JP2022131829A - Manufacturing method of synthetic resin container - Google Patents

Abstract

To provide a manufacturing method of a synthetic resin container by blow-molding, which suppresses a product defect caused by an embedded member.SOLUTION: A manufacturing method of a synthetic resin container 200 comprises the steps of: forming a bottomed cylindrical preform 100; and blow-molding the preform 100 to form the synthetic resin container 200, wherein embedded members are embedded in the preform 100 and the synthetic resin container 200, and a ratio of a thickness of the preform 100 to a thickness of the synthetic resin container 200 at a portion where the embedded member is embedded is greater than 1.0 and 2.5 or less.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a method for manufacturing a synthetic resin container.

In recent years, counterfeit products such as luxury cosmetics have been distributed, and there is a demand for the development of a method for discriminating genuine products. In order to solve this problem, for example, a contactless IC tag called RFID (Radio Frequency Identification) is mounted on the container, and various data are written to and read from the RFID using a dedicated communication device. Accordingly, it has been proposed to manage merchandise and physical distribution (for example, Patent Literature 1).

JP 2010-105719 A

In the synthetic resin container described in Patent Document 1, the IC tag is embedded in the container by performing insert molding using a resin insert material body and the IC tag as insert materials. If IC tags can be embedded in blow-molded containers, there will be a wide variety of containers with embedded IC tags, and containers can be manufactured at low cost. There is room for improvement in this respect, as it may have been a factor in shortages.

The present disclosure has been made in view of such problems, and an object thereof is to provide a method of manufacturing a synthetic resin container by blow molding that suppresses product defects caused by embedded members.

The manufacturing method of the synthetic resin container of the present disclosure includes:
forming a bottomed tubular preform;
Blow molding the preform to form a synthetic resin container;
An embedding member is embedded in the preform and the synthetic resin container,
A ratio of the thickness of the preform to the thickness of the synthetic resin container at the portion where the embedded member is embedded is more than 1.0 and less than or equal to 2.5.

Further, in the method for manufacturing a synthetic resin container of the present disclosure, in the above configuration, the thickness direction of the synthetic resin container of the embedded member relative to the thickness of the synthetic resin container at the portion where the embedded member is embedded is preferably 0.5 or less.

Further, in the method for manufacturing a synthetic resin container of the present disclosure, in the above configuration, the preform has an outer body and an inner body provided inside the outer body, and the embedded member comprises the outer body and the inner body.

Further, in the method for manufacturing a synthetic resin container of the present disclosure, in the above configuration, the step of forming the preform includes the step of insert-molding the inner body using the embedded member as an insert material, and the step of forming the outer body. and placing the inner body inside the outer body.

Further, in the method for manufacturing a synthetic resin container of the present disclosure, in the configuration described above, it is preferable that the embedded member is an RFID.

Further, in the method for manufacturing a synthetic resin container of the present disclosure, in the configuration described above, it is preferable that the embedding member is embedded in the trunk portion of the synthetic resin container.

According to the present disclosure, it is possible to provide a method for manufacturing a synthetic resin container by blow molding that suppresses product defects caused by embedded members.

1 is a front cross-sectional view of a synthetic resin container formed by a synthetic resin container manufacturing method according to an embodiment of the present disclosure; FIG. 1 is a front cross-sectional view of a preform used in a synthetic resin container manufacturing method according to an embodiment of the present disclosure; FIG. 3 is a front cross-sectional view of an inner body used to form the preform of FIG. 2; FIG. 1 is a flow chart showing procedures for carrying out a method for manufacturing a synthetic resin container according to an embodiment of the present disclosure.

Hereinafter, the present disclosure will be described more specifically by way of example with reference to the drawings.

A method for manufacturing a synthetic resin container 200, which is an embodiment of the present disclosure, manufactures the synthetic resin container 200 by blow-molding the preform 100 shown in FIG. The synthetic resin container 200, as shown in FIG. It has

In the present specification, claims, and drawings, the vertical direction means upward and downward directions when the synthetic resin container 200 is in an upright position as shown in FIG. In addition, the radially outer side is a direction away from the central axis O along a straight line that passes through the central axis O of the synthetic resin container 200 in FIG. shall mean the direction along toward the central axis O.

