JPS61272131A - Manufacture of container and production unit thereof - Google Patents

Abstract

PURPOSE:To contrive to streamline the heat bonding between a container and a container cover and the formation of a score line for opening seal by a method wherein the thermally adherent resin layer applied onto the inner surface of the metal foil of a container cover is melted and at the same time the thermoplastic resin layer applied onto the outer surface of the metal foil is softened and removed. CONSTITUTION:Firstly, the peripheral wall part 10 of a container cover 2 consisting of a metal foil 6, the outer surface of which is covered with thermoplastic resin layer 7 and the inner surface of which is covered with thermally adherent resin layer 8, is fitted onto the opening part 3, onto which a reinforcing member 24 is coveringly bonded, of a container main body 1 against the holding part 14 of a lifter 11. Secondly, a tapered spindle 17 is lowered so as to insert the container cover 2 onto the container main body 1 by means of a cover-pressing mold 20. Thirdly, the metal foil 6 is heated by flowing electric current through a high frequency coil 15. Fourthly, by raising the spindle 17, the outer surface of the opening part 3 and the inner surface of the peripheral wall part 10 of the container cover 2 are bonded together through the adherent resin layer 8. At the same time, a projecting stripe 23, which is provided on the inner wall 19 of the pressing mold 20 is pressed into a softened thermoplastic resin layer 7 on the peripheral wall part 10 of the container cover 2 so as to remove only the thermoplastic resin layer 7 in order to form a score line 22.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a container lid fitted over an opening of a container body. !
! The present invention relates to a method of manufacturing a container with a score line for opening on the wall and an apparatus for manufacturing the same.

(Prior Art) Conventionally, gold Jl! is used for this type of container. Regarding container lids, it is known that a score line for opening is provided all around the upper edge of the peripheral wall of the container lid, and this score line is provided in a row to the lower edge of the entire circumferential wall of the tab to be broken. ing. However, for such metal container lids, it is important to carve score lines at a predetermined depth on the container lid, which makes quality control quite difficult. Furthermore, in order to prevent the container lid from breaking due to vibration or impact during transportation, thick container lids must be used, which increases the weight of the container as a whole, increases costs, and makes it difficult to incinerate. There are other problems.

Therefore, in order to improve the above-mentioned problems, the present applicant previously proposed in Utility Application No. 60-2864 that a score line was formed by eliminating only the thermoplastic resin layer coated on the outer surface of the metal foil of the peripheral wall. We proposed a nine easy-to-open container using a container lid.

However, in the container, in order to form score lines on the thermoplastic resin layer coated on the outer surface of the metal foil on the peripheral wall of the container lid, score lines are formed by pressing a knife against the resin layer. The heating bonding of the outer surface of the opening of the body and the inner surface of the peripheral wall of the container lid, and the formation of the score line of the peripheral wall of the container lid, must be performed separately, making the work complicated and reducing efficiency. .

When forming a score line by pressing a hot knife against the thermoplastic resin layer on the peripheral wall of the container lid, the hot knife is repelled by the elasticity of the thermoplastic resin layer and only the thermoplastic resin layer is pushed to a predetermined depth. In some cases, the thermoplastic resin layer cannot be melted and removed, and the thermoplastic resin layer remains on the metal foil, making it impossible to obtain smooth opening properties.

Furthermore, when attempting to melt and remove the thermoplastic resin layer without leaving a thermoplastic resin layer on the metal foil, the metal foil may be damaged, and there is a problem in that the foil may be accidentally broken due to impact during transportation. (Problems to be Solved) The present invention solves the conventional problem of M by heat bonding the opening of the container body and the peripheral wall of the container lid, and by heat-bonding the entire peripheral wall of the container lid with the metal foil. The present invention aims to provide a method and equipment for efficiently forming score lines having stable aperture on a plastic resin film.

