WO2023189983A1 - ラベル付き容器及びその製造方法 - Google Patents

ラベル付き容器及びその製造方法 Download PDF

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Publication number
WO2023189983A1
WO2023189983A1 PCT/JP2023/011351 JP2023011351W WO2023189983A1 WO 2023189983 A1 WO2023189983 A1 WO 2023189983A1 JP 2023011351 W JP2023011351 W JP 2023011351W WO 2023189983 A1 WO2023189983 A1 WO 2023189983A1
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WO
WIPO (PCT)
Prior art keywords
preform
dimension
labeled container
mold
label
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2023/011351
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English (en)
French (fr)
Japanese (ja)
Inventor
卓哉 五十嵐
駿介 本田
武 由渕
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yupo Corp
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Yupo Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
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Priority to US18/850,652 priority Critical patent/US20250222643A1/en
Priority to JP2024512242A priority patent/JP7847203B2/ja
Publication of WO2023189983A1 publication Critical patent/WO2023189983A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/24—Lining or labelling
    • B29C49/2408—In-mould lining or labelling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/08—Biaxial stretching during blow-moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/24—Lining or labelling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/78—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
    • B29C63/02—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material
    • B29C63/04—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material by folding, winding, bending or the like
    • B29C63/06—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material by folding, winding, bending or the like around tubular articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/24—Lining or labelling
    • B29C2049/2412—Lining or labelling outside the article
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/24—Lining or labelling
    • B29C2049/2414—Linings or labels, e.g. specific geometry, multi-layered or material

Definitions

  • the present invention relates to a labeled container and a method for manufacturing the same.
  • blow molding As a method for molding hollow resin containers, blow molding is known, in which air is blown into a molten resin within a mold to cause it to expand and thereby mold into the shape of the mold.
  • Blow molding includes direct blow method and stretch blow method.
  • the direct blow method uses a parison of raw material resin, heats and melts the parison above its melting point, and then expands it by applying air pressure.
  • the stretch blow method using a preform made of raw resin the preform is heated to around its softening point and then expanded by applying air pressure.
  • the stretch blow method is used for raw resins such as polyethylene terephthalate.
  • In-mold labels are known as labels for blow-molded resin containers. In-mold labels are attached to the surface of a resin container by the heat of heated and melted raw resin.
  • in-mold labels in which a heat-sensitive adhesive layer containing an ethylene-vinyl acetate copolymer is laminated on a polypropylene film are used for polyethylene containers (see, for example, Patent Document 1).
  • the expansion of the preform within the mold may generate stress that tends to stretch the in-mold label.
  • the printed layer of the in-mold label was stretched and deformed, which sometimes affected the appearance, such as making the printed content unclear and deteriorating the design.
  • An object of the present invention is to provide a method for manufacturing a labeled container in which the appearance of the label does not change much even if the container is relatively large in size.
  • the in-mold label has a tensile strength of 10 kN/m or more in one direction
  • a method for producing a labeled container, wherein the arranging step includes the following step (a) or the following step (b) of adjusting the orientation of the in-mold label.
  • the dimension of the labeled container in the horizontal direction is at least twice the dimension of the preform, and the dimension of the labeled container in the depth direction is 1 time or more and less than 2 times the dimension of the preform.
  • the dimension of the labeled container in the horizontal direction is 1 times or more and less than 2 times the dimension of the preform, and in the depth direction; in the step of substantially matching the one direction of the in-mold label with the vertical direction, when the dimensions of the labeled container are 1 times or more and less than 2 times the dimensions of the preform.
  • the ratio of the size of the body to the size of the neck in the horizontal direction is 2 or more, the ratio of the size of the body to the size of the neck in the depth direction is 1 or more and less than 2, and
  • the ratio of the dimension of the body to the dimension of the neck in the horizontal direction is 1 or more and less than 2, and the ratio of the dimension of the body to the dimension of the neck in the depth direction.
  • the ratio of the dimensions of the in-mold label is 1 or more and less than 2, and the one direction of the in-mold label substantially coincides with the vertical direction.
  • FIG. 2 is a vertical cross-sectional view of a preform expanding within a substantially square mold.
  • FIG. 2 is a vertical cross-sectional view of a preform expanding within a substantially rectangular mold.
  • FIG. 2 is a perspective view showing an ⁇ -type labeled container and a preform used for manufacturing the container.
  • FIG. 2 is a perspective view showing a ⁇ -type labeled container and a preform used for manufacturing the container.
  • FIG. 2 is a perspective view showing a ⁇ -type labeled container and a preform used for manufacturing the container. It is a figure which shows the expansion process of a preform when the start timing of gas blowing is the same as the insertion start of a rod. It is a figure which shows the expansion process of a preform when the start timing of gas blowing is adjusted.
