WO2022131307A1 - 金型および樹脂製容器の製造装置 - Google Patents

金型および樹脂製容器の製造装置 Download PDF

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Publication number
WO2022131307A1
WO2022131307A1 PCT/JP2021/046352 JP2021046352W WO2022131307A1 WO 2022131307 A1 WO2022131307 A1 WO 2022131307A1 JP 2021046352 W JP2021046352 W JP 2021046352W WO 2022131307 A1 WO2022131307 A1 WO 2022131307A1
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WO
WIPO (PCT)
Prior art keywords
preform
mold
temperature
movable plate
cam hole
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2021/046352
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
大三郎 竹花
侑大 市橋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nissei ASB Machine Co Ltd
Original Assignee
Nissei ASB Machine Co Ltd
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 Nissei ASB Machine Co Ltd filed Critical Nissei ASB Machine Co Ltd
Priority to CN202180091034.4A priority Critical patent/CN116847972B/zh
Priority to EP21906668.5A priority patent/EP4265387B1/en
Priority to US18/266,919 priority patent/US12263629B2/en
Priority to JP2022570045A priority patent/JP7565380B2/ja
Publication of WO2022131307A1 publication Critical patent/WO2022131307A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/48—Moulds
    • B29C49/4823—Moulds with incorporated heating or cooling means
    • 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
    • B29C49/061—Injection blow-moulding with parison holding means displaceable between injection and blow stations
    • B29C49/062—Injection blow-moulding with parison holding means displaceable between injection and blow stations following an arcuate path, e.g. rotary or oscillating-type
    • 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
    • B29B13/00—Conditioning or physical treatment of the material to be shaped
    • B29B13/02—Conditioning or physical treatment of the material to be shaped by heating
    • 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
    • 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
    • B29C49/4823—Moulds with incorporated heating or cooling means
    • B29C2049/4838—Moulds with incorporated heating or cooling means for heating moulds or mould parts
    • 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
    • B29C2949/30—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
    • 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
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/6409—Thermal conditioning of preforms
    • B29C49/6427—Cooling of preforms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • 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
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • 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 mold and a resin container manufacturing apparatus.
  • the hot parison type blow molding method is a method of blow molding a resin container by utilizing the heat possessed during injection molding of the preform, and is a resin container having a variety of aesthetic appearances as compared with the cold parison method. It is advantageous in that it can be manufactured.
  • the preform after injection molding has temperature unevenness (uneven temperature) in the circumferential direction due to, for example, misalignment of the injection molding die.
  • temperature unevenness uneven temperature
  • the present invention has been made in view of such a problem, and an object thereof is to provide a mold capable of realizing appropriate position adjustment of a cavity mold with respect to a preform with good workability.
  • One aspect of the present invention is a mold provided with a position adjusting mechanism that receives a shaft portion extending from a cavity mold accommodating a preform and adjusts a holding position of the cavity mold in a plane intersecting the extension direction of the shaft portion.
  • the position adjustment mechanism is arranged so as to overlap the first member having a linear cam hole for receiving the shaft portion and the first member in the extension direction of the shaft portion, and rotate with respect to the first member along a plane.
  • a second member is provided.
  • the second member has an elongated hole that intersects the cam hole in the plane direction and positions the shaft portion together with the cam hole. Further, due to the rotation of the second member, the position where the cam hole and the elongated hole intersect is moved along the longitudinal direction of the cam hole.
  • (A) is a plan view of the movable plate of the second embodiment
  • (b) is a plan view of the fixed plate of the second embodiment. It is a figure which shows the rotation state of a movable plate and a fixed plate in 2nd Embodiment. It is sectional drawing which shows the positional relationship between the middle type and the preform corresponding to FIG.
  • FIG. 1 is a block diagram schematically showing the configuration of the blow molding apparatus 20.
  • the blow molding device 20 of the first embodiment is a hot parison type (also referred to as a one-stage method) device that blow-molds the preform 10 by utilizing the retained heat (internal heat amount) at the time of injection molding without cooling it to room temperature. Is.
  • the blow molding device 20 includes an injection molding unit 21, a temperature adjusting unit 22, a blow molding unit 23, a take-out unit 24, and a transport mechanism 26.
  • the injection molding unit 21, the temperature adjusting unit 22, the blow molding unit 23, and the take-out unit 24 are arranged at positions rotated by a predetermined angle (for example, 90 degrees) about the transport mechanism 26.
  • the blow molding apparatus 20 includes at least one row of neck molds 27, which will be described later.
