WO2016152456A1 - Préforme, matrice de moulage de préforme, et procédé de fabrication d'un récipient en résine synthétique - Google Patents

Préforme, matrice de moulage de préforme, et procédé de fabrication d'un récipient en résine synthétique Download PDF

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Publication number
WO2016152456A1
WO2016152456A1 PCT/JP2016/056749 JP2016056749W WO2016152456A1 WO 2016152456 A1 WO2016152456 A1 WO 2016152456A1 JP 2016056749 W JP2016056749 W JP 2016056749W WO 2016152456 A1 WO2016152456 A1 WO 2016152456A1
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WIPO (PCT)
Prior art keywords
preform
central axis
mold
center
spherical
Prior art date
Application number
PCT/JP2016/056749
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English (en)
Japanese (ja)
Inventor
伴成 田嶋
玲太 石井
Original Assignee
東洋製罐株式会社
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
Priority claimed from JP2015087731A external-priority patent/JP6032320B2/ja
Application filed by 東洋製罐株式会社 filed Critical 東洋製罐株式会社
Priority to CN201680018191.1A priority Critical patent/CN107405819B/zh
Publication of WO2016152456A1 publication Critical patent/WO2016152456A1/fr

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Classifications

    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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

Definitions

  • the present invention relates to a preform capable of reducing the weight of the bottom of a synthetic resin container formed by biaxial stretch blow molding, such as a PET bottle, a preform molding die for molding the preform, and this
  • the present invention relates to a method for manufacturing a synthetic resin container in which a preform is blow-molded while being stretched by a stretching rod, and particularly relates to a shape of a preform bottom that enables these.
  • Synthetic resin containers such as plastic bottles made by molding a synthetic resin such as polyethylene terephthalate into a bottle shape by biaxial stretch blow molding or the like have become widespread and penetrated as beverage containers containing various beverage products. Many of these synthetic resin containers are set in a blow mold in a state where the preform of the bottomed cylindrical preform formed by injection molding or compression molding is heated and softened, The film is blow-molded into a predetermined container shape by stretching in the transverse direction with high-pressure blow air while stretching in the longitudinal direction using a stretching rod.
  • Patent Document 1 shown below discloses a technique for blow-molding a preform.
  • the inner surface and the outer surface of the bottom portion of the preform are spherical portions having a circular cross-sectional shape.
  • a preform whose inner surface and outer surface of the bottom portion are spherical portions is likely to be a thick-walled container with the center of the bottom portion and its vicinity unnecessary by biaxial stretch blow molding. Therefore, in the preform disclosed in Patent Document 2 below, the bottom outer surface is a spherical portion, while the inner surface has a curved surface extending from the preform body portion to the tip center of the bottom portion in a longitudinal section.
  • the tip of the stretch rod comes into contact with the bottom of the preform before the high pressure blow air supply, and longitudinal stretching is started.
  • the preform of Patent Document 2 if the inner surface is formed of a curved surface and a spherical surface portion and the thickness of the bottom center of the preform and the vicinity thereof are reduced, it is difficult to ensure a sufficient thickness at the stretch rod contact portion. If the thickness of the stretch rod contact part is not sufficiently secured, the temperature at the bottom of the preform is set higher when heating the preform in order to adjust the thickness of the synthetic resin container to be biaxially stretch blow molded and to improve heat resistance.
  • the present invention has been made in view of such circumstances, and is excellent in injection moldability and compression moldability even when the thickness of the center of the bottom of the preform and the vicinity thereof is reduced. It is an object of the present invention to provide a preform having a good bottom stretch moldability, a molding die for the preform, and a method for producing a synthetic resin container.
  • a preform of the present invention is a preform having a mouth and neck having an opening, a cylindrical trunk that is continuous with the mouth and neck, and a bottom that closes the trunk.
  • the bottom wall thickness of the preform is formed so as to gradually decrease from the body side toward the bottom center part, and the inner surface of the bottom part is on the center axis on a longitudinal section including the center axis of the preform. It has an elliptic arc shape having a long axis.
  • a preform mold of the present invention is a preform mold including a male mold and a female mold, and when the male mold and the female mold are closed, The gap formed between the male tip and the bottom surface of the female die is formed so as to gradually narrow toward the center of the bottom, and the male tip that forms the bottom inner surface of the preform is the male die.
