of the gate mark 22a in the inner layer 22 of the bottom 18 is less than the thickness th3 of the outer layer 24.

[0055] Next, refer to Figure 2 Container 30 is described according to an embodiment. Figure 2 This is a cross-sectional view of container 30. Container 30 is a bottle-shaped resin container obtained by blow molding preform 10. Container 30 includes a neck 14 continuous with opening 12, a body portion 36 continuous with neck 14, and a bottom 38 continuous with body portion 36. Similar to preform 10, body portion 36 and bottom 38 have a two-layer structure, which includes an inner layer 42 made of virgin material and an outer layer 44 made of recycled material.

[0056] The weight ratio of the total weight of the recycled material to the container 30 and the ratio of the thickness th12 of the outer layer 44 to the thickness th11 of the inner layer 42 in the main body 36 are the same as the weight ratio of the total weight of the recycled material to the preform 10 and the ratio of the thickness th2 of the outer layer 24 to the thickness th1 of the inner layer 22 in the main body 16, and therefore their descriptions will be omitted.

[0057] The haze of the main body 36 of container 30 is 1.8% or less, more preferably 1.4% or less, and even more preferably 1.0% or less. While not particularly limited, the lower limit of haze can be 0.1%. The haze mentioned here is the average value obtained by measuring any 10 portions of the main body 36. The haze is measured using a haze meter according to "Plastics: Determination of Haze in Transparent Materials (JIS-K7136:2000)". Container 30 is a two-layer resin container with high transparency even with a high percentage of recycled materials, and it achieves a high recycling rate of plastic materials while being highly practical.

[0058] Next, refer to Figures 3 to 6 A method for manufacturing preform 10 is described. Figure 3 This is a flowchart illustrating the manufacturing process of preform 10. Figure 4 This is a diagram illustrating the injection molding pattern of preform 10. Figure 5 and Figure 6This diagram illustrates the cooling pattern after injection molding of preform 10.

[0059] like Figure 3 As shown, the manufacturing method for manufacturing the preform 10 according to this embodiment includes an inner layer material molding process S1 and an outer layer material molding process S2, which are two steps of the injection molding process. Here, reference will be made to... Figure 4 The various processes are described. In the inner layer material molding process S1, virgin material is injected via a first gate 58 into a cavity defined by a first mold 50, which includes a first cavity mold 52, a first injection core mold 54, and a neck mold 56. The first mold 50 includes a first hot runner mold 59. The first hot runner mold 59 has a valve pin 59a that is movable in a flow path toward the first gate 58 through which molten resin material (e.g., molten PET resin at approximately 255°C) flows. That is, the first gate 58 of the first mold 50 is configured as a valve gate. When the virgin material has been filled into the cavity, the mold of the first mold 50 is clamped and held for a predetermined period of time, after which the first mold 50 is opened to allow the inner layer material 60 to be molded. The first cavity mold 52 and the first injection core mold 54 are provided with a circuit (medium flow hole or medium flow groove) through which the cooling medium (fluid) for cooling the inner layer material 60 flows, and the cooling medium is appropriately set in the range of, for example, about 5°C to about 20°C.

[0060] The molded inner layer material 60 is lifted together with the first injection core mold 54 and the neck mold 56, and separated from the first cavity mold 52. Further, the first injection core mold 54 is lifted further and separated from the inner layer material 60. Then, the inner layer material 60 is rotated together with the neck mold 56 while being held by the neck mold 56 by a rotating part (not shown), and the inner layer material 60 is positioned above the second cavity mold 72. In the outer layer material molding process S2, the neck mold 56 holding the inner layer material 60 is clamped onto the second injection core mold 55 and the second cavity mold 72, such that the inner layer material 60 is accommodated in the second mold 70, which includes the second cavity mold 72, the second injection core mold 55, and the neck mold 56. Then, molten recycled material is injected via the second gate 78 onto the portion of the inner layer material 60 on the outside of the cavity defined by the second mold 70. The second mold 70 includes a second hot runner mold 79. The second hot runner mold 79 may have a valve pin that can move toward the second gate 78 in the flow path through which the resin material flows. That is, the second gate 78 of the second mold 70 may be configured as a valve gate. When the recycled material is filled into the cavity, the mold of the second mold 70 is clamped and held for a predetermined period of time, after which the second mold 70 is opened to form a preform 10 including an outer layer material 80 and an inner layer material 60. In this embodiment, the inner layer material forming process S1 of the next preform 10 is performed during the outer layer material forming process S2 of the previous preform 10. In addition, a circuit for cooling medium to flow through the second cavity mold 72 and the second injection core mold 55 for cooling the outer layer material 80 and the inner layer material 60 is provided, and the cooling medium is appropriately set in the range of, for example, about 5°C to about 20°C. Note that the temperature (i.e., cooling intensity) of the cooling medium may be different in the first mold 50 and the second mold 70 (for example, the temperature of the cooling medium in the second mold 70 is set to be lower than the temperature of the cooling medium in the first mold 50). Furthermore, even in the second mold 70, the cooling intensity can be different in the second cavity mold 72 and the second injection core mold 55 (for example, the temperature of the cooling medium in the second cavity mold 72 is set to be lower than the temperature of the cooling medium in the second injection core mold 55).

[0061] In the inner layer material forming process S1 and the outer layer material forming process S2, the inner layer material 60 and the outer layer material 80 are formed using a first mold 50 and a second mold 70. The first and second molds are designed such that the weight ratio of the recycled material (outer layer material 80) to the total weight of the preform 10 is 50% by weight or more, and the ratio of the thickness of the outer layer 24 (outer layer material 80) in the main body 16 of the preform to the thickness of the inner layer 22 (inner layer material 60) is 1.5 or more. Here, the length le1 of the first gate 58 in the first mold 50 is less than the thickness th3 of the outer layer 24 (outer layer material 80) in the bottom 18 of the preform 10.

