JP2014227206A - Cylindrical container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cylindrical container excellent in non-adsorptivity to an organic compound having low molecular weight included in the content.SOLUTION: A cylindrical container 1 comprises: a trunk 2 to which both edges 21, 21' of a film 20 are deposited; a lid part 3 formed by depositing a lid member 30 to one end 22 of both ends 22, 22' of the trunk 2 in a vertical direction; and a bottom part 5 formed on the other end 22' of both ends 22, 22' of the trunk 2. The lid member 30 has a cylindrical mouth 4, and an inner face of the trunk 2 is formed of a resin including an isophthalic acid modified polyethylene terephthalate or a resin including a glycol modified polyethylene terephthalate. Inner faces of the lid part 3 and the bottom part 5 are formed of the resin including an isophthalic acid modified polyethylene terephthalate or the resin including a glycol modified polyethylene terephthalate. Thereby the problem is solved.

Description

  The present invention relates to a cylindrical container. More specifically, the present invention relates to a refillable cylindrical container that is excellent in non-adsorbability for low molecular weight organic compounds.

  Cylindrical containers are used as refill containers for food, drink, cosmetics, drugs, and the like. Such a cylindrical container is attached to a hard outer container in a state where the contents are filled, and is removed when the contents are exhausted, and is replaced with a new cylindrical container filled with the contents. Therefore, since the outer container can be used repeatedly, the amount of dust can be reduced. Moreover, it becomes possible to reduce the volume of garbage by comprising the cylindrical container with a flexible material such as a film.

  Patent Document 1 describes a technique relating to a plastic container that can be used as a refill container for lotion, soy sauce, or the like. This technology consists of an intermediate barrel formed of a plastic laminate film in a cylindrical shape, a bottom integrally joined to the lower end inner surface of the intermediate barrel by insert injection molding means, and an insert injection molding on the upper end outer surface of the intermediate barrel. It is constituted by an annular portion integrally coupled by means and an upper lid having a mouth portion coupled to the upper end surface of the annular portion. According to this technique, it is said that the rigidity of the bottom portion can be secured, and the plastic container can be free from risks such as pinhole leakage at the bottom portion.

  Patent Document 2 discloses a spout in which a lid is formed of a synthetic resin molded body having a shape retaining property and a spout serving as a spout is attached to the lid of a container body formed of a flexible synthetic resin sheet. Techniques related to the attached container are described. According to this technique, since the lid portion to which the spout is attached is formed of a synthetic resin molded body having shape retention, the barrel portion is formed by thermally welding the peripheral wall of the lid portion to the opening portion of the barrel member. It is said that the opening is securely held in an open state, and the inner volume of the body can be sufficiently secured.

JP 2001-278292 A JP 2001-151249 A JP 2010-188613 A

  However, as for the container of patent documents 1 and 2, the trunk | drum, the bottom part, and the cover part are all shape | molded with polyolefin resin. Since such polyolefin resin has many gaps in the molecular structure, low molecular weight organic compounds tend to enter the gaps. Therefore, the container has a low non-adsorption property with respect to the low molecular weight organic compound, and the low molecular weight organic compound contained in the contents is easily adsorbed on the inner surface of the container. As a result, the aromatic component, which is a low molecular weight organic compound contained in food or drink, is adsorbed on the inner surface of the container and the flavor of the food or drink changes, or the active ingredient contained in a drug or the like is a low molecular weight organic compound. In this case, there is a problem that the active ingredient is adsorbed on the inner surface of the container and the efficacy of the medicine or the like is lowered. Further, when the adsorption of the low molecular weight organic compound is caused to penetrate deep into the inner surface of the container, when the body of the container is formed of a plurality of layers, the adhesion strength between the layers is reduced and delamination ( Peeling) may occur.

  On the other hand, the present inventor relates to a laminated film having a sealant layer formed of an isophthalic acid-modified polyethylene terephthalate resin, a polyolefin resin, and a reactive compatibilizer having an epoxy group in Patent Document 3 so far. Proposing technology. According to this technology, since it is excellent in non-adsorption to low molecular weight organic compounds and can secure strong heat seal strength, a large flexible packaging bag capable of containing contents containing low molecular weight organic compounds is provided. Can be manufactured.

