Container precursor
Patent Information
- Application Number
- EP2023905817
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2022-12-19
- Filing Date
- 2023-12-15
- Publication Date
- 2025-10-29
Smart Images

Figure 1.1
Abstract
Description
CONTAINER PRECURSOR
[0001] CROSS-REFERENCE OF RELATED APPLICATION
[0002] For all the purposes, the present invention claims priority to Chinese patent application No. 202211635494.1, filed on December 19, 2022, the entire disclosure of which is incorporated herein by reference as part of the present invention.TECHNICAL FIELD
[0003] The present invention relates to the technical field of packaging, in particular to a container precursor.BACKGROUND
[0004] For a long time, many foodstuffs have been preserved in sealed jars and glassware. Under such circumstance, firstly, it is necessary to sterilize the jars and glassware thoroughly, then put the foodstuffs into the jars and glassware and seal the jars and glassware to extend a shelf life of the foodstuffs. However, since product information, promotion information or the like cannot be directly printed on surfaces of the jars and glassware, it is required to use packaging materials suitable for printing (such as packaging materials made of paper) to fabricate sealed containers to package and seal the foodstuffs for preservation.SUMMARY
[0005] At least one embodiment of the present invention provides a container precursor, with the objective of improving the quality of the container precursor.
[0006] At least one embodiment of the present invention provides a container precursor, the container precursor comprises:
[0007] a container precursor wall, the container precursor wall is composed of a package sheet enclosing an internal area, the package sheet comprises an inner cover layer, a barrier layer and a carrier layer which are stacked sequentially in a direction away from the internal area;
[0008] the container precursor wall comprises a longitudinal seam formed by joining two ends of the package sheet;
[0009] the container precursor wall has a first tensile strength and a first elongation at break in a first direction, and a second tensile strength and a second elongation at break in a second direction, the first direction is a longitudinal direction along which the longitudinal seam extends, and the second direction is a circumferential direction of the container precursor wall which is perpendicular to the longitudinal direction, and the first tensile strength is smaller than the second tensile strength, and the first elongation at break is greater than the second elongation at break.
[0010] In some embodiments, in the container precursor provided by at least one embodiment of the present invention, a ratio of the first tensile strength to the second tensile strength is in a range of 0.5-1, and a ratio of the first elongation at break to the second elongation at break is in a range of 1.5-3.
[0011] In some embodiments, in the container precursor provided by at least one embodiment of the present invention, the inner cover layer has a third tensile strength and a third elongation at break in the first direction, and the inner cover layer has a fourth tensile strength and a fourth elongation at break in the second direction, the third tensile strength is smaller than the fourth tensile strength, and the third elongation at break is greater than the fourth elongation at break.
[0012] In some embodiments, in the container precursor provided by at least one embodiment of the present invention, a ratio of the third tensile strength to the fourth tensile strength is in a range of 0.6-1, and a ratio of the third elongation at break to the fourth elongation at break is in a range of 1-2.
[0013] In some embodiments, in the container precursor provided by at least one embodiment of the present invention, a material of the carrier layer comprises fiber.
[0014] In some embodiments, in the container precursor provided by at least one embodiment of the present invention, the barrier layer comprises a base layer, a reinforcement layer and a protection layer which are arranged in a stacked manner; the base layer is arranged adjacent to the inner cover layer, and the protection layer is arranged adjacent to the carrier layer.
[0015] In some embodiments, in the container precursor provided by at least one embodiment of the present invention, the barrier layer further comprises a first inorganic oxide layer between the base layer and the inner cover layer, and / or, a second inorganic oxide layer between the protection layer and the carrier layer.
[0016] In some embodiments, in the container precursor provided by at least one embodiment of the present invention, the reinforcement layer comprises at least one selected from a group consisting of an aluminum oxide layer, a silicon oxide layer and a silicon oxycarbide layer, and the package sheet further comprises a light-shielding layer between the barrier layer and the carrier layer.
