JP2007216998A - Blowing receptacle with fractured part made of polyester resin and its manufacturing process - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a receptacle having a fractured part made of polyester resin showing an improved openability and its manufacturing process. <P>SOLUTION: A receptacle having a ruptured structure is provided, which consists of a polyester resin, comprises an opening part 20 continuous to a main body of the receptacle and a ruptured part 30 above the opening part 20 in an integral arrangement, and ruptures an interface part between an opening end 22 of the opening part 20 and the ruptured part 30 to open. A groove 40 is formed in substantially the perpendicular direction relative to an outer surface of the interface part between the opening end 22 of the opening part 20 and the ruptured part 30. An ultimate viscosity of polyester resin at the peripheral part of the groove 40 is set to be smaller than an ultimate vicosity of polyester resin at a part other than the peripheral portion of the groove 40. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a container with a fractured portion made of polyester resin and a method for producing the same, and particularly to an improvement in ease of opening in a container with a fractured portion using a polyester resin as a raw material.

  A twist-off container having a structure to be broken is disclosed in Japanese Patent Laid-Open No. 2002-321750. The invention disclosed in this publication was previously filed by the present applicant, and an olefin resin is used as the material of the container. Olefin resin is one of the most suitable resins for a container with a fractured part because it is excellent in heat sealing performance, easily twisted off and snap-off, and hardly leaves a fracture mark.

  On the other hand, since the food system for specified health use was established in September 1991, since then, many beverages containing dietary fibers called functional beverages that can exert physical condition control functions and calcium drinks have been released. ing. When such functional drinks or liquid pharmaceuticals are packed in a container, the container made of polyester resin does not transfer the scent of the resin to the contents of the container made of polyester resin than the container made of olefin resin. Is inactive with respect to the contents, and further, it is desirable to use a container made of polyester resin because the components of the contents do not adsorb to the resin.

JP 2002-321750 A

  However, when a container with a ruptured part is manufactured using a polyester resin, the polyester resin is inferior in heat sealing performance, and also has a stickiness, so it is difficult to break when twisted off or snapped off, and pulls on a thread. There was a problem of causing the phenomenon. The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a container with a fractured part made of polyester resin with improved ease of opening and a method for producing the same. is there.

  In the container with a fractured part using a polyester resin, the inventors form a groove by irradiating a laser on the outer surface of the boundary part between the opening end of the mouth part and the fractured part, and then rapidly quenching. The resin is thinned in the groove, and the polyester resin becomes brittle due to a decrease in the intrinsic viscosity of the resin around the groove. The inventors have found that a container can be obtained and have completed the present invention.

  That is, the container with a ruptured portion made of polyester resin according to the present invention is made of a polyester resin, and integrally includes a mouth portion continuous with the container body and a ruptured portion located above the mouth portion. , In a container having a ruptured structure that opens by breaking a boundary portion between the opening end of the mouth portion and the ruptured portion, with respect to an outer surface of the boundary portion between the opening end of the mouth portion and the ruptured portion. A groove is formed in a substantially vertical direction, and the intrinsic viscosity of the polyester resin in the peripheral portion of the groove is smaller than the intrinsic viscosity of the polyester resin other than the peripheral portion of the groove.

  Moreover, in the said container with a to-be-ruptured part made from a polyester resin, it is suitable that the depth of the said groove | channel is 30 to 90% of the thickness of the said groove periphery part. Moreover, in the said container with a to-be-breaked part made from a polyester resin, it is suitable that the intrinsic viscosity of the polyester resin in the said groove periphery part has fallen 10% or more than the intrinsic viscosity of polyester resins other than this groove periphery part. .

  Moreover, in the said container with a to-be-breakable part made from a polyester resin, the said polyester resin is adipic acid, terephthalic acid, 2, 6- naphthalene dicarboxylic acid, 4, 4- biphenyl carboxylic acid, oxalic acid, succinic acid, as an acid component, It consists of one or more selected from glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, dodecadioic acid, trans-1,4-cyclohexanedicarboxylic acid, isophthalic acid, Selected from ethylene glycol, trimethylene glycol (1,3-propanediol), tetramethylene glycol (1,4-butanediol), pentamethylene glycol, hexamethylene glycol, 1,4-hexanedimethanol, bisphenol A, spiroglycol Is A one or homo-polyester resin of two or more, or copolyester resin, it is preferred that the intrinsic viscosity of polyester resin 0.8~1.5dl / g.

