JP2008050031A - Cap and bottle with cap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain good gas barrier properties, sealing properties and the like in a cap and a bottle with the cap. <P>SOLUTION: A cap shell 4 which is composed of a top plate part 2 and a cylindrical peripheral wall part 3 hung vertically from the peripheral edge of the top plate part 2 and made of a metal or a synthetic resin, and a plate-like liner 5 provided on the inner face of the top plate part 2 and made of a synthetic resin, are provided, and a non-volatile organic liquid L is applied between the top plate part 2 and the liner 5. Thereby, high gas barrier properties can be obtained by suppressing invasion of gas by the non-volatile organic liquid L, and torque for opening a plug can be decreased by sliding effect caused by the existence of the non-volatile organic liquid L. In addition, as the gas barrier properties is high, a liner 5 with high sealing properties can be selected. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a cap excellent in gas barrier properties 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 metal cap, a cap shell (cap shell) is formed by repeatedly punching and molding several times on both sides of aluminum thin plate, tin thin plate, chrome-plated thin plate (TFS), etc., and pre-formed into a disk shape. A method of inserting a thin article (disc molded product), a method of thermally bonding a disk molded product at the center after insertion, a method of pouring a liner material into a cap shell like a vinyl sol, and bonding at the same time as gelation by heating, melting There is a method in which resin is put in a cap shell and embossed.

  For synthetic resin caps, the cap shell is molded by injection molding, etc., and a disk-shaped liner is inserted into the cap shell in the same way as a metal cap, or molten resin is placed in the cap shell and immediately pressed. Thus, a method is adopted in which a certain shape is formed and at the same time the liner and the cap shell are bonded. These liner materials are inferior in gas barrier properties because they are required to have a sealing property, but there are many blend materials of flexible PE (polyethylene) or PP (polypropylene) and elastomer.

  The above-mentioned cap liner material is made of a foamed polyethylene disk, EVA (ethylene / vinyl acetate copolymer), LDPE (low density polyethylene) or a blended sheet thereof as a disk insertion method, or as a casting method. As a material for the method of embossing plasticized vinyl chloride, rubber latex, and molten resin in a shell (so-called in-shell molding method), EVA, polyethylene, blended material of polyethylene and elastomer, and heat-resistant liner material PE, PP and oil, blend material of styrene block copolymer, and the like are used. These are all thermoplastic resins alone or blends of thermoplastic resins and elastomers.

  Although these show good sealing properties, they have some common drawbacks as liner materials. That is, these cap shell and liner are firmly bonded or adhered. Even when a disc-shaped liner is inserted, the liner is in close contact with the inner top surface and the side surface of the cap shell. For this reason, in the cap that rotates and opens, the liner rotates simultaneously with the cap shell when the cap is opened. Accordingly, at least the torque required for the container (bottle) and the liner to slide is required as the opening torque. However, the force required for the cap liner and the container mouth to slide is relatively large, and sometimes even a normal adult may find it difficult to open the cap.

For this reason, normally, a liner is put in the liner material so that the liner and the container mouth portion are easily slipped when opened. In this lubricant, a fatty acid amide is generally used, which oozes out on the liner surface and smoothes the sliding with the container mouth, and plays a role in reducing the opening torque. However, it is difficult to control the amount of oozing out of this lubricant, and if the amount of oozing is small, sufficient lubricity cannot be obtained, and if it is too large, the lubricant oozing out on the liner surface falls on the surface of the container contents, There is a problem of being recognized as a foreign object.
In addition, the lubricant has impurities derived from its synthesis, and they often cause a strange odor and taste of the contents. There are also liquids such as silicone oils, but these are insoluble, so when they are transferred to the contents, they may float on the surface to give an unpleasant feeling to the consumer.

  As one method of dealing with this, there is a conventional method of opening the plug by sliding between the liner material and the cap shell at the time of opening, as disclosed in Patent Document 1, for example. In the technique described in Patent Document 1, the heat-resistant liner is attached in a non-contact state to the inside of the top surface wall of the cap body, and the side wall in the vicinity of the top surface wall of the cap body is in a non-contact state with the top surface wall. The heat-resistant liner is provided with a protrusion that can be locked by the periphery. In this method, since the heat-resistant liner and the inside of the top wall of the cap body are not in contact with each other, the rotational torque at the time of opening can be reduced.

