JP2008213039A - Cap with liner and its manufacturing method, and bottle with cap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a cap with a liner, and a cap with a liner and a bottle with a cap having excellent plug-openability, sealability, sanitary property, recyclability and molding workability or the like. <P>SOLUTION: In the manufacturing method, the cap 1 with the liner capable of closing a mouth piece part of a bottle is manufactured by installing the liner 5 in a cap shell 4 comprising a top plate part 2 and a cylindrical circumferential wall part 3 hanging from a circumferential edge of the top plate part 2. The manufacturing method comprises a hard sheet installing step of inserting a disk-shaped hard sheet 5a in the cap shell 4 while being brought into contact with an inner surface of the top plate part 2, and a flexible layer forming step of forming a flexible layer 5b more flexible than the hard sheet 5a by the resin molding on the hard sheet 5a in an inserted state. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a cap with a liner that is excellent in opening performance, sealing performance, hygiene, recyclability, molding processability, and the like, a manufacturing method thereof, and a bottle with a cap.

  Generally, caps (container lids) such as glass bottles, PET bottles, and aluminum bottles that are provided with a synthetic resin liner are widely used. In the case of a metallic cap, a cap shell (cap shell) is formed by repeatedly painting several times on both sides of an aluminum thin plate, tin thin plate, chrome plated thin plate (TFS), etc. A method of inserting a molded product (disc molded body) (disk insertion method), a method of thermally bonding a disk molded body at the center after insertion (disk insertion bonding method), and pouring a liner material into a cap shell like vinyl chloride sol There are a method of bonding at the same time as gelation by heating (lining method), a method of thermally bonding and embossing a molten resin in a cap shell (in-shell molding method) and the like.

  These methods have merits and demerits, and the disk insertion method and the disk insertion bonding method are relatively inexpensive in manufacturing equipment. However, since the liner is a single layer, oxygen barrier properties are often inferior. Further, since the liner is punched out from the sheet into a disc shape, liner debris is generated, and there is a disadvantage that the yield of the material is poor. These liners are recyclable, but once used for food use are mixed, and when used, a part of the regenerated product touches the surface in contact with the liquid. For this reason, in view of hygiene, punched scraps are usually not reused for the same thing. Moreover, since it is a sheet | seat, the center part which is not related to a seal cannot be decreased, but a liner weight becomes large.

  On the other hand, in the lining method, the liner material can be disposed only in the seal portion, but since the material is mainly vinyl chloride, there is a concern in terms of hygiene. The in-shell mold method is relatively efficient with respect to the amount of liner material used, but is suitable for mass production but is not suitable for small-volume production. Further, since the liner material is extruded from an extruder and cut in a semi-molten state, a material having poor extrusion moldability cannot be used, and usable materials are limited. Furthermore, since the opening torque value generally increases, there is a tendency to frequently use a lubricant.

  On the other hand, a liner material having a multilayer structure has been proposed. This liner material is made by laminating a high hardness resin and a low hardness resin to obtain good punchability and cap insertion with a high hardness resin, as well as shape retention after sealing and low opening torque when opening. This is a system in which sealing properties are expressed with a resin having low hardness. That is, this liner material can provide good sealing properties and openability. Conventionally, as a liner material having such a multilayer structure, for example, Patent Document 1 proposes a laminate of PP (polypropylene) resin and an elastomer at a certain ratio. However, in this method, the disc is punched out of the sheet into a liner, so that scraps are generated, which increases the cost of the liner itself. Moreover, although it molds by coextrusion in order to bond a hard member and a soft member, since the reusable use of a punching waste cannot be performed, the effective usage rate of material is low.

  Patent Document 2 proposes a packing in which an aluminum sheet is punched out and subjected to a drawing process, and a synthetic resin liner is attached thereto. However, in this method, after the liner adhesive paint is applied to the aluminum plate, punching and drawing are performed and the liner material is heat-bonded (heat-bonding of the liner and shell), which increases the cost. Absent. Further, it is not easy to recycle the punched scraps of the aluminum sheet as compared with the resin (PP resin or the like).

JP 2006-76575 A JP 2003-321040 A

The following problems remain in the conventional technology.
Of the above-described cap liner manufacturing methods, a molding method is generally used in which a liner material is melted by an extruder and then embossed into a shell, and at this time, an adhesive paint and a liner material applied to the inner surface of the shell Will adhere to the entire surface. At this time, if the liner material is not adhered to the inner surface of the shell, the liner resin adheres to the pressed mold, and the liner material does not remain in the shell, and the liner cannot be formed on the cap. For this reason, in the case of metal caps, paint that adheres to the liner material is applied, but when capping a container with a cap with the liner material adhered to the entire surface, the liner does not move easily, so it follows the shape of the container. It may be difficult and the seal may not be sufficient. Therefore, it is desirable that the liner material in the portion in contact with the container mouth is flexible, that is, non-adhesive.

  However, even in this case, the liner material slides between the container and the liner because the liner material is firmly bonded to the cap when opening. In this case, since the adhesion between the container and the liner is strong, a large force is required for opening (sliding between the liner and the container opening) (the opening torque is high). For this reason, a lubricant is usually added to the liner material, and the opening torque is lowered by interposing the lubricant on the surface of the liner material. However, if the amount of lubricant added is small, the lubricity effect of the lubricant is not recognized, and many If too much, the lubricant floating on the liner surface falls onto the contents and becomes a foreign matter. For this reason, it is required to use an appropriate amount of lubricant, but since it is affected by various conditions, it is difficult to determine an appropriate amount. Therefore, in this case, the problem that the opening torque is often too high or the lubricant floats on the contents, or both problems occur simultaneously.

  As a solution to this problem, liner sheets of multilayer sheets as shown in Patent Documents 1 and 2 have been proposed. This is a multilayer sheet liner in which a hard and slippery sliding layer (hard layer) is arranged on the liner contacting the cap shell, and a flexible sealing layer (soft layer) is arranged on the container contacting the mouth of the container. It is a material. Since the liner material is displaced between the sliding layer and the cap shell at the time of opening, it can be opened with a small force. Further, it is not necessary to use a lubricant in the portion in contact with the container mouth, or even if it is used, the problem of floating the lubricant does not occur due to the small amount.

  However, as described above, since this multilayer liner material is formed into a sheet and then punched into a disk shape and inserted into a cap shell for use, a large amount of scrap is generated, but this scrap is multilayer. It is difficult to reuse (recycle). In addition, since this multilayer sheet is made by rolling with two rollers, it is almost uniform in thickness, so various molding processability cannot be obtained. It is not possible to take measures such as a method of reducing the amount used by reducing the thickness, and making various shapes in the center of the liner to improve the liquid drainage of the liner.

  The present invention has been made in view of the above-described problems, and provides a cap with a liner excellent in unplugging performance, sealing performance, hygiene, recyclability, molding processability, and the like, a manufacturing method thereof, and a bottle with a cap. With the goal.

  The present invention employs the following configuration in order to solve the above problems. That is, in the method for manufacturing a cap with a liner according to the present invention, the liner can be installed in the cap body composed of the top plate portion and the cylindrical peripheral wall portion hanging from the periphery of the top plate portion, and the mouth of the container can be closed. A method for producing a cap with a liner, comprising: a hard sheet installation step in which a disc-shaped hard sheet is inserted into the cap main body in contact with the inner surface of the top plate portion; and the hard sheet is placed on the hard sheet in the inserted state. And a soft layer forming step of forming a soft layer softer than the sheet by resin molding.