[0062] When the manufacturing method for manufacturing the preform 10 according to this embodiment includes a cooling process S3 for cooling the preform after the outer layer material molding process S2, the cooling time of the injection molding process can be shortened, which is preferred from the viewpoint of production efficiency. Figure 3 The cooling process S3 mentioned here does not include the process of cooling the preform 10 using the second mold 70 while the second mold 70 is held in mold clamping. Reference will be made here. Figure 5 and Figure 6 Describe the mode of cooling process S3.

[0063] Figure 5 This is a diagram illustrating the mode states of the cooling process S3. Figure 5 In the illustrated cooling process S3, the preform 10 released from the second mold 70 is housed in the third cavity mold 100, and the air inlet member 110 is brought into airtight contact with the preform 10. The air inlet member 110 includes a hollow rod member 112 with internal airflow holes and an assembly core (blown core member) 114. The rod member 112 is housed inside the assembly core 114 so as to be movable up and down. An internal flow port 116 is provided at the end of the rod member 112 through which air can be injected or drawn. The temperature of the air is appropriately set in the range of, for example, from about 0°C to about 20°C (room temperature) depending on the thickness of the preform 10 or the container 30. The assembly core 114 is configured to assemble into (closely contact with) the neck 14 when the air inlet member 110 is inserted into the preform 10 (when the air inlet member 110 is in airtight contact with the preform 10). Therefore, air leakage from the neck 14 to the outside of the assembly core 114 within the preform 10 can be prevented. The gap between the rod member 112 and the assembly core 114 is an airflow path for supplying and discharging air to and from the preform 10. The gap formed by the end of the assembly core 114 and the rod member 112 constitutes an outer flow port 118 through which air can be injected or drawn. The inner flow port 116 and the outer flow port 118 can be an air inlet and an outlet, respectively. For example, air is supplied to the preform 10 from the air inlet of the air inlet member 110, and air is discharged to the outside of the preform 10 from the outlet of the air inlet member 110, thereby cooling the preform 10. In addition, a circuit for a cooling medium for cooling the outer layer material 80 is provided in the third cavity mold 100, and the fluid medium is appropriately set in a range of, for example, from about 5°C to about 80°C, more preferably from 10°C to 70°C, and even more preferably from 20°C to 65°C.

[0064] Figure 6 This diagram illustrates another mode of the cooling process S3. Figure 6In the illustrated cooling process S3, the preform 10 released from the second mold 70 is housed in the fourth cavity mold 120, and the preform 10 is sandwiched between the fourth cavity mold 120 and the core mold 130, which is configured to move vertically, thereby cooling the preform 10. The fourth cavity mold 120 and the core mold 130 are also provided with a circuit through which a cooling medium is set in a range of, for example, from about 5°C to about 80°C, more preferably from 10°C to 70°C, and even more preferably from 20°C to 65°C.

[0065] Next, refer to Figures 4 to 7 A manufacturing method for manufacturing container 30 is described. Figure 7 This is a diagram illustrating the manufacturing process of container 30. (As shown...) Figure 7 For example, the manufacturing method for manufacturing container 30 according to this embodiment includes an injection molding process S11 of injection molding preform 10, a temperature adjustment process S12 of adjusting the temperature of preform 10, and a blow molding process S13 of blow molding preform 10 to form container 30.

[0066] First, the injection molding process S11 will be described. The injection molding process S11 includes an inner layer material molding process S1 and an outer layer material molding process S2, as described in the manufacturing method for manufacturing the preform 10. In the injection molding process S11, as described in the inner layer material molding process S1 and the outer layer material molding process S2 of the preform 10, the inner layer material 60 and the outer layer material 80 are molded such that the weight ratio of the recycled material (outer layer material 80) to the total weight of the preform 10 is 50% by weight or more, and the ratio of the thickness of the outer layer 24 (outer layer material 80) in the main body portion 16 of the preform to the thickness of the inner layer 22 (inner layer material 60) is 1.5 or more. The first mold 50 used in the inner layer material molding process S1, the second mold 70 used in the outer layer material molding process S2, and other patterns employed in the injection molding process S11 are consistent with those in the manufacturing method for the preform 10. Figure 4 Those described in ) are similar, so their descriptions will be omitted.

[0067] Next, the temperature conditioning process S12 will be described. The temperature conditioning process S12 is the process of adjusting the temperature of the injection-molded preform 10 to a temperature range suitable for blow molding. In the temperature conditioning process S12, the temperature of the preform 10 is adjusted by using a temperature conditioning chamber, a temperature conditioning core, an infrared heater, etc. Furthermore, in the temperature conditioning process S12, the mode described in the cooling process S3 of the manufacturing method for the preform 10 can be adopted (…). Figure 5 and Figure 6 Furthermore, the temperature can be adjusted while cooling the preform. When the temperature adjustment process S12 adopts the mode described in the cooling process S3 of the manufacturing method for the preform 10, the production efficiency of the container 30 is improved, which is preferred. In particular, when described later... Figure 8When the preform 10 and container 30 are continuously manufactured in the hot preform manufacturing apparatus for the resin container shown, the production efficiency of container 30 is improved, which is preferable. However, when continuously injection molding and blow molding of two layers of preforms using the hot preform blow molding method, the boundary between the inner layer 22 and the outer layer 24 may not cool sufficiently (gradually cool), potentially increasing haze. However, when the mode described in the cooling process S3 is used in the temperature conditioning process S12 (…),… Figure 5 and Figure 6 When the cooling process S3 is used in the temperature regulation process S12, the temperature of the cooling medium flowing through the third cavity mold 100, the fourth cavity mold 120 and the core mold 130 is appropriately set in a wide range, for example, from about 10°C to about 65°C.