  • the molds of each portion (cavity mold 31 of the temperature adjusting unit 22 described later) are also configured with the same number of rows.
  • the transfer mechanism 26 includes a transfer plate (not shown) that moves so as to rotate about an axis in the direction perpendicular to the paper surface of FIG. 1.
  • a transfer plate On the transfer plate, one or more neck molds 27 (not shown in FIG. 1) holding the neck of the preform 10 or the resin container (hereinafter, simply referred to as a container) are arranged at each predetermined angle.
  • the transfer mechanism 26 moves the transfer plate by 90 degrees to transfer the preform 10 (or container) whose neck is held by the neck mold 27 to the injection molding unit 21, the temperature control unit 22, the blow molding unit 23, It is conveyed in the order of the take-out unit 24.
  • the transport mechanism 26 is further provided with an elevating mechanism (vertical mold opening / closing mechanism) and a mold opening mechanism of the neck mold 27, and operates to raise and lower the transfer plate, and mold closing and mold opening (release) in the injection molding unit 21 and the like.
  • the operation related to the mold) is also performed.
  • the transfer plate may be a single disk-shaped member that holds all the neck molds of each molding station, or may be a configuration in which fan-shaped members that hold the neck molds are gathered at each molding station. I do not care.
  • the injection molding unit 21 includes an injection cavity type and an injection core type, which are not shown, respectively, and manufactures the preform 10.
  • An injection device 25 that supplies a resin material that is a raw material of the preform 10 is connected to the injection molding unit 21.
  • the above-mentioned injection cavity type and injection core type and the neck type 27 of the transport mechanism 26 are closed to form a preform-shaped mold space. Then, by pouring the resin material from the injection device 25 into such a preform-shaped mold space, the preform 10 is manufactured by the injection molding unit 21.
  • the overall shape of the preform 10 is a bottomed cylindrical shape in which one end side is opened and the bottom portion 14 on the other end side is closed.
  • a neck portion 12 is formed at the end portion of the preform 10 on the opening side.
  • the material of the container and the preform 10 is a thermoplastic synthetic resin, and can be appropriately selected according to the use of the container.
  • specific types of materials include, for example, PET (polyethylene terephthalate), PEN (polyethylene naphthalate), PCTA (polycyclohexanedimethylene terephthalate), Tritan (Tritan (registered trademark): copolyester manufactured by Eastman Chemical Co., Ltd.).
  • PP polypropylene
  • PE polyethylene
  • PC polyethylene
  • PES polyyester sulfone
  • PPSU polyphenyl sulfone
  • PS polystyrene
  • COP / COC cyclic olefin polymer
  • PMMA polymethacrylic acid
  • PLA polylactic acid
  • the neck mold 27 of the transport mechanism 26 is not opened and the preform 10 is held and conveyed as it is.
  • the number of preforms 10 simultaneously molded by the injection molding unit 21 (that is, the number of containers that can be simultaneously molded by the blow molding apparatus 20) can be appropriately set.
  • the temperature adjusting unit 22 performs temperature equalization and uneven temperature removal of the preform 10 manufactured by the injection molding unit 21, and sets the temperature of the preform 10 to a temperature suitable for blow molding (for example, about 90 ° C to 105 ° C). Adjust to have a temperature distribution suitable for the shape of the container to be shaped. Further, the temperature adjusting unit 22 may have a function of cooling the preform 10 in a high temperature state after injection molding.
  • FIG. 2 is a diagram showing a configuration example of the temperature adjusting unit 22.
  • the temperature control unit 22 has a cavity type (temperature control pot) 31 capable of accommodating the preform 10.
  • the cavity type 31 has a space for temperature adjustment having substantially the same shape as the outer shape of the preform 10 manufactured by the injection molding unit 21.
  • the temperature adjusting unit 22 may further include a mold member (temperature adjusting rod) to be inserted inside the preform 10.
  • the temperature adjusting space for accommodating the preform of the cavity type 31 may have a perfect circular shape, an elliptical shape, or a polygonal shape in the horizontal direction, if necessary.
  • the cavity type 31 of the first embodiment is composed of one or more steps in the axial direction of the preform 10.
  • the cavity type 31 is preferably divided into three stages in the axial direction of the preform 10, and includes, for example, an upper stage type 32, a middle stage type 33, and a lower stage type 34.
  • the upper mold 32 is a mold facing the outer surface near the neck portion 12 of the preform 10.
  • the middle mold 33 is a mold facing the outer surface of the body portion 13 of the preform 10.
  • the lower mold 34 is a mold facing the outer surface of the bottom 14 of the preform 10.
