Extrusion blow container

Abstract

To provide an extrusion blow container that has a sufficient metallic feeling only by performing extruded blow molding.SOLUTION: An extrusion blow container 1 has a container body 10 made of synthetic resin in which a mouth part, a body part, and a bottom part are continuously provided in this order from top to bottom, and the container body includes a first layer 21 formed of a first synthetic resin 31 containing a metal powder 35, and a second layer 22 formed of a second synthetic resin 32 containing a colorant. A wall thickness of the first layer is 100 μm or less, and the first layer is arranged on the outer surface side of the container body with respect to the second layer and has an optical transparency.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to an extrusion blow container.

Background Art

[0002] In recent years, in order to achieve product differentiation and the like, extrusion blow containers with high designability having various shapes or appearances have begun to appear on the market. In such extrusion blow containers that emphasize designability, for example, when used for cosmetics, there is a need to further provide a unique appearance by imparting a metallic feeling (metallic luster feeling). As a method for imparting a metallic feeling, for example, a method using painting with a metallic pigment or a method using vapor deposition of a vapor deposition film mainly composed of a metal (see, for example, Patent Document 1 below) is known.

Prior Art Documents

Patent Documents

[0003]

Patent Document - 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, when imparting a metallic feeling by painting, vapor deposition, etc., processes such as painting and vapor deposition are required, which is laborious and likely to increase costs. Therefore, it has been difficult to meet the requirement of cost reduction for containers.

[0005] The present invention has been made in view of such circumstances, and an object thereof is to provide an extrusion blow container that can have a sufficient metallic feeling only by performing extrusion blow molding.

Means for Solving the Problems

[0006] The extrusion blow container according to the present invention is an extrusion blow container having a synthetic resin container body in which a mouth, a body, and a bottom are arranged in that order from top to bottom, wherein the container body comprises a first layer formed of a first synthetic resin containing metal powder and a second layer formed of a second synthetic resin containing a coloring agent, the thickness of the first layer being 100 μm or less, the first layer being disposed on the outer surface side of the container body than the second layer and having light transmittance Furthermore, the first layer is formed of a first synthetic resin having a lower haze value, which indicates the degree of cloudiness, than the second synthetic resin forming the second layer. .

[0007] In the extrusion blow container according to the present invention, the first layer containing metal powder is disposed on the outer surface of the container body, closer to the second layer than the second layer, and is light-transmitting. Therefore, the second layer, which is colored with a coloring agent, can be seen from the outside of the container body through the first layer containing metal powder. As a result, a metallic feel can be achieved through the effect of metallic luster utilizing the reflected light from the metal powder. This allows the colored second layer to be seen while experiencing a metallic feel, thus providing a metallic, glossy appearance. Since the first layer, which primarily exhibits a metallic appearance, is formed from a first synthetic resin containing metal powder, a sufficient metallic appearance can be achieved at the time the container body, comprising the first and second layers, is formed by extrusion blow molding, which blow-moldes a laminated parison, as described above. Therefore, unlike methods that achieve a metallic appearance through painting or vapor deposition, this method is less labor-intensive and lower in cost. As a result, it can meet the need for lower costs in containers and can be used as an extrusion-blown container suitable for various applications, such as cosmetic containers.

[0008] Since the first layer containing metal powder is positioned on the outer surface of the container body, rather than the colored second layer, the effect of metallic luster utilizing reflected light from the metal powder can be reliably achieved without increasing the thickness of the first layer or including a large amount of metal powder in the first layer. Since the wall thickness of the first layer is 100 μm or less, it is possible to suppress the content of metal powder in the first layer, making it possible to easily form an extruded blow container with sufficient metallic appearance without hindering moldability. Furthermore, it becomes easier to keep the wall thickness of such an extruded blow container thin, making it possible to easily obtain a squeeze container in which the body is compressed and deformed radially inward when the contents are discharged.

[0009] The thickness of the second layer may be 300 μm or more.

[0010] In this case, since the thickness of the second layer is 300 μm or more, the colored second layer can be clearly seen from the outside of the container body through the first layer.

[0011] The body portion may be formed to be elastically deformable, and may be a squeeze container in which the body portion is compressed and deformed radially inward when the contents are discharged.

[0012] In this case, a squeeze container with sufficient metallic properties can be obtained.