  The cap with a liner of the present invention comprises a cap body composed of a top plate portion and a cylindrical peripheral wall portion depending from the periphery of the top plate portion, and a liner provided on the inner surface of the top plate portion, The liner has a multilayer structure including a hard sheet disposed in contact with the inner surface of the top plate portion, and a soft layer formed by resin molding on the hard sheet and softer than the hard sheet. It is characterized by being.

  In these caps with a liner and caps with a liner, a soft layer softer than the hard sheet is formed on the hard sheet by resin molding. It is a layer and can be reused (recycled), and the punched hard sheet has no front and back, and there is no need to select the front and back when inserted into the cap body. In addition, since it has a multilayer structure consisting of a soft layer and a hard sheet, a high sealing property can be obtained by the soft layer, and the liner is free from the cap body by a hard sheet that is more slippery and has a lower frictional resistance than the soft layer. It can be rotated to provide high opening performance and drop impact resistance, and it is not necessary to add a large amount of lubricant. Furthermore, since only the soft layer is formed by resin molding, various shapes of the soft layer can be obtained, and the partial amount can be individually set as necessary to reduce the amount of material used. Further, since the molten soft material is placed on a hard sheet and molded by resin, the surface of the hard sheet is completely aseptic and a sanitary excellent cap can be obtained. Even when the hard sheet is preliminarily printed, it is hygienic because the printed surface is covered with the soft layer and does not directly contact the contents.

Further, in the method of manufacturing a cap with a liner according to the present invention, a liner locking projection that protrudes inward is provided on the cylindrical peripheral wall portion at a position spaced from the top plate portion, and in the hard sheet installation step, The hard sheet is inserted between the liner locking projection and the top plate portion, and in the soft layer forming step, the soft layer is coaxial with the hard sheet and has a small outer diameter than the liner locking projection. Is also formed inside.
When a soft layer is embossed on a hard sheet with a mold punch and resin molding is performed, the soft layer adheres to the mold punch, and when the mold punch is released, the entire liner is pulled up and may come off. is there. In addition, a soft layer may adhere to the mouth portion of the container when the container is opened, and the entire liner may come off the cap body or remain in the mouth portion. As a countermeasure against this, in the method of manufacturing a cap with a liner according to the present invention, the soft layer is formed coaxially with the hard sheet and inside the liner locking projection with a small outer diameter. Even if the soft layer adheres and the entire liner is pulled, the outer edge portion of the hard sheet hits and is locked by the liner locking protrusion, and the liner can be prevented from coming off from the cap body.

  Furthermore, in the manufacturing method of the cap with a liner according to the present invention, the distance between the inner side of the outer peripheral edge of the hard sheet and the outer side of the liner locking projection is W (mm), and the outer peripheral edge of the hard sheet and the liner When the distance from the stop projection is h (mm), h and W are set in a range surrounded by h (mm) = 3 W (mm) +1, h = 0, and W = 2. Features. That is, in this method of manufacturing a cap with a liner, since the positional relationship between the hard sheet and the liner locking projection is set in the above range, the contact between the hard sheet and the liner locking projection is prevented, and the opening torque is reduced. While preventing the increase, the liner can be prevented from falling off.

  Moreover, the manufacturing method of the cap with a liner of the present invention is characterized in that t × f is 150 or more when the thickness of the hard sheet is t (mm) and the flexural modulus is f (MPa). To do. That is, in this method of manufacturing a cap with a liner, when the thickness of the hard sheet is t (mm) and the flexural modulus is f (MPa), t × f is 150 or more, so that the mold punch or container When the soft sheet adheres to the mouth portion of the hard sheet and is pulled and the hard sheet comes into contact with the liner locking protrusion, it is possible to prevent the rigid sheet from coming out of the liner locking protrusion due to the high bending elasticity.

  Moreover, the manufacturing method of the cap with a liner of this invention makes the thickness of the part which contact | connects the opening | mouth part of the said container of the said soft layer thicker than another part. That is, in this method for manufacturing a cap with a liner, the thickness of the portion of the soft layer that contacts the mouth of the container can be made thicker than the other portions, so that high sealing properties can be obtained and the mouth can be touched. The portions other than the portion can be made thin, and the cost can be reduced by reducing the amount of the soft material used.

  Moreover, the manufacturing method of the cap with a liner of this invention applies a non-volatile organic liquid between the said top-plate part and the said liner. That is, in this method of manufacturing a cap with a liner, the non-volatile organic liquid is applied between the top plate portion and the liner, so that the adhesion of the liner and the gas barrier property can be improved.

Furthermore, in the method for producing a cap with a liner according to the present invention, when the area of the liner is S (cm ² ) and the application amount of the nonvolatile organic liquid is Y (mg), the application amount of the nonvolatile organic liquid Is set so that Y is in aS and a is in the range of 0.01 to 1.00. That is, in the method of manufacturing a cap with a liner, the application amount of the nonvolatile organic liquid is set so as to fall within the above range, and therefore, an appropriate application amount that does not ooze according to the area of the liner and a good gas barrier. You can get sex.

  Moreover, it is preferable that the said non-volatile organic liquid is a silicone oil or glycerol in the manufacturing method of the cap with a liner of this invention. That is, in this method for producing a cap with a liner, the non-volatile organic liquid is silicone oil or glycerin, so that the gas barrier property is remarkably improved. When glycerin is selected as the non-volatile organic liquid, the kinematic viscosity of the non-volatile organic liquid can be easily adjusted by adding water.

Moreover, the cap with a liner of the present invention is produced by the method for producing a cap with a liner of the present invention.
Moreover, the bottle of this invention is a bottle provided with the cap with a liner, Comprising: The said cap with a liner is a cap with a liner of the said invention, It is characterized by the above-mentioned.
That is, in these caps with a liner and bottles with a cap, since a soft layer is formed on a hard sheet by resin molding, as described above, the opening performance, sealing performance, hygiene, recyclability, and molding processability Etc.

The present invention has the following effects.
That is, according to the manufacturing method of a cap with a liner and a cap with a liner and a bottle with a cap according to the present invention, since a soft layer is formed on a hard sheet by resin molding, the scraps of the hard sheet can be recycled and the soft layer In addition, a high moldability can be obtained, and further, a high sealing property, an opening property, a sanitary property, a flavor resistance property, a non-migration property and a drop impact resistance property can be obtained.

  Hereinafter, an embodiment of a manufacturing method of a cap with a liner, a cap with a liner, and a bottle with a cap according to the present invention will be described with reference to FIGS. 1 to 3.

As shown in FIGS. 1 and 2, the cap 1 of this embodiment is a bottomed cylindrical metal cap that includes a top plate portion 2 and a cylindrical peripheral wall portion 3 that hangs down from the periphery of the top plate portion 2. A shell (cap body) 4 and a plate-shaped synthetic resin liner 5 provided on the inner surface of the top plate portion 2 without being dropped off are provided.
Moreover, the bottle (container) 6 with a cap of this embodiment is equipped with the said cap 1 in the state fastened around the mouthpiece (mouth) 7.

  The cap shell 4 is processed from, for example, aluminum or an aluminum alloy plate, and the plate is coated by coating the inner and outer surfaces (inner surface: size varnish + top coat, outer surface: size coat + top coat (shine varnish)). A board is used. For the inner and outer surface top coats, various lubricant added types are used as necessary. For example, a coating material obtained by adding a polyolefin wax or the like as a lubricant to a resin such as epoxy phenol is baked and applied to the inner surface of the top plate 2.

