TWI648205B - Resin cap - Google Patents

Abstract

When a container mouth portion made of an uncrystallized resin having a thickness of 2 mm or more at the tip end is used, a resin cap having a good sealing property of the container can be maintained. The resin cover (10) of the present invention includes: a top plate portion (11); a tubular portion (12) that hangs from a periphery of the top plate portion (11); and an outer ring (13) that is formed at the top plate portion (11) The inner surface is in contact with the outer peripheral surface of the container mouth portion (20); and the inner ring (14) is formed on the inner surface of the top plate portion (11) and is in contact with the inner peripheral surface of the container mouth portion (20), The inner peripheral surface of the ring (13) has a shape that forms a peripheral surface along the front end of the container mouth portion (20). The thickness of the front end of the mouth portion (20) of the container is 2 mm or more.

Description

Resin cover

The present invention relates to a detachable resin cover for use in a mouth formed of an uncrystallized resin in a container such as a PET bottle.

The cover made of such a resin is widely used: a top plate portion; a tubular portion that hangs from a peripheral edge of the top plate portion; and an outer ring that is formed on an inner surface of the top plate portion and that is in contact with an outer peripheral surface of the container mouth portion; And an inner ring formed on the inner surface of the top plate portion and in contact with the inner circumferential surface of the mouth portion of the container, and the outer ring and the length (the vertical distance from the top plate portion) are held by the inner ring longer than the outer ring to hold the mouth of the container The container is sealed (the appropriate literature of this prior art is not exemplified).

On the other hand, in the mouth portion of the resin such as a bottle, there are two types of crystallized white type (crystallized container mouth) and uncrystallized transparent type (non-crystalline container mouth). Generally, in order to increase the strength of the resin by thermal crystallization, the mouth of the crystallization vessel is used at a thickness of about 1.6 mm, and the mouth of the amorphous container is lower in strength than the mouth of the crystallization vessel by the strength of the resin. Formed 2mm or more (about The thickness of about 2.2mm) is used to maintain strength.

When the contents of the container having the mouth of the amorphous container are filled at a high temperature and the resin cap is attached, the so-called amorphous container mouth is softened by heat, and the outer ring is not pressed. Since the inside collapses, the sealing property is lowered. Therefore, in the container filled with the high-temperature contents, the mouth of the crystallization vessel having high heat resistance is usually used.

However, since the mouth of the crystallization vessel requires a crystallization step, the cost of equipment becomes high, or the quality management becomes difficult to control the deviation in the crystallization step or the like.

In view of the above-mentioned problems, in recent years, it has been reviewed that the container of the high-temperature-filled contents has a heat-resistant property by thickening the mouth of the amorphous container, but the above-mentioned occurrence occurs in the mouth of the amorphous container. There is no risk of pouring inward, so there is no resin cap that can press the outer ring tightly against the thickened non-crystalline container mouth, and there is still room for improvement in sealing properties.

The present invention has been made in view of the above circumstances, and it is an object of the invention to provide a container mouth portion which is formed by an uncrystallized resin having a thickness of 2 mm or more at the tip end. Resin cap.

As a result of research by the present invention, even if the thickness of the tip end of the container is 2 mm or more, the thickness of the tip end of the container is not easily broken inward due to heat softening, and the cover is closed by heat. The inner surface of the outer ring forms a shape along the outer shape of the mouth of the container, so that the outer ring is in close contact with the outer surface of the mouth of the container, and a new concept of the cover structure capable of improving the sealing property is invented.

In other words, the resin cap of the present invention is characterized in that a container mouth portion made of an uncrystallized resin having a thickness of 2 mm or more at the tip end is provided, and includes a top plate portion and a tubular portion which is from the top plate portion. a peripheral rim; an outer ring formed on an inner surface of the top plate portion and in contact with an outer peripheral surface of the mouth portion of the container; and an inner ring formed on an inner surface of the top plate portion and an inner circumference of the mouth portion of the container The inner peripheral surface of the outer ring is formed in a shape along the outer peripheral surface of the front end of the container mouth portion in surface contact.

According to this configuration, the contact area of the outer ring and the mouth of the container can be increased as compared with the prior art. Therefore, in the case of using the mouth of the container having a thickness of 2 mm or more at the tip end, the sealing property of the container can be maintained good.

According to another aspect of the invention, the resin cover includes a support portion that is formed between the outer ring and the tubular portion on an inner surface of the top plate portion and that is in contact with an outer circumferential surface of the outer ring.

According to this configuration, since the outer ring can be reinforced by the support portion from the direction opposed to the pressure received by the mouth of the container, the deformation to the outer side of the outer ring can be further suppressed.

