JPS58216523A - Seal sealing method for preventing defectiveness of vessel made of synthetic resin - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a tamper-evident seal which is made of a synthetic resin and is filled with VC and is made on a button to prevent leakage and contamination of the contents of cosmetics, medicines, foods, etc. The present invention relates to a layer resistance method.

Generally, tamper-evident seals on containers are used to prevent leakage and contamination of the contents, or to indicate to consumers, etc., that the product is in its unopened state based on the Food Sanitation Law and Pharmaceutical Affairs Law. It must be easily removable by consumers when opening the package, and must not easily peel off when the cap is closed or during transportation. However, containers with seals are still currently used for only a very limited number of products, and one of the major reasons for preventing their widespread use is that the process of attaching the seals is difficult, and illegal handling of synthetic resin containers is difficult. The heat-sealing method using a heat press is generally well known as a method of sealing a preventive seal.This heat-sealing method involves placing a tamper-evident seal made of synthetic resin over the spout of the container body. Place a hot plate in pressure contact with the surface of the tamper-proof seal, conduct heat through the tamper-proof seal, heat the top end of the spout of the container body that is in contact with the back side of the tamper-proof seal to near its softening point, and remove the tamper-proof seal. It is to be welded with.

The requirements for anti-tampering stickers are the two requirements mentioned above.If the adhesive strength of the sticker is too strong, it will be difficult to peel it off with your fingertips, and the sticker will sometimes break off from the middle. The result is that.

On the other hand, if it is too weak, it will peel off when the cap is removed, and it will no longer function as a tamper-proofing seal. Therefore, the adhesive strength of the tamper-evident seal must be uniformly and stably maintained so that it can be easily peeled off when the seal is opened, and that it cannot be easily peeled off when the cap is removed.

When considering this requirement for the conventional heat sealing method mentioned above, the material of the tamper-evident seal is synthetic resin;
Thermal conductivity is poor, and when processed into a sheet, the wall thickness usually varies by around 10% to 20%, resulting in slight differences in welding temperature. Therefore, it is necessary to make the adhesive strength of the seal uniform and stable. was equivalent to a very difficult situation.

As a means of uniformly stabilizing the strength of the welding with the container, there are many synthetic resin containers for foods and the like that use a tamper-evident seal coated with a heat-sensitive adhesive or the like on the back side of aluminum foil.

This type of anti-tampering sticker is mainly made of aluminum foil with good thermal conductivity, and is coated with a heat-sensitive adhesive. The strength is uniform and stable.

However, among synthetic resin containers, the contents of tube containers (d1) are limited to those having a liquid or cream-like viscosity, and the contents of the container are dispensed by pressing the body of the container with finger pressure. Moreover, when cosmetics are filled, the cosmetics are mixed with various chemicals that have an active effect on bare skin, and the heat-sensitive adhesive mentioned above may dissolve, causing the tamper-evident seal to peel off or altering the contents. However, there is a problem in that it is often used as tamper-evident seals for cosmetic containers, etc.

Another problem with the above heat sealing method is that the container pouring spout is generally in the form of a narrow tube, and pressing a hot plate against the top end of the spout is inefficient, and the sealing process is difficult. The production process was reduced to '4i because the work of covering the cap was added later.
It covered a wide variety of problems in production technology and production management.

This invention was made in view of the problems mentioned above.
The purpose is synthesis! #1 Method for sealing tamper-evident seals on fat containers; 7. As a tamper-evident sealing material, a laminated structure consisting of a synthetic resin sheet pasted onto metal foil is used, and this tamper-evident seal is attached to the container. After being separably attached to a cap, the cap is attached to a container filled with contents, and high-frequency induction heating is applied from the outside of the cap.The metal foil is heated and the synthetic resin sheet is heated. By adopting the structure of welded wood, it is possible to maintain the adhesive strength required for tamper-evident seals uniformly and without causing deterioration due to chemical changes in the contents of the container, without increasing the cost of the container. There are several companies that provide a sealing method that can be stably maintained without any difficulty in production technology or complexity in production management.

A preferred embodiment of the present invention will be described below with reference to one drawing. FIG. 1 is a partially sectional exploded perspective view illustrating a container and the like used in carrying out the present invention, and details of the tamper-evident seal are shown in a plan view and an enlarged sectional view.

