Manufacturing method for labeled resin container

Abstract

To provide a production method of a resin container with a label allowing defects in labeling quality to be prevented.SOLUTION: A production method of a resin container with a label according to the present invention is provided with a cooling step, a warming step, and a labeling step. The cooling step is to cool the resin container after blow molding, the warming step is to warm the resin container after the cooling step, and the labeling step is to attach a label onto a surface of the resin container after the warming step. In the warming step, warm air equal to 60°C or lower may be introduced around the resin container to warm the resin container. In the cooling step, cool air equal to 15°C or lower may be blew on the surface of the resin container.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method for manufacturing a labeled resin container. [Background technology]

[0002] Patent Document 1 discloses a resin container with a label. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-151336 Summary of the Invention [Problem to be solved by the invention]

[0004] In the manufacturing process of labeled resin containers, unexpected defects occurred in the labels after the labeling process. The inventors conducted extensive research involving various trial and error without being able to determine the cause of the defects, and discovered a method for suppressing the defects in the quality of the labels attached.

[0005] The present invention has been made in view of the above circumstances, and aims to provide a method for manufacturing labeled resin containers that can suppress poor quality label attachment. [Means for solving the problem]

[0006] According to the present invention, there is provided a method for manufacturing a labeled resin container, comprising a cooling process, a heating process, and an attachment process, wherein the cooling process cools the resin container after blow molding, the heating process warms the resin container after the cooling process, and the attachment process attaches a label to the surface of the resin container after the heating process.

[0007] The inventors discovered that good labeling quality can be achieved by cooling and warming the blow-molded resin container before labeling, leading to the completion of the present invention. This invention makes it possible to prevent defects in the labels after the labeling process.

[0008] Various embodiments of the present invention will be described below as examples, and the embodiments shown below can be combined with each other. Preferably, the heating step heats the resin container by introducing hot air at 60° C. or less around the resin container. Preferably, the cooling step involves blowing cold air at 15° C. or less onto the surface of the resin container. Preferably, the attaching step attaches the label to the surface of the resin container with a drying and solidifying adhesive. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram showing a manufacturing apparatus for labeled resin containers. [Figure 2] FIG. 2A is a top view of an example of a labeled resin container, FIG. 2B is a view of an example of a labeled resin container viewed from the label side, and FIG. 2C is a view of an example of a labeled resin container viewed from the handle side. DETAILED DESCRIPTION OF THE INVENTION

[0010] The following describes embodiments of the present invention. The various features shown in the following embodiments can be combined with each other. Furthermore, each feature can be an invention independently.

[0011] 1. Manufacturing equipment FIG. 1 shows a manufacturing apparatus 1 to which the manufacturing method of the embodiment can be applied. The manufacturing apparatus 1 includes a blow molding machine 2, a conveyor 3, a cooling area 4a, an opening 4b, a heating area 4c, a leak detector 5, a weight checker 6, a label application device 7, and an aligner 8. The blow molding machine 2 may be an injection blow molding machine or a direct blow molding machine. The conveyor 3 transports the resin container bodies molded by the blow molding machine 2. During transportation on the conveyor 3, the resin containers pass from the cooling area 4a to the aligner 8 in the order listed above.

[0012] 2A to 2C show an example of a resin container body 11 according to an embodiment. The resin container body 11 includes a mouth portion 12, a body portion 13, and a handle portion 14. A label 19 is attached to a side surface 13a of the body portion 13. Details of the resin container body 11 will be described later.

[0013] The cooling area 4a is, for example, a spot cooler. The spot cooler may blow cooling air onto the resin container body 11. However, this is not limiting, and any device that adjusts the ambient temperature within the closed space of the cooling area 4a to a constant cold temperature may be used, such as an air conditioner or a low-temperature thermostatic bath. The open portion 4b is, for example, a room temperature area surrounded by any plate material such as an acrylic plate. In this embodiment, the area 4b1 enclosed by the dashed line frame in Figure 1 is open. The heating area 4c is, for example, a heater that directs hot air from a heater to the periphery of the resin container body 11.

[0014] The leak detector 5 and the weight checker 6 perform leak inspections and weight inspections of the resin container body 11. The labeling device 7 attaches a label 19 to the surface (specifically, the side surface 13a, as an example) of the resin container body 11. The aligner 8 aligns and stores the resin container bodies 11 after the labels have been attached.

