WO2020217596A1 - Method for manufacturing resin container, apparatus for manufacturing resin container, and resin container - Google Patents

Method for manufacturing resin container, apparatus for manufacturing resin container, and resin container Download PDF

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Publication number
WO2020217596A1
WO2020217596A1 PCT/JP2020/000085 JP2020000085W WO2020217596A1 WO 2020217596 A1 WO2020217596 A1 WO 2020217596A1 JP 2020000085 W JP2020000085 W JP 2020000085W WO 2020217596 A1 WO2020217596 A1 WO 2020217596A1
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WO
WIPO (PCT)
Prior art keywords
mold
flange
resin container
bent
bent portion
Prior art date
Application number
PCT/JP2020/000085
Other languages
French (fr)
Japanese (ja)
Inventor
澤田　純
Original Assignee
東罐興業株式会社
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 東罐興業株式会社 filed Critical 東罐興業株式会社
Priority to JP2021515784A priority Critical patent/JP7340008B2/en
Publication of WO2020217596A1 publication Critical patent/WO2020217596A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • 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
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/10—Forming by pressure difference, e.g. vacuum
    • 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
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/26—Component parts, details or accessories; Auxiliary operations
    • B29C51/46—Measuring, controlling or regulating
    • 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

Definitions

  • the present invention relates to a method for manufacturing a resin container, an apparatus for manufacturing a resin container, and a resin container.
  • Some resin containers such as transparent resin cups have a flange at the upper end thereof (for example, Patent Document 1).
  • a resin container is manufactured by air pressure / vacuum forming (molding in which at least one of pressure air forming and vacuum forming is performed).
  • a resin container is made by heating a sheet material made of a thermoplastic resin, sandwiching an annular portion of the heated sheet material to be a flange with a pair of dies, and then performing pressure air / vacuum forming. (Cup-shaped container) is manufactured.
  • An object of the present invention is to prevent warping of the upper end portion of the body portion of a resin container.
  • the method for manufacturing a resin container according to the first aspect of the present invention is as follows.
  • a resin container having a tubular body, a bottom that closes the lower opening of the body, a bent portion that bends outward from the upper end of the body, and a flange that projects outward from the bent portion. It is a manufacturing method of Among the heated thermoplastic resin sheet materials, a first annular portion formed on the flange, an upper end portion including the upper end of the body portion, and a second annular portion formed on the bent portion are provided.
  • the first mold includes a 1-1 surface corresponding to the flange and a 1-2 surface corresponding to the upper end portion and the bent portion.
  • the second mold includes a 2-1 surface corresponding to the flange and a 2-2 surface corresponding to the upper end portion and the bent portion.
  • the first annular portion is formed into the flange by being sandwiched between the 1-1 surface and the 2-1 surface and cooled.
  • the second annular portion is formed into the upper end portion and the bent portion by being sandwiched between the first and second surfaces and the second and second surfaces and cooled.
  • the resin container manufacturing apparatus is A resin container having a tubular body, a bottom that closes the lower opening of the body, a bent portion that bends outward from the upper end of the body, and a flange that projects outward from the bent portion.
  • a manufacturing apparatus for manufacturing by performing at least one of pressure forming and vacuum forming is provided.
  • a first annular portion formed on the flange, an upper end portion including the upper end of the body portion, and a second annular portion formed on the bent portion are provided.
  • the first mold includes a 1-1 surface corresponding to the flange and a 1-2 surface corresponding to the upper end portion and the bent portion.
  • the second mold includes a 2-1 surface corresponding to the flange and a 2-2 surface corresponding to the upper end portion and the bent portion.
  • the 1-1 surface and the 2-1 surface are formed into the flange by sandwiching and cooling the first annular portion.
  • the first and second surfaces and the second and second surfaces are formed into the upper end portion and the bent portion by sandwiching and cooling the second annular portion.
  • the resin container according to the third aspect of the present invention is A resin container made of thermoplastic resin. With a tubular body The bottom that closes the lower opening of the body and A bent portion bent outward from the upper end of the body portion, A flange that projects outward from the bent portion is provided.
  • the body portion is an upper end portion including the upper end portion, and has a thickness in the range of "0.57" to "1" when the thickness of the thickest portion of the bent portion is "1". Has a part.
  • FIG. 3 is an end view of a cross section of the flange of the resin container of FIG. 1 and its vicinity.
  • FIG. 3 is an end view of a cross section of a portion sandwiching a sheet material in the manufacturing apparatus of FIG.
  • FIG. 3 is an end view of a cross section of the manufacturing apparatus and the sheet material when the first mold and the second mold of the manufacturing apparatus of FIG. 3 sandwich the sheet material.
  • the end view after blow molding from the state of FIG. The end view after cutting the sheet material from the state of FIG. FIG.
  • FIG. 7 is an end view of a cross section of a portion sandwiching a sheet material in the manufacturing apparatus of FIG. 7. An end view for explaining a reference example. The end view of the flange of the resin container which concerns on the modification and the cross section in the vicinity thereof.
  • the resin container 10 is a transparent cup made of thermoplastic resin.
  • the resin container 10 includes a cylindrical body portion 11, a bottom 12 that closes the lower opening of the body portion 11, and a bent portion 13 that bends and extends radially outward from the upper end of the body portion 11.
  • a flange 14 projecting outward from the bent portion 13 is provided.
  • the cross section of the resin container 10 is a plane (vertical direction and arbitrary orientation) including the central axis thereof (here, an axis extending along the vertical direction through the center of the bottom 12). The cut surface when cut along the horizontal direction).
  • the cross section of the resin container 10 has the same shape regardless of the horizontal direction (the direction in which the plane extends when viewed from above).
  • the body portion 11 includes a book meat portion 11A and a wall thickness portion 11B (upper end portion) that extends upward from the book meat portion 11A and is thicker than the book meat portion 11A.
  • the book meat portion 11A is a portion of the body portion 11 below the alternate long and short dash line A in FIG.
  • the book meat portion 11A has a cylindrical shape that extends upward.
  • the upper end of the booklet portion 11A gradually becomes thicker upward and is connected to the wall thickness portion 11B.
  • the lower end of the book meat portion 11A is connected to the bottom 12.
  • the booklet portion 11A extends downward from the lower end of the wall thickness portion 11B.
  • the wall thickness portion 11B is a portion between the alternate long and short dash line A and the alternate long and short dash line B in FIG. 2, and is formed thicker than the book wall portion 11A.
  • the thick portion 11B has a cylindrical shape.
  • the diameter (inner diameter) of the inner peripheral surface 11BA of the thick portion 11B, the diameter (outer diameter) of the outer peripheral surface 11BB of the thick portion 11B, and the thickness of the thick portion 11B are uniform in the vertical direction (FIG. 2 and the like). Uniform in cross section).
  • the upper end of the thick portion 11B is also the upper end of the body portion 11 (a surface cut along the alternate long and short dash line B in FIG. 2).
  • the thick portion 11B includes the upper end of the body portion 11 and has a shape extending downward from the upper end. As another example of this shape, the thick portion 11B may have a cylindrical shape that extends upward.
  • the thickness of the wall thickness portion 11B is preferably substantially uniform (including uniform).
  • substantially uniform means, for example, that when the thickness of the thickest part is “1”, the thickness of the thinnest part is within the range of “1” to “0.9” (may be “0.8”). (In the case of "1", it is uniform).
  • the wall thickness portion 11B is thicker than the center and lower end portions of the book wall portion 11A. The thickness of the wall thickness portion 11B does not have to be substantially uniform.
  • the bent portion 13 is a portion between the alternate long and short dash line B and the alternate long and short dash line C in FIG.
  • the bent portion 13 has an annular shape when viewed from above, and has a shape of being bent radially outward (to the right in FIG. 2) from the upper end of the body portion 11. Specifically, as shown in FIG. 2, the bent portion 13 is bent so that its upper portion faces outward in the radial direction in the cross section. In other words, the line passing through the center in the width direction in the cross section of the bent portion 13 is bent so that the end portion on the flange 14 side of the line is directed outward in the radial direction.
  • the inner peripheral surface (upper surface) 13A and the outer peripheral surface (lower surface) 13B of the bent portion 13 have an arcuate cross section.
  • the inner peripheral surface 13A is connected to the inner peripheral surface 11BA of the thick portion 11B and the upper surface 14A of the flange 14.
  • the outer peripheral surface 13B is connected to the outer peripheral surface 11BB of the thick portion 11B and the inner surface of the recess 14C of the flange 14.
  • the flange 14 projects horizontally from the outer circumference of the bent portion 13 (the portion of the alternate long and short dash line C) toward the outside in the radial direction of the body portion 11.
  • the flange 14 is formed in an annular shape when viewed from above or below.
  • the upper surface 14A of the flange 14 is connected to the inner peripheral surface 13A of the bent portion 13.
  • the upper surface 14A is a horizontal plane orthogonal to the vertical direction.
  • the flange 14 has a lower surface 14B and a recess 14C.
  • the recess 14C is provided at the edge of the flange 14 on the bent portion 13 side (the edge on the inner peripheral side), and is located inside the annular lower surface 14B.
  • the recess 14C is formed in an upwardly recessed shape.
  • the inner surface of the recess 14C is inclined in the vertical direction, extends diagonally upward from the lower surface 14B toward the inside in the radial direction, and reaches the outer peripheral surface 13B of the bent portion 13.
  • the inner surface of the recess 14C is curved in cross section.
  • the recess 14C and the outer peripheral surface 13B form one recess R provided on the lower surface of the upper end portion of the resin container 10.
  • the lower surface 14B is a horizontal plane orthogonal to the vertical direction and is parallel to the upper surface 14A. At least one of the upper surface 14A and the lower surface 14B may be inclined outward in the radial direction.
  • the flange 14 is formed to be thicker than the bent portion 13 and the thick portion 11B because the recess 14C is provided.
  • the thickness T1 is the thickness L1 of the boundary portion between the bent portion 13 and the flange 14, and the thickness T2 is, for example, the thickness L2 of the thick portion 11B.
  • the bent portion 13 gradually becomes thinner from the flange 14 side end portion (dotted chain line C) in the cross section toward the wall thickness portion 11B side end portion (dotted chain line B).
  • the "thickness” may be the length of an object having a planar spread in a direction perpendicular to the spread.
  • the thickness of the portion P is the inner circumference of the thick portion 11B in FIG.
  • the cross-sectional line of the inner peripheral surface 13A of the surface 11BA and the bent portion 13 (the line from the alternate long and short dash line A to the alternate long and short dash line C) and the cross-sectional line of the outer peripheral surface 11BB of the thick portion 11B and the outer peripheral surface 13B of the bent portion 13 ( It is the length in the direction orthogonal to the intermediate line passing through the middle of the alternate long and short dash line A).
  • the manufacturing apparatus 100 includes a first mold 110, a second mold 120, and a cutter 130.
  • the manufacturing apparatus 100 is an apparatus for molding a sheet material S made of a thermoplastic resin to manufacture a resin container 10.
  • the cross section below refers to a cut surface when the manufacturing apparatus 100 and the resin container 10 are cut in a plane including the central axis thereof (a surface extending in the vertical direction and the horizontal direction in an arbitrary direction). ..
  • the cross sections of the first mold 110, the second mold 120, and the cutter 130 of the manufacturing apparatus 100 have the same shape regardless of the horizontal orientation (the direction in which the plane extends when viewed from above). Is.
  • the first mold 110 has a substantially cylindrical shape with a hollow inside.
  • the first mold 110 includes a lower end portion 110A thereof, a lower surface 111 which is a plane orthogonal to the vertical direction, and a convex portion 112 projecting downward from the lower surface 111 (see FIG. 4).
  • the lower end portion 110A is also a cylindrical portion having a cylindrical shape.
  • the lower surface 111 is a horizontal plane on the right side of the alternate long and short dash line F in FIG.
  • the lower surface 111 and the convex portion 112 are formed in an annular shape when viewed from below.
  • the lower surface 111 and the convex portion 112 are continuous along the radial direction, and the convex portion 112 is located inward in the radial direction.
  • the convex portion 112 includes a first curved surface 112A connected to the lower surface 111, and a second curved surface 112B connected to the first curved surface 112A and extending substantially in the vertical direction (inclined in the vertical direction) when viewed in cross section.
  • the first curved surface 112A is a surface between the alternate long and short dash lines E and F in FIG.
  • the first curved surface 112A is curved when viewed in cross section.
  • the second curved surface 112B is a surface between the alternate long and short dash lines D and E in FIG.
  • the second curved surface 112B has a cylindrical outer peripheral surface shape.
  • the lower surface 111 of the first mold 110 corresponds to the upper surface 14A of the flange 14, and has a shape for molding the upper surface 14A.
  • the first curved surface 112A corresponds to the inner peripheral surface 13A of the bent portion 13, and has a shape for forming the inner peripheral surface 13A.
  • the second curved surface 112B corresponds to the inner peripheral surface 11BA of the thick portion 11B of the body portion 11, and has a shape for forming the inner peripheral surface 11BA.
  • the second mold 120 includes a cylindrical member 121 and a cavity 122.
  • the cylindrical member 121 has a cylindrical shape.
  • the upper surface 121A of the cylindrical member 121 is a horizontal plane orthogonal to the vertical direction, and is parallel to and faces the lower surface 111 of the first mold 110.
  • the cavity 122 is fitted inside the cylindrical member 121.
  • the cavity 122 has a concave shape obtained by hollowing out the inside of the cylindrical shape from above, and the inner surface of the concave shape corresponds to the bottom 12 and the body 11 of the resin container 10, and the bottom 12 and the body 11 are formed. It has a shape to form.
  • the upper end portion 122A of the cavity 122 has a cylindrical shape, and a part (upper end) of the cavity 122 protrudes upward from the upper surface 121A of the cylindrical member 121.
  • the upper end portion 122A has an upper surface 122AA composed of a first upper surface 122AAA and a second upper surface 122AAB.
  • the upper surface 122AA is convexly curved upward when viewed in cross section.
  • the first upper surface 122AAA is a surface of the upper surface 122AA on the outer peripheral side in the radial direction from the apex portion (the portion through which the alternate long and short dash line F passes).
  • the second upper surface 122AAB is a surface of the upper surface 122AA on the inner peripheral side in the radial direction with respect to the apex portion.
  • the upper surface 122AA is connected to the upper surface 121A of the cylindrical member 121.
  • the inner peripheral surface 122AB of the upper end portion 122A has an outer peripheral surface shape of a cylinder extending in the vertical direction.
  • the upper surface 121A of the second mold 120 corresponds to the lower surface 14B of the flange 14, and has a shape for molding the lower surface 14B.
  • the upper surface 122AA of the upper end portion 122A corresponds to the concave portion R (the outer peripheral surface 13B of the bent portion 13 and the concave portion 14C of the flange 14), and has a shape for forming the concave portion R.
