cone

Abstract

This invention provides cones that are easy to pull out even when stacked and left undisturbed in direct sunlight, and that are also easy to mold and process. [Solution] A cone having a conical portion, wherein the conical portion contains polyethylene terephthalate and polyethylene naphthalate, and the mass ratio of polyethylene terephthalate to polyethylene naphthalate is 85:15 to 15:85.

Description

Technical Field

[0001] The present invention relates to cones. In particular, it relates to cones that represent lane regulation, demarcation during road construction, guidance of pedestrian flow, entry prohibition, etc.

Background Art

[0002] Hitherto, generally, cones have been used for the purpose of preventing vehicles and pedestrians from entering factory sites such as roads and buildings, or guiding vehicles and pedestrians. Regarding such cones, for example, in Patent Document 1, a transparent resin molded article selected from the group consisting of a dustbin, a pylone, a vase, a stool, an umbrella of a lighting fixture, an umbrella stand, and a powder storage container obtained by melt molding using two or more kinds of polyester resins, when the acid component / glycol component of the entire polyester resin composition is 100 / 100 mol%, one or more copolymer components selected from the group consisting of isophthalic acid, 2,6-naphthalenedicarboxylic acid, diethylene glycol, neopentyl glycol, 1,4-cyclohexanedimethanol, 1,2-propanediol, 1,3-propanediol, and 2-methyl-1,3-propanediol are 1 to 30 mol%, and a transparent resin molded article in which the mass ratio of germanium atoms / antimony atoms contained as a catalyst in the entire composition is 10 / 90 to 99 / 1 is disclosed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Through our research, we have found that the dimensions of the conical portion of the cone may not be stable during molding depending on the resin composition. Furthermore, we have found that when multiple conventional cones are stacked and left in direct sunlight, it becomes difficult to pull them apart. This invention was made in view of the above circumstances, and its purpose is to provide a cone that is easy to pull apart even when multiple cones are stacked and left in direct sunlight, and that is also easy to mold. [Means for solving the problem]

[0005] The cone according to an embodiment of the present invention is as follows [1]. [1] A cone having a conical portion, The aforementioned conical portion contains polyethylene terephthalate and polyethylene naphthalate. A cone having a mass ratio of polyethylene terephthalate to polyethylene naphthalate of 85:15 to 15:85.

[0006] By including polyethylene terephthalate and polyethylene naphthalate in the above-mentioned mass ratio in the cone's conical portion, multiple cones can be stacked and left undisturbed in direct sunlight, making them easy to pull out, and the cones have excellent moldability. The cone according to the embodiment is preferably one of the following [2] to [5]. [2] The cone according to [1], wherein the conical portion has a transparent portion and the haze value at a thickness of 3 mm of the transparent portion is 35% or less. [3] The cone according to [1] or [2], wherein the lower part of the side surface of the conical portion has a first through hole. [4] The cone according to any one of [1] to [3], wherein the top of the conical portion has a second through hole. [5] It further has a base portion, and the conical portion is positioned on the base portion, The conical portion, the base portion, or both thereof have a first fitting portion, The conical portion, the base portion, or both thereof, have a second fitting portion having a shape that can be fitted with the first fitting portion. The cone according to any one of [1] to [4], wherein the first fitting portion and the second fitting portion have overlapping portions in the vertical direction. [Effects of the Invention]

[0007] With the above configuration, it is possible to provide cones that are easy to pull out even when stacked and left undisturbed in direct sunlight, and that are also easy to mold. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a side view of a cone according to an embodiment. [Figure 2] Figure 2 is a side view of multiple cones stacked on top of each other, as shown in Figure 1. [Figure 3] Figure 3 is a bottom view of the cone shown in Figure 1, viewed from the bottom side. [Figure 4] Figure 4 is a side view of the cone in Figure 1 with a cone weight placed on top. [Figure 5] Figure 5 is a top view of the cone weight shown in Figure 4, viewed from above. [Modes for carrying out the invention]

[0009] The cone according to the embodiment is a cone having a conical portion, the conical portion containing polyethylene terephthalate and polyethylene naphthalate, and the mass ratio of polyethylene terephthalate to polyethylene naphthalate is 85:15 to 15:85. By containing polyethylene terephthalate and polyethylene naphthalate in the above mass ratio in the conical portion of the cone, multiple cones can be stacked and left standing in direct sunlight, making them easy to pull out, and the cone has excellent moldability.

