JP2009208795A - Cap with liner and bottle with cap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain excellence in cap opening performance, sealing performance, suitability for liner setting or the like, in a cap with a liner and a bottle with the cap. <P>SOLUTION: The cap with the liner seals a mouthpiece of the bottle. The cap is equipped with a cap shell 4 formed of a top plate 2 and a cylindrical peripheral wall 3 extending down from the peripheral edge of the top plate 2, and a synthetic resin liner 5 disposed on the internal face of the top plate part 2. The liner 5 is equipped with a disk-like rigid sheet 5a disposed in contact with the inside of the top plate part 2, and a flexible layer 5b laminated to the rigid sheet 5a in a layer and more flexible than the rigid sheet 5a. The flexible layer 5b is concentric with respect to the rigid sheet 5a, has a diameter smaller than the rigid sheet 5a so as to be in contact with at least the mouthpiece, and has an annular or disk-like shape. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cap with a liner and a bottle with a cap, which are excellent in an opening property, a sealing property and suitability for a liner set.

  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 metal cap, a cap shell (cap shell) is formed by repeatedly punching and molding 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 the 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, the oxygen barrier property is 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.

  In contrast, Patent Documents 1 to 4 have conventionally proposed liner materials having a multilayer structure. 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. For example, Patent Document 1 proposes a laminate of PP (polypropylene) resin and elastomer at a certain ratio.

  Further, Patent Document 5 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 Japanese Patent Laid-Open No. 2007-119059 JP 2007-161331 A JP 2007-161332 A JP 2003-321040 A

The following problems remain in the conventional technology.
Among the above-mentioned liner production of caps, a molding method in which a liner material is melted by an extruder and is embossed in a shell is generally used. At this time, an adhesive paint and a liner material applied to the inner surface of the shell are used. 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, a liner material for a multilayer sheet as shown in the above patent document has 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, the liner of this multi-layer sheet is set as close to the cap shell inner diameter as possible in order to prevent dropping after insertion into the cap shell or at the time of opening, but the flexible sealing layer is compressed at the time of sealing. It becomes a structure that protrudes. For this reason, the protruding flexible sealing layer may come into contact with the inner surface of the cap shell, and there is a problem that high torque is expressed when the cap is opened. Further, even if the outer diameter of the liner is made as small as possible, a phenomenon occurs in which the liner deviates from the center of the cap shell during capping and the liner partially contacts the shell to increase the opening torque.

  In addition, as in Patent Document 5, in the case of a liner using an aluminum plate, since the end of the liner is bent and then fitted into the cap shell, bending work is required, resulting in an increase in manufacturing cost. Further, since the strength of the aluminum plate is high, it is difficult to draw the shoulder portion of the cap at the time of capping, and it is difficult to provide a side seal, so that there is a problem that sufficient sealing performance cannot be obtained.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a cap with a liner excellent in unplugging property, sealing property, liner set suitability, and the like, a manufacturing method thereof, and a bottle with a cap.

  The present invention employs the following configuration in order to solve the above problems. That is, the cap with a liner according to the present invention is a cap with a liner that seals the mouth of a bottle, and includes a cap body that includes a top plate portion and a cylindrical peripheral wall portion that hangs down from the periphery of the top plate portion, and the top plate. A liner made of a synthetic resin provided on the inner surface of the part, and the liner is a disc-shaped hard sheet disposed in contact with the inner surface of the top plate part, and the hard sheet laminated on the hard sheet A soft layer, and the soft layer is concentric with the hard sheet and is formed in an annular shape or a disk shape having a smaller diameter than the hard sheet so as to be able to contact at least the mouth. It is characterized by.

In this cap with liner, since the soft layer is concentric with the hard sheet and is formed in an annular shape or a disk shape smaller in diameter than the hard sheet so as to be able to contact at least the mouth, the soft layer is formed by the pressure during capping. Even if deformation occurs, the end portion of the soft layer is separated from the inner surface of the cap shell and the liner locking projection, and the end portion does not come into contact with this to increase the opening torque value. A plug can be obtained. Since it is a synthetic resin liner, it has lower rigidity than conventional liners using aluminum plates, etc., and even if it is flat, it can be easily fitted into the cap shell and the cap shoulder is drawn. Can also be done easily. In the present invention, since the liner end portion is only a hard sheet and has low rigidity, the entire liner can be easily fitted into the cap shell as compared with the case of a two-layer structure of a hard sheet and a soft layer. Further, since the soft layer portion is smaller than the hard sheet, the entire weight of the liner can be reduced as compared with the case where the entire liner has a two-layer structure of the hard sheet and the soft layer.
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.