  • the first upper surface 122AAA of the upper surface 122AA corresponds to the recess 14C of the recess R, and has a shape for forming the recess 14C.
  • the second upper surface 122AAB of the upper surface 122AA corresponds to the outer peripheral surface 13B of the recess R, and has a shape for forming the outer peripheral surface 13B.
  • the inner peripheral surface 122AB corresponds to the outer peripheral surface 11BB of the thick portion 11B of the body portion 11, and has a shape for molding the outer peripheral surface 11BB.
  • the upper end portion of the cylindrical member 121 and the upper end portion 122A of the cavity 122 form the upper end portion 120A which is a cylindrical cylindrical portion of the second mold 120.
  • an exhaust port 122D for exhausting the air inside the cavity 122 to the outside is provided.
  • the cutter 130 has a cylindrical shape and slides in the vertical direction on the outer peripheral surface of the first mold 110 and the outer peripheral surface of the cylindrical member 121.
  • the manufacturing apparatus 100 also controls the operation of the manufacturing apparatus 100, the supply means for supplying air into the cavity 122, the drive mechanism for driving the first mold 110, the second mold 120, the cutter 130, and the like. It is provided with a control unit for the operation and other necessary devices.
  • the sheet material S is unwound from the raw fabric roll or the like and is heated by a heating device (not shown). For example, the sheet material S is heated from above and below with a heater or the like, and the sheet material S is heated to a temperature equal to or higher than the glass transition temperature.
  • the sheet material S is made of a thermoplastic resin. Examples of the thermoplastic resin include polyester resins (PET (Polyethylene terephthalate), etc.), polyolefin resins (PP (polypropylene), PE (polyethylene), etc.), polystyrene resins, polyamide resins, and polycarbonate resins. it can.
  • the sheet material S heated above is fed out between the first mold 110 and the second mold 120 of the manufacturing apparatus 100 (FIG. 3).
  • the control unit of the manufacturing apparatus 100 controls the drive mechanism of the manufacturing apparatus 100 to move the first mold 110 downward, move the second mold 120 upward, and move the sheet material S to the first. It is sandwiched between the lower end 110A of the mold 110 and the upper end 120A of the second mold 120 (FIG. 5).
  • the portion of the sheet material S that is sandwiched between the lower end portion 110A and the upper end portion 120A is an annular first annular portion S1 that subsequently becomes a flange 14, followed by a thick portion 11B and a bent portion 13 of the body portion 11. It is the second annular portion S2 of the annular shape.
  • the second annular portion S2 is located on the inner peripheral side of the first annular portion S1, and both are continuous along the radial direction.
  • the control unit of the manufacturing apparatus 100 controls the supply means to control the second mold.
  • Air is supplied through the upper opening of the 120 to deform the sheet material S and attach it to the inner surface of the cavity 122 (FIG. 6).
  • Compressed air molding is performed by supplying such air.
  • the sheet material S may be stretched using a stretching rod.
  • the air between the sheet material S and the inner surface of the cavity 122 is exhausted from the exhaust port 122D as the sheet material S is deformed.
  • the air between the sheet material S and the inner surface of the cavity 122 may be forcibly exhausted from the exhaust port 122D by an exhaust pump or the like.
  • vacuum forming is performed together with compressed air forming. It should be noted that only vacuum forming may be performed to deform the sheet material S and attach it to the inner surface of the cavity 122. In this way, the sheet material S is subjected to vacuum forming, which is a molding for supplying gas (compressed air or other gas may be used in addition to air), and molding for exhausting the gas in the cavity 122. It suffices to perform a certain vacuum forming and a compressed air / vacuum forming that performs at least one of them. The portion of the sheet material S that sticks to the inner surface of the cavity 122 is cooled by the temperature of the cavity 122, whereby the bottom 12 of the resin container 10 and the book meat portion 11A of the body portion 11, in other words, the wall thickness.
  • the remaining portions other than the portion 11B, the bent portion 13, and the flange 14 are formed. Since the sheet material S is stretched by compressed air forming and / or vacuum forming, the bottom 12 and the book meat portion 11A are thinner than the wall thickness portion 11B and the flange 14 of the body portion 11.
  • control unit of the manufacturing apparatus 100 controls the drive mechanism and moves the cutter 130 in the vertical direction to move the lower end portion 110A of the first mold 110 and the upper end portion 120A of the second mold 120 in the sheet material S.
  • the outer part is cut from the part sandwiched by and (Fig. 7).
  • the control unit of the manufacturing apparatus 100 returns the first mold 110, the second mold 120, and the cutter 130 to the initial positions, and the resin container 10 is taken out from the second mold 120.
  • FIG. 4 shows a wall thickness portion 11B, a bent portion 13, and a lower end portion 110A when the flange 14 is formed by the lower end portion 110A of the first mold 110 and the upper end portion 120A of the second mold 120. It is sectional drawing of the upper end part 120A, and is the drawing which pulled out the resin container 10 of FIG.
  • first annular portion S1 and the second annular portion S2 (FIG. 5 and the like) of the sheet material S are sandwiched between the lower end 110A of the first mold 110 and the upper end 120A of the second mold 120, the lower end 110A and the lower end 110A
  • the first annular portion S1 and the second annular portion S2 are deformed according to each shape of the upper end portion 120A.
  • the first annular portion S1 is composed of a first surface M11 (see FIG. 8) formed of the lower surface 111 of the first mold 110, an upper surface 121A of the second mold 120, and a first upper surface 122AAA. It is sandwiched by the second surface M21 (see FIG. 8). These surfaces have a shape corresponding to the flange 14.
  • the first annular portion S1 is sandwiched between the 1-1 surface M11 and the 2-1 surface M21, and is further cooled by coming into contact with the 1-1 surface M11 and the 2-1 surface M21. It is finally formed into the flange 14 by sandwiching and cooling.
  • the second annular portion S2 is a second surface M12 composed of a first curved surface 112A and a second curved surface 112B of the first mold 110, and a second upper surface 122AAB and an inner peripheral surface 122AB of the second mold 120. It is sandwiched by the 2-2 surface M22. These surfaces have a shape corresponding to the thick portion 11B and the bent portion 13.
  • the second annular portion S2 is sandwiched between the first and second surface M12 and the second and second surface M22, and is further cooled by coming into contact with the first and second surface M12 and the second and second surface M22. It is finally formed into the thick portion 11B and the bent portion 13 by sandwiching and cooling.
  • the second annular portion S2 When the second annular portion S2 is sandwiched between the first and second surface M12 and the second and second surface M22 in order to form the thick portion 11B and the bent portion 13, a part of the first and second surface M12 (particularly the first).
  • the two curved surfaces 112B) enter the second mold 120, and the first and second surface M12 and the second and second surface M22 are different from the opposite directions of the first surface M11 and the second surface M21. Oppose in the direction.
  • the facing direction between the second curved surface 112B and the inner peripheral surface 122AB is different from the facing direction between the 1-1 surface M11 and the 2-1 surface M21 (here, they are substantially orthogonal, but they are orthogonal to each other). It does not have to be).
  • the first and second surfaces M12 and 2-2 The distance from the surface M22 is substantially uniform.
  • the interval is, for example, the first and second surfaces M12 and the second along the direction in which the perpendicular line extends with respect to either the first or second surface M12 or the second or second surface M22 (here, the second or second surface M22). It is the length between the 2-2 surface M22. Further, the interval may be regarded as the same as the thickness of the space sandwiched between the first and second surfaces M12 and the second and second surfaces M22. The description of "thickness" is as described above.
  • the longest interval S1 is, for example, an interval P1 passing through the boundary between the first curved surface 112A and the second curved surface 112B of the first mold 110 (the position corresponding to the boundary between the thick portion 11B and the bent portion 13), and / Or, the interval P2 passing through the boundary between the lower surface 111 of the first mold 110 and the first curved surface 112A (the position corresponding to the boundary between the bent portion 13 and the flange 14) is set, and the shortest interval S2 is, for example, the first. 1
  • the interval P3 passing through the lower end of the second curved surface 112B of the mold 110 (the position corresponding to the boundary between the thick portion 11B and the booklet portion 11A) is set.
  • the distance between the second curved surface 112B of the first and second surface M12 and the inner peripheral surface 122AB of the second and second surface M22 is slightly wider downward (the cross section of the second curved surface 112B is in the vertical direction). On the other hand, it is slightly tilted). On the other hand, the thickness of the thick portion 11B is uniform in the vertical direction. Therefore, in FIG. 8, the inner peripheral surface 11BA of the thick portion 11B is slightly separated from the second curved surface 112B at the lower portion. This is due to shrinkage of the thick portion 11B during cooling (note that other portions also shrink appropriately depending on conditions and the like). In consideration of the shrinkage, the second curved surface 112B may be formed so that the thickness of the thick portion 11B becomes uniform.
  • the second curved surface 112B and the inner peripheral surface 122AB may be parallel to each other.
  • a cup-shaped resin container 50 is formed by sandwiching only the portion of the sheet material to be the flange 51 with the mold 61 and the mold 62, and then performing compressed air / vacuum forming. Was there.
  • the upper end portion 52 of the body portion of the resin container 50 is cooled by the mold 61, and the bent portion 53 is naturally cooled or indirectly cooled by the mold 61 and the mold 62 via a flange or the like. To. Therefore, the cooling rate of the upper end portion 52 is faster than the cooling rate of the bent portion 53.
  • the cooling rate of the upper end portion 52 also differs depending on the location. Then, here, since the thin portion of the upper end portion 52 cools better than the thick portion, the thin portion contracts faster than the other portion, and then the other portion gradually contracts. As a result, when the resin container 50 is taken out from the mold 62, the upper side of the upper end portion 52 is warped inward, for example, with the thin portion as a base point. Since the bent portion 53 and the flange 51 also follow this warp, the flange 51 is finally tilted (in FIG. 9, it rises to the right).
  • the first and second surfaces M12 and the second and second surfaces M22 form a thick portion 11B (upper end portion of the body portion 11) and a portion P which is a bent portion 13 in the sheet material S. Since the bicyclic portion S2 is sandwiched (compressed) and cooled from both the front surface and the back surface, the portion P can be cooled quickly, and the difference in cooling rate between the thick portion 11B and the bent portion 13 can be reduced (shrinkage). (The difference between the two can be reduced) and the upper end of the resin container 10 is prevented from warping (the occurrence of warping is completely eliminated, and the warping is reduced compared to the reference example). About "prevention" The same) can be done.
  • the first and second surfaces M12 can press the inner peripheral surface 11BA of the wall thickness portion 11B (the portion of the second annular portion S2 that becomes the wall thickness portion 11B), and the wall thickness portion 11B is radially inside. It is possible to prevent the line from being followed. Further, at the time of cooling, the 2nd-2nd surface M22 can press the outer peripheral surface 11BB of the wall thickness portion 11B (the portion of the second annular portion S2 to be the wall thickness portion 11B), and the wall thickness portion 11B is radially outward. It is possible to prevent it from going along.
  • the second annular portion S2 when the second annular portion S2 is sandwiched between the first and second surface M12 and the second and second surface M22, the distance between the first and second surface M12 and the second and second surface M22 is made substantially uniform. Therefore, the second annular portion S2 can be uniformly cooled (the degree of shrinkage can be made uniform), and the warp of the body portion 11 can be prevented. After the second annular portion S2 has been cooled to some extent or after the cooling is completed, compressed air / vacuum forming is performed, and the portion itself of the sheet material S to be the book meat portion 11A is also cooled substantially uniformly. Therefore, the book meat portion 11A does not warp.
  • the shape of the mold may be adjusted in consideration of the occurrence of the warp (the 1-1 surface M11 and the 2-1 surface M21 are slightly tilted). Die etc.).
  • S1: S2 1: (0.7 to 1)
  • the second annular portion S2 can be sandwiched and cooled by the first and second surface M12 and the second and second surface M22 (as described above, the first and second surface M12 is the thick portion in the second annular portion S2).
  • the thickness of the portion P (second annular portion S2 after shrinking by cooling) obtained after the cooling does not have to be uniform.
  • the bent portion 13 and the thick portion 11B may be contracted entirely or partially from the state shown in FIG. 8 (for example, the shrinkage rate is downward from the bent portion 13 to the thick portion 11B). Gradually increase, that is, the thickness may gradually decrease downward).
  • the thickest thickness (thickness of the flange 14 side end portion of the bent portion 13) T1 of the portion P of the resin container 10 in which warpage did not occur was obtained.
  • the thinnest thickness T2 of the portion P is The range of "0.57” to “1” is preferable (the first mold 110 and the second mold 120 may be designed so as to be within such a range).
  • the body portion 11 has a wall thickness portion 11B (upper end portion) having a thickness in the range of "0.57” to "1” when the thickness of the thickest portion of the bent portion 13 is "1". Good.
  • the thickness of the wall thickness portion 11B may differ depending on the location as long as it is within the range of "0.57” to "1” regardless of the location.
  • the thick portion 11B within the above range provides a structure that easily prevents warpage.
  • a recess R is provided on the lower surface of the portion including the bent portion 13 and the flange 14. A certain degree of elasticity can be obtained from the portion provided with the recess R, and impact resistance when an impact is applied to the flange 14 or the like can be obtained.
  • the inner surface of the recess 14C is tilted in the vertical direction, extends diagonally upward from the lower surface 14B toward the inside in the radial direction, and reaches the outer peripheral surface 13B of the bent portion 13, thereby reaching the bent portion 13 side of the flange 14.
  • the thickness of the edge portion (inner peripheral edge portion) of the is gradually reduced toward the bent portion 13. If the inner surface of the recess 14C is angular (when the inner surface of the recess 14C is composed of a surface extending in the vertical direction and a horizontal plane), the cooling rate of the flange 14 becomes uneven depending on the location, and the flange 14 is formed during molding.
  • the upper surface 14A of the flange 14 may have a sink mark, or the flange 14 may warp.
  • the cooling rate of the flange 14 is constant regardless of the location. It is possible to prevent the sink marks and warpage from occurring.
  • the thickness of the flange 14 may be the same as that of the bent portion 13. Further, as shown in FIG. 10, the recess 14C may be omitted, and the lower surface 14B of the flange 14 may be inclined and connected to the outer peripheral surface 13B of the bent portion 13.
  • the shape of the second mold 120 is changed according to the shape of the structure. For example, when the configuration as shown in FIG. 10 is adopted, the upper surface 121A of the cylindrical member 121 is inclined so that the inner peripheral side end portion of the upper surface 121A is connected to the apex portion of the upper surface 122AA of the upper end portion 122A (cylindrical member 121).
  • the shape of the upper end of the cylindrical member 121 is changed so that the upper end of the cylinder member 121 rides on the upper end 122A).