(Means for Solving the Problems) The present invention has been made to solve the above-mentioned problems, and the first invention is a method for manufacturing a container, in which the outer surface of the opening of the container body and the metal foil are The outer surface of the container lid is coated with a thermoplastic resin layer and the inner surface is coated with a thermoadhesive resin layer, and the inner surface of the peripheral wall of the container lid is adhered to the outer surface of the peripheral wall of the container lid, and an opening score is attached to the thermoplastic resin layer on the outer surface of the peripheral wall of the container lid. In the method of manufacturing a container by forming a wire, the inner surfaces of eight walls of the container lid are fitted to the outer surface of the opening of the container body, and the metal foil on the peripheral wall of the container lid is heated for 7JO using high-frequency induction heating means. The heat-adhesive resin layer on the inner surface of the metal foil is melted to adhere the outer surface of the opening of the container body and the inner surface of the peripheral wall of the container lid, and the heated metal foil is The thermoplastic resin layer on the outer surface of the metal foil is softened, and only this thermoplastic resin layer is removed by the score line forming protrusions to form the opening gamma ray mold bottom.

The second invention is an apparatus used for manufacturing the container of the first invention,
A lifter that can be raised and lowered and is equipped with a holding part that holds the container body, which has a thermoplastic resin layer on the outer surface of the metal foil and a thermoadhesive resin N on the inner surface, and which fits the peripheral wall of the container lid into the opening. , a high-frequency coil is used to heat the metal foil of the container lid that is fitted onto the container body held by the above-mentioned 7-tar, and the heated metal foil melts the heat-adhesive resin layer on the inner surface of the container;
It is equipped with a high-frequency induction heating device that completely softens the thermoplastic resin layer on the outer surface, and a lid compression mold group that is divided into multiple parts and arranged in the raised position of the lifter so that the diameter can be reduced. At the same time, the peripheral wall of the container lid fitted onto the container main body held by the lifter is pressed against the container main body, and the peripheral wall of the container lid is attached to the outer surface of the opening of the container main body by the heat-adhesive resin layer melted by the heating device. a lid crimping device that press-fits a score line forming protrusion provided on the inner wall of the lid crimping mold group and having an acute-angled tip into the thermoplastic resin layer heated and softened by the heating device; The entire characteristic is that it consists of:

(Example) The present invention will be explained below with reference to the drawings.

Container body (1) used for first implementing the present invention
, the container lid (2) will be explained.

A thermoadhesive resin coating (5) such as polyolefin resin is applied to the inner and outer surfaces of the container body (υ is a cylindrical body (4) made entirely of paper with an opening (3) as shown in Figure 5). It is what was done.

Also, the container lid (2) is nine-free as shown in Figure 5.
Made from metal foil (6) such as steel', aluminum, etc.
Its outer surface is made of polypropylene, for example.

Covered with a thermoplastic resin layer (7) such as polyethylene,
Also, its inner surface is made of polyolefin, for example.

Heat-adhesive resin layer (8
) is coated with a positive-shaped peripheral wall part (Ql) in a hanging shape around the entire periphery of the panel part (9) of the container lid (2).

Figures 1 to 3 show an example of the manufacturing equipment used in carrying out the manufacturing method of the present invention. , (13 is a lid crimping device.

The lifter αυ is a device that can be raised and lowered to hold the container body, and as shown in FIG.
Container body (1) fitted with the surrounding wall part of the K container lid (2)
body (1) with a shape corresponding to the inner surface shape of 4J
) is provided.

The high-frequency induction heating device α2 generates magnetic lines of force in a certain direction by flowing a stain current through a power supply unit incorporating a DC reactor, a directional capacitor, etc., and uses the generated magnetic lines of force to connect the metal foil (6) of the container lid (2). ) and mI? ! &
The heat-adhesive resin layer (8) on its inner surface is covered with metal foil (6).
This device is equipped with a high-frequency coil α5 that melts the thermoplastic resin layer (7) on the outer surface of the thermoplastic resin layer (7). Then, the high frequency coil αFJt - the container body held by the lifter αυ + the container M t21 fitted onto the opening (3) of the IJ
An annular girder is provided at a predetermined distance from the container lid (2) on the outside of the container lid (2).