As shown in FIG. 1, the mouth portion 111 has a substantially cylindrical outer peripheral wall 111b. The outer surface of the outer peripheral wall 111b is formed with a male screw portion 111a for detachably attaching a lid, a pump, or the like. ing. Instead of the externally threaded portion 111a, an engagement projection projecting radially outward from the outer peripheral wall 111b may be provided so that a lid, a pump, or the like can be attached by plugging.

An annular neck ring 112 projecting radially outward is provided at the lower portion of the mouth portion 111 . The neck ring 112 is also provided on the preform 100 as the neck ring 12, and the preform 100 can be fixed to the mold by abutting the neck ring 12 of the preform 100 against the reference surface of the blow molding mold. can.

A body portion 133 is connected to the lower end portion of the neck ring 112 via a shoulder portion 132 . As shown in FIG. 1, the trunk portion 133 has a substantially cylindrical shape, and a storage space S for contents is formed inside in the radial direction thereof. As illustrated, the synthetic resin container 200 according to this embodiment has a laminated structure including an outer layer body 130b and an inner layer body 130a from a shoulder portion 132 to a bottom portion 134. As shown in FIG. That is, the body portion 133 of the synthetic resin container 200 includes the body portion outer layer 123 of the outer layer body 130b and the body portion inner layer 113 of the inner layer body 130a. Similarly, shoulder 132 comprises shoulder outer layer 121 of outer layer body 130b and shoulder inner layer 113b of inner layer body 130a. Note that the mouth portion 111 may also have a laminated structure composed of the outer layer body 130b and the inner layer body 130a.

The RFID 30 is fitted and fixed to the body inner layer 113 as shown in FIG. In this embodiment, the RFID 30 is fitted in a recess 113a formed in the outer surface of the trunk inner layer 113, and is arranged so that the radially outer end of the RFID 30 is substantially at the same radial position as the outer surface of the trunk inner layer 113. It is The RFID 30 is arranged between the outer layer body 130b and the inner layer body 130a by covering the inner layer body 130a of the trunk portion 133 from the radially outer side with the outer layer body 130b.

In this embodiment, the ratio of the thickness of the synthetic resin container 200 of the RFID 30 in the thickness direction to the thickness of the synthetic resin container 200 at the portion where the RFID 30 is embedded is configured to be 0.5 or less. ing. With such a configuration, it is possible to suppress the occurrence of poor appearance, insufficient drop strength, and the like due to distortion of the periphery of the RFID 30 when the preform 100 is blow-molded.

A bottom portion 134 that closes the housing space S from below is provided at the lower end portion of the trunk portion 133 of the synthetic resin container 200 . Bottom 134 comprises bottom outer layer 124 of outer body 130b and bottom inner layer 114 of inner body 130a. As shown in FIG. 1, the bottom outer layer 124 of the outer layer body 130b is raised on the inner side in the radial direction. It can be maintained upright.

In the present embodiment, the RFID 30 is arranged between the outer layer body 130b and the inner layer body 130a of the trunk portion 133, but the configuration is not limited to this. The RFID 30 may be arranged on the mouth portion 111 , the shoulder portion 132 or the bottom portion 134 other than the body portion 133 . Further, the RFID 30 does not necessarily have to be fitted in the recess 113a provided in the inner layer body 130a, and may be fitted in a recess provided in the outer layer body 130b. It may also fit into a recess. Alternatively, the RFID 30 may be embedded in either the inner layer body 130a or the outer layer body 130b, and may be configured so as not to contact the other of the inner layer body 130a and the outer layer body 130b.

It is preferable that the RFID 30 is not exposed on either the outer surface or the inner surface of the synthetic resin container 200 . If the RFID 30 is exposed on the outer surface of the synthetic resin container 200, the RFID 30 can be visually recognized by the user, which may impair the design of the container and may interfere with decoration. Moreover, there is a possibility that the original function cannot be exhibited due to the removal of the RFID 30 .

