Method for opening a polystyrene foam sheet container

Abstract

To provide a method for smoothly opening a container in which a lid cover with a folded portion is completely fixed to a container body with a flange formed from expanded polystyrene paper using vacuum molding, without applying excessive force and crushing the container. [Solution] Based on the knowledge that the surface of a vacuum-formed foamed polystyrene paper container has a foamed layer and is of appropriate hardness, and because the polystyrene paper has an appropriate thickness (2-5 mm), cuts are made in the upper and lower parts of the framing part of the container body and the corresponding lower part of the lid, and by lifting it upwards, including the fixed part, the cross section of the sheet splits open with a popping sound. Furthermore, the opening is designed to adhere to the lid's membrane and not separate. Similarly, the same effect can be achieved by placing the container body, which has a fixed wavy perforated opening, into a lid that overlaps with the container body.

Description

Technical Field

[0001] The present invention relates to a container provided with a structure that can reliably open the co-cover of a container vacuum-formed from a closed foamed polystyrene sheet (hereinafter referred to as a PSP sheet) without stress by welding.

Background Art

[0002] Conventionally, as a method of opening a lid cover that is packaged and closed in a natto container or the like vacuum-formed from a PSP sheet, it has been common to peel and open the interface welded with both hands. Prior art document

[0003] Japanese Utility Model Publication No. 63-31940 Problems to be Solved by the Invention of Japanese Patent Application Laid-Open No. 2011-136700

[0004] Since the container body and the lid cover are welded, in order to open it, a finger is placed between the flange portion of the body and the lid, and the container body may be damaged and the contents may spill out due to stress peeling and opening. As a countermeasure, a method that can surely open is provided. Means for Solving the Problems

[0005] Therefore, the present invention is configured as a means for solving the above problems. It has been found that by making perforations or cuts in the upper and lower parts of the PSP sheet surrounding the welded part of the flange part of the lid and the body and folding them, it can be opened. Specifically, by using the thickness of the PSP sheet (1 m / m to 3 m / m), perforations or slits are made parallel to the upper and lower sides on the back side of the lid and the upper and lower sides of the container body, and by folding it upward by 90° or more with the crease line of the lid as a fulcrum, a separated state is formed while the adhesive part of the body remains completely attached to the lid, making it possible to realize an open state. Effects of the Invention

[0006] PSP sheets have been used as food containers with excellent heat retention and insulation properties, but they are also a type of plastic that is prone to cracking. Here, by utilizing this property and its thickness, a method is used to release the bonded area between the container body and the lid. This is achieved by bending the pull hooks PC1, PC2, and PC3 upwards at an angle of 90° or more, using the fold line on the bent side as a fulcrum. Perforations or cuts are made on the upper and lower parts surrounding the heat-welded areas W1 and W2 of the lid CV and the container body C, thereby creating an opening that allows for smooth, stress-free separation of the container body and the lid, including the pull hooks.

[0007] Traditionally, opening a sealed container by hand can sometimes cause the container to break and its contents to spill out, but this can be prevented with this new method. [Brief explanation of the drawing]

[0008] [Figure 1] (A) in Figure 1 is a perspective view when the container is closed. (B) is a perspective view in A1 and B1 showing the state in which the pull hook PFC1 is bent upward with the fingers and joined at the crease BL1, and the section P1 of the container body is completely separated as shown in (D). (C) is a cross-sectional view of the arc portion of (A) cut along the dashed line HA1, showing the state in which the container body and lid are closed at the welded portion W1, and showing the surface film layer TF and the creases CL5, CL6, and CL7. (D) is a cross-section of the arc portion of (A) cut along the dashed line HA1, showing the state in which the pull hook PFC1, including the two welded portions W1, is bent and separated along the crease BL1, with the lid separated in A1 and the section P1 of the container body attached to the lid completely separated in B1. (E) is a perspective view showing the state in which the container body C and lid CV are separated and the container is open.

[0009] [Figure 2] Figure 2 (F) is a perspective view showing the container in a closed state. Figure 2 (G) is a perspective view showing the container opening by bending the pull hooks PFC2 and PFC3 along the creases BL2 and BL3 to release the welded joint W2 between the container body C and the lid CV. Figure 3 (H) is a cross-sectional view of the arc portion of Figure 2 (F) cut along the dashed line HA3.