  • the cavity 122 is formed of a relatively soft material such as aluminum so that the inner surface of the recess can be easily processed into a desired shape, while the cylindrical member 121 is with the cutter 130. Since the sheet material S is cut by cooperation, it is formed of a relatively hard material (for example, a steel material) like the cutter 130. Therefore, it is generally difficult to process the shape of the upper end portion of the cylindrical member 121 as described above (because the cylindrical member 121 is made of a hard material).
  • the shape of the above-described embodiment is superior to the shape of FIG. 10 in terms of ease of processing of the second mold 120 and the like.
  • the body portion 11 of the resin container 10 is not limited to a cylindrical shape, but may be a wide tubular shape.
  • the tubular shape includes not only a cylindrical shape but also a circularly sliced cross section having a polygonal shape (square shape, hexagonal shape), an elliptical shape, or the like.
  • the above shapes of the first mold 110, the second mold 120, the cutter 130, and the like are also changed according to the shape of the resin container 10.
  • the cylindrical portion of the first mold 110, the second mold 120, the cutter 130, and the like may have a tubular shape that matches the shape of the resin container 10.
  • the flange 14 may be inclined so that the outer side is located upward.
  • the lower surface 111 of the first mold 110 and the upper surface 121A of the second mold 120 may be inclined so that the outer peripheral side is located above the inner peripheral side (the shape may be formed in a mortar shape).
  • the second annular portion S2 when the second annular portion S2 is sandwiched between the first and second surface M12 and the second and second surface M22, all of the first and second surface M12 may enter the second mold 120. At least a part of the first and second surface M12 may enter the second mold 120.
  • the sheet material S may be cut in advance into a shape corresponding to the resin container 10 and then sandwiched between the first mold 110 and the second mold 120.
  • the upper limit of (the range of the thickness of) may be any of “1", “0.9”, “0.8”, and “0.7”, and the lower limit is “0.8” and "0. It may be any one of "7", "0.6” and "0.5".
  • the range of the thickness T2 (or the range of the thickness of the thick portion) may be 0.57 to 0.715.
  • a mold other than the first mold 110 and the second mold 120 may be used, and even in such a case (for example, as described above, the first and second surfaces M12 have a wall thickness in the second annular portion S2.
  • the thickness of the portion P should be uniform or close to uniform (for example, the upper limit should be any one of "1", “0.9”, and “0.8") without pressing the portion to be the portion 11B from the inside.
  • the lower limit is set to either "0.7” or "0.8") to prevent the warp.

Abstract

A second annular portion of a sheet material is held between a first-second surface (M12) including a first curved surface (112A) and a second curved surface (112B) at a lower end (110A) of a first mold and a second-second surface (M22) including a part (portion corresponding to an outer peripheral surface (13B) of a bending part (13)) of an upper surface (122AA) and an inner peripheral surface (122AB) at an upper end (120A) of a second mold. These surfaces correspond to a thick part (11B) and the bending part (13). The second annular portion is held between the first-second surface (M12) and the second-second surface (M22), cooled by contacting the first-second surface (M12) and the second-second surface (M22), and finally molded into the thick part (11B) and the bending part (13).

Description

樹脂製容器の製造方法、樹脂製容器の製造装置、及び、樹脂製容器Resin container manufacturing method, resin container manufacturing equipment, and resin container
　本発明は、樹脂製容器の製造方法、樹脂製容器の製造装置、及び、樹脂製容器に関する。 The present invention relates to a method for manufacturing a resin container, an apparatus for manufacturing a resin container, and a resin container.
　透明な樹脂製コップ等の樹脂製容器には、その上端部にフランジを有するものがある（例えば、特許文献１）。このような樹脂製容器は、圧空・真空成形（圧空成型と真空成形とのうちの少なくとも一方を行う成形）により製造される。具体的に、熱可塑性樹脂製のシート材を加熱し、加熱された当該シート材のうちフランジとなる環状部分を一対の金型により挟み込み、その後、圧空・真空成形を行うことで、樹脂製容器（カップ状容器）が製造される。 Some resin containers such as transparent resin cups have a flange at the upper end thereof (for example, Patent Document 1). Such a resin container is manufactured by air pressure / vacuum forming (molding in which at least one of pressure air forming and vacuum forming is performed). Specifically, a resin container is made by heating a sheet material made of a thermoplastic resin, sandwiching an annular portion of the heated sheet material to be a flange with a pair of dies, and then performing pressure air / vacuum forming. (Cup-shaped container) is manufactured.
特開昭６３－１９１７７６号公報Japanese Unexamined Patent Publication No. 63-191776
　上記圧空・真空成形による樹脂製容器の製造では、一対の金型により、フランジが形成される環状部分のみが挟み込まれ、その後圧空・真空成形が行われる。この場合、圧空・真空成形後の冷却による胴部の上端部（フランジ近傍部分）の収縮により、当該胴部の上端部が例えば内周側に反ってしまうことがある。 In the production of a resin container by the above-mentioned compressed air / vacuum forming, only the annular portion in which the flange is formed is sandwiched by a pair of dies, and then the compressed air / vacuum forming is performed. In this case, the upper end of the body may warp, for example, to the inner peripheral side due to shrinkage of the upper end (near the flange) of the body due to cooling after compressed air / vacuum forming.
　本発明は、樹脂製容器の胴部の上端部の反りを防止することを課題とする。 An object of the present invention is to prevent warping of the upper end portion of the body portion of a resin container.
　本発明の第１の観点に係る樹脂製容器の製造方法は、
　筒状の胴部と、前記胴部の下側開口を閉口する底と、前記胴部の上端から外側に屈曲した屈曲部と、当該屈曲部から外側に張り出したフランジと、を有する樹脂製容器の製造方法であって、
　加熱された熱可塑性樹脂製のシート材のうち、前記フランジに成形される第１環状部分と、前記胴部の前記上端を含む上端部及び前記屈曲部に成形される第２環状部分とを、前記シート材の上側に位置する第１金型と、前記シート材の下側に位置する第２金型とにより上下方向から挟み込む第１ステップと、
　前記第１金型と前記第２金型とにより前記第１環状部分及び前記第２環状部分が挟み込まれた前記シート材に対して圧空成形と真空成形とのうちの少なくとも一方を行う第２ステップと、を有し、
　前記第１金型は、前記フランジに対応した第１－１面と、前記上端部及び前記屈曲部に対応した第１－２面と、を備え、
　前記第２金型は、前記フランジに対応した第２－１面と、前記上端部及び前記屈曲部に対応した第２－２面と、を備え、
　前記第１金型と前記第２金型とにより前記第１環状部分及び前記第２環状部分が挟み込まれた場合に、前記第１－２面は、その少なくとも一部が前記第２金型内に入り込んで前記第２－２面と対向し、
　前記第１環状部分は、前記第１－１面と前記第２－１面とにより挟み込まれ冷却されることで前記フランジに成形され、
　前記第２環状部分は、前記第１－２面と前記第２－２面とにより挟み込まれ冷却されることで前記上端部及び前記屈曲部に成形される。 The method for manufacturing a resin container according to the first aspect of the present invention is as follows.
A resin container having a tubular body, a bottom that closes the lower opening of the body, a bent portion that bends outward from the upper end of the body, and a flange that projects outward from the bent portion. It is a manufacturing method of
Among the heated thermoplastic resin sheet materials, a first annular portion formed on the flange, an upper end portion including the upper end of the body portion, and a second annular portion formed on the bent portion are provided. A first step of sandwiching the sheet material from above and below by a first mold located on the upper side of the sheet material and a second mold located on the lower side of the sheet material.
A second step of performing at least one of pressure forming and vacuum forming on the sheet material in which the first annular portion and the second annular portion are sandwiched between the first mold and the second mold. And have
The first mold includes a 1-1 surface corresponding to the flange and a 1-2 surface corresponding to the upper end portion and the bent portion.
The second mold includes a 2-1 surface corresponding to the flange and a 2-2 surface corresponding to the upper end portion and the bent portion.
When the first annular portion and the second annular portion are sandwiched between the first mold and the second mold, at least a part of the first and second surfaces is inside the second mold. Enter and face the 2-2 surface,
The first annular portion is formed into the flange by being sandwiched between the 1-1 surface and the 2-1 surface and cooled.
The second annular portion is formed into the upper end portion and the bent portion by being sandwiched between the first and second surfaces and the second and second surfaces and cooled.
　本発明の第２の観点に係る樹脂製容器の製造装置は、
　筒状の胴部と、前記胴部の下側開口を閉口する底と、前記胴部の上端から外側に屈曲した屈曲部と、当該屈曲部から外側に張り出したフランジと、を有する樹脂製容器を、圧空成形と真空成形とのうちの少なくとも一方を行うことにより製造する製造装置であって、
　加熱された熱可塑性樹脂製のシート材のうち、前記フランジに成形される第１環状部分と、前記胴部の前記上端を含む上端部及び前記屈曲部に成形される第２環状部分とを、上下方向から挟み込む一対の金型を備え、
　前記一対の金型の一方は前記シート材の上側に位置する第１金型であり、他方は前記シート材の下側に位置する第２金型であり、
　前記第１金型は、前記フランジに対応した第１－１面と、前記上端部及び前記屈曲部に対応した第１－２面と、を備え、
　前記第２金型は、前記フランジに対応した第２－１面と、前記上端部及び前記屈曲部に対応した第２－２面と、を備え、
　前記第１金型と前記第２金型とにより前記第１環状部分及び前記第２環状部分が挟み込まれた場合に、前記第１－２面は、その少なくとも一部が前記第２金型内に入り込んで前記第２－２面と対向し、
　前記第１－１面と前記第２－１面とは、前記第１環状部分を挟み込み冷却することで前記フランジに成形し、
　前記第１－２面と前記第２－２面とは、前記第２環状部分を挟み込み冷却することで前記上端部及び前記屈曲部に成形する。 The resin container manufacturing apparatus according to the second aspect of the present invention is
A resin container having a tubular body, a bottom that closes the lower opening of the body, a bent portion that bends outward from the upper end of the body, and a flange that projects outward from the bent portion. Is a manufacturing apparatus for manufacturing by performing at least one of pressure forming and vacuum forming.
Among the heated thermoplastic resin sheet materials, a first annular portion formed on the flange, an upper end portion including the upper end of the body portion, and a second annular portion formed on the bent portion are provided. Equipped with a pair of molds that are sandwiched from above and below,
One of the pair of molds is a first mold located on the upper side of the sheet material, and the other is a second mold located on the lower side of the sheet material.
The first mold includes a 1-1 surface corresponding to the flange and a 1-2 surface corresponding to the upper end portion and the bent portion.
The second mold includes a 2-1 surface corresponding to the flange and a 2-2 surface corresponding to the upper end portion and the bent portion.
When the first annular portion and the second annular portion are sandwiched between the first mold and the second mold, at least a part of the first and second surfaces is inside the second mold. Enter and face the 2-2 surface,
The 1-1 surface and the 2-1 surface are formed into the flange by sandwiching and cooling the first annular portion.
The first and second surfaces and the second and second surfaces are formed into the upper end portion and the bent portion by sandwiching and cooling the second annular portion.
　本発明の第３の観点に係る樹脂製容器は、
　熱可塑性樹脂で形成された樹脂製容器であって、
　筒状の胴部と、
　前記胴部の下側開口を閉口する底と、
　前記胴部の上端から外側に屈曲した屈曲部と、
　前記屈曲部から外側に張り出したフランジと、を備え、
　前記胴部は、前記上端を含む上端部であって、前記屈曲部の最も厚い部分の厚さを「１」とした場合に「０．５７」～「１」の範囲内の厚みを有する上端部を有する。 The resin container according to the third aspect of the present invention is
A resin container made of thermoplastic resin.
With a tubular body
The bottom that closes the lower opening of the body and
A bent portion bent outward from the upper end of the body portion,
A flange that projects outward from the bent portion is provided.
The body portion is an upper end portion including the upper end portion, and has a thickness in the range of "0.57" to "1" when the thickness of the thickest portion of the bent portion is "1". Has a part.
　本発明によれば、樹脂製容器の胴部の上端部の反りを防止できる。 According to the present invention, it is possible to prevent the upper end of the body of the resin container from warping.
本発明の一実施形態の樹脂製容器の断面の端面図。The end view of the cross section of the resin container of one Embodiment of this invention. 図１の樹脂製容器のフランジ及びその近傍の断面の端面図。FIG. 3 is an end view of a cross section of the flange of the resin container of FIG. 1 and its vicinity. 本発明の一実施形態の樹脂製容器の製造装置の断面の端面図。The end view of the cross section of the manufacturing apparatus of the resin container of one Embodiment of this invention. 図３の製造装置における、シート材を挟み込む部分の断面の端面図。FIG. 3 is an end view of a cross section of a portion sandwiching a sheet material in the manufacturing apparatus of FIG. 図３の製造装置の第１金型と第２金型とがシート材を挟み込んだときの製造装置及びシート材の断面の端面図。FIG. 3 is an end view of a cross section of the manufacturing apparatus and the sheet material when the first mold and the second mold of the manufacturing apparatus of FIG. 3 sandwich the sheet material. 図５の状態からブロー成形を行ったあとの端面図。The end view after blow molding from the state of FIG. 図６の状態からシート材のカットを行ったあとの端面図。The end view after cutting the sheet material from the state of FIG. 図７の製造装置における、シート材を挟み込んだ部分の断面の端面図。FIG. 7 is an end view of a cross section of a portion sandwiching a sheet material in the manufacturing apparatus of FIG. 7. 参考例を説明するための端面図。An end view for explaining a reference example. 変形例に係る樹脂製容器のフランジ及びその近傍の断面の端面図。The end view of the flange of the resin container which concerns on the modification and the cross section in the vicinity thereof.
　以下、図面を参照しながら、本発明の実施形態に係る樹脂製容器の製造方法、樹脂製容器の製造装置１００、及び、当該製造方法及び製造装置１００により製造される樹脂製容器１０を説明する。 Hereinafter, with reference to the drawings, a method for manufacturing a resin container, a resin container manufacturing apparatus 100, and a resin container 10 manufactured by the manufacturing method and the manufacturing apparatus 100 according to the embodiment of the present invention will be described. ..
（樹脂製容器１０）
　まず、前記製造方法及び製造装置１００により製造される樹脂製容器１０を図１及び２を参照して説明する。樹脂製容器１０は、熱可塑性樹脂製の透明なコップである。樹脂製容器１０は、円筒状の胴部１１と、胴部１１の下側開口を閉口している底１２と、胴部１１の上端から径方向外側に屈曲して延びている屈曲部１３と、屈曲部１３から外側に張り出したフランジ１４と、を備える。なお、以下の説明での断面は、樹脂製容器１０を、その中心軸（ここでは、底１２の中心を通り、上下方向に沿って延びた軸）を含む平面（上下方向及び任意の向きの水平方向に沿って延びた面）で切ったときの切断面をいう。樹脂製容器１０の断面は、前記水平方向の向き（上方から見たときの前記平面が延びている方向）によらず同形状である。 (Resin container 10)
First, the resin container 10 manufactured by the manufacturing method and the manufacturing apparatus 100 will be described with reference to FIGS. 1 and 2. The resin container 10 is a transparent cup made of thermoplastic resin. The resin container 10 includes a cylindrical body portion 11, a bottom 12 that closes the lower opening of the body portion 11, and a bent portion 13 that bends and extends radially outward from the upper end of the body portion 11. A flange 14 projecting outward from the bent portion 13 is provided. In the cross section described below, the cross section of the resin container 10 is a plane (vertical direction and arbitrary orientation) including the central axis thereof (here, an axis extending along the vertical direction through the center of the bottom 12). The cut surface when cut along the horizontal direction). The cross section of the resin container 10 has the same shape regardless of the horizontal direction (the direction in which the plane extends when viewed from above).