[0010] The following describes the cone according to the embodiment in detail with reference to Figures 1 to 3. Figure 1 is a side view of the cone according to the embodiment. Figure 2 is a side view of multiple cones stacked on top of each other. Figure 3 is a bottom view of the cone in Figure 1 as seen from the bottom. Figure 4 is a side view of the cone in Figure 1 with a cone weight placed on top. Figure 5 is a top view of the cone weight in Figure 4 as seen from the top.

[0011] As shown in Figure 1, the cone 91 according to the embodiment has a conical portion 10. The inside of the conical portion 10 is hollow, and as shown in Figure 2, multiple cones 91 can be stacked. The conical portion 10 contains polyethylene terephthalate and polyethylene naphthalate, and the mass ratio of polyethylene terephthalate to polyethylene naphthalate is 85:15 to 15:85. Preferably, the mass ratio is 80:20 to 20:80. This makes it easier to pull out the cones 91 from the top even when multiple cones 91 are stacked and left in direct sunlight, and also improves the moldability of the cones 91. More specifically, it is thought that in general, the conical portion of a cone is prone to uneven thickness during molding, and when multiple such cones are stacked and left in direct sunlight, the unevenness in the thickness of the conical portion of each cone increases due to the rising temperature and the weight of the stacked cones, making it easier for the cones to come into contact with each other, and as a result it becomes difficult to pull out the cones from the top. On the other hand, by setting the mass ratio of polyethylene terephthalate to polyethylene naphthalate within the above range, it is possible to suppress the increase in thickness unevenness of the conical portion caused by the temperature rise due to direct sunlight and the weight of the cone, making it easier to pull the cone out from above. Furthermore, the mass ratio is more preferably 30:70 to 70:30, and even more preferably 40:60 to 60:40. This also makes it easier to improve transparency. If the mass ratio is preferably in the range of 50:50 to 20:80, the load deflection temperature, which will be described later, is more likely to improve.

[0012] In 100% by mass of the resin composition constituting the conical portion 10, it is preferable that the conical portion 10 contains polyethylene terephthalate and polyethylene naphthalate in a total content of 90% by mass or more, more preferably 95% by mass or more, and still more preferably 98% by mass or more. The content may be 100% by mass or less, 99.5% by mass or less, or 99.0% by mass or less. Among these, in particular, polyethylene terephthalate preferably contains recycled PET. For example, by using PET bottle flakes obtained by crushing used PET bottles as a raw material for polyethylene terephthalate, it is possible to contribute to reducing plastic waste and effectively using resources.

[0013] The glass transition temperature of polyethylene terephthalate is preferably 71 to 73°C, more preferably 72°C. The glass transition temperature of polyethylene naphthalate is preferably 112 to 114°C, more preferably 113°C. The glass transition temperature of the resin composition constituting the conical portion 10 is preferably 78 to 110°C. Thereby, while improving the moldability of the conical portion 10, the load deflection temperature described later can be improved.

[0014] The resin composition constituting the conical portion 10 may contain additives in addition to polyethylene terephthalate and polyethylene naphthalate. The additives may include a colorant, a dispersant, a stabilizer, an antioxidant, an ultraviolet absorber, a lubricant, a mold release agent, a nucleating agent, an antistatic agent, or a mixture thereof. The colorant may include a dye, a pigment, or a mixture thereof. The dye and the pigment may each be organic, inorganic, or organometallic. Also, the dye and the pigment may be a fluorescent whitening agent. The colorant may be in the form of toner. Examples of the antioxidant include aromatic amine-based and phenol-based ones. Examples of the stabilizer include phosphorus-based ones such as phosphoric acid and phosphate esters, sulfur-based ones, and amine-based ones. Thereby, coloring and discoloration due to the change over time of the cone can be suppressed. These may be used alone or in combination of two or more.