JP 2004-217295 A

  The following problems remain in the conventional technology. That is, the technique described in Patent Document 1 is effective as a means for reducing the rotational torque at the time of opening, but the liner material used is generally blended with a flexible resin or elastomer, and these are generally gas barrier properties. Has the disadvantage of being inferior. As a countermeasure, in the case of a sheet liner, a method of pasting a film having a gas barrier property on the surface is also taken, but in this method, the barrier film layer comes into contact with the bottle opening. In this case, since the barrier film has higher hardness than an elastomer or the like, the liner material to which the barrier film is bonded has a drawback that the sealing property is remarkably inferior. Thus, a method for simultaneously solving the gas barrier property and the sealing property has not been obtained so far. Furthermore, in the case of a multilayer liner material, there is a method of laminating a resin having a barrier property such as eval, nylon, PET, and aluminum foil in the middle, but there is a disadvantage that the cost is increased.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide a cap and a bottle with a cap that can have both good gas barrier properties and sealing properties.

The present invention employs the following configuration in order to solve the above problems. That is, the cap of the present invention is a metal or synthetic resin cap body comprising a top plate portion and a cylindrical peripheral wall portion depending from the periphery of the top plate portion, and a plate provided on the inner surface of the top plate portion. And a liner made of synthetic resin, and a non-volatile organic liquid is applied between the top plate and the liner.
In this cap, since the non-volatile organic liquid is applied between the top plate portion and the liner, the non-volatile organic liquid suppresses the intrusion of gas, and high gas barrier properties are obtained. The opening torque can be reduced by the slippery effect due to the interposition of. Further, since the gas barrier property is high, it is possible to select a liner having a high sealing property.

  The cap of the present invention has a multilayer structure in which the liner has at least a hard layer disposed on the top plate portion side and a soft layer that is laminated on the hard layer and is softer than the hard layer. A characteristic organic liquid is applied between the top plate portion and the hard layer. That is, in this cap, since a liner having a multilayer structure having a hard layer having slidability between the cap shell and a soft layer having sealing properties between the cap portion is used, the gas barrier property is ensured. Therefore, it is possible to further increase the sealing performance (enhancement of sealing performance) and reduce the opening torque (improvement of sliding performance).

  In the cap of the present invention, the nonvolatile organic liquid is preferably silicone oil or polybutene. That is, in this cap, the gas barrier property is remarkably improved by selecting silicone oil or polybutene as the nonvolatile organic liquid.

  The cap of the present invention is characterized in that the nonvolatile organic liquid is glycerin. That is, in this cap, since glycerin is selected as the non-volatile organic liquid, the cap has high gas barrier properties, and the kinematic viscosity of the non-volatile organic liquid can be easily adjusted by adding water.

In the cap of the present invention, the application amount of the non-volatile organic liquid is such that the arithmetic average roughness on the top plate portion side surface of the liner is Ral (μm), and the arithmetic average roughness on the inner surface of the top plate portion is When the thickness is Ras (μm), and the area of the liner side surface of the liner is S (mm ² ),
W (mg) = 2/3 × 10 ⁻³ S (Ral + Ras)
It is characterized by being 5% or more and 250% or less of the weight W represented by
That is, in the cap, the application amount of the non-volatile organic liquid is set in the range of 5% to 250% of the weight W represented by the above formula, so that sufficient gas barrier property and appropriate opening torque are provided. Obtainable. That is, when the coating amount is less than 5% of the weight W, sufficient gas barrier properties and lubricity effects cannot be obtained. When the coating amount exceeds 250% of the weight W, the non-volatile organic liquid is removed from the top plate and the liner. The amount of coating is preferably within the above range. When the coating amount is 5% or more and 10% or less of the weight W, the gas barrier property slightly varies, and when it is 250% or less of the weight W and 200% or more, the liquid oozes on the side of the cap. Some are out. For this reason, more preferably, the coating amount is 10% or more and 200% or less of the weight W.

In the cap of the present invention, the non-volatile organic liquid has a kinematic viscosity of 10 mm ² / s or more at 20 ° C.
Since this cap employs a non-volatile organic liquid having a kinematic viscosity of 10 mm ² / s or more at 20 ° C., it is possible to prevent the non-volatile organic liquid from dripping onto the inner surface of the cap during bottle storage. That is, when the kinematic viscosity is less than 10 mm ² / s, when the non-volatile organic liquid is applied to the inner surface of the cap and the liner is inserted and stored in a horizontal state, the non-volatile organic liquid is present on the inner surface of the cap. There is an inconvenience of dripping down and clogging the mouth of the bottle when capping. Therefore, the kinematic viscosity of the non-volatile organic liquid is preferably not less than the above numerical value.

  The bottle of the present invention is a bottle provided with a cap, wherein the cap is the cap of the present invention. That is, since the bottle with a cap is provided with the cap of the present invention, it has a high gas barrier property and a low opening torque, and has an excellent storage property and a good opening property.

