Willow leaf roof packing sheet

Abstract

The present invention provides a willow-leaf-shaped roof bag packaging sheet, comprising a substrate, the substrate comprising prefabricated indentations, the prefabricated indentations separating the substrate into a plurality of base surfaces, the base surfaces comprising an upper base surface and a first side base surface, a first prefabricated indentation being included between the upper base surface and the first side base surface, the base surfaces further comprising a second side base surface, a willow-leaf-shaped base surface formed by a second prefabricated indentation and a third prefabricated indentation being included between the first side base surface and the second side base surface, the second prefabricated indentation intersecting with the first prefabricated indentation at a first intersection, the third prefabricated indentation intersecting with the second prefabricated indentation at a second intersection, the spacing between the first intersection and the second intersection being ≥2 mm, through the above arrangement, on the one hand, the folding of each base surface is substantially unaffected, and on the other hand, the tip of the willow-leaf-shaped base surface is separated from the first prefabricated indentation, thereby avoiding the tip being damaged or the tip forming an extrusion effect on the folding position, resulting in wrinkles on the inside or delamination of the substrate.

Description

Technical Field

[0001] The invention belongs to the technical field of packaging boxes, and in particular relates to a willow-leaf-shaped roof bag packaging sheet. Background Art

[0002] Brick bags and roof bags are currently common packaging forms for liquid products such as milk and beverages. In order to further meet consumer demand and make these packages feel better to hold, products with packaging forms such as willow-leaf roof bags have been launched. For example, such product forms are given in documents such as CN107237216A.

[0003] The willow-leaf-shaped roof package has a willow-leaf-shaped side surface formed on the side of the box body. The willow-leaf side surface includes a pair of curved indentation lines. Usually, these two indentation lines extend to the bottom of the roof portion and intersect with at least three indentation lines that form the roof portion. It is found in practice that in this form, when the roof portion is bent, due to the inward squeezing of multiple side surfaces, especially the inward squeezing of the tip of the willow-leaf side surface, a bulge is formed on the inner side surface of the end of the willow-leaf side surface or the internal multi-layer structure is separated. Summary of the invention

[0004] To this end, the present invention provides a willow-leaf-shaped roof bag packaging sheet to solve the above technical problems.

[0005] A willow-leaf roof bag packaging sheet comprises a base for forming a packaging body, the packaging body comprises a roof portion and a side portion, the base comprises a plurality of prefabricated indentations, the prefabricated indentations separate the base into a plurality of base surfaces, the base surfaces comprise an upper base surface for forming the roof portion and a first side base surface for forming the side portion, a first prefabricated indentation is included between the upper base surface and the first side base surface, the base surface further comprises a second side base surface located on one side of the first side base surface, and a second prefabricated indentation is included between the first side base surface and the second side base surface. The indentation and the third prefabricated indentation are surrounded to form a willow-leaf-shaped base surface, the second prefabricated indentation and the third prefabricated indentation are both S-shaped, and the second prefabricated indentation extends to the first prefabricated indentation and intersects with the first prefabricated indentation at a first intersection, the third prefabricated indentation extends to the second prefabricated indentation and intersects with the second prefabricated indentation at a second intersection, the first intersection is separated from the second intersection, if the spacing between the first intersection and the second intersection is L, then L≥5mm, and the angle between the line between the first intersection and the second intersection and the first prefabricated indentation is 78°~85°.

[0006] Among them, L=8~20mm.

[0007] If the distance between the second intersection and the first prefabricated indentation is D, then D≥4mm.

[0008] If the first tangent is defined to pass through the second intersection and be tangent to the first prefabricated indentation, and the second tangent is defined to pass through the second intersection and be tangent to the second prefabricated indentation, and the angle between the first tangent and the second tangent is α, then α=7°~15°.

[0009] Among them, α=9°~12°.

[0010] Wherein, the upper base surface further includes a fourth prefabricated indentation extending from the first prefabricated indentation in a direction away from the first side base surface, the fourth prefabricated indentation is perpendicular to the first prefabricated indentation, and the fourth prefabricated indentation intersects with the first prefabricated indentation at a first intersection point.