  • the bottom surface of the upper die 32 and the upper surface of the middle die 33 are engaged by the first inlay 35, and the bottom surface of the middle die 33 and the upper surface of the lower die 34 are engaged by the second inlay 36.
  • a columnar shaft portion 34a projecting toward the bottom portion along the vertical direction (axial direction of the preform 10) is formed.
  • a heating member such as a band heater is attached to the upper type 32, the middle type 33, and the lower type 34 of the cavity type 31, respectively. Therefore, the temperatures of the upper mold 32, the middle mold 33, and the lower mold 34 are maintained at predetermined temperatures by the heating members, respectively. Further, the temperature distribution in the axial direction of the preform 10 can be changed by changing the temperature of the heating member of the upper type 32, the middle type 33 and the lower type 34.
  • the number of stages constituting the cavity type 31 may be appropriately changed from 1 stage to about 10 stages depending on the length of the body portion 13 of the preform 10.
  • the cavity type 31 is sandwiched and fixed to the upper support plate 37 and the lower support plate 38 from both sides.
  • the upper support plate 37 has an opening 37a having a shape corresponding to the neck mold 27, and is arranged on the upper surface side of the upper mold 32. Further, the upper support plate 37 is connected to the lower support plate 38 by a plurality of fixing bolts (fixing members) 39 extending in the vertical direction.
  • fixing bolts fixing members
  • the lower support plate 38 is fixed to the lower base (not shown) of the blow molding apparatus 20.
  • a position adjusting mechanism 40 for adjusting the position of the cavity type 31 is provided on the upper surface of the lower support plate 38. Then, the lower support plate 38 holds the shaft portion 34a of the lower stage type 34 via the position adjusting mechanism 40.
  • the position adjusting mechanism 40 has a function of adjusting the holding position of the cavity type 31 in the one-dimensional direction (or the horizontal direction) on the plane of the lower support plate 38 orthogonal to the vertical direction.
  • the position adjusting mechanism 40 includes a fixing plate 41 fixed to the lower support plate 38, a movable plate 42, a spacer 49, and a holding member 44.
  • the fixed plate 41 is an example of the first member
  • the movable plate 42 is an example of the second member.
  • the fixed plate 41, the movable plate 42, and the spacer 49 are all members having a disk shape as a whole, for example.
  • the fixing plate 41, the movable plate 42, and the spacer 49 are laminated and arranged on the lower support plate 38 in this order from the bottom.
  • the shaft portion 34a of the lower mold 34 is inserted through the fixed plate 41, the movable plate 42, and the spacer 49.
  • FIG. 4 is a perspective view showing the positional relationship between the fixed plate 41, the movable plate 42, and the lower mold 34.
  • the spacer 49 is not shown for the sake of simplicity.
  • the pressing member 44 is composed of, for example, two half-split ring-shaped block members.
  • the pressing member 44 has a space inside for arranging the fixing plate 41, the movable plate 42, and the spacer 49, and each of them is fixed to the lower support plate 38 with a bolt (fixing member) 45.
  • the pressing member 44 surrounds and holds the fixing plate 41, the movable plate 42, and the spacer 49 from the outer peripheral side.
  • the pressing member 44 has a function of holding the position of the movable plate 42 in the rotational direction with respect to the fixing plate 41 by pressing the movable plate 42 against the fixing plate 41 from above via the spacer 49.
  • the fixing plate 41 and the lower support plate 38 may be fixed via a positioning pin or the like (not shown).
  • FIG. 5A is a plan view of the movable plate 42.
  • the movable plate 42 has a disk-shaped movable plate main body 42a and a columnar convex portion 42b formed on the bottom surface side of the movable plate main body 42a.
  • the convex portion 42b is formed at a position eccentric with respect to the center of the movable plate main body 42a.
  • the movable plate 42 is formed with a long hole (first long hole) 42c that penetrates the movable plate main body 42a and the convex portion 42b.
  • the width W of the elongated hole 42c in the lateral direction is set to a dimension that allows the shaft portion 34a of the lower die 34 to pass through.
  • FIG. 5B is a plan view of the fixing plate 41.
  • the fixing plate 41 has a disk-shaped fixing plate main body 41a and a bottomed cylindrical concave portion 41b formed on the upper surface side of the fixing plate main body 41a.
  • the concave portion 41b is formed at a position eccentric with respect to the center of the fixed plate main body 41a, and rotatably receives the convex portion 42b of the movable plate 42 arranged on the upper surface side.
  • the concave portion 41b has a shape corresponding to the convex portion 42b, and is set to a dimension capable of axially supporting the convex portion 42b.