The present invention has the following effects.
That is, according to the cap according to the present invention, since the nonvolatile organic liquid is applied between the top plate portion and the liner, the nonvolatile organic liquid suppresses the intrusion of gas, and high gas barrier properties are obtained. In addition, the opening torque can be reduced by a sliding effect due to the presence of the non-volatile organic liquid. Thereby, even if a liner having a high sealing property is selected, a low opening torque can be obtained, and a cap excellent in the opening property, sealing property, impact resistance and gas barrier property can be obtained at low cost. Therefore, according to the bottle with a cap provided with the cap of the present invention, it is possible to provide excellent openability, hygiene, sealing, and non-migration to contents.

  Hereinafter, an embodiment of a cap 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 fixed to the inner surface of the top plate 2 so as not to drop off are provided. A non-volatile organic liquid L is applied between the top plate 2 and the liner 5.
Moreover, the bottle 6 with a cap of this embodiment is provided with the cap 1 wound around a base part 7.

The cap shell 4 is processed, for example, from a plate material of aluminum or aluminum alloy, and the plate material uses a coated plate in which the inner and outer surfaces are painted (inner surface: size varnish + top coat, outer surface: size coat + gloss varnish). ing. Note that various types of lubricant added are used for the inner surface top coat as required.
The liner 5 is molded from a synthetic resin and gives the cap shell 4 a sealing effect.
The outer diameter of the liner 5 is smaller than the inner diameter of the inner surface of the top plate 2 of the cap shell 4 and depends on the cap diameter and the thickness of the liner 5, but the difference is preferably 0.5 mm or more.

Further, a liner locking projection (not shown) is formed in a portion of the cylindrical peripheral wall portion 3 that is slightly lowered from the top surface, and is formed in a belt shape or a partial protrusion shape on the circumference. The inner diameter of the liner locking projection is set smaller than the outer diameter of the liner 5.
The cylindrical peripheral wall portion 3 of the present embodiment includes a knurl 8, a groove 9, a perforation 10, a bead 11, and a skirt portion 12. In addition, these are provided in the cylindrical surrounding wall part 3 as needed.

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 a pressure block, and in this state, a stepped portion 7a is formed on the shoulder portion of the cap 1 by drawing with the pressure block. . Further, in this state, the screw part 7b is formed by the screw roller, and the skirt part 12 is wound around the turn part 7c of the base part 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 are generally added by post-processing. There is a method in which the liner is pre-molded and a method in which the molten resin is put into the cap shell and simultaneously embossed and cooled to form the liner. In this embodiment, a method of inserting a pre-molded liner is employed.

  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 portion is locked to the turnip portion 7 c of the base portion 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 7c 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.

  The liner material used for the liner 5 is mainly a synthetic resin, and a plasticized vinyl chloride resin, a polyurethane, a polyolefin resin such as polyethylene or polypropylene, a copolymer of polyolefin or a blend of these with an elastomer is used. . When these are used as the liner material, there are a method in which the liner material is molded into a certain shape in advance and a method in which the liner raw material is melted by heating and put into a cap shell and then embossed.

The liner 5 of the present embodiment is used by molding a sheet having a certain thickness as a liner material in advance, punching it into a disk shape, and inserting it into the cap shell 4. Also, the liner 5 may be a liner material molded into a certain shape by injection molding or the like.
The liner 5 is, for example, as shown in FIG. 3A, a hard layer 5a disposed on the top plate portion 2 side and a laminated state on the hard layer 5a on the base portion 7 side, and is more flexible than the hard layer 5a. A multilayer structure sheet having a flexible layer 5b. In the case of this multilayered liner 5, the non-volatile organic liquid L is applied between the top plate 2 and the hard layer 5 a.

  The non-volatile organic liquid L is preferably silicone oil, polybutene, or glycerin, and preferably has a boiling point of 200 ° C. or higher.

Furthermore, the coating amount of the non-volatile organic liquid L is
Arithmetic average roughness on the surface of the top 5 of the liner 5 is Ral (μm),
Ras (μm) is the arithmetic average roughness on the inner surface of the top plate part 2,
When the area on the surface on the top plate 2 side of the liner 5 is S (mm ² ),
W (mg) = 2/3 × 10 ⁻³ S (Ral + Ras) Formula (1)
It is preferably 5% or more and 250% or less of the weight W represented by

  There are several methods for applying the nonvolatile organic liquid L. For example, there is a method in which a predetermined amount is applied to the back side of the synthetic resin liner 5 by spray coating, roller coating, or the like. The coated sheet for the liner 5 is punched out and inserted so that the surface coated with the non-volatile organic liquid L is in contact with the inner surface of the cap shell 4, so that the non-volatile organic liquid is placed between the top plate 2 and the liner 5. L can be applied.