[0011] The third tangent line is defined to pass through the first intersection point and be tangent to the second prefabricated indentation, and the angle between the third tangent line and the first prefabricated indentation is 75-85°.

[0012] Among them, the second prefabricated indentation and the third prefabricated indentation also include a third intersection, and the third intersection is located in the direction away from the first prefabricated indentation. At the same time, the distance between the second prefabricated indentation and the third prefabricated indentation gradually increases from the second intersection toward the third intersection and then gradually decreases.

[0013] Wherein, the prefabricated indentation has a depth of 0.1 to 1.2 mm.

[0014] There is a pair of willow-leaf-shaped base surfaces, and the pair of willow-leaf-shaped base surfaces are symmetrically arranged on both sides of the first side base surface.

[0015] Beneficial effect: The embodiment of the present invention provides a willow-leaf-shaped roof bag packaging sheet, including a base for forming a packaging body, the packaging body including a roof portion and a side portion, the base including a plurality of prefabricated indentations, the prefabricated indentations separating the base to form a plurality of base surfaces, the base surfaces including an upper base surface for forming the roof portion and a first side base surface for forming the side portion, a first prefabricated indentation between the upper base surface and the first side base surface, the base surface also including a second side base surface located on one side of the first side base surface, a willow-leaf-shaped base surface formed by a second prefabricated indentation and a third prefabricated indentation between the first side base surface and the second side base surface, the first prefabricated indentation The second prefabricated indentation and the third prefabricated indentation are both S-shaped, and the second prefabricated indentation extends to the first prefabricated indentation and intersects with the first prefabricated indentation at a first intersection, the third prefabricated indentation extends to the second prefabricated indentation and intersects with the second prefabricated indentation at a second intersection, the first intersection is separated from the second intersection, and if the spacing between the first intersection and the second intersection is L, then L≥5mm. Through the above arrangement, on the one hand, the folding of each base surface is basically unaffected, and on the other hand, the tip of the willow-leaf-shaped base surface is separated from the first prefabricated indentation, thereby avoiding damage to the tip or the tip forming an extrusion effect on the folding position, resulting in wrinkles on the inside or stratification of the base. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The willow-leaf-shaped roof bag packaging sheet provided by the embodiment of the present invention;

[0017] Figure 2 A packaging body formed by folding the willow-leaf roof bag packaging sheet;

[0018] Figure 3 for Figure 1 Enlarged schematic diagram of area A in the middle.

[0019] Component Description:

[0020] Base 10; first prefabricated indentation 101; second prefabricated indentation 102; third prefabricated indentation 103; first tangent line 104; second tangent line 105; upper base surface 11; fourth prefabricated indentation 111; first side base surface 12; second side base surface 13; willow-leaf-shaped base surface 14; packaging body 20; first intersection point 201; second intersection point 202; third intersection point 203; roof portion 21; side portion 22. DETAILED DESCRIPTION

[0021] Please refer to Figure 1 An embodiment of the present invention provides a willow-leaf roof bag packaging sheet, comprising a substrate 10, wherein the substrate 10 is used to form a packaging body 20 of the willow-leaf roof bag.

[0022] The packaging body 20 includes a roof portion 21 and a side portion 22. In the present embodiment, the roof portion 21 has an inclined top surface so that the entire roof portion 21 is in the shape of a column with a triangular cross-section, and the side portion 22 is in the shape of a rectangular column.

[0023] It can be understood that the substrate 10 is a sheet structure formed by stacking multiple layers of materials. Usually, the multiple layers of materials include a paper structure layer, an outer structure layer located outside the paper structure layer, and an inner structure layer located inside the paper structure layer.

[0024] The paper structure layer is used to provide stiffness for the packaging body 20. The paper structure layer can be natural paper, synthetic paper or mixed paper. The natural paper refers to paper formed by wet-laying natural fibers. The synthetic paper refers to paper formed by wet-laying synthetic fibers or dry-laying synthetic fibers or water-jet, needle-punch and other web-forming methods. The mixed paper refers to paper formed by wet-laying natural fibers and synthetic fibers or dry-laying synthetic fibers or water-jet, needle-punch and other web-forming methods. It can be understood that the natural fiber can be at least one of wood pulp fiber, bamboo fiber, grass pulp fiber, sugarcane pulp fiber and cotton pulp fiber.