  • An elliptical arc shape having a long axis on the longitudinal axis on a longitudinal section including the central axis.
  • the method for producing a preform synthetic resin container according to the present invention is a method for producing a synthetic resin container in which a preform is biaxially stretch blow-molded by a stretching rod.
  • the mouth and neck having an opening, a cylindrical trunk continuous to the mouth and neck, and a bottom for closing the trunk, and the thickness of the bottom is from the trunk toward the center of the bottom.
  • the inner surface of the bottom portion has an elliptical arc shape having a long axis on the central axis on the longitudinal section including the central axis of the preform, and the stretching rod is thicker than the central portion of the preform bottom portion.
  • the preform of the present invention has an elliptical arc shape in which the inner surface of the bottom portion has a long axis on the longitudinal axis on the longitudinal section including the central axis of the preform, so the portion near the center of the bottom portion is thinned, and the trunk portion of the bottom portion Since the thickness can be increased continuously and continuously toward the position where the stretch rod is to be stretched, a sufficient thickness is ensured at the bottom portion where the stretch rod abuts when stretching with the stretch rod. It is possible to blow-mold a synthetic resin container having good moldability and a lightweight bottom.
  • the preform molding die of the present invention has an elliptical arc shape in which the male tip that forms the inner surface of the bottom of the preform has an elliptical arc shape having a long axis on the central axis on the longitudinal section including the male central axis. Because of the molding die that can reduce the thickness of the part near the center of the bottom and continuously increase the thickness toward the part near the body of the bottom, it is close to the body of the bottom where the stretching rod abuts when stretching with the stretching rod. A sufficient thickness can be secured at the location, the preform can be stretch-molded with a stretch rod, and a preform that can be blow-molded with a synthetic resin container having a lighter bottom can be molded.
  • the inner surface of the preform bottom has an elliptical arc shape having a long axis on the central axis on the longitudinal section including the central axis of the preform.
  • the part can be made thin and continuously thickened toward the bottom part near the body part, and the stretch rod first contacts the outside of the thick bottom part center from the preform bottom part. Therefore, it is possible to produce a synthetic resin container having improved preform moldability with a stretch rod and having a light weight bottom by blow molding.
  • A is a longitudinal sectional view of the preform of the present invention
  • B is an enlarged longitudinal sectional view of the bottom of the preform.
  • A is a longitudinal sectional view of the preform bottom according to the first embodiment of the present invention
  • B is a longitudinal sectional view of the preform bottom according to the second embodiment
  • C is a longitudinal sectional view of the preform bottom according to the third embodiment.
  • FIG. A is a longitudinally cut end view of a preform molding die in a closed mold state
  • B is a longitudinally cut end view of a mold opened state.
  • A is a longitudinal sectional view immediately before a preform is stretched by a stretch rod in a blow molding die
  • B is a longitudinal section in a state where the preform is stretched by a high pressure blow air while being stretched by a stretch rod.
  • FIG. It is a longitudinal cross-sectional view which shows the contact relationship of the bottom part of a preform, and the front-end
  • A is a diagram for explaining the thickness distribution at the bottom of the preform
  • and B is a partially enlarged diagram thereof. It is a bottom part longitudinal section of the preform concerning a 4th embodiment of the present invention.
  • FIG. 1 shows a preform according to the present invention.
  • the preform 1 has a shape before a synthetic resin container such as a PET bottle is biaxially stretch blow-molded.
  • the body part 3 and the bottom part 4 are provided.
  • the mouth-and-neck portion 2 is formed into a container and then filled with a beverage or the like, an opening 6 serving as a spout, a male screw portion 7 into which a female screw of a cap is screwed, and a lower portion of the male screw portion 7.
  • An annular neck ring 8 to be arranged is formed.
  • the trunk portion 3 is provided below the neck ring 8 and has a cylindrical shape.
  • the thickness of the body portion 3 is made substantially constant except for the upper end side of the body portion 3.
  • a connecting part is provided in which the longitudinal cross-sectional shape of the preform 1 changes from a straight line to a curved line. Changes to the bottom 4 of.
  • the connection portion includes an inner connection portion 10b located on the inner surface side of the trunk portion 3 and the bottom portion 4, and an outer connection portion 10a located on the outer surface side.
  • the shape of the bottom portion 4 of the preform 1 is formed by a hemispherical portion 4a having an outer surface with a radius of curvature R.