  • (meth)acrylic refers to both acrylic and methacrylic.
  • the method for manufacturing a labeled container of the present invention includes the following steps.
  • (S1) Arranging process of placing the in-mold label on the inner wall surface of the mold
  • (S2) Preparation process of preparing a heated preform having a cavity inside
  • (S3) Placing the heated preform inside the mold
  • (S4) Blow process of blowing gas into the cavity of the preform to inflate the preform to form a labeled container with an in-mold label attached.
  • an in-mold label is inserted into a mold used for molding a container, and placed on the inner wall surface of the mold.
  • the position of the in-mold label may be fixed by bringing the in-mold label into close contact with the inner wall surface by suction, static electricity, or the like.
  • the expanding preform may generate stress that stretches the in-mold label. If a large stress is applied in one direction, the appearance of the label on the labeled container may change significantly, such as the aspect ratio of the label becoming unbalanced and the printed content distorted. Stresses that change the appearance of the label can be caused by dimensional differences between the preform and its molded container.
  • FIG. 1a and 1b are cross-sectional views of the preform 10 expanding in the molds 51 and 52, viewed from the vertical direction z.
  • the preform 10 before expansion is represented by a dotted line.
  • the horizontal direction x, the depth direction y, and the vertical direction z are directions orthogonal to each other.
  • the expanded preform 10 is pressed against the inner wall surface of the mold 51 and molded into the same shape as the internal shape of the mold 51.
  • An in-mold label (hereinafter sometimes simply referred to as a label) 20 is arranged on the inner wall surface of the mold 51.
  • the label 20 comes into contact with the preform 10 pressed against the inner wall surface, the label 20 adheres to the outer surface of the preform 10 due to the heat of the preform 10. Thereafter, the further expanding preform 10 generates stress that tends to stretch the label 20.
  • the arrow in the figure indicates the direction in which stress acts.
  • a container having substantially the same dimensions in the horizontal direction x and the depth direction y and having a square cross section is molded.
  • the preform 10 expands in the horizontal direction There will be more room. Therefore, the stress that is applied to stretch the label 20 in the horizontal direction x is greater than when the mold 51 is used, and the appearance of the label is likely to be distorted.
  • the raw resin parison is sufficiently melted at a high temperature, so the expanded parison is flexible and easily follows the shape of the mold, and the stress applied to the label is relatively small.
  • the raw resin is used as a preform rather than the raw resin melted at high temperature as in the parison.
  • the preform remains in a softened state held at a relatively low temperature.
  • stronger blowing pressure than in the direct blowing method is also required.
  • the stress applied to the label is stronger than in the direct blow method, and the appearance of the label tends to change easily.
  • labeled containers 30 whose label appearance may change are roughly divided into three types: ⁇ , ⁇ , and ⁇ , depending on the size difference from the preform 10.
  • the preform 10 and the labeled container 30 are arranged so that the long side direction of the bottom surface coincides with the horizontal direction x, and the in-mold label 20 is placed on the plane formed by the horizontal direction will be placed in
  • the preform 10 has a cavity inside and is usually a cylindrical molded body with a bottom.
  • the preform 10 includes a neck 11 , a body 12 and a fringe 13 .
  • the labeled container 30 includes a neck 31 , a body 32 , and an in-mold label 20 affixed to the outer surface of the body 32 .
  • the preform 10 is fixed to the mold by the fringe 13 engaging with the periphery of the opening of the mold.
  • the body 12 in the mold below the fringe 13 is expanded and stretched to form the body 32 of the labeled container 30. Since the neck 11 of the preform 10 is not stretched in the blowing step (S4), the dimensions of the neck 31 of the labeled container 30 remain almost the same as the neck 11 of the preform 10.
  • a spiral groove can be provided along the circumferential direction on the outer periphery of the neck parts 11 and 31, and a cap having a similar structure can be fitted therein.
  • the ⁇ type labeled container 30 has a flat cross section, and the dimension Dx in the horizontal direction x is larger than the dimension Dy in the depth direction y.
  • the flat shape is, for example, a case where the ratio of the dimension Dx in the horizontal direction x to the dimension Dy in the depth direction y of the body portion 32 (flatness ratio Dx/Dy) is 1.6 or more.
  • the flatness ratio Dx/Dy can be, for example, 5.0 or less.
  • a preform 10 having substantially the same dimension dx in the horizontal direction x and dimension dy in the depth direction y of the body 12 is used to manufacture the labeled container 30. Therefore, the stretching magnification (Dx/dx) in the horizontal direction x of the labeled container 30 by stretch blow molding is high, and the stretching magnification (Dy/dy) in the depth direction y is low.
  • the dimension Dx in the horizontal direction x and the dimension Dy in the depth direction y of the body 32 are the same as the dimension dx in the horizontal direction x and the dimension Dy in the depth direction of the body 12 of the preform 10.