On the contrary, there is a method in which the non-volatile organic liquid L is applied in advance to the inner surface of the cap shell 4 and a disc-shaped liner 5 punched from the sheet is inserted. In this case, it is not necessary to apply the non-volatile organic liquid L to the entire inner surface of the top plate portion 2 of the cap shell 4, and a sufficient effect can be obtained if a certain amount is applied to substantially the center of the inner surface of the top plate portion 2. In order to make this more secure, the circular punch for inserting the liner 5 into the cap shell 4 is pressed so that the liner 5 is completely in contact with the inner surface of the top plate 2 and, if necessary, a slight rotation is applied. It doesn't matter.
Thereby, the non-volatile organic liquid L apply | coated to the inner surface of the top-plate part 2 spreads uniformly by the pressure when contacting the liner 5. FIG. Further, a force is applied to the liner 5 by the internal pressure after filling, etc., and the cap shell 4 and the liner 5 are more closely attached.

As a stamping method, there is a method in which a certain amount of non-volatile organic liquid L is attached to a cylindrical tip such as rubber and stamped on the inner surface of the top plate 2 of the cap shell 4.
Each of these application methods has its characteristics, but in this embodiment, a method of applying a certain amount to the center of the inner surface of the top plate portion 2 of the cap shell 4 is relatively easy to control the application amount.

  It is possible to improve the openability and improve the gas barrier property by applying the non-volatile organic liquid L to the outer surface of the liner 5 (the side opposite to the cap shell 4 side). Since it is considered that the organic liquid L enters the contents of the bottle 6, it is not adopted in this embodiment.

  The appropriate amount of application of the non-volatile organic liquid L depends on the unevenness of the contact surface of the liner 5 with the cap 1, but since the internal pressure is often applied by heat treatment or the like after capping, the unevenness portion of the contact surface is deformed. Set as described above. That is, the allowable amount of the appropriate coating amount is 5% to 250% of the weight W according to the above-described calculation formula (1), more preferably 10% to 200% for the reason described above.

The kinematic viscosity of the nonvolatile organic liquid L is preferably 5 mm ² / s or more at 20 ° C., more preferably 10 mm ² / s or more. When the kinematic viscosity of the non-volatile organic liquid L is less than 10 mm ² / s, when the non-volatile organic liquid L is applied to the inner surface of the cap 1, the liner 5 is inserted and the cap 1 is stored horizontally, the non-volatile organic liquid L When the cap shell 4 hangs down and is capped, the base part 7 becomes dirty.

  When the kinematic viscosity of the non-volatile organic liquid L is higher than the preferable range, the kinematic viscosity may be adjusted using an appropriate solvent such as water in order to obtain appropriate production conditions. In this case, a drying step may be added after the application of the nonvolatile organic liquid L or after the liner 5 is inserted.

  Thus, since the non-volatile organic liquid L is apply | coated between the top-plate part 2 and the liner 5, the non-volatile organic liquid L suppresses the penetration | invasion of gas, and the cap 1 of this embodiment suppresses high gas. A barrier property can be obtained, and the opening torque can be reduced by a sliding effect due to the presence of the non-volatile organic liquid L. In particular, since the liner 5 having a multilayer structure including the hard layer 5a having slidability with the cap shell 4 and the soft layer 5b having sealing property between the cap portion 7 is used, the gas barrier property is ensured. In the state, the sealing performance (sealing performance) and the opening torque (sliding performance) can be further improved. Thus, in this embodiment, since the gas barrier property is high due to the non-volatile organic liquid L, it is possible to select the liner 5 having a high sealing property.

Further, by selecting silicone oil or polybutene as the nonvolatile organic liquid L, the gas barrier property is remarkably improved. When glycerin is selected as the nonvolatile organic liquid L, it has a high gas barrier property, and the kinematic viscosity of the nonvolatile organic liquid L can be easily adjusted by adding water.
Furthermore, since the coating amount of the non-volatile organic liquid L is set within the range of 5% to 250% of the weight W represented by the above formula (1), sufficient gas barrier property and appropriate opening torque Can be obtained.
Moreover, since the non-volatile organic liquid L having a kinematic viscosity of 20 mm or more and 10 mm ² / s or more is employed, it is possible to prevent the non-volatile organic liquid L from dripping onto the inner surface of the cap 1 during bottle storage.