  • the inner surface is a surface (spheroid ellipsoid) of an ellipse (long ellipsoid, oblate ellipsoid) which is an ellipse having a major axis on the central axis L of the preform 1 and whose major axis is the rotation axis.
  • the half-spherical spherical surface portion 4b half cut by a plane perpendicular to the long axis is formed by the whole or a part thereof.
  • the semi-long spherical surface portion 4b On the longitudinal section including the central axis L, the semi-long spherical surface portion 4b has an elliptical arc shape that is a part of an ellipse having a long axis on the central axis L as shown in FIG. 1B.
  • the bottom 4 of the preform 1 includes a hemispherical surface portion 4a having the same radius and a hemispherical surface portion 4b having the same major axis and minor axis, or a portion thereof.
  • changing the position of the center C 2 of the center C 1 and Hancho spherical portion 4b of 4a is a three embodiments.
  • the thickness t 1 of the barrel 3 of the preform 1, the normal line of the wall thickness measurement point on the outer surface 3a of the body portion 3, from the outer surface 3a to the inner surface 3b Is the length of Thickness t 2 of the bottom portion 4 of the preform 1
  • the normal line N of thickness measuring points on the outer surface of the bottom 4 (hemisphere surface 4a) Is the length of A of FIG.
  • the thickness t 2 of the bottom 4 is the outer connecting portion 10a, and, towards the bottom center O side through which the central axis L from the height position of the inner connection portion 10b, gradually decreases.
  • the center C 2 of the semimajor spherical portion 4b is located at the top, at a position lower than the inner connection portion 10b outer connecting portion 10a is there.
  • the bottom portion center O side from the height position of the external connection portion 10a is the bottom portion 4.
  • the inner surface of the bottom portion 4 is a hemispherical portion 4b that is a portion of an oblong surface on the bottom portion center O side when the hemispherical portion 4b is cut by a plane that passes through the center C1 of the hemispherical portion 4a and is perpendicular to the central axis L.
  • the thickness of the bottom portion 4 gradually decreases, but the change of the gradual decrease is smaller than that of the first embodiment shown in FIG. 2A, and the bottom portion 4 tends to be thick.
  • C of Figure 2 from the center C 1 of the hemisphere face 4a a third embodiment in which the center C 2 of the semimajor spherical portion 4b is located below, at a position higher than the inner connection portion 10b outer connecting portion 10a is there.
  • the third embodiment uses the bottom center O side from the height position of the outer connection portion 10a as the bottom portion 4.
  • the thickness of the bottom portion 4 gradually decreases, but the change in the gradual decrease becomes larger than in the first embodiment shown in FIG. 2A, and the bottom portion 4 can be made thinner.
  • the present invention can be implemented in any case.
  • the present invention can be connected by one continuous curved surface from the inner connecting portion 10b to the bottom center O side and from the outer connecting portion 10a to the bottom center O side. Therefore, a curved surface having a smoother curvature change than a shape in which an inner surface or an outer surface is formed by a plurality of circular arc surfaces having different radii of curvature can be obtained.
  • FIG. 3 shows an injection mold for the preform 1.
  • the molding die 11 is composed of a male die 12 and a female die 13 composed of a female die body 18 and a split die 14, and usually a molding hole 19 having a shape in which the preform 1 is laid sideways is formed. Has been.
  • the male mold 12 can be moved left and right by a mold opening / closing means (not shown), a base 15 is provided on the left, and a substantially cylindrical core body 16 extending rightward from the center of the right of the base 15 is provided. ing.
  • the outer surface of the core body 16 forms the mouth top surface and the inner surface of the preform 1.
  • a core inclined part 17 is formed between the core neck part 16a and the core body part 16b in which the core body 16 forms the inner surface of the mouth neck part 2 (see FIG. 1A) of the preform 1, and the core inclined part 17 is formed.
  • the core body portion 16b is formed with substantially the same diameter up to the boundary with the preform bottom at the tip.
  • the tip 16c of the core body 16 has an ellipse having a major axis on the central axis of the core body 16, and the surface of a long sphere, which is a spheroid having the major axis as a rotation axis, is half-cut with a plane perpendicular to the major axis. It is formed by the whole semi-long spherical surface part or its part.
  • the front end portion 16 c of the core body 16 is a portion that forms the bottom inner surface of the preform 1.
  • the tip 16c of the core body 16 has an elliptical arc shape that is a part of an ellipse having a long axis on the central axis as shown in FIG. 3B on a longitudinal section including the central axis of the core.
  • the split mold 14 On the right side of the base portion 15 of the male mold 12, a split mold 14 that forms part of the outer surface of the mouth neck 2 and the trunk 3 of the preform 1 is disposed.
