WO2016031150A1 - プリフォーム及びボトル - Google Patents

プリフォーム及びボトル Download PDF

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Publication number
WO2016031150A1
WO2016031150A1 PCT/JP2015/003967 JP2015003967W WO2016031150A1 WO 2016031150 A1 WO2016031150 A1 WO 2016031150A1 JP 2015003967 W JP2015003967 W JP 2015003967W WO 2016031150 A1 WO2016031150 A1 WO 2016031150A1
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WO
WIPO (PCT)
Prior art keywords
colored resin
layer
colored
preform
predetermined time
Prior art date
Application number
PCT/JP2015/003967
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English (en)
French (fr)
Inventor
潤一 千葉
広 細越山
Original Assignee
株式会社吉野工業所
潤一 千葉
広 細越山
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.)
Filing date
Publication date
Application filed by 株式会社吉野工業所, 潤一 千葉, 広 細越山 filed Critical 株式会社吉野工業所
Priority to EP15835621.2A priority Critical patent/EP3187325B1/en
Priority to CN201580038248.XA priority patent/CN106536156B/zh
Priority to US15/324,234 priority patent/US20170197351A1/en
Publication of WO2016031150A1 publication Critical patent/WO2016031150A1/ja
Priority to US16/250,226 priority patent/US11472090B2/en

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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
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/06—Injection blow-moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B11/00—Making preforms
    • B29B11/06—Making preforms by moulding the material
    • B29B11/08—Injection moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B11/00—Making preforms
    • B29B11/14—Making preforms characterised by structure or composition
    • 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
    • B29C49/071—Preforms or parisons characterised by their configuration, e.g. geometry, dimensions or physical properties
    • 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
    • B29C49/22—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor using multilayered preforms or parisons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
    • B65D1/02—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
    • B65D1/02—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents
    • B65D1/0207—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by material, e.g. composition, physical features
    • B65D1/0215—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by material, e.g. composition, physical features multilayered
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C2049/023—Combined blow-moulding and manufacture of the preform or the parison using inherent heat of the preform, i.e. 1 step blow moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/22—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor using multilayered preforms or parisons
    • B29C2049/222—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor using multilayered preforms or parisons only parts of the preforms or parisons are layered
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/0715—Preforms or parisons characterised by their configuration the preform having one end closed
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/073—Preforms or parisons characterised by their configuration having variable diameter
    • B29C2949/0733—Preforms or parisons characterised by their configuration having variable diameter at body portion
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/0861—Other specified values, e.g. values or ranges
    • B29C2949/0872—Weight
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/22—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at neck portion
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/28—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at bottom portion
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/30—Preforms or parisons made of several components
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/30—Preforms or parisons made of several components
    • B29C2949/3004—Preforms or parisons made of several components having longitudinally different components within one layer, e.g. tubes with longitudinal stratified layering
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/30—Preforms or parisons made of several components
    • B29C2949/3016—Preforms or parisons made of several components at body portion
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/30—Preforms or parisons made of several components
    • B29C2949/3032—Preforms or parisons made of several components having components being injected
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/30—Preforms or parisons made of several components
    • B29C2949/3032—Preforms or parisons made of several components having components being injected
    • B29C2949/3034—Preforms or parisons made of several components having components being injected having two or more components being injected
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/30—Preforms or parisons made of several components
    • B29C2949/3032—Preforms or parisons made of several components having components being injected
    • B29C2949/3034—Preforms or parisons made of several components having components being injected having two or more components being injected
    • B29C2949/3036—Preforms or parisons made of several components having components being injected having two or more components being injected having three or more components being injected
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/30—Preforms or parisons made of several components
    • B29C2949/3032—Preforms or parisons made of several components having components being injected
    • B29C2949/3034—Preforms or parisons made of several components having components being injected having two or more components being injected
    • B29C2949/3036—Preforms or parisons made of several components having components being injected having two or more components being injected having three or more components being injected
    • B29C2949/3038—Preforms or parisons made of several components having components being injected having two or more components being injected having three or more components being injected having more than three components being injected
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured 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
    • B29C49/0005—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor characterised by the material
    • 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
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    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/10—Polymers of propylene
    • B29K2023/12—PP, i.e. polypropylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • B29K2067/003—PET, i.e. poylethylene terephthalate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
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    • B29L2031/7158—Bottles