[0068] Next, the blow molding process S13 will be described. In the blow molding process S13, the preform 10 is housed in a blow molding cavity mold. Subsequently, while the preform 10 is optionally stretched by a tension rod, blown air is introduced from the blow molding core mold to inflate the preform 10 into the shape of the container 30, thereby manufacturing the container 30. The container 30 is then released from the mold. The container is manufactured according to the above process.

[0069] Here, we will refer to Figure 8 The manufacturing apparatus 150 of the container 30 according to this embodiment is described. Figure 8 This is a functional block diagram of the manufacturing apparatus 150 for container 30. The manufacturing apparatus 150 includes an injection molding section 152 for manufacturing a preform 10, a temperature regulating section 154 for adjusting the temperature of the manufactured preform 10, a blow molding section (example of a blow molding apparatus) 156 for blowing the preform 10 to manufacture container 30, and a take-out section 158 for removing the manufactured container 30. In the manufacturing apparatus 150, the preform 10 and container 30 are conveyed via a transfer section (not shown) in the order of injection molding section 152, temperature regulating section 154, blow molding section 156, and take-out section 158. The injection molding section 152, temperature regulating section 154, and blow molding section 156 adopt the configuration described in the manufacturing methods for preform 10 and for container 30. Figures 4 to 6 The manufacturing apparatus 150 is a hot preform manufacturing apparatus for resin containers, and continuously manufactures the preform 10 and the container 30.

[0070] Meanwhile, during the international implementation of the 3Rs (Recycling, Reuse, Reuse) for plastics, various recycling measures were adopted, with the ultimate goal of "bottle-to-bottle" recycling, even in the field of PET containers. For example, detergent / toner PET bottles (non-food containers) are typically manufactured using scrap material obtained by crushing used PET bottles or a mixture of recycled pellets and virgin materials. On the other hand, food / beverage / pharmaceutical PET bottles (food containers) are manufactured using virgin materials, with very little recycled material used. This is because such PET bottles require a high level of hygiene and safety. Therefore, a method for blow molding preforms has been developed, in which the preform is injection molded into an inner and outer two-layer structure, where virgin material is used for the part that comes into contact with the contents (inner layer), while recycled material is used for the non-contact parts (outer layer).

[0071] However, using the two-layer molding method in related technologies often results in high bottle haze (turbidity). It is difficult to manufacture bottles with sufficient transparency, and commercialization (practical application) has not progressed. Furthermore, even when using mixed materials, considering bottle transparency, the proportion (by weight) of recycled pellet material is limited to a maximum of approximately 30% by weight, and further improvements are needed.

[0072] Based on the preform 10 having the above-described structure, a resin container 30 with a two-layer structure and high transparency can be formed, even when the proportion of recycled material used is high. Specifically, a resin container with transparency comparable to that formed from a container made of a two-layer preform containing 30% by weight of recycled pellet material can be formed.

[0073] Furthermore, in the preform 10, since the height “he1” of the gate mark 22a is less than the thickness “th3” of the outer layer 24 in the bottom 18, the melting and mixing of the virgin material with the recycled material during injection can be suppressed. Therefore, a preform 10 can be provided in which whitening of its bottom 18 can be suppressed, and a resin container 30 with a two-layer structure and high transparency can be formed from the preform.

[0074] Furthermore, recycled materials have a higher crystallization rate than virgin materials and may whiten. To suppress whitening of recycled materials, an inner layer material 60 made of virgin material is first molded, followed by an outer layer material 80 made of recycled material. However, it was found that due to the injection of recycled material, the virgin material is reheated within a temperature range where the virgin material may crystallize and gradually cool (e.g., approximately 150°C in the case of PET resin), and whitening (crystallization) may occur at the interface between the virgin and recycled materials. Therefore, by reducing the weight ratio of virgin material to the total weight of the preform 10 and reducing the thickness of the inner layer 22 relative to the outer layer 24, the cooling efficiency of the inner layer 22 by the first mold 50 and the second mold 70 (second injection core mold 55) is increased, making it possible to successfully suppress whitening at the interface between the virgin and recycled materials. That is, according to the manufacturing method described above for manufacturing the preform 10, an inner layer material 60 made of virgin material is formed, followed by an outer layer material 80 made of recycled material. The inner layer material 60 and the outer layer material 80 are formed such that the weight ratio of recycled material to the total weight of the preform 10 is 50% by weight or more, and the ratio of the thickness th2 of the outer layer 24 to the thickness th1 of the inner layer 22 in the main body 16 is 1.5 or more. Therefore, a preform 10 can be provided that can form a resin container 30 with a two-layer structure and high transparency even when the proportion of recycled material used is high.

[0075] Furthermore, in the manufacturing method described above for manufacturing the preform 10, since the length le1 of the first gate 58 for injecting the virgin material is less than the thickness th3 of the outer layer 24 in the bottom 18, the height he1 of the gate mark 22a formed in the inner layer material 60 is reduced, and the virgin material can be prevented from melting and mixing with the recycled material during injection. Therefore, a preform 10 can be provided in which whitening caused by crystallization or the like in its bottom 18 can be suppressed, and a resin container 30 with a two-layer structure and high transparency can be formed from the preform.

[0076] Furthermore, in the manufacturing method described above for manufacturing preform 10, since a cooling process S3 is provided to cool the preform 10 after the outer layer material molding process S2, the cooling time of the preform 10 during injection molding can be shortened. Therefore, the molding of the next preform 10 can begin during the cooling period of the preform 10, thereby improving production efficiency.