  An object of the present invention is to provide a cylindrical container excellent in non-adsorbability with respect to a low molecular weight organic compound in the contents.

  In order to solve the above problems, a cylindrical container according to the present invention includes a barrel portion on which both edges of a film are welded, and a lid portion formed by welding lid members on one end of both ends in the vertical direction of the barrel portion. And a bottom portion formed at the other end of the both ends of the barrel portion, the lid member has a cylindrical mouth portion, and an inner surface of the barrel portion includes a resin containing isophthalic acid-modified polyethylene terephthalate or It is formed of a resin containing glycol-modified polyethylene terephthalate, and the inner surface of the lid and the inner surface of the bottom are formed of a resin containing isophthalic acid-modified polyethylene terephthalate or a resin containing glycol-modified polyethylene terephthalate.

  According to this invention, the inner surface of the body portion is formed of a resin containing isophthalic acid-modified polyethylene terephthalate or a resin containing glycol-modified polyethylene terephthalate, and the inner surface of the lid portion and the inner surface of the bottom portion are formed of the above resin. The entire inner surface of the container is formed of a resin having a molecular structure with few gaps. As a result, the low molecular weight organic compound can be prevented from being adsorbed on the inner surface of the cylindrical container, and the non-adsorption property for the low molecular weight organic compound can be enhanced.

  In the cylindrical container according to the present invention, the glass transition point (Tg) of the resin containing isophthalic acid-modified polyethylene terephthalate is 80 ° C. or more and 85 ° C. or less, and the glass transition point of the resin containing glycol-modified polyethylene terephthalate ( Tg) is preferably 60 ° C. or higher and 65 ° C. or lower.

  According to this invention, the glass transition point (Tg) of the resin containing isophthalic acid-modified polyethylene terephthalate is 80 ° C. or higher and 85 ° C. or lower, and the glass transition point (Tg) of the resin containing glycol-modified polyethylene terephthalate is 60 ° C. or higher. Since the temperature is 65 ° C. or lower, the fluidity of the resin constituting the entire inner surface of the cylindrical container is low even in a high temperature environment of about 40 ° C., and a molecular structure with few gaps is maintained. As a result, the non-adsorption property with respect to the low molecular weight organic compound can be maintained even in a high temperature environment.

  The cylindrical container which concerns on this invention WHEREIN: The said bottom part can be comprised so that a bottom member may be formed by welding to the other end of the said both ends of the said trunk | drum.

  In the cylindrical container according to the present invention, the lid member and the bottom member can be configured to be formed by an injection molding method.

  According to the cylindrical container according to the present invention, the non-adsorption property for the low molecular weight organic compound in the contents can be enhanced.

It is a perspective view which shows an example of the cylindrical container which concerns on this invention. It is a perspective view for demonstrating each part which comprises the cylindrical container which concerns on this invention. It is a top view which shows the example of the formation method of a trunk | drum. It is the front view (A) which shows an example of the cylindrical container which concerns on this invention, and A-A 'sectional drawing (B). It is the front view which shows an example of a cover member, and a top view (AD).

  Hereinafter, the cylindrical container according to the present invention will be described in detail with reference to the drawings. The present invention can be modified in various ways as long as it has the technical features, and is not limited to the embodiments specifically shown below.

[Cylinder container]
As shown in FIGS. 1 and 2, the cylindrical container 1 according to the present invention has a barrel portion 2 on which both edges 21 and 21 ′ of the film 20 are welded, and both ends 22 and 22 in the vertical direction of the barrel portion 2. The lid portion 3 is formed by welding a lid member 30 to one end 22 of “′”, and the bottom portion 5 is formed at the other ends 22 ′ of both ends 22, 22 ′ of the body portion 2. The lid member 30 has a cylindrical mouth portion 4.