[0017] In some embodiments, in the container precursor provided by at least one embodiment of the present invention, the package sheet further comprises a first adhesive layer between the light-shielding layer and the barrier layer, and a second adhesive layer between the barrier layer and the inner cover layer.
[0018] In some embodiments, in the container precursor provided by at least one embodiment of the present invention, the package sheet further comprises an outer cover layer at a side of the carrier layer away from the inner cover layer.
[0019] The present invention achieves the following beneficial effects.
[0020] The container precursor provided by the embodiments of the present invention includes a container precursor wall, and the container precursor wall is composed of a package sheet enclosing an internal area. The package sheet includes an inner cover layer, a barrier layer, and a carrier layer, which are sequentially stacked in a direction away from the internal area; the container precursor wall includes a longitudinal seam formed by joining two ends of the package sheet; the container precursor wall has a first tensile strength and a first elongation at break in a first direction, and has a second tensile strength and a second elongation at break in a second direction; the first direction is a longitudinal direction along which the longitudinal seam extends, and the second direction is a circumferential direction of the container precursor wall and is perpendicular to the longitudinal direction; the first tensile strength is smaller than the second tensile strength, and the first elongation at break is greater than the second elongation at break. A machine direction (also referred to as a stretching direction) of the package sheet in a production process thereof is defined as the second direction. By means of setting the second tensile strength of the container precursor wall composed of the package sheet in the second direction to be greater than the first tensile strength of the container precursor wall in the first direction, and setting the second elongation at break of the container precursor wall composed of the package sheet in the second direction to be smaller than the first elongation at break of the container precursor wall in the first direction, the risk of breaking the package sheet by stretching in the production process thereof can be effectively reduced, and the container precursor fabricated by using the package sheet as well as a sealed container obtained by folding the container precursor are not easy to be deformed. In this way, the quality of the container precursor is improved.BRIEF DESCRIPTION OF THE DRAWINGS
[0021] FIG. 1 is a schematic diagram illustrating an unfolded state of a container precursor provided by an embodiment of the present invention;
[0022] FIG. 2 is a schematic structural diagram of a container precursor provided by an embodiment of the present invention;
[0023] FIG. 3 is a schematic diagram illustrating a tensile strength of a package sheet provided by an embodiment of the present invention;
[0024] FIG. 4 is a schematic diagram illustrating an elongation at break of a package sheet provided by an embodiment of the present invention;
[0025] FIG. 5 is a schematic structural diagram of a package sheet provided by an embodiment of the present invention;
[0026] FIG. 6 is another schematic structural diagram of a package sheet provided by an embodiment of the present invention;
[0027] FIG. 7 is another schematic structural diagram of a package sheet provided by an embodiment of the present invention;
[0028] FIG. 8 is another schematic structural diagram of a package sheet provided by an embodiment of the present invention;
[0029] FIG. 9 is another schematic structural diagram of a package sheet provided by an embodiment of the present invention;
[0030] FIG. 10 is a schematic diagram illustrating a tensile strength of an inner cover layer provided by an embodiment of the present invention;
[0031] FIG. 11 is a schematic diagram illustrating an elongation at break of an inner cover layer provided by an embodiment of the present invention;
[0032] FIG. 12 is a schematic structural diagram of a sealed container provided by an embodiment of the present invention;
[0033] FIG. 13 is another schematic structural diagram of a sealed container provided by an embodiment of the present invention;
[0034] FIG. 14 is yet another schematic structural diagram of a sealed container provided by an embodiment of the present invention;
[0035] FIG. 15 is a schematic cross-sectional view of FIG. 14;
[0036] FIG. 16 is a photograph of an end opening of a sealed container provided by an embodiment of the present invention;