　胴部１１は、簿肉部１１Ａと、簿肉部１１Ａから上方に延び、簿肉部１１Ａよりも肉厚の肉厚部１１Ｂ（上端部）と、を備える。 The body portion 11 includes a book meat portion 11A and a wall thickness portion 11B (upper end portion) that extends upward from the book meat portion 11A and is thicker than the book meat portion 11A.
　簿肉部１１Ａは、胴部１１のうちの、図２における一点鎖線Ａよりも下側部分である。簿肉部１１Ａは、上方に向かって広がった円筒形状である。簿肉部１１Ａの上端部は、上方に向かって徐々に肉厚となり、肉厚部１１Ｂと繋がっている。簿肉部１１Ａの下端は、底１２と繋がっている。簿肉部１１Ａは、肉厚部１１Ｂの下端から下方に延びている。 The book meat portion 11A is a portion of the body portion 11 below the alternate long and short dash line A in FIG. The book meat portion 11A has a cylindrical shape that extends upward. The upper end of the booklet portion 11A gradually becomes thicker upward and is connected to the wall thickness portion 11B. The lower end of the book meat portion 11A is connected to the bottom 12. The booklet portion 11A extends downward from the lower end of the wall thickness portion 11B.
　肉厚部１１Ｂは、図２における一点鎖線Ａと一点鎖線Ｂとの間の部分であり、簿肉部１１Ａよりも厚く形成されている。肉厚部１１Ｂは、円筒形状である。肉厚部１１Ｂの内周面１１ＢＡの直径（内径）、肉厚部１１Ｂの外周面１１ＢＢの直径（外径）、及び、肉厚部１１Ｂの厚さは、上下方向において均一（図２等の断面で見て均一）である。なお、肉厚部１１Ｂの上端は、胴部１１の上端（図２における一点鎖線Ｂに沿って切った面）でもある。つまり、肉厚部１１Ｂは、胴部１１の上端を含み、当該上端から下方に延びた形状である。当該形状の他の例として、肉厚部１１Ｂは、上方に向かって広がった円筒形状であってもよい。肉厚部１１Ｂの厚さは、略均一（均一を含む）であるとよい。略均一とは、例えば、最も厚い部分の厚みを「１」とした場合の、最も薄い部分との厚みが「１」～「０．９」（「０．８」としてもよい）の範囲内にあることをいう（「１」の場合は均一）。肉厚部１１Ｂは、簿肉部１１Ａの中央や下端部よりも肉厚である。肉厚部１１Ｂの厚さは、略均一でなくてもよい。 The wall thickness portion 11B is a portion between the alternate long and short dash line A and the alternate long and short dash line B in FIG. 2, and is formed thicker than the book wall portion 11A. The thick portion 11B has a cylindrical shape. The diameter (inner diameter) of the inner peripheral surface 11BA of the thick portion 11B, the diameter (outer diameter) of the outer peripheral surface 11BB of the thick portion 11B, and the thickness of the thick portion 11B are uniform in the vertical direction (FIG. 2 and the like). Uniform in cross section). The upper end of the thick portion 11B is also the upper end of the body portion 11 (a surface cut along the alternate long and short dash line B in FIG. 2). That is, the thick portion 11B includes the upper end of the body portion 11 and has a shape extending downward from the upper end. As another example of this shape, the thick portion 11B may have a cylindrical shape that extends upward. The thickness of the wall thickness portion 11B is preferably substantially uniform (including uniform). The term “substantially uniform” means, for example, that when the thickness of the thickest part is “1”, the thickness of the thinnest part is within the range of “1” to “0.9” (may be “0.8”). (In the case of "1", it is uniform). The wall thickness portion 11B is thicker than the center and lower end portions of the book wall portion 11A. The thickness of the wall thickness portion 11B does not have to be substantially uniform.
　屈曲部１３は、図２における一点鎖線Ｂと一点鎖線Ｃとの間の部分である。屈曲部１３は、上方から見て円環状であり、胴部１１の上端から径方向外側（図２では、右方向）に屈曲した形状である。具体的に、屈曲部１３は、図２のように、断面において、その上部が径方向外側に向くように屈曲している。換言すると、屈曲部１３の断面における幅方向中央を通る線は、当該線のフランジ１４側端部が径方向外側に向かうように、屈曲している。屈曲部１３の内周面（上面）１３Ａ及び外周面（下面）１３Ｂは、各断面が円弧状になっている。内周面１３Ａは、肉厚部１１Ｂの内周面１１ＢＡと、フランジ１４の上面１４Ａと、に繋がっている。外周面１３Ｂは、肉厚部１１Ｂの外周面１１ＢＢと、フランジ１４の凹部１４Ｃの内面と、に繋がっている。 The bent portion 13 is a portion between the alternate long and short dash line B and the alternate long and short dash line C in FIG. The bent portion 13 has an annular shape when viewed from above, and has a shape of being bent radially outward (to the right in FIG. 2) from the upper end of the body portion 11. Specifically, as shown in FIG. 2, the bent portion 13 is bent so that its upper portion faces outward in the radial direction in the cross section. In other words, the line passing through the center in the width direction in the cross section of the bent portion 13 is bent so that the end portion on the flange 14 side of the line is directed outward in the radial direction. The inner peripheral surface (upper surface) 13A and the outer peripheral surface (lower surface) 13B of the bent portion 13 have an arcuate cross section. The inner peripheral surface 13A is connected to the inner peripheral surface 11BA of the thick portion 11B and the upper surface 14A of the flange 14. The outer peripheral surface 13B is connected to the outer peripheral surface 11BB of the thick portion 11B and the inner surface of the recess 14C of the flange 14.
　フランジ１４は、屈曲部１３の外周（一点鎖線Ｃの部分）から、胴部１１の径方向外側に向けて水平方向に張り出している。フランジ１４は、上方又は下方から見たときに円環状に形成されている。フランジ１４の上面１４Ａは、屈曲部１３の内周面１３Ａに繋がっている。上面１４Ａは、上下方向に直交する水平面である。フランジ１４は、下面１４Ｂと、凹部１４Ｃとを有する。凹部１４Ｃは、フランジ１４における屈曲部１３側の縁部（内周側の縁部）に設けられており、円環状の下面１４Ｂの内側に位置している。凹部１４Ｃは、上向きに凹んだ形状で形成されている。凹部１４Ｃの内面は、上下方向に対して傾いており、下面１４Ｂから径方向内側に向かう斜め上方に延びて屈曲部１３の外周面１３Ｂに達している。凹部１４Ｃの内面は、断面において湾曲している。凹部１４Ｃ及び外周面１３Ｂは、樹脂製容器１０の上端部の下面に設けられた１つの凹部Ｒを形成している。下面１４Ｂは、上下方向に直交する水平面であり、上面１４Ａと平行である。上面１４Ａ及び下面１４Ｂのうちの少なくとも一方は、径方向外側に向けて傾斜してもよい。フランジ１４は、凹部１４Ｃを備える分、屈曲部１３や肉厚部１１Ｂよりも厚く形成されている。 The flange 14 projects horizontally from the outer circumference of the bent portion 13 (the portion of the alternate long and short dash line C) toward the outside in the radial direction of the body portion 11. The flange 14 is formed in an annular shape when viewed from above or below. The upper surface 14A of the flange 14 is connected to the inner peripheral surface 13A of the bent portion 13. The upper surface 14A is a horizontal plane orthogonal to the vertical direction. The flange 14 has a lower surface 14B and a recess 14C. The recess 14C is provided at the edge of the flange 14 on the bent portion 13 side (the edge on the inner peripheral side), and is located inside the annular lower surface 14B. The recess 14C is formed in an upwardly recessed shape. The inner surface of the recess 14C is inclined in the vertical direction, extends diagonally upward from the lower surface 14B toward the inside in the radial direction, and reaches the outer peripheral surface 13B of the bent portion 13. The inner surface of the recess 14C is curved in cross section. The recess 14C and the outer peripheral surface 13B form one recess R provided on the lower surface of the upper end portion of the resin container 10. The lower surface 14B is a horizontal plane orthogonal to the vertical direction and is parallel to the upper surface 14A. At least one of the upper surface 14A and the lower surface 14B may be inclined outward in the radial direction. The flange 14 is formed to be thicker than the bent portion 13 and the thick portion 11B because the recess 14C is provided.
　屈曲部１３と肉厚部１１Ｂとからなる部分Ｐ（一点鎖線Ａから一点鎖線Ｃまでの部分）における最も厚い第１部分の厚さＴ１を「１」とした場合の当該部分Ｐにおける最も薄い第２部分の厚さＴ２は「０．５７」～「１」（Ｔ１：Ｔ２＝１：（０．５７～１））の範囲内である。ここでは、厚さＴ１は、屈曲部１３とフランジ１４との境界部分の厚さＬ１であり、厚さＴ２は、例えば、肉厚部１１Ｂの厚さＬ２である。屈曲部１３は、断面におけるフランジ１４側端部（一点鎖線Ｃ）から肉厚部１１Ｂ側端部（一点鎖線Ｂ）に向けて徐々に薄くなっている。 The thinnest second portion in the portion P when the thickness T1 of the thickest first portion in the portion P (the portion from the alternate long and short dash line A to the alternate long and short dash line C) including the bent portion 13 and the thick portion 11B is set to "1". The thickness T2 of the two portions is in the range of "0.57" to "1" (T1: T2 = 1: (0.57 to 1)). Here, the thickness T1 is the thickness L1 of the boundary portion between the bent portion 13 and the flange 14, and the thickness T2 is, for example, the thickness L2 of the thick portion 11B. The bent portion 13 gradually becomes thinner from the flange 14 side end portion (dotted chain line C) in the cross section toward the wall thickness portion 11B side end portion (dotted chain line B).
　「厚さ」は、面的な広がりをもつ物体の、その広がりとは垂直な方向の長さであればよく、例えば、部分Ｐの厚さは、図２における、肉厚部１１Ｂの内周面１１ＢＡ及び屈曲部１３の内周面１３Ａの断面の線（一点鎖線Ａから一点鎖線Ｃに至る線）と、肉厚部１１Ｂの外周面１１ＢＢ及び屈曲部１３の外周面１３Ｂの断面の線（一点鎖線Ａから一点鎖線Ｃに至る線）と、の中間を通る中間線に直交する方向の長さである。 The "thickness" may be the length of an object having a planar spread in a direction perpendicular to the spread. For example, the thickness of the portion P is the inner circumference of the thick portion 11B in FIG. The cross-sectional line of the inner peripheral surface 13A of the surface 11BA and the bent portion 13 (the line from the alternate long and short dash line A to the alternate long and short dash line C) and the cross-sectional line of the outer peripheral surface 11BB of the thick portion 11B and the outer peripheral surface 13B of the bent portion 13 ( It is the length in the direction orthogonal to the intermediate line passing through the middle of the alternate long and short dash line A).
（樹脂製容器の製造装置１００の構成）
　製造装置１００は、図３及び図４を示すように、第１金型１１０と、第２金型１２０と、カッタ１３０と、を備える。製造装置１００は、熱可塑性樹脂製のシート材Ｓを成形して、樹脂製容器１０を製造するための装置である。なお、以下での断面は、製造装置１００及び樹脂製容器１０を、その中心軸を含む平面（上下方向及び任意の向きの水平方向に沿って延びた面）で切ったときの切断面をいう。製造装置１００の第１金型１１０、第２金型１２０、及び、カッタ１３０の各断面は、前記水平方向の向き（上方から見たときの前記平面が延びている方向）によらず同形状である。 (Structure of the resin container manufacturing apparatus 100)
As shown in FIGS. 3 and 4, the manufacturing apparatus 100 includes a first mold 110, a second mold 120, and a cutter 130. The manufacturing apparatus 100 is an apparatus for molding a sheet material S made of a thermoplastic resin to manufacture a resin container 10. The cross section below refers to a cut surface when the manufacturing apparatus 100 and the resin container 10 are cut in a plane including the central axis thereof (a surface extending in the vertical direction and the horizontal direction in an arbitrary direction). .. The cross sections of the first mold 110, the second mold 120, and the cutter 130 of the manufacturing apparatus 100 have the same shape regardless of the horizontal orientation (the direction in which the plane extends when viewed from above). Is.
　第１金型１１０は、内部が空洞となっている略円筒形状である。第１金型１１０は、その下端部１１０Ａに、上下方向に直交する面である下面１１１と、下面１１１よりも下方に突出した凸部１１２と、を備える（図４参照）。下端部１１０Ａは、円筒形状の筒状部でもある。下面１１１は、図４における一点鎖線Ｆの右側部分の水平面である。下面１１１及び凸部１１２は、下方から見た場合に円環状に形成されている。下面１１１と凸部１１２とは、径方向に沿って連続しており、凸部１１２の方が径方向内側に位置している。凸部１１２は、下面１１１と繋がる第１曲面１１２Ａと、当該第１曲面１１２Ａに繋がり、断面で見たときに略上下方向（上下方向に対して傾きがある）に延びる第２曲面１１２Ｂと、を有する。第１曲面１１２Ａは、図４における一点鎖線ＥとＦとの間の面である。第１曲面１１２Ａは、断面で見たときに湾曲している。第２曲面１１２Ｂは、図４における一点鎖線ＤとＥとの間の面である。第２曲面１１２Ｂは、円筒の外周面形状を有する。 The first mold 110 has a substantially cylindrical shape with a hollow inside. The first mold 110 includes a lower end portion 110A thereof, a lower surface 111 which is a plane orthogonal to the vertical direction, and a convex portion 112 projecting downward from the lower surface 111 (see FIG. 4). The lower end portion 110A is also a cylindrical portion having a cylindrical shape. The lower surface 111 is a horizontal plane on the right side of the alternate long and short dash line F in FIG. The lower surface 111 and the convex portion 112 are formed in an annular shape when viewed from below. The lower surface 111 and the convex portion 112 are continuous along the radial direction, and the convex portion 112 is located inward in the radial direction. The convex portion 112 includes a first curved surface 112A connected to the lower surface 111, and a second curved surface 112B connected to the first curved surface 112A and extending substantially in the vertical direction (inclined in the vertical direction) when viewed in cross section. Has. The first curved surface 112A is a surface between the alternate long and short dash lines E and F in FIG. The first curved surface 112A is curved when viewed in cross section. The second curved surface 112B is a surface between the alternate long and short dash lines D and E in FIG. The second curved surface 112B has a cylindrical outer peripheral surface shape.