[0015] 2.Configuration of labeled resin container As an example, the resin container body 11 has an elliptical shape in a plan view as shown in Fig. 2A, with the lower portion being an elliptical cylinder and approximately half of the upper portion being the handle portion 14. In the embodiment, as an example, a label 19 is attached to a gently sloping side surface 13a along the major axis of the ellipse among the side surfaces of the body portion 13. A cap (not shown) is attached to the mouth portion 12 of the resin container body 11 shown in Figs. 2A to 2C to provide a resin container.

[0016] The material of the resin container body 11 is, for example, a polyolefin layer containing polyolefin. The content of polyolefin in the resin constituting the polyolefin layer is, for example, 50 to 100% by mass, specifically, for example, 50, 60, 70, 80, 90, or 100% by mass, and may be within a range between any two of the values ​​exemplified here. Examples of polyolefins include low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), high-density polyethylene (HDPE), polypropylene (PP), copolymers of propylene and other olefins (e.g., ethylene) (random copolymers or block copolymers; hereinafter, random copolymers are referred to as "random polypropylene"), cyclic polyolefins (COP), and mixtures thereof. The resin container body 11 may be provided in multiple colors by adding different masterbatches.

[0017] The capacity of the resin container body 11 (more specifically, the capacity of the barrel 13) is not particularly limited, but is, for example, 1.0 to 5.0 liters, and preferably 2.0 to 4.0 liters. Specific examples of the capacity of the resin container body 11 are 1.0, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, and 5.0 liters, and may be within a range between any two of the numerical values ​​exemplified here.

[0018] Thickness D of mouth 12 Ais, for example, 1.5 mm or more, for example, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5 mm, and may be within a range between any two of the values ​​exemplified here. On the other hand, the body portion 13 is also the portion that expands during blow molding, and is therefore thin-walled. The wall thickness D of the body portion 13 B The thickness ratio D of the mouth portion 12 to the body portion 13 is, for example, 1 mm or less, and may be, for example, 0.5, 0.6, 0.7, 0.8, 0.9, or 1.0 mm, or may be within a range between any two of the values ​​exemplified here. A / D B is, for example, 1.5 or more, for example, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, and may be within a range between any two of the values ​​exemplified here. A , D B Each of these may be defined as a minimum or maximum thickness, or may be defined as an average thickness. In the case of an average thickness, the arithmetic mean may be calculated from the thicknesses of multiple locations along the circumferential direction for each portion.

[0019] The adhesive of the label 19 may be, for example, an emulsion or latex type, specifically an acrylic resin emulsion type or a rubber latex type, or may be a dry-to-solidify type, but is not limited to these, and any other adhesive may be used, such as a solvent type or a reactive type, or a reaction-hardening type adhesive.

[0020] The resin container body 11 can be modified in various ways. The planar shape corresponding to FIG. 2A is not limited to an ellipse, but may be a circle, a rectangle, or a polygon (with rounded corners). It may be tapered from any position in the height direction toward the opening. The handle 14 may be omitted.

[0021] 3. Manufacturing method A manufacturing method according to one embodiment of the present invention will be described using the manufacturing apparatus 1 in Fig. 1. The method according to this embodiment comprises a cooling step, a heating step, and an attachment step. These steps will be described in detail below.

[0022] 3-1. Cooling process In the cooling step, the resin container body 11 after being blow-molded by the blow molding machine 2 is cooled in the cooling area 4a. In the cooling step of the embodiment, for example, a spot cooler applies cool air (cold wind) of 15°C or less to the surface of the resin container body 11. The "surface" to which the cool air is applied includes any flat, curved, end, or uneven surface of the resin container body 11 exposed to the outside. The surface to which the cool air is applied is not limited to the surface of the body 13, but may also include the upper end surface or peripheral side surface (male thread portion) of the mouth 12, and may also include the surface of the handle 14. In the embodiment, for example, the cool air is applied from above the resin container body 11 toward the mouth 12 and the handle 14. The temperature of the cool air is arbitrary, but is, for example, 5°C to 25°C, and preferably 10°C to 15°C. Specific examples of the cold air temperature include 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, and 25°C, and may be within a range between any two of the values ​​exemplified here.

[0023] The time it takes for the resin container body 11 to cool in the cooling area 4a is also simply referred to as the cooling time. The cooling time is, for example, 30 to 150 seconds, preferably 60 to 90 seconds, and specifically 70 seconds (1 minute 10 seconds). Specific examples of the cooling time are 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, and 150 seconds, and may be within a range between any two of the values ​​exemplified here.

