WO2014155759A1 - Préforme et récipient en résine - Google Patents

Préforme et récipient en résine Download PDF

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Publication number
WO2014155759A1
WO2014155759A1 PCT/JP2013/067205 JP2013067205W WO2014155759A1 WO 2014155759 A1 WO2014155759 A1 WO 2014155759A1 JP 2013067205 W JP2013067205 W JP 2013067205W WO 2014155759 A1 WO2014155759 A1 WO 2014155759A1
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WO
WIPO (PCT)
Prior art keywords
preform
thickness
mouth
preform body
central portion
Prior art date
Application number
PCT/JP2013/067205
Other languages
English (en)
Japanese (ja)
Inventor
伸生 川村
宏哉 岩堀
Original Assignee
日本山村硝子株式会社
味の素株式会社
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 日本山村硝子株式会社, 味の素株式会社 filed Critical 日本山村硝子株式会社
Priority to CN201380075114.6A priority Critical patent/CN105073383A/zh
Publication of WO2014155759A1 publication Critical patent/WO2014155759A1/fr

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    • 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
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/48—Moulds
    • B29C2049/4879—Moulds characterised by mould configurations
    • B29C2049/4892—Mould halves consisting of an independent main and bottom part
    • 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
    • B29C2949/0715—Preforms or parisons characterised by their configuration the preform having one end closed
    • 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
    • B29C2949/072—Preforms or parisons characterised by their configuration having variable wall thickness
    • 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
    • B29C2949/073—Preforms or parisons characterised by their configuration having variable diameter
    • 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
    • B29C2949/074—Preforms or parisons characterised by their configuration having ribs or protrusions
    • 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
    • B29C2949/076—Preforms or parisons characterised by their configuration characterised by the shape
    • B29C2949/0761—Preforms or parisons characterised by their configuration characterised by the shape characterised by overall the shape
    • 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
    • B29C2949/076—Preforms or parisons characterised by their configuration characterised by the shape
    • B29C2949/0768—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform
    • B29C2949/0769—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform characterised by the lip, i.e. very top of preform neck
    • 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
    • B29C2949/076—Preforms or parisons characterised by their configuration characterised by the shape
    • B29C2949/0768—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform
    • B29C2949/078—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform characterised by the bottom
    • 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
    • B29C2949/081—Specified dimensions, e.g. values or ranges
    • B29C2949/0811—Wall thickness
    • B29C2949/0813—Wall thickness of the neck
    • 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
    • B29C2949/081—Specified dimensions, e.g. values or ranges
    • B29C2949/0811—Wall thickness
    • B29C2949/0817—Wall thickness of the body
    • 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
    • B29C2949/081—Specified dimensions, e.g. values or ranges
    • B29C2949/0811—Wall thickness
    • B29C2949/0818—Wall thickness of the bottom
    • 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
    • B29C2949/081—Specified dimensions, e.g. values or ranges
    • B29C2949/082—Diameter
    • B29C2949/0822—Diameter of the neck
    • 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
    • B29C2949/081—Specified dimensions, e.g. values or ranges
    • B29C2949/082—Diameter
    • B29C2949/0826—Diameter of the body
    • 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
    • B29C2949/081—Specified dimensions, e.g. values or ranges
    • B29C2949/082—Diameter
    • B29C2949/0827—Diameter of the bottom
    • 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
    • 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
    • B29C49/08—Biaxial stretching during blow-moulding
    • B29C49/087—Means for providing controlled or limited stretch ratio
    • 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
    • B29C49/10—Biaxial stretching during blow-moulding using mechanical means for prestretching
    • B29C49/12—Stretching rods
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7158—Bottles

