JPS63125147A - Sealing of cover for vessel - 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 relates to the sealing of a container lid that is intended to be opened by a user.

Gable-topped or flat-topped cartons made of cardboard coated on both sides with thermoplastic are common. Hot air heats the surface area of the thermoplastic until it becomes uniformly sticky, then a pair of jaws is used to press the sticky areas together while they cool to create the fins. It is known to seal a top lid with an openable spout and a bottom lid in this manner. However, for fins that include the spout area, the need to ensure that the fin is sufficiently sealed to be liquid-tight and the consumer to ensure that the spout is easily opened. There is a contradiction between what is desired and what is required. As one step closer to resolving this contradiction, it has also been known to apply an adhesive substance to selected mating surfaces of the fins at the spout to inhibit sealing and make the spout easier to open. ing.

The hot air heating described above tends to be uneven and imprecise, and requires two process stations. As known from US Pat. No. 3,309,841 and European Patent Specification No. 0028,941A,
Heating or spouting of surfaces that are not to be sealed by using a nozzle of the type with a linear array of holes or slots to direct hot air toward the surface to be made sticky. The aim is to minimize undesired heating of selected surface areas. In the above-mentioned European patent specification, the jaws are provided with shallow and long recesses to prevent the pressure of the jaws from being applied to the adhesive application surface of the spout of the fin. However, even with this, inaccuracies and non-uniformities are inevitable, resulting in poor sealing of the fins and difficulty in opening the spout.

For this reason, ultrasonic welding using an ultrasonic horn and anvil has recently come into increasing use.

This is because both accuracy and uniformity can be achieved.

U.S. Pat. No. 3,912,576 discloses a carton sealing device for sealing the rectangular bottom lid of a thermoplastic coated cardboard carton. The device includes an anvil and an ultrasonic vibration tool.

Place the anvil into the carton by folding the lid to be sealed over the smooth edge of the anvil. When an ultrasonic vibrating tool is pressed against the lid from the side opposite the anvil and energized, the thermoplastic coating on the cardboard begins to flow and the ribs protrude into a "bow tie".
Ribs with different heights relative to the end face of the vibrating tool accommodate variations in the number of cardboard layers in different areas of the lid. Devices similar to this are U.S. Patent Nos. 3,971,300 and 4,01.
No. 1,800.

U.S. Pat. No. 3,956,975 discloses a method and apparatus for making spouted gable-top cartons from flat stock, in which the corner seams of the carton, the flat The bottom lid and the gabled top lid are all sealed by ultrasonic welding at separate stations. The sealing of the gable top fins is achieved by a retractable central vibrating horn located on one side of the forward path of the filled carton and a retractable anvil located on the opposite side of the forward path. This is done by Two separate configurations of ultrasonic welding equipment are used to accommodate the change in the fin from the upper two-layer section to the lower four-layer section.

In the first one, the anvil is a single piece anvil shaped to fit the contour varying from two to four layers on the fin side, and the horn varies from two to four layers on the fin side. It is a single piece horn shaped to fit the contours of the vehicle. In the second one, two horns and anvils are used.
Weld the ply sections and use another set of horns and anvils to weld the four ply sections. In both cases,
The weld extends as a band of constant width from one end of the fin to the other.

With this welding, it is disadvantageous that the spout is opened by the consumer if the first area of the contents of the container is not intended to be opened by the consumer, according to the first feature of the invention. A method for sealing a lid of a container having a second area intended for use in a container includes the steps of heating the surface portions of the first areas that are in surface contact with each other by ultrasonic waves to make them sticky; and the step of ultrasonically heating the surface portion of the second zone to make it sticky, characterized in that the surface portion of the second zone is heated in proportion to the area of the second zone. The reason is that it extends less than the surface area of the area.

According to a second feature of the invention, a first area comprising surface parts not intended to be opened by the consumer of the contents of the container and sealed together by ultrasonic heating;
a second surface portion intended to be opened by the consumer and comprising surface portions sealed together by ultrasonic heating;
, the surface portion of the latter being a second area.
A container is provided, characterized in that the first area extends less than the surface area of the first area in proportion to the area of the first area.

In order that the invention may be clearly understood and easily carried out, the sides of a gable-topped carton with a spout and an ultrasonically welded top lid are fabricated from material according to Figure 1; Before filling and sealing the top, it has the shape shown in Figure 2 of that patent. See attached diagram. The carton is conventional, made of cardboard with a plastic coating on both sides, and has four main looped sub-panels (one of which can be seen in the drawings and is designated with the reference numeral l). ), four loop-shaped closure subpanels (three of them
are seen in the drawings and labeled with reference numerals 11-13), and four looped top sealing subpanels (three of which are seen in the drawings) sealed together to create a sealing fin 16. , and reference numbers 21-23
), the fins being torn open from the end of the fin indicated by a printed or recessed arrow 17, the folded sub\panel 12.22 being pulled out and 2. forming a pouring spout defined by two symmetrical, diagonally striated fold lines (one of which is visible in the drawing and is marked with the reference numeral 5) and The rectangular inner surface layer 18 prevents sealing subpanel 22 from being oversealed to subpanel 21 and the remaining sealing subpanel not provided with a reference numeral, and facilitates spout withdrawal. I have to.