  Moreover, the cap with a liner of the present invention is characterized in that the hard sheet is formed of a polypropylene resin and the soft layer is formed of a styrene-based elastomer. That is, in this cap with a liner, the hard sheet is made of polypropylene resin, and the soft layer is made of a styrene-based elastomer, so that the sealing property, heat resistance and adhesion between the hard sheet and the soft layer are particularly excellent. .

  The cap with a liner of the present invention is characterized in that t × f is set to 150 or more when the thickness of the hard sheet is t (mm) and the flexural modulus is f (MPa). To do. In other words, this cap with a liner has a mold punch or a container opening by setting t × f to 150 or more when the thickness of the hard sheet is t (mm) and the flexural modulus is f (MPa). When the hard sheet comes into contact with the liner locking projection and is pulled by the soft layer, it can be prevented from coming off the liner locking projection due to the high bending elasticity of the hard sheet.

Also, liner cap of the present invention, the cylindrical peripheral wall portion is provided with a liner locking projection which projects inward to support the liner from the lower surface side, the inner diameter of the cylindrical peripheral wall portion and D _0, the When the protrusion length of the liner locking projection is w, the outer diameter D _{1 of the} hard sheet is set in a range of D ₀ ≧ D ₁ > D ₀ -2w, and the diameter of the center of the mouth is R ₁ . In this case, the outer diameter d _{1 of the} soft layer is set in a range of D ₀ -2w> d ₁ > R ₁ . That is, in this cap with a liner, since the outer diameter of the hard sheet and the outer diameter of the soft layer are set in the above range, the hard sheet can be locked to the liner locking protrusion and prevent the liner from falling off, While the soft layer is in contact with the mouth portion, it is not in contact with the liner locking projection, and an increase in the opening torque can be prevented while maintaining high sealing performance.

  Moreover, the cap with a liner of the present invention is characterized in that a non-volatile organic liquid is applied between the top plate portion and the liner. That is, in this cap with a liner, since the non-volatile organic liquid is applied between the top plate portion and the liner, the adhesion of the liner and the gas barrier property can be improved.

Furthermore, in the cap with a liner of 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 Y = AS, and a is set to be in the range of 0.01 to 1.00. That is, in this cap with a liner, the application amount of the non-volatile organic liquid is set so as to fall within the above range, so that an appropriate application amount that does not ooze out according to the area of the liner and a good gas barrier property. Can be obtained.

  In the cap with a liner of the present invention, the nonvolatile organic liquid is silicone oil or glycerin. That is, in this cap with a liner, 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 bottle of the present invention is a bottle provided with a cap with a liner, wherein the cap with a liner is the cap with a liner of the present invention.
That is, in these caps with a liner and bottles with a cap, a soft layer having a smaller diameter than that of the hard sheet is formed on the hard sheet, and thus, as described above, the cap opening property and the sealing property are excellent.

The present invention has the following effects.
That is, according to the cap with a liner and the bottle with a cap according to the present invention, the soft layer is concentric with the hard sheet and is formed in an annular shape or a disk shape having a smaller diameter than the hard sheet so as to be able to contact at least the mouth. Therefore, even if the soft layer is deformed at the time of capping, it does not come into contact with the inner surface of the cap shell and the like, and a low opening torque can be maintained and a high opening performance can be obtained. In addition, it is easy to fit into the cap shell, and high sealing performance and liner set suitability can be obtained.

  Hereinafter, an embodiment of 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, for example, from a plate material of aluminum or aluminum alloy, and the plate material 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 includes a disk-shaped hard sheet 5a disposed in contact with the inner surface of the top plate portion 2, a soft layer 5b formed in a laminated state by resin molding on the hard sheet 5a and more flexible than the hard sheet 5a, The cap shell 4 is provided with a sealing effect.