In this embodiment, a container main body 1 made of synthetic resin has a container closing part 2 and a container neck part 3 integrally formed at its upper part, and the outer periphery of the container neck part 3 is engaged with a cap to be described later. A male thread 4 for closing the main body 1 is provided around the periphery, and a spout 5 for dispensing the contents is formed in the upper part of the container neck 3 in the shape of a tapered seam.

The tamper-proofing seal 6 that seals the spout 5 is
It is expressed as a planar circular shape, and there are ears 6 on the periphery at intervals of approximately 120 degrees.
1.611, 6''' are integrally molded, and the cross-sectional form is a synthetic resin sheet (6aii) that is compatible with the olefin resin forming the container body 1 at the bottom layer.
is arranged and adhered to a metal foil 6C made of aluminum or the like by an adhesive layer 6b, and above the metal foil 6C is a adhesive made of a heat-resistant thermosetting epoxy resin!
! A film layer 6d is formed to have a laminated structure consisting of four layers.

The purpose of forming the seal into such a shape is to make it easier to pierce the tamper-evident seal 6 and to ensure that it is locked into the cap as will be described later.

The cap 7 that engages with the male screw 4 provided around the neck 3 of the container body l is formed in a flat cylindrical shape, and has an annular inner wall 9 projecting downward from the ceiling wall of the outer wall 8. A spiral female thread 1O is provided inside the inner wall 9 on the inner tip side thereof, and the inner wall 9 has a thick wall on the ceiling wall side of the outer wall 8. A male screw 11 having a smaller diameter than the female screw 10 is inserted inwardly so that the ears 61, 61°6'11 of the tamper-evident seal 6 can be locked.

Next, the tamper-proof seal sealing method according to the present invention will be explained using the above-mentioned members.

First, the tamper-proofing seal 6 is installed inside the cap 7. As an attachment method, for example, as shown in FIG.
After exhausting the air through the vacuum hole 13 drilled in the center of the cap 2, the tamper-proofing seal 6 is adsorbed and held by the insertion jig 12, and inserted into the inner wall 9 of the cap 7 from the direction of the arrow. and press it against the ceiling wall of the outer wall 8. In this case, the ears 61, 6N of the anti-tamper seal 6.

The diameter including 61″ is smaller than the female thread 10,
Since it is formed to have a slightly larger diameter than the small-diameter male screw 11, the ear portion 61, 6111°6m of the tamper-evident seal 6
As shown in FIG. 2 (11), the tip of the camp 7 is bent into an arched shape and is locked with a small-diameter male screw IIK, so that it will not come off even when the camp 7 is erected.

In this state, the insertion jig 12 is removed and the cap 7 is attached to the container main body IV filled with the contents.
Since it does not exist within 0, it will not affect the lidding operation in any way, and when the cap 7 is attached to the container neck 3, the tip of the spout 5 and the tamper-evident seal 6 will be removed. What is
It is tightly sealed with appropriate pressure and the contents will not leak even if the container is turned upside down.

After this, cap the container, put 7 on the lower side KL,
Place it on the belt conveyor 14 as shown in iii.
Coil 1 of the high frequency heating device is placed below the belt conveyor 14.
5 is installed and high-frequency power is supplied, an eddy current is induced in the metal foil 6C of the tamper-evident seal 6 in the cap on the belt conveyor according to the law of electromagnetic induction, and the heat generation effect of this eddy current causes the metal foil to 60Vr - The attached synthetic resin sheet 6a is melted and welded to the tip of the spout 5,
The tamper-proofing seal 6 is sealed instantaneously, and the state after sealing is shown in a perspective view in FIG. 2, 6V).

When welding the tamper-proof seal 6, in this embodiment, since the tamper-proof seal 6 has a four-layer structure as described above, the tamper-proof seal 6 is connected to the ceiling wall of the outer wall 8 of the cap 7. Thermosetting protective film layer 6 between metal foils 60
Because of the presence of d, even if the metal foil 6C is heated fl, the ceiling wall of the outer wall 8 and the tamper-evident seal 6 will not be welded, and the cap 7 can be removed smoothly. Therefore, if the cap 7 is made of thermosetting resin, it is possible to remove the protective film layer 6d of the tamper-proofing seal 6 to form a three-layer structure. Nor.