[0025] In addition, the paper structure layer can be a multi-layer laminated structure, including 2 layers, 3 layers, or 4 layers containing fibers, and may also include a coating layer. In a specific embodiment, the paper layer includes a coating layer, a surface layer, a core layer and a bottom layer.

[0026] The paper layer has a thickness of 30-330 g / m 2 The basis weight of the paper layer is preferably greater than or equal to 150 g / m 2 , or greater than or equal to 177g / m 2 , or greater than or equal to 220g / m 2 , or greater than or equal to 300g / m 2 The bulk thickness of the paper layer is greater than or equal to 1.7 cm 3 / g, or greater than or equal to 1.9 cm 3 / g, or greater than or equal to 2.05 cm 3 / g.

[0027] The outer structural layer is used to provide a barrier to water, oxygen, etc. for the packaging body 20. Specifically, the outer structural layer includes a barrier layer mainly formed of polyethylene. In a specific embodiment, the outer structural layer includes a multi-layer structure, including an outer barrier layer, an inner barrier layer and a barrier coating located between the outer barrier layer and the inner barrier layer.

[0028] The barrier coating may be a metal or a metal oxide, or a coating with barrier properties. The upper layer is used to further block oxygen and water vapor. The barrier coating is used to block light.

[0029] When the barrier coating is a metal or a metal oxide, the metal may be copper, aluminum, titanium, or chromium, the oxide may be aluminum oxide, copper oxide, titanium oxide, or chromium oxide, the upper layer has a thickness of 100nm-500nm, and the adhesion between the barrier coating and the substrate 10 layers is 1N-10N / 15mm.

[0030] When the barrier coating is a coating, the specific coating may be PVA, EVOH, PPG, etc., and the coating thickness is in the range of 0.5-2 microns.

[0031] It can be understood that the outer barrier layer and the inner barrier layer can be polyethylene, polypropylene and other olefin resins including low-density polyethylene, linear low-density polyethylene, metallocene linear low-density polyethylene, high-density polyethylene, medium-density polyethylene, ethylene / vinyl acetate copolymer, ethylene / acrylic acid copolymer, ethylene / ethyl acrylate copolymer and other resins, and can also be used in appropriate combinations.

[0032] The inner structural layer is used to prevent the contents from penetrating into the packaging material, and at the same time provides an adhesive layer for transverse and longitudinal sealing to protect the product flavor and the integrity of the packaging material. The inner structural layer can be polyethylene, polypropylene and other olefin resins including low-density polyethylene, linear low-density polyethylene, metallocene linear low-density polyethylene, high-density polyethylene, medium-density polyethylene, ethylene / vinyl acetate copolymer, ethylene / acrylic acid copolymer, ethylene / ethyl acrylate copolymer and other resins, and can also be used in appropriate combinations.

[0033] In the above description, "polymer" refers to a polymeric compound prepared by polymerizing monomers of the same or different types. "Copolymer" refers to a polymer prepared by polymerization of at least two different types of monomers.

[0034] The base 10 includes a plurality of preformed indentations, which divide the base 10 into a plurality of base surfaces. The base surfaces are folded along the preformed indentations to form a receiving space for receiving liquid products. The preformed indentations are in the form of grooves on the surface of the base 10, so that a weakened area is formed in the area corresponding to the preformed indentations, so that the base surface can be easily folded along the preformed indentations, and during the folding process, wrinkles or delamination will not occur in the area corresponding to or adjacent to the preformed indentations.

[0035] It can be understood that the preformed indentation can be achieved by passing the willow-leaf roof bag packaging sheet through a pair of pressure rollers, wherein the pair of pressure rollers includes an upper pressure roller having a protrusion corresponding to the shape of the preformed indentation and a bottom roller arranged in a gap with the upper pressure roller. When the willow-leaf roof bag packaging sheet passes through the gap, the protrusion applies pressure on the corresponding area and forms a preformed indentation.