  Further, in the container with a ruptured part made of polyester resin, a bottom part, a trunk part including a rectangular parallelepiped part and a mouth and neck part, a mouth part continuous with the mouth and neck part, and a spherical part located above the mouth part And a plate-shaped knob portion and a thin portion are integrally provided, and the opening end of the mouth portion is sealed by the spherical portion, and the knob portion is continuous with the mouth portion through the thin portion. And the knob portion hangs down to the mouth and neck portion across the mouth portion, and is on a horizontal straight line perpendicular to the axial direction of the container including the boundary portion between the open end of the mouth portion and the to-be-broken portion. In addition, it is preferable that grooves are formed across the knobs at both ends.

  Moreover, the manufacturing method of the container with a rupture part made of polyester resin according to the present invention is such that the material of the container is a polyester resin, the mouth part continuous with the container body, and the rupture part located above the mouth part. In a manufacturing method of a container having a structure to be ruptured, which is provided integrally and has an opening by breaking a boundary between the opening end of the mouth and the portion to be broken, at least the opening end of the mouth and the portion to be broken A groove forming step of irradiating a laser in a substantially vertical direction with respect to the outer surface of the boundary portion to form a groove, and a rapid cooling step of allowing the groove to stand and cool after the step are provided. is there.

  Moreover, in the manufacturing method of the container with a rupture part made of the polyester resin, the groove forming step moves laser light having an output of 1.0 to 100 W and a laser beam diameter of 0.1 to 5.0 mm at a rate of 10 to 500 mm / sec. It is preferable to irradiate. Moreover, in the manufacturing method of the said container with a broken part made from a polyester resin, it is suitable for a rapid cooling process to hold | maintain at 0-50 degreeC for 0.1 to 30 second.

  Moreover, in the manufacturing method of the said container with a torn part made from a polyester resin, the said polyester resin is adipic acid, terephthalic acid, 2, 6- naphthalene dicarboxylic acid, 4, 4- biphenyl carboxylic acid, oxalic acid as an acid component, Consists of one or more selected from succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, dodecadioic acid, trans-1,4-cyclohexanedicarboxylic acid, isophthalic acid, glycol As components, ethylene glycol, trimethylene glycol (1,3-propanediol), tetramethylene glycol (1,4-butanediol), pentamethylene glycol, hexamethylene glycol, 1,4-hexanedimethanol, bisphenol A, spiro Glycol or A one or homo-polyester resin of two or more, or copolyester resin, which is selected, it is preferable that the intrinsic viscosity of polyester resin 0.8~1.5dl / g.

  Further, in the method for manufacturing a container with a ruptured part made of polyester resin, a preformed body extrusion step of extruding a polyester resin preform from an extruder, and sandwiching the preformed body with a mold and sealing the bottom part together And forming a body bottom and a bottom at the lower portion of the preform by flowing a pressure fluid from the opening end, and filling the contents into the body from the opening end of the preform It is preferable to include a filling process and a fractured structure forming process in which the preform is sandwiched between molds and the upper part is held to form a mouth and a fractured part at the upper part of the preform.

  According to the present invention, in a container with a ruptured part using a polyester resin, a laser is irradiated on the outer surface of the boundary part between the opening end of the mouth part and the ruptured part to form a groove, and then rapidly cooled The resin is thinned in the groove, and the polyester resin becomes brittle due to a decrease in the intrinsic viscosity of the resin around the groove. A container is obtained. Furthermore, in the container with a fractured part made of polyester resin according to the present invention, the polyester resin in the peripheral part of the groove is heated by a laser, so that the molecular weight of the resin is lowered and the polyester resin becomes brittle due to hydrolysis. The ease of opening is improved.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view, FIG. 2 is a side view, and FIG. 3 is a plan view of a container with a broken portion made of polyester resin according to an embodiment of the present invention.