Definitions

  • the present invention relates to a preform molded into a resin container by a blow molding method, and the resin container.
  • an infusion container having two mouths on the upper and lower sides of a flexible main body is known.
  • Such an infusion container is generally formed by direct blow.
  • the stretch blow molding method has become widespread as an improvement in production speed over this molding method.
  • the stretch blow molding method is adopted, the production speed is relatively fast and, in addition, the thickness can be easily controlled, so that there is an advantage that there is little variation in quality.
  • Patent Document 1 describes a preform that prevents the eccentricity of the central axis during heating by determining the ratio of the minimum thickness of the shoulder equivalent portion to the thickness of the trunk equivalent portion.
  • the container body in an infusion container, it is necessary to deform the container body as uniformly as possible to discharge the infusion well, and a container having a more uniform thickness is required.
  • the preform of Patent Document 1 during blow molding, the preform body excluding the mouth is biaxially stretched in the longitudinal direction and the short direction, but depending on the molding conditions, the preform body is stretched due to the difference in the site along the longitudinal direction. The degree will change. When the degree of stretching differs in the longitudinal direction, there is a problem that the wall thickness varies depending on the part of the container body, and the high required performance cannot be satisfied.
  • an object of the present invention is to provide a preform capable of obtaining a resin container having a barrel portion having a very uniform thickness, and a resin container molded thereby.
  • the preform of the present invention is an axially long cylindrical preform body that is biaxially stretched by a blow molding method to form a container body of a resin container, and has a thickness of a substantially central portion in the axial direction t1.
  • the following relational expression is satisfied when the thicknesses at both end portions in the axial direction are t2 and t3, respectively, and the thickness between the end portions from the center portion gradually decreases toward the end portions.
  • the reform body 1.5 ⁇ (t1 / t2) ⁇ 2.5 1.2 ⁇ (t1 / t3) ⁇ 3.0
  • two mouths formed on both sides in the longitudinal direction of the preform body 1.5 ⁇ (t1 / t2) ⁇ 2.5 1.2 ⁇ (t1 / t3)
  • the thickness of the substantially central portion in the axial direction of the preform body is t1
  • the thickness of both axial end portions of the preform body is t2 and t3
  • the above relational expression is satisfied
  • the preform body is biaxially stretched as the thickness between the end portions from the central portion gradually decreases toward the end portions, the degree of stretching changes due to the difference in position along the longitudinal direction. Can be prevented. Therefore, a resin container having a very uniform wall thickness can be obtained.
  • the preform body has a neck portion directly below the one mouth portion, and the thickness t1 of the substantially central portion in the axial direction and the thickness t2 of one end portion in the axial direction on the neck side further have the following relationship. If the equation is satisfied, the thickness of the shoulder connected to the neck of the resin container can be made thin and uniform. 1.5 ⁇ (t1 / t2)
  • the weight of the shoulder portion and the trunk portion can be reduced, and the shoulder portion and The thickness of the trunk can be made more uniform.
  • a resin container obtained by biaxially stretching a preform by a blow molding method wherein the preform is each of the preforms described above, and a longitudinal stretching ratio of the preform body is 1.7 to 2.1.
  • the long side lateral draw ratio is 3.3 to 3.9
  • the short side lateral draw ratio is 2.1 to 2.8.
  • the molecular orientation of the resin is appropriately adjusted, and a high-strength resin container can be obtained.
  • the preform main body when the preform main body is biaxially stretched, it is possible to prevent a change in the degree of stretching due to a difference in site along the longitudinal direction. Obtainable.
  • (A) is a schematic cross-sectional view of the molding machine for shape
  • (b) is the schematic longitudinal cross-sectional view. It is a figure of the state which loaded the preform to the blow molding die. It is a figure of the state which extending
  • (A) is the front view of the shape
  • (b) is the top view. It is sectional drawing of the preform which concerns on 2nd Embodiment of this invention. It is sectional drawing of the preform which concerns on 3rd Embodiment of this invention. It is sectional drawing of the preform which concerns on 4th Embodiment of this invention.