As the material of the hard sheet 5a, synthetic resin, PP (polypropylene) resin, HDPE (high density polyethylene), PA (polyamide, commonly known as nylon), PC (polycarbonate), PET (polyethylene terephthalate), PBT (polybutylene terephthalate) PAN (polyacrylonitrile) PVC (polyvinyl chloride) and the like can be used.
The soft layer 5b is made of TPS (styrene elastomer, TPO (olefin elastomer), TPU (urethane elastomer), TPEA (polyamide elastomer), TPEE (polyester elastomer), PVC-TPE (polyethylene). A vinyl chloride elastomer) can be used.
Examples of the material combination of the hard sheet 5a and the soft layer 5b that can be bonded by an in-shell mold include the following.

<Hard sheet><Softlayer>
a. PP TPS, TPO
b. HDPE TPS, TPO
c. PA TPEA
d. PVC PVC-TPE
e. TPU TPU
f. PET, PBT TPEE

In particular, a material combination in which the hard sheet 5a is formed of a polypropylene resin and the soft layer 5b is formed of a styrene elastomer is preferable. That is, PP (polypropylene) resin is inexpensive and excellent in heat resistance, and is most suitable as a material for the hard sheet 5a serving as a sliding layer. In addition, TPS (styrene elastomer) is excellent in adhesiveness with PP resin, has good retort resistance, and is optimal as a material for the soft layer 5b.
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 concentric with the hard sheet 5a and is formed in an annular shape or a disk shape having a smaller diameter than the hard sheet 5a so as to be able to contact at least the base portion 7. Note that the soft layer 5b may be formed in an annular shape having a smaller diameter than the hard sheet 5a.

  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, the inner diameter of the cylindrical peripheral wall 3 and _{D 0,} when the projection length of the liner locking projection 9 (pushing amount) was w, the outer diameter _{D 1} of the rigid sheet 5a _{is, D 0 ≧ D 1> D} 0 It is set in a range of -2w, when the diameter of the base part center and _{R 1,} the outer diameter _{d 1} of the soft layer 5b _is set to a range of at _{D 0 -2w> d 1> R} 1.

Further, a non-volatile organic liquid is applied between the top plate portion 2 and the liner 5. As the nonvolatile organic liquid, silicone oil or glycerin is preferable.
Furthermore, 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, and a is 0.01 to It is set to fall within the range of 1.00.

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. The aluminum plate may be subjected to a surface treatment such as chromate treatment or allodyne treatment. In this case, the size coat can be omitted. 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. Further, the step of inserting the disk into the cap shell 4 may be performed before the slit (knurl 8), the hook (liner locking projection 9) or the like is formed in the cap shell 4. In this case, the disc is not damaged by the hook, and insertion failure does not occur.

  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 the present embodiment, first, the cap shell 4 rotates without sliding the liner 5 after sliding between the hard sheet 5a which is the liner hard layer and the cap shell 4. At the same time, the liner 5 is pulled up 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.

  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, in the conventional in-shell mold type, if the displacement between the bottle and the cap is large due to the impact, a phenomenon that the liner material separates from the bottle occurs. . On the other hand, in this embodiment, since the liner 5 and the cap shell 4 are in a freely movable state, 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.

  As described above, in the present embodiment, the soft layer 5b is concentric with the hard sheet 5a and is formed in an annular shape or a disk shape having a smaller diameter than the hard sheet 5a so as to be able to contact at least the base part 7. Even if the soft layer 5b is deformed by the pressure of the time, the end of the soft layer 5b is separated from the inner surface of the cap shell 4 and the liner locking projection 9, and the end contacts the opening and opening torque. High openability can be obtained without increasing the value.

  Since the liner 5 is made of synthetic resin, it has lower rigidity than a conventional liner using an aluminum plate or the like, and can be easily fitted into the cap shell 4 even if it is flat, and the shoulder portion of the cap Drawing can also be performed easily. Further, since the end portion of the liner 5 is only the hard sheet 5a and has low rigidity, the entire liner can be easily fitted into the cap shell 4 as compared with the case of the two-layer structure of the hard sheet 5a and the soft layer 5b. . Furthermore, since the soft layer 5b portion is smaller than the hard sheet 5a, the entire weight of the liner 5 can be reduced as compared with the case where the entire liner has a two-layer structure of the hard sheet 5a and the soft layer 5b.

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 high openability and drop impact resistance, and it is not necessary to add a large amount of lubricant.
In addition, since the soft layer 5b is formed on the hard sheet 5a by resin molding, a large amount of scrap when the hard sheet 5a is punched into a disk shape is a single layer, and can be reused (recycled). When the resin molding is performed after the 5a is inserted into the cap shell 4, the punched hard sheet 5a has no front and back, and it is not necessary to select the front and back when inserting into the cap shell 4.