[0008] [Figure 3] (K) in Figure 3 is a perspective view showing the lid CV with perforations overlapping vertically and the container body with perforations overlapping vertically and closed at the welded portion W3. (L) is a perspective view showing the container body C surrounding the welded portion W3 and the pull hook PFC4 bent upward 180° with the fingers along the perforations in the lid CV to make it open. (N) is a perspective view showing the container body C with mint holes in the lid CV along C3~C4,d3~d4 surrounding the two corner welded portions W2, with mint holes made so that MLD2 and MLU2 penetrate vertically, respectively. (O) is an oblique view showing the pull hooks PFC5 and PFC6 bent upward at C3~C4·d3~d4 respectively to release the welded portion W4 and make it open. (M) is a cross-sectional view showing the state in which the lid perforations MLU1 and MLU2 on the lid CV and the container body perforations MLD1 and MLU2 on the container body C are arranged to overlap vertically and closed by the welded portion W3 and W4. (These are shown as cross-sectional views cut along the dashed lines HA6, HA7, and HA8, respectively.) (P) is a cross-sectional view showing the state in which the pull hooks PFC4, 5, and 6 are bent upward by 90° with the fingers from the state shown in (M), and are divided by the perforations MLU1 and MLU1 and MLD1 and MLU2 as shown in A3 and B3, and the pieces 4, 5, and 6 attached to the welded portion are attached to the pull hooks 4, 5, and 6 without scattering, and are connected to the lid CV by a seamless film layer TF in a state in which the lid can be opened. [Industrial applicability]

[0009] This method is effective for releasing heat-sealed portions of containers that have flanges on the top and bottom, such as those used in the natto industry, fast food industry, bento box industry, takoyaki container, meat industry, fish industry, etc., which are vacuum-formed containers with heat-sealed PSP sheets. [Modes for carrying out the invention]

[0010] A first embodiment of this invention is shown in Figure 1. As shown in (A), the container body C and the lid CV are stacked and closed at two welded joints W1. Cut lines CL1, CL5, and CL8 are made on the lower surface of the container body C, cut lines CL2, CL6, and CL9 are made on the upper surface of the container body C, CL3, CL7, and CL10 are made on the lower surface of the lid CV, and CL4 and CL11 are made on the upper surface of the lid CV. Furthermore, as shown in (B), the pull hook PFC1 is bent upward at the cut line BL1 by fingers at a 180° angle, and due to the properties of expanded polystyrene, it is opened by ripping with a popping sound. As shown in (C), which illustrates the cross-section cut along the dashed line HA1 of the arc portion of (A), it is important that the cuts be made in the surface film layer TF. As shown in (D), which shows a cross-section cut along the dashed line HA2 of the arc portion of (B), the pull hook PFC1 containing the section P1 is lifted 90° upward at the welded portion W1 with the fold line BL1 as the fulcrum, and the section is cleaved and opened as shown in the separated portions A1 and B1. As shown in (E), the container body C and the lid CV are separated and opened, and the thin film layer TF that constitutes the surface between surfaces a2 and b2 of the lid cover remains connected without separation, allowing the Prukk PFC1 containing the section P1 to be maintained without scattering.

[0011] A second embodiment of this invention is shown in [Figure 2]. As shown in (F), the container body C and the lid CV are stacked and the pull hooks PFC2 and PFC3 are closed at two welded sections W2 at the corners of the flange, and creases BL2 and BL3 are shown at C1-C2 and d1-d2. In (G), the state in which the welded sections are released by lifting the pull hook PFC2 along the crease BL2 and the pull hook PFC3 along the crease BL3 with the fingers is shown, and the specific release method is shown in (H) as a cross section cut along the dashed line HA3 of the arc in (F), with a cut CL12 made in the film layer TF on the lower surface of the container body along d1-d2 and a cut CL13 made in the film layer TF on the upper surface of the container body along d1-d2, and further The cross-sectional structure is shown with cuts CL14 made in the film layer TF along d1 to d2 on the lower surface of the lid CV (however, the same applies to the pull hook PFC2, so the explanation is omitted here). As shown in (G), the cross-section cut along the dashed line HA4 of the arc is shown, and as shown in (I), the container body C and lid CV are separated by lifting the pull hook PFC2, including the welded part W2, upward by 90° along C1 to C2, and the separated state is shown in parts A2 and B2. (The same applies to pull hook PFC3, so it is omitted.) Furthermore, the ruptured partner pull hook is connected to the lid by the pulp layer TF, and the sections P2 and P3 can be opened while preventing scattering. (J) This shows the lid CV in a completely open state, and the sections P2 and P3 are fixed to the pull hooks PFC2 and PFC3 by the welded part W2, so contamination due to scattering can be prevented.