[0013] The container body may include a third layer that is disposed on the outer surface side of the container body than the first layer and is light-transmitting.

[0014] In this case, the container body is positioned on the outer side of the container body than the first layer, and a third layer with light transmittance is provided. This prevents the metal powder from being exposed on the outer surface of the container body, and also expands the range of designs for extruded blow containers by, for example, adjusting the haze value of the third layer.

[0015] The third layer may be formed from a third synthetic resin having a lower concentration of colorant than the second layer.

[0016] In this case, since the third layer is formed of a third synthetic resin having a lower concentration of the colorant than the second layer, the colored second layer can be surely visually recognized from the outside of the container body through the third layer and the first layer.

[0017] The thickness of the first layer may be thinner than the thickness of the second layer.

[0018] In this case, since the thickness of the first layer is thinner than the thickness of the second layer, the content of the metal powder in the first layer can be surely suppressed, and the thickness of the extrusion blow container having a sufficient metallic feeling can be easily suppressed to be thin.

Advantages of the Invention

[0019] ​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​ Examples of contents include cosmetics, food products, detergents, and pharmaceuticals. For example, cosmetics include lotions, serums, liquid soaps, and skin creams, while food products include beverages and condiments. However, the contents are not limited to specific items.

[0023] The mouth portion 11, shoulder portion 12, body portion 13, and bottom portion 14 are connected in this order, with their respective central axes positioned on a common axis. Hereinafter, this common axis will be referred to as the container axis O, and the mouth portion 11 side will be referred to as the upper direction and the bottom portion 14 side as the lower direction along the direction of the container axis O. Furthermore, when viewed from the direction of the container axis O, the direction intersecting the container axis O will be referred to as the radial direction, and the direction revolving around the container axis O will be referred to as the circumferential direction.

[0024] A male threaded portion 11a, onto which a cap (not shown) is screwed, is formed along the entire length of the circumferential surface of the opening 11. However, the method of attaching the cap is not limited to screwing; for example, it may be attached to the opening 11 by undercut fitting. In this case, a fitting projection for undercut fitting the cap should be formed on the outer surface of the opening 11 instead of the male thread portion 11a. When attaching the cap to the opening 11 by undercut fitting, the cap may be a hinged cap, for example. A dispenser having a cap may also be attached to the opening 11.

[0025] The shoulder portion 12 is connected to the lower end of the mouth portion 11 and widens in diameter radially outward as it extends downward from the lower end of the mouth portion 11. The body portion 13 is connected to the lower end of the shoulder portion 12 and extends straight downward from the lower end of the shoulder portion 12. As a result, the body portion 13 is formed in a cylindrical shape with the same diameter along its entire length in the direction of the container axis O. The bottom portion 14 is connected to the lower end of the body portion 13 and closes the lower end opening of the body portion 13.

[0026] However, the shape of the container body 10 is not limited and may be changed as appropriate depending on, for example, the capacity of the extruded blow container 1 or the type of contents. For example, the container body may be a rectangular bottle in which the body portion 13 has a rectangular shape when viewed in cross-section. The container body may also have a body portion 13 that widens in diameter from top to bottom. The container body may also be one in which there is no shoulder portion 12, and the upper end of the body portion 13 is reduced in diameter, with the upper end of the reduced-diameter body portion 13 connected to the lower end of the mouth portion 11.

[0027] The body portion 13 is formed to be elastically deformable, and the container body 10 is a squeeze container that compresses and deforms the body portion 13 radially inward when dispensing the contents. The wall thickness of the body portion 13 is 800 μm or less, preferably 600 μm or less. If the wall thickness of the body portion 13 is 350 μm or more, preferably 450 μm or more, the body portion 13 can be given resilience. The container body 10 is not limited to a squeeze container; it may be appropriately modified to, for example, a configuration having a body 13 that is substantially unable to be elastically deformed.

[0028] The container body 10 has a laminated structure in which multiple layers are stacked in the thickness direction of the container body 10. As shown in Figure 2, the container body 10 comprises a third layer 23, a first layer 21, a second layer 22, and a fourth layer 24, which are stacked in this order from the outer surface to the inner surface of the container body 10.