The liner 5 has a multilayer structure including a hard sheet 5a disposed in contact with the inner surface of the top plate 2 and a soft layer 5b formed by resin molding on the hard sheet 5a and more flexible than the hard sheet 5a. The cap shell 4 has a sealing effect.
The hard sheet 5a is set so that t × f is 150 or more when the thickness is t (mm) and the flexural modulus is f (MPa). The thickness of the hard sheet 5a is set to 0.1 mm to 1.0 mm, more preferably 0.2 mm to 0.8 mm.

Further, the soft layer 5b is set such that the thickness of the portion in contact with the cap portion 7 of the bottle 6 is thicker than other portions. Moreover, the thickness of the part which touches the nozzle | cap | die part 7 of the soft layer 5b is set to 0.1 mm-0.9 mm.
The soft layer 5b is formed in a circular shape that is coaxial with the hard sheet 5a and has a small outer diameter.

  The cylindrical peripheral wall portion 3 includes a knurl 8, a liner locking projection 9, a perforation 10, a bead 11, and a skirt portion 12. The liner locking projection 9 has a triangular or semicircular cross-section recessed inside the cylindrical peripheral wall portion 3, and a plurality of the liner locking projections 9 are arranged at intervals in the circumferential direction so as to protrude inward. As described above, it has a function of supporting the liner 5 from its lower surface side and a function of a substantial cleaning port. The liner locking protrusion 9 may be formed by generating a protrusion inward in a circumferential belt shape.

A plurality of liner locking projections 9 are formed at approximately equal intervals, and the positions thereof are set between the top surface and the thickness of the hard sheet 5a, or further up to 1.0 mm. Further, in FIG. 4, the depth dimension (pushing amount) D ₀ of the liner locking projection 9 depends on the diameter of the cap and the thickness of the hard sheet 5a, but D ₀ ≦ cap radius (R ₁ ) −bottle mouth portion. Radius (R ₂ ) −Aluminum plate thickness (t ₀ ). Actually, it is preferable to be 0.2 mm or less for the convenience of the mold when the flexible material is molded. However, if D ₀ is too small liner 5 is also locking is insufficient, cause of the falling off of the liner 5. Usually, it is 0.5 to 2.0 mm.

The dimension of the distance W between the inner side of the outer peripheral edge of the hard sheet 5a and the outer side of the liner locking projection 9 is also important. That is, W ≦ D ₀ −aluminum plate thickness (t ₀ ) −thickness (t) of the hard sheet 5a. Preferably it is in the range of -0.2 mm to 2.0 mm, more preferably in the range of 0 to 2.0 mm.

  Furthermore, if the distance (h) between the outer peripheral edge of the hard sheet 5a and the liner locking projection 9 is too small, the liner 5 comes into contact with the liner locking projection 9 and causes the opening torque to be high, which is too large. This causes the liner 5 to fall off. Preferably it exists in the range of 0.0 mm-2.0 mm. This h correlates with W with respect to liner dropping, and the range in which the liner 5 does not drop or shift is h (mm) = 3 W (mm) +1 and h where h is the vertical axis and W is the horizontal axis. It is preferable to fall within the range of = 0 and W = 2. More preferably, h (mm) = 3 W (mm) +0.4, h = 0, and W = 2.

The cap 1 is placed on a bottle body 13 such as a glass bottle, a resin bottle such as a PET bottle, or a so-called bottle can molded with a metal such as an aluminum alloy. A bottle with a cap (hereinafter also simply referred to as a bottle) 6 is attached.
The capping process is performed using a capping device including a pressure block, a screw roller, a skirt roller, and the like.

  That is, the top plate portion 2 of the cap 1 placed on the cap portion 7 is pressed toward the bottom of the bottle with the pressure block, and in this state, the stepped portion 14 is formed on the shoulder portion of the cap 1 by drawing with the pressure block. . Further, in this state, the screw portion 7a is formed by the screw roller, and the skirt portion 12 is wound around the turn portion 7b of the base portion 7 by the skirt roller, whereby the capping process is performed.

Thus, when the cap 1 is wound around the base portion 7, the cap 1 is brought into a state where the liner 5 on the inner surface side of the top plate portion 2 is pressed against the base portion 7. As a result, the contents of the bottle 6 are sealed. The filling of the contents is naturally performed immediately before the cap 1 is put on the bottle 6.
On the other hand, when opening the cap, the cap 1 is turned and cut from the perforation 10, and the cap 1 is removed from the base portion 7, whereby the base portion 7 is opened and the contents are taken out.
Then, by reattaching the removed cap 1 to the base part 7, it is possible to reclose the cap.

  The cap 1 may be made of a synthetic resin. In this case, a liner is inserted into a cap shell formed by injection molding, compression molding, or the like, mainly using synthetic resin such as polypropylene or polyethylene. It is supposed to be. Many synthetic resin cap shells are molded with threaded parts, knurls, and PP band parts during molding. Some perforations may be inserted by post-processing.

  In the case of a cap made of synthetic resin, a method is generally employed in which the stopper is put on the base 7 and is tightened while rotating. At this time, the PP band part is locked to the turnip part 7 b of the base part 7. The plug is opened along the screw of the cap portion 7 by rotating in the reverse direction of the plugging. At this time, since the PP band portion is locked to the turnip portion 7b of the base portion 7, it is clearly shown that the PP band portion is cut from the perforation and opened. In this case, it can be reclosed as necessary.

  Next, the manufacturing method of the cap 1 with a liner of this embodiment is demonstrated with reference to FIG. 3 about the case of a metal cap.

  For example, in the case of a 38PP cap, in order to produce the cap shell 4 made of aluminum, first, the inner and outer surfaces are painted on the aluminum plate 21 having a thickness of 0.25 mm as shown in FIG. Usually, a size coat and a top coat are applied to the inner surface, a size coat is applied to the outer surface, printing is performed as necessary, and then a top coat (shiny varnish) is applied. These thicknesses are generally 1-10 μm and each is baked and dried at 150-200 ° C. for 8-12 minutes. Lubricant is applied to this and punched out with a press 22. Further, the cap shell 4 is manufactured by processing the sewing machine portion 10, the groove, the knurl 8 and the like by the knurler 23 in a subsequent process.

Next, a method for producing the liner 5 will be described with reference to FIG.
Conventionally, when a liner material is produced, for example, a sheet is produced by an extruder, punched into a disk shape, put into a mold, and an elastomer is produced by insert molding using an injection molding machine.

Or the method of shape | molding and bonding a hard layer and an elastomer layer alternately with a two-color molding machine is taken. In general, a liner formed by this method is inserted into a cap shell by aligning using a hopper.
In addition, when producing a cap by this method, the production cost of the liner increases. In addition, a special mold and a special manufacturing machine (such as a two-color molding machine) are required, and the production speed is extremely inferior. Furthermore, an apparatus for aligning and aligning the front and back of the molded liner is required.

On the other hand, the manufacturing method of this embodiment is excellent in productivity and cost as follows. In the manufacturing method of the present embodiment, as shown in FIG. 3, first, a PP single-layer sheet 27 that becomes the hard sheet 5 a is extruded from an extruder 25 equipped with a T die 24. This is punched into a disk-like hard sheet 5 a by the sheet liner machine 30 and inserted into the cap shell 4. There is no choice between front and back.
The cap shell 4 is formed with a liner locking projection 9 so that the disk of the hard sheet 5a once inserted is hard to come off. The thickness of the hard sheet 5a at this time is set to 0.1 to 1.0 mm, preferably 0.2 to 0.8 mm. When the thickness is less than 0.1 mm, the function as the hard sheet 5a is not sufficient.

