Acid-resistant oil-resistant leakage-proof paper box and preparation process thereof

Abstract

The invention relates to the technical field of paper containers, in particular to an acid-resistant oil-resistant leakproof paper box and a preparation process thereof, and mainly solves the problem of poor leakproof performance of a paper box in the prior art. The acid-resistant oil-resistant leakproof paper box comprises a paper box body, the paper box body comprises a box body and a box bottom, and the box body comprises a paper wall of a sheet structure; a first folding part which is folded outwards is arranged on one side of the paper wall in the transverse direction, a second folding part which is folded inwards is arranged on the other side of the paper wall in the transverse direction, the first folding part and the second folding part are connected in a hooking mode, and the box body forms an annular structure which is connected end to end through hot pressing connection of the first folding part and the second folding part. The paper wall comprises a paper sheet, a first lamination layer arranged on one side face of the paper sheet and a second lamination layer arranged on the other side face of the paper sheet, the box bottom is arranged on the lower portion of the box body, the box body and the box bottom define a containing cavity which is provided with an upward opening and used for containing liquid, and the upper edge of the box body is provided with a flat edge extending outwards.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of paper containers, in particular to an acid-resistant and oil-resistant leak-proof paper box and a preparation process thereof. BACKGROUND

[0002] Paper containers such as paper boxes and paper cups are convenient to use and are used to hold liquids such as water, coffee, milk, yogurt, and materials such as instant noodles and instant powder that need to be mixed with liquids or brewed. Paper containers such as paper boxes and paper cups have the advantages of low cost, portability, and safety compared to glass cups, and paper cups have the advantages of high temperature resistance and no pollution compared to plastic cups. Therefore, paper containers have a very wide range of applications.

[0003] Paper cups and paper boxes have similar structures. For example, a paper cup disclosed in Chinese Patent Application No. 201720201523.1 includes a cup body and a cup bottom. The cup body has a cup outer folding upper edge. The cup body side wall is formed by connecting single paper walls end to end. The paper cup is connected end to end to form a cup body joint. The edge of the cup bottom is bent downward to form an edge lower folding area. The edge lower folding area is wrapped by an inner folding area of the cup body side wall bottom and adhered to each other to form a cavity with an opening upward. A tight pressing line is provided outside the inner folding area to increase the bonding strength of the cup bottom and the cup body side wall. The upper edge is provided to keep the human lip away from the cup body directly contacting the liquid when drinking, preventing burns to the lips during pouring.

[0004] However, the cup body of the paper cup is formed by connecting the ends to form a joint. In the bonding process, the ends need to reserve an area for applying glue and adhering to each other. After bonding, the joint on the inner surface of the cup body is in a stepped shape. When holding yogurt or greasy substances for a long time, the two layers of paper walls between the joint may seep out, causing leakage. SUMMARY

[0005] Therefore, to solve the above problems, the present application provides an acid-resistant and oil-resistant leak-proof paper box and a preparation process thereof, which mainly solves the problem of poor leak-proofness of the paper box in the prior art.

[0006] To achieve the above object, the present application adopts the following technical scheme: An acid-resistant and oil-resistant leak-proof paper box, comprising a paper box body, the paper box body comprising a box body and a box bottom, the box body comprising a sheet structure paper wall, defining a transverse direction extending along the length direction of the paper wall and a longitudinal direction extending along the width direction of the paper wall, a first folding part being outwardly folded on one side of the paper wall in the transverse direction, a second folding part being inwardly folded on the other side of the paper wall in the transverse direction, the first folding part and the second folding part being hook-connected, and being heat-press connected through the first folding part and the second folding part, so that the box body forms a ring structure connected at the head and tail, the paper wall comprising a paper sheet, a first coating layer arranged on one side of the paper sheet, and a second coating layer arranged on the other side of the paper sheet, the box bottom being arranged at the lower part of the box body, a lower bending part being formed by bending the peripheral edge of the box bottom downward, the lower bending part being wrapped by an inner bending part of the lower edge of the box body and being heat-press connected, the box body and the box bottom surrounding a cavity with an opening upward for containing liquid, and the upper edge of the box body being provided with a flat edge extending outward.

[0007] Further, the paper wall has a first arc-shaped edge and a second arc-shaped edge distributed in the transverse direction, and a first straight edge and a second straight edge distributed in the longitudinal direction.

[0008] Further, an inclined edge is arranged at the connection between the first arc-shaped edge and the first straight edge.

[0009] Further, a notch in a right-angle structure is arranged at the connection between the second arc-shaped edge and the second straight edge.

[0010] Further, the included angle between the box body and the central axis thereof is 0°-20°.

[0011] Further, the paper box body is in a square structure or a circular structure.

[0012] A preparation process of an acid-resistant and oil-resistant leak-proof paper box, used for preparing the paper box body of claim 1, comprising the following steps:

[0013] 1) cutting out the paper wall and the box bottom from the material with the first coating layer and the second coating layer respectively;

[0014] 2) outwardly folding the first folding part on one side of the paper wall in the transverse direction, and inwardly folding the second folding part on the other side of the paper wall in the transverse direction;

[0015] 3) hooking the first folding part and the second folding part, and then heat-pressing them, so that the first coating layer and the second coating layer are mixed in a molten state and are fixedly connected after cooling, forming the box body;

[0016] 4) heat-press connecting the box bottom with the lower part of the box body;

[0017] 5) the upper edge of the box is rolled outward, and the rolled edge is flattened and set.