[0077] Furthermore, since the preform 10 is cooled by introducing and discharging air during the cooling process S3 of the manufacturing method described above, the cooling of the preform 10 can be accelerated. Therefore, a preform 10 can be provided that can form a resin container 30 with a two-layer structure and better transparency, while improving the production efficiency of the preform 10.

[0078] Furthermore, since the preform 10 is sandwiched between the fourth cavity mold 120 and the core mold 130 during the cooling process S3 of the manufacturing method for the preform 10 described above, the cooling of the preform 10 can be accelerated. Therefore, a preform 10 can be provided that can form a resin container 30 with a two-layer structure and better transparency, while improving the production efficiency of the preform 10.

[0079] Furthermore, according to the manufacturing method for the container 30 described above, the outer layer material 80 of the preform 10 is formed after the inner layer material 60 of the preform 10 is formed. The inner layer material 60 and the outer layer material 80 of the preform 10 are formed such that the weight ratio of recycled material to the total weight of the preform 10 is 50% or more, and the ratio of the thickness th2 of the outer layer 24 to the thickness th1 of the inner layer 22 in the main body 16 is 1.5 or more. Therefore, a container 30 with a two-layer structure and high transparency can be provided, even when the proportion of recycled material used is high. In addition, regarding the hot-form preform two-layer molding method in related technologies, commercialization (practical application) has not progressed because the haze of the container tends to increase, and it is difficult to manufacture bottles with sufficient transparency. According to the method described above, particularly in the hot-form preform two-layer molding method, a container 30 with a two-layer structure and high transparency can be provided, even when the proportion of recycled material used is high.

[0080] Furthermore, since the injection molding process S11 and the temperature conditioning process S12 in the above-mentioned manufacturing method for manufacturing container 30 adopt the mode described in the manufacturing method for manufacturing preform 10, a resin container with a two-layer structure and better transparency can be formed, the container molding cycle time can be shortened, and production efficiency can be improved.

[0081] Although the above embodiments describe a mode in which the outer layer material forming process S2 is performed after the inner layer material forming process S1, the present invention is not limited to this mode. Figure 9 This is a flowchart illustrating the manufacturing process of a resin container according to a modified example of the above embodiments. Figure 9As shown, the first injection molding process S31, the first temperature regulation process S32, the second injection molding process S33, the second temperature regulation process S34, and the blow molding process S35 can be executed in this sequence to manufacture resin containers. When molding preforms, the first injection molding process S31, the first temperature regulation process S32, the second injection molding process S33, and the second temperature regulation process S34 can be executed in this sequence.

[0082] In this modified example, the first injection molding process S31 is the process of molding either the inner layer material or the outer layer material of the preform, and the second injection molding process S33 is the step of molding the one of the inner layer material and the outer layer material of the preform that was not molded in the first injection molding process S31 to form the preform. The first temperature conditioning process S32 is the process of adjusting the temperature of the inner layer material or the outer layer material of the preform molded in the first injection molding process S31. The first temperature conditioning process S32 may be a step of cooling the inner layer material or the outer layer material of the preform. In the first temperature conditioning process S32 between the first injection molding process S31 and the second injection molding process S33, the inner layer material or the outer layer material of the preform molded first is post-cooled (in particular, the surface of the resin material to be laminated in the second injection molding process S33 is post-cooled), so that the haze of the two-layer preform can be reduced (by suppressing whitening at the interface between the inner layer material and the outer layer material) and the molding cycle can be shortened. The second temperature conditioning process S34 is the process of conditioning the temperature of the preform molded in the second injection molding process S33. The second temperature conditioning process S34 may be a process of cooling the preform. The blow molding process S35 is the process of blow molding the preform whose temperature has been conditioned in the second temperature conditioning process S34 to obtain a resin container.

[0083] Figure 10 This is a schematic diagram illustrating a modified example of a resin container manufacturing apparatus 350 according to the above embodiment. Figure 10 For example, the manufacturing apparatus 350 is a six-workbench type manufacturing apparatus, which includes: a first injection molding section 352 including a first injection device 362; a first temperature control section 354; a second injection molding section 353 including a second injection device 363; a second temperature control section 355; a blow molding section 356; and a take-out section 358. In the manufacturing apparatus 350, a preform and a resin container are conveyed in the direction of the arrow shown in the figure by a conveying device 370 including a rotary table, etc., and the preform and the resin container are molded according to the above-described manufacturing process. As a specific model of the workbench, the model of the above embodiment can be appropriately adopted.

[0084] Although the above embodiments describe a two-step injection molding process including performing an outer layer material molding process S2 after an inner layer material molding process S1, a process in which the outer layer material is molded first, followed by the molding of the inner layer material, can also be used. Hereinafter, reference will be made to... Figure 11 A modification example of this embodiment is described. Figure 11 This is a cross-sectional view illustrating the injection molding pattern of a preform 210 according to a modified example of the above embodiment.

[0085] In the following description, this modified example will be based on a manufacturing apparatus for molding a preform 210 and molding a resin container from the preform 210. The manufacturing apparatus according to this modified example is similar to the manufacturing apparatus 150 and manufacturing apparatus 350 described in the above embodiments and modifications, except for the different structure of the injection molding section. The injection molding section of the manufacturing apparatus of this modified example includes a first mold 250 for molding an outer layer material 280 and a second mold 270 for molding an inner layer material 260 on the inner side of the outer layer material 280 (see...). Figure 11 ).

[0086] The first mold 250 includes a first cavity mold 252, a first injection core mold 254, and a neck mold 256. The first mold 250 is configured to form an outer layer material 280 by pouring recycled material into a cavity defined by the mold clamping of these molds. The recycled material is supplied from a first hot runner mold 259 and poured into the cavity via a first gate 258.