Definitions

  • the present invention relates to a preform made of a synthetic resin having a colored layer that forms a gradation region in which the layer thickness gradually decreases, and a bottle obtained by biaxially stretching blow-molding such a preform. To get a good gradation pattern.
  • Patent Document 1 has a problem that the gradation pattern is not emphasized because the base material layer is colorless and transparent. For this reason, it is conceivable to add a colorant to the substrate, but in this case, there is a problem that the intermediate layer is hidden and the gradation pattern cannot be seen.
  • the present invention has been developed in view of the above-described present situation, and an object thereof is to provide a preform and a bottle capable of obtaining a good gradation pattern.
  • the gist configuration of the present invention is as follows. 1. In a preform made of a synthetic resin having a colored layer that forms a gradation region in which the layer thickness gradually decreases, Coloring that forms a gradation region on the outer peripheral side of the base layer made of the first colored resin, which is made of the second colored resin having a color different from that of the first colored resin and whose layer thickness gradually decreases upward. A preform in which a layer is formed and a coating layer made of the first colored resin is formed on an outer peripheral side of the colored layer.
  • the preform is inserted into the cavity of the mold through the gate. It is formed by injecting a colored resin over a first predetermined time and injecting the second colored resin over a second predetermined time, The start time of the first predetermined time is set to be after the start time of the second predetermined time, the end time of the first predetermined time is set to be after the end time of the second predetermined time, and the second By making the injection speed of the colored resin higher than the injection speed of the first colored resin, the first colored resin hits the central portion of the second colored resin located in the cavity of the mold. After penetrating, by flowing while stretching the second colored resin, The preform according to 1, wherein the colored layer is formed on an outer peripheral side of the base material layer, and the coating layer is formed on an outer peripheral side of the colored layer.
  • the gradation pattern is emphasized by forming the colored layer made of the second colored resin having a color different from that of the first colored resin on the outer peripheral side of the base material layer made of the first colored resin.
  • the coating layer made of the first colored resin is covered with a thin coating layer so that the gradation transition of the gradation pattern can be reduced, so that a good gradation pattern is obtained. be able to.
  • a preform and a bottle capable of obtaining a good gradation pattern can be provided.
  • FIG. 1 is a partially sectional side view and a partially enlarged view of a preform according to an embodiment of the present invention. It is explanatory drawing which shows an example of the injection pattern for shape
  • FIG. 2 is a side view of a bottle obtained by biaxial stretching blow molding the preform of FIG. 1. It is a side view which shows the modification of the preform which concerns on one Embodiment of this invention. It is a side view of the bottle obtained by carrying out biaxial stretch blow molding of the preform of FIG.
  • the vertical direction means a direction along the axis of the preform 1
  • the upper direction means a direction from the bottom 2 of the preform 1 toward the mouth 4
  • the lower direction means Mean the opposite direction.
  • the synthetic resin preform 1 has a bottomed cylindrical shape having a bottom portion 2, a body portion 3 and a mouth portion 4, and co-injects two kinds of colored resins. It is molded with.
  • the preform 1 has a base material layer 5 made of a first colored resin R1 (preferably, PET added with a white colorant).
  • the outer peripheral side of the base material layer 5 is made of a second colored resin R2 having a color different from that of the first colored resin R1 (preferably, a PET added with a colorant other than white), and upwards.
  • An outer colored layer 6a that forms a gradation region Gr in which the layer thickness gradually decreases is formed.
  • a coating layer 7 made of the first colored resin R1 is formed on the outer peripheral side of the outer colored layer 6a.
  • an inner colored layer 6b made of the second colored resin R2 is formed on the inner peripheral side of the base material layer 5.