[0029] The first layer 21 is positioned on the outer surface side of the container body 10, closer to the surface of the second layer 22, and is a light-transmitting synthetic resin layer. The first layer 21 is formed of a first synthetic resin 31 that has a lower haze value (indicating the degree of cloudiness) than the second synthetic resin 32 that forms the second layer 22, the third synthetic resin 33 that forms the third layer 23, and the fourth synthetic resin 34 that forms the fourth layer 24. The first synthetic resin 31 is a resin primarily composed of block polypropylene, which generally has superior impact resistance compared to random polypropylene. However, the first synthetic resin 31 only needs to contain the largest amount of block polypropylene; it may also contain other synthetic resins or additives. The first synthetic resin 31 is a block polypropylene material with a relatively low degree of haze (for example, product name: CS356M, Haze: 11% (wall thickness 1 mm), manufactured by Sun Allomer). However, the material of the first synthetic resin 31 is just an example and may be changed as appropriate. The thickness of the first layer 21 is 100 μm or less. The thickness of the first layer 21 is less than 50% of the thickness of the container body 10. The thickness of the first layer 21 is thinner than the thickness of the second layer 22. However, the thickness of the first layer 21 is just an example and may be changed as appropriate.

[0030] The first synthetic resin 31 contains multiple metal powders 35. Examples of the metal powder 35 include aluminum powder, which is formed from extremely thin flakes or powder. However, it is not limited to this, and metals other than aluminum may be used. The particle size of the metal powder 35 is smaller than the thickness of the first layer 21, for example, 3 μm or more and less than 100 μm (for example, 20 μm). The metal powder 35 is included in the first synthetic resin 31 at a concentration of, for example, 5% by weight relative to the first synthetic resin 31. Note that the particle size and content of the metal powder 35 are examples and may be changed as appropriate. The first layer 21 is formed by extrusion blow molding of a first synthetic resin 31 to which metal powder 35 has been added. As a result, the metal powder 35 is evenly distributed throughout the entire first layer 21.

[0031] As described above, the first layer 21 contains metal powder 35 but is also light-transmitting, so that the colored second layer 22 can be seen from the outside of the container body 10 through the first layer 21. The light transmittance required for the first layer 21 is not particularly limited, as long as it can transmit visible light, but it is preferable that the haze value is 30% or less. The haze value can be measured using a colorimeter (SZ-Σ80-OS manufactured by Nippon Denshoku Industries).

[0032] The second layer 22 is formed of a second synthetic resin 32 containing a coloring agent. The second synthetic resin 32 does not contain metal powder 35. The thickness of the second layer 22 is 300 μm or more. The thickness of the second layer 22 is 50% to 90% of the thickness of the container body 10. The thickness of the second layer 22 is the thickest among the thicknesses of all the layers constituting the container body 10. However, the thickness of the second layer 22 is just an example and may be changed as appropriate. For example, the thickness of the second layer 22 may be less than or equal to the thickness of the first layer 21.

[0033] The second synthetic resin 32 is a resin mainly composed of block polypropylene (for example, product name: B511QA, Haze: 30% (wall thickness 1 mm), made by Prime Polymer). However, the second synthetic resin 32 only needs to contain the most block polypropylene, and may contain other synthetic resins or additives. The second layer 22 may be opaque and have light-shielding properties. The second synthetic resin 32 shares the same main resin component as the first synthetic resin 31 that forms the first layer 21. The second layer 22 is layered on top of the first layer 21 in close contact. Note that the material of the second synthetic resin 32 is just an example and may be changed as appropriate. For example, the main components of the resins of the second synthetic resin 32 and the first synthetic resin 31 may be different from each other, and an adhesive layer may be placed between the second layer 22 and the first layer 21.

[0034] The coloring agent is not particularly limited, but one example is a masterbatch that is kneaded into the second synthetic resin 32 to give it color. The masterbatch is a pellet-shaped colorant containing a high concentration of pigment, which is mixed into the second synthetic resin 32, for example, together with natural pellets, and the intensity of the color can be adjusted according to the ratio of the two. In this embodiment, pearl pigment is added to the masterbatch at a concentration of approximately 10% by weight. The particle size of the pearl pigment is 5 μm to 60 μm. The coloring agent is included in the second synthetic resin 32 at a concentration of less than 15% by weight (for example, 10% by weight) relative to the second synthetic resin 32. However, the amount of coloring agent is just an example and may be changed as appropriate.