  Furthermore, since only the soft layer 5b is formed by resin molding, various shapes of the soft layer 5b 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 5a and molded with resin, the surface of the hard sheet 5a is completely aseptic and a hygienic cap is 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.

In addition, since the outer diameter of the hard sheet 5a and the outer diameter of the soft layer 5b are set in the above-described range, the hard sheet 5a is locked to the liner locking protrusion 9 to prevent the liner 5 from falling off. While the layer 5b is in contact with the base portion 7, it is not in contact with the liner locking projection 9, and an increase in the opening torque can be prevented while maintaining high sealing performance.
In addition, when the hard sheet 5a is formed of a polypropylene resin and the soft layer 5b is formed of a styrene-based elastomer, the sealing property, heat resistance, and adhesion between the hard sheet 5a and the soft layer 5b are particularly excellent. .

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 of the soft layer 5b in contact with the base portion 7 thicker than that of the other portions, it is possible to obtain high sealing performance, and it is possible to reduce the thickness except for the portion in contact with the base portion 7. The cost can be reduced by reducing the amount of soft material used.

  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 cap with a liner and the bottle with a cap according to the present invention will be specifically described with reference to an actually produced example.
The cap shell 4 is produced by first coating the inner and outer surfaces of an aluminum alloy plate with an epoxy phenol, polyester or other paint at a thickness of 1 to 10 μm twice or several times, and punching it into a cup 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 molded by the extruder 25 and the T-die 24 was punched into a 37.8 mm hard sheet 5a and inserted into the cap shell 4 having an inner diameter of 38.05 mm. The cap shell 4 is formed with 12 liner locking hooks (liner locking projections 9) protruding inward at a length of 1.0 mm substantially horizontally with the top surface. The position of the hook was 1.5 mm from the top of the cap. An automatic liner insertion machine was used for insertion.

Several thicknesses of the hard sheet 5a made of polypropylene were prepared by changing the thickness interval of the T-die and the interval of the rolling rollers.
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. The elastomer was molded so as to be approximately 1.0 mm in total with the PP sheet. As the elastomer, a styrene elastomer blended with PP, liquid paraffin, and polymer SEPS was used. 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 investigate the characteristics of the cap 1, an aluminum bottle containing 275 g (total amount: 338 ml) was filled with water, liquid nitrogen was dropped into the head space portion to replace the air, and sealing was performed with a test cap. This sealing used a single head capper. As the pressure block, a block having a diameter of 35.6 mm and a drawing depth of 1.6 mm was used. The head pressure was capped at 1000N.

This was subjected to a retort treatment at 121 ° C. for 20 minutes and allowed to stand at room temperature for 1 week, and then the opening torque value was measured. Moreover, the set suitability (liner set suitability) when these liners 5 were inserted into the cap shell 4 with an automatic insertion machine was also evaluated. In addition, the presence or absence of the liner 5 being removed at the time of opening was also evaluated. These evaluation results are shown in Table 1 below.
In addition, as a comparative example, a sliding layer (hard sheet) and a sealing layer (soft layer) formed by coextrusion and bonded to form a two-layer sheet were punched to a constant diameter and inserted into the cap shell 4 I used something. At this time, the sliding layer and the sealing layer were provided with the same thickness as in this example.

Note 1. Sliding layer: Polypropylene homotype is used.
Note 2. Sealing layer: TPS (styrene elastomer) = PP, SEPS (styrene ethylene propylene styrene block copolymer) and liquid paraffin blend.
Note 3. Liner set suitability = The result of suitability evaluation when the liner is inserted into the cap shell using an automatic liner inserter. 30 samples each.
○ = All liners are locked to all hooks.
Δ: Some liners do not hang on hooks.
X = Some liners do not hang on the hook.
Note 4. Liner detachment property = the rate at which the liner detaches from the cap when opened.
○ = All liners are not detached at the time of opening.
Δ: Some liners come off the hook when opening.
× = Some liners fall off the cap shell when opening.
30 samples each.
Note 5. The opening torque is the torque value at the start of rotation after the retort treatment for one week, and the torque value at the start of rotation (the first torque (value at which the cap starts to move) is measured with a torque meter) Average value, maximum value, and minimum value of 30 samples.
Note 6. Comprehensive evaluation ○ = Opening torque property, little variation, no liner dropout, good liner set suitability.
Δ: Good opening torque, but suitable for liner set, and liner slippage occurs slightly.
× = There is variation in opening torque, and the liner set is not suitable.