　第１金型１１０の下面１１１は、フランジ１４の上面１４Ａに対応しており、当該上面１４Ａを成形するための形状を有する。第１曲面１１２Ａは、屈曲部１３の内周面１３Ａに対応しており、当該内周面１３Ａを成形するための形状を有する。第２曲面１１２Ｂは、胴部１１の肉厚部１１Ｂの内周面１１ＢＡに対応しており、当該内周面１１ＢＡを成形するための形状を有する。 The lower surface 111 of the first mold 110 corresponds to the upper surface 14A of the flange 14, and has a shape for molding the upper surface 14A. The first curved surface 112A corresponds to the inner peripheral surface 13A of the bent portion 13, and has a shape for forming the inner peripheral surface 13A. The second curved surface 112B corresponds to the inner peripheral surface 11BA of the thick portion 11B of the body portion 11, and has a shape for forming the inner peripheral surface 11BA.
　第２金型１２０は、円筒部材１２１と、キャビティ１２２と、を備える。円筒部材１２１は、円筒形状を有する。円筒部材１２１の上面１２１Ａは、上下方向に直交する水平面であり、第１金型１１０の下面１１１と平行かつ対向している。キャビティ１２２は、円筒部材１２１の内部に嵌め込まれている。キャビティ１２２は、円柱形状の内部を上からくりぬいた凹形状を有し、当該凹形状の内面は、樹脂製容器１０の底１２及び胴部１１に対応しており、底１２及び胴部１１を形成するための形状を有する。キャビティ１２２の上端部１２２Ａは、円筒形状を有し、一部（上端）が円筒部材１２１の上面１２１Ａよりも上方に突出している。上端部１２２Ａは、第１上面１２２ＡＡＡ及び第２上面１２２ＡＡＢからなる上面１２２ＡＡを有する。上面１２２ＡＡは、断面で見たときに上に凸に湾曲している。第１上面１２２ＡＡＡは、上面１２２ＡＡのうち、頂点部分（一点鎖線Ｆが通る部分）よりも径方向外周側の面である。第２上面１２２ＡＡＢは、上面１２２ＡＡのうち、頂点部分よりも径方向内周側の面である。上面１２２ＡＡは、円筒部材１２１の上面１２１Ａに繋がっている。上端部１２２Ａの内周面１２２ＡＢは、上下方向に沿って延びた円筒の外周面形状である。 The second mold 120 includes a cylindrical member 121 and a cavity 122. The cylindrical member 121 has a cylindrical shape. The upper surface 121A of the cylindrical member 121 is a horizontal plane orthogonal to the vertical direction, and is parallel to and faces the lower surface 111 of the first mold 110. The cavity 122 is fitted inside the cylindrical member 121. The cavity 122 has a concave shape obtained by hollowing out the inside of the cylindrical shape from above, and the inner surface of the concave shape corresponds to the bottom 12 and the body 11 of the resin container 10, and the bottom 12 and the body 11 are formed. It has a shape to form. The upper end portion 122A of the cavity 122 has a cylindrical shape, and a part (upper end) of the cavity 122 protrudes upward from the upper surface 121A of the cylindrical member 121. The upper end portion 122A has an upper surface 122AA composed of a first upper surface 122AAA and a second upper surface 122AAB. The upper surface 122AA is convexly curved upward when viewed in cross section. The first upper surface 122AAA is a surface of the upper surface 122AA on the outer peripheral side in the radial direction from the apex portion (the portion through which the alternate long and short dash line F passes). The second upper surface 122AAB is a surface of the upper surface 122AA on the inner peripheral side in the radial direction with respect to the apex portion. The upper surface 122AA is connected to the upper surface 121A of the cylindrical member 121. The inner peripheral surface 122AB of the upper end portion 122A has an outer peripheral surface shape of a cylinder extending in the vertical direction.
　第２金型１２０の上面１２１Ａは、フランジ１４の下面１４Ｂに対応しており、当該下面１４Ｂを成形するための形状を有する。上端部１２２Ａの上面１２２ＡＡは、凹部Ｒ（屈曲部１３の外周面１３Ｂ及びフランジ１４の凹部１４Ｃ）に対応しており、当該凹部Ｒを成形するための形状を有する。上面１２２ＡＡのうちの第１上面１２２ＡＡＡは、凹部Ｒのうちの凹部１４Ｃに対応しており、当該凹部１４Ｃを成形するための形状を有する。上面１２２ＡＡのうちの第２上面１２２ＡＡＢは、凹部Ｒのうちの外周面１３Ｂに対応しており、当該外周面１３Ｂを成形するための形状を有する。内周面１２２ＡＢは、胴部１１の肉厚部１１Ｂの外周面１１ＢＢに対応しており、当該外周面１１ＢＢを成形するための形状を有する。 The upper surface 121A of the second mold 120 corresponds to the lower surface 14B of the flange 14, and has a shape for molding the lower surface 14B. The upper surface 122AA of the upper end portion 122A corresponds to the concave portion R (the outer peripheral surface 13B of the bent portion 13 and the concave portion 14C of the flange 14), and has a shape for forming the concave portion R. The first upper surface 122AAA of the upper surface 122AA corresponds to the recess 14C of the recess R, and has a shape for forming the recess 14C. The second upper surface 122AAB of the upper surface 122AA corresponds to the outer peripheral surface 13B of the recess R, and has a shape for forming the outer peripheral surface 13B. The inner peripheral surface 122AB corresponds to the outer peripheral surface 11BB of the thick portion 11B of the body portion 11, and has a shape for molding the outer peripheral surface 11BB.
　円筒部材１２１の上端部と、キャビティ１２２の上端部１２２Ａとは、第２金型１２０における円筒形状の筒状部である上端部１２０Ａを構成している。キャビティ１２２の底には、キャビティ１２２の内の空気を外部に排気するための排気口１２２Ｄが設けられている。 The upper end portion of the cylindrical member 121 and the upper end portion 122A of the cavity 122 form the upper end portion 120A which is a cylindrical cylindrical portion of the second mold 120. At the bottom of the cavity 122, an exhaust port 122D for exhausting the air inside the cavity 122 to the outside is provided.
　カッタ１３０は、円筒形状であり、第１金型１１０の外周面及び円筒部材１２１の外周面を上下方向に摺動する。 The cutter 130 has a cylindrical shape and slides in the vertical direction on the outer peripheral surface of the first mold 110 and the outer peripheral surface of the cylindrical member 121.
　製造装置１００は、その他、キャビティ１２２内に空気を供給する供給手段と、第１金型１１０、第２金型１２０、及び、カッタ１３０等を駆動する駆動機構と、製造装置１００の動作を制御する制御部と、その他必要な装置等と、を備える。 The manufacturing apparatus 100 also controls the operation of the manufacturing apparatus 100, the supply means for supplying air into the cavity 122, the drive mechanism for driving the first mold 110, the second mold 120, the cutter 130, and the like. It is provided with a control unit for the operation and other necessary devices.
（樹脂製容器の製造装置１００の動作、樹脂製容器の製造方法）
　シート材Ｓは、原反ロール等から繰り出され、図示しない加熱装置により加熱される。例えば、ヒータ等により上下方向からシート材Ｓを加熱し、シート材Ｓを当該ガラス転移温度以上に加熱する。シート材Ｓは、熱可塑性樹脂を材料としている。熱可塑性樹脂としては、例えばポリエステル系樹脂（ＰＥＴ（Polyethylene terephthalate）など）、ポリオレフィン系樹脂（ＰＰ（polypropylene）、ＰＥ（polyethylene）など）、ポリスチレン系樹脂、ポリアミド系樹脂及びポリカーボネート系樹脂を挙げることができる。 (Operation of the resin container manufacturing apparatus 100, a method for manufacturing a resin container)
The sheet material S is unwound from the raw fabric roll or the like and is heated by a heating device (not shown). For example, the sheet material S is heated from above and below with a heater or the like, and the sheet material S is heated to a temperature equal to or higher than the glass transition temperature. The sheet material S is made of a thermoplastic resin. Examples of the thermoplastic resin include polyester resins (PET (Polyethylene terephthalate), etc.), polyolefin resins (PP (polypropylene), PE (polyethylene), etc.), polystyrene resins, polyamide resins, and polycarbonate resins. it can.
　上記で加熱されたシート材Ｓは、製造装置１００の第１金型１１０と第２金型１２０との間に繰り出される（図３）。その後、製造装置１００の制御部は、製造装置１００の駆動機構を制御して、第１金型１１０を下方に移動させ、第２金型１２０を上方に移動させ、シート材Ｓを、第１金型１１０の下端部１１０Ａと第２金型１２０の上端部１２０Ａとにより挟み込む（図５）。シート材Ｓの、下端部１１０Ａと上端部１２０Ａとにより挟み込まれる部分は、その後にフランジ１４となる円環状の第１環状部分Ｓ１と、その後に胴部１１の肉厚部１１Ｂ及び屈曲部１３となる円環状の第２環状部分Ｓ２である。第２環状部分Ｓ２は、第１環状部分Ｓ１の内周側に位置し、径方向に沿って両者は連続している。前記挟み込みにより、樹脂製容器１０の肉厚部１１Ｂ、屈曲部１３、及び、フランジ１４が成形される。当該成形についての詳細は後述する。 The sheet material S heated above is fed out between the first mold 110 and the second mold 120 of the manufacturing apparatus 100 (FIG. 3). After that, the control unit of the manufacturing apparatus 100 controls the drive mechanism of the manufacturing apparatus 100 to move the first mold 110 downward, move the second mold 120 upward, and move the sheet material S to the first. It is sandwiched between the lower end 110A of the mold 110 and the upper end 120A of the second mold 120 (FIG. 5). The portion of the sheet material S that is sandwiched between the lower end portion 110A and the upper end portion 120A is an annular first annular portion S1 that subsequently becomes a flange 14, followed by a thick portion 11B and a bent portion 13 of the body portion 11. It is the second annular portion S2 of the annular shape. The second annular portion S2 is located on the inner peripheral side of the first annular portion S1, and both are continuous along the radial direction. By the sandwiching, the thick portion 11B, the bent portion 13, and the flange 14 of the resin container 10 are formed. Details of the molding will be described later.
　シート材Ｓを、第１金型１１０の下端部１１０Ａと第２金型１２０の上端部１２０Ａとにより挟み込んだあと、製造装置１００の制御部は、前記供給手段を制御して、第２金型１２０の上部開口を介して、空気を供給し、シート材Ｓを変形させ、キャビティ１２２の内面に張り付かせる（図６）。このような空気の供給により、圧空成形が行われる。この圧空成形前に延伸ロッドを用いてシート材Ｓを延伸させてもよい。シート材Ｓとキャビティ１２２の内面との間の空気は、シート材Ｓの変形に伴って排気口１２２Ｄから排気される。なお、シート材Ｓとキャビティ１２２の内面との間の空気を排気ポンプ等により、排気口１２２Ｄから強制的に排気してもよい。この場合、圧空成形とともに真空成形が行われることになる。なお、真空成形のみを行い、シート材Ｓを変形させ、キャビティ１２２の内面に張り付かせてもよい。このように、シート材Ｓに対しては、気体（空気の他、圧縮空気や他の気体であってもよい）を供給する成形である圧空成形と、キャビティ１２２内の気体を排気する成形である真空成形と、のうちの少なくとも一方を行う圧空・真空成形が行われればよい。シート材Ｓのうち、キャビティ１２２の内面に張り付いた部分は、キャビティ１２２の温度により冷却され、これにより、樹脂製容器１０の底１２及び胴部１１の簿肉部１１Ａ、換言すると、肉厚部１１Ｂ、屈曲部１３、及び、フランジ１４以外の残りの部分が形成される。圧空成形及び又は真空成形により、シート材Ｓは伸張するので、底１２及び簿肉部１１Ａは、胴部１１の肉厚部１１Ｂ及びフランジ１４よりも薄くなる。 After the sheet material S is sandwiched between the lower end portion 110A of the first mold 110 and the upper end portion 120A of the second mold 120, the control unit of the manufacturing apparatus 100 controls the supply means to control the second mold. Air is supplied through the upper opening of the 120 to deform the sheet material S and attach it to the inner surface of the cavity 122 (FIG. 6). Compressed air molding is performed by supplying such air. Before this compressed air forming, the sheet material S may be stretched using a stretching rod. The air between the sheet material S and the inner surface of the cavity 122 is exhausted from the exhaust port 122D as the sheet material S is deformed. The air between the sheet material S and the inner surface of the cavity 122 may be forcibly exhausted from the exhaust port 122D by an exhaust pump or the like. In this case, vacuum forming is performed together with compressed air forming. It should be noted that only vacuum forming may be performed to deform the sheet material S and attach it to the inner surface of the cavity 122. In this way, the sheet material S is subjected to vacuum forming, which is a molding for supplying gas (compressed air or other gas may be used in addition to air), and molding for exhausting the gas in the cavity 122. It suffices to perform a certain vacuum forming and a compressed air / vacuum forming that performs at least one of them. The portion of the sheet material S that sticks to the inner surface of the cavity 122 is cooled by the temperature of the cavity 122, whereby the bottom 12 of the resin container 10 and the book meat portion 11A of the body portion 11, in other words, the wall thickness. The remaining portions other than the portion 11B, the bent portion 13, and the flange 14 are formed. Since the sheet material S is stretched by compressed air forming and / or vacuum forming, the bottom 12 and the book meat portion 11A are thinner than the wall thickness portion 11B and the flange 14 of the body portion 11.
　その後、製造装置１００の制御部は、駆動機構を制御し、カッタ１３０を上下方向に動かすことにより、シート材Ｓにおける、第１金型１１０の下端部１１０Ａと第２金型１２０の上端部１２０Ａとにより挟み込まれた部分よりも外側部分をカットする（図７）。これにより、樹脂製容器１０が形成される。その後、製造装置１００の制御部は、第１金型１１０、第２金型１２０、及び、カッタ１３０を初期位置に戻し、樹脂製容器１０が第２金型１２０から取り出される。 After that, the control unit of the manufacturing apparatus 100 controls the drive mechanism and moves the cutter 130 in the vertical direction to move the lower end portion 110A of the first mold 110 and the upper end portion 120A of the second mold 120 in the sheet material S. The outer part is cut from the part sandwiched by and (Fig. 7). As a result, the resin container 10 is formed. After that, the control unit of the manufacturing apparatus 100 returns the first mold 110, the second mold 120, and the cutter 130 to the initial positions, and the resin container 10 is taken out from the second mold 120.
