JP2008007146A - Transparent lid material for polyester resin container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transparent lid material for a polyester resin container, which is suitable for hermetic packaging for a medical device such as a syringe, in particular, makes it possible to accurately view a stored object on account of the transparent lid material tightly closed by heat seal, can be easily opened, and leaves an evidence at an opening section when opened. <P>SOLUTION: The transparent lid material for the polyester resin container is joined to the polyester resin container by being heat-sealed thereto and tightly closes the opening of the container. The substrate of the transparent lid material is formed by sequentially laminating a film layer of a polyethylene resin, a base layer of a urethane resin lacquer, and a heat seal layer of a polyester resin fat and a urethane resin lacquer. The heat seal layer is cohesive released. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a transparent lid material for a polyester-based resin container suitable for sealed packaging of medical devices such as syringes. In particular, the present invention relates to a transparent lid material for a polyester-based resin container in which a lid material sealed by heat sealing is transparent so that a stored item can be accurately visually observed and is easy to open, leaving a trace of opening at the opening.

  Conventionally, as a lid material for a polyester-based resin container, various lid materials excellent in hygiene, heat sealability, easy peel property (ease of opening) and the like have been proposed mainly for food packaging. (For example, see Patent Documents 1 to 3).

  The lid material of the polyester-based resin container can be used, for example, for sealed packaging of medical instruments such as a syringe. And especially in the packaging of medical instruments, from the viewpoint of preventing unauthorized opening and ensuring safety, it is required that an opening trace remains in the opening when opened.

  A lid material for a polyester-based resin container in which an opening trace remains in the opening portion is known. As shown in FIG. 10, this lid material is formed by laminating a polyester layer 101 with a film layer 103 made of a polyethylene resin through an adhesive layer 102, and applying a predetermined surface treatment to the surface of the film layer 103 to form a heat seal layer. A multi-layered structure in which 104 is laminated.

  The lid member 100 is hermetically bonded to a flange of a polyester resin container by heat sealing. When the lid member 100 is opened, the lid member 100 is peeled off from the flange of the container. Then, peeling (interlaminar peeling) occurs between the film layer 103 and the heat seal layer 104 of the lid 100, and the heat seal layer 104 remains uniformly on the opening portion of the flange surface of the container as a trace at the time of opening. It is desirable to do so.

  However, in the lid 100 of the polyester resin container, it is necessary to consider the adhesiveness to both the film layer 103 made of the polyethylene resin and the polyester resin container as the resin material of the heat seal layer 104.

  For this reason, the selection range of the resin material of the heat seal layer 104 is narrow, specifically, it is limited to an ethylene-vinyl acetate copolymer (EVA) resin base. For this reason, it is difficult to adjust the heat seal strength (HS strength), and when the heat seal strength is high, it is difficult to open the lid member 100. If the heat seal strength is weak, there is a problem that the heat seal layer 104 tends to cause cohesive failure at the time of opening, and it is difficult to leave a uniform trace on the opening portion of the container flange surface.

  And the cover material (for example, refer patent document 4) of the polyester-type resin container is known as a cover material which solves the problem mentioned above.

  As shown in FIG. 11, the lid 200 is made of a film layer 113 made of polyethylene resin, a base layer 114 made of urethane resin lacquer, and a polyester resin lacquer through an adhesive layer 112 on a base material 111. The heat seal layers 115 are sequentially laminated. The foundation layer 114 contains an inorganic powder.

Since the inorganic powder is contained in the underlayer 114, the delamination between the underlayer and the heat seal layer 115 is facilitated, the lid can be easily opened, and the amount of the inorganic powder added It is described that the heat seal strength can be arbitrarily adjusted.

Prior art documents are shown below.
Japanese Patent Publication No. 3-50704 Japanese Patent Publication No. 3-362547 JP-A-3-29770 Japanese Patent No. 293669

  However, since the cover material of the polyester resin container of Patent Document 4 contains inorganic powder in the base layer 114, the lid material is remarkably poor, and the stored contents may not be accurately observed. And there is a problem of causing medical errors.

  In addition, since the base layer 114 contains an inorganic powder, it is difficult to slip, and workability such as lamination with the heat seal layer 115 is extremely poor. And there exists a problem that productivity falls and causes a cost rise.

  In addition, since the inorganic powder easily absorbs moisture, there is a problem that the adhesive strength with the heat seal layer 115 is remarkably lowered by humidity. And there is a problem of causing delamination during distribution.