[0012] A third embodiment of this invention is shown in Figure 3. In (K), the container body C and the lid CV are joined together and closed at the welded joint W3, and perforations are made in the parts a3-a4, b3-b4, and a4-b4 surrounding the welded joint at intervals of several millimeters (approximately 2 mm) so as to penetrate vertically. In (L), the pull hook PFC4 is bent upward with the fingers, which shows the state in which the unperforated SPS sheet portion between the perforations MLD1 of the container body and MLU1 of the lid is torn open, and the section P4 remains fixed at the welded joint W3 so as not to scatter. In (N), the container body C and lid CV are stacked and the pull hooks PFC5 and PFC6, which are closed at the welded joints W4 at two corners of the flange, are positioned with a gap of approximately 2 mm between C3 and C4 and d3 and d4, and the container body perforations MLD2 and lid perforations MLU2 are passed through vertically, thereby providing a structure that preserves the container and prevents it from tearing during transport. Furthermore, as shown in (O), by bending the pull hooks PFC5 and PFC6 upward along their respective perforations with the fingers, the other pull hook, including the welded joint W4, is separated from the container body C and lid CV, and is opened in a state where it is connected to the lid CV by the film layer TF. (M) shows a structural diagram representing a cross-section cut along the dashed lines HA5 in (K) and HA7 in (H). (P) shows a cross-sectional diagram cut along the dashed lines HAC in (L) and HA8 in (O), showing that the pull hooks 4, 5, and 6, including the welded parts W3 and W4, are bent upward by 90°, and the container body C and lid CV are completely separated as shown in the separated state sections A3 and B3, where the unperforated PSP sheet portion between the perforations MLD1 and MLU1 and MLU2 of the container body is torn open, and the pull hooks PFC4, 5, and 6 are connected to the lid CV by the film layer TF and are not scattered when the opening is made. [Explanation of symbols] A1・A2・A3・B1・B2・B3: Separated state part BL1: Fold line between a2 and b2 BL2: Fold line between C1 and C2 BL3: Fold line between d1 and d2 C: Container body CV: Lid body CL1: Cuts made on the bottom surface of the container body between a1 and a2 CL2: Cuts made on the top surface of the container body between a1 and a2 CL3: Cuts made on the underside of the lid between a1 and a2 CL4: Cuts made on the upper surface of the lid between a1 and a2 CL5: Cuts made on the bottom surface of the container body between a2 and b2 CL6: Cuts made on the top surface of the container body between a2 and b2 CL7: Cuts made on the underside of the lid between a2 and b2 CL8: Cuts made on the bottom surface of the container body between b1 and b2 CL9: Cuts made on the top surface of the container body between b1 and b2 CL10: Cuts made on the underside of the lid between b1 and b2 CL11: Cuts made on the upper surface of the lid between b1 and b2 CL12: Cuts made on the bottom surface of the container body between C1 and C2 CL13: Cuts made on the top surface of the container body between C1 and C2 CL14: Cuts made on the underside of the lid between C1 and C2 F: Flange HA1・HA2・HA3・HA4・HA5・HA6・HA7・HA8: Chain line P1, P2, P3, P4, P5, P6: Intercept PFC1, PFC2, PFC3, PFC4, PFC5, PFC6: Pull hooks TF: thin film layer MLU1・MLU2: Perforations on the lid MLD1 / MLD2: Perforations on the container body W1・W2・W3・W4: Welded part

Claims

1. A container body made of vacuum-formed expanded polystyrene paper has a rectangular shape with a flange around the perimeter and can hold contents, and one side of the aforementioned has a folded portion that engages with the flange portion of the container body. A foamed polystyrene paper container characterized by forming a pull-flat opening on each of its slanted sides by making cut lines or perforations on each side.

2. By folding it in this way, the cross-section of the polystyrene paper splits along the cut line, The expanded polystyrene paper container according to claim 1, characterized in that it is capable of [something].

3. The expanded polystyrene paper container according to claim 1, characterized in that cuts are made in the polystyrene film layer above and below the slanted edge of the container body, including the attachment portion of the pull flap formed as the opening of the triangular portions at both ends, and similarly cuts are made below the slanted edge of the overlapping joint portion of the triangular portions at both ends of the lid, and by sequentially folding the pull flaps formed at both ends upward, the cross section of the polystyrene paper is split along the cuts and the container can be opened while attached to the polystyrene film layer of the lid which does not have cuts.

4. Wavy perforations are made that penetrate both vertically and horizontally, and when the fixed pull flap is folded upward, the cross-section of the container body and the lid is split and the perforations of the lid are also made. The expanded polystyrene paper container according to claim 1, characterized by the following:

5. The expanded polystyrene paper container according to claim 1, characterized in that wave-shaped perforations are made so as to overlap and penetrate the upper and lower sides of the slanted edges of the triangular parts of the container body and the slanted edges of the triangular parts of the lid, and by folding the fixed pull flap upward, the cross-sections of the container body and the lid are split, and the lid can be opened with the other pull flap attached, supported by the thin film layer with remaining perforations.

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