The lid crimping enclosure has an inclined surface αet extending from the bottom to the top on the outer periphery of the side part that rises and falls according to the rise and fall of the lifter fill.
The tapered spindle αη has a shape corresponding to the inclined surface on the tapered spindle side, and has a sliding surface (181t-) that slides along this inclined surface (L61), and has an outer surface of the container lid (2). Inner wall α3t with a shape corresponding to the shape
- A plurality of divided lid crimping molds and a lid pressure M
Bind the entire outer circumference of the mold holder group, and press the sliding surface ag/ of each lid crimping board ■ onto the inclined surface αe of the tapered spindle so that each lid crimping board ■ is always adjacent to each other in a reduced diameter state. The tapered spindle (L7) rises and the sliding surface of each lid crimping type holder (L& is the inclined surface of the tapered spindle (L?), When moving inward along σQ, that is, at a position where the lid crimping plate group is reduced in diameter, the outer W4 wall αQ of the container lid (2) fitted onto the container body (1) held by the lifter (111) As a means for forming a score line (sha), a score line forming protrusion (23t) having an acute-angled tip was provided on the inner wall of each lid crimping plate (a).

Furthermore, a lid crimping type group (2) consisting of a plurality of lid crimping disks (A) was arranged in parallel in the circumferential direction on the outer periphery of the inclined surface αQ of the tapered spindle αD as shown in the second figure. In addition, when the cover crimping plate 1121 group beam lid ■ is in the upward state, it moves relatively to the lower side of the tapered spindle αη, and as shown in the second figure, each lid crimping plate (A) moves on the inclined surface of the tapered spindle αη. When the lifter (11) is lowered, it moves relatively to the upper side of the tapered spindle η, and as shown in the third figure, the inclined surface αQ of the tapered spindle αη.
At the top, each lid crimping plate spreads apart.

Next, the operation of the manufacturing apparatus of the present invention will be explained.
As shown in the figure, a reinforcing member (c) with a roughly n-shaped cross section is covered and bonded in advance to the holding part I of the lifter αυ, and a metal foil (6) is attached to the opening (3) of the container body (1) as shown in the fifth figure. A thermoplastic resin layer (7) is placed on the outer surface of the housing, and a thermal adhesive resin layer (7) is placed on the inside surface of
The container lid (210) covered with the container lid (210) (1G) is fitted onto the body (4) of the container M (11) to be held.

Next, as shown in the fourth diagram, the tapered spindle (I7) is lowered, and each lid crimping plate (■) of the lid crimping car a3 is maintained in an expanded state on the inclined surface (L6) of the tapered spindle αη, resulting in nine lid crimping plates @ The container body (1) held by the lifter I with the lifter ui raised into the gap (c) surrounded by W (In) in the group, and the container lid [2] fitted onto the container body (1)
) is inserted into the high-frequency coil (19) of the high-frequency induction heating device f12 to generate lines of magnetic force in a certain direction. Metal foil (6
), and use this heated metal foil (6) to make Kintsugi foil (6).
) while melting the thermally adhesive resin layer (8) on the inner surface of the
The thermoplastic resin layer (7) on the outer surface of the metal foil (6) is softened.

Next, as shown in Fig. 6, by raising the tapered spindle (17), each lid crimping mold ■ is pressed against the spring Qυ
The elastic force causes the tapered spindle α to contract in diameter on the inclined surface ae, and the inner wall σ9 of each lid crimping plate ■ is reduced in diameter.
is brought into pressure contact from the outside with the container lid (2) fitted onto the container body (11) held by the lifter ■, so that the outer surface of the opening (3) of the container body (1) and the peripheral wall αQ of the container lid (2) The melted adhesive resin N(8) on the inner surface is bonded, and the softened thermoreplastic resin JfI(
A score line forming protrusion @ provided on the inner wall H of each lid pressure bonding board I2a is press-fitted into the sword, and only the thermoplastic resin layer (7) is removed to form a score line (221t-).

Then, the container lid (2) is adhered to the opening (3) of the container body (1), and after forming two score lines on the peripheral wall C1G of the container lid (2), the lid crimping vehicle 1li (131
Tapered spindle α′? ) When it is fully lowered, each lid crimping plate (20 is expanded on the tapered spindle (one slope α6) Release 0 and lifter 01) and lower it completely to remove the container body (1) and the container lid (2).
), the outer surface of the opening (3) of the container body (1) and the inner surface of the peripheral wall αQ of the container lid (2) are bonded together as shown in FIG. A container with an opening score line (■) formed by excluding only the thermoplastic resin layer (7) on the outer surface of σα is obtained.