Also, if the RFID 30 is exposed to the inner surface of the synthetic resin container 200, it is necessary to ensure that the main body of the RFID 30, the package, and the like do not affect the contents.

For example, if the synthetic resin container 200 is a delaminating container in which the inner layer 130a is reduced in volume and deformed according to the remaining content, the RFID 30 is preferably arranged on the inner surface of the outer layer 130b. Further, the synthetic resin container 200 may not have a laminated structure including the outer layer body 130b and the inner layer body 130a.

As the material of the outer layer body 130b, for example, polyethylene terephthalate (PET) resin can be used, as well as other polyester resins (PEN, PBT, PTT, etc.), polyolefin resins (PP, PE, etc.), nylon resins ( PA6, PA66, MXD6, etc.), polycarbonate resin (PC), cycloolefin copolymer resin (COC), cycloolefin polymer resin (COP), and other synthetic resin materials can also be employed.

As the material of the inner layer body 130a, for example, polyethylene terephthalate resin can be used, as well as other polyester resins (PEN, PBT, PTT, etc.), polyolefin resins (PP, PE, etc.), nylon resins (PA6, PA66, MXD6, etc.), polycarbonate resin (PC), cycloolefin copolymer resin (COC), cycloolefin polymer resin (COP), ethylene-vinyl alcohol copolymer resin (EVOH), etc. can also When EVOH is used as the material for the inner layer body 130a, one having an appropriate ethylene content can be adopted in consideration of barrier properties and flexibility.

When the synthetic resin container 200 is configured as a delamination container, it is preferable to use resins having low compatibility with each other as materials for the inner layer body 130a and the outer layer body 130b.

The RFID 30 (Radio Frequency Identification) is embedded in the trunk portion 133 of the synthetic resin container 200 as an embedded member. As shown in FIG. 1, the RFID 30 is arranged at one position in the circumferential direction slightly above the central height of the trunk portion 133, and is offset radially inward from the central position in the thickness direction of the trunk portion 133. 130a. The RFID 30 is a non-contact type IC tag. The RFID 30 is mounted on a container, and a dedicated communication device is used to write and read various data to and from the RFID 30 to manage merchandise and physical distribution. can be done.

In this embodiment, the RFID 30 includes an IC chip having the functions of a transmission/reception unit, a control unit, and a memory, an antenna for transmitting and receiving radio waves between the information stored in the memory and a dedicated communication device, and the IC chip and a package that seals the For example, the RFID 30 may be configured such that an IC chip is arranged on a laminated ceramic substrate and an antenna is provided in the laminated ceramic substrate, or the laminated ceramic substrate on which the IC chip is arranged is arranged on a circuit substrate having an antenna. It can also be configured to

The ratio of the thickness of the RFID 30 to the thickness of the synthetic resin container 200 at the site where the RFID 30 is embedded is preferably 0.5 or less. Therefore, when the radial thickness of the container of the RFID 30 is 0.8 mm, the radial thickness of the synthetic resin container 200 at the portion where the RFID 30 is embedded is 1 mm in total for the inner layer body 130a and the outer layer body 130b. 0.6 mm or more is preferred.

Next, a method for manufacturing the synthetic resin container 200 according to this embodiment will be described with reference to FIGS. 2 to 4. FIG.

A synthetic resin container 200 according to this embodiment is formed by blow molding a preform 100 shown in FIG.

The preform 100 is configured by fitting the inner body 10 radially inside the outer body 20, as shown in FIG. In this embodiment, the outer body 20 includes a cylindrical trunk outer body 23 and a bottom outer body 24 that continues to the lower end of the trunk outer body 23 and closes the lower end. In addition, a cylindrical shoulder outer body 21 and an enlarged diameter portion 22 connected to the lower part of the shoulder outer body 21 are formed in the upper part of the trunk outer body 23, and the shoulder outer body 21 and the trunk outer body are formed. 23 are connected by this enlarged diameter portion 22 . In this embodiment, the outer body 20 is formed by injection molding.