[0037] FIG. 17 is a schematic planar view of a package sheet provided by an embodiment of the present invention;
[0038] FIG. 18 is another schematic structural diagram of a sealed container provided by an embodiment of the present invention;
[0039] FIG. 19 is a photograph of an end opening of a container precursor obtained by folding a package sheet provided by an embodiment of the present invention;
[0040] FIG. 20 is a photograph of an end opening of a container precursor obtained by folding a package sheet provided by another embodiment of the present invention;
[0041] FIG. 21 and FIG. 22 are photographs of the sealed containers respectively illustrated in FIG. 19 and FIG. 20 in an activation position;
[0042] FIG. 23 is a comparison diagram illustrating test results of a sealed container under different spacing values provided by an embodiment of the present invention;
[0043] FIG. 24 is a schematic cross-sectional view taken along a direction of a plane where a bottom surface of the sealed container of FIG. 18 is located; and
[0044] FIG. 25 is a schematic structural diagram of a container precursor in a flat state provided by an embodiment of the present invention.DETAILED DESCRIPTION
[0045] In order to make objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be described below in a clearly and fully understandable way in connection with the drawings related to the embodiments of the present invention. It should be noted that the dimensions and shapes of the figures in the accompanying drawings are not intended to reflect the true scales, but only to schematically illustrate the contents of the present invention. Furthermore, the same or similar reference numerals indicate the same or similar elements, or elements with the same or similar functions throughout. In order to keep the following description of the embodiments of the present invention clear and concise, detailed descriptions of known functions and known components are omitted in the present invention.
[0046] Unless otherwise defined, technical terms or scientific terms used herein shall have their general meanings as understood by one of ordinary skill in the art to which the present invention belongs. The words "first" , "second" , and the similar words, that are used in the specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. The words "including" or "containing" , and the similar words are intended to specify that the elements or the objects stated before these terms encompass the elements or the objects and equivalents thereof listed after these terms, but do not preclude the other elements or objects. “Inner” , “outer” , “above” , “under” and the like are only used to indicate relative position relationship, and when the position of the object as described is changed, the relative position relationship may be changed accordingly.
[0047] FIG. 1 is a schematic diagram illustrating an unfolded state of a container precursor, and FIG. 2 is a schematic structural diagram of the container precursor. As can be seen from FIG. 1, the container precursor includes a container precursor wall composed of a package sheet 001. The package sheet 001 is in an unfolded state and has crease lines. For simplicity, FIG. 1 only illustrates the main crease lines. For example, these crease lines include a plurality of longitudinal crease lines extending in a first direction Y and two transverse crease lines extending in a second direction X, and the first direction Y is perpendicular to the second direction X. After a first end A of the package sheet 001 and a second end B of the package sheet 001 are sealed into a longitudinal seam J extending along the first direction Y, the container precursor illustrated in FIG. 2 is obtained.
[0048] In the related art, a large-sized package sheet is prepared firstly, and then the large-sized package sheet is cut into a target-sized package sheet, so as to produce a container precursor using the target-sized package sheet. In the production process of the container precursor, a machine direction (also referred to as a stretching direction) of the package sheet among different rollers is perpendicular to the extending direction (i.e., the first direction Y) of the longitudinal seam J. In other words, the machine direction of the package sheet in the production process is the second direction X, which results in that the package sheet is subjected to a greater stretching force in the second direction X in the production process and is easier to be damaged, which further affects the quality of a container precursor and a packaging container produced by using the package sheet.
