Resealable, rectangular container with lid for preferably hot-filled goods

Abstract

Resealable, rectangular container with lid for preferably hot-filled goods, characterized in that 1. Container (1) and lid (2) have rectangular opening designs and shapes (Fig. 1 and 2). 2. The containers (1) and lids (2) are made of glass, plastic or metal. 3. The lid (2) and / or container (1) have a ventilation hole (4) which is closed again with a sealing compound (5) (Fig. 2 and 4). 4. The sealing compound (5) is characterized by the possibility of opening the container by breaking the seal and letting in air. 5. The sealing compound (5) must be temperature-resistant with regard to the hot contents. 6. The container (1) and / or the closure (2) are provided with a temperature-resistant sealing compound (3) between the parts (Fig. 2, 4, 5 and 6). 7. The lid and / or container are provided with a circumferential recess (6) to accommodate the sealing compound (3). 8. The sealing of the container / lid is achieved when the product cools down due to the negative pressure of the air in the head space. 9. The headspace volume can also be filled with other gases, such as inert gases or the like. 10. Reclosure after opening the seal is characterized by the use of a tape (8) (Fig. 5) applied during labeling. 11. Further reclosure options are best achieved by using tabs (9), (Fig.6), which are located directly on the lid or container and / or by resealing with vacuum build-up in the container. 12. The designs of the container base (7) and lid (2) are geometrically adapted for stacking (Fig. 3 and 4).

Description

List of reference symbols (Fig.1-6) 1 rectangular container 2 lids 3 Sealant 4 ventilation holes 5 Sealing compound 6 guide groove 7 radii with adjustment for stacking 8 tape for reseal 9 Bendable tab for reclosure State of the art

[0001] Hot products, such as jams, are typically filled into round containers made of glass, metal, and / or plastic, and the closures (lids) are applied by sealing and / or threading. Threaded closures (white caps / twist-off) in particular are bound to a round geometry and require additional material for threading. The advantage of threading is easy reclosure after opening and partial removal of the product.

[0002] Sealed closures cannot be resealed because the opening occurs when the seal is destroyed.

[0003] The disadvantage of round closures is the geometric losses during material use and transport, which can only be partially mitigated by partially adapted angular bodies.

[0004] Another disadvantage is that it is not always possible to empty the containers completely due to undercuts, radii... and existing geometric obstacles.

[0005] Proper stacking is also problematic and results in volume losses during transport. The inevitable gaps that form when stacking round objects also result in a significant loss of potential transport volume.

[0006] Necessary transport aids, such as pallets, cardboard boxes or the like, must inevitably be oversized. novelty

[0007] To improve the space utilization of packaging containers after filling, a rectangular container or lid system for hot filling products (e.g. jam) is proposed ( Fig. 1, Fig. 2, Fig. 3, Fig. 4). The shape of the containers (1) allows for complete emptying of the product. After filling, the lid (2) is positioned on the container, and the sealing compound (3) precisely seals the contact area between the rectangular container and the rectangular lid.

[0008] In addition to the space savings, the material utilization factor of the closures is enormous, as, unlike the round threaded body, no additional materials are required. The additional forming and processing required for the threaded insert is also eliminated, saving material on the lid and container.

[0009] The round lid geometries also require a specific process for applying sealant after forming. This process is eliminated and can be integrated directly into the printing and punching process, for example, since the finished lids have a very flat geometry.

[0010] Preferably on the lid (2) there is a small opening (4), which has been closed again with a temperature-resistant sealing compound (5) ( Fig. 2 and Fig. 4).

[0011] As the filling mass cools, a negative pressure of approximately 15,000 Pa is automatically created (see the following rough example calculation for a hot jam).

[0012] During cooling, it is important to position the lid precisely to the container and to apply initial pressure to the sealing compound to ensure a secure closure and prevent leaks and thus air intake during the cooling phase.

[0013] The unit can then be opened by removing the sealing compound (5), as the lid (2) loses its pressure due to the negative pressure.

[0014] The disadvantage of this method is that the unit has to be resealed if part of the goods are removed.

[0015] This disadvantage could be overcome by the use of tapes applied during labelling (8) ( Fig. 5) or by using flexible tabs (9) on the container or closure ( Fig. 6), be eliminated. Appendix: Calculation example “Negative pressure in the container after cooling of the contents”

[0016] Example: Jam jar with a headspace volume of approx. Ø 6.5cm × 2cm => approx. 65cm 3 . The volume shrinkage of the contents and the container is neglected: Vn=Vv

[0017] From general gas laws follows: pv×Vv / Tv=pn×Vn / Tn p, T, V stand for pressure, temperature and volume

[0018] The indices n and v stand for after and before.

[0019] Typical process data are an air pressure of 100,000 Pa (approx. 1 bar) and temperatures of 80° during hot filling and then cooling to 20° room temperature. pn=pv×Tn / Tv=100,000 Pa×298K(=25°C) / 353K(=80°C)=84,419 Pa ➯ A negative pressure of approximately 15,000 Pa compared to the ambient temperature is created in the container during cooling, automatically sealing the container and lid.

Claims

[1] Resealable, rectangular container with lid for preferably hot-filled goods, characterized by , that 1. Container (1) and lid (2) have rectangular opening designs and shapes ( Fig. 1 and Fig. 2).

2. The containers (1) and lids (2) are made of glass, plastic or metal.

3. The lid (2) and / or container (1) have a ventilation hole (4) which is closed again with a sealing compound (5) ( Fig. 2 and Fig. 4).

4. The sealing compound (5) is characterized by the possibility of opening the container by breaking the seal and letting in air.

5. The sealing compound (5) must be temperature-resistant with regard to the hot contents.

6. The container (1) and / or the closure (2) are provided with a temperature-resistant sealing compound (3) between the parts ( Fig. 2, Fig. 4, Fig. 5 and Fig. 6).

7. The lid and / or container are provided with a circumferential recess (6) to accommodate the sealing compound (3).

8. The sealing of the container / lid is achieved when the product cools down due to the negative pressure of the air in the head space.

9. The headspace volume can also be filled with other gases, such as inert gases or the like.

10. A reclosure after opening the seal is characterized by the fact that a tape (8) ( Fig. 5) is used.

11. Further reclosure options are best achieved by using tabs (9), ( Fig. 6) which are present directly on the lid or container and / or with a new seal with vacuum build-up in the container.

12. The designs of the container base (7) and lid (2) are geometrically adapted for stacking ( Fig. 3 and Fig. 4).

Images