  • the split mold 14 includes a pair of split molds, each of which is a semicircular ring that is substantially symmetrical with respect to the core body 16, and is configured to be movable left and right and up and down (see FIGS. 3A and B).
  • a through hole is formed in the center of the split mold 14, and when the base 15 of the male mold 12 and the split mold 14 are combined and integrated, the mouth and neck of the preform 1 A part of the molding hole 19 that forms part of the part 2 and the body part 3, and the body part inner surface 3 b and the bottom part inner surface 4 b of the preform 1 are formed.
  • the female mold body 18 has a recess 21 that opens to the left.
  • the recess 21 is formed with a hole having substantially the same diameter except for the bottom, and forms most of the outer surface 3a of the body portion of the preform 1.
  • the bottom surface 22 of the recess 21 is formed as a hemispherical surface and forms the bottom outer surface of the preform 1.
  • An injection hole with a hole diameter of ⁇ 1 to ⁇ 4 mm is connected to an injection molding machine (not shown) for kneading, melting, and injecting synthetic resin to supply the molten resin to the molding hole 19 at the center of the bottom surface 22 of the female mold body 18.
  • a (gate) 23 is formed.
  • the synthetic resin constituting the preform 1 (container) any thermoplastic resin can be used.
  • polyethylene terephthalate is used.
  • the tip end portion 16c of the core body 16 that forms the bottom inner surface of the preform 1 has a hemispherical shape in which the long axis is on the central axis of the core body 16, and the female main body 18 Since the bottom surface 22 has a hemispherical shape, a preform 1 having a hemispherical surface portion 4a at the bottom outer surface and a semi-long spherical surface portion 4b at the bottom inner surface is formed by injection molding. At the time of injection molding, the molten resin is injected from the bottom of the female mold body 18 through an injection hole 23 from an injection molding machine (not shown).
  • the molten resin spreads radially from the injection hole 23 along the curved surface at the bottom of the cavity, and extends from the position corresponding to the bottom 4 of the preform 1 to the entire molding hole 19 from the body 3 on the tip side to the neck 2. Filled.
  • the tip 16c of the core body 16 has a long spherical shape with the long axis on the central axis of the core main body 16 at the bottom of the molding hole 19, when the molten resin passes through the long spherical surface, A gap gradually increases from the injection hole 23 to the body part, and the resistance of the molten resin can be reduced to pass through the body part on the front side from the bottom part.
  • the preform 1 in the process of further lowering the stretching rod 31 and stretching the blow-molded portion (body portion 3 and bottom portion 4) of the preform 1, fluid such as pressurized air in the preform 1 Is introduced.
  • the preform 1 is stretch blow molded to form a synthetic resin container having a shape corresponding to the molding hole 32.
  • the bottom portion 4 of the preform 1 has an outer surface side semispherical surface portion 4 a having a radius R and an inner surface side semispherical surface portion 4 b is an ellipse from which the rotating body is based.
  • the short radius of the short axis divided by the center of the ellipse is a, and the long radius of the long axis divided by the center of the ellipse is b.
  • the two-dot chain line shown in FIG. 5 is an arcuate surface 4c having the same length as a which is 1 ⁇ 2 of the short diameter of the inner surface side semi-long spherical surface portion 4b, and the thickness of the bottom end is matched. .
  • What is described inside the preform 1 is a stretch rod 31 used for blow molding.
  • the inner surface of the hemispherical surface portion 4b indicated by a solid line is more than the hemispherical surface portion 4c indicated by a two-dot chain line.
  • all the bottoms except the bottom center are thicker. Therefore, when the stretching rod 31 comes into contact with the bottom 4 of the preform 1, the thickness of the contact portion between the stretching rod 31 and the hemispherical surface portion 4b is larger than the thickness of the contact portion between the stretching rod 31 and the hemispherical surface portion 4c. The thickness is thicker in all parts except the center of the bottom.
  • FIG. 6A is an enlarged view of the vertical axis of FIG. 6A, showing the thickness from the bottom of the trunk 3 (position 60 mm below the neck ring) to the bottom 4.
  • What is indicated by a two-dot chain line is the thickness up to the center of the bottom when the inner surface of the bottom is the hemispherical portion 4c. What is indicated by a broken line is almost the same as in the case of the hemispherical part 4c from the lower neck to the body part 3, and the thickness of the bottom part 4 to the center of the bottom part when the bottom inner surface is the hemispherical part 4c ′.
  • the solid line shows the thickness up to the center of the bottom in the case of the semi-long spherical surface portion 4b.