  • FIG. 1 is a sectional view of a preform 1 according to the first embodiment of the present invention.
  • a preform 1 shown in FIG. 1 is made of polypropylene molded by an injection molding machine (not shown), and is biaxially stretched by a blow molding method to be molded into an infusion container (resin container).
  • the preform 1 is formed in a cylindrical preform body 2 that is long in the axial direction, a cylindrical first mouth 3 formed on the upper side of the preform body 2, and a lower side of the preform body 2.
  • the neck portion 5 is formed immediately below the first mouth portion 3 in the preform main body 2.
  • the first mouth portion 3 has the same inner diameter as the preform main body 2, and the first mouth portion 3 includes an upper collar portion 6 positioned at the upper end of the preform 1, and the upper collar portion 6.
  • a middle collar portion 7 is formed on the lower side with a predetermined interval.
  • the second mouth portion 4 is formed so as to be reduced in diameter from the preform body 2.
  • a lower collar portion 8 located at the lower end and a thin film portion 9 that closes the second mouth portion 4 are formed.
  • the 2nd opening part may penetrate without providing such a thin film part in a 2nd opening part.
  • the preform body 2 is elongated with the same inner diameter from an axial upper end portion 10 (hereinafter referred to as an upper end portion) through an axial central portion 11 (hereinafter referred to as a central portion) to an axial lower end portion 12 (hereinafter referred to as a lower end portion).
  • the thickness is gradually decreased from the central portion 11 toward the upper end portion 10 and gradually decreased from the central portion 11 toward the lower end portion 12.
  • the axial dimension h1 of the preform body 2 of the present embodiment is 44 mm, and the axial dimension h2 of the neck 5 is 8 mm.
  • the axial dimension h3 from the axial center of the preform body 2 to the lower end of the neck 5 is 21 mm, and the axial dimension h4 from the axial center of the preform body 2 to the lower end is 15 mm.
  • the thickness central diameter (diameter) n1 of the central portion 11 of the preform body 2 is 18.7 mm, and the thickness t1 of the central portion 11 is 3.4 mm.
  • the wall thickness t2 of the upper end portion 10 of the preform body 2 which is also the lower end of the neck portion 5 is 1.74 mm
  • the wall thickness t3 of the lower end portion 12 of the preform body 2 is 1.49 mm.
  • the peripheral surface 2 a excluding the neck portion 5 of the preform body 2 is curved so as to bulge outward from the central portion 11 to the upper end portion 10, and curved so as to bulge outward from the central portion 11 to the lower end portion 12. ing.
  • part can be changed suitably.
  • the thickness t1 of the central portion 11 of the preform body 2, the thickness t2 of the upper end portion 10 of the preform body 2, and the thickness t3 of the lower end portion 12 of the preform body 2 satisfy the following relational expression. . 1.5 ⁇ (t1 / t2) ⁇ 2.5 1.2 ⁇ (t1 / t3) ⁇ 3.0
  • the wall thickness t1 of the center portion 11 of the preform body 2 and the wall thicknesses t2 and t3 of the both end portions 10 and 12 of the preform body 2 satisfy the above relational expression, and the both end portions 10 and 12 from the center portion 11 are satisfied. Since the thickness between them gradually decreases toward the respective end portions 10 and 12, when the preform main body 2 is biaxially stretched, a change in the stretching degree due to the difference in the portion along the longitudinal direction is caused. Can be prevented.
  • FIG. 2 (a) is a schematic transverse sectional view of a molding machine 15 for molding an infusion container using the preform 1
  • FIG. 2 (b) is a schematic longitudinal sectional view thereof.
  • a molding machine 15 shown in FIG. 2 has an apparatus configuration for performing a blow molding method, and includes a blow molding die 16, a stretch rod device 17 positioned above the blow molding die 16, A blow air device 18 for supplying air 50 and a control unit 19 for controlling the stretch rod device 17 and the blow air device 18 are mainly configured.
  • the blow molding die 16 is composed of a split die 20 and a bottom die 21.
  • the body mold 20 includes a first insertion portion 22 into which the first mouth portion 3 of the preform 1 is inserted, and a main body portion 23, and a cylindrical cavity 24 that is horizontally long and extends in the vertical direction. Is formed.
  • the bottom mold 21 is a mold in which the second mouth portion 4 of the molded body molded from the preform 1 is inserted and the vicinity of the second mouth portion 4 is molded.
  • An upper receiving mold 26 is used.
