JPH021745B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises a cylindrical body made of multilayer packaging material and having a longitudinal seam, and two lids made of multilayer packaging material that are inserted into and seal the opening of the body. It relates to a packaging container of the type in which the lid grips the edge of the body by means of a U-shaped folded edge. In the known packaging container described in DE 16 11 933 A1, the longitudinal seam of the shell is formed by overlapping the longitudinal edges, with the inner longitudinal edge It is shielded by a covering strip. A cylinder with such a longitudinal seam is expensive to manufacture. Moreover, since the wall thickness doubles at the longitudinal seam, sealing the shell and lid at this point requires high sealing pressures and very precise sealing tools. And a very thick sealing layer is required for a perfect seal.

Furthermore, Federal Republic of Germany Patent Application Publication No. 2640311
The body of the packaging container described therein is formed by extruding a seamless tube of plastic and cutting it into individual bodies.
Although in this case it is not necessary to form a longitudinal seam, the production equipment for the shell becomes very large and complex, and such production equipment cannot be integrated into a normal packaging line. Therefore, the cylinders, with or without bottom lids, must be transported to the packaging plant. The lid used in this known packaging container is of multilayer construction, with a very thick reinforcing layer made of injection molded plastic, on each side of which a sealing layer and a sealing layer are applied in separate steps. Therefore, manufacturing the lid is difficult, and the lid must be made at a separate location and transported to the packaging factory.

In contrast, the packaging container according to the present invention, which has the constituent features set forth in claim 1, can be easily made from packaging material wound into rolls by a packaging machine in a packaging factory. . The longitudinal seams are easily formed and sealed very reliably.
A large sealing pressure is not required, and the sealing layer of the lid may be thin. The cover strip covers and seals the abutting edges of the barrel. Although the packaging container according to the invention has a reliable sealing action and is strong, it can be manufactured more easily and inexpensively than known packaging containers.

Furthermore, according to the invention, the multilayer packaging material of the body has, from the outside to the inside, a cover layer made of thermoplastic, a reinforcing layer made of cardboard, a sealing layer made of aluminum, and a sealing layer made of thermoplastic. Moreover, by sealing the outside and inside of the abutting edges of the cylinder, there are no exposed areas of the cardboard, thus reliably preventing moisture from penetrating the cardboard.

Additionally, the aluminum used in the multi-layer packaging for the shell and lid is surrounded by thermoplastic, so when the shell and lid are welded together by induction heating, the aluminum is exposed. There will be no sparks, as there would be in some cases.

Advantageous embodiments of the invention are defined in the second patent claim.
It is described below. In particular, a V-shaped notch is formed on the outer leg of the folded edge of the lid.
Advantageously, the outer leg is brought into close contact with the barrel edge so that the two edges of the notch abut. By using a drawable multilayer packaging material consisting of a reinforcing layer, a sealing layer, and a sealing layer,
The lid can be made extremely cheaply.

In the following, the configuration of the present invention will be specifically explained with reference to embodiments shown in the drawings.

The illustrated packaging container consists of a cylindrical body 1 and two covers 2, 3 that close the opening of the body 1. This packaging container has a sealing effect against water vapor and gases and is particularly suitable for packaging air-sensitive liquid or also powdered and granular foodstuffs and snacks.

The body 1 of the packaging container is formed from a cut section of a sheet of multilayer packaging material and, in the embodiment shown, has a rectangular cross-section with rounded corners. However, the cross section of the body may be circular or oval, or rectangular or polygonal with rounded corners.

The shell 1 has a longitudinal seam 5 at which the edges of the cut pieces meet. In the embodiment shown in FIG. 5, a cover strip 6 covers the entire length of the longitudinal seam 5 on the inside of the container and is tightly welded or sealed to the inner surface of the butt edge. Furthermore, as shown in FIG. 5, in addition to the inner cover strip 6, a cover strip 7 is also sealed on the outer surface of the longitudinal seam 5 on the outside of the container. Instead of this second cover strip 7, a flat welded strip 8 of thermoplastic plastic can also be provided, as shown in FIG.
The inner cover strip 6 may have its edge 9 folded back and sealed to the inner surface of the body 1 in order to prevent the cut edge of the cover strip 6 from corroding as a result of the container contents. Figure 6).

The two lids 2, 3 that close the opening of the barrel 1 have a U-shaped folding edge 11 which surrounds the flat part 10 of the barrel 1 and which grips the edge of the barrel 1 and covers its inner surface and Tightly sealed to the outer surface.
Before the lids 2, 3 are inserted into the opening of the body 1, the folded edge 11 is L-shaped, with an inner cylindrical leg 12 and an outer leg 13 projecting outward at a substantially right angle from the inner cylindrical leg 12. (right half of Figures 2 and 3). The outer leg part 13 has a lid 2 inside the body 1,
3 is inserted, it is bent so as to fit closely against the outer surface of the body 1. In order to avoid the formation of wrinkles during this process, the outer leg 13 is punched with notches 14 in the area of rounded corners, so that when the outer leg 13 is folded, both edges of the notch 14 are punched out. are butted against each other to form a planar shape. In the illustrated embodiment, four V-shaped notches 14 are formed at equal intervals at each corner of the packaging container, and of these four notches, the two outer notches are narrower than the two middle notches. .
The depth of the notch 14 is also smaller than the height of the outer leg 13 of the U-shaped folding edge 11, so that the notch 14 does not reach the folding edge. The notch 14 is formed at the same time as the lid is punched out of the sheet of packaging material. In the punched state, the bottom 15 of the notch 14 is rounded (left half of Figure 2), and when the lid is drawn, the roundness of the bottom 15 disappears and it becomes a pointed V-shape ( Figure 2 right half).