  Thus, according to the bottle 6 with a cap provided with the said cap 1, it has a high gas barrier property and a low opening torque, and can be equipped with the outstanding storage property and favorable opening property.

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.
For example, the liner 5 used in the present embodiment preferably employs a sheet having a multilayer structure as described above, but may be a single layer as shown in FIG. The liner 5 may be foamed or non-foamed.
Further, the shape and size of the liner 5, the shapes of the cap 1 and the bottle 6, the capacity, and the like are appropriately selected.

Next, a cap and a bottle with a cap according to the present invention will be specifically described with reference to practical examples.
<Example 1>
In Example 1 of the present invention, a liner material was formed by laminating a PP sheet serving as a PP layer and a styrene-based elastomer sheet serving as an elastomer layer, and this was punched into a disk shape of 37.0 mm. It was inserted as a liner into a 38 mm PP cap shell. In this case, the thickness of the PP layer was 600 μm, the elastomer layer was 400 μm, and the PP layer was inserted in contact with the cap shell.

The cap shell uses an aluminum sheet that is baked (50mg / dm ² ) with epoxy phenolic paint containing polyethylene lubricant as a top coat on the size coat on the inner surface, punched with a press, and molded into a 38mm PP cap shell did. Silicone oil was used as a non-volatile organic liquid for the cap shell, and a predetermined amount was applied to the center of the inner surface of the cap shell, and a liner punched from the liner material was inserted.

  This cap was capped in an aluminum bottle containing 275 g (total amount 338 ml). The contents used water to which a certain amount of vitamin C was added, and after taking 63 ml of the head space, the head space portion was replaced with nitrogen gas, capped and subjected to a retort treatment at 121 ° C. for 20 minutes. Thereafter, the drop impact test (sealability evaluation), the opening torque, the retention rate of vitamin C (gas barrier evaluation), and the oozing state from the liner of the nonvolatile organic liquid after opening were examined.

As for this liner material, when molding the PP layer of the two-layer sheet, several types of PP layers with different surface roughness of the cooling roller are used, and a sheet having a different PP layer surface roughness is produced as a liner material. I tried it. As the nonvolatile organic liquid, silicone oil (kinematic viscosity 1000 mm ² / s) was used as described above. These evaluation results are shown in Table 1 below. As a comparative example, Table 1 also shows the results of a similar evaluation of an uncoated cap that does not apply a nonvolatile organic liquid.

The liner roughness (Ral) and the cap inner surface roughness (Ras) were measured with an ultra-deep shape measuring microscope KV-8550 manufactured by Keyence Corporation. The unit of arithmetic average-roughness (Ra) is μm.
The above drop impact test evaluates the sealing performance of capping. After capping and heat treatment, it is allowed to stand for 1 day, and then the bottle is inverted and dropped from a height of 30 cm onto an iron plate with a 10 ° angle. The difference in internal pressure before and after the drop was examined, and the number of leaks was investigated. The number of samples is 10 each.

The opening torque was left at room temperature for one week after capping and heat treatment, and then the torque at the start of rotation (first torque) was measured with a torque meter. In addition, it evaluated by the average value of 10 samples.
The vitamin C retention rate is a test for evaluating the gas barrier property by measuring the amount of vitamin C decreased due to invading oxygen (gas), and the measurement is performed by filling a bottle with a 100 ppm vitamin C solution. After capping and heat treatment, the sample was left in a constant temperature room at 40 ° C. for 1 month, and the consumption of vitamin C was measured with an automatic potential titrator.

Whether or not the non-volatile organic liquid oozed out was determined by visual judgment after the cap was opened. The determination was made separately as follows.
◎ = Liquid is in the liner.
○ = Liquid is contained at the edge of the liner.
Δ = Liquid is on the side of the cap.
× = Liquid is coming to the bottle mouth.

  As can be seen from Table 1 above, the examples of the present invention in which silicone oil was applied as a non-volatile organic liquid all had a high vitamin C retention of 80% or more compared to the non-coated comparative example, and had good gas Barrier properties are obtained. In all of the examples of the present invention, the opening torque was as low as less than 120 Ncm, and the drop impact test and the degree of liquid oozing were good results.

In particular, when the application amount of the non-volatile organic liquid is within the range of 5% to 250% of the weight W according to the above formula (1), no leakage is observed in the drop impact test, and the opening torque is even lower at 110 Ncm or less. It was. Furthermore, when the coating amount is 200% or less of the weight W, the degree of liquid oozing is also ◯ or ◎, and thus more excellent evaluation results are obtained.
On the other hand, in the non-coated comparative example, the vitamin C retention is low as less than 70%, the gas barrier property is inferior, the opening torque is as high as 130 Ncm or more, and leakage occurs in the drop impact test. Was.