  • a second insertion portion 27 for inserting the second mouth portion 4 is formed at the center of the bottom die 21, and the receiving die 26 has an annular shape in which the root portion of the second mouth portion 4 is molded.
  • the mouth mold 28 is formed.
  • a water channel 29 for flowing cooling water is formed inside the bottom mold 21.
  • the water channel 29 includes an annular channel 30 that circulates around the second insertion part 27 and a convex path 31 that is brought close to the bottom of the tip of the second insertion part 27.
  • the bottom mold 21 is cooled, and the second insertion part 27 and the mouth mold 28 are kept at a lower temperature than the body mold 20. Yes.
  • the temperature of the mouth mold 28 is preferably 10 ° C. to 20 ° C.
  • the temperature of the cooling water in this case is adjusted to around 15 ° C., for example, although it depends on the size and shape of the bottom mold 21.
  • the temperature of the body mold 20 in which the body of the molded body is molded is adjusted to 80 ° C. to 130 ° C. in order to maintain an appropriate cooling rate of the molded body.
  • the temperature of the mouth mold 28 is adjusted to 10 ° C. to 20 ° C.
  • the temperature of the body mold 20 is adjusted to 80 ° C. to 130 ° C.
  • the mold 28 is kept at a lower temperature than the body mold 20. That is, the root portion of the second mouth portion 4 of the molded body molded by the mouth mold 28 is cooled at a lower temperature than the body portion of the molded body.
  • the inner diameter r1 of the second insertion portion 27 into which the second mouth portion 4 is inserted is in a range of 0.5 mm to 3.0 mm in dimensional difference with respect to the maximum outer diameter r2 of the second mouth portion 4. It only has to be. If the inner diameter r1 of the second insertion part 27 has such a dimensional difference with respect to the maximum outer diameter r2 of the second mouth part 4, the second mouth part 4 becomes the second insertion part 27. When moving downward and proceeding downward, the second insertion portion 27 restricts the movement that tends to deviate from the axial center, and can be within the range of the dimensional difference. If the movement to deviate from the axis of the second mouth 4 can be restricted, the second mouth 4 can be prevented from being eccentric.
  • the stretch rod device 17 includes a columnar stretch rod 32, a blow nozzle 33 that supports the stretch rod 32 so that it can be driven up and down, and a drive unit 34 that drives the stretch rod 32 up and down.
  • the stretch rod device 17 is fixed by a fixing member (not shown) so that the axis of the stretch rod 32 coincides with the axis of the cavity 24 of the blow molding die 16.
  • the stretch rod 32 that is controlled and driven in the vertical direction protrudes downward from the blow nozzle 33 by a predetermined amount at a predetermined speed and enters the cavity 24 of the blow molding die 16.
  • the diameter r3 of the stretch rod 32 is larger than the inner diameter r4 of the second mouth portion 4.
  • FIG. 3 is a view showing a state in which the preform 1 is loaded into the blow molding die 16
  • FIG. 4 is a view showing a state in which the preform 1 has been stretched.
  • the molding method of the present embodiment includes a loading step for loading the preform 1 into the blow molding die 16, a stretching step for biaxially stretching the preform 1, and holding for cooling the molded body in the blow molding die 16. Process.
  • the preform 1 is loaded so that the second mouth 4 is positioned in the blow mold 16 as shown in FIG. To do.
  • the middle flange portion 7 of the first mouth portion 3 of the preform 1 is hooked on the upper side of the first insertion portion 22 so that the axis of the preform 1 and the axis of the cavity 24 coincide with each other. Secure to.
  • the stretch rod 32 is driven to enter the inside of the preform 1 through the first mouth 3.
  • the stretch rod 32 is lowered until its tip abuts against the preform body 2.
  • the second mouth portion 4 is air sealed from the inside so as to be closed.
  • the blow air 50 is blown and the stretch rod 32 is further driven downward, and the preform body 2 is biaxially stretched by longitudinal stretching with the stretch rod 32 and lateral stretching with the blow air 50.
  • the drive unit 34 and the blow air device 18 of the stretch rod device 17 are controlled by the control unit 19 so that the air sealing state of the second mouth portion 4 can be maintained by these operations.
  • the control unit 19 drives the stretch rod 32 downward and the blow air 50 so that the longitudinal stretching by the stretch rod 32 precedes the transverse stretching by the blow air 50 than usual. Control blowing pressure.
  • the preform temperature is set to 123 ° C. by heating the blow molding die 16, and the stretch speed of the stretch rod 32 is set to 1 m / s.