  In the cylindrical container 1, the inner surface of the body portion 2 is a resin containing isophthalic acid-modified polyethylene terephthalate (hereinafter also referred to as “isophthalic acid-modified PET”) or glycol-modified polyethylene terephthalate (hereinafter also referred to as “glycol-modified PET”). .). Further, the inner surface of the lid portion 3 and the inner surface of the bottom portion 5 are formed of a resin containing isophthalic acid-modified PET or a resin containing glycol-modified PET.

  Since the inner surface of each part constituting the cylindrical container 1 is formed of the resin, the entire inner surface of the cylindrical container 1 is formed of a resin having a molecular structure with few gaps. As a result, the low molecular weight organic compound can be prevented from being adsorbed on the inner surface of the cylindrical container, and the non-adsorption property for the low molecular weight organic compound can be enhanced. “Non-adsorptive” means that the low molecular weight organic compound contained in the contents is prevented from being adsorbed on the inner surface of the cylindrical container 1, and the low molecular weight organic compound is deep inside the cylindrical container 1. (That is, the film 20, the lid member 30 or the bottom member 50 constituting the body 2, the lid 3 or the bottom 5) and the adsorption is suppressed.

  Hereinafter, each configuration will be described in detail. In the present application, “both edges” of the film 20 are both edge portions of the film 20 that are overlapped when the body portion 2 is formed, and “both ends” of the body portion 2 are those of the body portion 2. It means both ends in the vertical direction. The “inner surface” refers to a surface in contact with the contents.

(Torso)
As shown in FIGS. 2 and 3, the body 2 is formed by welding both edges 21 and 21 ′ of the film 20. At least one end 22 of the upper and lower ends 22, 22 ′ of the body portion 2 is open, and a lid 3 described later is formed in the opening. When the bottom 5 described later is formed by the bottom member 50, both ends 22 and 22 'in the vertical direction of the body 2 are open, and the lid 3 and the bottom 5 are formed in the openings, respectively.

  The inner surface of the body part 2 is formed of a resin containing isophthalic acid-modified PET or a resin containing glycol-modified PET. “Contains” means that other resins, additives, and the like can be included as necessary within a range not impairing the non-adsorption property. Examples of other resins that can be included as necessary include low-density polyethylene (hereinafter referred to as “LDPE”), linear low-density polyethylene (hereinafter referred to as “LDPE”) for the purpose of improving weldability and flexibility. Hereinafter, it is referred to as “L-LDPE”). Examples of the additive include an antioxidant, a lubricant, an antiblocking agent, a flame retardant, an ultraviolet absorber, a light stabilizer, an antistatic agent, and a colorant. Since the trunk | drum 2 is formed with the film 20, as shown in FIG. 3, when the inner surface S1 of the film 20 is formed with the said resin, the inner surface of the trunk | drum 2 can be formed with the said resin. it can.

  The film 20 is a heat-sealable plastic film, and may be formed of a single layer or a plurality of layers. When the film 20 is formed of a single layer, the inner surface of the body portion 2 can be formed of the resin by forming the film 20 with a resin containing isophthalic acid-modified PET or a resin containing glycol-modified PET. . In addition, when the film 20 is formed of a plurality of layers, as shown in FIGS. 3 (B-1 and B-2), a two-layer configuration of an innermost layer and an outermost layer may be used. And as shown to C-2), the structure of three or more layers which have an intermediate | middle layer may be sufficient. By forming a layer (innermost layer) that becomes the inner surface when the film 20 formed of such a plurality of layers is formed into a cylindrical shape with a resin containing isophthalic acid-modified PET or a resin containing glycol-modified PET, its body part 2 inner surface can be formed with the said resin.

  Isophthalic acid-modified PET is a polyethylene terephthalate containing terephthalic acid as a dicarboxylic acid component and ethylene glycol as a diol component among linear polyester resins obtained by condensation polymerization of a dicarboxylic acid component and a diol component. It further contains isophthalic acid as a component. The copolymerization ratio of isophthalic acid in isophthalic acid-modified PET is preferably 3 mol% or more and 30 mol% or less. By making the copolymerization ratio of isophthalic acid within this range, it is possible to improve the balance between non-adsorbing property and heat welding property.