  The present invention has been made in view of the above-described conventional problems, and the problem is that the polyester resin is excellent in transparency, can be easily opened, and can leave a uniform trace in the opening. It is to provide a transparent lid for a container.

In order to solve the above problems, the invention according to claim 1 of the present invention provides:
A transparent lid material for a polyester resin container that is adhered by a heat seal and seals an opening of the polyester resin container,
The transparent lid material is formed by sequentially laminating a film layer made of polyethylene resin, a base layer made of urethane resin lacquer, and a heat seal layer made of polyester fat and urethane resin lacquer on the base material. Formed,
The heat sealing layer is a transparent lid member for a polyester resin container, wherein the heat sealing layer is agglomerated and peeled.

Next, the invention according to claim 2 of the present invention is as follows:
2. The transparent lid material for a polyester-based resin container according to claim 1, wherein the surface of the heat seal layer on the base layer side is surface-treated by a corona discharge treatment so as to have a wetting index of 34 mN / m or more. .

  Since the transparent lid material of the polyester resin container of the present invention has the above-described configuration, it is excellent in transparency. And stored items, such as a medical instrument accommodated in this container, can be visually observed correctly.

  For this reason, the stored items such as medical instruments to be used can be accurately opened without mistakenly opening the stored items such as medical instruments stored in the container. In addition to eliminating waste due to mistakes in opening, there is no problem of medical errors due to mistakes in opening.

  Since the heat seal layer is made of lacquer of polyester resin and urethane resin, it is heat sealed with high adhesive strength to the container. Further, at the time of opening, the heat seal layer of lacquer made of polyester resin and urethane resin is agglomerated and peeled off. And the uniform trace of a heat seal layer can be left in an opening part.

  In addition, since the surface of the film layer on the base layer side is subjected to a surface treatment with a wetting index of 34 mN / m or more by corona discharge treatment, the adhesive strength of the base layer to the film layer is further improved.

  The transparent lid material of the polyester-based resin container of the present invention will be described in detail along the embodiments with reference to the drawings.

  FIG. 1 is a schematic view showing an outline of one embodiment of the constitution of the transparent lid member of the polyester resin container of the present invention. FIG. 2 is a schematic view showing an outline of an embodiment for comparing the transparent lid material of the polyester resin container of the present invention, heat seal strength, haze and the like.

  As shown in FIG. 1, the transparent lid material 10 of the polyester resin container of the present invention is formed by laminating a base material layer 1 and a film layer 3 made of a polyethylene resin via an adhesive layer 2. Further, it is a laminated material having a structure in which a base layer 4 made of a lacquer of urethane resin, a heat seal layer 5 made of a polyester resin and a lacquer of urethane resin are sequentially laminated.

  As the base material of the base material layer, a nylon resin film or sheet, a polyester resin film or sheet, a polyolefin resin film or sheet, or the like can be used. And the base material which is excellent in transparency is preferable.

  Specific examples of the resin material as the nylon resin film or sheet include polycaproamide (nylon 6), poly-ω-aminoheptanoic acid (nylon 7), poly-9-aminononanoic acid (nylon 9), Polyundecanamide (nylon 11), polylaurin lactam (nylon 12), polyethylene diamine adipamide (nylon 2, 6), polytetramethylene adipamide (nylon 4, 6), polyhexamethylene didipamide (nylon 6) 6), polyhexamethylene sebamide (nylon 6,10), polyhexamethylene dodecamide (nylon 6,12), polyoctamethylene adipamide (nylon 8,6), polydecamethylene adipamide (nylon) 10,6), polydecamethylene sebacamide (nylon 10,10), poly Dodecamethylene dodecamide (nylon 12,12), meta-xylene diamine -6 nylon (MXD6) and the like.

  Examples of nylon copolymer resins include caprolactam / laurin lactam copolymer, caprolactam / hexamethylene diammonium adipate copolymer, laurin lactam / hexamethylene diammonium adipate copolymer, hexamethylene diammonium adipate / hexa. Examples include methylene diammonium sebacate copolymer, ethylene diammonium adipate / hexamethylene diammonium adipate copolymer, caprolactam / hexamethylene diammonium adipate / hexamethylene diammonium sebacate copolymer, and the like.

The nylon resin film or sheet forming the base layer of the transparent lid 10 of the polyester resin container of the present invention is preferably a stretched nylon film or sheet. And
A stretched nylon film or sheet alone or a laminated film or sheet of stretched nylon films or sheets or a polyester film or sheet alone and a laminated nylon film or sheet obtained by laminating a stretched nylon film or sheet alone can be used.