  • the following relationships are satisfied for each dimension dy of y.
  • the label 20 affixed to a surface parallel to the horizontal direction x tends to be stretched in the horizontal direction x. 2 ⁇ Dx/dx 1 ⁇ Dy/dy ⁇ 2
  • the above tendency tends to occur when the stretching ratios in the horizontal direction x and the depth direction y are different. Specifically, it is expressed by the dimension Dx in the horizontal direction x of the body 32, the dimension Dy in the depth direction y, the dimension dx in the horizontal direction x and the dimension dy in the depth direction y of the body 12 of the preform 10 (Dx ⁇ dy)/(Dy ⁇ dx) is 2.0 or more, 2.5 or more, or 3.0 or more. (Dx ⁇ dy)/(Dy ⁇ dx) can be, for example, 5.0 or less.
  • the above tendency tends to occur when the stretching ratio (Dz/dz) in the vertical direction z is low. Specifically, the stretching ratio is low when the dimension dz of the body 12 of the preform 10 and the dimension Dz of the body 32 of the labeled container 30 in the vertical direction z satisfy the following relationship. . 1 ⁇ Dz/dz ⁇ 1.5
  • the neck portion 11 of the preform 10 hardly changes due to blow molding, and the dimensions of the neck portions 11 and 31 are approximately the same (ndx ⁇ NDx, ndy ⁇ NDy). Therefore, in the ⁇ type, the dimension Dx in the horizontal direction x and the dimension Dy in the depth direction y of the body portion 32 satisfy the following relationship with respect to the dimension NDx in the horizontal direction x and the dimension NDy in the depth direction y of the neck portion 31. I can say that. 2 ⁇ Dx/NDx 1 ⁇ Dy/NDy ⁇ 2
  • the ⁇ type labeled container 30 has a substantially square cross section, and the difference between the dimension Dy in the depth direction y and the dimension Dx in the horizontal direction x is small.
  • the substantially square shape means, for example, that the ratio of the dimension Dx in the horizontal direction x to the dimension Dy in the depth direction y of the body portion 32 (flatness ratio Dx/Dy) is less than 1.6.
  • the flatness ratio Dx/Dy can be, for example, 1.0 or more.
  • a preform 10 having substantially the same dimension dx in the horizontal direction x and dimension dy in the depth direction y of the body 12 is used as in the ⁇ -type. Therefore, the stretching ratio of the labeled container 30 by blow molding in both the horizontal direction x and the depth direction y is relatively low.
  • the dimension Dx in the horizontal direction x and the dimension Dy in the depth direction y of the body 32 are the same as the dimension dx in the horizontal direction x and the dimension Dy in the depth direction of the body 12 of the preform 10.
  • the following relationships are satisfied for each dimension dy of y.
  • a label 20 affixed to a surface parallel to the horizontal direction x tends to be stretched in the vertical direction z. 1 ⁇ Dx/dx ⁇ 2 1 ⁇ Dy/dy ⁇ 2
  • the above tendency tends to occur when the stretching ratios in the horizontal direction x and the depth direction y are close to each other. Specifically, it is expressed by the dimension Dx in the horizontal direction x of the body 32, the dimension Dy in the depth direction y, the dimension dx in the horizontal direction x and the dimension dy in the depth direction y of the body 12 of the preform 10 (Dx ⁇ dy)/(Dy ⁇ dx) is less than 2.0, less than 1.7, or less than 1.4. (Dx ⁇ dy)/(Dy ⁇ dx) can be, for example, 1.0 or more. Similarly, the above tendency tends to occur when the stretching ratio in the vertical direction z is high.
  • the case where the stretching ratio is high is a case where the dimension dz of the body 12 of the preform 10 and the dimension Dz of the body 32 of the labeled container 30 in the vertical direction z satisfy the following relationship. be. 1.5 ⁇ Dz/dz
  • the dimensions of the neck portions 11 and 31 are approximately the same (ndx ⁇ NDx, ndy ⁇ NDy). Therefore, in the ⁇ type, the dimension Dx in the horizontal direction x and the dimension Dy in the depth direction y of the body part 32 satisfy the following relationship with respect to the dimension NDx in the horizontal direction x and the dimension NDy in the depth direction y of the neck part 31. I can say that. 1 ⁇ Dx/NDx ⁇ 2 1 ⁇ Dy/NDy ⁇ 2
  • the ⁇ type labeled container 30 has a flat shape similar to the ⁇ type, but the preform 10 also has a flat shape and is more horizontal than the dimension dy in the depth direction y of the body 12.
  • the dimension dx in the direction x is long.
  • the dimension ndy of the neck portion 11 is longer than the dimension ndx. Therefore, the ⁇ type is common to the ⁇ type in the shape of the labeled container 30, but it is common to the ⁇ type in that the stretching magnification in the horizontal direction x and depth direction y due to blow molding is low.