  • a cam hole (second long hole) 41c for receiving the shaft portion 34a of the lower mold 34 is formed on the bottom surface of the recess 41b of the fixing plate 41.
  • the cam hole 41c has a shape extending linearly in the longitudinal direction through the center of the fixing plate main body 41a.
  • the width W of the cam hole 41c in the lateral direction is set to a dimension that allows the shaft portion 34a of the lower die 34 to pass through.
  • the cam hole 41c partially overlaps the position of the elongated hole 42c of the movable plate 42, but is formed so that the longitudinal direction of the cam hole 41c intersects the elongated hole 42c.
  • FIG. 6A is a plan view of the fixed plate 41 overlaid with the movable plate 42.
  • FIG. 6B is a diagram showing a state in which the movable plate 42 is rotated from FIG. 6A.
  • the convex portion 42b of the movable plate 42 is pivotally supported by the concave portion 41b of the fixed plate 41, and the movable plate 42 is rotated with the convex portion 42b and the concave portion 41b as rotation axes. Can be moved.
  • the convex portion 42b of the movable plate 42 is fitted into the concave portion 41b of the fixed plate 41, and the convex portion 42b is rotated with respect to the concave portion 41b while the outer peripheral surface of the convex portion 42b is brought into contact with the inner peripheral surface of the concave portion 41b.
  • the movable plate 42 may be rotated.
  • the elongated hole 42c of the movable plate 42 intersects with the cam hole 41c of the fixed plate 41. It will be arranged. Therefore, when the shaft portion 34a of the lower die 34 is inserted into the movable plate 42 and the fixed plate 41, the shaft is formed between the inner surface of the cam hole 41c in the lateral direction and the inner surface of the elongated hole 42c intersecting the cam hole 41c in the lateral direction. The portion 34a is constrained and positioned. As a result, the cavity type 31 can be positioned and held by the movable plate 42 and the fixed plate 41.
  • the position where the shaft portion 34a can be inserted moves by a predetermined distance on the longitudinal side of the cam hole 41c according to the rotation angle of the movable plate 42 with respect to the fixed plate 41, and the moving distance of the cavity type 31 is accurately determined ( Specified).
  • the fixing plate 41 can be fixed in a state of being rotated by a predetermined angle with respect to the lower support plate 38. Therefore, the portion in the circumferential direction to be heated can be aligned with the cavity type 31 with respect to the preform 10 which is supported by the neck type 27 and cannot rotate.
  • the blow molding unit 23 performs stretch blow molding on the preform 10 whose temperature has been adjusted by the temperature adjusting unit 22 to manufacture a container.
  • the blow molding unit 23 includes a blow cavity type, which is a pair of split molds corresponding to the shape of the container, a bottom mold, a drawing rod, and an air introduction member (all not shown).
  • the blow molding unit 23 blow molds while stretching the preform 10. As a result, the preform 10 can be shaped into a blow cavity type shape to manufacture a container.
  • the take-out section 24 is configured to open the neck of the container manufactured by the blow molding section 23 from the neck mold 27 and take out the container to the outside of the blow molding device 20.
  • FIG. 7 is a flowchart showing the process of the blow molding method.
  • an unbalanced temperature adjusting step (which adjusts the position of the mold of the temperature adjusting unit 22 based on the result of the test operation) ( S100) is performed.
  • Step S100 Unbalanced temperature adjustment step
  • the temperature is determined according to the temperature distribution of the injection-molded preform 10 in the test operation or the wall thickness distribution of the blow-molded container in the test operation. This is a step of adjusting the position of the cavity mold 31 of the adjusting unit 22.
  • the blow molding apparatus 20 is subjected to a test operation to obtain information on the temperature distribution of the preform 10 or information on the wall thickness distribution of the container before adjustment.
  • the position of the cavity type 31 in the temperature adjusting unit 22 is adjusted as follows. In the following description, as an example, adjustment is made so that the bias of the temperature distribution of the preform 10 and the wall thickness distribution of the container in the circumferential direction becomes small.
  • the operator removes the upper support plate 37, the cavity mold 31, and the holding member 44.
  • the holding member 44 is removed, and the upper support plate 37, the cavity type 31, the spacer 49, the movable plate 42, and the fixing plate 41 are loosened to an adjustable position.
  • the fixing plate 41 is placed on the upper portion so that the position in the circumferential direction where the temperature of the body portion 13 of the preform 10 is uneven is arranged on the extension line of the long axis (longitudinal direction) of the cam hole 41c of the fixing plate 41. Rotate with respect to the support plate 38.