  In addition, when flexibility is required by a packaging machine in which a lid is used, a sealing machine or the like, in order to impart flexibility to the nylon resin film or sheet, aromatic sulfonamides, p- It is also possible to blend a plasticizer such as hydroxybenzoic acid or esters, or blend an elastomer component or lactam having a low elastic modulus.

  Examples of the elastomer component include ionomer resins, modified polyolefin resins, thermoplastic polyurethanes, polyether block amides, polyester block amides, polyether ester amide elastomers, modified acrylic rubbers, and modified ethylene propylene rubbers.

  Examples of the resin material for the polyester resin film or sheet include polyethylene terephthalate (PET) resin as a homopolyester resin, polyesters having a polyethylene terephthalate structure based on the following copolymer polyester resins, for example, terephthalic acid and ethylene glycol. Diethylene glycol, polyethylene glycol, propylene glycol, polypropylene glycol, polybutylene as glycols with dibasic acids such as isophthalic acid, phthalic acid, glutaric acid, adipic acid, sebacic acid, dodecanedicarboxylic acid, cyclohexanedicarboxylic acid, etc. Copolymers of ethylene oxide adducts of glycols and bisphenol derivatives, such as polyethylene naphthalate (PEN) resin and polybutylene terephthalate , And the like rate (PBT) resin.

  For the above film or sheet base material, for example, ultraviolet absorbers, antistatic agents, flame retardants, fireproofing agents, fungicides, pigments, fillers, etc. can be used as general additives. . The addition amount can be arbitrarily added from a very small amount to several tens of percent depending on the purpose.

  In addition, the nylon-based resin film or sheet or the polyester-based resin film or sheet forming the base layer of the transparent lid material 10 of the polyester-based resin container according to the present invention includes characters such as photographs, content descriptions, and usage periods of stored items, A printing layer or a label sticker of a desired printed pattern made up of figures, patterns, symbols, etc. is formed.

  As the printing layer, for example, an ordinary gravure ink composition, offset ink composition, letterpress ink composition, screen ink composition, and other ink compositions are used. For example, gravure printing method, offset printing A printing method such as a printing method, a relief printing method, a silk screen printing method, or the like is used.

In the above, various ink compositions include, for example, as a vehicle constituting the ink composition, for example, polyolefin resins such as polyethylene resins and chlorinated polypropylene resins, poly (meth) acrylic resins, polyvinyl chloride Resin, polyvinyl acetate resin, vinyl chloride-vinyl acetate copolymer, polystyrene resin, styrene-butadiene copolymer, vinylidene fluoride resin, polyvinyl alcohol resin, polyvinyl acetal resin, Polyvinyl butyral resin, polybutadiene resin, polyester resin, polyamide resin, alkyd resin, epoxy resin, unsaturated polyester resin, thermosetting poly (meth) acrylic resin, melamine resin, urea Resin, polyurethane resin, phenol resin, xylene resin, Ynoic acid resin, nitrocellulose - scan, ethylcellulose - scan, acetyl butyl cellulose - scan, ethyloxyethyl cellulose - scan the like cellulose resins, chlorinated rubber,
One or a mixture of two or more kinds of resins such as rubber resins such as cyclized rubber, natural resins such as petroleum resins, rosin and casein, oils such as linseed oil and soybean oil, and the like can be used. .

  Then, one or two or more of the above-mentioned vehicles are used as a main component, and one or more of coloring agents such as dyes and pigments are added to this, and if necessary, for example, a filler, Add stabilizers, plasticizers, antioxidants, UV stabilizers and other light stabilizers, dispersants, thickeners, desiccants, lubricants, antistatic agents, crosslinking agents, etc. Ink compositions having various forms obtained by sufficiently kneading with a diluent or the like can be used.

  Further, the nylon resin film or sheet or the polyester resin film or sheet forming the base layer of the transparent lid 10 of the polyester resin container of the present invention is stored in a hermetically sealed package, or the storage period of the stored item, distribution conditions Thus, a transparent vapor-deposited thin film layer made of an inorganic oxide is formed.

  Then, a transparent primer layer for improving adhesion between the nylon resin film or sheet or the polyester resin film or sheet and the transparent vapor-deposited thin film layer made of an inorganic oxide is formed.