  In the next in-shell molding process, a certain amount of soft resin such as elastomer extruded and melted from the extruder 25 is put into the cap shell 4 in which the hard sheet 5a is inserted, and a fixed liner shape is obtained with a cooled mold immediately. The formed soft layer 5b is formed. The shape of the soft layer 5b is smaller than the outer diameter of the hard sheet 5a and has a concentric circle as described above. In the case of this resin molding, the hard sheet 5a and the elastomer soft layer 5b are completely bonded by selecting materials. If the bonding is weak, the sheet surface is subjected to corona discharge treatment and glow discharge processing after the sheet is formed. Surface treatment steps such as plasma treatment, anchor coating treatment, frame treatment, and adhesive application may be added. In this case, the surface treatment may be performed only on the surface that adheres to the elastomer or the like.

  If the thickness of the hard sheet 5a at this time is less than 0.1 mm, the resin of the soft layer 5b is not separated from the mold punch after being bonded to the soft layer 5b of the in-shell molded soft resin, and the cap together with the hard sheet 5a. The phenomenon of slipping out of the shell 4 occurs. Further, the thickness and hardness of the hard sheet 5a are important, and the value of t × f is preferably 150 or more when the thickness of the hard sheet 5a is t and the flexural modulus f thereof. When the value of t × f is less than 150, when the flexible material is melted and placed on the hard sheet 5a and embossed with a mold punch, the soft member of the soft layer 5b adheres to the punch, and the hard sheet is removed from the cap shell 4 Both 5a may be pulled up. Moreover, it may remain in the base part 7 at the time of opening, or may come off the cap shell 4 and fall off.

If the thickness of the hard sheet 5a is greater than 1.0 mm, it cannot serve as a cap liner. The punched scraps 28 of the hard sheet 5a are usually immediately crushed into chips by a chopper, used as a recycled material, and regenerated as the hard sheet 5a.
In the case where the cap shell is made of resin, the cap shell is substantially the same as the metal cap shell 4, but the cap is fitted with a male screw that is fitted inside the cap shell in advance with the male screw installed in the bottle mouth. is set up. After this is molded by injection molding or compression molding, perforation process, vent hole process, outer surface printing process, etc. are performed as necessary. After inserting the hard sheet 5a in the same manner as the above-mentioned aluminum cap, the molten soft liner The soft layer 5b is formed by supplying the material onto the hard sheet 5a and embossing with a cooling punch, and the cap of the present invention can be provided.

  Since the liner 5 and the cap shell 4 can be freely rotated, when the cap 1 is opened from the bottle body 13, the opening torque at the beginning of the rotation of the cap 1 is such that the hard sheet 5 a of the liner 5 and the cap shell 4 Only the resistance between. In this case, unlike the soft layer 5b in contact with the base portion 7, the hard sheet 5a has a low frictional resistance, so that an appropriate opening torque value with little temperature dependency can be obtained.

  In opening the cap 1 of this embodiment, the cap shell 4 rotates without sliding the liner 5 first after sliding between the liner hard layer 5a and the cap shell 4, and the liner 5 Is lifted by the liner locking projection 9. In this case, since the force for lifting the liner 5 from the base portion 7 is obtained by the rotation of the cap shell 4, a very low rotational torque is sufficient. In this case, it is not necessary to add a large amount of lubricant to the soft layer 5b, and there is no problem that the lubricant bleeds from the liner 5 and falls onto the contents.

  In the case of a conventional multilayer sheet liner composed of a hard member and a flexible member, there is oxygen permeation from the top surface of the liner even if the sealing part between the base part 7 and the liner is high, and a sufficient oxygen barrier property as a cap is obtained. It may not be possible. In order to increase the barrier property of the liner of this multilayer sheet, since the flexible member has a low barrier property, a method of laminating a resin having a high barrier property between the hard member and the flexible member is taken, but the apparatus becomes large. Not practical. Further, in this case, punched scraps cannot be regenerated.

  On the other hand, in this embodiment, a barrier film is bonded onto the hard sheet 5a, or an inorganic film such as DLC (diamond-like hard carbon film) is bonded or vapor-deposited, and these are punched into a disk shape, and a cap By inserting the shell 4 and molding the soft layer 5b of the flexible member thereon, a cap with improved gas barrier properties can be provided. Alternatively, a material having a barrier property such as nylon, PET, PAN, EVOH can be used for the hard sheet 5a.

  When the beverage packed in the bottle 6 is opened after filling and capping, the beverage is attached to the top surface of the cap 1 and the beverage attached to the inner surface of the cap 1 falls at the same time as opening and stains clothes. Problems occur. In this case, in the in-shell mold type liner, the beverage adhering to the inner surface of the cap 1 gathers in one place by making a certain shape such as a radial or parallel groove or ridge from the center of the liner, forming a large lump. The device is designed not to fall. However, in the case of a multilayer sheet liner, since the surface is flat, it is difficult to apply various shapes to the liner surface. On the other hand, in the present embodiment, when the soft layer 5b is molded, it is easy to give the above-mentioned certain shape.

The conventional sheet liner is directly inserted into the cap shell after being punched out. However, since the liner 5 of the present embodiment is relatively thin compared to this, a non-volatile liquid (silicone oil or glycerin is inserted before punching insertion. Is preferably applied to the inner surface of the cap shell 4, it is possible to improve the adhesion of the liner 5 that has been punched and inserted and to reduce the opening torque value of the cap 1. Further, when the liner 5 is in close contact with the top surface of the cap, advantages such as improvement in gas barrier properties as the cap 1 can be obtained. When the area of the liner 5 is S (cm ² ) and the application amount of the nonvolatile organic liquid is Y (mg), the application amount of the nonvolatile organic liquid is Y = aS as shown in FIG. , A is set in the range of 0.01 to 1.00.

The required application amount of the non-volatile liquid is proportional to the diameter of the cap. If the amount is too small, the barrier effect is not sufficient. If the amount is too large, the liquid oozes from between the liner 5 and the cap shell 4, and when the cap 1 capped in a bottle can is opened, the liquid adheres to the bottle mouth. A phenomenon occurs. The coating amount varies slightly depending on the surface state of the liner 5, but is preferably substantially proportional to the cap diameter. That is, as shown in FIGS. 4 and 5, the distance between the inner side of the outer peripheral edge of the hard sheet 5a and the outer side of the liner locking protrusion 9 is W (mm), and the outer peripheral edge of the hard sheet 5a and the liner locking protrusion. When the distance from 9 is h (mm), h and W are
It is set in a range surrounded by h (mm) = 3 W (mm) +1, h = 0, and W = 2. More preferably, it is set in a range surrounded by h (mm) = 3 W (mm) +0.4, h = 0, and W = 2.

  In addition, the conventional sheet liner is punched out from the sheet into a disk shape at room temperature and inserted into the cap shell 4. At this time, no special heat treatment is applied. In the present embodiment, after the hard sheet 5a is inserted, the sheet liner is melted. Since the flexible liner material is placed on the hard sheet 5a and immediately press-molded to form the soft layer 5b, the surface of the hard sheet 5a is completely aseptic, so that the sanitary excellent cap 1 can be supplied.