<Example 2>
In Example 2 of the present invention, a 2.0 mm-thick LDPE sheet foamed approximately twice was used as the liner material. This was punched into a 27.0 mm disk and inserted into a 0.22 mm thick aluminum 28 mm PP cap shell as a liner. In this case, the inner surface of the cap shell was baked (40 mg / dm ² ) and applied with an epoxy phenol paint containing a lubricant. After applying a certain amount of non-volatile organic liquid MTG (triglyceride) to the center of the inner surface of the cap shell, a foamed PE liner was inserted.

This cap was capped in a glass bottle containing 190 g (total amount 210 ml). The contents were filled with 60 ° C. warm water to which a certain amount of vitamin C was added, 20 ml of head space was taken, and after capping and hot water treatment at 70 ° C. for 10 minutes, the same evaluation as in Example 1 was performed. It was. However, the presence or absence of leakage in the drop impact test was examined by changing the degree of vacuum.
For the test liner material, foam sheets with different surface roughness were prepared by extruding the foam sheet from a T die and changing the surface roughness of the cooling roller so that the roller roughness was transferred to the surface of the foam sheet. The evaluation results of Example 2 are shown in Table 2 below. As a comparative example, Table 2 also shows the results of the same evaluation of a non-application cap that does not apply a non-volatile organic liquid.

  As can be seen from Table 2 above, in the same manner as in Example 1, Example 2 using triglyceride as the non-volatile organic liquid has all of the drop impact test, the opening torque, and the vitamin C retention rate as compared with the comparative example. Good results were obtained. In particular, when the application amount of the nonvolatile organic liquid is within the range of 5% or more and 250% or less of the weight W, more excellent evaluation results are obtained for the test items, and the application amount is 200% of the weight W. If it is less than or equal to%, good results of ◯ or ◎ are obtained for the degree of liquid oozing.

<Example 3>
In Example 3 of the present invention, a liner material was prepared by laminating an LDPE sheet to be an LDPE layer and an olefin elastomer sheet to be an elastomer layer. This was punched into a disk shape of 37.0 mm and inserted as a liner into a 38 mm PP cap shell (shell inner diameter 38.15 mm, liner locking portion inner diameter 35.60 mm) having a thickness of 0.24 mm. In this case, the thickness of the LDPE layer was 500 μm, the elastomer layer was 300 μm, and the LDPE layer was inserted in contact with the cap shell. On the inner surface of the cap shell, an epoxy phenol paint containing a fatty acid amide lubricant and baked (50 mg / dm ² ) was applied, and the LDPE layer was molded so as to have certain irregularities. After applying a certain amount of liquid to this LDPE layer, it was inserted into a 38PP cap shell.

  This cap was capped in an aluminum bottle containing 275 g (total amount 338 ml). As the contents, water with a certain amount of vitamin C added was used, and after 63 ml of the head space was taken, the head space portion was replaced with nitrogen gas, capping was performed, and hot water treatment at 70 ° C. for 10 minutes was added. Thereafter, the same evaluation as in Example 1 was performed. In Example 3, liquid paraffin was used as the nonvolatile organic liquid, and a certain amount was applied to the center of the inner surface of the cap shell.

  As for this liner material, when molding the LDPE layer of the two-layer sheet, several types with different surface roughness of the cooling roller were used, and sheets with different surface roughness of the LDPE layer were prepared and used as liner materials. did. The evaluation results of Example 3 are shown in Table 3 below. As a comparative example, Table 3 also shows the results of the same evaluation of an uncoated cap that does not apply a nonvolatile organic liquid.

  As can be seen from the evaluation results of Table 3 above, as in Example 1, Example 3 using liquid paraffin as the non-volatile organic liquid also had a drop impact test, opening torque, and vitamin C retention compared to the comparative example. Good results have been obtained for both rates. In particular, when the coating amount of the non-volatile organic liquid is in the range of 5% to 250% of the weight W, more excellent evaluation results are obtained for the test items, and the coating amount is 200% of the weight W. In the following, good results of ◯ or ◎ are obtained for the degree of liquid oozing.

<Example 4>
In Example 4 of the present example, a liner material was prepared by laminating an LDPE sheet to be an LDPE layer and a styrene elastomer sheet to be an elastomer layer. This was punched into a disk shape of 37.0 mm and inserted as a liner material into a 38 mm PP cap shell (shell inner diameter 38.15 mm) having a thickness of 0.24 mm.