  As a method for forming the transparent primer layer, for example, a known printing method such as an offset printing method, a gravure printing method, a silk screen printing method, or a known coating method such as roll coating, knife edge coating, or gravure coating is used. Can do.

  Moreover, about drying conditions, generally used conditions may be used. Further, in order to promote the reaction, it may be left in a high temperature aging chamber for several days.

  The transparent transparent vapor-deposited thin film layer made of an inorganic oxide is a layer made of silicon oxide, aluminum oxide, tin oxide, magnesium oxide, or a mixture thereof, and has transparency and gas barrier properties such as oxygen and water vapor. I just need it.

  And it is not limited to the inorganic oxide mentioned above, If it is a material suitable for the said conditions, it is possible to use it. There are various methods for forming the vapor-deposited thin film layer made of the inorganic oxide on the transparent primer layer 3 of the nylon-based resin film or sheet or the polyester-based resin film or sheet, but it can be formed by a normal vacuum vapor deposition method. it can.

  In addition, other thin film forming methods such as sputtering, ion plating, and plasma vapor deposition (CVD) can be used. From the viewpoint of productivity, the vacuum vapor deposition method is the best at present.

  As the heating means of the vacuum vapor deposition method, it is preferable to use any one of an electron beam heating method, a resistance heating method, and an induction heating method, but the electron beam heating method is used in consideration of the wide range of selectivity of the evaporation material. It is more preferable. And in order to raise the transparency of a vapor deposition film, you may use the reactive vapor deposition which blows in various gases, such as oxygen, at the time of vapor deposition.

  The thickness of the transparent vapor-deposited thin film layer varies depending on the type and configuration of the inorganic compound to be used, but is generally preferably in the range of 1 to 500 nm, and the value is appropriately selected. However, if the film thickness is less than 1 nm, a uniform film cannot be formed, and the function as a gas barrier layer cannot be sufficiently achieved.

Next, the adhesive layer 2 is for laminating and bonding the film layer 3 to the base material layer 1, and the base material layer 1 and the film layer 3 are dry laminating or extrusion laminating via the adhesive layer 2. It is laminated by ting.

As the adhesive layer 2 when the lamination is performed by dry laminating, a polyester adhesive, a urethane adhesive, and other known dry laminating adhesives can be used, and the coating amount is 0.5 to 5 g. / M ² is preferable.

  In addition, as the adhesive layer 2 when the lamination is performed by extrusion lamination, polyethylene (PE), polypropylene (PP), or the like can be applied, and the thickness is preferably, for example, 10 to 30 μm.

  The film layer 3 serves as a medium when the base layer 4 is laminated on the base material layer 1, and the film layer 4 may be an adhesive thermoplastic resin that can be heat-sealed. , Low density polyethylene, medium density polyethylene, high density polyethylene, linear (linear) low density polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-ethyl acrylate copolymer, ethylene-acrylic Polyolefin resin such as acid copolymer, ethylene-methacrylic acid copolymer, ethylene-propylene copolymer, methylpentene polymer, polyethylene or polypropylene is used for acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumar Acid-modified polyolefin resin modified with unsaturated carboxylic acid such as acid, itaconic acid, etc. It may be a resin other like.

  In particular, when the container 8 and the lid 10 are used for sealed packaging of medical devices, sterilization with gamma rays is performed after sealing, so that the film layer 3 has no problem of off-flavor due to gamma rays. Linear low density polyethylene (LLDPE) with few polar groups is preferred.

  Moreover, it is preferable on the opening function that the total thickness of the base material layer 1, the adhesive layer 2, and the film layer 3 shall be 90-150 micrometers.

  The surface of the film layer 3 is desirably surface-treated with a wetting index of 34 mN / m or more by corona discharge treatment in order to increase the adhesive strength of the underlayer 4. Here, the reason why the wetting index is set to 34 mN / m or more is that when the wetting index is less than 34 mN / m, the surface of the film layer 3 is not so dense and the improvement of the adhesive strength cannot be expected.

  Without being limited to the corona treatment, any one of low temperature plasma treatment, plasma treatment using reactive ion etching (RIE), ion bombardment treatment, chemical treatment, solvent treatment and the like may be performed.

  Next, the base layer 4 of the transparent lid 10 of the polyester resin container of the present invention is coated with a colorless urethane lacquer agent. Examples of the coating method of the lacquer agent include a direct gravure roll coat method, a gravure roll coat method, a kiss coat method, a reverse roll coat method, a fountain method, and a transfer roll. It can be applied by a method such as a coat method or the like.