  • the preform 1 has the coating layer 7 (first colored resin R1) / outer colored layer 6a (second colored resin R2) / group from the outer peripheral side toward the inner peripheral side in the gradation region Gr. It has a four-layer structure that is the material layer 5 (first colored resin R1) / inner colored layer 6b (second colored resin R2).
  • the preform 1 according to the present embodiment is for a beverage bottle having a weight of 22 g, and can form bottles such as 266 ml, 542 ml, and 579 ml by biaxial stretch blow molding. is there.
  • the preform 1 having such a configuration can be manufactured in the following manner. That is, the preform 1 uses a two-layer gate nozzle, and from the state where the first colored resin R1 is filled in the gate provided corresponding to the center of the bottom 2 of the preform 1, through the gate, The first colored resin R1 is injected into the cavity of the mold for a first predetermined time, and the second colored resin R2 is injected for a second predetermined time. Specifically, as shown in FIG. 2, the start time T1s of the first predetermined time is set after the start time T2s of the second predetermined time, and the end time T1f of the first predetermined time is set to the second predetermined time. It is after the end time T2f. Further, the injection speed of the second colored resin R2 is made faster than the injection speed of the first colored resin R1.
  • the first predetermined time is, for example, 7 seconds
  • the second predetermined time is, for example, 0.68 seconds
  • the delay time of the start time T1s of the first predetermined time with respect to the start time T2s of the second predetermined time is, for example, 0 .1 second.
  • the injection speed of the second colored resin R2 can be set to 80 mm / s, for example, and the injection speed of the first colored resin R1 can be set to 6 mm / s, for example.
  • the resins R1 and R2 are flowed to obtain the preform 1.
  • Can do That is, as shown in FIG. 3A, the injection of the second colored resin R2 is started from the state where the first colored resin R1 is filled in the gate, and the injection of the first colored resin R1 is started.
  • the second colored resin R2 flows in the mold cavity while extruding the first colored resin R1 filled in the gate. Then, at the time T2f when the injection of the second colored resin R2 is completed, as shown in FIG.
  • the region corresponding to the gradation region Gr on the outer peripheral surface of the cavity is covered with the first colored resin R1.
  • the second colored resin R2 penetrates the central portion of the first colored resin R1.
  • the first colored resin R1 penetrates through the center of the second colored resin R2, flows while stretching the second colored resin R2,
  • the layer configuration of the preform 1 described above can be obtained as shown in FIG.
  • the preform 1 according to the present embodiment described above by performing the biaxial stretch blow molding of the preform 1, a gradation related to the color density appears and is added by the outer colored layer 6a as shown in FIG. A decorated bottle 8 can be obtained.
  • the outer colored layer made of the second colored resin R2 having a color different from that of the first colored resin R1 on the outer peripheral side of the base material layer 5 made of the first colored resin R1.
  • the gradation pattern Gm can be emphasized, and the outer colored layer 6a is formed with the thin coating layer 7 by forming the coating layer 7 made of the first colored resin R1 on the outer peripheral side of the outer colored layer 6a. Since the gradation transition of the gradation pattern Gm is covered, a good gradation pattern Gm can be obtained.
  • the IV value (intrinsic viscosity) of the first colored resin R1 is preferably in the range of 0.5 to 0.63, and more preferably is set to a value of 0.00. 6 to 0.63.
  • the preform 1 and the bottle 8 according to the embodiment described above are for beverages, but as a modification, for example, those for toiletries as shown in FIGS. 5 and 6 may be used.
  • the bottle 8 'according to this modification is obtained by, for example, biaxially stretching blow-molding a preform 1' having a weight of 50 g, and can have a capacity of, for example, 550 ml. Also in this case, a good gradation pattern Gm can be obtained as in the case of the above-described embodiment.
  • first colored resin R1 and the second colored resin R2 may be, for example, PP (polypropylene) instead of PET.
  • the first colored resin R1 and the second colored resin R2 can be colored and transparent depending on the purpose, in addition to being colored opaque.