  • the operator rotates the movable plate 42 of the position adjusting mechanism 40 to adjust the position where the shaft portion 34a is held on the cam hole 41c of the fixing plate 41.
  • the distance between the high temperature part of the preform 10 and the cavity type 31 is separated (the amount of heating is reduced), and the distance between the low temperature part of the preform 10 and the cavity type 31 is close (the amount of heating is increased).
  • the position where the shaft portion 34a is held may be adjusted by the position adjusting mechanism 40.
  • the portion having a high temperature during the test operation in the circumferential direction of the preform 10 is less likely to be heated by the cavity type 31, and the bias of the temperature distribution in the circumferential direction of the preform 10 can be reduced.
  • the portion of the preform 10 in the circumferential direction to be heated can be reliably aligned with the cavity type 31.
  • the position adjustment (distance adjustment) work of the cavity type 31 and the preform 10 only the holding member 44 is removed, and the shaft portion 34a of the cavity type 31 is inserted into the elongated hole 42c of the movable plate 42 and the cam hole 41c of the fixed plate.
  • the method may be performed by fixing the movable plate 42 again with the pressing member 44.
  • the high temperature portion of the preform 10 has a large holding heat, and the preform 10 is easily stretched. That is, the portion where the wall thickness of the container is thin corresponds to the portion where the temperature of the preform 10 is high.
  • the portion where the temperature of the preform 10 is low has a smaller retained heat than the portion where the temperature of the preform 10 is high, and the preform 10 is less likely to be stretched. That is, the portion where the wall thickness of the container is thick corresponds to the portion where the temperature of the preform 10 is low.
  • the part where the wall thickness of the container is thin is regarded as the part where the temperature of the preform 10 is high, and the part where the wall thickness of the container is thick is It may be regarded as a portion where the temperature of the reform 10 is low, and the adjustment may be performed in the same manner as described above.
  • each step of the blow molding cycle shown below is executed.
  • Step S101 Injection molding process
  • resin is injected from the injection device 25 into the preform-shaped mold space formed by the injection cavity type, the injection core type, and the neck type 27 of the transport mechanism 26, and the preform 10 is manufactured. Will be done.
  • step S101 when the injection molding of the preform 10 is completed, the injection molding portion 21 is opened and the preform 10 is released from the injection cavity type and the injection core type.
  • the transfer plate of the transfer mechanism 26 is moved so as to rotate by a predetermined angle, and the preform 10 held by the neck mold 27 is transferred to the temperature adjusting unit 22.
  • Step S102 Temperature adjustment step
  • the preform 10 is housed in the temperature adjustment space of the cavity type 31. Since the cavity type 31 corresponds to the shape of the preform 10, the shape of the preform is maintained as a desired shape even in the temperature adjusting step.
  • the preform 10 faces the cavity mold 31, so that the temperature of the preform 10 is adjusted so as not to be lower than the temperature suitable for blow molding, and the uneven temperature generated during injection molding is also reduced.
  • the position of the cavity type 31 is appropriately adjusted by the position adjusting mechanism 40 in the temperature deviation adjusting step (S100), the temperature deviation in the circumferential direction of the preform 10 can be reduced.
  • the transfer plate of the transfer mechanism 26 moves so as to rotate by a predetermined angle, and the temperature-adjusted preform 10 held in the neck mold 27 is transferred to the blow molding unit 23.
  • Step S103 Blow molding process
  • the blow molding unit 23 performs blow molding of the container.
  • the blow cavity mold is closed, the preform 10 is accommodated in the mold space, and the air introduction member (blow core) is lowered, so that the air introduction member is brought into contact with the neck of the preform 10.
  • the drawing rod vertical length stretching member
  • blow air is supplied from the air introducing member to supply the preform 10. Is stretched on the horizontal axis.
  • the preform 10 is swelled and shaped so as to be in close contact with the blow cavity type mold space, and is blow molded into a container.
  • the bottom mold waits at a lower position where it does not come into contact with the bottom of the preform 10 before the blow cavity mold is closed, and quickly rises to the molding position before or after the mold is closed.
  • Step S104 Container removal step
  • the blow cavity mold and the bottom mold are opened.
  • the container can be moved from the blow molding unit 23.
  • the transfer plate of the transfer mechanism 26 moves so as to rotate by a predetermined angle, and the container is transferred to the take-out unit 24.
  • the neck portion of the container is released from the neck mold 27, and the container is taken out to the outside of the blow molding apparatus 20.