  And as a coating film (dry state), it exists in the range of 15-50 micrometers, Preferably about 30-40 micrometers is desirable.

  Next, the heat seal layer 5 of the transparent lid material 10 of the polyester resin container of the present invention is applied using a lacquer agent in which a polyester resin and a urethane resin are mixed. Examples of the coating method of the lacquer agent include a direct gravure roll coat method, a gravure roll coat method, a kiss coat method, a reverse roll coat method, a fountain method, and a transfer roll. It can be applied by a method such as a coat method or the like.

  And as a coating film (dry state), it exists in the range of 15-50 micrometers, Preferably about 30-40 micrometers is desirable.

  Next, FIG. 3 is an explanation for explaining a state in which the transparent lid member 10 of the polyester resin container of the present invention is peeled and rubbed after being heat sealed to the flange portion of the polyester resin container in which the stored items are stored. FIG.

  As shown in FIG. 3, the transparent lid material 10 of the polyester resin container of the present invention is heat sealed and bonded by the flange portion 13 of the container after the container 14 is stored from the opening of the container 12 made of polyester resin. The When the stored item 14 is used, the transparent lid member 10 that is heat-sealed with the flange portion 13 is peeled off from the flange portion 13.

  When the transparent lid member 10 is peeled off from the flange portion 13, it is agglomerated and peeled off from an appropriate portion of the heat seal layer 5 formed on the transparent lid member 10. And the uniform trace of the heat-seal layer 5 cohered and peeled to the flange part of a container can be left.

  Next, FIGS. 4 to 9 are explanatory views for explaining a method for producing a container that is heat-sealed to the heat seal layer of the transparent lid 10 of the polyester resin container of the present invention.

  The container 12 can be formed by a vacuum forming method as shown in FIGS. 4 to 6 or a pressure forming method, a blister process or the like (not shown) by a film or sheet made of a polyester resin.

  7 to 9, it is also possible to use a container in which a polyester-based resin film or sheet is closely bonded to the inner surface of a container injection-molded using a thermoplastic resin.

  Furthermore, although not shown in the drawing, a so-called in-line home seal machine or the like that forms a container, fills a stored item, and heats the transparent lid 10 to the flange portion of the container may be used.

  As the polyester resin that is a material of the container 12, polyethylene terephthalate (PET), amorphous polyethylene terephthalate (APET), and crystalline polyethylene terephthalate (CPET) can be applied.

  When the container is formed by the vacuum forming method 40 as shown in FIGS. 4 to 6, the polyester resin film or sheet 16 is heated at a predetermined temperature by the heating unit 15 as shown in FIG. 4.

  As shown in FIG. 5, the heating unit 15 and the heated polyester resin film or sheet 16 are in close contact with the upper surface of the molding die 17 and at the same time, a plurality of vacuum holes formed in the bottom of the molding die 17. 18 is attached by suction. Then, as shown in FIG. 6, when the heating unit 15 rises, the molded container rises to the upper part of the mold 17 and further moves horizontally to be punched into a predetermined shape having a flange part.

Further, in the injection molding 50, the container 12 is molded by the male mold 19 and the female mold 21 as shown in FIGS. A gate 23 and a gate hole 22 are formed in the bottom mold 24 that forms the bottom of the female mold 19. Further, when the container 12 is molded, the male mold 19 is lowered and the molten resin is injected from the gate hole 22 into the cavitation as shown in FIG. Then, the container 12 having the flange portion 13 as shown in FIG.

  Hereinafter, the transparent lid material of the polyester resin container of the present invention will be described in more detail with specific examples, but is not limited thereto.

<Example 1>
As shown in FIG. 1, the laminate material used for the transparent lid of the polyester resin container of the present invention uses a polyethylene terephthalate (PET) film having a thickness of 12 μm for the outermost substrate layer (1), The adhesive layer (2) uses 20 μm thick polyethylene (PE), the film layer (3) uses 40 μm thick cotton-like low density polyethylene (LLDPE), and the underlayer (4) For the heat seal layer (5), a NEWLP Super R medium (manufactured by Toyo Ink Manufacturing Co., Ltd.) is used, and the heat seal layer (5) is a polyester resin and a urethane resin having a thickness of 5: 5 (solid content). Ratio) It was prepared by extrusion laminating and gravure coating using a mixture.

  In the above production, it was confirmed by a wetting test method (JISK6768) that the surface of the cotton-like low density polyethylene (LLDPE) used for the film layer (3) was subjected to corona treatment and the wetting index was 34 mN / m or more.