  Glycol-modified PET is a polyethylene terephthalate containing terephthalic acid as a dicarboxylic acid component and ethylene glycol as a diol component among linear polyester resins obtained by condensation polymerization of a dicarboxylic acid component and a diol component, Furthermore, cyclohexanedimethanol is included. The copolymerization ratio of cyclohexanedimethanol in glycol-modified PET is preferably 10 mol% or more and 45 mol% or less. By setting the copolymerization ratio of cyclohexanedimethanol within this range, it is possible to improve the balance between non-adsorption and thermal weldability.

  The glass transition point (Tg) of the resin is from 80 ° C. to 85 ° C. for resins containing isophthalic acid-modified PET, and from 60 ° C. to 65 ° C. for resins containing glycol-modified PET. By setting the glass transition point (Tg) of the resin within this range, the fluidity of the resin constituting the entire inner surface of the cylindrical container is low even in a high temperature environment of about 40 ° C., and a molecular structure with few gaps is maintained. The As a result, the non-adsorption property with respect to the low molecular weight organic compound can be maintained even in a high temperature environment. The glass transition point (Tg) is a value measured by a plastic transition temperature measurement method according to JIS-K7121 using a differential thermal analyzer.

  The content of isophthalic acid-modified PET or glycol-modified PET in the resin is 70% by mass or more and 100% by mass or less, and preferably 80% by mass or more and 100% by mass or less. By setting the content of isophthalic acid-modified PET or glycol-modified PET in the resin within the above range, the non-adsorption property of the cylindrical container 1 can be further increased.

  The temperature at which the resin melts is 235 ° C. or more and 245 ° C. or less for a resin containing isophthalic acid-modified PET having a glass transition point of 80 ° C. or more and 85 ° C. or less, and the glass transition point is 60 ° C. or more and 65 ° C. The following resin containing glycol-modified PET is 240 ° C. or higher and 260 ° C. or lower.

  The thickness of the film 20 is 5 μm or more and 150 μm or less, preferably 15 μm or more and 80 μm or less, and other layers when formed of a plurality of layers. The thickness of is not particularly limited. By making the thickness of the layer formed of the resin within this range, the non-adsorption property can be further increased.

  When the film 20 is formed of a plurality of layers, the material of the outermost layer is not particularly limited. For example, in consideration of mechanical properties such as heat resistance or strength required for the body portion 2 and printability, Biaxially stretched polyethylene terephthalate (O-PET) film, biaxially stretched nylon (O-Ny) film, biaxially stretched polypropylene (OPP) film, and the like can be given. Further, the outermost layer of the film 20 can be configured to be formed of a resin containing isophthalic acid-modified PET or a resin containing glycol-modified PET, as in the case of the innermost layer of the film 20. Suitable for

  Moreover, the film 20 formed of a plurality of layers may have, for example, a gas barrier layer or a reinforcing layer as an intermediate layer. The gas barrier layer is a layer having a function of preventing a gas such as oxygen or water vapor from passing through the film 20. For example, a metal foil, a vapor deposition layer of aluminum or an inorganic oxide, an ethylene-vinyl alcohol copolymer (EVOH) Alternatively, it is formed of a gas barrier resin layer such as vinylidene chloride. When formed of a metal foil or a gas barrier resin layer, the thickness of the gas barrier layer is usually 5 μm or more and 50 μm or less, preferably 10 μm or more and 30 μm or less, and an aluminum or inorganic oxide deposition layer Can be made thinner than that. Such a gas barrier layer can be provided on one side of the outermost layer or the reinforcing layer of the film 20. When the gas barrier layer is formed of an inorganic oxide vapor-deposited layer, it can be provided not as an intermediate layer but as an outermost layer of the outermost layer of the film 20.

  The reinforcing layer is a layer having an effect of complementing the strength characteristics of the film 20, and is a polyolefin resin layer such as polypropylene (PP) or polyethylene (PE), or biaxially stretched polyethylene terephthalate (O-PET), biaxial. It is formed of a stretched nylon (O—Ny) or biaxially stretched polypropylene (OPP) resin layer. The thickness of the reinforcing layer is usually 5 μm or more and 50 μm or less, preferably 10 μm or more and 30 μm or less.