[0015] The conical part 10 has a transparent part 13, and it is preferable that the haze value at a thickness of 3 mm of the transparent part 13 is 35% or less. Thereby, the transparency of the conical part 10 is improved. When the transparency of the conical part 10 is improved, it is difficult to place dangerous substances such as explosives inside the cone 91, so it can be suitably used for large-scale events or around social infrastructure. Also, due to the improvement in transparency, it becomes difficult to place items that lead to crimes such as cameras and eavesdropping devices inside the cone 91. Therefore, the haze value is more preferably 33% or less, even more preferably 30% or less, and even more preferably 28% or less. On the other hand, the haze value may be 1% or more, 5% or more, 10% or more, or 15% or more. The haze value can be measured by the method described in the examples below.

[0016] The transparency of the transparent part 13 of the conical part 10 tends to improve as the content of polyethylene terephthalate and the content of polyethylene naphthalate approach an equal amount, and the transparency can be controlled by adjusting these contents. In addition, the transparency can also be improved by controlling the heat treatment temperature and cooling conditions during molding to suppress the crystallization of the resin and make it amorphous.

[0017] The conical part 10 preferably contains the transparent part 13 at a ratio of 80% by mass or more, and more preferably 90% by mass or more. Thereby, the overall transparency of the conical part 10 can be improved. The ratio may be 100% by mass or less, 99% by mass or less, 98% by mass or less, or 95% by mass or less. A part of the conical part 10 may be printed with ink or a reflective tape may be fixed.

[0018] The transparency mentioned above also includes so-called colored transparency. For example, using a synthetic resin colorant (11-14-10441) manufactured by Hanwa Chemical Co., Ltd., which is a mixture of yellow dye, orange dye, and dispersant, makes it easy to color the conical part 10 as orange transparent. On the other hand, using a synthetic resin colorant (11-15-10441) manufactured by the same company, which is a combination of yellow dye, red dye, carbon black, and dispersant, makes it easy to color the conical part 10 as red transparent. To obtain the desired color, one can select from a single dye or a combination of multiple dyes and dispersants. Examples of dyes include pigment-type dyes, dispersion-type dyes, and reactive-type dyes.

[0019] The thickness of the side surface of the conical portion 10 is preferably 2.0 to 8.0 mm. This makes it easier to achieve both strength maintenance and improved transparency. The thickness is more preferably 3.0 to 6.0 mm, and even more preferably 3.5 to 4.5 mm.

[0020] The conical portion 10 preferably has a load deflection temperature of 65 to 90°C according to Method A of JIS K7191-2 (bending stress: 1.8 MPa). Furthermore, the conical portion 10 preferably has a load deflection temperature of 70 to 100°C according to Method B of JIS K7191-2 (bending stress: 0.45 MPa). This is thought to reduce deformation of the conical portion 10 due to external forces in high-temperature environments and improve moldability. These load deflection temperatures can be measured by the method described in the examples below.

[0021] As shown in Figure 1, it is preferable that the lower part 11U of the side surface 11 of the conical portion 10 has a first through-hole 1H. The lower part of the conical portion 10 is susceptible to the effects of sunlight reflected from the ground and is also prone to uneven thickness during molding. Therefore, by releasing the heated air from inside through the first through-hole 1H in the lower part of the conical portion 10 to reduce the temperature rise, it becomes easier to prevent deformation of the lower part 11U of the side surface 11 of the conical portion 10 under direct sunlight. On the other hand, although not shown, the upper part 11T of the side surface 11 of the conical portion 10 may also have a first through-hole 1H, or the lower part 11U and the upper part 11T may each have a first through-hole 1H.