  From the above results, even when the sliding layer (hard sheet) has the same thickness, the liner of the present invention is more suitable for setting a liner to a cap shell than a conventional two-layer sheet. Further, it can be seen that the opening torque of the conventional two-layer sheet has a large maximum value and a high average value.

<Example 2>
The liner of the present invention was produced in the same manner as in Example 1, and compared with a conventional two-layer liner material as a comparative example. In the present invention, a sliding layer (hard sheet) having a different outer diameter was prepared, inserted into a cap shell, and then a sealing layer (soft layer) was molded by an in-shell mold method. In addition, the dimension of the sliding layer (hard sheet) was prototyped by estimating the upper limit value and the lower limit value of the present invention, and inserted into the cap shell. These were evaluated in the same manner as in Example 1. As a comparative example, a conventional two-layer sheet was used. In addition, the sheet of the comparative example is obtained by extruding and bonding PP and styrene elastomer similar to Example 1 from a double layer extruder and a T die of a sheet molding machine, adjusting the thickness with a cooling roller, and having a certain width. After being cut into pieces, they were punched into disc shapes having the dimensions of each outer shape and inserted into cap shells.

Note 1. An inner diameter of the cap shell of the liner fitting portion is φ38.05 mm.
Note 2. In the comparative example, a sheet in which an elastomer and a PP resin are bonded is punched out, and a disc-shaped sheet is inserted. In this case, the outer diameter of the sliding layer (hard sheet) and the outer diameter of the sealing layer (soft layer) are the same.
Note 3. Liner set suitability = The result of suitability evaluation when the liner is inserted into the cap shell using an automatic liner inserter. 30 samples each.
○ = Liner is locked to all hooks.
Δ: Some liners do not hang on hooks.
X = Some liners do not hang on the hook.
Note 4. Liner detachment property = the rate at which the liner detaches from the cap when opened.
○ = The liner does not detach at the time of opening.
Δ: Some liners come off the hook when opening.
× = Some liners fall off the cap shell when opening.

From the above results, when the height and length of the hook are made constant, the liner of the present invention is superior to the conventional two-layer sheet liner, and the liner set suitability is excellent, and the sliding layer (hard sheet) is the cap shell. Even if it is almost the same as the inner diameter, the liner is properly set in the cap shell and slides sufficiently.
In addition, the conventional two-layer sheet liner has a sealing layer (soft layer) that has the same outer diameter as the sliding layer (hard sheet). If the diameter is used, stable liner insertion properties cannot be obtained.

In addition, after sealing, the conventional two-layer sheet liner shows a high opening torque value (the maximum value is large) when the sealing layer (soft layer) contacts the hook (liner locking protrusion) or the side of the cap shell when opening. ), And the average value is high. Further, when the outer diameter of the sliding layer (hard sheet) is small, the liner comes off. However, the liner of the present invention is less likely to fall off the liner than the conventional two-layer sheet liner.
Further, settable dimension _{D 1} of the outer diameter of the liner _is D _1> D 0 -2w. In this case, since D ₀ = 38.05 and w = 1.5, D ₁ > 35.05 (mm).

<Example 3>
In this test, a cap shell of 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. As the cap shell, 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 was used. 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.

  Then, a polypropylene sheet molded with an extruder and a T-die was punched into a hard sheet having a diameter of 37.6 mm, and this was inserted into a cap shell. In addition, the surface state of the hard sheet put in the cap shell was produced so that the influence of the cooling roller was small at the time of molding. 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 bond and produce a shape as a soft layer.

  As the elastomer, 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 cap portion was molded to be as thin as possible. This cap was capped in an aluminum bottle containing 275 g (total amount 340 ml). The contents used water to which a certain amount of vitamin C was added, 40 ml of head space was taken, the head space portion was replaced with nitrogen gas, and capping was performed.

The drawing depth was all 1.6 mm and the head pressure was 1000 N. This was subjected to a retort treatment at 121 ° C. for 20 minutes, and then the opening torque, drop impact performance, and vitamin C retention were examined. In addition, the degree of oozing of the non-volatile liquid into the cap was visually observed with the cap whose opening torque was measured.
Similarly, the same evaluation was performed on 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 inner volume and the total volume of the container are almost the same as those of the 38PP cap.