[0024] The surface temperature of the resin container body 11 at the end of the cooling step, i.e., at the outlet of the cooling area 4a (temperature at the end of cooling) is, for example, 10 to 25° C., and may be, for example, about 15 to 20° C. Specifically, the temperature at the end of cooling is, for example, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, or 25° C., and may be within a range between any two of the values ​​exemplified here.

[0025] In the cooling process of the embodiment, a thermal history (i.e., a temperature decrease history or a cooling history) is given to the resin container body 11. The thermal history by the cooling process may be "to decrease the surface temperature of the resin container body 11 at the start of the cooling process (at the entrance to the cooling area 4a) to a surface temperature at the end of cooling that is specified in the above numerical range for a cooling time that is specified in the above numerical range."

[0026] The spot cooler is an example, and the cooling method is not limited. Generally, any cooling means may be used, and a specific means may be, for example, contacting cold air with the resin container body 11. The contact with cold air may be achieved by directly applying cold air, or by guiding cold air around the resin container body 11, thereby cooling the resin container body 11 without directly applying cold air. Any refrigerant may be used, and as an example, low-temperature gas may be applied to the surface of the resin container body 11 at a predetermined wind speed. Alternatively, instead of directly applying cold air to the surface of the resin container body 11, the resin container body 11 may be exposed to a low-temperature atmosphere using an air conditioner or a low-temperature thermostatic bath, so that the surface of the resin container body 11 comes into contact with cold air.

[0027] 3-2.Heating process In the heating step, the resin container body 11 is heated in the heating area 4c after the cooling step. In the heating step of the embodiment, for example, the resin container body 11 is heated by directing hot air of 60°C or less (for example, heated air of 50°C) around the resin container body 11 in the heating area 4c. In the embodiment, for example, a hot air outlet is provided above the resin container body 11, and the hot air is blown downward from the outlet. At this time, the hot air may be directed from below to the periphery of the resin container body 11 while changing direction from left to right, or the hot air from the outlet may not directly hit the resin container body 11. The heating area 4c into which the hot air is directed is filled with hot air, and the surface of the resin container body 11 is exposed to the hot air. The temperature of the hot air in the heating area 4c is arbitrary, but is, for example, 35°C to 70°C, and preferably 50°C to 60°C. Specifically, the temperature of the hot air is, for example, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, or 70° C., and may be within a range between any two of the values ​​exemplified here. Note that excessive reheating of the resin container body 11 may cause melting, softening, deformation, or the like, so an upper limit temperature may be specified to avoid this, and the upper limit temperature may be set at, for example, 60° C.

[0028] The time during which the resin container body 11 is heated in the heating area 4c is also simply referred to as the heating time. The heating time is, for example, 30 to 180 seconds, preferably 60 to 90 seconds, and specifically 110 seconds (1 minute 50 seconds). Specific examples of the heating time are 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, and 180 seconds, and may be within a range between any two of the values ​​exemplified here.

[0029] The surface temperature of the resin container body 11 at the end of the heating step, i.e., at the outlet of the heating area 4c (temperature at the end of heating), is, for example, 30 to 50° C., and may be, for example, about 35 to 40° C. Specifically, the temperature at the end of heating is, for example, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, or 50° C., and may be within a range between any two of the values ​​exemplified here. The temperature at the end of heating does not necessarily have to be the same as room temperature.

[0030] In the heating step of the embodiment, a thermal history (temperature rise history) is given to the resin container body 11. The thermal history by the heating step may be "raising the surface temperature of the resin container body 11 at the start of the heating step (at the entrance of the heating area 4c) to a surface temperature at the end of heating that is specified in the above numerical range for a heating time that is specified in the above numerical range."

[0031] The heating step described above is an example, and the heating method is not limited. Generally, any heating means may be used, and a specific means may be, for example, contacting the heated gas with the resin container body 11. The contact with the heated gas may be achieved by directly applying hot air, or by guiding hot air around the resin container body 11 to heat the resin container body 11 without directly applying the heated gas. Any heat medium or thermal fluid may be used. As an example, any heated gas may be directly applied to the surface of the resin container body 11 at a predetermined wind speed (i.e., hot air may be directly applied). Alternatively, the resin container body 11 may be exposed to a high-temperature atmosphere in a thermostatic chamber or the like in a windless or low-speed wind state, so that the heated gas comes into contact with the surface of the resin container body 11. The heated gas may be any gas, such as air or other gases (e.g., inert gases), that have been heated.