[0022] As shown in Figure 1, it is preferable that the side surface 11 of the conical portion 10 has only one first through-hole 1H, but it may have multiple. When the side surface 11 of the conical portion 10 has only one first through-hole 1H, the first through-hole 1H can easily function as a marker for aligning the orientation when stacking multiple cones 91. For example, if multiple cones 91 are stacked without the orientation of the first through-hole 1H being aligned, the direction of expansion of each cone 91 will be different in a high-temperature environment. However, if multiple cones 91 are stacked so that the orientation of the first through-hole 1H is aligned, as shown in Figure 2, the multiple cones 91 will expand similarly in a high-temperature environment, making it easier to pull out the cones 91 when stacked with the orientation of the first through-hole 1H aligned. For this reason, it is preferable to use the first through-hole 1H on the side surface 11 of the conical portion 10 as a marker for aligning the orientation of the cones 91. In addition, markings for aligning the orientation of the cone 91 may be added to the conical portion 10 by printing with ink, branding, attaching a sticker, or coloring a part of it a different color. On the other hand, if the side surface 11 of the conical portion 10 has multiple first through holes 1H, the number of first through holes 1H on the side surface 11 of the conical portion 10 may be 2 to 6, or 2 to 4.

[0023] The first through-hole 1H in the side surface 11 of the conical portion 10 is preferably circular, elliptical, or linear. This makes it easier to maintain the strength of the area surrounding the first through-hole 1H of the conical portion 10. Furthermore, if the first through-hole 1H is elliptical and the major axis of the ellipse extends along the direction toward the apex 12 of the conical portion 10, the first through-holes 1H can easily communicate with each other when multiple cones 91 are stacked with their orientations aligned. Easier communication between the first through-holes 1H can reduce the temperature rise inside the multiple cones 91. On the other hand, if the first through-hole 1H is elliptical and the major axis of the ellipse extends along a direction perpendicular to the direction toward the apex 12 of the conical portion 10, the first through-holes 1H can easily communicate with each other even when multiple cones 91 are stacked without their orientations aligned. Similar effects can be obtained when the first through-hole 1H is linear, depending on the direction of extension. The linear shape is preferably straight, but it may be curved or bent in part or in whole. For example, the linear shape may be zigzag, wavy, spiral, etc.

[0024] The opening area of ​​the first through-hole 1H on the side surface 11 of the conical portion 10 is 3 to 15 cm². 2 This is preferable. This makes it easier to achieve both ventilation efficiency and maintaining strength around the opening. If the side surface 11 of the conical portion 10 has a plurality of first through holes 1H, the opening area is the opening area of ​​each through hole.

[0025] As shown in Figure 1, it is preferable that the apex 12 of the conical portion 10 has a second through-hole 2H. This facilitates the discharge of air from inside the cone 91. The second through-hole 2H is preferably circular or elliptical, and more preferably circular. This helps maintain the strength of the area surrounding the second through-hole 2H of the conical portion 10. The opening area of ​​the second through-hole 2H at the apex 12 of the conical portion 10 is 3 to 15 cm². 2 This is preferable. This makes it easier to achieve both ventilation efficiency and maintaining structural integrity around the opening.

[0026] As shown in Figure 1, it is preferable that the cone 91 further has a base portion 20. It is preferable that the conical portion 10 is placed on the base portion 20. The base portion 20 can support the conical portion 10. The conical portion 10h may be fixed to the base portion 20 by fitting, welding, bonding, etc., or it may be integrally molded with the base portion 20. It is preferable that the base portion 20 contains the same components as the resin composition that constitutes the conical portion 10, and more preferably that it is made of the same resin composition. This makes manufacturing easier. Note that the cone 91 only needs to have at least the conical portion 10 and does not need to have a base portion 20.

[0027] As shown in Figure 3, the shape of the outer edge of the base portion 20 in plan view is preferably a polygon, a rounded polygon, or a circle, more preferably a square, a rounded square, or a circle, and even more preferably a square or a rounded square. This increases the stability of the base portion 20 and makes it less likely to move due to external forces such as wind and rain, thereby improving the stability of the cone 91. It also makes it easier to store them neatly without taking up much space and to stack them easily.