[0087] The first hot runner mold 259 has a valve pin 259a that can move toward the first gate 258 in the flow path through which the recycled material flows. The valve pin 259a is configured to move through the first gate 258 to a position near the first injection core mold 254 after the recycled material is filled into the cavity. Therefore, a thin film portion 281 with a thickness less than that of the peripheral portion is formed in the central portion of the bottom of the outer layer material 280.

[0088] The second mold 270 includes a second cavity mold 272, a second injection core mold 255, and a neck mold 256. The neck mold 256 is a shared neck mold that moves to the position of the second mold 270 while holding the outer layer material 280 formed by the first mold 250. The core diameter of the second injection core mold 255 is smaller than the core diameter of the first injection core mold 254, which is also smaller than the layer thickness of the inner layer material 260. Furthermore, the size (diameter) of the recess in the top view of the second cavity mold 272 is the same as the size (diameter) of the recess in the top view of the first cavity mold 252. The second mold 270 is configured to form the inner layer material 260 on the inside of the outer layer material 280 formed by the first mold 250 by pouring raw material into the cavity defined by the mold clamping of these molds.

[0089] The virgin material is supplied from the second hot runner mold 279 and poured into the cavity through the second gate 278. The thin film 281 formed in the outer layer material 280 ruptures due to the flow of the virgin material, thereby pouring the virgin material into the cavity. When the thin film 281 of the outer layer material 280 ruptures, an opening 282 is formed at the bottom 218 of the preform 210 (the bottom of the outer layer material 280). The virgin material poured into the cavity fills the cavity through the opening 282.

[0090] In this modified example, a two-step injection molding process is employed. First, an outer layer material molding process is performed whereby the outer layer material 280 is formed by the first mold 250. Then, an inner layer material molding process is performed whereby the inner layer material 260 is formed inside the outer layer material 280 by the second mold 270. In this modified example, the preform 210 is molded such that the weight ratio of the recycled material to the total weight of the preform 210 formed through the two-step injection molding process, and the ratio of the outer layer thickness to the inner layer thickness in the main body, are similar to those in the embodiments described above. Furthermore, in this modified example, the container is molded such that the haze of the main body of the container formed from the preform 210 is similar to the haze in the embodiments described above.

[0091] In this modified example, the method of performing the outer layer material forming process S2 after the inner layer material forming process S1 (see [reference]). Figure 7 Unlike the first injection molding process, no gate marks are formed in the outer layer material 280 (recycled material) that is first molded in the first injection molding process. Therefore, the likelihood of the virgin and recycled materials melting and mixing in the bottom region of the preform 210 is further reduced, and whitening (crystallization, etc.) at the bottom can be more reliably suppressed. The injection volume of the inner layer material 260 (virgin material) injected in the second injection molding process is less than the injection volume of the outer layer material 280 (recycled material) injected in the first injection molding process, and the degree of reheating of the first-molded outer layer material 280 is also reduced. Therefore, whitening (crystallization) at the interface between the virgin and recycled materials is less likely to occur. Therefore, in this modified example, it is easier to manufacture and provide a preform 210 that can form a resin container with a two-layer structure and high transparency.

[0092] This modification example is preferred. Figure 9 Manufacturing method and Figure 10The manufacturing process is carried out in the manufacturing apparatus 350. This is because the thick outer layer material 280 of the preform 210, made of recycled material, is cooled not only in the first injection molding process S31 (first mold 250) but also in the first temperature conditioning process S32 (first temperature conditioning unit 354) (post-cooling). Therefore, the thick outer layer material 280 of the preform 210 can be sufficiently cooled to reduce its temperature, thereby suppressing the temperature rise (reheating) of the outer layer material 280 caused by the injection of virgin material in the second injection molding process S33 (second mold 270). Therefore, the whitening of the preform 210 can be further reduced, and a container with a lower haze value can be manufactured.

[0093] Example

[0094] Hereinafter, examples of this embodiment will be described. Note that the technical scope of the present invention is not limited to this example. The technical scope of the present invention is defined by the claimed scope or its equivalents.

[0095] Manufacturing experiments of resin containers with two-layer structures, as described in Examples 1, 2, and 3, were conducted by using the manufacturing apparatus 150 described in this embodiment and changing the resin material used in the injection molding of the preform.

[0096] The container in Example 1 is composed of having Figure 1 The preform shown comprises an inner layer made of virgin PET material (BK-2180, manufactured by Mitsubishi Chemical Co., Ltd.) and an outer layer made of recycled PET material (LCG-1810, manufactured by PET One Co., Ltd., Mexico). The weight ratio of virgin material to total weight is 38%, and the weight ratio of recycled material to total weight is 62%. The thickness of the inner layer in the preform body is 1.8 mm, and the thickness of the outer layer in the preform body is 2.98 mm.

[0097] The container in Example 2 is composed of having Figure 1 The preform shown comprises an inner and outer layer made of a mixture of virgin and recycled materials (a mixture of BK-2180 manufactured by Mitsubishi Chemical Co., Ltd. and LCG-1810 manufactured by PET One Co., Ltd. of Mexico), wherein the recycled material accounts for 30% of the total weight. The virgin material accounts for 70% of the total weight. The inner layer in the preform body has a thickness of 1.8 mm, and the outer layer in the preform body has a thickness of 2.98 mm.

[0098] The container in Example 3 is composed of having Figure 1The preform shown comprises an inner layer and an outer layer made of recycled material (LCG-1810, manufactured by PET One Ltd., Mexico). The inner layer in the main body of the preform has a thickness of 1.8 mm, and the outer layer in the main body of the preform has a thickness of 2.98 mm.