[0018] By adopting the technical scheme, the acid-resistant and oil-resistant leak-proof paper box and the preparation process thereof have the advantages that: the box body is formed by winding and composite connecting a sheet structure paper wall, thereby reducing the number of composite connection areas on the box body; the first folding part on one side of the paper wall in the transverse direction is hook-connected with the second folding part on the other side of the paper wall in the transverse direction, and the first folding part and the second folding part are hot-pressed and connected, so that the box body forms a ring structure with a head-to-tail connection, thereby improving the leak-proof effect of the composite connection area; meanwhile, the first coating layer and the second coating layer are arranged on the two sides of the paper sheet of the paper wall, respectively, and the first coating layer and the second coating layer are mixed after being in a molten state during hot-pressing and connection and are fixedly connected after cooling, so that the adjacent two layers of paper walls at the composite connection area are integrated, the generation of gaps is prevented, the paper box can store yogurt and other acidic substances or oily substances with high oil content for a long time, and the acid-resistant and oil-resistant effects are achieved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a perspective structural schematic view of the embodiment one of the present application;

[0020] Figure 2 is a sectional structural schematic view of the paper box body along a horizontal plane in the embodiment one of the present application;

[0021] Figure 3 is a sectional structural schematic view of the paper box body along a vertical plane in the embodiment one of the present application; Figure 2

[0022] is a sectional structural schematic view of the paper box body along a vertical plane in the embodiment one of the present application; Figure 4

[0023] is a sectional structural schematic view of the paper box body along a vertical plane in the embodiment one of the present application; Figure 5 Figure 4 is a sectional structural schematic view of the paper box body along a vertical plane in the embodiment one of the present application;

[0024] Figure 6

[0025] Figure 7 is a perspective structural schematic view of the embodiment two of the present application. DETAILED DESCRIPTION

[0026] The present application will be further described in combination with the drawings and specific embodiments.

[0027] The embodiment of the present application is:

[0028] Embodiment one:

[0029] Reference Figures 1 to 6 ​​As shown, an acid and oil resistant leak-proof paper box comprises a paper box body 1, in this embodiment, the paper box body 1 is a circular structure, the paper box body 1 comprises a box body 11 and a box bottom 12, the box body 11 comprises a sheet structure paper wall 2, defining the length direction of the paper wall 2 as the transverse direction, the width direction as the longitudinal direction, the transverse direction one side of the paper wall 2 is provided with a first folding part 3 folded outward, the transverse direction other side of the paper wall 2 is provided with a second folding part 4 folded inward, the first folding part 3 and the second folding part 4 are hooking connected, and through the hot pressing connection of the first folding part 3 and the second folding part 4, the box body 11 forms a ring structure connected head to tail, the paper wall 2 comprises a paper sheet 21, a first coating layer 22 provided on one side of the paper sheet 21, and a second coating layer 23 provided on the other side of the paper sheet 21, the box bottom 12 is provided at the lower part of the box body 11, the circumferential edge of the box bottom 12 extends downward and bends to form a lower bending part 5, the lower bending part 5 is wrapped by an inner bending part 6 of the lower edge of the box body 11 and is hot-pressed and connected, the box body 11 and the box bottom 12 form a container cavity 13 with an opening upward for containing liquid, the upper edge of the box body 11 is provided with a flat edge 7 extending outward.

[0030] The acid and oil resistant leak-proof paper box, through the sheet structure paper wall 2 winding and composite connection to form the box body 11, thereby reducing the number of composite connection areas a on the box body 11, and the composite connection areas a are hooking connected by the first folding part 3 on the transverse direction one side of the paper wall 2 and the second folding part 4 on the transverse direction other side of the paper wall 2, and through the hot pressing connection of the first folding part 3 and the second folding part 4, the box body 11 forms a ring structure connected head to tail, thereby improving the leak-proof effect of the composite connection areas a, and through the first coating layer 22 and the second coating layer 23 respectively provided on the two sides of the paper sheet 21 of the paper wall 2, the first coating layer 21 and the second coating layer 22 are mixed after forming a molten state during hot pressing and are fixedly connected after cooling, so that the adjacent two layers of the paper wall 2 at the composite connection areas a form an integral, preventing the generation of gaps, and being able to store yogurt and other acidic substances or oily substances for a long time, thereby playing an acid and oil resistant role.