  The production method of the film 20 is not particularly limited, and the film 20 composed of one layer or a plurality of layers can be produced by an extrusion laminating method, a dry laminating method, a coextrusion method, or a combination thereof.

  The body portion 2 is formed by welding both edges 21 and 21 ′ of such a film 20. In the welding, the both edges 21 and 21 ′ of the film 20 are superposed and heated and bonded by heat sealing. Examples of the heat seal include a bar seal, a rotary roll seal, a belt seal, an impulse seal, a high frequency seal, and an ultrasonic seal.

  As shown in FIG. 3 (A-1, B-1, and C-1), the method of superimposing the outer surface S2 (or T2, U2) of the film 20 and the inner surface S1 is overlapped at both edges 21, 21 ′. So-called envelope pasting which is welded together may be used, and as shown in FIG. 3 (A-2, B-2 and C-2), the inner surfaces S1 of the film 20 are overlapped and welded at both edges 21 and 21 ′. , So-called gassho sticking may be used. The method of superimposing can be appropriately selected depending on the layer structure of the film 20 and the like. The width (hereinafter also referred to as “welding width”) L2 for overlapping and joining is usually 3 mm or more and 30 mm or less, and preferably 5 mm or more and 20 mm or less. In addition, as shown to FIG. 3 (D-1 and D-2), the trunk | drum 2 can also form and form the film 20 of several sheets, and in this case, the film of a different layer structure is required as needed. It can also be used. The number of the films 20 in the case of forming a plurality of films 20 by joining them can be selected as appropriate, and can be formed by two or three or more.

(Cover)
As shown in FIGS. 1 and 2, the lid portion 3 is formed by welding a lid member 30 to one end 22 of both ends 22, 22 ′ in the vertical direction of the body portion 2, and has a function of sealing the one end 22. . The lid part 3 has a cylindrical mouth part 4 to be described later. The inner surface of the lid 3 is formed of a resin containing isophthalic acid-modified PET or a resin containing glycol-modified PET. Since the lid 3 is formed of the lid member 30, the lid member 30 is formed of a resin containing isophthalic acid-modified PET or a resin containing glycol-modified PET, so that the inner surface of the lid 3 is the above resin. Can be formed. Note that isophthalic acid-modified PET, glycol-modified PET, resins containing them, and other resins and additives contained as necessary are the same as those of the body 2 described above, and are therefore omitted here. .

  The shape of the lid member 30 is not particularly limited. For example, as the planar shape, a donut shape having a substantially circular shape, a substantially elliptical shape, or a substantially polygonal shape can be exemplified as shown in FIG. A plate shape in which a cylindrical mouth portion 4 to be described later protrudes in part can be mentioned. The width of the lid member 30 is a length L4 that connects the farthest points on the outer periphery of the planar shape so that the lid member 30 can be welded in a state where the lid member 30 is inserted into the open one end 22 of the body 2. (Refer to FIG. 2) is preferably 100 μm or more and 1000 μm or less smaller than the open end 22 ′ of the body 2. The thickness L5 (thickness of the portion other than the mouth portion 4) of the lid member 30 is usually 3 mm or more and 30 mm or less, preferably 5 mm or more and 20 mm or less.

  The lid member 30 has a cylindrical mouth portion 4 as shown in FIGS. 1, 2, and 4. Both ends of the mouth part 4 are open, one end communicates with the inside of the cylindrical container 1, and the other end protrudes outside the cylindrical container. The mouth portion 4 has an effect of discharging the contents of the cylindrical container 1 to the outside, and also acts as an inlet when the contents are injected after the cylindrical container 1 is manufactured.

  The length L6 of the portion protruding outside the mouth portion 4 is not particularly limited, and is, for example, 10 mm or more and 30 mm or less. The inner diameter L7 is not particularly limited, and is, for example, 5 mm or more and 20 mm or less. Moreover, as shown in FIG.4 and FIG.5, the opening part 4 may be provided with the thread 6 for mounting | wearing with the attachment which makes it easy to pour out the contents as needed, such as packing. A convex portion may be provided.