  A container 10 with a broken portion made of polyester resin according to an embodiment of the present invention includes a bottom portion 12 having a substantially rectangular shape and a flat shape, a rectangular parallelepiped portion 14 that is continuous with the bottom portion 12, and a substantially cylindrical mouth and neck. A body portion 18 including a portion 16 and a mouth portion 20 are provided continuously above the mouth-and-neck portion 16. Above the mouth portion 20, a broken portion 30 including a hollow spherical portion 32, a plate-shaped knob portion 34, and a thin portion 36 is integrally provided. The opening end 22 of the mouth portion 20 is sealed by the spherical portion 32, and the inside of the container body constituted by the bottom portion 12, the body portion 14 and the mouth portion 20 is hollow. Further, a thin portion 36 is formed around the mouth portion 20 and the spherical portion 32 and is continuous to the plate-like knob portion 34, and the knob portion 34 straddles the mouth portion 20 to form the mouth and neck portion. It hangs down to 16. In addition, in order to make it easy to open the thin portion 36, the vicinity of the ridge of the mouth portion 20 may be a slit, and a boundary portion between the opening end 22 of the mouth portion 20 and the portion to be broken 30 (spherical portion 32). It is only necessary to be formed. And this container 10 with a to-be-breakable part made from a polyester resin is a container by breaking and opening the boundary part of the opening end 22 of this mouth part 20 and this to-be-broken part 30 (spherical part 32) at the time of use. Contents such as functional beverages and liquid medicines filled in advance can be poured out.

<Groove formation>
Here, in the container with a fractured part made of polyester resin according to one embodiment of the present invention, the outer surface of the boundary part between the opening end 22 of the mouth and the fractured part 30 (spherical part 32), A carbon dioxide laser beam is irradiated from both sides in a substantially vertical direction, and a groove 40 is formed. That is, the polyester resin present in the portion irradiated with the laser light reaches a temperature equal to or higher than the melting point and sublimates, and a groove 40 having a V-shaped cross section is formed on the outer surface. The groove 40 includes a boundary portion between the opening end 22 of the mouth portion and the to-be-broken portion 30 (spherical portion 32) on a horizontal straight line perpendicular to the axis of the container and across the knob portions at both ends. Is formed. And since this groove | channel 40 is formed in the outer surface of this boundary part, since resin is thinned in the groove | channel 40, it becomes easy to fracture | rupture. For this reason, when the knob portion 34 is rotated or bent, the boundary portion between the opening end 22 of the mouth portion and the portion to be broken 30 (spherical portion 32) can be broken without difficulty to form the opening. .

  That is, in the container with a fractured portion made of polyester resin according to the present invention, the groove is formed in a direction substantially perpendicular to the outer surface of the boundary portion between the opening end of the mouth and the fractured portion. To do. In addition, the depth of the groove is not particularly limited, but in the normal case, the depth of the groove is preferably 30 to 90% of the thickness of the peripheral portion of the groove. Although it differs depending on the type of container, in the case of a general container, if the depth of the groove is less than 30% of the thickness of the peripheral portion of the groove, the effect due to the formation of the groove may not be obtained. If it exceeds, the film will become too thin and may be opened by a slight impact during transportation. In the present embodiment, the depth of the groove was 0.25 mm, which was about 31% of the thickness of the groove peripheral portion of 0.8 mm.

  Moreover, in the container 10 with a to-be-breakable part made from the polyester resin concerning one Embodiment of this invention, the through-hole 42 is in the thin part 36 of the both sides of the boundary part of the opening end 22 of a mouth part and the to-be-broken part 30. It may be formed, and by forming such a through hole 42, it becomes easier to break, and opening by twist-off or snap-off becomes easier.

<Intrinsic viscosity of polyester resin around the groove>
In the container 10 with a broken portion made of polyester resin according to one embodiment of the present invention, after the groove 40 is formed by irradiation with the carbon dioxide laser as described above, the groove 40 is rapidly cooled. Here, the polyester resin remaining without being sublimated in the peripheral portion of the groove 40 is melted by the irradiation of the laser beam, so that the intrinsic viscosity of the resin is lowered. As a result, the polyester resin becomes brittle at the peripheral portion of the groove and is easily broken.

  For this reason, in the container with a to-be-broken portion made of polyester resin according to the present invention, the intrinsic viscosity of the polyester resin in the groove peripheral portion is smaller than the intrinsic viscosity of the polyester resin other than the groove peripheral portion. More specifically, it is preferable that the intrinsic viscosity of the polyester resin in the peripheral portion of the groove is 10% or more lower than the intrinsic viscosity of the polyester resin other than the peripheral portion of the groove. In this embodiment, the intrinsic viscosity of the polyester resin in the groove peripheral portion is 0.85 dl / g, which is about 15% lower than the intrinsic viscosity of 1.0 dl / g in the polyester resin other than the groove peripheral portion. .