[0036] The base surface includes an upper base surface 11 for forming a roof portion 21 and a first side base surface 12 for forming a side portion 22, and a first prefabricated indentation 101 is included between the upper base surface 11 and the first side base surface 12. In the present embodiment, the upper base surface 11 and the first side base surface 12 are both rectangular, and the upper base surface 11 is bent at a certain angle along the first prefabricated indentation 101 to form the top surface of the roof portion 21. At the same time, the first prefabricated indentation 101 is straight. It can be understood that the first prefabricated indentation 101 is a side edge of the upper base surface 11, and at the same time, the first prefabricated indentation 101 is also a side edge of the first side base surface 12.

[0037] In addition, the upper base surface 11 further includes a fourth prefabricated indentation 111 extending from the first prefabricated indentation 101 away from the first side base surface 12 , and the fourth prefabricated indentation 111 forms another side edge of the upper base surface 11 , and the fourth prefabricated indentation 111 is perpendicular to the first prefabricated indentation 101 .

[0038] The base surface also includes a second side base surface 13 located on one side of the first side base surface 12, and a willow-leaf-shaped base surface 14 formed by a second prefabricated indentation 102 and a third prefabricated indentation 103 between the first side base surface 12 and the second side base surface 13. The second prefabricated indentation 102 and the third prefabricated indentation 103 are both S-shaped, and the second prefabricated indentation 102 extends to the first prefabricated indentation 101 and intersects with the first prefabricated indentation 101 at a first intersection 201, and the third prefabricated indentation 103 extends to the second prefabricated indentation 102 and intersects with the second prefabricated indentation 102 at a second intersection 202. The first intersection 201 is separated from the second intersection 202, and the distance between the first intersection 201 and the second intersection 202 is defined as L, that is, L≥5mm.

[0039] In addition, the angle between the line between the first intersection point 201 and the second intersection point 202 and the first prefabricated indentation 101 is 78° to 85°.

[0040] Furthermore, the fourth prefabricated indentation 111 extends and intersects with the first prefabricated indentation 101 at a first intersection 201 .

[0041] It is found in practice that when the first intersection 201 and the second intersection 202 are separated and L is greater than or equal to 5 mm, when the angle between the line between the first intersection 201 and the second intersection 202 and the first prefabricated indentation 101 is 78° to 85°, on the one hand, the folding of each base surface is basically unaffected, and on the other hand, the tip of the willow-leaf-shaped base surface 14 is separated from the first prefabricated indentation 101, and the second prefabricated indentation 102 located on the lower side can reduce the influence on the prefabricated indentation on the upper side, thereby avoiding damage to the tip or the extrusion effect of the tip on the folding position, resulting in wrinkles on the inside or stratification of the base 10. In further research, the above design scheme was adopted, and the situation of wrinkles or stratification at the tip was reduced by 12.8%.

[0042] Furthermore, L≤25 mm, so that the distance between the tip and the first intersection 201 is not too wide.

[0043] Furthermore, the L=8-20mm.

[0044] Furthermore, the second prefabricated indentation 102 and the third prefabricated indentation 103 also include a third intersection 203, and the third intersection 203 is located in the direction away from the first prefabricated indentation 101. At the same time, the distance between the second prefabricated indentation 102 and the third prefabricated indentation 103 gradually increases from the second intersection 202 to the third intersection 203 and then gradually decreases.

[0045] Furthermore, the distance between the second intersection 202 and the first prefabricated indentation 101 is D, and D is greater than or equal to 4 mm. The distance between the second intersection 202 and the first prefabricated indentation 101 is specifically, if a virtual straight line passes through the second intersection 202 and is parallel to the first prefabricated indentation 101, then D is the distance between the virtual straight line and the first prefabricated indentation 101.

[0046] Further, if the first tangent line 104 is defined to pass through the second intersection point 202 and be tangent to the first prefabricated indentation 101, and the second tangent line 105 is defined to pass through the second intersection point 202 and be tangent to the second prefabricated indentation 102, and the angle between the first tangent line 104 and the second tangent line 105 is α, then α=7°~15°.