[0028] As shown in Figures 1 and 3, the base portion 20 preferably has a plate-like portion 21 and a stepped portion 22 located above the plate-like portion 21. The shape of the outer edge of the plate-like portion 21 in plan view is preferably a polygon, a rounded polygon, or a circle, more preferably a square, a rounded square, or a circle, and even more preferably a square or a rounded square. As shown in Figure 3, the plate-like portion 21 preferably has a circular through-hole that penetrates in the vertical direction V. This makes it easier to stack multiple cones 91.

[0029] The stepped portion 22 is preferably ring-shaped. This allows the stepped portion 22 to easily come into contact with the cone weight 30 when the cone weight 30 is placed on the plate-shaped portion 21, as shown in Figure 4, thereby suppressing the movement of the cone weight 30. The cone weight 30 is a weight used to improve the stability of the cone 91. The cone weight 30 preferably contains synthetic rubber. Although not shown, the cone weight 30 may also have a cavity. The weight of the cone weight 30 can be increased by filling the cavity with water, sand, etc., and in this case, the cone weight 30 preferably contains a resin such as polyethylene or polyethylene terephthalate.

[0030] As shown in Figure 5, the cone weight 30 is preferably plate-shaped and has a circular through-hole 30H that penetrates in the vertical direction V. This allows the cone weight 30 to be positioned in contact with the ring-shaped stepped portion 22. Although not shown, if the cone weight 30 is fixed to the bottom surface of the plate-shaped portion 21, for example, the cone weight 30 having a through-hole 30H allows the cones 91 to be stacked while the cone weight 30 is fixed to the bottom surface of the cone 91.

[0031] Although not shown in the figures, the base portion 20 may have multiple stepped portions 22. In this case, the multiple stepped portions 22 overlap in the vertical direction V, and it is preferable that the diameter of the outer edge of the upper stepped portion 22 is smaller than the diameter of the outer edge of the lower upper stepped portion 22. The base portion 20 does not necessarily have to have stepped portions 22.

[0032] Although not shown, the base portion 20 may have a cavity. By filling the cavity of the base portion 20 with water, sand, etc., the weight of the base portion 20 can be increased, and as a result the stability of the cone 91 is improved. Specifically, it is preferable that the plate-shaped portion 21 has a cavity. Alternatively, the weight of the base portion 20 may be increased by increasing the thickness of the base portion 20.

[0033] The following describes a configuration that guides workers to align the orientation of the cones 91 and stack them. For example, it is preferable that the conical part 10, the base part 20, or both thereof have a first fitting part 1F, and the conical part 10, the base part 20, or both thereof have a second fitting part 2F that has a shape that can fit with the first fitting part 1F. Furthermore, it is preferable that the first fitting part 1F and the second fitting part 2F have an overlapping portion in the vertical direction V. In Figure 1, the base part 20 has a convex first fitting part 1F on the upper side and a concave second fitting part 2F on the lower side, and the first fitting part 1F and the second fitting part 2F have an overlapping portion in the vertical direction V. Furthermore, in Figure 2, two cones 91 are stacked, and they are stacked so that the first fitting part 1F of the lower cone 91 and the second fitting part 2F of the upper cone 91 fit together. For example, if a worker randomly stacks the cones 91 and the first fitting part 1F and the second fitting part 2F do not fit together, the upper cone 91 will be tilted. In that case, the worker will change the orientation of the upper cone 91 so that the first fitting part 1F and the second fitting part 2F fit together, so that the cones 91 are stacked with their orientations aligned. In this way, the first fitting part 1F and the second fitting part 2F can guide the worker to align the orientation of the cones 91.

[0034] Although not shown in the figures, the conical portion 10 may have a fitting portion. For example, the outer surface of the conical portion 10 may have a convex first fitting portion 1F, and the inner surface of the conical portion 10 may have a concave second fitting portion 2F.

[0035] The shape of the first fitting portion 1F is preferably convex or concave. The shape of the convex or concave portion in plan view is preferably a polygon, a rounded polygon, an ellipse, or a circle, more preferably a quadrilateral, a rounded quadrilateral, or a circle, and even more preferably a square or a rounded square. The convex or concave portion may be a shape that extends in a certain direction.