In this case, the thickness of the LDPE layer was 500 μm, the elastomer layer was 400 μm, and the LDPE layer was inserted so as to be in contact with the cap shell. An LDPE layer was molded so as to have a certain unevenness by using an epoxy phenol paint containing a polyethylene lubricant baked (50 mg / dm ² ) applied to the inner surface of the cap shell. And this was inserted in the cap shell.

  This cap was capped in an aluminum bottle containing 275 g (total amount 338 ml). The contents used water with a certain amount of vitamin C added, 63 ml of the head space was taken, the head space portion was replaced with nitrogen gas, capping and hot water sterilization treatment was added at 70 ° C. for 20 minutes. Thereafter, the same evaluation as in Example 1 was performed.

  Polybutene was used as the non-volatile organic liquid, and a constant amount was applied to the center of the inner surface of the cap shell while changing the coating amount. Further, as additional examples, water-soluble non-volatile organic liquid provided as deglycerin laurate and polyglycerin caprylate as polyglycerin fatty acid ester, sorbitan caprylate as sorbitan fatty acid ester, and diglycerin laurate as diglycerin fatty acid ester A certain amount was applied to the center of the inner surface of the cap shell.

  About this liner material, when molding the LDPE layer of a two-layer sheet, several types of liner materials having different surface roughnesses of the LDPE layer were produced using a material having a changed surface roughness of the cooling roller. The evaluation results of Example 4 are shown in Table 4 below. As a comparative example, Table 4 also shows the results of the same evaluation of a non-application cap that does not apply a non-volatile organic liquid.

  As can be seen from Table 4 above, as in Example 1, Example 4 using polybuden as the non-volatile organic liquid also had a drop impact test, opening torque, vitamin C retention, Good results have been obtained for each of the extent of bleeding.

  In Example 4 using decaglycerin laurate, polyglycerin caprylate, sorbitan caprylate, and diglycerin laurate that are water-soluble as the nonvolatile organic liquid, a drop impact test, an opening torque, a vitamin C retention rate, and It has good characteristics in the extent of liquid oozing.

<Example 5>
In Example 5 of the present invention, an LDPE was used to make a plug-type inner plug that fits into a 28 mm diameter PET bottle with an injection molding machine, and inserted as a liner material for a 28 PET bottle resin cap (made of polypropylene). In this case, the inner plug has a substantially flat flange (flange outer diameter 27.0 mm) at the top of the plug, and the flange is formed in a portion near the top surface of the side wall of the resin cap shell. Although it moves freely by the stop projection, it is in a stable locked state.

  This plug is put on a PET bottle and tightened so that the plug portion can be tightly sealed to the inner diameter of the bottle mouth. This cap is a system in which when opening the cap, the cap shell first moves, and then the flange portion of the inner plug is pulled up by the locking portion of the cap shell, and the plug portion comes out of the bottle. Since it is not necessary to apply a rotational force to the inner plug when opening, a low opening torque can be obtained. A fixed amount of non-volatile organic liquid was applied between the top surface of the inner plug and the resin cap shell. A certain amount was applied to the center of the inner surface of the cap shell. Hydrogenated polybutene was used as the nonvolatile organic liquid.

  This cap was capped in a 500 ml glass bottle. The contents were filled with 60 ° C. warm water to which a certain amount of vitamin C was added, capped and subjected to 70 ° C. × 10 min warm water treatment with 20 ml of headspace taken, and then the same as in Example 1 Evaluation was performed. However, the presence or absence of leakage in the drop impact test was examined by changing the degree of vacuum. The evaluation results of Example 5 are shown in Table 5 below.

  As can be seen from Table 5 above, in the same manner as in Example 1, in Example 5 using hydrogenated polybuden, all of the drop impact test, the opening torque, and the vitamin C retention rate are good as compared with the comparative example. The result is obtained. In particular, when the application amount of the nonvolatile organic liquid is within the range of 5% to 250% of the weight W, a better evaluation result can be obtained with the above test items. Good results of ◯ or ◎ are also obtained for the degree of bleeding.

<Example 6>
In Example 6 of the present invention, as in Example 1, a liner material was obtained by bonding a PP sheet and a styrene elastomer sheet. This was punched into a 37.0 mm disk and inserted into a 0.24 mm thick 38 mm PP cap shell as a liner material. In this case, the thickness of the PP layer was 600 μm, the elastomer layer was 400 μm, and the PP layer was inserted in contact with the cap shell.

As the cap shell, an aluminum sheet having an inner surface baked (50 mg / dm ² ) and coated with an epoxy phenolic paint containing a polyethylene lubricant was punched with a press and formed into a 38 mm PP cap shell. Use several types of silicone oils with different kinematic viscosities as non-volatile organic liquids in this cap shell, apply a certain amount to the center of the inner surface of the cap shell, insert the above-mentioned liner material, and insert the liner into the cap shell with a punch. Pressed to do.