  Furthermore, the conventional in-shell mold type is difficult to print on the liner. In contrast, in the present embodiment, the hard sheet 5 a is printed before being punched into a disk shape, and this is inserted into the cap shell 4. And the cap 1 with the printed liner 5 can be supplied by supplying the flexible liner material fuse | melted on it, and press-molding immediately, and forming the soft layer 5b. The liner 5 of the cap 1 is hygienic because the printed surface does not directly contact the contents. This printing is useful when used with a prize cap or the like.

  In the conventional multilayer sheet liner, a disk is punched and inserted from a sheet. However, since a plurality of materials are bonded to the scrap generated at that time, it is very difficult to recycle and use. On the other hand, in the manufacturing method of the present embodiment, the scraps 28 are generated only in the hard portion of the liner material (the scraps 28 of the hard sheet 5a). Therefore, it is easy to recycle them as chips and pellets. . It is also possible to directly recycle the scraps 28 depending on conditions. Therefore, in the manufacturing method of this embodiment, the liner material of the hard sheet 5a can theoretically be used for 100% production.

  Moreover, this embodiment can provide the cap 1 excellent in handling properties such as drop impact resistance. For example, when an impact is applied to a cap by inverting and dropping a filled capped bottle, the conventional in-shell mold type causes a phenomenon that the liner material is separated from the bottle when the displacement between the bottle and the cap is large due to the impact. . On the other hand, in this embodiment, since the liner 5 and the cap shell 4 can move freely, the ratio of the liner 5 that is in close contact with the base portion 7 is dragged by the displacement of the cap shell 4 when subjected to an impact. Since it is few, it shows good drop impact resistance.

  In addition, when the liner 5 of the present embodiment is opened, since it is the inner top surface of the cap shell 4 and the sliding layer (hard sheet 5a) of the liner 5 that slides first, the sealing layer (soft layer 5b) There is no need to slide. For this reason, it is not necessary to add the amount of lubricant necessary for the sealing layer to slide. For this reason, the problem that the bleed lubricant falls on the content does not occur. In addition, there is no problem that the unique odor of the lubricant is transferred to the contents. However, a small amount of an anti-blocking agent, a lubricant or the like may be used for the sealing layer in order to improve the degree of peeling between the sealing layer and the bottle mouth.

  Thus, in this embodiment, since the soft layer 5b more flexible than the hard sheet 5a is formed on the hard sheet 5a by resin molding, a large amount of scraps 28 when the hard sheet 5a is punched into a disk shape is a single layer. In addition to being reusable (recycled), the punched hard sheet 5a has no front and back, and it is not necessary to select the front and back when inserted into the cap shell 4. In addition, since the soft layer 5b and the hard sheet 5a have a multilayer structure, the soft layer 5b can provide a high sealing property, and the liner 5 is formed by the hard sheet 5a having a higher sliding property and a lower frictional resistance than the soft layer 5b. It freely rotates with respect to the cap shell 4 to obtain a good opening property and a drop impact resistance, and it is not necessary to add a large amount of lubricant.

  Furthermore, since only the soft layer 5a is formed by resin molding, various shapes of the soft layer 5a can be obtained, and if necessary, the partial thickness can be individually set to reduce the amount of material used. it can. Further, since the molten soft material is placed on the hard sheet 5b and molded by resin, the liner surface is completely aseptic and a sanitary excellent cap can be obtained. Even when printing is performed on the hard sheet 5a in advance, the printed surface is covered with the soft layer 5b and is not hygienic because it does not directly contact the contents.

  Further, since the soft layer 5b is formed coaxially with the hard sheet 5a and having a small outer diameter and inside the liner locking projection, the soft layer 5b adheres to the mold punch or the base portion 7 and the entire liner is formed. Even if the is pulled, the outer edge portion of the hard sheet 5 a hits the liner locking projection 9 and is locked, and the liner 5 can be prevented from coming off from the cap shell 4.

Furthermore, when the thickness of the hard sheet 5a is t (mm) and the flexural modulus is f (MPa), the soft layer 5b adheres to the mold punch or the die part 7 by setting t × f to 150 or more. Thus, when the hard sheet 5a comes into contact with the liner locking projection 9 by being pulled, it can be prevented from coming off from the liner locking projection 9 due to the high bending elasticity of the hard sheet 5a.
Further, by making the thickness of the portion in contact with the base portion 7 of the soft layer 5b thicker than the other portions, it is possible to obtain a high sealing property, and it is possible to reduce the thickness other than the portion in contact with the mouth portion, Cost reduction can be achieved by reducing the amount of soft material used.

Further, since the positional relationship between the hard sheet 5a and the liner locking projection 9 is set within the above-described range, the contact between the hard sheet 5a and the liner locking projection 9 is prevented, and an increase in opening torque is prevented. The liner 5 can be prevented from falling off.
Moreover, since a non-volatile organic liquid is apply | coated between the top-plate part 2 and the liner 5, the adhesiveness and gas barrier property of the liner 5 can be improved. In particular, since the application amount of the non-volatile organic liquid is set so as to fall within the above-described range, it is possible to obtain an appropriate application amount that does not ooze according to the area of the liner 5 and good gas barrier properties. it can. Furthermore, since the non-volatile organic liquid is silicone oil or glycerin, the gas barrier property is remarkably improved. When glycerin is selected as the non-volatile organic liquid, the kinematic viscosity of the non-volatile organic liquid can be easily adjusted by adding water.

  The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

Next, the manufacturing method of a cap with a liner, a cap with a liner, and a bottle with a cap according to the present invention will be specifically described with reference to practical examples.
For production of the cap shell 4, first, paints such as epoxy phenol and polyester are baked and applied 2 to several times to a thickness of 1 to 10 μm on the inner and outer surfaces of the aluminum alloy plate, and this is punched into a cup shape with a press. And the sewing machine part 10, the knurl 8, the liner latching protrusion 9 etc. are processed into this on a cup side surface. This is referred to as a cap shell 4.

  The liner 5 corresponding to this is a single layer sheet for a hard sheet 5a by using a hard synthetic resin (for example, HDPE, PP, various nylons, PAN, PET, PBT, PC, etc.) using an extruder 25 and a T die 24. 27 is produced. The thickness of the single layer sheet 27 at this time is preferably between 0.1 and 1.0 mm. More preferably, it is in the range of 0.2 to 0.8 mm. This synthetic resin requires a certain rigidity, and preferably has a flexural modulus of 400 MPa or more, although it depends on the thickness. Corona discharge treatment or the like may be performed on the surface of the hard sheet 5a as necessary. The hard sheet 5a may be laminated or coated with an adhesive component in order to adhere the soft layer 5b.

  This single-layer sheet 27 is punched into a disk-shaped hard sheet 5 a and inserted into the cap shell 4. At this time, the diameter of the hard sheet 5 a must be larger than the inner diameter of the liner locking projection 9 and be in a state where it can freely rotate in the cap shell 4. The punching waste 28 at this time is immediately converted into chips and can be used immediately as a raw material for the hard member.

  A certain amount of molten resin for the soft layer 5b extruded from the mold liner machine extruder 29 which is an extruder in the next step is cut into the cap shell 4 into which the hard sheet 5a is inserted, and the hard sheet 5a is centered on the hard sheet 5a. Place and press immediately with a cold punch to form a certain shape as the soft layer 5b. The soft layer 5b at this time shows good results when various elastomers or a blend of resin and elastomer is used. Examples of elastomers include olefin elastomers, styrene elastomers, polyamide elastomers, polyester elastomers, polyurethane elastomers, and vinyl chloride elastomers.