  Moreover, in the polyester resin to-be-ruptured container 10 according to an embodiment of the present invention, the polyester resin present in the peripheral portion of the groove 40 absorbs moisture in the air after being melted by the laser light irradiation. The molecular weight decreases due to hydrolysis. Thereby, the polyester resin becomes brittle and easily breaks.

<Polyester resin>
In the container with a broken portion made of polyester resin according to the present invention, the material of the container is polyester resin. Although it does not specifically limit as a polyester resin used for this invention, As a suitable example, an adipic acid, a terephthalic acid, 2, 6- naphthalene dicarboxylic acid, 4, 4- biphenyl is mentioned as an acid component, for example. One or two selected from carboxylic acid, oxalic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, dodecadioic acid, trans-1,4-cyclohexanedicarboxylic acid, isophthalic acid It consists of more than seeds, and glycol components include ethylene glycol, trimethylene glycol (1,3-propanediol), tetramethylene glycol (1,4-butanediol), pentamethylene glycol, hexamethylene glycol, 1,4-hexanediene. Methanol, bisphenol A, spiro It is a homopolyester resin or a copolyester resin composed of one or more selected from recall, and its intrinsic viscosity is 0.8 to 1.5 dl / g, preferably 0.8 to 1.3 dl / g. Of the polyester resin.

  As a preferable specific example of the polyester resin used in the present invention, for example, the acid component is terephthalic acid, and the diol component is 1,4-cyclohexanedimethanol or bisphenol A with respect to 96 mol% of ethylene glycol. Is a polyester resin to which 4 mol% is added. The polyester resin obtained above has an intrinsic viscosity of about 1.0 dl / g, does not draw down during direct blow molding, and has a melting point of about 235 to 245 ° C. Since it can be molded at a low temperature of 10 to 30 ° C., rapid cooling is possible. Furthermore, since the crystallization rate is slow, the moldability is good, and it is suitable as a polyester resin used in the present invention.

<Production method>
The method for manufacturing a container with a fractured portion made of polyester resin according to the present invention includes a groove that forms a groove by irradiating a laser in a substantially vertical direction with respect to the outer surface of the boundary portion between the opening end of the mouth and the fractured portion. The method includes a forming step and a rapid cooling step in which the groove is left to cool after the step.
The method for producing a container with a fractured part made of polyester resin according to the present invention is not particularly limited with respect to the other steps as long as it includes the above-mentioned steps, but heat seal molding may not be used. In this respect, the direct blow molding method is preferable.

FIG. 4 shows a method of manufacturing a container with a broken portion made of polyester resin according to one embodiment of the present invention using the direct blow molding method in the order of steps (a) to (f).
First, as shown in FIG. 4A, when the tube-shaped preform (usually called a parison) 52 extruded from the extruder 50 reaches a predetermined length, the bottom 12 of the polyester resin container The split body mold 54 formed on the inside of the outer surface shape of the body 18 composed of the rectangular parallelepiped portion 14 and the neck portion 16 and the split auxiliary mold 56 in contact with the outer surface of the preform 52 are simultaneously formed. Close and sandwich the preform 52. Then, as shown in FIG. 4B, the bottom of the preform 52 is sealed, and at the same time, the cutter 58 operates to cut the upper portion of the preform 52.

  As shown in FIG. 4C, the preform 12 is moved immediately after being cut, and the auxiliary mold 56 is covered with a lid 60 with a conduit, and compressed air such as compressed air of 10 atm is sterilized from the conduit. The pressurized fluid is blown into the preformed body 52, and the lower part of the preformed body 52 is molded into the body portion 18 including the bottom portion 12, the rectangular parallelepiped portion 14, and the neck portion 16 by the body portion mold 54. Subsequently, the lid 60 with the conduit is removed, and as shown in FIG. 4 (d), the filling nozzle 62 is inserted into the preformed body 52 in which the body portion 5 is formed, and a functional beverage, liquid medicine, etc. The contents of are filled.

  When the filling of the contents is completed, the filling nozzle 62 is extracted and the auxiliary mold 56 is opened, and as shown in FIG. 4 (e), the mouth portion 20, the spherical portion 32, the knob portion 34, and the thin portion 36. The fractured part molding die 64 in which the outer shape of the fractured part 30 is formed on the inside is closed, and a fractured structure is formed above the body part 18.