  • the flat shape is, for example, a case where the ratio of the dimension Dx in the horizontal direction x to the dimension Dy in the depth direction y of the body portion 32 (flatness ratio Dx/Dy) is 1.6 or more.
  • the flatness ratio Dx/Dy can be, for example, 5.0 or less.
  • the dimension Dx in the horizontal direction x and the dimension Dy in the depth direction y of the body 32 of the labeled container 30 are the same as the dimension dx in the horizontal direction x and the dimension dy in the depth direction y of the body 12 of the preform 10. , the following relationships are satisfied.
  • the label 20 attached to a surface parallel to the horizontal direction x tends to be stretched in the vertical direction z, similar to the ⁇ type. 1 ⁇ Dx/dx ⁇ 2 1 ⁇ Dy/dy ⁇ 2
  • the above tendency tends to occur when the stretching ratios in the horizontal direction x and the depth direction y are close to each other. Specifically, it is expressed by the dimension Dx in the horizontal direction x of the body 32, the dimension Dy in the depth direction y, the dimension dx in the horizontal direction x and the dimension dy in the depth direction y of the body 12 of the preform 10 (Dx ⁇ dy)/(Dy ⁇ dx) is less than 2.0, less than 1.8, or less than 1.6. (Dx ⁇ dy)/(Dy ⁇ dx) can be, for example, 1.0 or more.
  • the above tendency tends to occur when the stretching ratio in the vertical direction z is high.
  • the case where the stretching ratio is high is the case where the dimension dz of the body 12 of the preform 10 and the dimension Dz of the body 32 of the labeled container 30 in the vertical direction z satisfy the following relationship. 1.5 ⁇ Dz/dz
  • the dimensions of the neck portions 11 and 31 are approximately the same (ndx ⁇ NDx, ndy ⁇ NDy). Therefore, in the ⁇ type, the dimension Dx in the horizontal direction x and the dimension Dy in the depth direction y of the body portion 32 satisfy the following relationship with respect to the dimension NDx in the horizontal direction x and the dimension NDy in the depth direction y of the neck portion 31. 1 ⁇ Dx/NDx ⁇ 2 1 ⁇ Dy/NDy ⁇ 2
  • an in-mold label having a tensile strength of 10 kN/m or more in one direction is used, and one direction in which the in-mold label has a high tensile strength is made to approximately coincide with the direction in which stress is applied in each ⁇ to ⁇ type. . This makes it difficult for the label to stretch in the direction in which stress is applied, thereby reducing deformation of the label.
  • the in-mold label arrangement step (S1) includes the following step (a) or the following step (b) of adjusting the orientation of the in-mold label.
  • the dimension (Dx) of the labeled container in the horizontal direction (x) is more than twice the dimension (dx) of the preform, and the dimension (Dy) of the labeled container in the depth direction (y) is larger than the preform.
  • the dimension (Dx) of the labeled container is 1 times or more and less than 2 times the dimension (dx) of the preform, and the dimension (Dy) of the labeled container in the depth direction (y) is the dimension (dy) of the preform. If the tensile strength of the in-mold label is 1 times or more and less than 2 times of
  • substantially matching means, for example, that the angle between one direction of the in-mold label and the horizontal direction x or the vertical direction z is in the range of 0 to 5 degrees, in the range of 0 to 10 degrees, It means in the range of 0° or 0 to 30°.
  • step (a) Since the ⁇ type described above satisfies the conditions of step (a), the orientation of the in-mold label is adjusted in step (a). In the ⁇ type, stress acts in the horizontal direction x, but according to step (a), the in-mold label resists this stress and becomes difficult to stretch in the horizontal direction x, reducing changes in the appearance of the label. I can do it.
  • step (b) since the ⁇ and ⁇ types satisfy the conditions of step (b), the orientation of the in-mold label is adjusted in step (b). In the ⁇ and ⁇ types, stress acts in the vertical direction z, but according to step (b), the in-mold label becomes difficult to stretch in the vertical direction z against this stress, which prevents changes in the appearance of the label. can be reduced.
  • a heated preform is prepared by molding a preform from heated and melted raw resin.
  • a preform that has been previously formed and stored at room temperature is heated by a heating device such as a heater.
  • the heated preform is softened and expanded by the pressure of the gas applied to the preform internal cavity in the blowing step (S4).
  • a preform is heated to a temperature around its softening point, which does not exceed the melting point of its raw material resin. From the viewpoint of sufficiently softening, for example, the temperature of the heated preform is preferably 90° C. or higher.