[0099] The haze of the main body of the containers in Examples 1 to 3 was measured using a haze meter (NDH-300, manufactured by Nippon Denshoku Industries, Ltd.). The average values ​​obtained by measuring any 10 portions of the main body of the containers in Examples 1 to 3 were 1.74%, 1.75%, and 2.69%, respectively. When the thickness of the main body was set to 0.5 mm, the haze values ​​in Examples 1 to 3 were 1.36%, 1.49%, and 2.13%, respectively. It was found that the haze of the containers in Examples 1 and 2 was lower than that of the container in Example 3, which used only recycled materials, and the transparency was good. In addition, it was found that even though the ratio of recycled materials used in the container of Example 1 was higher than that in the container of Example 2, the container of Example 1 exhibited a haze value comparable to that of the container of Example 2, and the container of Example 1 had excellent transparency while having a high recycling rate.

[0100] This invention is not limited to the above embodiments, and can be appropriately modified or improved. The material, shape, size, value, form, quantity, and arrangement of the components in the above embodiments are optional and not limited, as long as they can realize this invention.

[0101] For example, although the above embodiments describe a mode in which virgin and recycled materials use PET resin as a substrate, materials using PE resin, PP resin, etc., as substrates can also be used. However, in the mode of this embodiment, PET resin is preferred.

[0102] The following section will list aspects extracted from the above embodiments and their modifications.

[0103] [1] A precast component, comprising:

[0104] Opening;

[0105] Main body; and

[0106] bottom,

[0107] The prefabricated component has a two-layer structure, wherein the main body and bottom consist of an inner layer made of virgin materials and an outer layer made of recycled materials.

[0108] The weight ratio of recycled materials to the total weight of prefabricated components is more than 50% by weight.

[0109] In particular, the ratio of the thickness of the outer layer to the thickness of the inner layer in the main body is 1.5 or more.

[0110] Furthermore, the haze of the main body of the container formed from prefabricated parts is less than 1.8%.

[0111] [2] Based on the prefabricated parts in [1],

[0112] The height of the gate mark in the inner layer at the bottom is less than the thickness of the outer layer at the bottom.

[0113] [3] A manufacturing method for a preform, the preform comprising an opening, a main body, and a bottom, the preform having a two-layer structure, wherein the main body and the bottom comprise an inner layer made of virgin material and an outer layer made of recycled material, the manufacturing method comprising:

[0114] In the first injection molding process, virgin or recycled materials are injected into the first mold to mold the inner or outer layer material.

[0115] The second injection molding process involves accommodating the inner or outer layer material formed in the first injection molding process in a second mold, and injecting recycled material onto the outside of the inner layer material to mold the outer layer material, or injecting virgin material onto the inside of the outer layer material to mold the inner layer material.

[0116] The inner and outer layers are molded such that the weight ratio of recycled material to the total weight of the preform is 50% or more, and the ratio of the thickness of the outer layer to the thickness of the inner layer in the main body is 1.5 or more.

[0117] [4] The manufacturing method for manufacturing preforms according to [3]

[0118] The first injection molding process involves injecting virgin material into the first mold to form the inner layer material.

[0119] Furthermore, the second injection molding process involves accommodating the inner layer material in a second mold and injecting recycled material onto the outside of the inner layer material to form the outer layer material.

[0120] [5] According to the manufacturing method for manufacturing preforms in [4],

[0121] In the first mold, the length of the gate for injecting virgin material is less than the thickness of the outer layer at the bottom of the preform.

[0122] [6] According to the manufacturing method for manufacturing preforms in [3],

[0123] The first injection molding process involves injecting recycled material into the first mold to form the outer layer material.

[0124] Furthermore, the second injection molding process involves accommodating the outer layer material in the second mold and injecting the virgin material into the inner side of the outer layer material to form the inner layer material.

[0125] [7] The manufacturing method for manufacturing preforms according to any one of [3] to [6] further includes:

[0126] The cooling process involves cooling the preform after the second injection molding process.

[0127] [8] The manufacturing method for manufacturing preforms according to [7],

[0128] During the cooling process,

[0129] The prefabricated component is housed in the cavity mold.

[0130] This allows air to be introduced into the component and the precast part to come into airtight contact.

[0131] The preform is cooled by introducing air into the preform from the air inlet of the air inlet component and discharging air to the outside of the preform from the outlet of the air inlet component.

[0132] [9] According to the manufacturing method for manufacturing preforms in [7],

[0133] During the cooling process, the preform is cooled by clamping it between the cavity mold and the core mold.

[0134]

[10] The manufacturing method for manufacturing preforms according to any one of [3] to [6] further includes:

[0135] The first cooling process cools the inner or outer layer material after the first injection molding process.

[0136] And a second cooling process, which cools the preform after the second injection molding process.

[0137]

[11] According to the manufacturing method for manufacturing preforms in

[10] ,

[0138] In the first cooling process and the second cooling process...

[0139] The prefabricated component is housed in the cavity mold.

[0140] This allows air to be introduced into the component and the precast part to come into airtight contact.

[0141] The preform is cooled by introducing air into the preform from the air inlet of the air inlet component and discharging air to the outside of the preform from the outlet of the air inlet component.

[0142]

[12] According to the manufacturing method for manufacturing preforms in

[10] ,

[0143] In the first and second cooling processes, the preform is cooled by clamping it between the cavity mold and the core mold.

[0144]

[13] A resin container, comprising:

[0145] Opening;

[0146] Main body;

[0147] And the bottom,

[0148] The resin container has a two-layer structure, comprising an inner layer made of virgin material and an outer layer made of recycled material.

[0149] The weight ratio of recycled materials to the total weight of resin containers is more than 50% by weight.

[0150] In this part, the ratio of the thickness of the outer layer to the thickness of the inner layer in the main body is 1.5 or more, and

[0151] The haze of the main body is below 1.8%.