[0036] The shape of the second fitting portion 2F is preferably concave or convex. The concave or convex shape in plan view is preferably a polygon, a rounded polygon, an ellipse, or a circle, more preferably a quadrilateral, a rounded quadrilateral, or a circle, and even more preferably a square or a rounded square. The concave or convex shape may extend in a certain direction.

[0037] Preferably, the cone 91 has only one first fitting portion 1F and one second fitting portion 2F, but it may have multiple of each. When the cone 91 has only one first fitting portion 1F and one second fitting portion 2F, it becomes easier to guide the worker to align the orientation of the cones 91 and stack them.

[0038] In addition, the cone weight 30 may have a fitting portion. For example, as shown in Figures 4 and 5, the cone weight 30 may have a convex first fitting portion 1F on its upper surface, and the base portion 20 may have a concave second fitting portion 2F on its lower surface. Although not shown, if the cone weight 30 is fixed to the bottom surface of the plate-shaped portion 21 of the base portion 20, the base portion 20 may have a convex first fitting portion 1F on its upper surface, and the cone weight 30 may have a concave second fitting portion 2F on its lower surface.

[0039] The height of the cone 91 is preferably 30 to 100 cm, and more preferably 50 to 90 cm. The mass of the cone 91 is preferably 0.2 to 3 kg, and more preferably 0.7 to 2 kg.

[0040] The cone 91 can be manufactured by, for example, injection molding, extrusion molding, injection blow molding, direct blow molding, blow compression molding, stretch blow molding, calendering, thermoforming (vacuum / pressure molding), reaction injection molding, foam molding, compression molding, lamination molding, or other molding methods. Of these, blow molding is preferred because it can improve the molding cycle, and injection blow molding is more preferred. When manufacturing the cone 91, it is preferable to form the conical portion 10 and the base portion 20 integrally, but several parts may be formed and then assembled.

[0041] When melt-molding the cone 91, the heating temperature of the resin composition is preferably 200 to 350°C, and more preferably 250 to 300°C. This makes it less likely for the resin composition to degrade due to heat and makes it easier for the resin composition to melt and flow.

[0042] To prepare the resin composition, at least polyethylene terephthalate and polyethylene naphthalate should be mixed. This mixing can be done by measuring the weight of each resin to achieve the desired mixing ratio and mixing them in a blender, or by adding a predetermined amount during melting using a belt conveyor or screw feeder. Of these methods, blender mixing is the simplest in terms of equipment.

[0043] The following describes an example of blow molding (hollow molding). First, a preform is manufactured using a resin composition as the material, for example, by injection molding or extrusion molding. Next, the cone 91 can be manufactured by heating the preform and then performing stretch blow molding. For stretch blow molding, a biaxial stretch blow molding method such as the hot parison method or the cold parison method is preferred. In this case, the molding temperature, specifically the temperature of each part of the cylinder and the nozzle of the molding machine, is preferably 260 to 290°C. The mold temperature is preferably 10 to 30°C. The heating temperature of the preform obtained by injection molding before blow stretching is preferably 70 to 120°C, more preferably 80 to 110°C. The stretch blow temperature is preferably 10 to 30°C. The stretch ratio in the longitudinal direction of blow stretching is preferably 1.3 to 3.5 times. The stretch ratio in the circumferential direction is preferably 2 to 5 times. If heat setting is performed after stretching and blowing, it is preferable to use compressed air at a more suitable temperature of 100 to 200°C, more preferably 120 to 180°C, for several seconds to several minutes.

[0044] The through-hole in the conical portion 10 of the cone 91 can be drilled after the conical portion 10 has been formed. Processing methods include drilling with a cutting tool such as a drill or coping saw, drilling by heating and cutting with a laser beam or heat wire, and drilling by physical impact with a jet of water or blasting. Any method is acceptable, but a method using a cutting tool is preferred due to the clean finish and ease of handling.

[0045] Cone 91 can be used as a sign to indicate lane closures on highways, demarcation during road construction, guiding pedestrian traffic, and prohibiting entry. Cone 91 can be used for both commercial and household purposes. [Examples]

[0046] The present invention will be described in more detail below with reference to examples, but the present invention is not limited by the following examples, and can be implemented with modifications within the scope that is consistent with the spirit of the preceding and following descriptions, and all such modifications are included within the technical scope of the present invention.

