WO2020217596A1 - Procédé de fabrication de contenant en résine, appareil de fabrication de contenant en résine et contenant en résine - Google Patents

Procédé de fabrication de contenant en résine, appareil de fabrication de contenant en résine et contenant en résine 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
English (en)
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/ja
Publication of WO2020217596A1 publication Critical patent/WO2020217596A1/fr

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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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)

Abstract

Une seconde partie annulaire d'un matériau en feuille est maintenue entre une première-seconde surface (M12) comprenant une première surface incurvée (112A) et une seconde surface incurvée (112B) au niveau d'une extrémité inférieure (110A) d'un premier moule et d'une seconde surface incurvée (M22) comprenant une partie (partie correspondant à une surface périphérique externe [13B] d'une partie de flexion [13]) d'une surface supérieure (122AA) et une surface périphérique interne (122AB) au niveau d'une extrémité supérieure (120A) d'un second moule. Lesdites surfaces correspondent à une partie épaisse (11B) et à la partie de flexion (13). La seconde partie annulaire est maintenue entre la première-seconde surface (M12) et la seconde-seconde surface (M22), refroidie par mise en contact de la première-seconde surface (M12)) et la seconde-seconde surface (M22), et enfin moulée dans la partie épaisse (11B) et la partie de flexion (13).
PCT/JP2020/000085 2019-04-24 2020-01-06 Procédé de fabrication de contenant en résine, appareil de fabrication de contenant en résine et contenant en résine WO2020217596A1 (fr)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5955713A (ja) * 1982-09-27 1984-03-30 Kishimoto Akira プラスチツク容器の製造方法
JPS63191776A (ja) * 1987-01-26 1988-08-09 株式会社カネヒロ食品 容器のシ−ル構造
JPS6426425A (en) * 1987-07-22 1989-01-27 Dainippon Printing Co Ltd Manufacture of plastic vessel
JPH04201318A (ja) * 1990-11-30 1992-07-22 Dainippon Printing Co Ltd 容器成形装置
JP2007276800A (ja) * 2006-04-04 2007-10-25 Toyo Science Co Ltd 容器

Family Cites Families (1)

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

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5955713A (ja) * 1982-09-27 1984-03-30 Kishimoto Akira プラスチツク容器の製造方法
JPS63191776A (ja) * 1987-01-26 1988-08-09 株式会社カネヒロ食品 容器のシ−ル構造
JPS6426425A (en) * 1987-07-22 1989-01-27 Dainippon Printing Co Ltd Manufacture of plastic vessel
JPH04201318A (ja) * 1990-11-30 1992-07-22 Dainippon Printing Co Ltd 容器成形装置
JP2007276800A (ja) * 2006-04-04 2007-10-25 Toyo Science Co Ltd 容器

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