Note 1. Uses a silicone oil viscosity of 1000 cSt. Glycerin is 1500 cSt (20 ° C.).
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. For the sealing performance, the internal pressure before and after the retort was examined, and the presence or absence of leakage was examined by the change. Shows the mole percentage immediately after retorting. 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 30 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 one 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 about 100 ppm of vitamin C solution, capping, leaving it in a constant temperature room for 40 months after heat treatment, and measuring the consumption of vitamin C with an automatic potentiometric titrator. Vitamin C retention and its evaluation.
○ = High retention rate.
Δ = Retention rate almost good.
× = Retention rate is inferior.
Note 7. Exudation degree of coating solution ○ = No exudation observed.
Δ = Slightly recognized on the side of the liner.
X = Exudation of liquid to the cap shell is recognized.
Note 8. Comprehensive evaluation ○ = The coating liquid does not ooze out and has good oxygen barrier properties.
Δ = Oxygen barrier property almost good and no liquid oozes, or oxygen barrier property good and liquid oozes up to the side of the liner.
X = Oxygen barrier is inferior, or bleeding of the coating liquid is seen from the side of the cap to the bottle screw part.

As can be seen from Tables 3, 4, and 5 above, the liner made of PP sheet and in-shell mold type elastomer is improved in oxygen barrier properties by applying a certain amount of non-volatile 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, the improvement in oxygen barrier properties by applying a non-volatile liquid such as silicone oil between the sheet and the cap shell is less effective if the amount applied is too small, but too much. After capping and retorting, bleeding of non-volatile liquid is observed inside the cap shell. The appropriate coating amount Y (mg) has a relationship of Y = aS in proportion to the area S (cm ² ) of the liner, and the value of a is preferably 0.01 to 1, more preferably 0.8. 02 to 0.9. In the case of no application, the barrier property is slightly increased by increasing the thickness of the PP layer, but the drop impact performance is deteriorated by increasing the thickness.

<Example 4>
Using a polypropylene resin cap having an outer diameter of 42 mm, the moisture permeability was compared for a cap in which the liner of the present invention and a two-layer sheet liner as a comparative example were inserted. That is, a resin cap test sheet was inserted and capped into a glass bottle containing a certain amount of calcium chloride. The capping tightening torque was all 350 N · cm, and this was put in a desiccator with a humidity of 95%, and the weight change after one month was measured. Moreover, the opening torque after one month was measured. The number of samples is 10 each.

  The inner diameter of the liner portion of the cap was 38.8 mm, and the outer diameter of the liner was evaluated by changing the dimensions of the sliding layer (hard sheet) to evaluate the insertability and liner dropout. At this time, the inner diameter of the hook (liner locking projection) is 37.8 mm, the height of the hook is 1.5 mm, and it is continuously formed on the circumference. At this time, a certain amount of silicone oil was applied between the cap shell and the liner.

Note 1. The comparative example is a two-layer sheet liner.
Note 2. Sliding layer (hard sheet) material = polypropylene resin.
Note 3. Sealing layer (soft layer) material = TPS (styrene elastomer).
Note 4. Cap shell material = polypropylene resin.
Note 5. Silicone oil with 1000 cps is used.
Note 6. Exudation degree of coating solution ○ = No exudation observed.
Δ = Slightly recognized on the side of the liner.
X = Exudation of liquid to the cap shell is recognized.
Note 7. Moisture permeability evaluation ○ = Good (0 to 10 mg or less)
Δ = Slightly good (11 to 20 mg or less)
X = Poor (21 mg or more)
Note 8. Liner set suitability = The result of suitability evaluation when the liner is inserted into the cap shell using an automatic liner inserter. 30 samples each.
○ = Liner is locked to all hooks.
Δ: Some liners do not hang on hooks.
X = Some liners do not hang on the hook.
Note 9. Liner detachment property = the rate at which the liner detaches from the cap when opened.
○ = The liner does not detach at the time of opening.
Δ: Some liners may come off the hook when opening.
× = Some liners fall off the cap shell when opening.

  From the above results, when silicone oil is applied between the cap shell and the liner, the moisture permeability can be suppressed to a low value. Moreover, the opening torque is more stable than a conventional two-layer sheet having substantially the same conditions. In the conventional two-layer sheet, since the sealing layer (soft layer) is in contact with the side surface of the cap shell, the maximum value is high and the variation is large.