As mentioned above, in order to bond the container body (11) and the container lid (2) and to form the score line (2) on the container lid (2), the high-frequency induction heating device (13) and the score line forming protrusion (C) are used. CI3, a vehicle equipped with a lid crimping pad that expands and contracts in diameter.
and use.

When heating, use high-frequency induction heating device α2 to close the container lid (2).
The metal foil (6) is completely heated, and this heated metal foil (6)
The thermoadhesive resin layer (8) on the inner surface is melted, and the thermoplastic resin layer (7) on the outer surface is softened. Therefore, since the heat-adhesive resin layer (8) on the inner surface of the metal foil (6) of the container lid (2) is melted, the lid crimping plate (a) group of the lid crimping vehicle αy is pressed onto the container lid (2). The opening (3) of the container body (11), the container lid (2), and the peripheral wall αα can be reliably and easily bonded together simply by 2)
Since the thermoplastic resin layer (7) on the outer surface of the metal foil (6) has been softened, the thermoplastic resin layer (7) can be removed by simply press-fitting the score line forming protrusion (c) into the part where the score line mackerel is to be formed. ) can be easily and quickly removed, so the score line can be easily removed without biasing the metal foil (6) and without leaving the entire thermoplastic resin layer (7) on the outer surface of the metal foil (6). @ can be formed to a predetermined depth. Furthermore, the container body (1) and the container lid (23) are bonded together, and the score line (2) is attached to the container lid (2).
Since the process can be carried out simultaneously with the formation of the force, it is possible to simplify the manufacturing process and improve efficiency.

In the above method, the method of adhering the container body (1) and the container lid (2) and forming the score line on the container M (21) were performed simultaneously, but the metal foil (6) heated by the heating means
After melting the thermoadhesive resin layer (8) and bonding the container body (1) and the container lid (2), the metal foil (6) which has already been heated by the heating means is used to soften the thermoplastic resin layer (8). Resin layer (7
] You can also form a score line @.

In the drawing, (to) is the container lid (2) used to break the score line @.
), a tab provided continuously on the lower edge of the peripheral wall αα of (2
) is a bottom lid that seals the bottom of the container body (1).

(Effects of the Invention) According to the present invention, the method for manufacturing a container according to the first invention includes fitting the inner surface of the peripheral wall of the container lid to the outer surface of the opening of the container body, and removing the metal of the peripheral wall of the container lid. The foil is heated by high-frequency induction heating means, and the heated metal foil melts the thermoadhesive resin layer on the inner surface of the metal foil, thereby bonding the outer surface of the opening of the container body and the container lid. At the same time as adhering to the inner surface of the il wall,
The heated metal foil completely softens the thermoplastic resin layer on the outer surface of the metal foil, and only this thermoplastic resin layer is removed by the score line forming protrusions to form the opening score line. Adhesion between the outer surface of the opening of the main body and the inner surface of the peripheral wall of the container lid, which is made by coating the outer surface of metal foil with a thermoplastic resin layer, and the formation of score lines on the thermoplastic resin layer on the outer surface of the peripheral wall of the container lid. This has the effect of allowing continuous and efficient formation.