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Abstract

　本発明に係るプリフォーム（１）は、第１の着色樹脂（Ｒ１）からなる基材層（５）の外周側に、第１の着色樹脂（Ｒ１）とは異なる色の第２の着色樹脂（Ｒ２）からなり、上方に向かって層厚が徐々に減少するグラデーション領域（Ｇｒ）を形成する着色層（６ａ）が形成されると共に、該着色層（６ａ）の外周側に第１の着色樹脂（Ｒ１）からなる被覆層（７）が形成されていることを特徴とするものである。

Description

プリフォーム及びボトル
　本発明は、層厚が徐々に減少するグラデーション領域を形成する着色層を有する合成樹脂製のプリフォーム、及びそのようなプリフォームを２軸延伸ブロー成形することで得られるボトルに関し、特に、良好なグラデーション模様を得ようとするものである。
　従来、飲料、食品、化粧料等の様々な分野で使用されるＰＥＴ（ポリエチレンテレフタレート）等の合成樹脂製ボトルにおいて、着色の濃淡をボトルの上下方向（ボトルの軸心に沿う方向）に変化させ、着色濃度に係るグラデーションを現出させてボトルを加飾する２軸延伸ブロー成形ボトルが知られている（例えば、特許文献１参照）。特許文献１では、３層ノズルを用いた共射出成形により、透明な基材層内に着色樹脂からなる中間層を設け、この中間層によってグラデーション模様を得ている。
特開２００６－３３４８４９号公報
　しかしながら、特許文献１に記載されるような従来のボトルでは、基材層が無色透明であるため、グラデーション模様が強調されないという問題があった。このため、基材に着色剤を添加することが考えられるが、この場合には、中間層が隠れてグラデーション模様が見えなくなってしまうという問題がある。
　本発明は、前記の現状に鑑み開発されたもので、良好なグラデーション模様を得ることができるプリフォーム及びボトルを提供することを目的とする。
　すなわち、本発明の要旨構成は以下のとおりである。
１．層厚が徐々に減少するグラデーション領域を形成する着色層を有する合成樹脂製のプリフォームにおいて、
　第１の着色樹脂からなる基材層の外周側に、第１の着色樹脂とは異なる色の第２の着色樹脂からなり、上方に向かって層厚が徐々に減少するグラデーション領域を形成する着色層が形成されると共に、該着色層の外周側に前記第１の着色樹脂からなる被覆層が形成されていることを特徴とするプリフォーム。
２．前記プリフォームは、前記プリフォームの底部中央に対応して設けられたゲート内に前記第１の着色樹脂が充填された状態から、前記ゲートを介して、金型のキャビティ内に前記第１の着色樹脂を第１の所定時間に亘って射出すると共に、前記第２の着色樹脂を第２の所定時間に亘って射出することで形成されており、
　前記第１の所定時間の開始時点を前記第２の所定時間の開始時点以後とし、前記第１の所定時間の終了時点を前記第２の所定時間の終了時点より後とすると共に、前記第２の着色樹脂の射出速度を前記第１の着色樹脂の射出速度よりも速くすることで、前記第１の着色樹脂が、金型のキャビティ内に位置する前記第２の着色樹脂の中央部を突き貫いた後、前記第２の着色樹脂を引き延ばしつつ流動することにより、
　前記基材層の外周側に前記着色層が形成されると共に、前記着色層の外周側に前記被覆層が形成されている、前記１のプリフォーム。
３．前記第１の着色樹脂のＩＶ値が０．５～０．６３の範囲内である、前記１又は２のプリフォーム。
４．前記１～３のいずれかのプリフォームを２軸延伸ブロー成形することで、前記着色層により着色濃度に係るグラデーションが現出して加飾されたボトル。