　次に、図２、図４、図８を参照して、肉厚部１１Ｂ、屈曲部１３、及び、フランジ１４の成形について説明する。ここで、図４は、第１金型１１０の下端部１１０Ａと第２金型１２０の上端部１２０Ａとで肉厚部１１Ｂ、屈曲部１３、及び、フランジ１４を形成するときの下端部１１０Ａ及び上端部１２０Ａの断面図であり、図８の樹脂製容器１０を抜いた図面である。 Next, the molding of the thick portion 11B, the bent portion 13, and the flange 14 will be described with reference to FIGS. 2, 4, and 8. Here, FIG. 4 shows a wall thickness portion 11B, a bent portion 13, and a lower end portion 110A when the flange 14 is formed by the lower end portion 110A of the first mold 110 and the upper end portion 120A of the second mold 120. It is sectional drawing of the upper end part 120A, and is the drawing which pulled out the resin container 10 of FIG.
　シート材Ｓの第１環状部分Ｓ１及び第２環状部分Ｓ２（図５等）を、第１金型１１０の下端部１１０Ａと第２金型１２０の上端部１２０Ａとにより挟み込むと、下端部１１０Ａと上端部１２０Ａの各形状に合わせて、第１環状部分Ｓ１及び第２環状部分Ｓ２が変形する。 When the first annular portion S1 and the second annular portion S2 (FIG. 5 and the like) of the sheet material S are sandwiched between the lower end 110A of the first mold 110 and the upper end 120A of the second mold 120, the lower end 110A and the lower end 110A The first annular portion S1 and the second annular portion S2 are deformed according to each shape of the upper end portion 120A.
　具体的に、第１環状部分Ｓ１は、第１金型１１０の下面１１１からなる第１－１面Ｍ１１（図８参照）と、第２金型１２０の上面１２１Ａと第１上面１２２ＡＡＡとからなる第２－１面Ｍ２１（図８参照）と、により挟み込まれる。これらの面は、フランジ１４に対応した形状である。第１環状部分Ｓ１は、第１－１面Ｍ１１と第２－１面Ｍ２１とにより挟み込まれ、さらに、当該第１－１面Ｍ１１と第２－１面Ｍ２１と接触することで冷却され、当該挟み込み及び冷却により最終的にフランジ１４に成形される。 Specifically, the first annular portion S1 is composed of a first surface M11 (see FIG. 8) formed of the lower surface 111 of the first mold 110, an upper surface 121A of the second mold 120, and a first upper surface 122AAA. It is sandwiched by the second surface M21 (see FIG. 8). These surfaces have a shape corresponding to the flange 14. The first annular portion S1 is sandwiched between the 1-1 surface M11 and the 2-1 surface M21, and is further cooled by coming into contact with the 1-1 surface M11 and the 2-1 surface M21. It is finally formed into the flange 14 by sandwiching and cooling.
　第２環状部分Ｓ２は、第１金型１１０の第１曲面１１２Ａ及び第２曲面１１２Ｂからなる第１－２面Ｍ１２と、第２金型１２０の第２上面１２２ＡＡＢ及び内周面１２２ＡＢからなる第２－２面Ｍ２２と、により挟み込まれる。これらの面は、肉厚部１１Ｂ及び屈曲部１３に対応した形状である。第２環状部分Ｓ２は、第１－２面Ｍ１２と第２－２面Ｍ２２とにより挟み込まれ、さらに、当該第１－２面Ｍ１２と第２－２面Ｍ２２と接触することで冷却され、当該挟み込み及び冷却により最終的に肉厚部１１Ｂ及び屈曲部１３に成形される。 The second annular portion S2 is a second surface M12 composed of a first curved surface 112A and a second curved surface 112B of the first mold 110, and a second upper surface 122AAB and an inner peripheral surface 122AB of the second mold 120. It is sandwiched by the 2-2 surface M22. These surfaces have a shape corresponding to the thick portion 11B and the bent portion 13. The second annular portion S2 is sandwiched between the first and second surface M12 and the second and second surface M22, and is further cooled by coming into contact with the first and second surface M12 and the second and second surface M22. It is finally formed into the thick portion 11B and the bent portion 13 by sandwiching and cooling.
　肉厚部１１Ｂ及び屈曲部１３を成形するために、第２環状部分Ｓ２を第１－２面Ｍ１２と第２－２面Ｍ２２とにより挟み込む際、第１－２面Ｍ１２の一部（特に第２曲面１１２Ｂ）が第２金型１２０内に入り込み、第１－２面Ｍ１２と第２－２面Ｍ２２とは、第１－１面Ｍ１１と第２－１面Ｍ２１との対向方向とは異なる方向で対向する。特に、第２曲面１１２Ｂと内周面１２２ＡＢとの対向方向が、第１－１面Ｍ１１と第２－１面Ｍ２１との対向方向と異なる（ここでは、略直交しているが、直交していなくてもよい）。 When the second annular portion S2 is sandwiched between the first and second surface M12 and the second and second surface M22 in order to form the thick portion 11B and the bent portion 13, a part of the first and second surface M12 (particularly the first). The two curved surfaces 112B) enter the second mold 120, and the first and second surface M12 and the second and second surface M22 are different from the opposite directions of the first surface M11 and the second surface M21. Oppose in the direction. In particular, the facing direction between the second curved surface 112B and the inner peripheral surface 122AB is different from the facing direction between the 1-1 surface M11 and the 2-1 surface M21 (here, they are substantially orthogonal, but they are orthogonal to each other). It does not have to be).
　肉厚部１１Ｂ及び屈曲部１３を成形するために、第２環状部分Ｓ２を第１－２面Ｍ１２と第２－２面Ｍ２２とにより挟み込んだとき、第１－２面Ｍ１２と第２－２面Ｍ２２との間隔は、略均一である。当該間隔は、例えば、第１－２面Ｍ１２と第２－２面Ｍ２２とのいずれか（ここでは、第２－２面Ｍ２２）に対する垂線が延びる方向に沿った第１－２面Ｍ１２と第２－２面Ｍ２２との間の長さである。また、当該間隔は、第１－２面Ｍ１２と第２－２面Ｍ２２とに挟まれた空間の厚さと同じと捉えてもよい。「厚さ」の説明は、上記に準じる。 When the second annular portion S2 is sandwiched between the first and second surfaces M12 and the second and second surfaces M22 in order to form the thick portion 11B and the bent portion 13, the first and second surfaces M12 and 2-2 The distance from the surface M22 is substantially uniform. The interval is, for example, the first and second surfaces M12 and the second along the direction in which the perpendicular line extends with respect to either the first or second surface M12 or the second or second surface M22 (here, the second or second surface M22). It is the length between the 2-2 surface M22. Further, the interval may be regarded as the same as the thickness of the space sandwiched between the first and second surfaces M12 and the second and second surfaces M22. The description of "thickness" is as described above.
　上記略均一として、例えば、第１－２面Ｍ１２と第２－２面Ｍ２２との間の最も長い間隔Ｓ１を「１」としたときの最も短い間隔Ｓ２を「０．７」～「１」（Ｓ１：Ｓ２＝１：（０．７～１））の範囲内とするとよい。また、より好ましくは、前記間隔Ｓ２を「０．９」～「１」（Ｓ１：Ｓ２＝１：（０．９～１））とするとよい。 As the above substantially uniform, for example, when the longest interval S1 between the first and second surfaces M12 and the second and second surfaces M22 is "1", the shortest interval S2 is "0.7" to "1". It is preferable that the range is within the range of (S1: S2 = 1: (0.7 to 1)). Further, more preferably, the interval S2 may be set to "0.9" to "1" (S1: S2 = 1: (0.9 to 1)).
　前記の最も長い間隔Ｓ１は、例えば、第１金型１１０の第１曲面１１２Ａと第２曲面１１２Ｂの境界（肉厚部１１Ｂと屈曲部１３との境界に対応する位置）を通る間隔Ｐ１、及び／又は、第１金型１１０の下面１１１と第１曲面１１２Ａの境界（屈曲部１３とフランジ１４との境界に対応する位置）を通る間隔Ｐ２とし、前記の最も短い間隔Ｓ２は、例えば、第１金型１１０の第２曲面１１２Ｂの下端（肉厚部１１Ｂと簿肉部１１Ａとの境界に対応する位置）を通る間隔Ｐ３とする。 The longest interval S1 is, for example, an interval P1 passing through the boundary between the first curved surface 112A and the second curved surface 112B of the first mold 110 (the position corresponding to the boundary between the thick portion 11B and the bent portion 13), and / Or, the interval P2 passing through the boundary between the lower surface 111 of the first mold 110 and the first curved surface 112A (the position corresponding to the boundary between the bent portion 13 and the flange 14) is set, and the shortest interval S2 is, for example, the first. 1 The interval P3 passing through the lower end of the second curved surface 112B of the mold 110 (the position corresponding to the boundary between the thick portion 11B and the booklet portion 11A) is set.
　第１－２面Ｍ１２の第２曲面１１２Ｂと第２－２面Ｍ２２の内周面１２２ＡＢとの間隔は、下方に向かって若干幅広になっている（第２曲面１１２Ｂの断面が、上下方向に対して若干傾いているため）。一方で、肉厚部１１Ｂの厚さは、上下方向において均一である。従って、図８において、肉厚部１１Ｂの内周面１１ＢＡは、下部において、第２曲面１１２Ｂと若干離間している。これは、肉厚部１１Ｂの冷却時の収縮による（なお、条件等によっては、他の部分も適宜収縮する）。当該収縮を考慮して、肉厚部１１Ｂの厚さが均一となるよう、第２曲面１１２Ｂを形成するとよい。なお、第２曲面１１２Ｂと、内周面１２２ＡＢと、を平行としてもよい。 The distance between the second curved surface 112B of the first and second surface M12 and the inner peripheral surface 122AB of the second and second surface M22 is slightly wider downward (the cross section of the second curved surface 112B is in the vertical direction). On the other hand, it is slightly tilted). On the other hand, the thickness of the thick portion 11B is uniform in the vertical direction. Therefore, in FIG. 8, the inner peripheral surface 11BA of the thick portion 11B is slightly separated from the second curved surface 112B at the lower portion. This is due to shrinkage of the thick portion 11B during cooling (note that other portions also shrink appropriately depending on conditions and the like). In consideration of the shrinkage, the second curved surface 112B may be formed so that the thickness of the thick portion 11B becomes uniform. The second curved surface 112B and the inner peripheral surface 122AB may be parallel to each other.
（本実施の形態上の効果等）
　参考例は、図９に示すように、金型６１及び金型６２によりシート材のフランジ５１となる部分のみを挟み込んだあと圧空・真空成形を行って、カップ状の樹脂製容器５０を形成していた。このとき、樹脂製容器５０の胴部の上端部５２は金型６１により冷却され、屈曲部５３は自然冷却されるか、金型６１及び金型６２によりフランジ等を介して間接的に冷却される。このため、屈曲部５３の冷却速度よりも上端部５２の冷却速度の方が速い。さらに、上端部５２の厚みが均一でないため（圧空・真空成形のため、屈曲部５３に繋がる部分はどうしても厚くなる）、上端部５２においても場所によって冷却速度が異なる。そして、ここでは、上端部５２の薄い部分が厚い部分に比べて良く冷えるため、当該薄い部分が他の部分よりも速く収縮し、その後他の部分が徐々に収縮する。これにより、樹脂製容器５０を金型６２から取り出した場合に、当該薄い部分を基点として上端部５２の上側が例えば内側に反ってしまう。この反りに、屈曲部５３及びフランジ５１も追従するため、最終的にフランジ５１が傾いてしまう（図９において右肩上がりとなる）。 (Effects of this embodiment, etc.)
In the reference example, as shown in FIG. 9, a cup-shaped resin container 50 is formed by sandwiching only the portion of the sheet material to be the flange 51 with the mold 61 and the mold 62, and then performing compressed air / vacuum forming. Was there. At this time, the upper end portion 52 of the body portion of the resin container 50 is cooled by the mold 61, and the bent portion 53 is naturally cooled or indirectly cooled by the mold 61 and the mold 62 via a flange or the like. To. Therefore, the cooling rate of the upper end portion 52 is faster than the cooling rate of the bent portion 53. Further, since the thickness of the upper end portion 52 is not uniform (the portion connected to the bent portion 53 is inevitably thick due to compressed air / vacuum forming), the cooling rate of the upper end portion 52 also differs depending on the location. Then, here, since the thin portion of the upper end portion 52 cools better than the thick portion, the thin portion contracts faster than the other portion, and then the other portion gradually contracts. As a result, when the resin container 50 is taken out from the mold 62, the upper side of the upper end portion 52 is warped inward, for example, with the thin portion as a base point. Since the bent portion 53 and the flange 51 also follow this warp, the flange 51 is finally tilted (in FIG. 9, it rises to the right).
　この実施の形態では、第１－２面Ｍ１２と第２－２面Ｍ２２とにより、シート材Ｓにおける、肉厚部１１Ｂ（胴部１１の上端部）及び屈曲部１３である部分Ｐとなる第２環状部分Ｓ２を、表面及び裏面の両方から挟み込み（圧縮）かつ冷却するので、部分Ｐを素早く冷却でき、肉厚部１１Ｂ及び屈曲部１３での異なる場所における冷却速度の差を小さくでき（収縮の差を小さくでき）、樹脂製容器１０の上端部の反りを防止（反りの発生を完全になくすこと、参考例よりも反りを軽減すること、の両者を含む表現である。「防止」について同じ）できる。さらに、冷却時において第１－２面Ｍ１２は肉厚部１１Ｂの内周面１１ＢＡ（第２環状部分Ｓ２の肉厚部１１Ｂとなる部分）を押さえつけることができ、肉厚部１１Ｂが径方向内側に沿ってしまうことを抑えることができる。さらに、冷却時において第２－２面Ｍ２２は肉厚部１１Ｂの外周面１１ＢＢ（第２環状部分Ｓ２の肉厚部１１Ｂとなる部分）を押さえつけることができ、肉厚部１１Ｂが径方向外側に沿ってしまうことを抑えることができる。さらに、第１－２面Ｍ１２と第２－２面Ｍ２２とにより第２環状部分Ｓ２を挟み込んだときの当該第１－２面Ｍ１２と第２－２面Ｍ２２との間隔を略均一とすることで、第２環状部分Ｓ２を均一に冷却でき（収縮の度合いを均一化でき）、胴部１１の反りを防止できる。なお、第２環状部分Ｓ２について冷却がある程度すすんでから又は冷却完了後に圧空・真空成形が行われ、シート材Ｓの簿肉部１１Ａとなる部分自体の冷却も略均一に行われる。このため、簿肉部１１Ａについて反りは発生しない。 In this embodiment, the first and second surfaces M12 and the second and second surfaces M22 form a thick portion 11B (upper end portion of the body portion 11) and a portion P which is a bent portion 13 in the sheet material S. Since the bicyclic portion S2 is sandwiched (compressed) and cooled from both the front surface and the back surface, the portion P can be cooled quickly, and the difference in cooling rate between the thick portion 11B and the bent portion 13 can be reduced (shrinkage). (The difference between the two can be reduced) and the upper end of the resin container 10 is prevented from warping (the occurrence of warping is completely eliminated, and the warping is reduced compared to the reference example). About "prevention" The same) can be done. Further, during cooling, the first and second surfaces M12 can press the inner peripheral surface 11BA of the wall thickness portion 11B (the portion of the second annular portion S2 that becomes the wall thickness portion 11B), and the wall thickness portion 11B is radially inside. It is possible to prevent the line from being followed. Further, at the time of cooling, the 2nd-2nd surface M22 can press the outer peripheral surface 11BB of the wall thickness portion 11B (the portion of the second annular portion S2 to be the wall thickness portion 11B), and the wall thickness portion 11B is radially outward. It is possible to prevent it from going along. Further, when the second annular portion S2 is sandwiched between the first and second surface M12 and the second and second surface M22, the distance between the first and second surface M12 and the second and second surface M22 is made substantially uniform. Therefore, the second annular portion S2 can be uniformly cooled (the degree of shrinkage can be made uniform), and the warp of the body portion 11 can be prevented. After the second annular portion S2 has been cooled to some extent or after the cooling is completed, compressed air / vacuum forming is performed, and the portion itself of the sheet material S to be the book meat portion 11A is also cooled substantially uniformly. Therefore, the book meat portion 11A does not warp.