[0035] Furthermore, the coloring agent is not limited to a masterbatch; for example, pre-colored pellets with adjusted color intensity may be used, or liquid or gel-type paste colors may be used. The color of the second layer 22 colored by the coloring agent is not limited to a specific color and may be changed as appropriate depending on the intended use of the extruded blow container 1, the type of contents, etc.

[0036] The third layer 23 is a synthetic resin layer that forms the outer surface of the container body 10. The third layer 23 covers the first layer 21 from the outer surface side of the container body 10. The third layer 23 is made of a third synthetic resin 33 that has a lower concentration of colorant than the second layer 22. The third layer 23 is made of a third synthetic resin 33 that does not contain colorant or metal powder 35.

[0037] The third layer 23, like the first layer 21, is light-transmitting, allowing the second layer 22 to be seen from the outside of the container body 10 through the third layer 23 and the first layer 21. The haze value of the third layer 23 is between 1.0% and 10.0%. The haze value of the third layer 23 is the smallest among the haze values ​​of each layer constituting the container body 10. The haze value of the third layer 23 may be set to be greater than or equal to the haze values ​​of the first layer 21, the second layer 22, and the fourth layer 24.

[0038] The thickness of the third layer 23 is thinner than the thicknesses of the first layer 21 and the second layer 22, and is the same as the thickness of the fourth layer 24. The thickness of the third layer 23 is the thinnest of all the layers that make up the container body 10. Note that the thickness of the third layer 23 is just an example and may be changed as appropriate. For example, the thickness of the third layer 23 may be greater than or equal to the thickness of the first layer 21 and the second layer 22.

[0039] The third synthetic resin 33 is a resin whose main material is block polypropylene. However, the third synthetic resin 33 only needs to contain block polypropylene in the largest amount, and may contain other synthetic resins or additives. The third synthetic resin 33 shares the same main resin component as the first synthetic resin 31 that forms the first layer 21. The third layer 23 is overlapping the first layer 21 in a tightly adhering state.

[0040] The third synthetic resin 33 is a material with a relatively high degree of haze among block polypropylenes (for example, product name: BC6D, Haze: 90% (thickness 1 mm), manufactured by Nippon Polypropylene). Although the third layer 23 is formed from the third synthetic resin 33 with a relatively high degree of haze, its thinness results in a relatively small haze value. The material of the third synthetic resin 33 is merely an example and may be changed as appropriate. For example, the main components of the resins of the third synthetic resin 33 and the first synthetic resin 31 may be different from each other, and an adhesive layer may be placed between the third layer 23 and the first layer 21. In addition, a rough surface portion may be formed on at least a part of the outer surface of the third layer 23 that is rougher than the surface roughness of the inner surface (adhesion surface with the first layer 21) of the third layer 23. Instead of the third layer 23, the outer surface of the first layer 21 may be painted or a film may be applied, for example.

[0041] The fourth layer 24 is a layer that forms the inner surface of the container body 10 and is disposed on the inner surface side of the container body 10 than the second layer 22. The fourth layer 24 is made of a fourth synthetic resin 34. The fourth synthetic resin 34 does not contain a coloring agent or metal powder 35. In this embodiment, the fourth synthetic resin 34 is the same as the second synthetic resin 32 of the second layer 22. The fourth layer 24 is a synthetic resin layer that is in close contact with the second layer 22. Note that the material of the fourth synthetic resin 34 is an example and may be changed as appropriate. For example, the main components of the resins of the fourth synthetic resin 34 and the second synthetic resin 32 may be different from each other, and an adhesive layer may be disposed between the fourth layer 24 and the second layer 22. The thickness of the fourth layer 24 is the same as the thickness of the third layer 23. Note that the thickness of the fourth layer 24 is just an example and may be changed as appropriate.

[0042] The following describes a method for forming an extruded blow-molded container 1 by extruded blow molding.

[0043] First, a cylindrical laminated parison is formed by combining the third layer 23, the first layer 21, the second layer 22, and the fourth layer 24 in this order from the radial outside to the inside (parison formation process). Next, this laminated parison is sandwiched in a molding die and placed in the cavity (clamping process), and then pressurized air is supplied (blown) into the laminated parison to inflate it (blow process). As a result, the outer surface of the laminated parison is pressed against the inner surface of the cavity of the molding die, and the laminated parison is formed in a shape corresponding to the inner surface of the cavity, resulting in the extrusion blow container 1 shown in Figures 1 and 2.