[0031] Further, the paper wall 2 has a first arc-shaped edge 201 and a second arc-shaped edge 202 distributed along the transverse direction, and a first straight edge 203 and a second straight edge 204 distributed along the longitudinal direction, and an inclined edge 205 is arranged at the connection position of the first arc-shaped edge 204 and the first straight edge 203, and a straight-angled notch 206 is arranged at the connection position of the second arc-shaped edge 202 and the second straight edge 204, so that after the flat edge 7 at the composite connection area a of the box body 11 is rolled and flattened and fixed, the thickness of the composite connection area a is reduced, the upper surface of the flat edge 7 is flat, the local protrusion is avoided, and when the box cover is closed, the box cover can be in sufficient contact with the box body 11, the sealing performance of the box cover and the box body 1 is improved, and the flatness of the inner side wall of the box body 11 is ensured, and the composite sealing performance with the box bottom 12 is improved.

[0032] Further, the angle between the box body 11 and the axis is 0°-20°, and preferably 6°, so that the upper edge of the box body 11 can be outwardly supported, and when the box cover is closed, the flat edge 7 of the upper edge of the box body 11 is clamped by the box cover, and the sealing performance between the box cover and the box body 11 is further improved, and the box body 11 is beneficial to demolding after being manufactured.

[0033] A preparation process of an acid-resistant and oil-resistant leak-proof paper box, which is used for preparing the paper box body 1 in claim 1 and comprises the following steps.

[0034] 1) cutting the paper wall 2 and the box bottom 12 from the material with a first coating layer 22 and a second coating layer 23 respectively;

[0035] 2) outwardly folding the first folding part 3 of the paper wall 2 along the transverse direction, and inwardly folding the second folding part 4 of the paper wall 2 along the transverse direction;

[0036] 3) hooking and hot-pressing the first folding part 3 and the second folding part 4, so that the first coating layer 22 and the second coating layer 23 are mixed in a molten state and are fixedly connected after cooling to form the box body 11;

[0037] 4) hot-pressing and connecting the box bottom 12 and the lower part of the box body 11;

[0038] 5) outwardly rolling the upper edge of the box body 11, and then flattening and fixing the rolled edge.

[0039] The preparation process of the acid-resistant and oil-resistant leak-proof paper box can prepare a paper box body with good leak-proof effect, acid resistance and oil resistance, and has simple process and high production efficiency.

[0040] Example 2

[0041] Reference Figure 7As shown, the second embodiment is consistent with the design idea of the first embodiment, and is characterized in that the paper box body 1 is a square structure.

[0042] In addition, the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" are used only for descriptive purposes and are not to be construed as indicating or implying relative importance or a specific number of the technical features indicated. Therefore, the features defined with "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0043] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0044] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0045] Although the present application is specifically shown and introduced in combination with the preferred embodiments, those skilled in the art should understand that various changes in form and details can be made to the present application without departing from the spirit and scope of the present application defined by the appended claims, and all such changes are within the protection scope of the present application.

Claims

1. An acid- and oil-resistant leak-proof cardboard box, characterized in that: The box includes a cardboard box body, which comprises a box body and a box bottom. The box body includes a sheet-like paper wall, defined as extending laterally along its length and longitudinally along its width. One side of the paper wall in the lateral direction has an outwardly folded first fold, and the other side of the paper wall in the lateral direction has an inwardly folded second fold. The first and second folds are hooked together and connected by heat-pressing, forming a ring-shaped structure with the box body connected end to end. The paper wall includes a paper sheet, a first coating layer on one side of the paper sheet, and a second coating layer on the other side of the paper sheet. The box bottom is located at the lower part of the box body. The periphery of the box bottom extends downward and bends to form a lower bend. The lower bend is wrapped by an inwardly bend of the lower edge of the box body and heat-pressed together. The box body and the box bottom form an upward-opening cavity for holding liquid. The upper edge of the box body has an outwardly extending flat edge.

2. The acid- and oil-resistant leak-proof cardboard box according to claim 1, characterized in that: The paper wall has a first arc-shaped edge and a second arc-shaped edge distributed in the transverse direction, and a first straight edge and a second straight edge distributed in the longitudinal direction.

3. The acid- and oil-resistant leak-proof cardboard box according to claim 2, characterized in that: An inclined edge is provided at the connection between the first arc-shaped edge and the first straight edge.

4. The acid- and oil-resistant leak-proof cardboard box according to claim 2 or 3, characterized in that: A right-angled notch is provided at the junction of the second arc-shaped side and the second straight side.

5. The acid- and oil-resistant leak-proof cardboard box according to claim 1, characterized in that: The angle between the box body and its central axis is 0° to 20°.

6. The acid- and oil-resistant leak-proof cardboard box according to claim 1, characterized in that: The cardboard box body has a square or circular structure.

7. A process for preparing an acid- and oil-resistant leak-proof paper box, used for preparing the paper box body as described in claim 1, characterized in that: Includes the following steps: 1) Cut out the paper walls and box bottom from the material having the first coating layer and the second coating layer respectively; 2) Fold one side of the paper wall outward in the transverse direction to form the first fold, and fold the other side of the paper wall inward in the transverse direction to form the second fold; 3) Hook the first fold and the second fold together, then heat press them together so that the first coating layer and the second coating layer are molten and mixed, and then fixedly connected after cooling to form a box body; 4) Heat-press the bottom of the box to the lower part of the box body; 5) Roll the top edge of the box outwards, and then flatten and shape the rolled edge.

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