A further feature of the present invention resides in the aforementioned support The portion is formed between the outer ring and the tubular portion.

According to this configuration, the reinforcing effect of the outer ring generated by the support portion can be improved.

According to a further feature of the present invention, the support portion is configured by a plurality of ribs arranged at substantially equal intervals along a circumferential direction of the outer ring.

According to this configuration, the weight of the resin cover is not greatly increased, and the reinforcing effect of the outer ring generated by the support portion can be improved.

10‧‧‧Resin cover

11‧‧‧ top board

12‧‧‧ Tube

12a‧‧‧ threaded teeth

13‧‧‧Outer Ring

14‧‧‧ Inner Ring

15‧‧‧Support

16‧‧‧ ribs

20‧‧‧ Container mouth

20a‧‧‧ threaded teeth

Fig. 1 is a cross-sectional view showing a state in which a resin cap of the present invention is attached to a mouth of a container.

Fig. 2 is an enlarged view of an important part in Fig. 1.

Fig. 3 is a perspective view showing the inside of a resin cover of the present invention.

Fig. 4 is a cross-sectional view taken along line IV-IV in Fig. 1.

The resin cap of the present invention will be described below with reference to the drawings.

[Embodiment 1]

As shown in Fig. 1, the resin cap 10 of the present embodiment is used in a container mouth portion 20 made of a resin which is not crystallized in a container.

As shown in FIGS. 1 and 2, the resin cover 10 of the present embodiment includes a top plate portion 11, a cylindrical portion 12 which is suspended from the periphery of the top plate portion 11, and an outer ring 13 which is formed in the top plate portion. The inner surface of the outer surface of the outer peripheral surface 13 is formed on the inner surface of the top plate portion 11 and is in contact with the inner circumferential surface of the container mouth portion 20, and the inner circumferential surface of the outer ring 13 is formed. The shape along the outer peripheral surface of the front end of the container mouth portion 20 (substantially parallel to the outer peripheral surface of the front end of the container mouth portion 20) is formed.

The resin cover 10 is not particularly limited to a material, a method, or the like. For example, the top plate portion 11, the tubular portion 12, the outer ring 13, and the inner ring 14 may be integrally molded by injection molding using a resin such as polyethylene or polystyrene. Manufacturing.

The top plate portion 11 of the resin cap 10 is formed into a disk shape in accordance with the shape of the container mouth portion 20, and the screw 12a is provided on the inner circumferential surface of the tubular portion 12, and the snail formed on the outer circumferential surface of the container mouth portion 20 The tooth 20a is screwed, and the resin cover 10 is attached to the container mouth 20.

The outer ring 13 and the inner ring 14 have a shape that protrudes from the inner surface of the top plate portion 11. The inner peripheral surface of the outer ring 13 is brought into contact with the outer peripheral surface of the container mouth portion 20, and the outer peripheral surface of the inner ring 14 comes into contact with the inner peripheral surface of the container mouth portion 20 to seal the container.

As shown in FIGS. 1 and 2, the outer ring 13 has a shape in which the inner peripheral surface is formed along the outer peripheral surface of the front end of the container mouth portion 20. Therefore, when the contents of the high temperature are filled in the container, the container mouth portion 20 is deeply inserted into the resin cap 10 as shown in Fig. 1 and Fig. 2, and the high temperature sterilization is performed even in the state. Can also suppress the capacity The inward rotation of the mouth portion 20 and the deformation of the outer side of the outer ring 13 maintain the state in which the outer ring 13 and the outer peripheral surface of the container mouth portion 20 are in close contact with each other.

Further, when the resin cap 10 is attached to the container mouth portion 20, the distal end of the outer ring 13 is located on the distal end side of the container mouth portion 20 than the thread 20a. The length from the inner surface of the top plate portion 11 of the outer ring 13 is not particularly limited, and may be set to be the same length as the conventional resin cover. However, for example, the resin can be made into the cover 10 and the mouth of the container by being formed long. The tightness of 20 is improved.

On the inner surface of the top plate portion 11, a support portion 15 is formed on the outer ring 13, and the support portion 15 is interposed between the outer ring 13 and the tubular portion 12. In other words, since the support portion 15 is formed in contact with the outer peripheral surface of the outer ring 13 and the inner peripheral surface of the tubular portion 12, the outer ring 13 is reinforced and the deformation toward the outer side of the outer ring 13 is further suppressed.

As shown in FIG. 3 and FIG. 4, the support portion 15 is configured to have twelve ribs 16 arranged at equal intervals along the outer circumferential surface of the outer ring 13 in the present embodiment. Therefore, the reinforcing effect of the outer ring 13 generated by the support portion 15 can be improved without greatly increasing the weight of the resin cover 10.