  As shown in FIG. 4 (f), the polyester resin container 10 in which the structure to be broken is formed is perpendicular to the axis of the container including the boundary portion between the opening end 22 of the mouth and the part to be broken 30. A carbon dioxide laser is irradiated on the horizontal straight line across the knobs at both ends. The portion irradiated with the laser light reaches a temperature equal to or higher than the melting point by the laser light irradiation, melts and sublimates, and the surface becomes a groove 40 extending horizontally with a V-shaped cross section. The laser beam may be irradiated from both sides as long as the outer surface of the boundary portion between the opening end 22 of the mouth portion and the portion to be broken 30 is irradiated. Further, the laser beam in this groove forming step is not particularly limited. For example, the laser beam having an output of 1.0 to 100 W and a laser beam diameter of 0.1 to 5.0 mm is moved at 10 to 500 mm / sec. It is preferable to irradiate. In this embodiment, laser light having an output of 30 W and a laser beam diameter of 0.2 mm is irradiated while being linearly moved at 20 to 25 mm / sec.

  Moreover, in the container 10 with a to-be-breakable part made from the polyester resin concerning one Embodiment of this invention, the laser beam of said aspect is followed along the horizontal line containing the boundary part of the opening end 22 of a mouth part and the to-be-broken part 30. As a result of the irradiation, through holes 42 are formed in the thin portions on both sides of the boundary portion. And by forming such a through-hole 42, it becomes easy to fracture | rupture and the opening by twist-off or snap-off becomes still easier. Note that the irradiated laser light may be spot-irradiated only on the boundary portion between the opening end 22 of the mouth portion and the to-be-broken portion 30, and can be appropriately changed.

  After the groove 40 is formed by the laser light irradiation as described above, the groove 40 is rapidly cooled by being left standing. In the rapid cooling step, for example, the temperature may be maintained at 0 to 50 ° C. for 0.1 to 30 seconds, preferably 10 to 20 ° C. for 5 to 10 seconds.

  According to the container with a fractured part made of polyester resin of the present invention produced as described above, a groove is formed by irradiating a laser on the outer surface of the boundary part between the opening end of the mouth and the fractured part, Further, by quenching thereafter, the resin is thinned in the groove, and further, the intrinsic viscosity of the resin in the peripheral part of the groove is reduced, so that the polyester resin becomes brittle in the peripheral part of the groove. A significantly improved container made of polyester resin with a fractured part is obtained.

It is a front view of the container with a to-be-ruptured part made from polyester resin concerning one Embodiment of this invention. It is a side view of the container with a to-be-rupture part made from a polyester resin concerning one Embodiment of this invention. It is a top view of the container with a to-be-rupture part made from a polyester resin concerning one Embodiment of this invention. It is the figure which showed the manufacturing method of the container with a to-be-breakable part made from a polyester resin concerning one Embodiment of this invention in order of a process.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Polyester resin container with torn part 12 Bottom part 14 Cuboid part 16 Portion neck part 18 Body part 20 Portion part 22 Open end 30 Part to be broken 32 Spherical part 34 Picking part 36 Thin part 40 Groove 42 Through-hole 50 Extruder 52 Preliminary Molded body 54 Body mold 56 Auxiliary mold 58 Cutter 60 Lid with conduit 62 Filling nozzle 64 Fracture part molding mold

Claims (10)