<Example 5>
In this test, a cap shell of a 38 mm PP cap was molded from an aluminum alloy plate having a thickness of 0.25 mm and coated on the outer and inner surfaces. In this cap shell, an aluminum sheet having an inner surface baked and coated with an epoxy phenol paint containing Teflon (registered trademark) lubricant at 50 mg / dm ² was used. And the polypropylene sheet | seat shape | molded with the extruder and T-die was pierce | punched into the hard sheet | seat of 37.8 mm, and this was inserted in the cap shell. In addition, the thickness of the hard sheet put in the cap shell was produced by changing the slit width of the T die.

  A fixed amount of the molten 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 form a shape as a soft layer. As the elastomer, styrene elastomer blended with PP, liquid paraffin and polymer SEPS was used. In addition, several types were produced in which the thickness of the seal portion (the portion where the liner is in contact with the base portion) of the soft layer is different. At this time, the central portion of the soft layer that is not related to the sealing performance of the cap portion was molded to be as thin as possible.

  In order to investigate the characteristics of this cap, an aluminum bottle containing 275 g (total amount 338 ml) was filled with water and sealed with a test cap. This sealing used a single head capper. 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 sealed at 1100N.

  63 ml of the head space was taken, the head space part was replaced with nitrogen gas, sealing was performed, and a retort treatment at 121 ° C. for 20 minutes was added. Thereafter, the sealing property immediately after retorting, the opening torque value after standing at room temperature, the drop impact performance, etc. were examined. These evaluation results are shown in Table 7 below. As a comparative example, Table 7 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 by the change. The table shows the number of moles / number of samples.
Note 2. For drop impact performance, after capping, retorting, 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. The number of occurrences was examined. Number of samples 10 each. The table shows the number of moles / number of samples.
Note 3. The opening torque was a torque value at the start of rotation (first torque was 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. As the PP, a random PP was used. (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. Unit of thickness of hard sheet and soft layer: mm.
Note 7. Indication of mold aptitude ◎ = Good.
○ = Slightly dented on the outer periphery of the liner.
Δ: Chipping occurred on the outer periphery of the liner.
× = Outer peripheral part chipped part greatly affects sealing performance.
Note 8. Supponuke property ◎ = The liner does not come off the cap shell when molding.
○ = Slightly lifted liner.
△ = Lifted up but fit in cap shell.
X = The liner is detached from the cap shell.
Note 9. Aperture depth: Actual measurement values when the aperture depth of the pressure block is set to 1.80 mm. Average value of 10 samples. Unit mm.
Note 10. Comprehensive evaluation ◎◎ = Excellent opening torque, sealability, and drop impact resistance.
◎ ○ = Opening torque property, sealing property, drop impact resistance performance is good, but slipperiness is slightly inferior.
○ △ = Opening torque is good, but drop impact resistance is slightly inferior and mold suitability is somewhat inferior.
○ × = Slightly inferior opening torque, poor sealing performance and drop impact resistance.
× ◎ = Opening torque is inferior, sealing performance and drop impact resistance are good.

  As can be seen from the above table, the sliding layer (hard sheet) has a PP of 0.2 mm or more and the sealing layer (soft layer) is TPS. Excellent results in drop impact resistance. On the other hand, if the sliding layer (hard sheet) is too thin, slipping will occur during in-shell molding. Conversely, when the sliding layer (hard sheet) is too thick, it can be seen that the drop impact resistance is poor. However, even in these cases, there is a merit that it has good openability and can reuse the scraps of the hard sheet.

<Example 6>
The liner of Example 6 was produced in the same manner as in Example 5, and the productivity of the two-layer liner was compared as a comparative example. In Example 6, as in Example 5, a hard sheet was punched from the PP sheet, the scrap was 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 into a disk shape of φ37.8 mm and inserted into the 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 5. The results are shown in Table 8.

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 5. However, the overall evaluation is as follows.
Note 2. Formability evaluation ◎ = Good.
○ = Almost good.
Δ: Somewhat problematic.
* = Formability defect.
Note 3. Material efficiency (%) = (Liner use weight / input liner material amount) × 100.
Note 4. Comprehensive evaluation ◎◎ = Opening torque, drop impact resistance, good sealing, and high production efficiency.
◎ × = Opening torque, drop impact resistance, and sealing performance are good, but production efficiency is low.