Such a manufacturing method of the lid member 30 can be manufactured integrally with the mouth portion 4 by an injection molding method. Specifically, the resin is heated to a temperature equal to or higher than the melting temperature of the resin (for example, 220 ° C. or higher and 350 ° C. or lower in the case of isophthalic acid-modified PET, 220 ° C. or higher and 350 ° C. in the case of glycol-modified PET. And the like, and an injection pressure (for example, 10 kgf / cm ² or more and 3000 kgf / cm ² or less) is applied to a mold having a desired shape to obtain a mold.

  The lid 3 is formed by welding the above-described lid member 30 to the open one end 22 of both ends 22, 22 ′ in the vertical direction of the body 2. As shown in FIG. 1 and FIG. 2, the welding is heat-sealed and joined in a state where the outer surface (outer peripheral surface) of the lid member 30 and the inner surface of the open end 22 of the body portion 2 are in contact with each other. It is preferable. Since the kind of heat seal is the same as that of the body 2 described above, the description is omitted here. The welding width is usually 3 mm or more and 30 mm or less, preferably 5 mm or more and 20 mm or less.

(bottom)
The bottom 5 is provided at one end 22 ′ on the opposite side of the upper and lower ends 22, 22 ′ of the body 2, where the lid 3 is formed, and has a function of sealing the one end 22 ′. The bottom 5 may be formed by welding one end 22 'of the body 2 to each other. As shown in FIGS. 1 and 2, the bottom 5 is formed by welding a bottom member 50 to the opened one end 22' of the body 2. May be. The inner surface of the bottom 5 is formed of a resin containing isophthalic acid-modified PET or a resin containing glycol-modified PET.

  The inner surface S1 of the film 20 contains isophthalic acid-modified PET in the same manner as the inner surface of the body 2 when the bottom 5 is formed by welding the ends 22 'of the body 2 together. By forming with resin or resin containing glycol modified PET, the inner surface of the bottom part 5 can be formed with the said resin. When the bottom 5 is formed of the bottom member 50, the bottom member 50 is formed of a resin containing isophthalic acid-modified PET or a resin containing glycol-modified PET, so that the inner surface of the bottom 5 is made of the resin. Can be formed.

  Regarding the resin containing isophthalic acid-modified PET, the resin containing glycol-modified PET, and their glass transition point (Tg), and other resins and additives contained as necessary, the above-described body 2 and Since it is the same, description is abbreviate | omitted here.

  The shape of the bottom member 50 is not particularly limited. For example, the planar shape can be a substantially circular shape, a substantially elliptical shape, or a substantially polygonal shape, and the front shape can be a plate shape. The width of the bottom member 50 is not particularly limited. For example, the length L8 (see FIG. 2) connecting the farthest points on the outer periphery of the planar shape can be the same as that of the lid member 30 described above. The thickness L9 of the bottom member 50 is usually 3 mm or more and 30 mm or less, preferably 5 mm or more and 20 mm or less. The manufacturing method of such a bottom member 50 is not specifically limited, For example, it can manufacture by the injection molding method similarly to the above-mentioned lid member 30.

  The method of forming the bottom 5 may be formed by welding in a state where the one ends 22 'of the body 2 are overlapped. When using the bottom member 50, the outer surface (outer peripheral surface) of the bottom member 50 and It may be formed by welding in such a state that the inner surface of one end 22 ′ of the body portion 2 is in contact with the inner surface. Welding is performed by heat sealing. About the kind of heat seal, since it is the same as the above-mentioned trunk | drum 2, the description is abbreviate | omitted here. Moreover, about the welding width | variety, it can be made the same as the above-mentioned cover part 3. FIG.

(Contents)
The content of the cylindrical container 1 is not specifically limited, For example, the food / beverage products, cosmetics, a chemical | medical agent, etc. which contain the fragrance | flavor and active ingredient which are low molecular weight organic compounds can be mentioned. Since the cylindrical container 1 is excellent in non-adsorbing property, the low molecular weight organic compound contained in the contents is adsorbed by the cylindrical container 1, and the flavor of the contents is changed or the efficacy is reduced. Can be prevented.