　参考例において、フランジ５１を水平方向に沿わすため、上端部５２の反りを考慮した金型を用意することも考えられる。つまり、上端部５２の反りの分だけ、フランジ５１を水平方向に対して傾かせるよう金型の形状を調整することも考えられる。しかし、当該調整は手間がかかる。前記実施の形態では、前記のような調整が不要であり、胴部１１の上端部の反りの発生を容易に防止できる。なお、上記実施の形態において反りが若干発生する場合、当該反りの発生を考慮して、金型の形状を調整してもよい（第１－１面Ｍ１１、第２－１面Ｍ２１を若干傾かせる等）。 In the reference example, in order to align the flange 51 in the horizontal direction, it is conceivable to prepare a mold considering the warp of the upper end portion 52. That is, it is conceivable to adjust the shape of the mold so that the flange 51 is tilted in the horizontal direction by the amount of warpage of the upper end portion 52. However, the adjustment is time-consuming. In the above embodiment, the above adjustment is unnecessary, and the occurrence of warpage of the upper end portion of the body portion 11 can be easily prevented. If a slight warp occurs in the above embodiment, the shape of the mold may be adjusted in consideration of the occurrence of the warp (the 1-1 surface M11 and the 2-1 surface M21 are slightly tilted). Die etc.).
　第１－２面Ｍ１２と第２－２面Ｍ２２との間隔について、上記のように、Ｓ１：Ｓ２＝１：（０．７～１）の範囲内がよく、さらに好ましくは、Ｓ１：Ｓ２＝１：（０．９～１）の範囲内とすることで、樹脂製容器１０を大量生産する場合の反りの発生割合を低くすることができる。 As described above, the distance between the first and second surfaces M12 and the second and second surfaces M22 is preferably in the range of S1: S2 = 1: (0.7 to 1), and more preferably S1: S2 =. By setting the content within the range of 1: (0.9 to 1), the rate of warpage in mass production of the resin container 10 can be reduced.
　第１－２面Ｍ１２と第２－２面Ｍ２２とにより第２環状部分Ｓ２を挟み込みかつ冷却することができれば（上記のように、第１－２面Ｍ１２が第２環状部分Ｓ２における肉厚部１１Ｂとなる部分を内側から押さえつけることができれば）、当該冷却後に得られる部分Ｐ（冷却によって収縮した後の第２環状部分Ｓ２）の厚さは均一でなくてもよい。例えば、図８に示す状態よりも屈曲部１３及び肉厚部１１Ｂが全体的に又は部分的に収縮してもよい（例えば、屈曲部１３から肉厚部１１Ｂにかけて、収縮率が下方に向けて徐々に大きくなる、つまり、厚さが下方に向けて徐々に薄くなってもよい）。本願発明者が、樹脂製容器１０を上記方法により形成したところ、反りが生じなかった樹脂製容器１０の部分Ｐの最も厚い厚さ（屈曲部１３のフランジ１４側端部の厚さ）Ｔ１を「１」とした場合の当該部分Ｐにおける最も薄い厚さ（肉厚部１１Ｂの最も薄い部分の厚さ）Ｔ２は「０．５７」～「０．７１５」（Ｔ１：Ｔ２＝１：（０．５７～０．７１５））の範囲内となる場合があった。部分Ｐの厚さは略均一の方が、上記冷却速度に差が生じないと考えられるので、部分Ｐの最も厚い厚さＴ１を「１」とした場合の部分Ｐの最も薄い厚さＴ２は「０．５７」～「１」の範囲内がよい（このような範囲内となるように第１金型１１０及び第２金型１２０を設計するとよい）。胴部１１は、屈曲部１３の最も厚い部分の厚さを「１」とした場合に「０．５７」～「１」の範囲内の厚みを有する肉厚部１１Ｂ（上端部）を有するとよい。肉厚部１１Ｂの厚みは、場所によらず「０．５７」～「１」の範囲内であれば、場所に応じて異なってもよい。前記の範囲内の肉厚部１１Ｂにより、反りを防止しやすい構造が得られる。 If the second annular portion S2 can be sandwiched and cooled by the first and second surface M12 and the second and second surface M22 (as described above, the first and second surface M12 is the thick portion in the second annular portion S2). (If the portion to be 11B can be pressed from the inside), the thickness of the portion P (second annular portion S2 after shrinking by cooling) obtained after the cooling does not have to be uniform. For example, the bent portion 13 and the thick portion 11B may be contracted entirely or partially from the state shown in FIG. 8 (for example, the shrinkage rate is downward from the bent portion 13 to the thick portion 11B). Gradually increase, that is, the thickness may gradually decrease downward). When the inventor of the present application formed the resin container 10 by the above method, the thickest thickness (thickness of the flange 14 side end portion of the bent portion 13) T1 of the portion P of the resin container 10 in which warpage did not occur was obtained. When "1" is set, the thinnest thickness in the portion P (thickness of the thinnest portion of the thick portion 11B) T2 is "0.57" to "0.715" (T1: T2 = 1: (0). In some cases, it was within the range of .57 to 0.715)). It is considered that there is no difference in the cooling rate when the thickness of the portion P is substantially uniform. Therefore, when the thickest thickness T1 of the portion P is set to "1", the thinnest thickness T2 of the portion P is The range of "0.57" to "1" is preferable (the first mold 110 and the second mold 120 may be designed so as to be within such a range). The body portion 11 has a wall thickness portion 11B (upper end portion) having a thickness in the range of "0.57" to "1" when the thickness of the thickest portion of the bent portion 13 is "1". Good. The thickness of the wall thickness portion 11B may differ depending on the location as long as it is within the range of "0.57" to "1" regardless of the location. The thick portion 11B within the above range provides a structure that easily prevents warpage.
　樹脂製容器１０において、屈曲部１３及びフランジ１４からなる部分の下面には凹部Ｒが設けられている。この凹部Ｒが設けられた部分により、ある程度の弾性が得られ、フランジ１４等に衝撃が加わった際の耐衝撃性が得られる。 In the resin container 10, a recess R is provided on the lower surface of the portion including the bent portion 13 and the flange 14. A certain degree of elasticity can be obtained from the portion provided with the recess R, and impact resistance when an impact is applied to the flange 14 or the like can be obtained.
　上記のように、凹部１４Ｃの内面が、上下方向に対して傾き、下面１４Ｂから径方向内側に向かう斜め上方に延びて屈曲部１３の外周面１３Ｂに達することで、フランジ１４における屈曲部１３側の縁部（内周縁部）の厚さは、屈曲部１３に向かって徐々に薄くなっている。仮に、当該凹部１４Ｃの内面を角張らせる場合（凹部１４Ｃの内面を上下方向に延びた面と水平面とにより構成する場合）、フランジ１４の冷却速度が場所によって均一でなくなり、フランジ１４の成形時に、当該フランジ１４の上面１４Ａにヒケが生じる、又は、フランジ１４が反ってしまうことがある。凹部１４Ｃを形成し、フランジ１４における屈曲部１３側の縁部（内周縁部）の厚さを屈曲部１３に向かって徐々に薄くすることで、フランジ１４の冷却速度を場所によらずに一定に近づけることができ、前記ヒケ及び反りの発生を防止できる。 As described above, the inner surface of the recess 14C is tilted in the vertical direction, extends diagonally upward from the lower surface 14B toward the inside in the radial direction, and reaches the outer peripheral surface 13B of the bent portion 13, thereby reaching the bent portion 13 side of the flange 14. The thickness of the edge portion (inner peripheral edge portion) of the is gradually reduced toward the bent portion 13. If the inner surface of the recess 14C is angular (when the inner surface of the recess 14C is composed of a surface extending in the vertical direction and a horizontal plane), the cooling rate of the flange 14 becomes uneven depending on the location, and the flange 14 is formed during molding. , The upper surface 14A of the flange 14 may have a sink mark, or the flange 14 may warp. By forming the recess 14C and gradually reducing the thickness of the edge (inner peripheral edge) of the flange 14 on the bent portion 13 side toward the bent portion 13, the cooling rate of the flange 14 is constant regardless of the location. It is possible to prevent the sink marks and warpage from occurring.
（変形例）
　本発明は上記実施の形態に限定されない。上記実施の形態については適宜変更してもよい。以下、変形例を列挙する。 (Modification example)
The present invention is not limited to the above embodiment. The above embodiment may be changed as appropriate. The modified examples are listed below.
　フランジ１４の厚さを、屈曲部１３と同じとしてもよい。また、図１０に示すように、凹部１４Ｃを省略し、フランジ１４の下面１４Ｂを傾斜させ、屈曲部１３の外周面１３Ｂに繋げてもよい。これらの構造を採用する場合には、第２金型１２０の形状を、当該構造の形状に合わせて変更する。例えば、図１０のような構成を採用する場合、円筒部材１２１の上面１２１Ａを傾斜させ、かつ、上面１２１Ａの内周側端部が上端部１２２Ａの上面１２２ＡＡの頂点部分に繋がるよう（円筒部材１２１の上端部が上端部１２２Ａの上に乗り上げるよう）、円筒部材１２１の上端部の形状を変更する。ここで、第２金型１２０のうち、キャビティ１２２は、凹部の内面を所望の形状に加工しやすいようにアルミ等の比較的柔らかい材料で形成されるが、円筒部材１２１は、カッタ１３０との協働によるシート材Ｓのカットのため、カッタ１３０と同様に比較的固い材料（例えば、鋼材）により形成される。従って、前記のように円筒部材１２１の上端部の形状を加工することは一般に困難である（円筒部材１２１が固い材料で形成されるため）。上記実施の形態の形状は、第２金型１２０の加工のしやすさ等において、図１０の形状等よりも優位である。 The thickness of the flange 14 may be the same as that of the bent portion 13. Further, as shown in FIG. 10, the recess 14C may be omitted, and the lower surface 14B of the flange 14 may be inclined and connected to the outer peripheral surface 13B of the bent portion 13. When adopting these structures, the shape of the second mold 120 is changed according to the shape of the structure. For example, when the configuration as shown in FIG. 10 is adopted, the upper surface 121A of the cylindrical member 121 is inclined so that the inner peripheral side end portion of the upper surface 121A is connected to the apex portion of the upper surface 122AA of the upper end portion 122A (cylindrical member 121). The shape of the upper end of the cylindrical member 121 is changed so that the upper end of the cylinder member 121 rides on the upper end 122A). Here, in the second mold 120, the cavity 122 is formed of a relatively soft material such as aluminum so that the inner surface of the recess can be easily processed into a desired shape, while the cylindrical member 121 is with the cutter 130. Since the sheet material S is cut by cooperation, it is formed of a relatively hard material (for example, a steel material) like the cutter 130. Therefore, it is generally difficult to process the shape of the upper end portion of the cylindrical member 121 as described above (because the cylindrical member 121 is made of a hard material). The shape of the above-described embodiment is superior to the shape of FIG. 10 in terms of ease of processing of the second mold 120 and the like.
　樹脂製容器１０の胴部１１は、円筒状に限らず、広く筒状であればよい。筒状は、円筒状の他、輪切りにした断面が多角形状（四角形状、六角形状）、楕円形状等となるものを含む。この場合、樹脂製容器１０の形状が円筒状でない場合、第１金型１１０、第２金型１２０、及び、カッタ１３０等の上記形状も、樹脂製容器１０の形状に合わせて変更する。例えば、第１金型１１０、第２金型１２０、及び、カッタ１３０等における円筒部分は、樹脂製容器１０の形状に合わせた筒状とすればよい。また、フランジ１４は、外側が上方に位置するよう傾斜していてもよい。この場合、第１金型１１０の下面１１１及び第２金型１２０の上面１２１Ａを外周側が内周側よりも上方に位置するように傾斜させるとよい（すり鉢状に形成するとよい）。この場合、第２環状部分Ｓ２を第１－２面Ｍ１２と第２－２面Ｍ２２とにより挟み込む際、第１－２面Ｍ１２の全部が第２金型１２０内に入り込んでもよい。第１－２面Ｍ１２は、その少なくとも一部が第２金型１２０内に入り込むとよい。 The body portion 11 of the resin container 10 is not limited to a cylindrical shape, but may be a wide tubular shape. The tubular shape includes not only a cylindrical shape but also a circularly sliced cross section having a polygonal shape (square shape, hexagonal shape), an elliptical shape, or the like. In this case, if the shape of the resin container 10 is not cylindrical, the above shapes of the first mold 110, the second mold 120, the cutter 130, and the like are also changed according to the shape of the resin container 10. For example, the cylindrical portion of the first mold 110, the second mold 120, the cutter 130, and the like may have a tubular shape that matches the shape of the resin container 10. Further, the flange 14 may be inclined so that the outer side is located upward. In this case, the lower surface 111 of the first mold 110 and the upper surface 121A of the second mold 120 may be inclined so that the outer peripheral side is located above the inner peripheral side (the shape may be formed in a mortar shape). In this case, when the second annular portion S2 is sandwiched between the first and second surface M12 and the second and second surface M22, all of the first and second surface M12 may enter the second mold 120. At least a part of the first and second surface M12 may enter the second mold 120.
　シート材Ｓを樹脂製容器１０に対応した形状に予めカットしてから、第１金型１１０と第２金型１２０とにより挟み込んでもよい。 The sheet material S may be cut in advance into a shape corresponding to the resin container 10 and then sandwiched between the first mold 110 and the second mold 120.