  As a result of Table 8 above, the material efficiency of the two-layer sheet as a comparative example was on the order of 50%, but in the method of Example 6, the efficiency was nearly 90%. Further, although there was no difference in the opening torque, in the case of a two-layer sheet in terms of sealing performance, when the sliding layer (hard sheet) was too thick, leakage was observed in the drop impact.

<Example 7>
In Example 7, a 38 mm PP cap shell was molded in the same manner as in Example 5, and the coating material used for the cap shell was almost the same as in Example 5. To this, resin sheets with different thicknesses formed by an extruder and a T-die were punched into a 37.8 mm disk-shaped hard sheet and placed in a cap shell. A fixed amount of molten elastomer extruded from an extruder was supplied to the cap shell into which the hard sheet was inserted in the same manner as in Example 5 and immediately pressed with a cold punch to produce a soft layer. The same elastomer as in Example 1 was used. For the hard sheet, the flexural modulus and thickness were measured for each material in order to examine the slip resistance.

  In order to examine the characteristics of the cap, the same evaluation as in Example 5 was performed. That is, an aluminum bottle containing 275 g (total amount 338 ml) was filled with hot water at 85 ° C. and sealed with a test cap. This sealing used a single head capper. 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 sealed at 1100N. 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. These evaluation results are shown in Table 9 below.

Note 1. For drop impact performance, after capping and standing for one day, the bottle is dropped vertically on an iron plate with a 10 ° angle vertically from a height of 30 cm, and the difference in internal pressure before and after the drop is examined to determine the number of leaks. Examined. 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. The thickness physical property value, moldability, performance as a container lid, and the evaluation method are the same as those in Example 5.
Note 4. Unit of flexural modulus: MPa.
Note 5. Liner: PP = polypropylene, HDPE = high density polyethylene, LDPE = low density polyethylene, Ny66 = nylon 66, TPS = styrene elastomer, TPO = olefin elastomer.
Note 6. Overall evaluation ◎◎ = 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 9, even in the examples of the present invention, when the flexural modulus is f (MPa) and the thickness of the hard sheet is t (mm), the hard sheet has a value of t × f of 150 or more. When molding a soft layer on top, no slipping phenomenon occurs.

In one Embodiment of the cap with a liner and bottle with a cap concerning this invention, 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 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 ( Mouth), 6 ... bottle with cap, 9 ... liner locking projection, 13 ... bottle body

Claims (8)

A cap with a liner that seals the mouth of the bottle,
A cap body comprising a top plate portion and a cylindrical peripheral wall portion hanging from the periphery of the top plate portion;
A synthetic resin liner provided on the inner surface of the top plate portion,
The liner is a disc-shaped hard sheet disposed in contact with the inner surface of the top plate portion, and
A soft layer laminated on the hard sheet and more flexible than the hard sheet,
A cap with a liner, wherein the soft layer is concentric with the hard sheet and is formed in an annular shape or a disk shape having a smaller diameter than the hard sheet so as to be able to contact at least the mouth. The cap with a liner according to claim 1,
The hard sheet is formed of polypropylene resin;
A cap with a liner, wherein the soft layer is formed of a styrene-based elastomer. In the cap with a liner according to claim 1 or 2,
A liner-equipped cap, wherein t × f is set to 150 or more when the thickness of the hard sheet is t (mm) and the flexural modulus is f (MPa). In the cap with a liner according to any one of claims 1 to 3,
The cylindrical peripheral wall portion includes a liner locking protrusion that protrudes inward and supports the liner from its lower surface side,
The inner diameter of the cylindrical peripheral wall portion and D _0, the projection length of the liner locking projection upon a w, the outer diameter D ₁ of the said rigid sheet is in the range of _{D 0 ≧ D 1> D 0} -2w Set,
When the diameter of the opening portion center and R _1, the outer diameter d ₁ of the soft layer, D 0 _-2w> d 1> lined cap, characterized in that it is set to a range in R _1. In the cap with a liner as described in any one of Claim 1 to 4,
A cap with a liner, wherein a non-volatile organic liquid is applied between the top plate portion and the liner. The cap with a liner according to claim 5,
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 cap with a liner, wherein Y is set to aS and a is in the range of 0.01 to 1.00. In the cap with a liner according to claim 5 or 6,
The cap with liner, wherein the nonvolatile organic liquid is silicone oil or glycerin. 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 any one of claims 1 to 7.

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