  The flexible member for the soft layer 5b is preferably 50 (D hardness) or less in terms of JIS hardness. More preferably, it is 45 (D hardness) or less. The thickness of the formed sealing layer (soft layer 5b) is preferably 0.1 to 0.8 mm, more preferably 0.2 to 0.6 mm, at least in a portion in contact with the base portion 7.

<Example 1>
Next, the results of a comparative test performed to confirm the effect of the present invention will be described.
In this test, a cap shell 4 having a 38 mm PP cap was formed from an aluminum alloy plate having a thickness of 0.25 mm coated on the inner and outer surfaces. The cap shell 4 was made of an aluminum sheet having an inner surface baked and coated with an epoxy phenol paint containing a polyolefin-based lubricant at 50 mg / dm ² . Then, the polypropylene sheet formed by the extruder 25 and the T-die 24 was punched into a 37.4 mm hard sheet 5 a and inserted into the cap shell 4. The thickness of the hard sheet 5a put in the cap shell 4 was produced by changing the slit width of the T die 24.

  A fixed amount of melted elastomer extruded from the extruder 25 was supplied to the cap shell 4 in which the hard sheet 5a was inserted, and immediately pressed with a cold punch to form a shape as the soft layer 5b. As the elastomer, styrene elastomer blended with PP, liquid paraffin and polymer SEPS was used. Further, several types of the soft layer 5b having different thicknesses of the seal portion (the portion where the liner 5 is in contact with the base portion 7) were produced. At this time, the central portion of the soft layer 5b that is not related to the sealing performance of the cap portion 7 was formed to be as thin as possible.

  In order to examine the characteristics of the cap 1, an aluminum bottle containing 275 g (total amount 338 ml) was filled with water and capped with a test cap. For this capping, a single head capper was used. As the pressure block, a block having a diameter of 35.6 mm and a drawing depth of 1.8 mm was used. The head pressure was capped at 1100N.

  A head space of 63 ml was taken, and the head space portion was replaced with nitrogen gas, sealed, and subjected to a retort treatment at 121 ° C. for 20 minutes. Thereafter, the sealing performance immediately after retorting, the opening torque value after standing at room temperature, the drop impact performance, etc. were examined. The evaluation results are shown in Table 1 below. As a comparative example, Table 1 shows the results of the same evaluation for an in-shell mold type cap.

Note 1) For the sealing performance, the internal pressure before and after the retort was examined, and the presence or absence of leakage was examined based on the change. The table shows the number of moles / number of samples.
Note 2) For the drop impact performance, capping, retorting, and leaving for one day, the bottle is inverted from a height of 30 cm onto an iron plate with a 10 ° angle vertically, and the difference in internal pressure before and after the drop is examined. The number of leaks was examined. Number of samples 10 each. The table shows the number of moles / number of samples.
Note 3) The opening torque is the torque value at the start of rotation (first torque measured with a torque meter) after standing at room temperature for 4 weeks after capping and heat treatment. Unit: N · cm. Average value of 10 samples.

Note 4) PP was random PP. (Bending elastic modulus: 950 MPa)
Note 5) TPS is a styrene elastomer and is a blend of PP, SEBS (styrene ethylene butylene styrene block copolymer) and liquid paraffin.
Note 6) Thickness unit of hard sheet and soft layer (part in contact with the base): mm.
Note 7) Mold suitability indication: ◎ = Good, ○ = Slight dent on the outer periphery of the liner, △ = Scratch on the outer periphery of the liner, × = Scratched part on the outer periphery greatly affects sealability.
Note 8) Supponaku property: ◎ = The liner does not come off from the cap shell when molding, ○ = Slightly lifts the liner, △ = Raises but fits in the cap shell, × = The liner detaches from the cap shell.
Note 9) Drawing depth: Actual measured values when the drawing depth of the pressure block is set to 1.80 mm. Average value of 10 samples. Unit mm.
Note 10) Overall evaluation
◎◎ = Excellent opening torque, sealability, and drop impact resistance.
◎ ○ = Opening torque property, sealing property, and drop impact resistance are good, but the slipping property is slightly inferior.
○ △ = Slightly inferior torque. Sealing performance and drop impact resistance are also slightly inferior.
○ × = Opening torque is slightly inferior. Inferior sealing performance and drop impact resistance.
× ◎ = Opening torque is inferior. Good sealability and drop impact resistance.

  As can be seen from Table 1, the PP of the sliding layer (hard sheet 5a) is 0.2 mm and the sealing layer (soft layer 5b) is TPS compared to the in-shell mold type TPS single liner. Excellent results in plug and drop impact resistance. Further, if the sliding layer (hard sheet 5a) is too thin, there is a possibility that slipping may occur during in-shell molding. Conversely, when the sliding layer (hard sheet 5a) is too thick, it can be seen that the drop impact resistance is inferior. However, even in these cases, there is a merit that it has good openability and can reuse the scraps 28 of the hard sheet 5a.

<Example 2>
The liner of Example 2 was produced in the same manner as in Example 1, and the productivity was compared with a two-layer liner material as a comparative example. In Example 2, similarly to Example 1, the hard sheet 5a was punched from the PP sheet, the scraps 28 were pulverized, mixed with the PP material, and used again as a sheet material. The sheet of the comparative example was formed by extruding PP and styrene elastomer with a two-layer extruder of a sheet molding machine and a T-die, adjusting the thickness with a cooling roller, and cutting it to a certain width. Thereafter, this was punched out into a disk shape of φ37.4 mm and inserted into a cap shell. The punching at this time was performed in such an arrangement that the maximum number could be taken from the sheet. The cap performance at this time and the production efficiency of the liner were compared. However, the standard for comprehensive evaluation is different from that in Example 1. The results are shown in Table 2.

Note 1) The thickness property value of the liner material, the performance as a container, and the evaluation method were the same as those in Example 1. However, the overall evaluation is as follows.
Note 2) Formability evaluation: ◎ = good, ◯ = almost good, △ = slightly problematic, x = poor formability.
Note 3) Material efficiency (%) = (Liner use weight / input liner material amount) × 100
Note 4) Overall evaluation:
◎◎ = Product with high opening efficiency, excellent opening torque resistance, drop impact resistance, and sealing performance.
◎ × = Opening torque, drop impact resistance, and sealing performance are good, but production efficiency is low.

  As a result of Table 2, the material efficiency of the two-layer sheet as a comparative example was on the order of 50%, but in the method of Example 2, the efficiency was nearly 90%. Further, there was no difference in the opening torque, but in the case of the two-layer sheet in terms of sealing performance, when the sliding layer was too thick, leakage was observed in the drop impact.

<Example 3>
In Example 3, a cap shell 4 of a 28 PET bottle resin cap (made of polypropylene) having a liner locking protrusion 9 was formed by an injection molding machine, and from this, an extruder 25 and a T-die 24 were used. A hard sheet 5a punched from the extruded sheet was inserted. The hard sheet 5a at this time is in a state where it moves freely but is stably locked by the liner locking projection 9 formed on the portion near the top surface of the side wall of the resin cap shell 4 when inserted. It has become. An olefin elastomer (ethylene α-olefin copolymer) was in-shell molded as a soft layer.