[0032] 3-3. Application process In the attachment step, after the heating step, the label 19 is attached to the surface of the resin container body 11. The "surface" to which the label 19 is attached refers to any part of the body 13 of the resin container body 11, and in the embodiment, as an example, it is the side surface 13a of the body 13. In the attachment step of the embodiment, as an example, the label 19 is attached to the surface of the resin container body 11 with a dry-solidifying adhesive.

[0033] The method of the embodiment described above can suppress defects in the quality of label application. This can suppress defects (such as peeling or wrinkles) in the label 19 after the application process. This defect suppression effect is thought to be due to the surface condition of the resin container body 11 being modified by the thermal history of the cooling process and heating process before label application.

[0034] Furthermore, in the heating step of the embodiment, by setting the temperature of the hot air to 60° C. or less, it is possible to suppress deformation of the resin container body 11 and also suppress defective label attachment.

[0035] Furthermore, in the cooling process of the embodiment, the resin container body 11 can be rapidly cooled by applying cold air of 15°C or less in the cooling area 4a, thereby suppressing shrinkage of the mouth portion 12. If the mouth portion 12 shrinks significantly, there is a problem that the circularity of the mouth portion 12 decreases in the plan view of FIG. 2A, but the embodiment has the advantage of being able to reduce mouth shrinkage. Note that although the shrinkage rate differs depending on the resin material (for example, the type of masterbatch), rapid cooling has the advantage of being able to quickly cool the resin container body 11 while suppressing mouth shrinkage regardless of the resin material.

[0036] According to the embodiment, the cooling process cools the high-temperature resin container body 11 immediately after blow molding, which is advantageous in that it shortens the time from the blow molding process to the labeling process. The method of the embodiment also has the advantage of suppressing condensation that can occur on the surface of the low-temperature resin container body 11 in a high-humidity atmosphere.

[0037] The transit time through each area may be set as follows. In the example of FIG. 1, the cooling area 4a is designed to be shorter than the heating area 4c. When the conveyor 3 is set to a constant transport speed, the cooling time in the cooling area 4a is shorter than the heating time in the heating area 4c. As another example, the cooling time in the cooling area 4a may be longer, or the cooling time and the heating time may be the same.

[0038] The airflow direction and intensity of the spot cooler and hot air blower described above can be varied. For example, the hot air blower may blow hot air from any direction toward the resin container body 11 being transported by the conveyor 3. Hot air may be blown toward the resin container body 11 on the conveyor 3 from any one or more of the following directions: above, below, horizontally, diagonally above, and diagonally below. When blowing hot air horizontally or diagonally up and down, for example, the hot air may be directed toward the side surface 13a of the resin container body 11, particularly toward the area where the label 19 is attached. Alternatively, specifically, if the traveling direction of the conveyor 3 is considered to be the front of the resin container body 11, the hot air may be blown from any one or more of the front, back, left, right, and right directions of the resin container body 11. The strength, i.e., the speed, of the hot air is not limited. For example, the strength may be strong enough to blow away foreign matter adhering to the surface of the resin container body 11. The variations in the airflow direction and intensity described above may also be applied to the cold air of a spot cooler.

[0039] In addition, the normal temperature area defined by the open portion 4b is not actively cooled or heated, and ventilation with the outside of the open portion 4b can be achieved through the portion 4b1. The open portion 4b has the effect of preventing cold air from being transmitted to the heated area 4c and preventing heated gas (hot air) from being transmitted to the cooled area 4a. The normal temperature area is within a temperature range between the cooled area 4a and the heated area 4c. The normal temperature atmosphere in the open portion 4b may be, for example, 15°C to 35°C, or 15°C to 25°C, or 20°C to 30°C. In another example, the normal temperature range may have an upper limit of 35°C and a lower limit of a predetermined temperature higher than the temperature in the cooled area 4a. Alternatively, the open portion 4b may be omitted and the cooled area 4a and the heated area 4c may be connected. [Example]

[0040] [Table 1]

[0041] Table 1 shows test results for resin container bodies 11 (before label attachment) manufactured using the manufacturing apparatus 1 of Figure 1, with different cooling and heating conditions. The resin container bodies 11 were directly blow-molded using a blow molding machine 2. Polyethylene was used as the resin material. The resin container bodies 11 removed from the blow molding machine 2 had a mouth 12 that was approximately 100°C and a body 13 that was approximately 40°C to 50°C. Heat dissipation occurred from the resin container body 11 on the conveyor 3 between the outlet of the blow molding machine 2 and the entrance to the cooling area 4a. The mouth 12 requires a certain degree of rigidity to fit a cap, and tends to have a large wall thickness. In contrast, the body 13 is the part that expands during blow molding, and is therefore thin-walled. In the examples, as an example, the wall thickness D of the mouth 12 is A is 1.5 mm, and the wall thickness D B is 1 mm, and the thickness ratio D A / D B is 1.5. The mouth portion 12 has a large amount of resin, so it is difficult to cool down and the mouth portion 12 becomes very hot.