[0049] In order to solve the above technical problems in the related art, embodiments of the present invention provide a container precursor. As illustrated in FIG. 1 to FIG. 9, the container precursor includes:
[0050] a container precursor wall, the container precursor wall is composed of a package sheet 001 enclosing an internal area ZOI; the package sheet 001 includes an inner cover layer 101, a barrier layer 102 and a carrier layer 103 which are sequentially stacked in a direction away from the internal area ZOI;
[0051] the inner cover layer 101 is configured to prevent from a leakage of fluid food in a sealed container; optionally, the inner cover layer 101 may include at least one (e.g., more than two) inner cover layer polymer, and the inner cover layer polymer is a polyolefin material; by way of example, the polyolefin material is one selected from the group consisting of high-density polyolefin, low-density polyolefin and metallocene polyolefin; preferably, the polyolefin material is polyethylene, for example, the polyethylene is one selected from the group consisting of high-density polyethylene, low-density polyethylene and metallocene polyethylene (mPE) ; the metallocene polyethylene includes linear low-density polyethylene (LLDPE) and very low-density polyethylene (VLDPE) ;
[0052] the barrier layer 102 may have at least one selected from the group consisting of light barrier function, water barrier funciton and oxygen barrier function; a material of the barrier layer 102 may include at least one selected from the group consisting of an aluminum foil (Al) , an iron foil (Fe) , a copper foil (Cu) , an aluminum oxide layer (Al2O3) , a magnesium oxide layer (MgO) , a titanium oxide layer (TiO2) , a zirconium oxide layer (ZrO2) , a tin oxide layer (SnO, Sn2O3, SnO2) , a zinc oxide layer (ZnO) , an indium oxide layer (InO, In2O3, InO2) , an indium tin oxide (ITO) , a zinc stannate layer (Zn2SnO4) , a silicon oxide layer (SiOy) , a silicon nitride layer (Si3N4) , a silicon oxynitride layer (SiON) , a silicon carbide (SiC) layer, a silicon oxycarbide layer (SiqOmCn, where q is valued in a range of 15-30, m is valued in a range of 25-60, and n is valued in a range of 15-50) , an organic silicon compound layer (e.g., tetramethoxysilane Si (OCH3) 4, tetraethoxysilane Si (OC2H5) 4, tetrapropoxysilane Si (OC3H7) 4, tetrabutoxysilane Si (OC4H9) 4 and other siloxanes) , a vinyl polymer layer, a polyacrylic acid layer and the like; optionally, the vinyl polymer layer is of polyvinylidene chloride (PVdC) and / or polyvinyl alcohol (PVOH) ;
[0053] the carrier layer 103 has a sufficient strength and rigidity to ensure that the sealed container produced by using the package sheet including the carrier layer 103 has a sufficient stability and ensure that the sealed container in a filled state can basically maintains its shape; optionally, the carrier layer 103 is one or any combination selected from the group consisting of a hard paperboard, a paperboard and a paper; in some embodiments, the carrier layer 103 can also be configured for printing various patterns, characters and the like thereon;
[0054] the container precursor wall includes a longitudinal seam J formed by joining two ends (e.g., a first end A and a second end B) of the package sheet 001;
[0055] the container precursor wall has a first tensile strength in the first direction Y and a first elongation at break in the first direction Y; the container precursor wall has a second tensile strength in the second direction X and a second elongation at break in the second direction X; the first direction Y is a longitudinal direction along which the longitudinal seam J extends, and the second direction X is a circumferential direction of the container precursor wall and is perpendicular to the longitudinal direction; the first tensile strength is smaller than the second tensile strength, and the first elongation at break is greater than the second elongation at break.
[0056] In the container precursor provided by the embodiments of the present invention, by setting the second tensile strength of the container precursor wall composed of the package sheet 001 in the second direction X to be greater than the first tensile strength of the container precursor wall in the first direction Y, and setting the second elongation at break of the container precursor wall composed of the package sheet 001 in the second direction X to be smaller than the first elongation at break of the container precursor wall in the first direction Y, the risk of breaking the package sheet 001 by stretching in the production process can be effectively reduced, and both the container precursor fabricated from the package sheet and the sealed container obtained by folding the container precursor are not easy to be deformed. In this way, the quality of the container precursor can be improved.