  In order to examine the characteristics of this cap, a 500 ml PET bottle was filled with hot water at 80 ° C. and sealed with a test cap. For this sealing, a single head capper was used and the tightening torque was set to 200 Ncm. This was cooled, and the opening torque value, drop impact performance, etc. after 1 week at room temperature were examined. These evaluation results are shown in Table 3 below. As a comparative example, a resin cap for 28 PET bottles (made of polypropylene) having an in-shell mold type and a linerless type liner was also tested. The results are also shown in Table 3. The evaluation method was the same as in Example 1. However, the evaluation of the drop impact performance was examined by the change in the position of the liquid surface.

Note 1) Thickness physical properties of liner material, performance as a container, and evaluation method are the same as in Example 1. However, the overall evaluation is as in Note 3.
Note 2) Liner material: HDPE = high density polyethylene, TPO = olefin elastomer.
Note 3) Overall evaluation:
◎◎ = Liner moldability, opening torque and drop impact resistance.
◎ △ = Opening torque and drop impact resistance are good. Liner moldability is slightly inferior.
◎ × = Liner moldability is good, but the opening torque and drop impact resistance are poor.

  As can be seen from Table 3, the cap of Example 3 has a low opening torque and a good value compared to the cap of the in-shell mold type and the linerless type.

<Example 4>
In Example 4, the 38 mm PP cap shell 4 was molded in the same manner as in Example 1, and the coating material used for the cap shell 4 was almost the same as in Example 1. To this, resin sheets of different thickness formed by the extruder 25 and the T-die 24 were punched into a 37.4 mm disk-shaped hard sheet 5 a and placed in the cap shell 4. A fixed amount of melted elastomer extruded from the extruder 25 was supplied to the cap shell 4 in which the hard sheet 5a was inserted in the same manner as in Example 1 and immediately pressed with a cold punch to produce a soft layer 5b. The same elastomer as in Example 1 was used. For the hard sheet 5a, the bending elastic modulus and thickness were measured for each material in order to examine the resistance to slipping.

  In order to examine the characteristics of the cap, the same evaluation as in Example 1 was performed. That is, an aluminum bottle containing 275 g (total amount 338 ml) was filled with hot water at 85 ° C. and capped with a test cap. For this capping, a single head capper was used. As the pressure block, a block having a diameter of 35.6 mm and a drawing depth of 1.8 mm was used. The head pressure was capped at 1100N. A head space of 63 ml was taken, and the head space portion was replaced with nitrogen gas and capped. The head space was 63 ml, and the head space part was replaced with nitrogen gas and sealed. After this, the sealing properties immediately after, the opening torque value after standing at room temperature, the drop impact performance, etc. were examined. The evaluation results are shown in Table 4 below.

Note 1) For drop impact performance, after capping and leaving for one day, the bottle is inverted and dropped from a height of 30 cm onto an iron board with a 10 ° angle vertically, and the difference in internal pressure before and after the drop is examined. Check the number of occurrences. Number of samples 10 each. In the table, the number of moles / number of samples is shown.
Note 2) Opening torque: Torque value at the start of rotation after standing at room temperature for 1 week after capping (first torque measured with a torque meter). Average value of 10 samples. Unit: N · cm.

Note 3) Thickness physical property value, moldability, performance as a container lid, and evaluation method are the same as in Example 1.
Note 4) Unit of flexural modulus: MPa
Note 5) Liner material: PP = polypropylene, HDPE = high density polyethylene, LDPE = low density polyethylene, Ny66 = nylon 66, TPS = styrene elastomer, TPO = olefin elastomer Note 6) Overall evaluation
◎◎ = Excellent liner moldability, opening torque and drop impact resistance.
Δ ◎ = Liner moldability is inferior, but opening torque and drop impact resistance are good.

  As can be seen from Table 3, the cap of the present invention has a low opening torque and a good value compared to the cap of the in-shell mold type and the linerless type. Further, as can be seen from Table 4, in the examples of the present invention, when the flexural modulus is f (MPa) and the thickness of the hard sheet 5a is t (mm), the value of t × f is 150 or more. When the soft layer 5b is molded on the hard sheet 5a, no slipping phenomenon occurs.

<Example 5>
In this test, a cap shell of a 38 mm PP cap was molded using an aluminum alloy plate having a thickness of 0.25 mm coated on the inner and outer surfaces. The cap shell used was an aluminum sheet having an epoxy phenol paint containing a polyolefin-based lubricant baked and applied at 50 mg / dm ² on the inner surface. This was punched out with a press, molded into a 38 mm PP cap shell, and silicone oil or glycerin was used as a non-volatile organic liquid for the cap shell, and the amount was applied to the center of the inner surface of the cap shell in varying amounts.

  And the polypropylene sheet | seat shape | molded with the extruder and T-die was pierce | punched into the hard sheet | seat of diameter 37.4mm, and this was inserted in the cap shell. Sheets with different thicknesses were molded by changing the molding conditions.

  A fixed amount of the melted elastomer extruded from the extruder was supplied to the cap shell into which the hard sheet was inserted, and immediately pressed with a cold punch to produce a shape as a soft layer. As the elastomer, a styrene elastomer blended with PP, liquid paraffin, and polymer SEPS was used. The thickness of the elastomer was changed corresponding to the thickness of the sheet.

  At this time, the central portion of the soft layer that is not related to the sealing performance of the base portion was molded to be as thin as possible. This cap was capped in an aluminum bottle containing 310 g (total amount 350 ml). As the contents, water to which a certain amount of vitamin C was added was used, and 40 ml of the head space portion was taken. This head space was replaced with nitrogen gas, capped and subjected to retort treatment at 121 ° C. for 20 minutes, and then the opening torque, drop impact performance, and vitamin C retention were examined. Further, the degree of the non-volatile organic liquid oozing into the cap was visually observed with the cap whose opening torque was measured.

The same evaluation was performed for the 33PP cap (aluminum plate thickness 0.23 mm, liner outer diameter 32.8 mm) and 28PP cap (aluminum plate thickness 0.22 mm, liner outer diameter 27.4 mm) coated on the inner and outer surfaces. .
The results are shown in Tables 5, 6, and 7.

Note 1. Silicone oil with a viscosity of 1000 cSt is used. Glycerin with a viscosity of 1500 cSt (20 ° C.) is used.
Note 2. The thickness of the in-shell mold part is the average thickness of the part in contact with the container lip part (base part).
Note 3. The sealing property indicates the mole percentage immediately after the retort in which the internal pressure before and after the retort was examined and the presence or absence of the mole was examined based on the change. Number of samples 10 each.
Note 4. For drop impact performance, after capping, retorting, and leaving for one day, the bottle is inverted and dropped from a height of 40 cm onto an iron board with a 10 ° angle vertically, and the difference in internal pressure before and after the drop is examined. The number of occurrences was examined. Number of samples 10 each.

Note 5. The opening torque was the torque value at the start of rotation (first torque was measured with a torque meter) after standing at room temperature for 1 week after capping and heat treatment. Average value of 10 samples. The second torque (torque at the time of breaking the bridge portion) is not described.
Note 6. The amount of vitamin C decreased was measured by filling a bottle with a vitamin C solution of about 100 ppm, leaving it in a thermostatic chamber at 40 ° C. for 1 month after capping and heat treatment, and measuring the consumption of vitamin C with an automatic potentiometric titrator.
Vitamin C retention and its evaluation. ◎ = High retention rate, ○ = Retention rate almost good, X = Retention rate poor.
Note 7. Coating liquid oozing degree: ◎ = No oozing was observed, ◯ = Slightly observed on the side of the liner, X = Liquid oozing up to the cap shell.
Note 8. Comprehensive evaluation: ◎ = No oozing of coating liquid and good oxygen barrier property, ◯ = Oxygen barrier property almost good and no liquid spilling, or good oxygen barrier property and coating liquid oozing liner side surface △ = oxygen barrier is slightly inferior. The coating liquid seeps into the bottle screw from the side of the cap.