  • the thickness of the preform 1 gradually increases from the bottom of the neck to 10 mm, and then maintains a constant thickness, and the outer peripheral surface is formed from the curved bottom 4 from about 70 mm below the neck. It has become.
  • the bottom portion 4 of the preform 1 when the inner surface is the hemispherical portion 4c and when the inner surface is the hemispherical portion 4c ′, the bottom thickness gradually decreases in proportion to the neck distance. It is getting thinner.
  • Equation 1 Is a preferred range of the thickness t at the center of the bottom of the preform 1 that is excellent in biaxial stretch blow moldability and injection moldability.
  • Equation 4 (R + 19 ⁇ a) / 20 ⁇ b ⁇ (7 ⁇ R + 13 ⁇ a) / 20 (Equation 4)
  • the moldability of the preform 1 It is preferable in terms of fluidity of the molten resin) and blow moldability (stretch moldability by the stretch rod 31).
  • the bottom of the preform 1 and the synthetic resin container in which the preform 1 is biaxially stretched blow-molded can be suitably thinned.
  • the amount of resin used is reduced, and the resin material cost and the transportation cost associated with weight reduction can be saved.
  • the portion where the stretching rod 31 contacts the bottom 4 of the preform 1 can be made thicker than when the bottom inner surface and the outer surface are formed of spherical surfaces. No. 31 becomes difficult to overstretch the bottom 4 of the preform 1, and the preform 1 is excellent in biaxial stretch blow moldability.
  • this embodiment can form the entire bottom inner surface with a single continuous curved surface, rather than the conventional inner surface of a combination of circular arcs having two different radii of curvature, and can achieve injection moldability and biaxial stretch blow moldability. An excellent preform 1 is obtained.
  • the outer surface of the bottom portion of the preform 1 is the hemispherical surface portion 4a and the inner surface of the bottom portion is the hemispherical spherical surface portion 4b.
  • the inner surface of the bottom portion is the same as that of the first embodiment as shown in FIG.
  • the outer surface of the bottom is an ellipse having a long axis on the central axis L of the preform 1 and the surface of a long sphere that is a spheroid rolling body with the long axis as the rotation axis.
  • the semi-ellipsoidal spherical portion 4d has an elliptic arc shape that is a part of an ellipse having a long axis on the central axis L as shown in FIG.
  • the outer semispherical spherical surface portion 4d and the inner half semispherical spherical surface portion 4b may have the centers C1 and C2 aligned with each other, and within a range in which the thickness of the bottom portion 4 is maintained to gradually decrease toward the bottom center O. Alternatively, they may be shifted up and down.
  • the thickness of the bottom 4 is from the normal semi-spherical portion 4d of the outer semispherical spherical portion 4d to the bottom inner surface (semi-spherical portion 4d). The length up to the long spherical surface portion 4b).
  • the bottom surface 22 of the recess 21 of the female mold body 18 of the first embodiment is replaced with a hemispherical portion, and a long axis is formed on the central axis of the recess 21.
  • the surface of an ellipse which is a spheroid having a major axis as a rotation axis, is formed by a semi-ellipsoidal spherical portion obtained by semi-cutting a surface perpendicular to the major axis.
  • the outer surface of the distal end of the core body 16 of the male mold 12 is formed by a semi-ellipsoidal spherical portion as in the first embodiment.
  • the effect of the fourth embodiment is the same as that of the first to third embodiments.
  • the preform has a cylindrical shape
  • the bottom is a semi-spherical surface on the inner surface
  • the outer surface is a semi-spherical surface or a semi-spherical surface.
  • the inner surface of the preform is an elliptical arc shape having a longitudinal axis on the longitudinal section including the preform central axis and having a major axis on the central axis, even if at least one of the inner circumference and the outer circumference of the horizontal section is a flat shape such as an ellipse Good.
  • a flat shape such as an ellipse
  • the outer surface of the bottom portion is a hemispherical surface portion or a semi-spherical spherical surface portion, but may be an oblong spherical surface portion or a spherical surface portion that is slightly smaller than the hemispherical surface or the hemispherical surface in order to connect with the body portion. . Moreover, you may provide a step part and a taper part between a trunk
  • the injection molding mold is described as the preform molding mold. However, it may be a compression molding mold or an injection compression molding mold.
  • the injection hole is closed, and the center of the bottom and the outer surface in the vicinity thereof are curved surfaces having a longitudinal section of an arc or an elliptical arc.
  • the compression molding mold and injection compression molding mold also have good fluidity of the molten resin at the bottom of the preform, similar to the injection molding mold.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Ceramic Engineering (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Abstract