The container is made of polyester resin, and is integrally provided with a mouth part continuous with the container body and a breakable part located above the mouth part, and a boundary part between the open end of the mouth part and the breakable part In a container having a ruptured structure that breaks and opens,
A groove is formed in a direction substantially perpendicular to the outer surface of the boundary portion between the opening end of the mouth and the portion to be broken,
A container with a broken portion made of polyester resin, wherein the intrinsic viscosity of the polyester resin in the peripheral portion of the groove is smaller than the intrinsic viscosity of the polyester resin other than the peripheral portion of the groove. In the container with a torn portion made of polyester resin according to claim 1,
A container with a broken portion made of polyester resin, wherein the depth of the groove is 30 to 90% of the thickness of the peripheral portion of the groove. In the container with a torn portion made of polyester resin according to claim 1 or 2,
A container with a broken portion made of polyester resin, wherein the intrinsic viscosity of the polyester resin in the peripheral portion of the groove is 10% or more lower than the intrinsic viscosity of the polyester resin other than the peripheral portion of the groove. In the container with a fractured part made of polyester resin according to any one of claims 1 to 3,
The polyester resin has acid components such as adipic acid, terephthalic acid, 2,6-naphthalenedicarboxylic acid, 4,4-biphenylcarboxylic acid, oxalic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, and azelain. It consists of one or more selected from acid, sebacic acid, dodecadioic acid, trans-1,4-cyclohexanedicarboxylic acid, and isophthalic acid. As the glycol component, ethylene glycol, trimethylene glycol (1,3-propanediol) ), Tetramethylene glycol (1,4-butanediol), pentamethylene glycol, hexamethylene glycol, 1,4-hexanedimethanol, bisphenol A, and spiroglycol homopolyester resin , Ma Copolymerized a polyester resin, a polyester resin to be broken part with the container, characterized in that the intrinsic viscosity of polyester resin 0.8~1.5dl / g is. In the container with a fractured part made of polyester resin according to any one of claims 1 to 4,
A bottom part, a trunk part composed of a rectangular parallelepiped part and a mouth and neck part, a mouth part continuous with the mouth and neck part, a spherical part located above the mouth part, a plate-shaped knob part and a thin part; The rupture part is integrally provided, the opening end of the mouth part is sealed by the spherical part, the knob part is continuous with the mouth part through a thin part, and the knob part straddles the mouth part A groove is formed across the knobs at both ends on a horizontal straight line that hangs down to the mouth and neck and is perpendicular to the axial direction of the container including the boundary between the opening end of the mouth and the portion to be broken. A container with a torn portion made of polyester resin. The container is made of polyester resin, and is integrally provided with a mouth part continuous with the container body and a breakable part located above the mouth part, and a boundary part between the open end of the mouth part and the breakable part In the method of manufacturing a container having a ruptured structure that breaks and opens, at least the outer surface of the boundary between the opening end of the mouth and the ruptured part is irradiated with a laser in a direction substantially perpendicular to the groove. A groove forming step to be formed;
A method for producing a container with a broken portion made of a polyester resin, comprising: a quenching step in which the groove is left to cool after the step. In the manufacturing method of the container with a fractured part made of polyester resin according to claim 6,
The groove forming step is performed by irradiating a laser beam having an output of 1.0 to 100 W and a laser beam diameter of 0.1 to 5.0 mm at 10 to 500 mm / sec. Container manufacturing method.   In the manufacturing method of the container with a rupture part made of polyester resin according to claim 6 or 7, the rapid cooling step is held at 0 to 50 ° C for 0.1 to 30 seconds, with the rupture part made of polyester resin Container manufacturing method. In the manufacturing method of the container with a torn part made of polyester resin according to any one of claims 6 to 8,
The polyester resin has acid components such as adipic acid, terephthalic acid, 2,6-naphthalenedicarboxylic acid, 4,4-biphenylcarboxylic acid, oxalic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, and azelain. It consists of one or more selected from acid, sebacic acid, dodecadioic acid, trans-1,4-cyclohexanedicarboxylic acid, and isophthalic acid. As the glycol component, ethylene glycol, trimethylene glycol (1,3-propanediol) ), Tetramethylene glycol (1,4-butanediol), pentamethylene glycol, hexamethylene glycol, 1,4-hexanedimethanol, bisphenol A, and spiroglycol homopolyester resin Or The polymerization is a polyester resin, a manufacturing method of a polyester resin to be broken part with the container, characterized in that the intrinsic viscosity of polyester resin 0.8~1.5dl / g. In the manufacturing method of the container with a fracture part made of polyester resin according to any one of claims 6 to 9, a preformed body extrusion step of further extruding a polyester resin preform from an extruder,
A cylinder bottom portion forming step of sandwiching the preform with a mold and sealing the bottom portion with a palm, and allowing a pressure fluid to flow in from the open end to form a trunk portion and a bottom portion of the preform, and
A content filling step of filling the contents into the barrel from the open end of the preform;
With a ruptured structure made of polyester resin, comprising a step of forming a ruptured structure in which the preform is sandwiched between molds and the upper part is held to form a mouth and a ruptured part at the upper part of the preform. Container manufacturing method.

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