JPS61273309A - Sealing head - Google Patents

Abstract

1. A sealing head (1) for sealing a covering film (8) to the rim (6) of a vessel, in particular to the rim (6) of a glass vessel (5), consisting of a deformable heatable metal disc (9) provided with slots (27) extending substantially radially towards the centre, characterised in that the slots (27) divide up the metal disc (9) into a plurality of narrow lamellae (25) connected to the metal disc (27) along the perimeter and in that the lamellae (25) are connected with the metal disc (9) at the peripheral point of attachment by means of a narrow bridge (31) formed through a reduction in cross-section.

Description

DETAILED DESCRIPTION OF THE INVENTION The invention relates to a sealing head according to the preamble of claim 1.

The flatness of the sealing edge of glass containers is significantly impaired due to non-uniform cooling during manufacturing, and therefore, if the sealing head is used without taking this non-flatness into account, the sealing of the lid or the container may be When sealing, porosity becomes a problem. The thin foils used as lids, often laminated aluminum foils, are unable to balance this non-flatness.

Ninth sealing heads for sealing foils made of metal and synthetic materials onto glass containers are known.

German Published Patent Application No. 2915115 discloses a sealing head whose sealing surface consists of a metal disk in which slits are formed along the curved surface. The region of the disc in which the slit is formed is curved downward into a conical shape. In addition, the downwardly curved curved area of this disk may cause the sealing head to drop and roll over the edge of the glass container in case the foil inserted between the disk and the edge It is curved downward so that it is pressed against the upper part of the body.

During this transfer, it is inevitable that the part of the disc that comes into contact with the shoe will slide on the shoe, causing damage to the shoe.

A sealing head 4 comprising a metal film pasted on silicone rubber has become known. Such sealing heads have the disadvantage that the heating of the membrane takes place only very slowly due to the poor thermal conductivity of the silicone rubber.

Due to the fragility of silicone rubber, the sealing surface loses its conformability to glass containers, which is necessary for sealing, very quickly.

Known sealing heads also have the disadvantage that the sealing process takes a long time due to poor thermal conductivity, and because the process is carried out in two stages, only a small machine layout can be achieved. have. Furthermore, the slowness of the sealing operation has an effect on the filling material (for example mayonnaise), which changes from time to time. In addition to this, the sealing part warps due to the action of heat over a long period of time, which causes creases to form in the sealing part, rendering the sealing part wasteful and useless. In order to obtain the necessary sealing pressure at the sealing edge, a large force from the sealing head is applied to the glass containers, which inevitably causes breakage of the glass containers.

The object of the invention is to create a sealing head that is convenient and inexpensive to produce and does not have the disadvantages of the known sealing heads mentioned above.

The above-mentioned object is solved by a sealing head having the features as claimed in claim 1.

The present invention makes it possible to generate a high surface pressure acting along the entire sealing edge with the intended force under concentrated heat supply and independent of the flatness of the sealing green surface. Become. With a single sealing head) it is possible to easily seal lids of different diameters within a certain area.

Since this sealing head does not require any additional pressure medium, it has a very compact design and can be used in all known sealing machines.

Further advantageous developments of the invention are specified in the patent claims 2 to 11.

The bonding of the laminate by means of the sealing head on a narrow web makes it possible to swing the laminate laterally and thus also to allow local adaptation at the edge surfaces. Notches filled with metal balls, metal chips or granules and provided on the laminate allow for precise contouring of the pressing surface against the edge surface and excellent specific heat transfer from the heating element to the laminate. Make it. The heat stored in the cutout prevents the temperature of the sealing surface from dropping rapidly when contact with the glass edge is made. Heat transfer takes place only at the edges (through holes formed in the center of the sealing surface), leaving the center of the lid cold.

If the sealing surface is annularly supported in the center, it is possible to use fine and thin laminates that closely adapt to the unevenness of the surface.

The invention will now be described in detail with reference to the embodiments illustrated in the accompanying drawings.

The nine seal head 1 shown in FIG. 1 (not shown)
A vertically movable piston 5 that is movable in the axial direction of a conventional sealing machine
Fixed. Glass containers 5, which are located immediately below the sealing head 1 and are provided with a sealing edge 6, rest on a base 7. A disk-shaped metal plate 9, which will be described in detail below, is fixedly held by screws 11 between the sealing head body 13 and a fixing ring 15 capable of holding down the sealing head body 13. It is also possible to directly fix this metal disk 9 to the sealing head main body 13tC with screws 11. A closure or lid 8 made of metal is inserted between the metal disk 9 and the sealing edge 60.