[0152]

[14] A method for manufacturing a resin container, the method comprising:

[0153] The injection molding process of the injection preform includes an opening, a main body, and a bottom. The preform has a two-layer structure, wherein the main body and the bottom include an inner layer made of virgin material and an outer layer made of recycled material.

[0154] The temperature regulation process involves adjusting the temperature of the precast components.

[0155] And the blow molding process, which involves blow molding preforms to form resin containers.

[0156] The injection molding process includes:

[0157] In the first injection molding process, virgin or recycled materials are injected into the first mold to mold the inner or outer layer material.

[0158] The second injection molding process involves accommodating the inner or outer layer material formed in the first injection molding process in a second mold, and injecting recycled material onto the outside of the inner layer material to mold the outer layer material, or injecting virgin material onto the inside of the outer layer material to mold the inner layer material.

[0159] Furthermore, during the injection molding process, the inner and outer layer materials are molded such that the weight ratio of recycled material to the total weight of the preform is 50% or more, and the ratio of the thickness of the outer layer to the thickness of the inner layer in the main body is 1.5 or more.

[0160]

[15] The manufacturing method for manufacturing resin containers according to

[14] ,

[0161] The first injection molding process involves injecting virgin material into the first mold to form the inner layer material.

[0162] Furthermore, the second injection molding process involves accommodating the inner layer material in a second mold and injecting recycled material onto the outside of the inner layer material to form the outer layer material.

[0163]

[16] According to the manufacturing method of

[15] for manufacturing resin containers,

[0164] In the first mold, the length of the gate for injecting virgin material is less than the thickness of the outer layer at the bottom of the preform.

[0165]

[17] The manufacturing method for manufacturing resin containers according to

[14]

[0166] The first injection molding process involves injecting recycled material into a first mold to form the outer layer material.

[0167] The second injection molding process involves accommodating the outer layer material in a second mold and injecting the virgin material into the inner side of the outer layer material to form the inner layer material.

[0168]

[18] A manufacturing method for making a resin container according to any one of

[14] to

[17]

[0169] Among them, the preforms formed during the injection molding process are cooled during the temperature regulation process.

[0170]

[19] According to the manufacturing method of

[18] for manufacturing resin containers,

[0171] During the temperature regulation process,

[0172] The prefabricated component is housed in the cavity mold.

[0173] This allows air to be introduced into the component and the precast part to come into airtight contact.

[0174] The preform is cooled by introducing air into the preform from the air inlet of the air inlet component and discharging air to the outside of the preform from the outlet of the air inlet component.

[0175]

[20] According to the manufacturing method of

[18] for manufacturing resin containers,

[0176] During the temperature regulation process, the preform is cooled by clamping it between the cavity mold and the core mold.

[0177]

[21] A manufacturing method for making a resin container according to any one of

[14] to

[17]

[0178] The temperature regulation process includes a first temperature regulation process and a second temperature regulation process.

[0179] The first temperature regulation process is the process of cooling the inner or outer layer material after the first injection molding process.

[0180] Furthermore, the second temperature regulation process is the process of cooling the preform after the second injection molding process.

[0181]

[22] According to the manufacturing method of

[21] for manufacturing resin containers,

[0182] In the first cooling process and the second cooling process...

[0183] The prefabricated component is housed in the cavity mold.

[0184] This allows air to be introduced into the component and the precast part to come into airtight contact.

[0185] The preform is cooled by introducing air into the preform from the air inlet of the air inlet component and discharging air to the outside of the preform from the outlet of the air inlet component.

[0186]

[23] According to the manufacturing method for resin containers of

[21] ,

[0187] In the first and second cooling processes, the preform is cooled by clamping it between the cavity mold and the core mold.

[0188] This application is based on Japanese Patent Application No. 2019-109558, filed on June 12, 2019, the entire contents of which are incorporated herein by reference. Furthermore, all references listed herein are also incorporated herein by reference.

[0189] List of reference numerals

[0190] 10, 210: Precast part; 12: Opening; 14: Neck; 16: Main body; 18, 218: Bottom; 22: Inner layer; 24: Outer layer; 22a, 24a: Gate mark; 30: Container; 36: Main body; 38: Bottom; 42: Inner layer; 44: Outer layer; 50, 250: First mold; 52, 252: First cavity mold; 54, 254: First injection core mold; 55, 255: Second injection core mold; 56, 256: Neck mold; 58, 258: First gate; 59, 259: First hot runner mold; 59a, 259a: Valve pin; 60, 260: Inner layer material; 70, 270: Second mold. 72, 272: Second cavity mold; 78, 278: Second gate; 79, 279: Second hot runner mold; 80, 280: Outer layer material; 282: Opening; 100: Third cavity mold; 110: Air introduction component; 120: Fourth cavity mold; 130: Core mold; 150, 350: Manufacturing device; 152: Injection section; 154: Temperature control section; 156, 356: Blow molding section; 158, 358: Removal section; 352: First injection section; 353: Second injection section; 354: First temperature control section; 355: Second temperature control section; 362: First injection device; 363: Second injection device; 370: Conveying device.

Claims

1. A precast component, characterized in that, include: Opening; Main body; as well as bottom, The prefabricated component has a two-layer structure, wherein the main body and the bottom comprise an inner layer made of virgin material and an outer layer made of recycled material. The substrate of the virgin material and the substrate of the recycled material are both polyethylene terephthalate resin. Wherein, the ratio of the thickness of the outer layer to the thickness of the inner layer in the main body is 1.5 or more and 3.0 or less, and The haze of the main body of the container formed from the preform is less than 1.8%.

2. The prefabricated component according to claim 1, wherein, The height of the gate mark in the inner layer of the bottom is less than the thickness of the outer layer of the bottom.