[0057] In some embodiments, according to the present invention, a tensiometer with model number of TIRA 28025 is adopted to measure the first elongation at break and the first tensile strength of the package sheet 001 in the first direction Y, and the second elongation at break and the second tensile strength of the package sheet 001 in the second direction X. First of all, a package sheet 001 with a length of 180 mm in the first direction Y and a width of 15 mm in the second direction X can be obtained as a longitudinal (MD) sample, and a package sheet 001 with a length of 180 mm in the second direction X and a width of 15 mm in the first direction Y can be obtained as a transverse (CD) sample, by cutting with a tool such as scissors and the like. Subsequently, the longitudinal (MD) sample and the transverse (CD) sample are placed under a standard climatic condition (with a temparature of 23℃±1℃ and a relative humidity of 50%±5%) for 24 hours, and then a test is started. Optionally, a test tensile force is 500 N, a test speed is 100 mm / min, a test spacing of the transverse (CD) samples is 100 mm, and a test spacing of the longitudinal (MD) samples is 40 mm, with a test ending condition that an upper limit of the sensor is reached or that a force value is reduced by 50%.
[0058] In some embodiments, in the above-described container precursor provided by the embodiments of the present invention, in order to obtain a package with well-defined edges and corners, a ratio of the first tensile strength to the second tensile strength may be in a range of 0.5-1, and a ratio of the first elongation at break to the second elongation at break may be in a range of 1.5-3. By way of example, the ratio of the first tensile strength to the second tensile strength is about 0.6, correspondingly, the first tensile strength is 28.6429 MPa and the second tensile strength is 48.4533 MPa; the ratio of the first elongation at break to the second elongation at break is about 1.8, correspondingly, the first elongation at break is 8.22761%and the second elongation at break is 4.58962%. In some embodiments, the ratio of the first tensile strength to the second tensile strength may also be 0.5, 0.7, 0.8, 0.9, 1, etc., and the ratio of the first elongation at break to the second elongation at break may also be 1.5, 2, 2.5, 3, etc.
[0059] Because the inner cover layer 101 is configured to prevent from a leakage of fluid food in the sealed container, especially to reduce a bottom leakage during transportation of the sealed container, the integrity of the inner cover layer 101 is particularly important. Based on this, in order to reduce the risk of breakage such as fracture of the inner cover layer 101 during the production of the package sheet 001, as illustrated in FIG. 10 and FIG. 11, in the present invention, the inner cover layer 101 may be configured to have a third tensile strength in the first direction Y and a third elongation at break in the first direction Y, and have a fourth tensile strength in the second direction X and a fourth elongation at break in the second direction X, the third tensile strength is smaller than the fourth tensile strength, and the third elongation at break is greater than the fourth elongation at break. In some embodiments, a ratio of the third tensile strength to the fourth tensile strength is in a range of 0.6-1, and a ratio of the third elongation at break to the fourth elongation at break is in a range of 1-2. By way of example, the ratio of the third tensile strength to the fourth tensile strength is about 0.7, correspondingly, the third tensile strength is 13.6995 MPa and the fourth tensile strength is 19.415 MPa; the ratio of the third elongation at break to the fourth elongation at break is about 1.1, correspondingly, the third elongation at break is 352.281%and the fourth elongation at break is 327.026%. In some embodiments, the ratio of the third tensile strength to the fourth tensile strength may also be 0.6, 0.8, 0.9, 1, etc., and the ratio of the third elongation at break to the fourth elongation at break may also be 1, 1.5, 2, etc.
[0060] In some embodiments, a package sheet 001 with a length of 180 mm in the first direction Y and a width of 15 mm in the second direction X can be obtained as a longitudinal (MD) sample, and a package sheet 001 with a length of 180 mm in the second direction X and a width of 15 mm in the first direction Y can be obtained as a transverse (CD) sample, by cutting with a tool such as scissors and the like. Subsequently, the longitudinal (MD) sample and the transverse (CD) sample are immersed in 30%acetic acid at 70℃ for 10 min to 15 min to separate the barrier layer from an adhesive layer and the inner cover layer 101. Then, the longitudinal (MD) sample and the transverse (CD) sample treated with the acetic acid are washed in water to separate the layers respectively, so that paperboard fibers of the inner cover layer 101 as obtained are removed as much as possible. Afterwards, the inner cover layer 101 is immersed in 20%sodium hydroxide for 5 min to 10 min and then is taken out for washing in the water. Subsequently, the inner cover layer is wiped up for testing the elongation at break and the tensile strength thereof.