  Below, the comparison of this invention is demonstrated.

<Comparative Example 1>
As shown in FIG. 2, the laminated material used for the comparison of the transparent lid material of the polyester resin container of the present invention uses a polyethylene terephthalate (PET) film having a thickness of 12 μm for the outermost base material layer (6). For the adhesive layer (7), polyethylene (PE) having a thickness of 20 μm is used, and for the film layer (8), cotton-like low density polyethylene (LLDPE) having a thickness of 40 μm is used. 9) Q105T white (made by Toyo Ink Manufacturing Co., Ltd.) is used for a thickness of 35 μm, and Q106THS varnish (made by Toyo Ink Manufacturing Co., Ltd.) is used for a thickness of 35 μm for the heat seal layer (11). It was made by extrusion laminating and gravure coating.

<Evaluation 1>
The lid material obtained in Example 1 and Comparative Example 1 was applied to the flange portion of an amorphous polyethylene terephthalate (APET) container at a temperature of 120 to 200 ° C. (20 ° C. interval), a pressure of 2 × Ncm ² ,
A heat seal was performed with a pressure time of 1 second and a heat seal strength test was conducted.

  The heat seal strength test was performed by 90-degree peeling (T-type peeling) to be peeled in the direction of 90 degrees, under the conditions of a width of 15 mm and a pulling speed of 300 mm / min (conforming to JISZ707). The results are shown in Table 1.

表１は、実施例１および比較例１で得られた蓋材のヒートシール強度試験の測定結果を記す。

Table 1 shows the measurement results of the heat seal strength test of the lid materials obtained in Example 1 and Comparative Example 1.

<Evaluation 2>
As a method for evaluating the transparency of the lid materials obtained in Example 1 and Comparative Example 1, haze measurement (cloudiness / turbidity) was performed (based on JISZ7105). And as a measuring machine, SZ-Σ80
(Nippon Denshoku Industries Co., Ltd.) was used. The results are shown in Table 2.

表２は、実施例１および比較例１で得られた蓋材のヘイズ測定（曇り度／濁り度）測定結果を記す。

Table 2 shows the measurement results of haze measurement (cloudiness / turbidity) of the lid materials obtained in Example 1 and Comparative Example 1.

<Evaluation results>
In Example 1, the heat seal strength is almost the same as that of Comparative Example 1, but the transparency is superior to that of Comparative Example 1. And the peeling trace can also be sufficiently confirmed visually.

  The transparent lid material of the polyester resin container of the present invention is an excellent invention that can be used not only for excellent packaging of medical devices, but also for preventing counterfeiting of precision instruments.

It is sectional drawing which shows the cross section of one Example of the transparent lid | cover material of the polyester-type resin container of this invention. It is sectional drawing which shows the cross section of the cover material for comparing with the transparent cover material of the polyester-type resin container of this invention. It is explanatory drawing for demonstrating the state which the transparent cover material of the polyester-type resin container of this invention peels from the flange part of a container. It is explanatory drawing for demonstrating preparation of a container. It is explanatory drawing for demonstrating preparation of a container. It is explanatory drawing for demonstrating preparation of a container. It is explanatory drawing for demonstrating preparation of a container. It is explanatory drawing for demonstrating preparation of a container. It is explanatory drawing for demonstrating preparation of a container. It is sectional drawing which shows the cross section of the conventional lid | cover material. It is sectional drawing which shows the cross section of the conventional lid | cover material.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Base material layer 2 ... Adhesive layer 3 ... Film layer 4 ... Base layer 5 ... Heat seal layer 6 ... Base material layer 7 ... Adhesive layer 8 ... Film layer 9 ... Base layer 10 ... Transparent lid material 11 ... Heat seal Layer 12 ... Container 13 ... Flange 14 ... Contained matter

Claims (2)

A transparent lid material for a polyester resin container that is adhered by a heat seal and seals an opening of the polyester resin container,
The transparent lid material is formed by sequentially laminating a film layer made of polyethylene resin, a base layer made of urethane resin lacquer, and a heat seal layer made of polyester fat and urethane resin lacquer on the base material. Formed,
A transparent lid material for a polyester-based resin container, wherein the heat seal layer is agglomerated and peeled.   2. The transparent lid material for a polyester resin container according to claim 1, wherein the surface of the heat seal layer on the base layer side is surface-treated by a corona discharge treatment so as to have a wetting index of 34 mN / m or more.

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