  • the pre-blow pressure by the blow air device 18 was sequentially controlled by the control unit 19 so as to maintain the air seal state at this stretch speed. While the longitudinal stretching by the stretch rod 32 precedes the lateral stretching by the blow air 50, the biaxial stretching by these is inserted into the second insertion portion 27 of the bottom mold 21 by the second mouth 4 as shown in FIG. Proceed until fitted.
  • the shapes of the first mouth portion 3 and the second mouth portion 4 of the preform 1 are almost unchanged, and only the preform body 2 is biaxially stretched and gradually becomes thinner.
  • the preform body 2 is biaxially stretched to the shape of the cavity 24 to form a molded body 35.
  • the second mouth portion 4 is in a state of being fitted into the second insertion portion 27 of the bottom mold 21.
  • the root portion 35 a of the second mouth portion 4 of the molded body 35 is molded by the mouth die 28 of the receiving die 26.
  • the biaxially stretched molded body 35 is held in contact with the blow molding die 16 for cooling for a predetermined time.
  • the temperature of the mouth mold 28 is adjusted to 10 ° C. to 20 ° C. by the water channel 29 and the temperature of the body mold 20 is adjusted to 80 ° C. to 130 ° C., so that the temperature of the mouth mold 28 is kept lower. I'm leaning.
  • mold 28 is cooled earlier than the trunk
  • the inner diameter r1 of the second insertion part 27 into which the second mouth part 4 is inserted has a dimensional difference of 0.5 mm to 3.0 mm with respect to the maximum outer diameter r2 of the second mouth part 4. Therefore, the second insertion portion 27 restricts the movement of the second mouth portion 4 that tends to deviate from the axis.
  • the root portion 35a of the second mouth portion 4 is cooled at a lower temperature, and the movement of the second mouth portion 4 to be displaced from the axis of the second mouth portion 4 is restricted. The effect of preventing eccentricity is enhanced.
  • FIG. 5 (a) is a front view of the molded infusion container 40
  • FIG. 5 (b) is a plan view thereof.
  • the infusion container 40 includes a container body 41 obtained by biaxially stretching the preform body 2 and first and second mouth portions 3 and 4 that are formed in the container body 41 and face each other.
  • the dimensions of the first and second mouth portions 3 and 4 are the same as those of the preform 1, the trunk diameter (long side) d 1 is 68 mm, the trunk diameter (short side) d 2 is 42 mm, and the neck 5
  • the dimension h5 from the lower end to the root of the second mouth 4 is 100 mm.
  • the preform body 2 has a longitudinal stretching ratio of 1.7 to 2.1, a long side lateral stretching ratio of 3.3 to 3.9, and a short side lateral stretching ratio of 2.1 to 2. 8 is preferable. If the longitudinal stretching ratio and the lateral stretching ratio are within such ranges, the molecular orientation during biaxial stretching of the preform body 2 is appropriately adjusted, and the high mechanical strength of the infusion container 40 that is the molded body 35 is high. Can be obtained.
  • the thickness t1 of the central portion 11 of the preform body 2 and the thicknesses t2 and t3 of both end portions 10 and 12 of the preform body 2 satisfy a predetermined relational expression,
  • the wall thickness between the end portions 10 and 12 gradually decreases from the central portion 11 toward the end portions 10 and 12. It is possible to prevent a change in the degree of stretching due to the difference in the parts. Therefore, the infusion container 40 having the container body 41 with a very uniform wall thickness can be obtained.
  • the infusion container 40 of the present embodiment has a container body 41 in a biaxially stretched state, which is formed by causing the longitudinal stretching by the stretch rod 32 to precede the transverse stretching by the blow air 50 than usual. Since the said container main body 41 shape
  • FIG. 6 is a cross-sectional view of the preform 43 according to the second embodiment of the present invention.
  • the main difference between this embodiment and the above embodiment is that the thickness of the upper end portion 45 of the preform body 44 is thinner.
  • the preform body 44 is formed to be long with the same inner diameter from the upper end portion 45 to the lower end portion 47 through the central portion 46, and the thickness between the central portion 46 and both end portions 45, 47 varies from the central portion 46 to the upper end portion. While gradually decreasing toward 45, the distance gradually decreases from the central portion 46 toward the lower end portion 47.
  • the thickness t3 of the portion 47 is the same as in the above embodiment.