  • the temperature of the heated preform is preferably 95°C or higher, more preferably 100°C or higher, and even more preferably 105°C or higher. If the temperature of the preform is 105° C. or higher, the preform will be soft and stretchable. The stress applied to the label when the preform expands can be reduced, and changes in the appearance of the label can be further reduced. From the viewpoint of stable container moldability, the temperature of the heated preform is preferably 120°C or lower, more preferably 110°C or lower.
  • the heated preform is inserted into the mold.
  • the body of the preform is located inside the mold, and the neck is located outside the mold.
  • blowing step (S4) gas is blown into the cavity of the preform, and the preform expands due to the pressure (hereinafter sometimes referred to as blow pressure).
  • a rod may be used for vertical stretching. When using a rod, the rod is inserted vertically into the cavity of the preform. The bottom of the preform is pushed by the rod and the body of the preform is stretched vertically downward.
  • the blowing pressure in the blowing step is preferably 3.5 MPa or less, more preferably 3.0 MPa or less, even more preferably 2.7 MPa or less, and particularly preferably 2.3 MPa or less.
  • the blowing pressure is usually 0.5 MPa or more, preferably 1.0 MPa or more.
  • the blowing time during which the gas is blown can be set according to molding conditions such as the temperature of the preform and the blowing pressure.
  • the blowing time is preferably 3 seconds or more, more preferably 5 seconds or more from the viewpoint of sufficient expansion, and from the viewpoint of reducing the stress applied to the label. , 10 seconds or less is preferable, and 8 seconds or less is more preferable.
  • the blowing of gas is started in the blowing step (S4). It is preferable to adjust the timing according to the insertion position of the rod. Specifically, the blowing of gas is started after the length of the inserted portion of the rod preferably exceeds 1/2, more preferably 3/4 of the vertical dimension of the labeled container. This also reduces the stress applied to the label in the vertical direction due to expansion of the preform.
  • the rod of the preform 10 is drawn before the contact between the preform 10 and the label 20 in the upper side of the vertical direction z. Stretching by step 55 can proceed. Therefore, stretching of the label 20 due to expansion of the preform 10 is less likely to occur.
  • the preform 10 expands and the label 20 is completely covered. Since the preform contacts the label 20 at once, stress applied from the preform to the label 20 can be reduced.
  • the labeled container of the present invention is manufactured by the above manufacturing method.
  • the labeled container of the present invention includes a neck, a body, and an in-mold label affixed to the outer surface of the body, as illustrated in FIGS. 2 to 4.
  • This in-mold label has a tensile strength of 10 kN/m or more in one direction, and its orientation is adjusted in the above step (a) or step (b).
  • the labeled container of the present invention satisfies the following condition (I) or the following condition (II).
  • the ratio (Dx/NDx) of the trunk dimension (Dx) to the neck dimension (NDx) in the horizontal direction (x) is 2 or more, and the trunk dimension to the neck dimension (NDy) in the depth direction (y).
  • the ratio (Dy/NDy) of the dimensions (Dy) of the parts is 1 or more and less than 2, and the tensile strength of the in-mold label is 10 kN/m or more and one direction substantially coincides with the horizontal direction (x) (II)
  • the ratio (Dx/NDx) of the torso dimension (Dx) to the neck dimension (NDx) in the horizontal direction (x) is 1 or more and less than 2, and the torso to the neck dimension (NDy) in the depth direction (y).
  • the ratio of dimensions (Dy) (Dy/NDy) is 1 or more and less than 2
  • the tensile strength of the in-mold label is 10 kN/m or more and one direction substantially coincides with the vertical direction (z).
  • the in-mold label used in the present invention may have a tensile strength of 10 kN/m or more in at least one direction, and may have a tensile strength of 10 kN/m or more in multiple directions.
  • any one of the plurality of directions may coincide with the horizontal direction x in the step (a) or the vertical direction z in the step (b).
  • one direction with the highest tensile strength among the plurality of directions coincides with the horizontal direction x in the above step (a), or corresponds with the vertical direction z in the step (b). It is preferable to do so.
  • the tensile strength of the in-mold label is preferably 12 kN/m or more, more preferably 15 kN/m or more, and even more preferably 18 kN/m or more. From the viewpoint of obtaining an excellent appearance by following the shrinkage of the container after molding, the tensile strength of the in-mold label is preferably 40 kN/m or less, more preferably 35 kN/m or less, and even more preferably 30 kN/m or less. .
  • the tensile strength of the stretched layer in a direction perpendicular to the above-mentioned one direction may be less than 10 kN/m.
  • the tensile strength in the direction perpendicular to the above one direction may be 8 kN/m or less, or may be 6 kN/m or less.
  • In-mold labels are usually laminates that include a heat-sealing layer on a base layer.
  • a printed layer made of an ink composition may be formed on the surface of the base layer opposite to the heat-sealing layer by printing.
  • the in-mold label can include a coat layer on the base layer from the viewpoint of improving adhesion with ink.