  • the blow molding apparatus 20 of the first embodiment includes a position adjusting mechanism 40 for adjusting the position of the cavity type 31 of the temperature adjusting unit 22.
  • the position adjusting mechanism 40 is arranged so as to overlap the fixed plate 41 on which the linear cam hole 41c for receiving the shaft portion 34a of the cavity type 31 is formed and the fixed plate 41 in the extension direction of the shaft portion 34a, along a plane.
  • a movable plate 42 that rotates with respect to the fixed plate 41 is provided.
  • the movable plate 42 has an elongated hole 42c that intersects the cam hole 41c in the plane direction and positions the shaft portion 34a together with the cam hole 41c. Then, due to the rotation of the movable plate 42, the position where the cam hole 41c and the elongated hole 42c intersect moves along the longitudinal direction of the cam hole 41c.
  • each stage for example, the upper type 32, the middle type 33, and the lower type 34 constituting the cavity type 31 is individually adjusted in the horizontal direction. After that, it is necessary to connect (fix), which makes the position adjustment work complicated.
  • the position adjusting mechanism 40 of the first embodiment by rotating the movable plate 42 with respect to the fixed plate 41, the position where the shaft portion 34a of the cavity type 31 is held moves along the cam hole 41c. do.
  • the appropriate position adjustment of the cavity type 31 with respect to the preform 10 can be performed with good workability only by adjusting the position of the movable plate 42, and the temperature in the circumferential direction of the preform 10 can be adjusted. Adjustment (heating degree) can be achieved with high accuracy. That is, the temperature of the preform 10 can be adjusted accurately in the circumferential direction only by rotating the fixed plate 41 and the movable plate 41 relatively in the horizontal direction. Further, according to the first embodiment, the adjusted position of the cavity type 31 can be easily restored by a method such as marking the position of the movable plate 42 with respect to the fixed plate 41, and the temperature of the preform 10 can be adjusted. The reproducibility of the conditions (heating conditions) can be guaranteed.
  • the position adjustment mechanism 40 of the first embodiment since the fixed plate 41 and the movable plate 42 are arranged so as to overlap each other in the extension direction (extension direction) of the shaft portion 34a, the position adjustment mechanism 40 and the cavity type 31 are viewed in a plan view.
  • the projected area becomes very small. Therefore, in the first embodiment, when a plurality of or a plurality of rows of cavity molds 31 are arranged in the blow molding apparatus 20, it becomes easy to arrange the cavity molds 31 at close intervals to each other, and it becomes easy to arrange the cavity molds 31 at the time of simultaneous molding of a large number of cavities. Space saving of 31 can be realized, and it becomes easy to increase the number of containers that can be manufactured in one blow molding cycle.
  • the first embodiment is advantageous in that it does not have the above-mentioned problems.
  • the second embodiment is a modification of the first embodiment, and has a configuration in which a positioning portion between the fixed plate 41 and the movable plate 42 is provided.
  • the positioning portion of the second embodiment is composed of a plunger 46 for moving the locking piece 46a on the fixed plate 41 side and a receiving groove 43 as a receiving portion for receiving the locking piece on the movable plate 42 side.
  • the configurations of the fixed plate 41 and the movable plate 42 of the position adjusting mechanism 40 are different from those in the first embodiment. Therefore, in the description of the second embodiment, the same reference numerals are given to the same configurations as those of the first embodiment, and duplicate description will be omitted.
  • FIG. 8A is a plan view of the movable plate 42 of the second embodiment.
  • the movable plate 42 of the second embodiment has at least two or more recessed receiving grooves 43 as an example of the receiving portion on the lower surface (bottom surface) side of the movable plate main body 42a and the columnar convex portion 42b, for example, five. It is formed.
  • the receiving grooves 43a-43e are arranged side by side along the outer circumference of the columnar convex portion 42b, and one of the receiving grooves 43a-43e receives the locking piece 46a on the fixing plate 41 side, which will be described later.
  • a notch (first index portion) 47 used as a mark for alignment with the fixed plate 41 is formed on the outer periphery of the movable plate main body 42a.
  • the configuration and function of the convex portion 42b and the elongated hole 42c are the same as those in the first embodiment.
  • the shape of the notch (first index portion) 47 is preferably a notch shape as shown in FIG. 8A, but may be a convex shape protruding from the outer periphery of the movable plate main body 42a.
  • FIG. 8B is a plan view of the fixing plate 41 of the second embodiment.
  • one plunger (locking member) 46 is embedded and arranged in the inner peripheral surface of the recess 41b.
  • the plunger 46 has, for example, a ball-shaped locking piece 46a that is urged inside the recess 41b by a spring (not shown).