(Tubular container)
As described above, the cylindrical container 1 is excellent in non-adsorbability with respect to a low molecular weight organic compound. Examples of the combination of the body part 2, the lid part 3, and the bottom part 5 that constitute such a cylindrical container 1 include the following examples.

  (1) Body 2 formed with film 20 (isophthalic acid copolymerization ratio: 20 mol%, glass transition point: 80 ° C.) formed of isophthalic acid-modified PET, and isophthalic acid-modified PET (isophthalic acid copolymerization ratio) : 20 mol%, glass transition point: 80 ° C.) obtained by injection molding at 280 ° C., an example comprising the lid portion 3 and the bottom portion 5 formed by the lid member 30 and the bottom member 50,

  (2) An innermost layer formed of a resin containing 98% by mass of isophthalic acid-modified PET (isophthalic acid copolymerization ratio: 20 mol%, glass transition point: 85 ° C.) and 2% by mass of an antioxidant as an additive. 95% by mass of the body 2 formed of the film 20 having the outermost layer formed of polyethylene terephthalate and glycol-modified PET (cyclohexanedimethanol copolymerization ratio: 30 mol%, glass transition point: 60 ° C.) An example comprising a lid 3 and a bottom 5 formed of a lid member 30 and a bottom member 50 obtained by injection molding at 290 ° C. a resin containing 5% by mass of an antioxidant as an additive,

  (3) It has an innermost layer formed of a resin containing 90% by mass of isophthalic acid-modified PET (isophthalic acid copolymerization ratio: 20 mol%, glass transition point: 70 ° C.) and 10% by mass of L-LDPE, The body 2 formed of the film 20 having the outermost layer formed of polyethylene terephthalate and the glycol-modified PET (cyclohexanedimethanol copolymerization ratio: 30 mol%, glass transition point: 50 ° C.) are injection-molded at 280 ° C. The example comprised by the cover part 3 and the bottom part 5 which were formed with the cover member 30 and the bottom member 50 which were obtained in this way, etc. can be mentioned.

  In addition, the cylindrical container 1 can be formed by heat-sealing the inner surface of the container even if it does not include other components that are easily heat-welded by being configured as follows. The content ratio of isophthalic acid-modified PET or glycol-modified PET can be further increased, and non-adsorption property can be further increased.

  For example, the cylindrical container 1 may be configured such that the inner surface of the copper portion 2, the outer surface (outer peripheral surface) of the lid portion 3, and the outer surface (outer peripheral surface) of the bottom portion 5 are all formed of the same resin. it can. By setting it as such a structure, the trunk | drum 2 and the cover member 30, the trunk | drum 2 and the bottom member 50 become easy to heat-seal | fade respectively. As a result, these parts do not have to contain other components that are likely to be thermally welded to each other, and the content ratio of isophthalic acid-modified PET or glycol-modified PET in the resin is increased to reduce the low molecular weight organic content. The non-adsorption property to the compound can be further increased. In addition, LDPE, L-LDPE, etc. can be mention | raise | lifted as another component contained in order that each part becomes easy to heat-weld.

  Furthermore, as described above, when the barrel portion 2 is formed of the film 20 having a plurality of layers, the cylindrical container 1 is a resin or glycol-modified PET in which the outermost layer of the film 20 includes isophthalic acid-modified PET. It can be comprised as formed with resin containing. By adopting such a configuration, not only the innermost layer of the film 20 but also the outermost layer is formed of the resin. Therefore, the outer surface T2 or U2 of the outermost layer of the film 20 as shown in FIG. 3 (A1, B1, and C1). When the body 2 is formed by so-called “envelope sticking”, in which the inner surface S1 of the innermost layer is overlapped and welded, the outer surface T2 or U2 and the inner surface S1 are easily heat-welded. As a result, the inner surface of the body portion 2 does not need to contain other components that are likely to be thermally welded, and the content ratio of isophthalic acid-modified PET or glycol-modified PET in the resin is increased to reduce the low molecular weight organic compound. Non-adsorbability can be further increased.