  • the base material layer is not particularly limited as long as it can impart tensile strength to the label.
  • a thermoplastic resin film or pulp paper can be used as the base layer, and a thermoplastic resin film is preferred from the viewpoint of water resistance.
  • the base material layer may be a porous film containing a thermoplastic resin and a filler.
  • the thickness of the base layer is preferably 30 ⁇ m or more, more preferably 50 ⁇ m or more, and even more preferably 70 ⁇ m or more. From the same viewpoint, the thickness of the base material layer is preferably 250 ⁇ m or less, more preferably 150 ⁇ m or less, and even more preferably 120 ⁇ m or less.
  • Thermoplastic resins that can be used for the base layer include polyolefin resins, polyester resins, polyvinyl chloride resins, polyamide resins, polystyrene resins, and polycarbonate resins, and it is possible to use one or more of these resins. can. From the viewpoint of mechanical strength, polyolefin resins or polyester resins are preferred, and polyolefin resins are more preferred.
  • polyolefin resins examples include polypropylene resins and polyethylene resins.
  • polypropylene resin is preferred from the viewpoint of easily obtaining the desired tensile strength at the stretch blow molding temperature, as well as from the viewpoints of moldability and mechanical strength.
  • Fillers that can be used in the base layer include, for example, inorganic particles such as heavy calcium carbonate, light calcium carbonate, calcined clay, silica, talc, or titanium oxide, and organic particles such as polyethylene terephthalate, polyamide, polystyrene, or melamine resin. Can be mentioned.
  • Examples of the film forming method for the base layer include extrusion molding (cast molding) using a T-die, inflation molding using an O-die, or calendar molding using a rolling roll. If necessary, the film may be stretched. By stretching, a large number of fine pores originating from the filler are formed inside the film, resulting in a porous film.
  • Stretching methods include, for example, a longitudinal stretching method using a difference in the peripheral speed of a group of rolls, a lateral stretching method using a tenter oven, a sequential biaxial stretching method that combines these, a rolling method, and a simultaneous biaxial stretching method that uses a combination of a tenter oven and a pantograph. Examples include an axial stretching method and a simultaneous biaxial stretching method using a combination of a tenter oven and a linear motor.
  • the in-mold label is arranged so that the surface on the heat-sealing layer side faces the preform.
  • a thermoplastic resin film can be used as the heat seal layer.
  • a thermoplastic resin having a lower melting point than the thermoplastic resin in the base material layer can be used for the heat seal layer, and the melting point of the thermoplastic resin is 10° C. or more lower than the thermoplastic resin in the base material layer.
  • the temperature is preferably lower than 20°C, more preferably lower than 30°C.
  • Thermoplastic resins suitable for the heat seal layer include high density polyethylene, medium density polyethylene, low density polyethylene, linear low density polyethylene, ethylene-vinyl acetate copolymer, ethylene/(meth)acrylic acid copolymer, Ethylene/(meth)acrylic acid alkyl ester copolymer (alkyl group has 1 to 8 carbon atoms), metal salt of ethylene/(meth)acrylic acid copolymer (for example, selected from Zn, Al, Li, K, Na) Examples include resins such as salts with metals.
  • the heat seal layer is preferably formed by applying a coating liquid.
  • the solvents used in the coating solution include water; water-soluble solvents such as methyl alcohol, ethyl alcohol, isopropyl alcohol, acetone, and methyl ethyl ketone; and water-insoluble solvents such as ethyl acetate, toluene, and xylene. Can be mentioned.
  • the coating liquid is preferably in the form of a solution or dispersion in which the thermoplastic resin is homogeneously dissolved or dispersed in the above-mentioned solvent. From the viewpoint of process control, it is preferable to prepare a coating liquid by mixing an aqueous solution or an aqueous dispersion of each component. From the viewpoint of reducing the drying load, the solid content concentration in the coating liquid is preferably 0.1% by mass or more, and more preferably 0.2% by mass or more. From the viewpoint of obtaining a uniform coated surface, the solid content concentration is preferably 20% by mass or less, more preferably 10% by mass or less.
  • the in-mold label preferably includes a stretched layer stretched in at least one direction, and more preferably includes a biaxially stretched layer.
  • the base material layer having a large thickness ratio is the above-mentioned stretched layer, and the heat seal layer may also be the above-mentioned stretched layer.
  • the stretching ratio of the stretched layer is preferably 3 times or more in one direction, more preferably 4 times or more, even more preferably 5 times or more, particularly preferably 6 times or more.
  • the stretching ratio of the stretched layer may be, for example, 20 times or less from the viewpoint of formability.
  • the stretching ratio of the stretched layer in the direction perpendicular to the above-mentioned one direction is 3 times or more. Furthermore, from the viewpoint of manufacturing and quality stability, the stretching ratio of the stretched layer in the direction perpendicular to the above-mentioned one direction (in particular, the machine direction (MD)) is preferably 10 times or less, and preferably 6 times or less. It may be four times or less.