This cap was placed horizontally at 30 ° C. for 1 week, and it was examined how much silicone oil dripped on the inner surface of the cap shell. Moreover, the same evaluation as Example 1 was performed using this cap. However, the presence or absence of leaching of the non-volatile organic liquid was determined by visually determining how much liquid gathered on the side of the cap after applying and fitting the liner and then placing it all horizontally. This visual judgment was performed according to the following criteria.
◎ = Liquid is in the liner.
Δ = Liquid is contained at the edge of the liner.
X = Liquid is coming to the side of the cap.
The evaluation results of Example 6 are shown in Table 6 below.

As can be seen from the evaluation results in Table 6 above, as in Example 1, Example 6 using silicone oils having different kinematic viscosities also had a drop impact test, an opening torque, and a vitamin C retention rate compared to the comparative example. In both cases, good results were obtained, and in particular, when the kinematic viscosity was 10 mm ² / s or more, good results were also obtained for the degree of liquid oozing.

<Example 7>
In Example 7 of the present invention, as in Example 1, a liner material was obtained by bonding a PP sheet and a styrene elastomer sheet. This was punched into a 37.0 mm disk and inserted into a 0.24 mm thick 38 mm PP cap shell as a liner material. In this case, the thickness of the PP layer was 600 μm, the elastomer layer was 400 μm, and the PP layer was inserted in contact with the cap shell.

As the cap shell, an aluminum sheet having an inner surface coated with an epoxy phenolic paint containing a polyethylene-based lubricant was baked (50 mg / dm ² ) and punched with a press to be molded into a 38 mm PP cap shell. To this cap shell, glycerin, propylene glycol having different kinematic viscosities and an aqueous solution thereof (mainly viscosity adjustment for stabilizing workability) were applied as a non-volatile organic liquid, and a certain amount was applied to the center of the inner surface of the cap shell. In this case, the application amount was equivalent to the calculated dry weight. And the said liner material was pierced and inserted in this. Evaluation similar to Example 1 was performed using this cap. The evaluation results of Example 7 are shown in Table 7 below.

  As can be seen from Table 7 above, in the same manner as in Example 1, in Example 7 using glycerin and propylene glycol having different kinematic viscosities, compared with the comparative example, the drop impact test, the opening torque, and the vitamin C retention rate. In both cases, good results have been obtained.

In one Embodiment of the cap which concerns on this invention, and a bottle with a cap, it is the side view which fractured | ruptured the 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 principal part sectional drawing which shows the liner of a lamination sheet type and a single layer sheet type.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Cap, 2 ... Top plate part, 3 ... Cylindrical peripheral wall part, 4 ... Cap shell (cap main body) 5 ... Liner, 5a ... Hard layer, 5b ... Soft layer, 7 ... Cap part, 6 ... Bottle with cap, 13 ... Bottle body, L ... Nonvolatile organic liquid

Claims (7)

A cap body made of a metal or a synthetic resin made of a top plate portion and a cylindrical peripheral wall portion hanging from the periphery of the top plate portion;
A plate-shaped synthetic resin liner provided on the inner surface of the top plate portion,
A cap, wherein a non-volatile organic liquid is applied between the top plate portion and the liner. The cap according to claim 1,
The liner has a multilayer structure having at least a hard layer disposed on the top plate portion side and a soft layer laminated on the hard layer and more flexible than the hard layer,
The cap, wherein the non-volatile organic liquid is applied between the top plate portion and the hard layer. The cap according to claim 1 or 2,
The cap, wherein the non-volatile organic liquid is silicone oil or polybutene. The cap according to claim 1 or 2,
The cap, wherein the non-volatile organic liquid is glycerin. The cap according to any one of claims 1 to 4,
The application amount of the nonvolatile organic liquid is
Arithmetic average roughness on the surface of the liner side of the liner is Ral (μm),
The arithmetic mean roughness on the inner surface of the top plate is Ras (μm),
When the area on the surface of the liner on the top plate side is S (mm ² ),
W (mg) = 2/3 × 10 ⁻³ S (Ral + Ras)
5 to 250% of a weight W represented by The cap according to any one of claims 1 to 5,
The kinematic viscosity of the non-volatile organic liquid is 10 mm ² / s or more at 20 ° C. A bottle with a cap,
The said cap is a cap as described in any one of Claim 1 to 6, The bottle with a cap characterized by the above-mentioned.

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