  • the peripheral surface 44 a of the preform main body 44 is curved so as to bulge outward from the central portion 46 to the upper end portion 45 and is curved so as to bulge outward from the central portion 46 to the lower end portion 47.
  • the thickness t1 of the central portion 46 of the preform body 44 of the present embodiment is 3.68 mm
  • the thickness t2 of the upper end portion 45 is 1.41 mm.
  • the thickness t1 of the central portion 46 of the preform body 44, the thickness t2 of the upper end portion 45, and the thickness t3 of the lower end portion 47 are 1.5 ⁇ (t1 / t2). ⁇ 2.5, 1.2 ⁇ (t1 / t3) ⁇ 3.0 is satisfied.
  • the thickness t1 of the central portion 46 and the thicknesses t2 and t3 of the both end portions 45 and 47 satisfy the above relational expression, and the thickness between the central portion 46 and the both end portions 45 and 47 is the end portions 45 and 47.
  • the neck portion 48 of the present embodiment has a stepped shape between a neck upper portion 48a and a neck lower portion 48b having a smaller thickness.
  • the axial dimension h6 of the neck upper part 48a is 5 mm
  • the wall thickness t4 is 2.23 mm
  • the axial dimension h7 of the neck lower part 48b is 6.0 mm
  • the wall thickness t5 is 1.41 mm.
  • the neck part 48 is made into a step shape, and the preform main body 44 is connected to the neck part lower part 48b with a small thickness.
  • the thickness t2 of the upper end portion 45 of the preform main body 44 connected to the neck lower portion 48b is the same as the thickness t5 of the neck lower portion 48b.
  • the thickness t2 of the upper end portion 45 of the preform main body 44 connected to the neck lower portion 48b and the thickness t1 of the central portion 46 further satisfy the relational expression of 1.5 ⁇ (t1 / t2) in addition to the above relational expression. Satisfies. With the above configuration, the thickness of the shoulder connected to the neck 48 in the molded body can be made thin and uniform.
  • FIG. 7 is a cross-sectional view of a preform 53 according to the third embodiment of the present invention.
  • This embodiment is different from the first embodiment in that an outer surface 54a between the upper end portion 55 and the central portion 56 of the preform main body 54 is curved inward. Except for this point, the configuration is substantially the same as in the first embodiment, and the outer surface 54b between the lower end portion 57 and the central portion 56 of the preform body 54 is curved outward as in the first embodiment. Yes.
  • the outer surface 54a between the upper end portion 55 and the central portion 56 inward the weight of the shoulder portion and the trunk portion of the resin container can be reduced, and the thickness of the shoulder portion and the trunk portion can be reduced. Can be made more uniform.
  • the outer surface between the upper end portion and the central portion of the preform main body may be curved inward.
  • FIG. 8 is a cross-sectional view of a preform 60 according to the fourth embodiment of the present invention.
  • the main difference between this embodiment and the first embodiment is that the axial dimension of the preform body 61 is shortened.
  • the axial dimension h8 of the preform body 61 of this embodiment is 44 mm.
  • the center diameter 62 of the central portion 62 of the preform body 61 is 19.4 mm, the thickness t1 of the central portion 62 is 3.38 mm, and the thickness t2 of the upper end portion 63 is 1.83 mm.
  • the thickness t3 of the lower end portion 64 is 1.74 mm.
  • the peripheral surface 61a of the preform body 61 is curved so as to bulge outward from the central portion 62 to the upper end portion 63, and bulges outward from the central portion 62 to the lower end portion 64. Is so curved.
  • the thickness t1 of the central portion 62 of the preform body 2, the thickness t2 of the upper end portion 63, and the thickness t3 of the lower end portion 64 are 1.5 ⁇ (t1 / t2) as in the first embodiment. ) ⁇ 2.5, 1.2 ⁇ (t1 / t3) ⁇ 3.0.
  • the preform of each embodiment is an example of the present invention and is not restrictive.
  • the resin container of the present invention is not limited to an infusion container, and may be a container used for other uses such as beverages, chemicals, and industrial use.
  • any container may be used as long as it has two mouth portions facing each other.
  • the bottom portion that closes the second mouth portion is provided, but the second mouth portion may pass through without providing the bottom portion.
  • the resin used for the resin container is appropriately changed, and in addition to polypropylene, a known flexible material such as polyethylene, polyester, nylon, vinyl chloride, chlorinated polyethylene, ethylene-vinyl acetate copolymer, etc. Things can be used.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Manufacturing & Machinery (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)