　本発明によれば、第１の着色樹脂からなる基材層の外周側に、第１の着色樹脂とは異なる色の第２の着色樹脂からなる着色層を形成したことで、グラデーション模様を強調できると共に、着色層の外周側に第１の着色樹脂からなる被覆層を形成したことで、着色層を薄い被覆層で覆ってグラデーション模様の濃淡の遷移を暈せるため、良好なグラデーション模様を得ることができる。
　したがって、本発明によれば、良好なグラデーション模様を得ることができるプリフォーム及びボトルを提供することができる。
本発明の一実施形態に係るプリフォームの一部断面側面図及びその一部拡大図である。 図１に示すプリフォームを成形するための射出パターンの一例を示す説明図である。 図３に示す射出パターンによる金型キャビティへの溶融樹脂の充填過程を示す説明図である。 図１のプリフォームを２軸延伸ブロー成形して得られたボトルの側面図である。 本発明の一実施形態に係るプリフォームの変形例を示す側面図である。 図５のプリフォームを２軸延伸ブロー成形して得られたボトルの側面図である。
　以下、図１～図４を参照して、本発明の一実施形態に係るプリフォーム１及びボトル８について詳細に例示説明する。
　ここに、本明細書において、上下方向とは、プリフォーム１の軸心に沿う方向を意味し、上方とは、プリフォーム１の底部２から口部４に向かう方向を意味し、下方とは、その反対方向を意味するものとする。
　図１に示すように、本実施形態に係る合成樹脂製のプリフォーム１は、底部２、胴部３及び口部４を有する有底円筒形状をなし、２種類の着色樹脂を共射出することで成形されている。具体的には、プリフォーム１は、第１の着色樹脂Ｒ１（好ましくは、白色の着色剤を添加したＰＥＴ）からなる基材層５を有している。また、基材層５の外周側には、第１の着色樹脂Ｒ１とは異なる色の第２の着色樹脂Ｒ２（好ましくは、白色以外の着色剤を添加したＰＥＴ）からなり、上方に向かって層厚が徐々に減少するグラデーション領域Ｇｒを形成する外側着色層６ａが形成されている。また、外側着色層６ａの外周側には、第１の着色樹脂Ｒ１からなる被覆層７が形成されている。
　さらに、基材層５の内周側には、第２の着色樹脂Ｒ２からなる内側着色層６ｂが形成されている。このように、プリフォーム１は、グラデーション領域Ｇｒにおいて、外周側から内周側に向かって、被覆層７（第１の着色樹脂Ｒ１）／外側着色層６ａ（第２の着色樹脂Ｒ２）／基材層５（第１の着色樹脂Ｒ１）／内側着色層６ｂ（第２の着色樹脂Ｒ２）となる４層構造になっている。なお、本実施形態に係るプリフォーム１は、２２ｇの重量を有する飲料ボトル用のものであり、２軸延伸ブロー成形によって、例えば、２６６ｍｌ、５４２ｍｌ、５７９ｍｌ等のボトルを形成することができるものである。
　かかる構成になるプリフォーム１は、以下の要領にて製造することができる。すなわち、プリフォーム１は、２層ゲートノズルを用い、プリフォーム１の底部２中央に対応して設けられたゲート内に第１の着色樹脂Ｒ１が充填された状態から、前記ゲートを介して、金型のキャビティ内に第１の着色樹脂Ｒ１を第１の所定時間に亘って射出すると共に、第２の着色樹脂Ｒ２を第２の所定時間に亘って射出することで形成されている。具体的には、図２に示すように、第１の所定時間の開始時点Ｔ１ｓを第２の所定時間の開始時点Ｔ２ｓ以後とし、第１の所定時間の終了時点Ｔ１ｆを第２の所定時間の終了時点Ｔ２ｆより後とする。また、第２の着色樹脂Ｒ２の射出速度は、第１の着色樹脂Ｒ１の射出速度よりも速くする。