　部分Ｐの最も厚い厚さＴ１を「１」とした場合の部分Ｐの最も薄い厚さＴ２の範囲（または、屈曲部１３の最も厚い部分の厚さを「１」とした場合の肉厚部の厚さの範囲）の上限は、「１」、「０．９」、「０．８」、「０．７」のいずれかとしてもよく、下限は、「０．８」、「０．７」、「０．６」、「０．５」のいずれかとしてもよい。厚さＴ２の範囲（または、前記肉厚部の厚さの範囲）は、０．５７～０．７１５としてもよい。第１金型１１０、第２金型１２０以外の金型を使用してもよく、このような場合でも（例えば、上記のように、第１－２面Ｍ１２が第２環状部分Ｓ２における肉厚部１１Ｂとなる部分を内側から押さえつけなくても）、上記部分Ｐの厚さを均一又は均一に近くすること（例えば上限を「１」、「０．９」、「０．８」のいずれか、下限を「０．７」、「０．８」のいずれかにすること）で、前記の反りは防止できる。 The range of the thinnest thickness T2 of the portion P when the thickest thickness T1 of the portion P is "1" (or the wall thickness portion when the thickness of the thickest portion of the bent portion 13 is "1"). The upper limit of (the range of the thickness of) may be any of "1", "0.9", "0.8", and "0.7", and the lower limit is "0.8" and "0. It may be any one of "7", "0.6" and "0.5". The range of the thickness T2 (or the range of the thickness of the thick portion) may be 0.57 to 0.715. A mold other than the first mold 110 and the second mold 120 may be used, and even in such a case (for example, as described above, the first and second surfaces M12 have a wall thickness in the second annular portion S2. The thickness of the portion P should be uniform or close to uniform (for example, the upper limit should be any one of "1", "0.9", and "0.8") without pressing the portion to be the portion 11B from the inside. , The lower limit is set to either "0.7" or "0.8") to prevent the warp.
　本発明は、本発明の広義の精神と範囲を逸脱することなく、様々な実施の形態及び変形が可能とされるものである。また、上述した実施の形態は、この発明を説明するためのものであり、本発明の範囲を限定するものではない。すなわち、本発明の範囲は、実施の形態ではなく、特許請求の範囲によって示される。そして、特許請求の範囲内及びそれと同等の発明の意義の範囲内で施される様々な変形が、この発明の範囲内とみなされる。 The present invention enables various embodiments and modifications without departing from the broad spirit and scope of the present invention. Moreover, the above-described embodiment is for explaining the present invention, and does not limit the scope of the present invention. That is, the scope of the present invention is indicated by the scope of claims, not by the embodiment. Then, various modifications made within the scope of the claims and the equivalent meaning of the invention are considered to be within the scope of the present invention.
　本出願は、２０１９年４月２４日に出願された、日本国特許出願特願２０１９－８２７３９号に基づく。本明細書中に日本国特許出願特願２０１９－８２７３９号の明細書、特許請求の範囲、図面全体を参照として取り込むものとする。 This application is based on Japanese Patent Application No. 2019-82739, which was filed on April 24, 2019. The specification, claims, and drawings of Japanese Patent Application No. 2019-82739 shall be incorporated into this specification as a reference.
１０　樹脂製容器
　１１　胴部
　　１１Ａ　簿肉部
　　１１Ｂ　肉厚部
　　　１１ＢＡ　内周面
　　　１１ＢＢ　外周面
　１２　底
　１３　屈曲部
　　１３Ａ　内周面
　　１３Ｂ　外周面
　１４　フランジ
　　１４Ａ　上面
　　１４Ｂ　下面
　　１４Ｃ　凹部
１００　製造装置
　１１０　第１金型
　１１０Ａ　下端部
　　１１１　下面
　　１１２　凸部
　　　１１２Ａ　第１曲面
　　　１１２Ｂ　第２曲面
　１２０　第２金型
　１２０Ａ　上端部
　　１２１　円筒部材
　　　１２１Ａ　上面
　　１２２　キャビティ
　　　１２２Ａ　上端部
　　　　１２２ＡＡ　上面
　　　　　１２２ＡＡＡ　第１上面
　　　　　１２２ＡＡＢ　第２上面
　　　　１２２ＡＢ　内周面
Ｍ１１　第１－１面
Ｍ１２　第１－２面
Ｍ２１　第２－１面
Ｍ２２　第２－２面
Ｐ　屈曲部と肉厚部とからなる部分
Ｓ　シート材
　Ｓ１　第１環状部分
　Ｓ２　第２環状部分
Ｒ　凹部 10 Resin container 11 Body part 11A Book meat part 11B Thick part 11BA Inner peripheral surface 11BB Outer peripheral surface 12 Bottom 13 Bent part 13A Inner peripheral surface 13B Outer peripheral surface 14 Flange 14A Upper surface 14B Lower surface 14C Recess 100 Manufacturing equipment 110 First mold 110A Lower end 111 Lower lower surface 112 Convex 112A First curved surface 112B Second curved surface 120 Second mold 120A Upper end 121 Cylindrical member 121A Upper surface 122 Cavity 122A Upper end 122AA Upper surface 122AAA First upper surface 122AAB Second upper surface 122AB Inner peripheral surface M11 1-1 surface M12 1st-2nd surface M21 2nd-1st surface M22 2nd-2nd surface P Part consisting of bent part and thick part S Sheet material S1 1st annular part S2 2nd annular part R Recess

Claims (6)

  1. 　筒状の胴部と、前記胴部の下側開口を閉口する底と、前記胴部の上端から外側に屈曲した屈曲部と、当該屈曲部から外側に張り出したフランジと、を有する樹脂製容器の製造方法であって、
    　加熱された熱可塑性樹脂製のシート材のうち、前記フランジに成形される第１環状部分と、前記胴部の前記上端を含む上端部及び前記屈曲部に成形される第２環状部分とを、前記シート材の上側に位置する第１金型と、前記シート材の下側に位置する第２金型とにより上下方向から挟み込む第１ステップと、
    　前記第１金型と前記第２金型とにより前記第１環状部分及び前記第２環状部分が挟み込まれた前記シート材に対して圧空成形と真空成形とのうちの少なくとも一方を行う第２ステップと、を有し、
    　前記第１金型は、前記フランジに対応した第１－１面と、前記上端部及び前記屈曲部に対応した第１－２面と、を備え、
    　前記第２金型は、前記フランジに対応した第２－１面と、前記上端部及び前記屈曲部に対応した第２－２面と、を備え、
    　前記第１金型と前記第２金型とにより前記第１環状部分及び前記第２環状部分が挟み込まれた場合に、前記第１－２面は、その少なくとも一部が前記第２金型内に入り込んで前記第２－２面と対向し、
    　前記第１環状部分は、前記第１－１面と前記第２－１面とにより挟み込まれ冷却されることで前記フランジに成形され、
    　前記第２環状部分は、前記第１－２面と前記第２－２面とにより挟み込まれ冷却されることで前記上端部及び前記屈曲部に成形される、
    　樹脂製容器の製造方法。     A resin container having a tubular body, a bottom that closes the lower opening of the body, a bent portion that bends outward from the upper end of the body, and a flange that projects outward from the bent portion. It is a manufacturing method of
    Among the heated thermoplastic resin sheet materials, a first annular portion formed on the flange, an upper end portion including the upper end of the body portion, and a second annular portion formed on the bent portion are provided. A first step of sandwiching the sheet material from above and below by a first mold located on the upper side of the sheet material and a second mold located on the lower side of the sheet material.
    A second step of performing at least one of pressure forming and vacuum forming on the sheet material in which the first annular portion and the second annular portion are sandwiched between the first mold and the second mold. And have
    The first mold includes a 1-1 surface corresponding to the flange and a 1-2 surface corresponding to the upper end portion and the bent portion.
    The second mold includes a 2-1 surface corresponding to the flange and a 2-2 surface corresponding to the upper end portion and the bent portion.
    When the first annular portion and the second annular portion are sandwiched between the first mold and the second mold, at least a part of the first and second surfaces is inside the second mold. Enter and face the 2-2 surface,
    The first annular portion is formed into the flange by being sandwiched between the 1-1 surface and the 2-1 surface and cooled.
    The second annular portion is formed into the upper end portion and the bent portion by being sandwiched between the first and second surfaces and the second and second surfaces and cooled.
    A method for manufacturing a resin container.
  2. 　前記第２環状部分が前記第１－２面と前記第２－２面とにより挟み込まれるときの前記第１－２面と前記第２－２面との距離は、最も長い距離を１としたとき、最も短い距離が０．７以上１以下の範囲にある、
    　請求項１に記載の樹脂製容器の製造方法。     When the second annular portion is sandwiched between the first and second surfaces and the second and second surfaces, the longest distance between the first and second surfaces and the second and second surfaces is set to 1. When the shortest distance is in the range of 0.7 or more and 1 or less,
    The method for manufacturing a resin container according to claim 1.
  3. 　筒状の胴部と、前記胴部の下側開口を閉口する底と、前記胴部の上端から外側に屈曲した屈曲部と、当該屈曲部から外側に張り出したフランジと、を有する樹脂製容器を、圧空成形と真空成形とのうちの少なくとも一方を行うことにより製造する製造装置であって、
    　加熱された熱可塑性樹脂製のシート材のうち、前記フランジに成形される第１環状部分と、前記胴部の前記上端を含む上端部及び前記屈曲部に成形される第２環状部分とを、上下方向から挟み込む一対の金型を備え、
    　前記一対の金型の一方は前記シート材の上側に位置する第１金型であり、他方は前記シート材の下側に位置する第２金型であり、
    　前記第１金型は、前記フランジに対応した第１－１面と、前記上端部及び前記屈曲部に対応した第１－２面と、を備え、
    　前記第２金型は、前記フランジに対応した第２－１面と、前記上端部及び前記屈曲部に対応した第２－２面と、を備え、
    　前記第１金型と前記第２金型とにより前記第１環状部分及び前記第２環状部分が挟み込まれた場合に、前記第１－２面は、その少なくとも一部が前記第２金型内に入り込んで前記第２－２面と対向し、
    　前記第１－１面と前記第２－１面とは、前記第１環状部分を挟み込み冷却することで前記フランジに成形し、
    　前記第１－２面と前記第２－２面とは、前記第２環状部分を挟み込み冷却することで前記上端部及び前記屈曲部に成形する、
    　樹脂製容器の製造装置。     A resin container having a tubular body, a bottom that closes the lower opening of the body, a bent portion that bends outward from the upper end of the body, and a flange that projects outward from the bent portion. Is a manufacturing apparatus for manufacturing by performing at least one of pressure forming and vacuum forming.
    Among the heated thermoplastic resin sheet materials, a first annular portion formed on the flange, an upper end portion including the upper end of the body portion, and a second annular portion formed on the bent portion are provided. Equipped with a pair of molds that are sandwiched from above and below,
    One of the pair of molds is a first mold located on the upper side of the sheet material, and the other is a second mold located on the lower side of the sheet material.
    The first mold includes a 1-1 surface corresponding to the flange and a 1-2 surface corresponding to the upper end portion and the bent portion.
    The second mold includes a 2-1 surface corresponding to the flange and a 2-2 surface corresponding to the upper end portion and the bent portion.
    When the first annular portion and the second annular portion are sandwiched between the first mold and the second mold, at least a part of the first and second surfaces is inside the second mold. Enter and face the 2-2 surface,
    The 1-1 surface and the 2-1 surface are formed into the flange by sandwiching and cooling the first annular portion.
    The first and second surfaces and the second and second surfaces are formed into the upper end portion and the bent portion by sandwiching and cooling the second annular portion.
    Equipment for manufacturing resin containers.
  4. 　熱可塑性樹脂で形成された樹脂製容器であって、
    　筒状の胴部と、
    　前記胴部の下側開口を閉口する底と、
    　前記胴部の上端から外側に屈曲した屈曲部と、
    　前記屈曲部から外側に張り出したフランジと、を備え、
    　前記胴部は、前記上端を含む上端部であって、前記屈曲部の最も厚い部分の厚さを「１」とした場合に「０．５７」～「１」の範囲内の厚みを有する上端部を有する、
    　樹脂製容器。     A resin container made of thermoplastic resin.
    With a tubular body
    The bottom that closes the lower opening of the body and
    A bent portion bent outward from the upper end of the body portion,
    A flange that projects outward from the bent portion is provided.
    The body portion is an upper end portion including the upper end portion, and has a thickness in the range of "0.57" to "1" when the thickness of the thickest portion of the bent portion is "1". Have a part,
    Resin container.
  5. 　前記胴部は、前記上端部から下方に延びており当該上端部よりも簿肉の簿肉部を有し、
    　前記上端部は、厚さが略均一である、
    　請求項４に記載の樹脂製容器。     The body portion extends downward from the upper end portion and has a book meat portion of the book meat than the upper end portion.
    The upper end portion has a substantially uniform thickness.
    The resin container according to claim 4.
  6. 　前記フランジは、
    　　前記屈曲部よりも厚く、
    　　前記フランジの前記屈曲部側の縁部に、当該縁部の厚さを前記屈曲部に向かって徐々に薄くする凹部を備える、
    　請求項４又は５に記載の樹脂製容器。     The flange is
    Thicker than the bent part
    The edge of the flange on the bent portion side is provided with a recess that gradually reduces the thickness of the edge toward the bent portion.
    The resin container according to claim 4 or 5.
PCT/JP2020/000085 2019-04-24 2020-01-06 Method for manufacturing resin container, apparatus for manufacturing resin container, and resin container WO2020217596A1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5955713A (en) * 1982-09-27 1984-03-30 Kishimoto Akira Preparation of plastic container
JPS63191776A (en) * 1987-01-26 1988-08-09 株式会社カネヒロ食品 Seal structure of vessel
JPS6426425A (en) * 1987-07-22 1989-01-27 Dainippon Printing Co Ltd Manufacture of plastic vessel
JPH04201318A (en) * 1990-11-30 1992-07-22 Dainippon Printing Co Ltd Molding device for vessel
JP2007276800A (en) * 2006-04-04 2007-10-25 Toyo Science Co Ltd Container

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018027823A (en) 2017-10-23 2018-02-22 有限会社Ｋ・Ｍプランニング Cup container

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5955713A (en) * 1982-09-27 1984-03-30 Kishimoto Akira Preparation of plastic container
JPS63191776A (en) * 1987-01-26 1988-08-09 株式会社カネヒロ食品 Seal structure of vessel
JPS6426425A (en) * 1987-07-22 1989-01-27 Dainippon Printing Co Ltd Manufacture of plastic vessel
JPH04201318A (en) * 1990-11-30 1992-07-22 Dainippon Printing Co Ltd Molding device for vessel
JP2007276800A (en) * 2006-04-04 2007-10-25 Toyo Science Co Ltd Container

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