FI109893B - A packaging made by molding method - Google Patents

Description

109893 j

Deep drawing packaging

The present invention relates to a deep draw method package comprising a box portion and a lid having an inner wall at the edge of the box portion, an outwardly facing upper wall at the top of an inner wall and an outer wall facing downward from the outer edge of the upper edge. , at the top of the inner wall, an outwardly directed upper edge and an outer wall downwardly from the outer edge of the upper edge, the box portion and the lid being superposed so that they are substantially sealed against one another and the outer wall of the box portion and the outer wall of the lid at least one of the curved portions being substantially at the same position when the package is closed.

Deep drawing packages are known from a box 15 whose box portion is bent outwards to the bottom. The lid over the box is shaped such that its center is below the edges of the box portion and the edges of the lid are folded in line with the edges of the box portion. Further, the edge of the lid is folded so that it sits below the outermost portion of the edge of the box portion, whereby the lid locks into place. The box portion seals against the lid 20 through the outermost tip portion of its edge, thereby covering the lid and the box portion. sometimes there is a linear contact surface. However, such a linear contact surface is not sufficient to ensure sealing when handling the container, whereby odors: “and liquid products can escape from the container.

• *. · Further, the deep draw method has been used to make packages in which the edge of the • • jj. The lid to be placed is shaped similarly. In order to secure the lid, recesses are made in the corners of the lid, which on the inside press against the outer edges of the box part. Also, such a box, ·, in which the box part and the lid are supported by straight surfaces, is not • sufficiently tight to pack, for example, strong odorous substances or liquids.

It is an object of the present invention to provide a package made by a deep drawing method which is so sealed that it can also be used with force. for the storage of dessert substances and liquids.

; The packaging according to the invention is characterized in that at least two substantially identical and uniformly contacting surfaces are formed on the outer wall of the box edge and on the outer wall of the lid edge, and when the package is closed, , the curved portions of which are substantially uniform in shape and size throughout the periphery of the package, whereby the curved portions seal the lid to the lattice portion.

An essential idea of the invention is to provide a curved cross-sectional part around the box in both the outer portion of the box edge and the outer edge of the lid edge, respectively. The curved portion of the box portion and the curved portion of the lid edge are formed of substantially the same size, shape, and location.

An essential advantage of the invention is that the curved portions of the box part and the lid form a wide contact surface with each other, which makes the package tight. Such a contact surface formed by two curved surfaces also allows tolerances in the manufacture of the package, without however substantially affecting the sealing of the package.

The invention is explained in more detail in the accompanying drawing, in which Figure 1 is a perspective view of the package according to the invention, Figure 2 is a cross-sectional view of the package of Figure 1 and. Figure 3 is a cross-sectional view of a package according to another embodiment of the invention.

Figure 1 shows a package 1 of thin plastic material according to the invention. 1. Package 1 has a box part 2 and a lid 3. The lid 3 has a projection 3f at one corner to lift the package 1. easiest to open.

The box part 2 and the lid 3 are made by a deep drawing method. In the deep drawing method, the plastic film is first heated. After that heated, ·. : The plastic film is inserted between the molds, whereby one side of the film is sucked with • I t! / 30 soil and the other side is supplied with air, whereby the plastic film is shaped to form a ·; *. The molded plastic film is then removed from the mold and the molded: V: cut pieces are cut off from the film.

Figure 2 shows the edge of the package 1 according to the invention. cross-section. The numbering of Figure 2 corresponds to the numbering of Figure 1. Packaging; The 35 1 edge has substantially the same cross-section. The edge of the box portion 2 of the package 1 is shaped such that the inner wall 2a is first bent outwardly and then further downwardly to form an outer wall 2b and once again outwardly to form a collar 2e. An inwardly curved portion 2c is formed on the outer wall 2b.

The lid 3 is centrally located below the top of the box part 2. The edge of the lid 3 is folded such that the inner wall 3a of the edge is parallel to the inner wall 2a of the box part 2 and said inner walls 3a and 2a are substantially tight against each other. The edge of the lid 3 is further folded from its upper part parallel to the upper edge of the box part 2. Further, the edge of the lid 3j is bent to form the outer wall 3b in the direction of and close to the outer wall 2b of the box part 2 of the box. The edge of the lid 3 folds from the further 10 outer walls 3b to form a collar 3e similar to that of the box portion 2. The flanges 2e and 3e stiffen the structure of the lower part of the outer wall 2b of the edge of the box part 2 and the lower part of the outer wall 3b of the lid 3. An inwardly curved portion 3c corresponding to the curved portion 2c of the box portion is formed on the outer wall 3b of the lid 3. The curved portions 2c and 3c are substantially similar in shape and size to those in contact with each other and, in addition, are substantially at the same height when the lid is closed.

Since the inner walls 2a and 3a are supported by each other, they form a whole supporting the package 1. In this case, for example, when the box portion 2 of the package 1 is pressed outwardly, the inner wall 20a of the box portion 2 pushes the inner wall 3a of the lid 3 and further the outer wall 3b of the lid 3, whereby the outer wall 2b of the box portion 2 the gap remains tight.

• · ·; '' When the lid 3 is pressed over the box part 2, the curved part 3c 'of the lid 3 is seated on the curved part 2c of the box part 2, whereby the lid 3 is locked in the box part 2.

The curved portions 2c and 3c form an arcuate sealing surface between them, so that the package 1 is sealed so that it can also be used with strong odoriferous substances and liquids. Such a curved sealing surface also allows tolerance variations and handling of the package without substantially reducing the seal. The curved portions 2c and 3c are preferably in the form of a circular arc T *. The curved portions 2c and 3c may be inwardly curved, as shown in Fig. 2, or they may be outwardly curved.

Figure 3 shows another package according to the invention. 1 edge cross-section. The numbering of Fig. 3 corresponds to that of Figs. 1 and 2; 35 rolls. The outer wall 2b of the edge of the box portion 2 and the outer wall 3b of the edge 3 of the lid 3 respectively have curved portions 2c and 3c, and above them other curved portions 2d and 3d. The curved portions 2c and 2d and 3c and 3d may be curved in opposite directions as shown in Fig. 3, or they may also be curved in the same direction. Further, the curved portions 2c and 2d as well as 3c and 3d may be in the vertical direction either at a distance from one another as shown in Fig. 3, or they may be an extension of each other. If the curved portions 2c and 2d and 3c and 3d are curved in opposite directions and extending in height from each other, they form a structure of substantially S cross-section.

The drawing and the description related thereto are only intended to illustrate the idea of the invention and the details thereof may vary within the scope of the claims. Thus, the material of the package 1 may be any plastic to be molded by the deep drawing method. Further, the shape of the package may vary freely; for example, it may be round, rectangular, or square. Further, the curved portions 2c and 2d and 3c and 3d may be, for example, parabola or asymmetric.

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Claims (3)

109893