　ここに、第１の所定時間は例えば７秒、第２の所定時間は例えば０．６８秒、第２の所定時間の開始時点Ｔ２ｓに対する第１の所定時間の開始時点Ｔ１ｓの遅延時間は例えば０．１秒とすることができる。また、第２の着色樹脂Ｒ２の射出速度は例えば８０ｍｍ／ｓ、第１の着色樹脂Ｒ１の射出速度は例えば６ｍｍ／ｓとすることができる。
　このような射出タイミング及び速度で第１の着色樹脂Ｒ１及び第２の着色樹脂Ｒ２を共射出成形することで、図３に示すように、樹脂Ｒ１，Ｒ２を流動させてプリフォーム１を得ることができる。すなわち、図３（ａ）に示すように、ゲート内に第１の着色樹脂Ｒ１が充填された状態から第２の着色樹脂Ｒ２の射出を開始し、第１の着色樹脂Ｒ１の射出を開始する前の時点Ｔａでは、第２の着色樹脂Ｒ２が、ゲート内に充填されていた第１の着色樹脂Ｒ１を押出しつつ金型のキャビティ内を流動する。そして、第２の着色樹脂Ｒ２の射出が終了した時点Ｔ２ｆでは、図３（ｂ）に示すように、キャビティの外周面におけるグラデーション領域Ｇｒに対応する領域が第１の着色樹脂Ｒ１に被覆された状態で、第２の着色樹脂Ｒ２が第１の着色樹脂Ｒ１の中央部を突き貫く。さらに、時点Ｔｂになると、図３（ｃ）に示すように、第１の着色樹脂Ｒ１が第２の着色樹脂Ｒ２の中央部を突き貫き、第２の着色樹脂Ｒ２を引き延ばしつつ流動し、第１の着色樹脂Ｒ１の射出が終了する時点Ｔ１ｆでは、図３（ｄ）に示すように、前述したプリフォーム１の層構成を得ることができる。
　以上説明した本実施形態に係るプリフォーム１によれば、プリフォーム１を２軸延伸ブロー成形することで、図４に示すような、外側着色層６ａにより着色濃度に係るグラデーションが現出して加飾されたボトル８を得ることができる。本実施形態に係るボトル８によれば、第１の着色樹脂Ｒ１からなる基材層５の外周側に、第１の着色樹脂Ｒ１とは異なる色の第２の着色樹脂Ｒ２からなる外側着色層６ａを形成したことで、グラデーション模様Ｇｍを強調できると共に、外側着色層６ａの外周側に第１の着色樹脂Ｒ１からなる被覆層７を形成したことで、外側着色層６ａを薄い被覆層７で覆ってグラデーション模様Ｇｍの濃淡の遷移を暈せるため、良好なグラデーション模様Ｇｍを得ることができる。
　なお、良好なグラデーション模様Ｇｍを得るためには、第１の着色樹脂Ｒ１のＩＶ値（固有粘度）は、０．５～０．６３の範囲内とすることが好ましく、より好ましくは、０．６～０．６３とする。
　以上説明した実施形態に係るプリフォーム１及びボトル８は飲料用のものであったが、変形例として、例えば、図５及び図６に示すような、トイレタリー用のものとすることもできる。本変形例のボトル８’は、例えば重量５０ｇのプリフォーム１’を２軸延伸ブロー成形することで得られるもので、例えば５５０ｍｌの容量を有するものとすることができる。この場合も、前述した実施形態の場合と同様に、良好なグラデーション模様Ｇｍを得ることができる。
　前述したところは、本発明の一実施形態を示したにすぎず、特許請求の範囲において、種々の変更を加えることができる。例えば、第１の着色樹脂Ｒ１及び第２の着色樹脂Ｒ２は、その一方又は双方を、ＰＥＴに代えて例えばＰＰ（ポリプロピレン）としてもよい。また、第１の着色樹脂Ｒ１及び第２の着色樹脂Ｒ２は、着色不透明の他、目的に応じて着色透明とすることもできる。
　１，１’　プリフォーム
　２　底部
　３　胴部
　４　口部
　５　基材層
　６ａ　外側着色層（着色層）
　６ｂ　内側着色層
　７　被覆層
　８，８’　ボトル
　Ｒ１　第１の着色樹脂
　Ｒ２　第２の着色樹脂
　Ｇｒ　グラデーション領域
　Ｔ１ｓ　第１の所定時間の開始時点
　Ｔ２ｓ　第２の所定時間の開始時点
　Ｔ１ｆ　第１の所定時間の終了時点
　Ｔ２ｆ　第２の所定時間の終了時点
　Ｔａ，Ｔｂ　時点
　Ｇｍ　グラデーション模様