[Method of manufacturing cylindrical container]
The manufacturing method of the cylindrical container 1 includes a step of preparing the film 20, the lid member 30 and the bottom member 50, a step of welding both edges 21 and 21 ′ of the film 20, and a body portion 2. The lid member 30 is welded to the opened one end 22 to form the lid portion 3, and the bottom portion 5 is formed to the other end 22 ′. The lid member 30 includes the cylindrical mouth portion 4. And the inner surface of the body portion 2 is formed of a resin containing isophthalic acid-modified polyethylene terephthalate or a resin containing glycol-modified polyethylene terephthalate, and the inner surfaces of the lid portion 3 and the bottom portion 5 are resins or glycols containing isophthalic acid-modified polyethylene terephthalate. It is formed of a resin containing modified polyethylene terephthalate.

  In the step of preparing the film 20, the lid member 30, and the bottom member 50, each member may be manufactured and prepared by the manufacturing method described above, or a commercially available film, bottom member, and lid member may be used. The formation order of the trunk | drum 2, the cover part 3, and the bottom part 5 may form the bottom part 5 after forming the trunk | drum 2 and the cover part 3, and forms the lid | cover part 3 after forming the trunk | drum 2 and the bottom part 5. May be. Moreover, the manufacturing method of the cylindrical container 1 may have the process of putting the contents in the cylindrical container 1 further. The step may be included after the bottom portion 5 forming step and before the lid portion 3 forming step, or after the bottom portion 5 forming step and the lid portion 3 forming step. In addition, since the formation method of the trunk | drum 2, the cover part 3, and the bottom part 5 is the same as above-mentioned [tubular container], description is abbreviate | omitted here.

  As described above, according to the cylindrical container 1 according to the present invention, the inner surface of the body portion 2 is formed of a resin containing isophthalic acid-modified polyethylene terephthalate or a resin containing glycol-modified polyethylene terephthalate, and the inner surfaces of the lid portion 3 and the bottom portion 5 are as described above. Since it is formed of resin, the entire inner surface of the cylindrical container 1 is formed of resin having a molecular structure with few gaps. As a result, it is possible to suppress the cylindrical container from adsorbing the low molecular weight organic compound, and it is possible to increase the non-adsorption property to the low molecular weight organic compound.

DESCRIPTION OF SYMBOLS 1 Cylindrical container 2 trunk | drum 3 lid | cover part 4 mouth part 5 bottom part 6 thread 20 film 21,21 'edge part 22 and 22' edge part of trunk | drum 30 lid member 50 bottom member

L1 Body length L2 Welding width L3 Body inner diameter L4 Lid member width L5 Thickness of lid member other than mouth L6 Protruding length of L7 L7 Inner diameter L8 Bottom member width L9 Bottom member Thickness S1 Inner surface of the film S2, T2, U2 Outer surface of the film

Claims (4)

A body part in which both edges of the film are welded, a lid part formed by welding lid members on one end of both ends in the vertical direction of the body part, and a bottom part formed on the other end of the body part And the lid member has a cylindrical mouth portion,
The inner surface of the body is formed of a resin containing isophthalic acid-modified polyethylene terephthalate or a resin containing glycol-modified polyethylene terephthalate,
An inner surface of the lid part and an inner surface of the bottom part are formed of a resin containing isophthalic acid-modified polyethylene terephthalate or a resin containing glycol-modified polyethylene terephthalate.   The glass transition point (Tg) of the resin containing isophthalic acid-modified polyethylene terephthalate is 80 ° C. or higher and 85 ° C. or lower, and the glass transition point (Tg) of the resin containing glycol-modified polyethylene terephthalate is 60 ° C. or higher and 65 ° C. or lower. The cylindrical container according to claim 1, wherein   The cylindrical container according to claim 1 or 2, wherein the bottom portion is formed by welding a bottom member to the other end of each end of the body portion.   The cylindrical container according to claim 3, wherein the lid member and the bottom member are formed by an injection molding method.

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