  • the thickness of the in-mold label is preferably 50 ⁇ m or more, more preferably 60 ⁇ m or more, even more preferably 70 ⁇ m or more, even more preferably 80 ⁇ m or more, and particularly preferably 90 ⁇ m or more.
  • the thickness of the in-mold label is preferably 300 ⁇ m or less, more preferably 250 ⁇ m or less, and even more preferably 150 ⁇ m or less. .
  • the resin material that can be used for the neck and body of the labeled container of the present invention is not particularly limited, and examples thereof include thermoplastic resins such as polyester resins, polyolefin resins, and polystyrene resins.
  • the present invention is particularly applicable when the resin material is a polyester resin.
  • polyester resin examples include polyethylene terephthalate (PET), polybutylene terephthalate, polybutylene succinate, and polylactic acid.
  • polyolefin resin examples include polypropylene resin, polyethylene resin, and the like.
  • Table 1 lists the materials used for the in-mold label.
  • the resin composition was melt-kneaded in an extruder heated to 230°C, extruded into a sheet, and cooled to obtain a non-stretched sheet.
  • This unstretched sheet was heated to 150° C. and stretched 5 times in the machine direction (MD).
  • MD machine direction
  • the film was then cooled to 60°C, heated again to 150°C, and then stretched 8 times in the transverse direction (TD) using a tenter.
  • Annealing treatment was performed at 160° C. and cooling at 60° C. to obtain a sheet of the base layer, which was a white opaque biaxially stretched film.
  • Ethylene-vinyl acetate copolymer manufactured by Toyo Morton Co., Ltd., product name: Adcoat AD1790-15, main component: ethylene-vinyl acetate copolymer (EVA), solid content 15 mass) on one side of the sheet of the base material layer.
  • % was gravure coated to obtain an in-mold label (L1) in which a heat-sealing layer was laminated on a base material layer.
  • the thickness of the base material layer was 105 ⁇ m
  • the thickness of the heat seal layer was 3 ⁇ m.
  • Table 2 shows a list of in-mold labels (L1) to (L7).
  • Example 1 After charging the in-mold label (L1) using an electrostatic charging device, it is fixed to the inner wall surface of the molding die of a stretch blow molding machine (manufactured by Nissei ASB Co., Ltd., equipment name: ASB-70DPH). Then the mold was tightened. As the mold, an ⁇ -type container forming mold was used. The orientation of the in-mold label (L1) was adjusted so that the longitudinal direction (MD) of the in-mold label (L1) coincided with the horizontal direction, assuming that the long side direction of the bottom surface of the mold was the horizontal direction. Further, the base material layer of the in-mold label (L1) was fixed by suction so as to be in contact with the cavity of the mold. Thereafter, the temperature of the mold was controlled using circulating water so that the surface temperature on the cavity side of the mold was 45°C.
  • MD longitudinal direction
  • ASB-70DPH stretch blow molding machine
  • PET polyethylene terephthalate
  • the delay time from the start of stretching by the rod to the start of blowing is 0.2 seconds, and the length of the inserted part of the rod reaches 1/2 of the vertical dimension (Dz) of the mold cavity.
  • Example 2 and 3 Each labeled container of Examples 2 and 3 was obtained in the same manner as in Example 1, except that the in-mold label (L1) was changed to an in-mold label (L2) and the blow pressure was changed as shown in Table 3. Ta.
  • Example 4 Each labeled container of Examples 4 to 9 was obtained in the same manner as in Example 1, except that the in-mold label, blow pressure, or preform temperature was changed as shown in Table 3.
  • Example 10 Using a mold for forming the ⁇ type, align the transverse direction (TD) of the in-mold label with the horizontal direction, and make sure that the length of the inserted part of the rod exceeds 1/2 of the vertical dimension (Dz) of the container.
  • a labeled container of Example 10 was obtained in the same manner as in Example 5, except that blowing was started after the reaction.
  • Example 11 to 13 Each labeled container of Examples 11 to 13 was obtained in the same manner as in Example 10, except that the in-mold label or the length of the inserted portion of the rod at the start of blowing was changed as shown in Table 4.
  • Example 14 Using a mold and preform for forming the ⁇ type, the transverse direction (TD) of the in-mold label is aligned with the horizontal direction, and the delay time from the start of stretching by the rod to the start of blowing is shown in Table 4.
  • a labeled container of Example 14 was obtained in the same manner as Example 1 except for the changes as shown.
  • Example 15 and 16 Labeled containers of Examples 15 and 16 were obtained in the same manner as in Example 14, except that the temperature of the in-mold label or preform was changed as shown in Table 4.