On the other hand, the inner body 10 includes, as shown in FIG. and a bottom inner body 14 that An annular neck ring 12 projecting radially outward is provided at the lower portion of the mouth portion 11 . The preform 100 can be secured to the mold by abutting the neck ring 12 against the reference surface of the blow mold. A recess 13 a is provided on the outer surface of the trunk inner body 13 , and the RFID 30 is fitted in the recess 13 a and exposed to the outer surface of the inner body 10 .

In the manufacturing method of the synthetic resin container 200 according to this embodiment, first, the inner body 10 is formed by insert molding the RFID 30 . Specifically, the inner body 10 of the preform 100 is insert-molded with the RFID 30 set in the mold as an insert material (step S101 in FIG. 4).

Next, the outer body 20 of the preform 100 is formed by injection molding (step S103). The formation of the inner body 10 in step S101 and the formation of the outer body 20 in step S103 need not be performed in this order, and the outer body 20 may be formed first.

Next, the inner body 10 formed in step S101 is arranged (fitted) inside the outer body 20 formed in step S103 to form the preform 100 (step S105). More specifically, the bottom inner body 14 of the inner body 10 is inserted into the shoulder outer body 21 of the outer body 20 from above, and the upper end of the shoulder outer body 21 contacts the lower surface of the neck ring 12 . Mate until it touches. At this time, the lower surface of the bottom inner body 14 contacts or approaches the upper surface of the bottom outer body 24 . Further, the RFID 30, which is an embedded member, is arranged between the outer body 20 and the inner body 10 in the radial direction. The outer body 20 is formed by insert-molding the outer body 20 in a state in which the inner body 10 equipped with the RFID is set in the mold as an insert material, and the inner body 10 is formed inside the outer body 20. may be performed simultaneously or sequentially.

Next, the preform 100 formed in step S105 is mounted on a blow molding die and subjected to biaxial stretch blow molding to form a synthetic resin container 200 (step S107). The preform 100 is attached to the blow molding die by bringing the neck ring 12 into contact with the reference surface of the blow molding die so that the mouth portion 11 of the preform 100 is exposed to the outside of the die. Note that the preform 100 before blow molding is heated to a stretchable temperature, for example, the heating temperature is about 90.degree.

In the present embodiment, the ratio of the thickness of the preform 100 to the thickness of the synthetic resin container 200 at the portion where the embedded RFID 30 is embedded is set to be greater than 1.0 and 2.5 or less. Blow molding is done. By performing blow molding under such conditions, the amount of stretching of the resin around the RFID 30 is less than a predetermined amount, so that distortion is less likely to occur around the RFID 30 and the buckling strength and drop strength of the synthetic resin container 200 are improved. You can reserve as much as you need.

As described above, the method for manufacturing the synthetic resin container 200 according to the present embodiment comprises the steps of forming the cylindrical preform 100 with a bottom, and blow-molding the preform 100 to form the synthetic resin container 200. The embedded member is embedded in the preform 100 and the synthetic resin container 200, and the thickness of the preform 100 with respect to the thickness of the synthetic resin container 200 at the portion where the embedded member is embedded The thickness ratio was configured to be greater than 1.0 and less than or equal to 2.5. By adopting such a configuration, the distortion around the RFID 30 due to the stretching of the resin is suppressed, so that it is possible to reduce the appearance defect and to easily secure the necessary buckling strength and drop strength of the synthetic resin container 200. can.

Further, in this embodiment, the ratio of the thickness of the synthetic resin container 200 in the thickness direction of the embedded member to the thickness of the synthetic resin container 200 at the portion where the embedded member is embedded is 0.5 or less. configured to By adopting such a configuration, it is possible to secure a predetermined thickness of the resin around the RFID 30 with respect to the thickness of the RFID 30, so that distortion is less likely to occur around the RFID 30 and appearance defects are reduced. The buckling strength and drop strength required for the container 200 can be more easily secured.