[0044] Next, an example of the extrusion blow container 1 will be described. However, the present invention is not limited to the following examples.

[0045] As the first synthetic resin 31 of the first layer 21, a material with a relatively low degree of cloudiness among block polypropylenes was adopted (for example, product name: CS356M, Haze: 11% (wall thickness 1 mm), manufactured by Sun Allomer). Metal powder 35 was added to the first synthetic resin 31 at a concentration of 5% by weight relative to the first synthetic resin 31. As the metal powder 35, aluminum powder with a size of 20 μm × 5 μm × 5 μm was adopted. The wall thickness of the first layer 21 was set to approximately 47 μm (approximately 8% of the wall thickness of the container body 10). Block polypropylene (product name: B511QA, Haze: 30% (wall thickness 1 mm), manufactured by Prime Polymer) was used as the second synthetic resin 32 for the second layer 22. A masterbatch containing pearl pigment with a particle size of 5 μm to 60 μm at a concentration of 10% by weight was added to the second synthetic resin 32 at a concentration of 10% by weight relative to the second synthetic resin 32. The wall thickness of the second layer 22 was set to approximately 490 μm (approximately 85% of the wall thickness of the container body 10). For the third layer 23, the third synthetic resin 33 was selected from among block polypropylenes, specifically a material with a relatively high degree of cloudiness (product name: BC6D, Haze: 90% (wall thickness 1 mm), manufactured by Nippon Polypropylene). The wall thickness of the third layer 23 was set to approximately 20 μm (approximately 3% of the wall thickness of the container body 10). For the fourth synthetic resin 34 of the fourth layer 24, block polypropylene (product name: B511QA, Haze: 30% (thickness 1 mm), manufactured by Prime Polymer), the same material as the second synthetic resin 32, was used. The thickness of the fourth layer 24 was set to approximately 20 μm.

[0046] Laminated parisons were formed by extrusion molding using the materials described above. At this time, the thickness of the third layer 23 was set to approximately 50 μm, the thickness of the first layer 21 to approximately 130 μm, the thickness of the second layer 22 to approximately 1300 μm, and the thickness of the fourth layer 24 to approximately 50 μm. As a result, by simply performing extrusion blow molding, we were able to actually create an extrusion-blown container 1 with sufficient metallic properties, as shown in Figure 3.

[0047] As described above, in the extrusion blow container 1 of this embodiment, the first layer 21 containing the metal powder 35 is arranged on the outer surface side of the container body 10 than the second layer 22 and is light-transmitting. Therefore, the second layer 22, which is colored with a coloring agent, can be seen from the outside of the container body 10 through the first layer 21 containing the metal powder 35. As a result, a metallic feel can be achieved by utilizing the effect of metallic luster from the reflected light of the metal powder 35. This allows the colored second layer 22 to be seen while feeling the metallic effect, thus providing a metallic, glossy appearance.

[0048] Since the first layer 21, which primarily exhibits a metallic appearance, is formed from a first synthetic resin 31 containing metal powder 35, a sufficient metallic appearance can be achieved at the time the container body 10, comprising the first layer 21 and the second layer 22, is formed by extrusion blow molding, which blow-moldes a laminated parison, as described above. Therefore, unlike cases where a metallic appearance is achieved by painting or vapor deposition, it requires less effort and can be made more cost-effective. As a result, it can meet the need for cost reduction in containers and can be used suitably for various applications, such as cosmetic containers.

[0049] Since the first layer 21 containing the metal powder 35 is positioned on the outer surface side of the container body 10, even without increasing the thickness of the first layer 21 or including a large amount of the metal powder 35 in the first layer 21, the effect of metallic luster utilizing the reflected light from the metal powder 35 can be reliably achieved. Since the wall thickness of the first layer 21 is 100 μm or less, it is possible to suppress the content of metal powder 35 in the first layer 21, making it possible to easily form an extruded blow container 1 with sufficient metallic feel without hindering moldability, and it is also possible to keep the wall thickness of such an extruded blow container 1 thin, making it possible to easily obtain a squeeze container in which the body portion 13 is compressed and deformed radially inward when the contents are discharged.