[0047] (Glass transition temperature) A 5 mg sample was taken from the cone, sealed in an aluminum sample pan, and heated to 300°C at a rate of 20°C / min using a differential scanning calorimetry analyzer (DSC-220) manufactured by Seiko Instruments Inc. The glass transition temperature was defined as the intersection of the extension of the baseline on the low-temperature side and the tangent line showing the maximum slope in the transition region.

[0048] (Temperature of deflection under load) The results were obtained using an HDT test apparatus (No. 533) manufactured by Toyo Seiki Seisakusho, in accordance with Methods A and B of JIS K7191-2. In detail, first, a test specimen measuring 80 mm in length, 10 mm in width, and 3.8 to 4.2 mm in thickness was taken from the cone, and the specimen was left standing for 48 hours or more under conditions of 23°C and 55% humidity. Next, both ends of the test specimen were supported in a heated bath, and a predetermined bending stress was applied to the test specimen by a load rod in the center, while the temperature of the silicone oil (heating medium) was increased at a rate of 2°C / min. The temperature of the silicone oil (heating medium) when the deflection of the test specimen reached a predetermined amount was defined as the load deflection temperature. When taking the test specimen, the cone was cut in half to measure the thickness, and the test specimen was taken from the portion with a thickness of 3.8 to 4.2 mm. The bending stress applied to the test specimen in Methods A and B was as follows. Bending stress of method A: 1.8 MPa Bending stress in method B: 0.45 MPa

[0049] (transparency) In a room where the illuminance on the floor directly below a ceiling light with an ultra-bright function (approximately 240 cm below) was adjusted to 500 lux, a 30 cm long piece of 2x4 lumber (38 mm thick, 89 mm wide) painted white was placed inside a cone, and it was determined whether or not it could be seen from a distance of 3.0 m. If the white piece of wood could not be seen, the observer approached to 0.5 m and re-examined it to perform the evaluation described below. ○: Visible from 3m away △: Visible from 0.5m away ×: Not visible from 0.5m away

[0050] (Haze value) Haze values ​​were measured in accordance with JIS-K 7136. Specifically, samples measuring 3.0±0.2 mm in thickness, 50 mm in length, and 50 mm in width were cut from the side of the cone of each example and comparative example, and the haze values ​​were measured using a haze meter (NDH8000) manufactured by Nippon Denshoku Industries Ltd.

[0051] (Maximum load during extraction) As shown in Figure 2, two cones were stacked with the through-holes on their sides facing the same direction and placed in the center of an artificial light irradiation frame. In a room at room temperature of 20±2℃, sun lamps were placed on all four sides (left, right, front, and back) of the cones, and all four sun lamps were turned on simultaneously and left for one hour. Then, one hour after the lights were turned off, the load when pulling the stacked cone upwards was measured. A digital hanging scale manufactured by MonotaRO Co., Ltd. (model number 10931105, minimum memory 0.05kg, maximum weight 200kg) was used to measure the load, and the maximum load measured when pulling upwards was recorded. Separately, a thermometer with a thermocouple was placed between the two cones, and the ambient temperature between the two cones one hour after the lights were turned on was measured. In all examples and comparative examples, the ambient temperature was approximately 61℃.

[0052] (Moldability) The moldability of the cone when molded by injection blow molding was evaluated according to the following criteria. ○: Preforms can be molded, and the product dimensions are stable during the stretch blow blowing process. ×: While preforms can be molded, the product dimensions from the stretch blowing process are not stable.

[0053] [Polyethylene terephthalate (PET) resin] PET resin (RP553P IV0.85 (dl / g)) manufactured by Nippon Unipet Co., Ltd. was blow-molded into bottles, then crushed to form PET bottle flakes, which were used as polyethylene terephthalate (PET) resin. [Polyethylene naphthalate (PEN) resin] Polyethylene naphthalate resin manufactured by Teijin Limited (Teonex TN8050SC, MVR18(cm) 3 (10 min) Measurement conditions: 300°C, 1.2 kgf) was used as the polyethylene naphthalate (PEN) resin.