Further, in this embodiment, the preform 100 has an outer body 20 and an inner body 10 provided inside the outer body 20, and the embedded member is disposed between the outer body 20 and the inner body 10. configured as follows. By adopting such a configuration, in the preform 100 having a two-piece structure, the embedded member can be securely placed between the outer body 20 and the inner body 10 by relatively simple means. can be embedded within

In addition, in the present embodiment, the step of forming the preform 100 includes insert-molding the inner body 10 using the embedded member as an insert material, forming the outer body 20 , and forming the inner body 10 inside the outer body 20 . and placing the By adopting such a configuration, the embedded member can be placed in the inner body 10 by insert molding, so that the embedded member can be reliably embedded in the synthetic resin container 200 by simpler means.

Moreover, in this embodiment, the embedded member is configured to be the RFID 30 . By adopting such a configuration, product management and physical distribution management of the synthetic resin container 200 can be easily performed.

Further, in this embodiment, the embedded member is configured to be embedded in the trunk portion 133 of the synthetic resin container 200 . By adopting such a configuration, the distance between the RFID 30 and the dedicated communication device can be shortened, so that information can be reliably transmitted and received between the communication device and the RFID 30 .

Although the present disclosure has been described with reference to figures and examples, it should be noted that various variations and modifications will be readily apparent to those skilled in the art based on the present disclosure. Therefore, it should be noted that these variations and modifications are included in the scope of the present invention. For example, the functions included in each component can be rearranged so as not to be logically inconsistent, and multiple components can be combined into one or divided. It should be understood that the scope of the present invention includes these.

For example, in the present embodiment, the ratio of the thickness of the synthetic resin container 200 in the thickness direction of the embedded member to the thickness of the synthetic resin container 200 at the portion where the embedded member is embedded is 0.5 or less. configured, but is not limited to this aspect. The above ratio may exceed 0.5 as long as the appearance defects can be reduced without distortion around the RFID 30 and the necessary buckling strength and drop strength of the synthetic resin container 200 can be secured.

Further, in this embodiment, the preform 100 has an outer body 20 and an inner body 10 provided inside the outer body 20, and the embedded member is disposed between the outer body 20 and the inner body 10. However, it is not limited to this aspect. The embedded member may be completely embedded in one of the outer body 20 and the inner body 10, and may be arranged at a position where it does not come into contact with the other. Also, the preform 100 does not necessarily have to be composed of the outer body 20 and the inner body 10 .

In addition, in the present embodiment, the step of forming the preform 100 includes insert-molding the inner body 10 using the embedded member as an insert material, forming the outer body 20 , and forming the inner body 10 inside the outer body 20 . , but it is not limited to this aspect. Instead of using insert molding to form the inner body 10, for example, the RFID 30 may be fitted into a recess of the inner body 10 formed by injection molding afterward. Alternatively, the outer body 20 may be insert-molded using the inner body 10 in which the RFID 30 is embedded as an insert material. Furthermore, the outer body 20 may be formed by insert molding using the RFID 30 as an insert material.

In this embodiment, the RFID 30 fitted in the recess 13a is exposed on the outer surface of the inner body 10, but the RFID 30 is completely embedded in the inner body 10 and the surface of the inner body 10 may not be exposed to

Further, in this embodiment, the RFID 30 is used as the embedded member, but the present invention is not limited to this aspect. As the embedding member, for example, another member from which at least the identification code can be read, such as a magnetic recording medium or a magnet, may be used.

Further, in the present embodiment, the embedded member is configured to be arranged in the body portion 133 of the synthetic resin container 200, but the present invention is not limited to this aspect. The embedded member may be arranged at the mouth portion 111, the shoulder portion 132, the bottom portion 134, or the like of the synthetic resin container 200. FIG.

Further, in the present embodiment, the synthetic resin container 200 is configured so that the portion from the shoulder portion 132 to the bottom portion 134 other than the mouth portion 111 has a laminated structure composed of the outer layer body 130b and the inner layer body 130a. is not limited. The synthetic resin container 200 may have a layered structure in the mouth portion 111 as well, or may not have a layered structure over the entire container.