[0042] The cooling conditions will be described. When the resin container body 11 entered the cooling area 4a, different cooling processes were carried out on the resin container body 11 in Comparative Examples A1 to A3, Comparative Example B, and the Example. The difference between "rapid cooling" and "gradual cooling" described in the "with or without cooling" section will be described. In the "rapid cooling" cooling mode, the resin container body 11 is cooled rapidly by low-temperature cold air, and the cooling rate (i.e., the amount of temperature drop of the resin container body 11 over time) is relatively high. In the Example, rapid cooling is carried out by applying cold air at 12°C. In contrast, in the "gradual cooling" cooling mode, the resin container body 11 is cooled slowly by guiding warm air at room temperature to about 50°C around the resin container body 11, and the cooling rate is slower than that of rapid cooling. The cooling time for each is the cooling time t A1 , t A2is the longest, and the cooling time t E The relationship between the length of each cooling time is "t E <t A3 <t B <t A1 =t A2 "

[0043] The heating conditions will be described. The "non-heated" samples of Comparative Examples A1 to B were transported in the heating area 4c without heating (hot air fan off) and then transported as is to the labeling device 7. For the "heated" samples of the example, in the heating area 4c, hot air was guided from an air outlet provided above the resin container body 11 while changing its air direction from left to right, so that the hot air from the air outlet was guided around the resin container body 11 without directly hitting the resin container body 11. The resin container body 11 after the heating process was transported to the labeling device 7. The temperature of the heated air was set to approximately 50°C. In the labeling device 7, a label 19 was attached using an acrylic emulsion-type drying and solidifying adhesive.

[0044] In the comparative examples A1 and A2, cooling (rapid cooling) was performed in the cooling step, and the cooling time t A1 , t A2 The cooling time was the longest among all samples, specifically 4 minutes 37 seconds. As a result, the mouth portion 12 and body portion 13 were cooled to approximately 12°C by the end of cooling (i.e., at the exit of the cooling area 4a). The resin container bodies 11 were then transported without heating, and the temperature of the resin container bodies 11 increased during the transport process due to exposure to a room-temperature atmosphere, and the labeling process was carried out in the labeling device 7. The time required for transport from the blow molding machine 2 to the labeling device 7 was 7 minutes 2 seconds. The difference between Comparative Examples A1 and A2 was the storage conditions of the resin container bodies 11 aligned in the alignment device 8 after the labeling process. In Comparative Example A1, the storage temperature was approximately 30°C to 35°C, and the humidity was high. In Comparative Example A2, the storage temperature was approximately 20°C, and the humidity was 60%.

[0045] In Comparative Example A3, cooling (rapid cooling) was performed in the cooling step, and the cooling time tA3 was set to a medium level. A3 is t A1 ,tA2 The cooling time t E The temperature of the body 13 at the end of cooling was estimated to be around 20°C. After that, the resin container was transported without heating, and the temperature of the resin container body 11 rose due to exposure to a room temperature atmosphere during the transport process, and the labeling process was carried out by the labeling device 7.

[0046] In Comparative Example B, cooling (slow cooling) was performed in the cooling step, and the cooling time t B At the end of cooling, the temperature of the mouth portion 12 was about 50° C., and the temperature of the body portion 13 was about 37 to 38° C. Thereafter, the product was transported without heating, and the labeling process was carried out in the labeling device 7.

[0047] In the embodiment, cooling (rapid cooling) is performed in the cooling step, and the shortest cooling time t E Specifically, the cooling time t E The cooling time was 1 minute and 10 seconds. The temperature of the body portion 13 at the end of cooling was estimated to be approximately 20 to 25°C. After that, heating was performed in the heating area 4c. The heating time (the time required to pass through the heating area 4c) was 1 minute and 50 seconds. The mouth temperature immediately after the heating process was approximately 50°C, and the body temperature was approximately 37 to 38°C. After heating, the resin container body 11 was further transported by the conveyor 3, and the labeling process was performed in the labeling device 7. The time required for transport from the blow molding machine 2 to the labeling device 7 was 7 minutes and 2 seconds.