The lids 2 and 3 are deformed into the shape shown in the right half of FIGS. 2 and 3 by deep drawing or drawing the multilayer packaging material. A particularly suitable packaging material has three layers, namely a reinforcing layer 16, a sealing layer 17 and a sealing layer 18, running from the outside inward. These layers can be bonded to each other by means of an adhesive. The reinforcement layer 16 is approximately
100-400 microns, preferably 200 microns thick, polyvinyl chloride, polyester, polystyrene. Made of thermoplastic such as polycarbonate. The seal layer 17 is
It is 20-40 microns thick and consists of an aluminum or iron film. The sealing layer 18, which serves as a bond to the shell 1 and serves as an insulating layer, is approximately 50 microns thick and consists of polyethylene, polypropylene, polyvinylidene chloride, polyester or heat-sealable.

The packaging material for the body 1 is three or four layers. This covers the cover layer 20 from the outside to the inside.
, a reinforcing layer 21 , a sealing layer 22 , and a sealing layer 23
and these layers are bonded to each other by a suitable adhesive. The seal layer 22 may be omitted depending on the case. Printing related to the product can be applied to the outer surface of the reinforcing layer 21. The cover layer 20 is made of polypropylene or high-density polyethylene when the packaging container is to be sterilized, and has a thickness of 12 to 25 microns;
Alternatively, it may consist of a heat seal rack. The reinforcing layer 21 preferably has a weight of 180 to 500 g/m2, ^especially 250 g/m2.
Made of cardboard weighing m ² . The sealing layer 22 required only for packaging containers with a high sealing effect is 7~
It consists of a 12 micron thick aluminum or iron film. The inner sealing layer 23 is the lid 2,
It is made of the same material as the sealing layer 18 of No. 3.

The cover strip 6 which covers the abutting edges of the longitudinal seam 5 and connects them to each other is preferably of three layers, the layers 25, 27 on either side being adapted to the material of the sealing layers 18 and 23. , polyethylene or polypropylene. The intermediate reinforcing layer 26 consists of a biaxially oriented polyamide film or polyester film.
This layer 26 may additionally be coated with polypinylidene chloride or vapor-deposited with aluminum.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the packaging container, Fig. 2 is a plan view of the lid before and after squeezing, Fig. 3 is a cross-sectional view of the lid before and after squeezing, and Fig. 4 is a portion of the lid attachment part. Figures 5 and 6 are partially enlarged cross-sectional views showing two embodiments of the longitudinal seam. 1...Body, 2 and 3...Lid, 5...Longitudinal joint, 6
and 7... cover strip, 8... welding strip, 9... edge, 1
0... Flat part, 11... Folded edge, 12 and 13... Leg part, 14... Notch, 15... Bottom, 16... Reinforcement layer, 1
7... Seal layer, 18... Sealing layer, 20... Cover layer,
21... Reinforcement layer, 22... Seal layer, 23... Sealing layer,
25 to 27...layers.

Claims (1)

[Scope of Claims] 1. Consists of a cylindrical body made of a multilayer packaging material and having a longitudinal seam, and two lids made of a multilayer packaging material that are inserted into an opening of the body and seal it, In a packaging container of the type in which the lid grips the edge of the body by means of a U-shaped folded edge, the multilayer packaging material of the body includes, from the outside to the inside, a cover layer 20 of thermoplastic plastic and a cover layer 20 of cardboard. a reinforcing layer 21 made of aluminum, a sealing layer 22 made of aluminum, and a sealing layer 23 made of thermoplastic; It is configured as a butt seam with two cover strips 6, 7, 8 covering both sides of the abutment edge of the shell, said cover strips 6, 7, 8 being sealed to said abutment edge of the shell. Moreover, the inner cover strip 6 is formed from sealing layers 25, 27 on both sides made of polyethylene or polypropylene and an intermediate reinforcing layer 26 made of polyamide film or polyester film. and
Furthermore, the lids 2 and 3 with folded edges 11 are formed by drawing, and the multilayer packaging material of the lid runs from the outside to the inside, including a reinforcing layer 16 made of thermoplastic plastic and a sealing layer 17 made of aluminum. , has a sealing layer 18 made of thermoplastic plastic, furthermore, the legs 13 on the outside of the folded edges are bent so as to fit tightly against the outer surface of the body 1, and the folded edges 1 of the lids 2 and 3 are
A packaging container characterized in that the outer leg 13 of the container 1 is formed with a notch 14 in the region of the curved part of the body. 2. The packaging container according to claim 1, wherein the cover strip 7 on the outer surface of the body is a welded strip 8 of thermoplastic plastic. 3. The packaging container according to claim 1 or 2, wherein the edge 9 of the cover strip 6 on the inner surface of the body is folded back. 4. The notch 14 is formed in a V-shape with a rounded bottom 15, and when the outer leg portion 13 is bent so as to come into close contact with the body edge, both edges of the notch 14 are butted against each other. A packaging container according to claim 1. 5. The packaging container according to claim 4, wherein the depth of the notch 14 is smaller than the height of the outer leg portion 13 of the folded edge 11.