Abstract

L'invention porte sur une préforme (1) ayant un corps principal de préforme (2) qui a une forme cylindrique s'étendant dans la direction axiale, et deux parties d'embout (3, 4) formées sur les deux côtés longitudinaux du corps principal de préforme (2), le corps principal de préforme (2) étant étiré de façon biaxiale et moulé en un récipient de transport de liquide (40) par moulage par soufflage. Lorsque l'épaisseur de paroi de la partie sensiblement centrale (11), dans la direction axiale, du corps principal de préforme (2) est représentée par t1 et que les épaisseurs de paroi des deux parties d'extrémité axiale (10, 12) du corps principal de préforme (2) sont représentées respectivement par t2 et t3, les relations 1,5 < (t1/t2) < 2,5 et 1,2 < (t1/t3) < 3,0 sont satisfaites, et l'épaisseur de paroi entre la partie centrale (11) et les deux parties d'extrémité (10, 12) diminue progressivement vers la partie d'extrémité (10, 12). On obtient ainsi un récipient de transport de liquide (40) ayant une épaisseur de paroi extrêmement uniforme.
PCT/JP2013/067205 2013-03-27 2013-06-24 Préforme et récipient en résine WO2014155759A1 (fr)

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JP2013066764A JP6137900B2 (ja) 2013-03-27 2013-03-27 プリフォーム及び樹脂製容器の成形方法
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Cited By (2)

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JP2014188854A (ja) * 2013-03-27 2014-10-06 Nihon Yamamura Glass Co Ltd 樹脂製容器の成形方法
EP3213901A4 (fr) * 2014-10-30 2018-05-23 Discma AG Préforme pour moulage par soufflage de liquide

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JP6235393B2 (ja) * 2014-03-27 2017-11-22 日本山村硝子株式会社 樹脂製容器の成形方法及びプリフォーム
JP6553453B2 (ja) * 2014-10-30 2019-07-31 株式会社吉野工業所 液体ブロー成形方法
WO2016067512A1 (fr) * 2014-10-30 2016-05-06 株式会社吉野工業所 Préforme pour moulage par soufflage de liquide
WO2016067511A1 (fr) * 2014-10-30 2016-05-06 株式会社吉野工業所 Préforme pour moulage par soufflage d'un liquide
JP7158338B2 (ja) * 2019-05-31 2022-10-21 サントリーホールディングス株式会社 プリフォームおよび容器成形方法

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JPS57142850A (en) * 1981-02-24 1982-09-03 Terumo Corp Flat vessel which can be crushed and its manufacture
JPH09276369A (ja) * 1996-04-11 1997-10-28 Material Eng Tech Lab Inc 輸液容器及びその製造方法
JP2000052412A (ja) * 1998-08-12 2000-02-22 Naigai Kasei Kk 偏平容器の製造方法
JP2009517295A (ja) * 2005-11-25 2009-04-30 サックミ コーペラティバ マッカニキ イモラ ソシエタ コーペラティバ 容器及び容器を得るためのプリフォーム
JP2012245642A (ja) * 2011-05-25 2012-12-13 Nihon Yamamura Glass Co Ltd 樹脂製容器の成形方法及び樹脂製容器

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014188854A (ja) * 2013-03-27 2014-10-06 Nihon Yamamura Glass Co Ltd 樹脂製容器の成形方法
EP3213901A4 (fr) * 2014-10-30 2018-05-23 Discma AG Préforme pour moulage par soufflage de liquide

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CN105073383A (zh) 2015-11-18
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