The accompanying figure shows an example of a suitable sealing profile for an ultrasonically welded fin 16 using an ultrasonic horn and an anvil.

The shape of the seal includes a linear continuous seal 44 over the entire length of the two-layer upper portion of the sealing fin 16 between the sealing subpanel 21 and a sealing subpanel not provided with reference numerals. A small sealing block 45 is created in the upper area of the end of sub-panel 22 and in the portions of sub-panel 21 and sub-panels not provided with reference numerals adjacent to said upper area. This block extends above the top edge of the subpanel.

In the upper area of the sub-panel 23 there is a block 46 which corresponds to the previously described block 45 but is much larger.
, and this block 46 is part of a band 47 extending to the spout end of the sealing fin and continuing to the seal 47 which bends over the lower part of the four main layers of the fin 16.
The rim is also wider at block 46. Finally, the sealing configuration includes a block 48 directly below block 46.

The working surface of the horn has areas 44-48 to be sealed.
The working surface of the anvil is also formed with projections corresponding to these areas. No protrusions are provided facing the adhesive layer 18. Sealing 4
5.46.47 may be close to layer 18.

This selective ultrasonic welding of the fins 16 results in high quality,
This provides the advantages of being able to provide accurate sealing and also being able to cleanly and easily draw out the spout.

[Brief explanation of the drawing]

The attached drawing shows a top lid with an ultrasonic seal and a spout.
1 is a side view of an embodiment of a carton of the invention having a gabled top; FIG. 1. Main sub-panel, 5. Fold line, 11.12°13
...Top lid sub-panel, K...Sealing fin, 18...Inner surface layer, 21.22.23...Top lid sealing sub-panel, 44,
45.46.47.48...Selected sealed area.

Claims (1)

[Claims] 1. Surface portions (46-48) in surface contact with each other of the first area, which are not intended to be opened by the consumer of the contents of the container, are heated ultrasonically to make them sticky. and ultrasonically heating the mutually contacting surface portions (45, 47) of the second zone intended to be opened by the consumer to make them sticky. In the method of sealing, said surface portion (45, 47) of said second zone is proportional to the area of said second zone;
A method for sealing a container lid, characterized in that it extends less than said surface portion (46-48) of said first zone. 2 Patent comprising the step of applying an adhesive to the other surface portions of said second zone which are brought into surface contact with each other before the surface portions (45-48) of said first and second zones are made sticky. A method according to claim 1. 3. a first zone comprising surface portions (46-48) which are not intended to be opened by the consumer of the contents of the container and which are sealed together by ultrasonic heating;
surface parts (45,
47), the surface portions (45, 47) of the latter being in proportion to the area of said second zone, A container characterized in that it extends less than the surface portion (46-48). 4. The surface portions of the first zone (46-48) and the surface portions of the second zone (45, 47) are defined by the meandering band (45, 47) extending from one side of the lid to the other and sealing the lid. 47) The container according to claim 3, wherein the container has a surface portion that is 47). 5. A container according to claim 4, wherein the width of the band (47) is generally wider in the first zone than in the second zone. 6. Said lid is said carton end lid and comprises a sealing fin (16) comprising mainly four layered sections extending from one side of the lid to the other and comprising a spout section in a second region. 6. Container according to claim 4 or 5, in the form of a carton, in which said bent strip (47) extends the entire length of said mainly four-layered section. 7. The fin (16) extends from one side of the lid to the other and includes a two-layer section located primarily just outside the four-layer section, and the band (47) comprises a two-layer section in the first area. 7. A container according to claim 6, which is located on top of a container. 8 The surface part (45, 47) of the second area is the fin (16)
at said end of the fin (16);
8. A container according to claim 7, overlying a layer section. 9 The surface part (46-48) of the first area is the band (47)
9. Container according to claim 6, 7 or 8, comprising a block (48) of the surface part located inside the container. 10 first loops arranged around the carton and interconnected by fold lines and upright sealing seams.
, second, third and fourth panels, the other fold lines extending around the carton, and sub-panels (1, 11-1) forming a loop arranging the panels around the carton.
3, 21-23), the loops of these sub-panels forming the aforementioned sealing fins (16), the higher loops of the top sealing sub-panels (21-23), and the first, The lower loops of the second, third and fourth top closure sub-panels (11-13) and the upright fold line centered on the second and fourth closure sub-panels (22, 23); and another fold line extending across the fold line of Occlusion sub-panel (12,
(13) extending from the center of each edge area to the corner area of the sub-panel (12, 13) furthest from that edge area) and diagonally from the uppermost edge area of the first and third panels. first and third extending furthest from the uppermost edge area and closest to the second closure sub-panel (12);
a weakening line of the panel, such that said second sealing sub-panel (22) and said second occluding sub-panel (12), when drawn outwardly, connect the first and second panels. 7. A container according to claim 6, wherein the containers are bent around their weakening lines (5) to form a spout.