Claims (4)

  1. 　層厚が徐々に減少するグラデーション領域を形成する着色層を有する合成樹脂製のプリフォームにおいて、
    　第１の着色樹脂からなる基材層の外周側に、第１の着色樹脂とは異なる色の第２の着色樹脂からなり、上方に向かって層厚が徐々に減少するグラデーション領域を形成する着色層が形成されると共に、該着色層の外周側に前記第１の着色樹脂からなる被覆層が形成されていることを特徴とするプリフォーム。
  2. 　前記プリフォームは、前記プリフォームの底部中央に対応して設けられたゲート内に前記第１の着色樹脂が充填された状態から、前記ゲートを介して、金型のキャビティ内に前記第１の着色樹脂を第１の所定時間に亘って射出すると共に、前記第２の着色樹脂を第２の所定時間に亘って射出することで形成されており、
    　前記第１の所定時間の開始時点を前記第２の所定時間の開始時点以後とし、前記第１の所定時間の終了時点を前記第２の所定時間の終了時点より後とすると共に、前記第２の着色樹脂の射出速度を前記第１の着色樹脂の射出速度よりも速くすることで、前記第１の着色樹脂が、金型のキャビティ内に位置する前記第２の着色樹脂の中央部を突き貫いた後、前記第２の着色樹脂を引き延ばしつつ流動することにより、
    　前記基材層の外周側に前記着色層が形成されると共に、前記着色層の外周側に前記被覆層が形成されている、請求項１に記載のプリフォーム。
  3. 　前記第１の着色樹脂のＩＶ値が０．５～０．６３の範囲内である、請求項１又は２に記載のプリフォーム。
  4. 　請求項１～３のいずれか一項に記載のプリフォームを２軸延伸ブロー成形することで、前記着色層により着色濃度に係るグラデーションが現出して加飾されたボトル。
PCT/JP2015/003967 2014-08-28 2015-08-06 プリフォーム及びボトル WO2016031150A1 (ja)

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US15/324,234 US20170197351A1 (en) 2014-08-28 2015-08-06 Preform and bottle
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US15/324,234 A-371-Of-International US20170197351A1 (en) 2014-08-28 2015-08-06 Preform and bottle
US16/250,226 Continuation US11472090B2 (en) 2014-08-28 2019-01-17 Preform and bottle

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US10994886B2 (en) 2017-10-12 2021-05-04 The Procter And Gamble Company Blow molded article with visual effects
US11046473B2 (en) 2018-07-17 2021-06-29 The Procter And Gamble Company Blow molded article with visual effects
CN113661037A (zh) * 2019-04-11 2021-11-16 宝洁公司 具有视觉效果的吹塑制品
US11724847B2 (en) 2018-10-19 2023-08-15 The Procter & Gamble Company Blow molded article with debossing
US11975522B2 (en) 2020-01-08 2024-05-07 The Procter & Gamble Company Blow molded multilayer article with color gradient

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Publication number Priority date Publication date Assignee Title
US10994886B2 (en) 2017-10-12 2021-05-04 The Procter And Gamble Company Blow molded article with visual effects
US11046473B2 (en) 2018-07-17 2021-06-29 The Procter And Gamble Company Blow molded article with visual effects
US11814208B2 (en) 2018-07-17 2023-11-14 The Procter & Gamble Company Blow molded article with visual effects
US11724847B2 (en) 2018-10-19 2023-08-15 The Procter & Gamble Company Blow molded article with debossing
CN113661037A (zh) * 2019-04-11 2021-11-16 宝洁公司 具有视觉效果的吹塑制品
US11667069B2 (en) 2019-04-11 2023-06-06 The Procter & Gamble Company Blow molded article with visual effects
CN113661037B (zh) * 2019-04-11 2023-10-13 宝洁公司 具有视觉效果的吹塑制品
US11975522B2 (en) 2020-01-08 2024-05-07 The Procter & Gamble Company Blow molded multilayer article with color gradient

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EP3187325A4 (en) 2018-02-21
US20170197351A1 (en) 2017-07-13
US11472090B2 (en) 2022-10-18
EP3187325B1 (en) 2020-04-29
JP2016049638A (ja) 2016-04-11
US20190143576A1 (en) 2019-05-16
JP6415902B2 (ja) 2018-10-31
CN106536156A (zh) 2017-03-22
CN106536156B (zh) 2020-01-14
EP3187325A1 (en) 2017-07-05

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