Six samples were prepared by changing the ratio of the thickness of the preform 100 to the thickness of the synthetic resin container 200 at the portion where the RFID 30 was embedded. operation of the RFID 30;2. appearance of the container;3. buckling strength of the container;4. Four items, namely, drop strength of the container, were evaluated. The RFID 30 used has heat resistance that does not cause damage by injection molding or blow molding, and has a thickness of 0.8 mm. The synthetic resin container 200 used for this evaluation has a total height of 205 [mm] and an outer diameter of the cylindrical body portion 133 of 66 [mm].

Table 1 shows the evaluation results of the above four items for each sample, and Table 2 shows the judgment criteria for each evaluation item.

The evaluation results of all samples for "RFID operation" and "drop strength" were "O", but for "container appearance", the thickness ratio of the preform 100 to the synthetic resin container 200 was 2.5. For larger samples, the evaluation result was "x". This is because if the thickness ratio is greater than 2.5, the distortion around the RFID 30 due to the stretching of the resin exceeds the allowable range (the distortion is clearly visible), which is considered to be a factor in the poor appearance of the container. be done. Therefore, it can be seen that the ratio of the thickness of the preform 100 to the thickness of the synthetic resin container 200 at the portion where the RFID 30 is embedded should be 2.5 or less. At this time, from Table 1, evaluation items other than "appearance of container" are all "O".

In addition, since the RFID 30 used has a thickness of 0.8 [mm], when the thickness ratio of the preform 100 to the synthetic resin container 200 is 2.5 or less, the thickness of the synthetic resin container 200 The thickness ratio of the RFID 30 is 0.5 or less. Therefore, the ratio of the thickness of the RFID 30 to the thickness of the synthetic resin container 200 is preferably 0.5 or less.

According to the present disclosure, it is possible to provide a method for manufacturing the synthetic resin container 200 by blow molding, which suppresses product defects caused by embedded members. According to the present disclosure, not only the authenticity determination using the RFID 30 as an embedded member, but also the RFID 30 having a temperature sensor is used for temperature control during distribution of the container containing the contents. can.

10 inner body 11 mouth 12 neck ring 13 trunk inner body 13a recess 14 bottom inner body 20 outer body 21 shoulder outer body 22 enlarged diameter part 23 trunk outer body 24 bottom outer body 30 RFID (embedding member)
REFERENCE SIGNS LIST 100 preform 111 mouth 111a male screw 111b outer peripheral wall 112 neck ring 113 body inner layer 113a recess 113b shoulder inner layer 114 bottom inner layer 121 shoulder outer layer 123 body outer layer 124 bottom outer layer 130a inner layer 130b outer layer 132 shoulder 132 Body 134 Bottom 200 Synthetic resin container O Center axis S Storage space

Claims (6)

forming a bottomed tubular preform;
Blow molding the preform to form a synthetic resin container;
An embedding member is embedded in the preform and the synthetic resin container,
A synthetic resin container, wherein a ratio of the thickness of the preform to the thickness of the synthetic resin container at a portion where the embedding member is embedded is greater than 1.0 and less than or equal to 2.5. manufacturing method. 2. The method according to claim 1, wherein a ratio of the thickness of the embedded member in the thickness direction of the synthetic resin container to the thickness of the synthetic resin container at the portion where the embedded member is embedded is 0.5 or less. A method for manufacturing a synthetic resin container. The preform has an outer body and an inner body provided inside the outer body,
3. The method of manufacturing a synthetic resin container according to claim 1, wherein said embedded member is arranged between said outer body and said inner body. Forming the preform comprises:
a step of insert-molding the inner body using the embedded member as an insert material;
forming the outer body;
4. The method of manufacturing a synthetic resin container according to claim 3, further comprising the step of arranging said inner body inside said outer body. The method for manufacturing a synthetic resin container according to any one of claims 1 to 4, wherein the embedded member is an RFID. The method for manufacturing a synthetic resin container according to any one of claims 1 to 5, wherein the embedded member is embedded in the body of the synthetic resin container.

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