[0048] The evaluation was on a three-point scale: "Good", "Intermediate", and "Poor". Looking at the results, the label quality in the Examples was rated as "Good", and the "mouth shrinkage" was also rated as "Good". The smaller the mouth shrinkage, the better the circularity is maintained and the evaluation is "Good". If the mouth shrinkage is large, the mouth 12 becomes elliptical or the like and is rated as "Poor". The comparative example samples were rated as "Poor" in one of the two ways. The label quality defects were peeling and wrinkles of the label after application. The results of the Examples showed that heating improves label quality, and that rapid cooling improves the state of mouth shrinkage. In the Examples with rapid cooling and heating, both mouth shrinkage and label quality were achieved.

[0049] Furthermore, in the examples, in order to speed up the molding cycle, the cooling time in the mold was shortened, and the resin container body 11 was removed from the mold before cooling in the mold was complete, and cooling (cooling process) was performed outside the mold. This example confirmed that both molding quality and label quality could be achieved while speeding up the molding cycle. More specifically, in typical blow molding, the container is shaped in the mold, cooled to a certain temperature, and then removed, which has the disadvantage of requiring a long cooling time within the molding cycle. Another labeling method, in addition to the post-molding method described in the embodiments, is an in-mold method, in which the label is attached to the mold and molded as a single unit. This in-mold method also has the disadvantage of lengthening the molding cycle due to the additional step of setting the label in the mold and requiring dedicated mounting equipment. In comparison, in the examples, the cooling time in the mold was shortened, the container was removed from the mold before cooling was complete, and cooling (cooling process) was then performed outside the mold. By combining this with a heating process, the above-mentioned good label quality, etc., was also achieved. As described above, the examples confirmed the effect of shortening the molding cycle while ensuring both molding quality and label attachment quality.

[0050] The evaluation criteria for the mouth shrinkage are as follows: A mouth 12 that conforms to the standard of a screw diameter of 37.2 mm±0.4 mm is evaluated as ○; a mouth that does not conform to the standard is evaluated as ×.

[0051] Label lifting was checked for the resin container body 11 24 hours after blow molding. The evaluation criteria for label quality were as follows: Vertical label lifting (lifting of the label 19 along the vertical direction of the paper in Figure 2B) tended to occur easily. ○: No floating or floating width 5mm x length less than 5mm △: Float width 5mm x length 5mm ~ width 5mm x length 20mm ×: Float width 5mm x length 20mm or more [Explanation of symbols]

[0052] 1: Manufacturing equipment 2: Blow molding machine 3: Conveyor 4a: Cooling area 4b:Open part 4c: Heated area 5: Leak detector 6: Weight checker 7: Labeling device 8: Alignment machine 11: Resin container body 12: Mouth 13: Torso 13a: Side 14: Handle 19: Label

Claims

1. A method for manufacturing a labeled resin container, comprising: The method includes a cooling step, a heating step, and an attachment step, and is carried out using a manufacturing apparatus; the manufacturing apparatus includes a blow molding machine, a conveyor, a cooling area, a heating area, and a labeling device; In the cooling step, the resin container blown by the blow molding machine is transported to the cooling area by the conveyor and cooled in the cooling area. In the heating step, after the cooling step, the resin container is transported to the heating area by the conveyor and heated in the heating area. In the labeling step, after the heating step, the resin container is transported by the conveyor to the labeling device, and a label is attached to the surface of the resin container by the labeling device; In the cooling step, the resin container is cooled by blowing cold air having a temperature of 5°C or higher and 25°C or lower onto a surface of the resin container; The time for cooling the resin container in the cooling step is 30 to 150 seconds, In the heating step, the resin container is heated by introducing hot air having a temperature of 35°C or higher and 70°C or lower around the resin container, The method, wherein the resin container is heated for 30 to 180 seconds in the heating step.

2. 10. The method of claim 1, In the attaching step, the label is attached to the surface of the resin container using a drying and solidifying adhesive (unless the drying and solidifying adhesive is dried and solidified before attaching the label to the surface of the resin container).

3. 3. The method of claim 1 or claim 2, The temperature of the cold air is 10°C or higher and 15°C or lower, The method, wherein the temperature of the hot air is 40°C or higher and 60°C or lower.

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