L'invention a trait à une préforme qui présente, même lorsque l'épaisseur de paroi du centre du fond de la préforme et de ses environs est amenée à se réduire, une aptitude au moulage par injection et une aptitude au moulage par compression excellentes, ainsi qu'une aptitude au moulage par étirage favorable du fond à l'aide d'une tige d'étirage pendant le moulage par soufflage avec étirage. Dans la préforme (1), qui comprend une section col (2) munie d'une ouverture (6), une section corps cylindrique (3) qui est reliée à ladite section col (2), et un fond (4) qui ferme ladite section corps (3), l'épaisseur de paroi du fond (4) de ladite préforme (1) est conçue de manière à se réduire progressivement depuis cette section corps (3) jusqu'au centre du fond (4). Dans une section transversale longitudinale qui inclut l'axe central de la préforme, la surface intérieure du fond possède une forme d'arc elliptique (4b) dont le grand axe est sur ledit axe central.
PCT/JP2016/056749 2015-03-25 2016-03-04 Préforme, matrice de moulage de préforme, et procédé de fabrication d'un récipient en résine synthétique WO2016152456A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201680018191.1A CN107405819B (zh) 2015-03-25 2016-03-04 预制品、预制品成型模具以及合成树脂制容器的制造方法

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Application Number Priority Date Filing Date Title
JP2015062642 2015-03-25
JP2015-062642 2015-03-25
JP2015087731A JP6032320B2 (ja) 2015-03-25 2015-04-22 プリフォーム、及び、プリフォーム成形金型、並びに、合成樹脂製容器の製造方法
JP2015-087731 2015-04-22

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WO2016152456A1 true WO2016152456A1 (fr) 2016-09-29

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03286808A (ja) * 1990-04-02 1991-12-17 Yoshino Kogyosho Co Ltd 中間成形品と２軸延伸ブロー成形壜体
JPH0948061A (ja) * 1995-08-09 1997-02-18 Kureha Plast Kk 透明な底部を有するポリプロピレン２軸延伸ブローボトル
JP2005112440A (ja) * 2003-10-10 2005-04-28 Toyo Seikan Kaisha Ltd 容器
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
JP2010000669A (ja) * 2008-06-19 2010-01-07 Frontier:Kk 延伸ブロー成形用プリフォーム

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03286808A (ja) * 1990-04-02 1991-12-17 Yoshino Kogyosho Co Ltd 中間成形品と２軸延伸ブロー成形壜体
JPH0948061A (ja) * 1995-08-09 1997-02-18 Kureha Plast Kk 透明な底部を有するポリプロピレン２軸延伸ブローボトル
JP2005112440A (ja) * 2003-10-10 2005-04-28 Toyo Seikan Kaisha Ltd 容器
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
JP2010000669A (ja) * 2008-06-19 2010-01-07 Frontier:Kk 延伸ブロー成形用プリフォーム

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