The metal disk 9 rests on the stepped portion 17 at the center. A hole 19 is formed in the center of the stepped portion 17 and is connected to the back surface of the sealing head body 13.

Above the metal disk 9 are metal balls, metal scraps, or metal particles 2.
A notch 22 filled with 1 is provided. A heating body 23 made of a wire laid in a * shape or a spiral shape heats the sealing head body 1 3 and the metal disk 9 connected thereto for good heat conduction.

The heating part 23 is located inside the sealing head main body 13 or in the notch 2.
2 (indicated by a broken line).

Recesses 2 and 2t are provided with a number of slits 27 which divide the covering metal disk 9 into laminations 25 and which run essentially in the radial direction.

The slit 27, formed by wire corrosion or laser treatment, has a width of approximately %n) and ends at a small distance d from the periphery. At this end slit 27! riV-shaped or branched (M2
) or terminates in a circular or polygonal cutout 29 (see FIG. 3) @ the spacing dFi of the web 31 between the ends of the slit 27 or between the cutouts 29, preferably in the central hole. 33 is present, one interval a corresponding approximately to the width C of this stack 250 at the nine ends facing the central part of the stack 25 and CI/i depending on the size and thickness of the metal disc 9, approximately 01g to 2.0 songs.

The stack 25, whose end facing towards the center rests on the step 17, bends during sealing due to the action caused by the sealing edge 6 and adapts to the surface shape of this sealing edge. Since the web 31 is narrow compared to the width of the laminate 25 at the loading position on the sealing edge 6, the laminate 25 additionally swings by its longitudinal axis and completely contacts the surface of the sealing edge 6. come into contact with The width of the slit 27 is so small that a sufficient pressing force can be obtained there as well and sufficient heat transfer to the girth 8 to be sealed can take place.

Instead of a radially running slit 27, it is also possible to form a wave-shaped slit 27.

However, it is not necessary to form the central hole 33 in the metal disk 9, and in this case no support is provided at the central portion. The thickness of the metal disk 9, which is preferably made of an elastic material, for example spring steel or other heat-resistant steel and whose surface is hardened, depends on the diameter of the sealing edge 6; It's a beautiful day. That is, for relatively large glass containers, it is about 1H or more.

Of course, the metal disk 9 may have a shape other than a circular shape. Depending on the occasion, the shape may be polygonal or oval.

The diameter of the metal sphere 21 is set larger than the width of the slit 27 (or the size of the notch 29). Metal sphere 21Fi material with extremely good thermal conductivity,
especially made of metal.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the circular sealing head and container, and FIGS. 2a, 2b, and 3 are plan views of the metal disk forming the sealing surface, respectively. The symbols in the figure are: 9...Metal disk 25...Laminated body 27...Metal disk

Claims (11)

[Claims] (1) In a sealing head for sealing a closure foil consisting of a deformable, slit and heatable metal disc to the edge of glass containers, in particular to the line of containers made of glass. , the slit (27) is a metal disc (
9) is divided along the periphery into a number of laminated bodies (25) which are connected to the metal disc (27). (2) The sealing head according to claim 1, wherein the slit (27) branches in a V-shape on the peripheral side. (3) At the circular end of the slit (27), the metal disc (
9. Sealing head according to claim 1, in which an annular or polygonal cutout (29) is provided. (4) A metal disc (9) is connected to the sealing head (1) along its periphery, in which a cutout (22) is formed in the area above the laminate (25). A sealing head according to any one of claims 1 to 3, wherein the sealing head comprises: (5) The notch (22) is formed in an annular shape, and the free end facing toward the center of the metal disk (9) of the laminate (25) is located at the step (17) in the sealing head (1). A sealing head according to claim 4, wherein the sealing head is supported. (6) The notch (17) is filled with metal spheres, metal chips, or metal granules (21).
The sealing head according to item 1 or 5. (7) within the notch (22) and/or in the notch (22);
heating part (23) for heating the metal disc (9) on )
7. A sealing head according to claim 6, wherein the sealing head is provided with: (8) A sealing head according to any one of claims 1 to 7, wherein the metal disc (9) is provided with a hole (33) in the center. (9) The end portion of the laminate (25) facing toward the center is supported by the annular stepped portion (17) at the center of the notch (22). The sealing head described in section. (10) According to any one of claims 1 to 9, wherein the metal disk (9) is made of an elastic material with a hardened surface and good heat conduction. Seal head. (11) The distance (a) between the ends of the slit (27) is 0.
5 to 2.0 mm, and the thickness of the metal disc (9) is 0.2 mm.
~1.0 mm, claims 1 to 10
A sealing head described in any one of the preceding paragraphs.