3. A manufacturing method for manufacturing a preform, characterized by, The preform includes an opening, a main body, and a bottom. The preform has a two-layer structure, wherein the main body and the bottom comprise an inner layer made of virgin material and an outer layer made of recycled material. The manufacturing method includes: In the first injection molding process, the virgin material or the recycled material is injected into a first mold to injection mold an inner layer material or an outer layer material; and In the second injection molding process, the inner layer material or the outer layer material formed in the first injection molding process is housed in a second mold, and the recycled material is injected onto the outside of the inner layer material to injection mold the outer layer material, or the virgin material is injected onto the inside of the outer layer material to injection mold the inner layer material. The substrate of the virgin material and the substrate of the recycled material are both polyethylene terephthalate resin. The inner layer material and the outer layer material are molded such that the ratio of the thickness of the outer layer to the thickness of the inner layer in the main body is 1.5 or more and 3.0 or less. The preform is used to mold a resin container, and The haze of the main body of the container is less than 1.8%.

4. The manufacturing method for preforms according to claim 3, wherein The first injection molding process is a process of injecting the virgin material into the first mold to mold the inner layer material. The second injection molding process involves accommodating the inner layer material in the second mold and injecting the recycled material onto the outside of the inner layer material to form the outer layer material.

5. The manufacturing method for producing preforms according to claim 4, wherein, The length of the gate in the first mold for injecting the virgin material is less than the thickness of the outer layer in the bottom of the preform.

6. The manufacturing method for producing preforms according to claim 3, in, The first injection molding process is a process of injecting the recycled material into the first mold to mold the outer layer material, and... The second injection molding process involves accommodating the outer layer material in the second mold and injecting the virgin material into the inner side of the outer layer material to form the inner layer material.

7. The manufacturing method for preforms according to claim 3, further comprising: The cooling process occurs after the second injection molding process, cooling the preform.

8. The manufacturing method for producing preforms according to claim 7, wherein During the cooling process, The preform is housed in the cavity mold. This allows the air-introducing component to come into airtight contact with the preform, and The preform is cooled by introducing air into the preform through an air inlet of the air inlet component and discharging the air out of the preform through an outlet of the air inlet component.

9. The manufacturing method for producing preforms according to claim 7, in, During the cooling process, the preform is cooled by clamping it between the cavity mold and the core mold.

10. The manufacturing method for manufacturing preforms according to claim 3, further comprising: The first cooling process cools the inner layer material or the outer layer material after the first injection molding process; as well as The second cooling process cools the preform after the second injection molding process.

11. A resin-made container characterized by comprising: include: Opening; Main body; as well as bottom, The resin container has a two-layer structure, wherein the main body and the bottom comprise an inner layer made of virgin material and an outer layer made of recycled material. The substrate of the virgin material and the substrate of the recycled material are both polyethylene terephthalate resin. Wherein, the ratio of the thickness of the outer layer to the thickness of the inner layer in the main body is 1.5 or more and 3.0 or less, and The haze of the main body is less than 1.8%.

12. A manufacturing method for manufacturing a resin-made container, characterized by, The manufacturing method includes: The injection molding process of the injection preform, the preform including an opening, a main body and a bottom, the preform having a two-layer structure, wherein the main body and the bottom include an inner layer made of virgin material and an outer layer made of recycled material; The temperature regulation process involves adjusting the temperature of the preform; and In the blow molding process, the preform is blow molded to form a resin container. The injection molding process includes: In the first injection molding process, the virgin material or the recycled material is injected into a first mold to injection mold an inner layer material or an outer layer material; and In the second injection molding process, the inner layer material or the outer layer material formed in the first injection molding process is housed in a second mold, and the recycled material is injected onto the outside of the inner layer material to injection mold the outer layer material, or the virgin material is injected onto the inside of the outer layer material to injection mold the inner layer material. The substrate of the virgin material and the substrate of the recycled material are both polyethylene terephthalate resin. In the injection molding process, the inner layer material and the outer layer material are molded such that the ratio of the thickness of the outer layer to the thickness of the inner layer in the main body is 1.5 or more and 3.0 or less. The haze of the main body of the container is less than 1.8%.

13. The method for manufacturing a resin container according to claim 12, wherein, The first injection molding process is a process of injecting the virgin material into the first mold to mold the inner layer material. The second injection molding process involves accommodating the inner layer material in the second mold and injecting the recycled material onto the outside of the inner layer material to form the outer layer material.

14. The method for manufacturing a resin container according to claim 13, wherein, The length of the gate in the first mold for injecting the virgin material is less than the thickness of the outer layer in the bottom of the preform.

15. The method for manufacturing a resin container according to claim 12, in, The first injection molding process is a process of injecting the recycled material into the first mold to mold the outer layer material, and... The second injection molding process involves accommodating the outer layer material in the second mold and injecting the virgin material into the inner side of the outer layer material to form the inner layer material.

16. The method for manufacturing a resin container according to claim 12, wherein The preform formed during the injection molding process is cooled during the temperature regulation process.

17. The method for manufacturing a resin container according to claim 16, in, During the temperature regulation process, The preform is housed in the cavity mold. This allows the air-introducing component to come into airtight contact with the preform, and The preform is cooled by introducing air into the preform through an air inlet of the air inlet component and discharging the air out of the preform through an outlet of the air inlet component.

18. The method for manufacturing a resin container according to claim 16, wherein, During the temperature regulation process, the preform is cooled by clamping it between the cavity mold and the core mold.

19. The method for manufacturing a resin container according to claim 12, wherein, The temperature regulation process includes a first temperature regulation process and a second temperature regulation process. The first temperature adjustment process is a process of cooling the inner layer material or the outer layer material after the first injection molding process; and The second temperature regulation process is the process of cooling the preform after the second injection molding process.

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