[0061] Optionally, a tensiometer with the model number of TIRA 28025 is adopted to measure the first elongation at break in the first direction Y and the first tensile strength in the first direction Y of the longitudinal (MD) sample with only the inner cover layer 101, and the second elongation at break in the second direction X and the second tensile strength in the second direction X of the transverse (CD) sample with only the inner cover layer 101. Specifically, the longitudinal (MD) sample and the transverse (CD) sample that are provided with only the inner cover layer 101 may be placed under a standard climatic condition (with a temparature of 23℃±1℃ and a relative humidity of 50%±5%) for 24 hours, and then a test can be started; optionally, a test tensile force is 20 N, a test speed is 500 mm / min, and a test spacing is 50 mm, with a test ending condition that an upper limit of the sensor is reached or that a force value is reduced by 50%.
[0062] In some embodiments, in the container precursor provided by the embodiment of the present invention, a material of the carrier layer 103 may include fiber in order to enhance an anti-tensile capacity of the package sheet 001 in the second direction X. Optionally, the fiber may be at least one selected from the group consisting of a main fiber obtained from wood, a secondary fiber obtained from paper, a textile fiber, and a synthetic fiber. In some embodiments, an extension direction of the fiber may be inclined by -10 degrees to 10 degrees relative to the second direction X, for example, -10 degrees, -5 degrees, 0 degrees, 5 degrees, 10 degrees, and the like.
[0063] In some embodiments, in the container precursor provided by the embodiment of the present invention, as illustrated in FIG. 5 to FIG. 9, the barrier layer 102 includes a base layer 1021, a reinforcement layer 1022 and a protection layer 1023 which are arranged in a stacked manner. The base layer 1021 is arranged adjacent to the inner cover layer 101, and the protection layer 1023 is arranged adjacent to the carrier layer 103. The base layer 1021 is configured to realize basic water barrier function and oxygen barrier function. The reinforcement layer 1022 arranged on the base layer 1021 is configured to further improve the barrier capacity of the barrier layer 102 so that an overall water-oxygen permeability of the barrier layer 102 satisfies requirements for food package. The protection layer 1023 located on the reinforcement layer 1022 can protect the reinforcement layer 1022, and prevent the reinforcement layer 1022 from being scratched.
[0064] In some embodiments, a material of the base layer 1021 is a polymer material, such as oriented polymer, condensation polymer or polyester, and the like. In one of these embodiments, the oriented polymer is a uniaxially oriented polymer or a biaxially oriented polymer. Among them, the polymer is selected from the group consisting of condensation polymer, polyethylene, polypropylene and polyvinyl alcohol, or a combination of at least two of them. Optionally, the polypropylene is uniaxially oriented polypropylene (oPP) or biaxially oriented polypropylene (BoPP) ; the condensation polymer is polyester and / or polyamide (PA) , and the polyester is at least one of polyethylene terephthalate (PET) and polylactide (PLA) ; by way of example, the polyethylene terephthalate is biaxially oriented polyethylene terephthalate (BoPET) . Specifically, in the case where the base layer 1021 is a polyethylene terephthalate layer, the polyethylene terephthalate layer can not only be utilized to realize the basic water barrier function and oxygen-blocking function, but also provide a basic strength support for the reinforcement layer 1022. In addition, a material of the protection layer 1023 may be at least one selected from the group consisting of polyvinyl alcohol, silicone compound, acrylic ester and polyurethane.