Furthermore, when the synthetic resin sheet 6a of the tamper-evident seal 6 is heat-welded, it undergoes secondary contraction after first melting, and due to this shrinkage force, the tamper-evident seal 6 is Bend the peripheral edge toward the spout 5 side. (For this reason, the engaged state of the ears 6', 6'', and 6'' of the tamper-evident seal 6 is released, and the peeling of the tamper-evident seal 6, which is a concern when removing the cap 7, 6', 6°°, 6°
There is no damage to the appearance due to the curling of the cap 7, and the cap 7 can be attached and detached extremely smoothly.

Furthermore, in the sealing method according to the present invention, the heating medium is the tamper-evident seal 6 itself, and there is a danger that a temperature difference will occur on the adhesive surface due to easy conduction. The pressure applied to the tip of the container spout 5 is determined by the torque strength of the tightening of the cap 7 that screws the cap 7 and the container neck 3 together, so that the seal is always stable and the adhesive strength is incorrect. The requirements required for a preventive seal are extremely stably maintained.

In FIG. 3, the tamper-proofing seal 6 is used as a cap, and the small-diameter male screw IIK barb protrusion 16 forming the spiral shape is provided inside as a locking means.

As described above, the method for sealing a tamper-evident seal on a synthetic resin container according to the present invention is to form a tamper-evident seal by pasting a synthetic resin sheet onto metal foil to form a laminated structure, and to place the tamper-preventing seal inside the cap. After attaching the seal in a separable manner, filling the container body with the contents and closing the container spout with the cap, 1. high frequency heating is applied from the outside of the cap to seal the tamper-proof seal inside the cap. The metal foil is heated by induction and the synthetic resin sheet is thermally welded to the tip of the spout to form a tamper-proof seal for the synthetic resin container. There is no variation in the adhesive strength of the tamper-evident seal due to poor quality, and a seal with the appropriate adhesive strength required for a tamper-evident seal can be uniformly and stably provided, and the tamper-evident seal is welded. Unlike the method of putting the cap on later, this method involves installing a tamper-evident sealing material inside the cap beforehand to perform the sealing process.Furthermore, the sealing process can be performed continuously by placing the container on a conveyor belt. It is also an extremely economical sealing method.

[Brief explanation of the drawing]

Figure 1 shows the main parts used to carry out the invention, and the work is carried out in sequence. Figures 2 and 2 are perspective views showing the state after sealing. Figure 3 is a , is a cross-sectional view showing another locking means of the tamper-evident seal. ......Container neck 4...Male thread 5...Spout spout 6...Tamper prevention seal 6°, 6 ″、6
Ear portion 6a...Synthetic resin sheet 6b...Adhesive 6c...Metal foil 6d...Protective film layer 7...・Group/Cap 8...Outer wall 9...Inner wall 10...Female thread 11...Small diameter Male thread 12...Insertion jig 14...Belt conveyor 15...Coil■...Convex protrusion Patented Applicant Yoshida Kogyo Co., Ltd. Agent Patent Attorney - Kensuke Iro 2nd (Iij) Figure 3

Claims (3)

[Claims] (1) In a synthetic resin container in which the contents spout formed in the neck of the container body is sealed with a tamper-proof seal and a cap is attached to the neck, the nuclear tamper-proof seal is synthesized with metal foil. It has a laminated structure with a resin sheet pasted on it, and after the tamper-evident seal is separably attached inside the cap,
After filling the container body with the contents and closing the spout with the cap, the metal foil of the tamper-proof seal inside the cap is heated from the outside of the cap by a high-frequency heating device. A method for sealing a synthetic resin container to prevent tampering, the method comprising heating by induction and thermally welding the synthetic resin sheet to the tip of the spout. (2) Insert a male screw into the cap, form a plurality of protruding ears on the circular periphery of the tamper-evident seal, and push the tamper-evident seal from above into the cap to lock and mount it. A method for sealing a synthetic resin container to prevent tampering as claimed in claim 1. (3) A convex protrusion is placed inside the cap, and the tamper-proofing seal is pushed in from the upper part of the inside of the cap and fixedly attached inside the cap. A method for sealing synthetic resin containers to prevent tampering.