[0050] Since the thickness of the second layer 22 is 300 μm or more, the colored second layer 22 can be clearly seen through the first layer 21 from the outside of the container body 10. Since the body portion 13 is formed to be elastically deformable, it is possible to compress and deform the body portion 13 radially inward when dispensing the contents, and a squeeze container with sufficient metallic appearance can be obtained.

[0051] Since the container body 10 is positioned on the outer surface side of the container body 10 than the first layer 21 and is equipped with a light-transmitting third layer 23, it is possible to prevent the metal powder 35 from being exposed on the outer surface of the container body 10, and the range of designs for the extruded blow container 1 can be broadened by, for example, adjusting the haze value of the third layer 23. Since the third layer 23 is formed of a third synthetic resin 33 with a lower concentration of coloring agent than the second layer 22, the colored second layer 22 can be clearly seen from the outside of the container body 10 through the third layer 23 and the first layer 21.

[0052] Since the thickness of the first layer 21 is thinner than the thickness of the second layer 22, the amount of metal powder 35 in the first layer 21 can be reliably suppressed, and the thickness of the extruded blow container 1, which has a sufficient metallic appearance, can be easily kept thin.

[0053] The present invention is not limited to the embodiments described above, and can be modified as appropriate without departing from its spirit.

[0054] For example, other layers may be arranged on the inner surface side of the container body 10, beyond the fourth layer 24. As the other layer, for example, a configuration may be adopted in which a peelable layer is laminated on the inner surface of the fourth layer 24 and which can be deformed to reduce in volume as the contents decrease. In this configuration, the container body 10 can be used as a laminated peelable container (delami bottle). The container body 10 does not necessarily have to have the third layer 23 and the fourth layer 24. The first synthetic resin 31, the second synthetic resin 32, the third synthetic resin 33, and the fourth synthetic resin 34 are not limited to block polypropylene; for example, random polypropylene and high-density polyethylene may also be used.

[0055] The fourth synthetic resin 34 may contain a light-shielding material. An example of a light-shielding material is a milky white masterbatch (for example, product name: PPM-2KF868S-CRM-B-FD, manufactured by Toyo Color). However, it is not limited to this case, and a masterbatch of gray or black, for example, may be used. The light-shielding material may be included in the fourth synthetic resin 34 at a concentration of, for example, 8% by weight. Note that the amount of light-shielding material is just an example and may be changed as appropriate. The visible light transmittance in the fourth layer 24 may be 10% or less, preferably 3% or less, and more preferably 0%. The light transmittance can be measured in accordance with JIS K7375 using an ultraviolet-visible-near-infrared spectrophotometer (Shimadzu UV-3150).

[0056] Furthermore, without departing from the spirit of the present invention, the components in the above-described embodiments may be replaced with well-known components as appropriate, and the above-described embodiments and modifications may be combined as appropriate. [Explanation of symbols]

[0057] 1…Extrusion blow container 10…Container body 11...Mouth 13... Torso 14...Bottom 21…1st layer 22…Second layer 23...Third layer 31…First synthetic resin 32…Second synthetic resin 33…Third synthetic resin 35...Metal powder

Claims

1. An extruded blow container having a synthetic resin container body in which the mouth, body, and bottom are arranged in this order from top to bottom, The container body is A first layer formed from a first synthetic resin containing metal powder, It comprises a second layer formed of a second synthetic resin containing a coloring agent, The thickness of the first layer is set to 100 μm or less. The first layer is disposed on the outer surface side of the container body than the second layer and has light transmittance. An extrusion blow container, wherein the first layer is formed of a first synthetic resin having a lower haze value (indicating a lower degree of cloudiness) than the second synthetic resin forming the second layer.

2. The extrusion blow container according to claim 1, wherein the thickness of the second layer is 300 μm or more.

3. The aforementioned body portion is formed to be elastically deformable, The extrusion blow container according to claim 1 or 2, which is a squeeze container in which the body is compressed and deformed radially inward when the contents are discharged.

4. The extrusion blow container according to any one of claims 1 to 3, wherein the container body is disposed on the outer surface side of the container body than the first layer and comprises a third layer that is light-transmitting.

5. The extrusion blow container according to claim 4, wherein the third layer is formed of a third synthetic resin having a lower colorant concentration than the second layer.

6. The extrusion blow container according to any one of claims 1 to 5, wherein the thickness of the first layer is thinner than the thickness of the second layer.

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