The ribs 16 are arranged in the same direction obliquely with respect to the radial direction of the outer ring 13. Therefore, although the reinforcing effect of the outer ring 13 by the rib 16 is improved, the rib 16 can be prevented from excessively pressing the outer ring 13, and the outer ring 13 can be prevented from being damaged and the tubular portion 12 can be deformed.

Further, the height of the support portion 15 (rib 16) is preferably the height of the outer ring 13 from the viewpoint of ensuring a sufficient reinforcing effect. More than 50%, more preferably 70% or more. The upper limit of the height of the support portion 15 (ribs 16) is not particularly limited in the range in which the thread 20a of the container mouth portion 20 and the thread 12a of the tubular portion 12 do not interfere with each other, but the reinforcing effect and cost are considered. The balance of the weight is preferably 100% or less of the outer ring 13.

In the present embodiment, as shown in FIG. 1 and FIG. 2, a part of the outer peripheral surface is abutted against the inner peripheral surface of the container mouth portion 20, but if it is a container The shape in which the mouth portion 20 is in contact with each other is not particularly limited, and various shapes can be employed in addition to the shapes shown in Figs. 1 and 2 .

In the present embodiment, the container mouth portion 20 is of a transparent type which is not crystallized, and the thickness of the tip end thereof is set to 2.2 mm. The upper limit of the thickness of the front end of the mouth portion 20 of the container is not particularly limited, and may be about 3 to 4 mm.

The container having the container mouth portion 20 is not particularly limited as long as the thickness of the tip end of the container mouth portion 20 is 2 mm or more. For example, it can be applied to a synthetic resin such as polyethylene terephthalate. The manufactured beverage is used in a resin container. In particular, it is suitable for use in a resin container in which a content is filled in a high temperature state in a fruit juice beverage, a sports drink, a tea, or the like.

[Other Embodiments]

In the above embodiment, the case where the twelve ribs 16 are provided and arranged at equal intervals is exemplified, but the number of the ribs 16 is not limited thereto, and an arbitrary number of ribs 16 may be disposed. If you consider the reinforcement effect and cost and weight The balance of the ribs 16 is preferably 6 to 24. Further, if the ribs 16 are substantially equally spaced, it is not necessary to arrange them completely at equal intervals, and some of them may be unevenly spaced.

In the above embodiment, the shape of the rib 16 is exemplified between the outer ring 13 and the tubular portion 12, but the shape of the rib 16 is not limited thereto. For example, if it is in contact with the outer peripheral surface of the outer ring 13, the outer ring 13 can be reinforced even if it is separated from the inner peripheral surface of the tubular portion 12. Further, in the present embodiment, the rib 16 is provided substantially in parallel with the top plate portion 11, but for example, a shape in which the distance from the top plate portion 11 is shorter as it goes away from the outer ring 13 can be formed.

In the above-described embodiment, the case where the ribs 16 are arranged obliquely in the same direction with respect to the radial direction of the outer ring 13 is exemplified. However, the ribs 16 are not limited thereto, and for example, the ribs 16 may be disposed in the radial direction to The adjacent ribs 16 are disposed obliquely to each other in different directions.

In the above embodiment, the case where twelve ribs 16 having the same shape are disposed is exemplified, but the present invention is not limited thereto. For example, a plurality of ribs 16 of different shapes may be arranged, or the ribs 16 of the two types of shapes may be alternately arranged, and may be arbitrarily set.

In the above embodiment, the case where the support portion 15 is configured as a plurality of ribs 16 is exemplified, but the present invention is not limited thereto. For example, the support portion 15 may be constituted by an annular member along the outer circumference of the outer ring 13.

Claims (3)

A resin cover using a container mouth portion formed of an uncrystallized resin having a thickness of 2 mm or more at the tip end, and a top plate portion; a tubular portion that hangs from a periphery of the top plate portion; a ring formed on an inner surface of the top plate portion and in contact with an outer peripheral surface of the mouth portion of the container; and an inner ring formed on the inner surface of the top plate portion and in contact with an inner peripheral surface of the mouth portion of the container The cover is characterized in that the inner circumferential surface of the outer ring has a shape along the outer circumferential surface of the front end of the container mouth portion, and includes a support portion formed on the outer surface of the inner surface of the top plate portion and The cylindrical portions are in contact with each other at the outer peripheral surface of the outer ring. The resin cover according to the first aspect of the invention, wherein the support portion is formed between the outer ring and the tubular portion. The resin cover according to the first or second aspect of the invention, wherein the support portion is formed by a plurality of ribs arranged at substantially equal intervals along a circumferential direction of the outer ring.