Further, the container manufacturing apparatus of the second invention is movable up and down, and the container body has a container body in which the peripheral wall of the container lid, which is coated with a thermoplastic resin layer on the outer surface of the metal foil and a thermoadhesive resin layer on the inner surface, is fitted into the opening. A lifter is provided with a holding part for holding the container, and a high-frequency coil is used to heat the metal foil of the container lid that is fitted onto the container body held by the lifter, and the heated metal foil is used to bond the thermoadhesive resin layer on the inner surface of the container lid. This lid crimping system is equipped with a high-frequency induction heating device that melts and softens the thermoplastic resin layer on the outer surface, and a lid crimping mold group that is divided into a plurality of parts and arranged at the raised position of the shutter so that the diameter can be freely reduced. When the diameter of the mold group is reduced, it is fitted onto the container body held by the lifter, and then the peripheral wall of the container lid is pressed against the container body, and is melted by the heating device, and the opening of the container body is formed by the heat-adhesive fat-resistant layer. The inner surface of the peripheral wall of the container lid is adhered to the outer surface of the container lid, and a score line forming protrusion with an acute-angled tip provided on the inner wall of the lid crimping type group is made of thermoplastic resin heated and softened by the heating device. The metal foil of the container lid is heated by a high-frequency induction heating device, and the heated metal foil melts the thermoadhesive resin layer on the inner surface and the thermoplastic resin layer on the outer surface. The resin layer was softened, and the lid pressure bonding board group in the lid crimping chamber, which generates the protrusion money for score line formation, was brought into contact with this container lid, so that the W4 wall of the container lid was brought into contact with the outer surface of the opening of the container body. It is effective to provide an apparatus t which can bond the inner surface of the container lid and easily and continuously form a score line of a predetermined shape on the thermoplastic resin layer of the peripheral wall portion of the container lid.

[Brief explanation of the drawing]

FIG. 1 is a cutaway side view showing an example of the apparatus for implementing the present invention, FIG. 2 is a view from the human line arrow in FIG. The drawings are: Fig. 1 is a view taken along the line A-A showing the lid crimping mold group expanded above the tapered spindle; Figs. 4 and 6 are diagrams for explaining the manufacturing process; Fig. 5 is an enlarged view of part B in Fig. 4, Fig. 7 is an enlarged view of part 0 in Fig. 6, and Fig. 8 is a partially cutaway side view showing an example of a container obtained by the manufacturing method of the present invention. be. (1) Container body (2) Container lid (3) Opening (6)
...Metal foil (sword) ...Thermoplastic resin layer (8) ...Thermoadhesive resin layer α01---
- Peripheral wall part (111...
...Li) Ta--1■...-High frequency induction heating device (131...Lid crimping chamber (1
4...Holding part α9...High frequency coil (lI...Inner wall wire...
...Lid crimp amount (sha)...Score line
(c) 2 people outside the ridge for score line formation Figure 1 Figure 2

Claims (1)

[Claims] 1. The outer surface of the opening of the container body, and the inner surface of the peripheral wall of the container lid, which is formed by covering the outer surface of metal foil with a thermoplastic resin layer and the inner surface with a thermoadhesive resin layer. In a method of manufacturing a container by bonding and forming a score line for opening on the thermoplastic resin layer on the outer surface of the peripheral wall of the container lid, the inner surface of the peripheral wall of the container lid is fitted to the outer surface of the opening of the container body. Then, the metal foil on the peripheral wall of the container lid is heated by high-frequency induction heating means, and the heated metal foil melts the heat-adhesive resin layer on the inner surface of the metal foil, thereby bonding the outer surface of the opening of the container body and the container. In addition to adhering the inner surface of the peripheral wall of the lid, the heated metal foil softens the thermoplastic resin layer on the outer surface of the metal foil, and only this thermoplastic resin layer is removed with score line forming protrusions for opening. A method for producing a container, characterized by forming a score line. 2. A lifter that can be raised and lowered and includes a holding part that holds a container body in which the peripheral wall of a container lid whose outer surface of metal foil is coated with a thermoplastic resin layer and whose inner surface is coated with a thermoadhesive resin layer is fitted into the opening. Then, a high-frequency coil heats the metal foil of the container lid that is fitted onto the container body held by the lifter, and the heated metal foil melts the thermoadhesive resin layer on the inner surface, and the heat on the outer surface of the container is melted. It is equipped with a high-frequency induction heating device that softens the plastic resin layer, and a lid crimping mold group that is divided into a plurality of parts and arranged at the raised position of the lifter so that the diameter can be freely reduced. The circumferential wall of the container lid fitted onto the held container body is pressed against the container body, and the inner surface of the circumferential wall of the container lid is bonded to the outer surface of the opening of the container body using the heat-adhesive resin layer melted by the heating device. and a lid crimping device for press-fitting a score line forming protrusion provided on the inner wall of the lid crimping mold group and having an acute-angled tip into the thermoplastic resin layer heated and softened by the heating device. Equipment for manufacturing containers.