  As can be seen from Table 5, the liner of the PP sheet and the in-shell mold type elastomer is improved in oxygen barrier properties by applying a certain amount of non-volatile organic liquid such as silicone oil. In addition, the sealing property and the drop impact resistance are not lowered by this, and the opening property is lowered. In this sheet + mold type liner material, the improvement in oxygen barrier properties by applying a non-volatile organic liquid such as silicone oil between the sheet and the cap shell is less effective if the amount applied is too small. If the amount is too large, bleeding of a non-volatile organic liquid is observed inside the cap shell after capping and retorting.

This appropriate coating amount Y (mg) is proportional to the area S (cm ² ) of the liner and has a relationship of Y = aS. In this case, the value of a is preferably 0.01 to 1, and more preferably 0.02 to 0.9. In the case of no application, the barrier property is slightly improved by increasing the thickness of the PP sheet, but the drop impact performance is decreased.

<Example 6>
In this test, a shell of a 38 mm PP cap was molded using a 0.25 mm alloy plate coated on the inner and outer surfaces. A predetermined amount (2 mg) of silicone oil was applied to the inner surface of the cap shell, and then a liner material was formed in the same manner as in Example 5. Using this cap, capping and retorting were performed in the same way as in Example 5. After measuring the distance between the liner tip and the liner locking projection with an X-ray TV fluoroscope, store and open at 70 ° C. The internal pressure was released and the bottle was immediately closed to the original position, stored at 5 ° C., then opened, and the state of the liner being removed was examined. Several types of cap shells having different positions and sizes (depths) of liner locking protrusions were produced. Moreover, the drawing depth at the time of capping was changed in several steps from 1.0 mm to 3.0 mm. As a result, the positions of the liner and the liner locking projection were changed.

Note 1 W is a dimension between the inner diameter of the PP sheet of the liner after capping and the outside of the tip of the liner locking projection.
Note 2 h is the difference between the tip of the PP sheet and the liner locking projection.
Note 3 Evaluation of liner disengagement state: ◎ = No separation, ○ = One or more of the liners exceeds the liner locking projections, △ = Over half of the liner exceeds the liner locking projections 1 or more, x = one or more liners are recognized. There are 10 samples each.

  From the above results, in order to prevent the liner from dropping or coming off, W is preferably −0.2 mm or more and 1.0 mm or less, more preferably 0.0 mm or more and 1.0 mm or less, and the liner is removed. No. H is preferably 0.0 mm or more and 3.0 mm or less, more preferably 0.0 mm or more and 2.0 mm or less. In addition, it is understood that h and W are preferably in a range surrounded by h (mm) = 3 W (mm) +1, h = 0, and W = 2. More preferably, there is no dropout within a range surrounded by h (mm) = 3 W (mm) +0.4, h = 0, and W = 2.

In one Embodiment of the manufacturing method of the cap with a liner which concerns on this invention, a cap with a liner, and a bottle with a cap, it is the side view which fractured | ruptured a part which shows a cap. In this embodiment, it is the principal part side view which fractured | ruptured a part which shows a bottle with a cap. In this embodiment, it is explanatory drawing which shows the manufacturing process in the manufacturing method of a cap with a liner. In this embodiment, it is sectional drawing to which the principal part of the capping state for demonstrating the positional relationship of a liner and a liner latching protrusion was expanded. In this embodiment, the graph which shows the favorable range of the distance W of the inner side of the outer periphery part of a hard sheet, and the outer side of a liner latching protrusion, and the space | interval h of the outer periphery part of a hard sheet, and a liner latching protrusion It is. In this embodiment, it is a graph which shows the favorable range of the area S of a liner, and the application amount Y of a non-volatile organic liquid.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Cap (cap with liner), 2 ... Top plate part, 3 ... Cylindrical peripheral wall part, 4 ... Cap shell (cap main body), 5 ... Liner, 5a ... Hard sheet, 5b ... Soft layer, 7 ... Base part, 6 ... Bottle with cap, 9 ... Liner locking projection, 13 ... Bottle body

Claims (11)

A method of producing a cap with a liner capable of closing a mouth portion of a container by installing a liner in a cap body composed of a top plate portion and a cylindrical peripheral wall portion hanging from the periphery of the top plate portion,
A hard sheet installation step of inserting a disk-shaped hard sheet in the cap body into a state in contact with the inner surface of the top plate part,
And a soft layer forming step of forming a soft layer softer than the hard sheet on the hard sheet in an inserted state by resin molding. In the manufacturing method of the cap with a liner of Claim 1,
The cylindrical peripheral wall portion is provided with a liner locking projection that protrudes inward at a position spaced from the top plate portion,
In the hard sheet installation step, the hard sheet is inserted between the liner locking projection and the top plate part,
The method for producing a cap with a liner, wherein, in the soft layer forming step, the soft layer is formed coaxially with the hard sheet and inside the liner locking projection with a small outer diameter. In the manufacturing method of the cap with a liner of Claim 2,
When the distance between the inner side of the outer peripheral edge of the hard sheet and the outer side of the liner locking protrusion is W (mm), and the distance between the outer peripheral edge of the hard sheet and the liner locking protrusion is h (mm) , H and W
A method for producing a cap with a liner, characterized in that it is set in a range surrounded by h (mm) = 3 W (mm) +1, h = 0, and W = 2. In the manufacturing method of the cap with a liner as described in any one of Claim 1 to 3,
A method for producing a cap with a liner, wherein t × f is 150 or more when the thickness of the hard sheet is t (mm) and the flexural modulus is f (MPa). In the manufacturing method of the cap with a liner as described in any one of Claim 1 to 4,
A method of manufacturing a cap with a liner, characterized in that a thickness of a portion of the soft layer in contact with the mouth of the container is made thicker than other portions. In the manufacturing method of the cap with a liner as described in any one of Claim 1 to 5,
A non-volatile organic liquid is applied between the top plate and the liner. In the manufacturing method of the cap with a liner of Claim 6,
When the area of the liner is S (cm ² ) and the application amount of the nonvolatile organic liquid is Y (mg), the application amount of the nonvolatile organic liquid is
A method for producing a cap with a liner, wherein Y is set to aS, and a is set in a range of 0.01 to 1.00. In the manufacturing method of the cap with a liner as described in any one of Claim 1 to 7,
The method for producing a cap with a liner, wherein the non-volatile organic liquid is silicone oil or glycerin.   A cap with a liner produced by the method for producing a cap with a liner according to any one of claims 1 to 8. A cap body comprising a top plate portion and a cylindrical peripheral wall portion hanging from the periphery of the top plate portion;
A liner provided on the inner surface of the top plate portion,
The liner is a hard sheet disposed in contact with the inner surface of the top plate portion,
A cap with a liner, characterized by having a multilayer structure including a soft layer formed by resin molding on the hard sheet and softer than the hard sheet. A bottle with a cap with a liner,
The bottle with a cap, wherein the cap with a liner is the cap with a liner according to claim 9 or 10.

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