[0054] [Example 1] 85 parts by mass of PET resin and 15 parts by mass of PEN resin were mixed, and the resin composition was dried in a vacuum dryer at 130°C for 6 hours under conditions of 0.2 kPa or less. Then, using an AOKI series injection stretch blow molding machine manufactured by Aoki Solid Materials Laboratory, the resin temperature was 290°C, the mold temperature was 20°C, the pre-blow stretching temperature of the preform obtained by injection molding was 95°C, the stretch blowing temperature was 15°C, the longitudinal stretching ratio was 1.428 times, the circumferential stretching ratio was 2.5 times, and the blow pressure was 20 kg / cm². 2 A cone having a conical section and a base section was fabricated under the specified conditions. The height of the cone was 70 cm and its mass was 1.3 kg. Next, through holes with a diameter of φ20 mm were formed at the lower part of the side surface of the conical section and at the top of the conical section.

[0055] [Example 2] A cone was prepared in the same manner as in Example 1, except that 80 parts by mass of PET resin and 20 parts by mass of PEN resin were mixed.

[0056] [Example 3] A cone was prepared in the same manner as in Example 1, except that 50 parts by mass of PET resin and 50 parts by weight of PEN resin were mixed.

[0057] [Example 4] A cone was prepared in the same manner as in Example 1, except that 20 parts by mass of PET resin and 80 parts by mass of PEN resin were mixed.

[0058] [Example 5] A cone was prepared in the same manner as in Example 1, except that 15 parts by mass of PET resin and 85 parts by mass of PEN resin were mixed.

[0059] [Comparative Example 1] A cone was prepared in the same manner as in Example 1, except that 100 parts by mass of PET resin was used as the resin composition.

[0060] [Comparative Example 2] A cone was prepared in the same manner as in Example 1, except that 95 parts by mass of PET resin and 5 parts by mass of PEN resin were mixed.

[0061] [Comparative Example 3] The cone was prepared in the same manner as in Example 1, except that 90 parts by mass of PET resin and 10 parts by mass of PEN resin were mixed.

[0062] [Comparative Example 4] A cone was prepared in the same manner as in Example 1, except that 100 parts of PEN resin were used as the resin composition.

[0063] Table 1 shows the measurement and evaluation results for each physical property of the cones in Examples 1-5 and Comparative Examples 1-4.

[0064] [Table 1]

[0065] As shown in Table 1, the cones of Examples 1 to 5, in which the mass ratio of polyethylene terephthalate to polyethylene naphthalate was 85:15 to 15:85, exhibited good moldability and reduced the maximum load during extraction after being left under solar light irradiation. [Explanation of Symbols]

[0066] 1H 1st through hole 2H 2nd through hole 1F First mating section 2F Second Fitting Section 10 Conical part 11 Side view 11T Top 11U bottom 12 Top 13 Transparent part 20 Base section 21 Plate-shaped part 22 Stepped section 30 Corn Weight 91 Corn V Vertical direction

Claims

1. A cone having a conical portion, The aforementioned conical portion contains polyethylene terephthalate and polyethylene naphthalate. A cone having a mass ratio of polyethylene terephthalate to polyethylene naphthalate of 85:15 to 15:

85.

2. The cone according to claim 1, wherein the conical portion has a transparent portion, and the haze value at a thickness of 3 mm of the transparent portion is 35% or less.

3. The cone according to claim 1 or 2, wherein the lower part of the side surface of the conical portion has a first through hole.

4. The cone according to claim 3, wherein the top of the conical portion has a second through hole.

5. Furthermore, it has a base portion, and the conical portion is positioned on the base portion. The conical portion, the base portion, or both thereof have a first fitting portion, The conical portion, the base portion, or both thereof have a second fitting portion having a shape that can be fitted with the first fitting portion. The cone according to claim 1 or 2, wherein the first fitting portion and the second fitting portion have overlapping portions in the vertical direction.

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