  • the locking piece 46a may be pin-shaped.
  • the convex portion 42b of the movable plate 42 is pivotally supported by the concave portion 41b of the fixed plate 41, and the movable plate 42 is rotated with the convex portion 42b and the concave portion 41b as rotation axes. Can be moved.
  • the convex portion 42b of the movable plate 42 is fitted into the concave portion 41b of the fixed plate 41, and the convex portion 42b is rotated with respect to the concave portion 41b while the outer peripheral surface of the convex portion 42b is brought into contact with the inner peripheral surface of the concave portion 41b.
  • the movable plate 42 may be rotated.
  • the locking piece 46a urged inside the concave portion 41b is locked to the receiving groove of the convex portion 42b, and the fixing plate is fixed.
  • the movable plate 42 is positioned with respect to 41.
  • the movable plate 42 is positioned with respect to the fixed plate 41 at the five positions where the receiving grooves 43a-43e and the plunger 46 overlap.
  • At least two or more, for example, five notches (second index portion) 48 used for positioning with the notch (first index portion) 47 of the movable plate 42. (48a-48e) is formed.
  • the notch 48a is formed at a position where it overlaps with the notch 47 when the locking piece 46a is locked in the receiving groove 43a.
  • the notch 48b is formed at a position where it overlaps with the notch 47 when the locking piece 46a is locked in the receiving groove 43b.
  • the notch 48c is formed at a position where it overlaps with the notch 47 when the locking piece 46a is locked in the receiving groove 43c.
  • the notch 48d is formed at a position where the locking piece 46a overlaps with the notch 47 when the locking piece 46a is locked in the receiving groove 43d.
  • the notch 48e is formed at a position where it overlaps with the notch 47 when the locking piece 46a is locked in the receiving groove 43e.
  • the shape of the notch (first index portion) 48 is preferably a notch as shown in FIG. 8B, but may be a convex shape protruding from the outer periphery of the fixing plate 41.
  • the fixing plate 41 is opened with a plurality of pin holes 41d at regular intervals in the circumferential direction.
  • the pin hole 41d of the fixing plate 41 penetrates the lower support plate 38 and receives a positioning pin (not shown) inserted from below.
  • the fixing plate 41 arranged on the lower support plate 38 is positioned on the lower support plate 38 by the positioning pin.
  • FIGS. 9 (a)-(e) are views showing the rotational state of the movable plate 42 and the fixed plate 41 in the second embodiment, and the movable plate 42 is formed from FIGS. 9 (a) to 9 (e). It shows the change when it is rotated in the clockwise direction.
  • the cavity type 31 is first removed, and then the holding member 44 and the spacer 49 of the position adjusting mechanism 40 are removed for adjustment.
  • the holding member 44 may be removed, and the upper support plate 37, the cavity type 31, the spacer 49, the movable plate 42, and the fixing plate 41 may be loosened to the extent that the positions can be adjusted.
  • the locking piece 46a is locked in the receiving groove 43a, and the notch 47 is at a position overlapping the notch 48a. Further, the elongated hole 42c of the movable plate 42 intersects with the cam hole 41c of the fixed plate 41. Therefore, in the state of FIG. 9A, when the shaft portion 34a of the lower mold 34 is inserted into the movable plate 42 and the fixing plate 41, the inner surface of the cam hole 41c in the lateral direction and the elongated hole 42c intersecting the cam hole 41c. The shaft portion 34a is constrained and positioned with the inner surface in the lateral direction of the shaft portion 34a.
  • FIG. 9B When the movable plate 42 is rotated clockwise from FIG. 9A, the state shown in FIG. 9B is obtained.
  • the locking piece 46a is locked to the receiving groove 43b, and the notch 47 is at a position overlapping the notch 48b.
  • the position where the shaft portion 34a is held shifts to the upper side in the figure as compared with FIG. 9A.
  • FIG. 9C the locking piece 46a is locked to the receiving groove 43c, and the notch 47 is at a position overlapping the notch 48c. Further, in FIG. 9 (c), the position where the shaft portion 34a is held shifts to the upper side in the figure as compared with FIG. 9 (b).
  • FIG. 9D the locking piece 46a is locked to the receiving groove 43d, and the notch 47 is at a position overlapping the notch 48d. Further, in FIG. 9 (d), the position where the shaft portion 34a is held shifts to the upper side in the figure as compared with FIG. 9 (c).
  • FIG. 9 (e) When the movable plate 42 is rotated clockwise from FIG. 9 (d), the state shown in FIG. 9 (e) is obtained.