  • Comparative Example 1 Comparative Example 1 was prepared in the same manner as in Example 5, except that the transverse direction (TD) of the in-mold label was made to match the horizontal direction, and the length of the inserted part of the rod at the start of blowing was changed as shown in Table 4. A labeled container was obtained.
  • TD transverse direction
  • Comparative example 2 The in-mold label (L1) was changed to the in-mold label (L7), and the direction of the in-mold label (L7) was adjusted so that the transverse direction (TD) matched the horizontal direction. A labeled container of Comparative Example 2 was obtained.
  • Comparative example 3 A labeled container of Comparative Example 3 was obtained in the same manner as in Example 11, except that the longitudinal direction (MD) of the in-mold label was made to coincide with the horizontal direction.
  • ⁇ Stretching ratio of labeled containers (horizontal direction)>
  • the ratio of the body dimension to the neck dimension in the horizontal direction of the labeled container (Dx/ndx) was determined as the ratio of the labeled container dimension to the preform dimension in the horizontal direction (Dx/dx).
  • This dimension ratio (Dx/dx) also represents the stretching ratio of the body in the horizontal direction.
  • ⁇ Stretching ratio of labeled containers (depth direction)>
  • the ratio of the body dimension to the neck dimension in the depth direction of the labeled container (Dy/ndy) was determined as the ratio of the labeled container dimension to the preform dimension in the depth direction (Dy/dy).
  • This dimension ratio (Dy/dy) also represents the stretching magnification of the body in the depth direction.
  • ⁇ Aspect ratio of labeled container The ratio of the horizontal dimension to the depth dimension (Dx/Dy) of the labeled container was determined as the flatness ratio.
  • the oblateness is 1.
  • the flatness ratio is greater than 1.
  • the horizontal dimension Dx and the depth dimension Dy of the body of the labeled container, the horizontal dimension dx and the depth dimension dy of the body of the preform are calculated by (Dx ⁇ dy)/(Dy ⁇ dx ) was sought.
  • Tables 3 and 4 show measurement results and evaluation results.
  • the orientation of the in-mold label is adjusted in step (a) for ⁇ -type labeled containers, and in step (b) for ⁇ - and ⁇ -type labeled containers.
  • the tensile strength was 10 kN/m or more and one direction was aligned with the horizontal or vertical direction, the distortion of the printed characters was not large, and deformation of the appearance of the label could be reduced.
  • Example 3 is a molding process from in-mold label (L1) to in-mold label (L2) under the molding conditions of Example 2.
  • the tensile strength was slightly lower and the elongation rate of the label was slightly higher.
  • the temperature of the preform is lowered compared to Example 3, and the preform is stretch-blown in a hard and high state, so that the elongation rate of the label is increased by about 4%. Therefore, the evaluation results of wrinkles or printed character distortion after container molding are improved in Example 2 compared to Example 3, and in Example 3 compared to Example 4.
  • Example 8 the molding conditions of Example 4 were changed from the in-mold label (L2) to the in-mold label (L5). Since the in-mold label (L5) has a large amount of resin, it has a high tensile strength, a low elongation rate, and no wrinkles.
  • Example 10 is a ⁇ -type labeled container in which the in-mold label (L1) easily stretches in the vertical direction, and the molding conditions are optimal for the ⁇ -type. Since blowing is performed after the stretching rod is inserted all the way, the elongation rate of the label can be suppressed. In each of the examples, the distortion of the printed characters was not large and the deformation of the appearance of the label could be reduced, so that the distortion was sufficiently within the allowable range as a product.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
PCT/JP2023/011351 2022-03-30 2023-03-23 ラベル付き容器及びその製造方法 Ceased WO2023189983A1 (ja)

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JP2018161858A (ja) * 2017-03-27 2018-10-18 株式会社吉野工業所 容器製造方法
CN211140039U (zh) * 2019-11-26 2020-07-31 山东益源环保科技有限公司 一种带有标签的方形断面监测采样瓶
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JP2000127230A (ja) * 1998-10-22 2000-05-09 Taisei Kako Kk コールドパリソンブロー成形法による扁平形ボトルの製造方法、並びに、コールドパリソンブロー成形用パリソン
WO2010087148A1 (ja) * 2009-01-30 2010-08-05 株式会社ユポ・コーポレーション インモールド成形用ラベル
WO2012085042A1 (en) * 2010-12-23 2012-06-28 Kao Germany Gmbh Container having a labeled textured surface
JP2014005080A (ja) * 2012-05-31 2014-01-16 Yoshino Kogyosho Co Ltd 扁平ボトル
JP2018161858A (ja) * 2017-03-27 2018-10-18 株式会社吉野工業所 容器製造方法
WO2020204178A1 (ja) * 2019-04-03 2020-10-08 日精エー・エス・ビー機械株式会社 樹脂製容器の製造装置及び製造方法
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