[0047] Furthermore, the α=9°~12°.

[0048] Furthermore, a third tangent (not shown) is defined to pass through the first intersection 201 and be tangent to the second preformed indentation 102. The angle between the third tangent and the first preformed indentation 101 is 75-85°, that is, in this case, the second preformed indentation 102 is slightly inclined to the extension line of the fourth preformed indentation 111 at the portion connected to the first preformed indentation 101, so that no extrusion is formed on the inner side at the first intersection 201, and the tip can deviate from the position directly below the first intersection 201, and the tip will not be extruded during the bending process of the second side base 13 and the third side base, thereby forming a good tip and a good packaging shape.

[0049] Furthermore, the prefabricated indentation has a depth of 0.1 to 1.2 mm.

[0050] Furthermore, there is a pair of willow-leaf-shaped base surfaces 14 , and the pair of willow-leaf-shaped base surfaces 14 are symmetrically arranged on both sides of the first side base surface 12 .

[0051] The above description is only an implementation mode of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A willow-leaf roof bag packaging sheet, comprising a base for forming a packaging body, wherein the packaging body comprises a roof portion and a side portion, characterized in that: The base includes a plurality of prefabricated indentations, which separate the base into a plurality of base surfaces. The base surfaces include an upper base surface for forming a roof portion and a first side base surface for forming a side portion. A first prefabricated indentation is included between the upper base surface and the first side base surface. The base surface also includes a second side base surface located on one side of the first side base surface. A willow-leaf-shaped base surface formed by a second prefabricated indentation and a third prefabricated indentation is included between the first side base surface and the second side base surface. The second prefabricated indentation and the third prefabricated indentation are both S-shaped, and the second prefabricated indentation extends to the first prefabricated indentation and intersects with the first prefabricated indentation at a first intersection. The third prefabricated indentation extends to the second prefabricated indentation and intersects with the second prefabricated indentation at a second intersection. The first intersection is separated from the second intersection. If the spacing between the first intersection and the second intersection is L, then L≥5mm, and the angle between the line between the first intersection and the second intersection and the first prefabricated indentation is 78° to 85°.

2. The wicker roof bag packaging sheet according to claim 1, characterized in that: L=8~20mm.

3. The wicker roof bag packaging sheet according to claim 1, characterized in that: If the distance between the second intersection point and the first prefabricated indentation is D, then D≥4mm.

4. The wicker roof bag packaging sheet according to claim 1, characterized in that: If the first tangent is defined to pass through the second intersection and be tangent to the first prefabricated indentation, and the second tangent is defined to pass through the second intersection and be tangent to the second prefabricated indentation, and the angle between the first tangent and the second tangent is α, then α=7°~15°.

5. The wicker roof bag packaging sheet according to claim 4, characterized in that: α=9°～12°。 6. The lanceolate roof bag packaging sheet according to any one of claims 1 to 5, characterized in that: The upper base surface further includes a fourth prefabricated indentation extending from the first prefabricated indentation in a direction away from the first side base surface, the fourth prefabricated indentation is perpendicular to the first prefabricated indentation, and the fourth prefabricated indentation intersects with the first prefabricated indentation at a first intersection point.

7. The wicker roof bag packaging sheet according to claim 6, characterized in that: The third tangent line is defined to pass through the first intersection point and be tangent to the second prefabricated indentation, and the angle between the third tangent line and the first prefabricated indentation is 75-85°.

8. The wicker roof bag packaging sheet according to claim 6, characterized in that: The second prefabricated indentation and the third prefabricated indentation also include a third intersection, and the third intersection is located in the direction away from the first prefabricated indentation. At the same time, the distance between the second prefabricated indentation and the third prefabricated indentation gradually increases from the second intersection to the third intersection and then gradually decreases.

9. The wicker roof bag packaging sheet according to claim 8, characterized in that: The prefabricated indentation has a depth of 0.1 to 1.2 mm.

10. The wicker roof bag packaging sheet according to claim 1, characterized in that: There is a pair of willow-leaf-shaped base surfaces, and the pair of willow-leaf-shaped base surfaces are symmetrically arranged on both sides of the first side base surface.

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