  • the locking piece 46a is locked to the receiving groove 43e, and the notch 47 is at a position overlapping the notch 48e.
  • the position where the shaft portion 34a is held shifts to the upper side in the figure as compared with FIG. 9 (d).
  • the locking piece 46a and the locking position of the receiving groove 43 are moved next to each other, that is, the overlapping position of the notch (first index portion) 47 and the notch (second index portion) 48 is set.
  • the shaft portion 34a or the cavity type 31 moves (approaches or separates) by a certain distance (for example, 0.3 mm or 0.5 mm) with respect to the body portion 13 of the preform 10.
  • FIGS. 10A to 10E are cross-sectional views showing the positional relationship between the middle stage type 33 and the preform 10. 10 (a)-(e) correspond to the position adjustment of the shaft portion 34a according to FIGS. 9 (a)-(e), respectively.
  • FIG. 10 (a) corresponding to FIG. 9 (a)
  • the preform 10 is concentrically arranged in the center of the middle stage type 33.
  • the position where the shaft portion 34a is held is shifted to the upper side in the figure, so that the cavity type 31 (middle stage) in FIGS. 10 (b)-(e).
  • the position of the mold 33) is also shifted to the upper side in the figure.
  • the preform 10 is eccentrically arranged with respect to the cavity type 31 (middle stage type 33) due to the shift of the cavity type 31 due to the position adjustment of the shaft portion 34a. Become.
  • the amount of eccentricity of the cavity type 31 with respect to the preform 10 is the largest in FIG. 10 (e), decreases in the order of FIGS. 10 (d), 10 (c), and 10 (b), and is shown in FIG. 10 (a). Then the amount of eccentricity becomes zero.
  • the plunger 46 is locked to any of the receiving grooves 43a-43e, so that the rotating movable plate 42 is positioned at a predetermined position with respect to the fixed plate 41. Will be done.
  • the eccentricity amount of the cavity type 31 with respect to the preform 10 that is, the degree of heating in the circumferential direction of the preform 10.
  • the operator can confirm the amount of eccentricity of the position adjusting mechanism 40 by aligning the notch 47 and the notch 48a-48e, so that the workability in the temperature deviation adjusting step is also improved.
  • the configuration of the cavity type 31 of the above embodiment is an example, and is not limited to the above embodiment.
  • the blow molding apparatus 20 of the above embodiment may have, for example, a configuration including a plurality of injection molding portions (so-called 5-station type configuration). At this time, a configuration in which an additional temperature adjusting unit is further arranged between the injection molding units (so-called 6-station type configuration) may be used.
  • the configurations of the fixed plate 41 and the movable plate 42 of the above embodiment are merely examples, and for example, a convex portion may be formed on the fixed plate 41 side and a concave portion may be formed on the movable plate 42 side.
  • the movable plate 41 and the fixed plate 41 may have convex portions and concave portions that can rotate in a complementary manner, and the outer shape may be polygonal rather than disk-shaped.
  • the outer diameter of the pressing member 44 may be a polygonal half-split member having a hollow region on the lower side as long as the movable plate 42 and the fixing plate 43 can be held.
  • a part of the body of the preform in the circumferential direction may be locally heated and used to form a flat container or the like.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
PCT/JP2021/046352 2020-12-15 2021-12-15 金型および樹脂製容器の製造装置 Ceased WO2022131307A1 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CN202180091034.4A CN116847972B (zh) 2020-12-15 2021-12-15 模具及树脂制容器的制造装置
EP21906668.5A EP4265387B1 (en) 2020-12-15 2021-12-15 Mold and device for manufacturing resin container
US18/266,919 US12263629B2 (en) 2020-12-15 2021-12-15 Mold and device for manufacturing resin container
JP2022570045A JP7565380B2 (ja) 2020-12-15 2021-12-15 金型および樹脂製容器の製造装置

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JP2020207555 2020-12-15
JP2020-207555 2020-12-15

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JP7797544B2 (ja) * 2022-01-28 2026-01-13 日精エー・エス・ビー機械株式会社 温度調整用金型、樹脂製容器の製造装置

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EP4265387C0 (en) 2025-12-03
JP7565380B2 (ja) 2024-10-10
US12263629B2 (en) 2025-04-01
CN116847972A (zh) 2023-10-03
EP4265387A1 (en) 2023-10-25
EP4265387B1 (en) 2025-12-03
CN116847972B (zh) 2026-02-03
US20240051213A1 (en) 2024-02-15
JPWO2022131307A1 (https=) 2022-06-23

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