[0065] In some embodiments, the reinforcement layer 1022 may include at least one selected from the group consisting of an aluminum oxide layer (AlOx) , a silicon oxide layer (SiOy) and a silicon oxycarbide layer (SiqOmCn) , where a range of the value of x in AlOx is 0.5-1.5, a range of the value of y in SiOy is 1-2, a range of the value of q in SiqOmCn is 15-30, a range of the value of m in SiqOmCn is 25-60, and a range of the value of n in SiqOmCn is 15-50. Optionally, the reinforcement layer 1022 includes an aluminum oxide layer and a silicon oxycarbide layer which are arranged in a stacked manner. Since the aluminum oxide material and the silicon oxycarbide material are in more compact arrangement at the atomic level as compared with the polymer barrier material, the reinforcement layer 1022 adopting these two layers does more excellence in the capacibility of water barrier and oxygenbarrier, thereby effectively improving the comprehensive performances of water barrier and oxygen barrier of the barrier layer. Moreover, by selecting values of x, y, q, m and n within the above-mentioned ranges, an atomic-level defect can be formed between the aluminum oxide layer and the silicon oxycarbide layer, and an covalent bond can be formed by using broken bonds in the surface, so that the bonding strength between the aluminum oxide layer and the silicon oxycarbide layer is enhanced. Optionally, the aluminum oxide layer may be located between the silicon oxycarbide layer and the protection layer 1023, or the silicon oxycarbide layer may be located between the aluminum oxide layer and the protection layer 1023. In some embodiments, the aluminum oxide layer and the silicon oxycarbide layer can be prepared respectively by chemical vapor deposition. By aodpting the chemical vapor depositoin method, it is more convenient to control the ratio of aluminum atoms to oxygen atoms in the aluminum oxide layer, and a ratio among silicon atoms, oxygen atoms and carbon atoms in the silicon oxycarbide layer.
[0066] In some embodiments, in the container precursor provided by the embodiment of the present invention, in order to enhance the performances of both water barrier and oxygen barrier of the barrier layer 102 as well as the adhesion strength with adjacent film layers, as illustrated in FIG. 5 and FIG. 6, the barrier layer 102 may further include a first inorganic oxide layer 1024 located between the base layer 1021 and the inner cover layer 101, and / or, a second inorganic oxide layer 1025 located between the protection layer 1023 and the carrier layer 103. The first inorganic oxide layer 1024 and the second inorganic oxide layer 1025 may include, but are not limited to, an aluminum oxide layer or a silicon oxide layer.
[0067] It should be noted that in the present invention, the barrier layer 102 may not contain any metal layer with light barrier effect, such as aluminum layer. Under such circumstance, in order to achieve the light barrier effect, as illustrated in FIGS. 5 to 9, the package sheet 001 may further include a light-shielding layer 104 located between the barrier layer 102 and the carrier layer 103. A material of the light-shielding layer 104 may include a light-shielding material; by way of example, the light-shielding material may be a carbon black color master batch with a light absorption function, and may also be a titanium dioxide color master batch with a light reflection function, etc. Specifically, the light-shielding layer 104 may be prepared by doping the light-shielding material into a polyethylene layer.
[0068] In some embodiments, in the container precursor provided by the embodiment of the present invention, as illustrated in FIG. 5 to FIG. 9, the package sheet 001 may further include a first adhesive layer 105 located between the light-shielding layer 104 and the barrier layer 102, and a second adhesive layer 106 located between the barrier layer 102 and the inner cover layer 101. Optionally, mateirals of the first adhesive layer 105 and the second adhesive layer 106 may be selected from polymers suitable for being used as adhesive materials, for example, the polymers are suitable for realizing functionalization by means of appropriate functional groups and for generating strong bonds by forming ionic bonds or covalent bonds with surfaces of adjacent layers. Optionally, the polymer suitable for an adhesive material may be polyethylene (PE) , or functionalized polyolefin such as polyethylene-maleic anhydride graft polymer (EMAH) , ethylene-acrylic acid copolymer (EAA) and ethylene-methacrylic acid copolymer (EMAA) .
[0069] In some embodiments, in the container precursor provided by the embodiment of the present invention, as illustrated in FIG. 5 to FIG. 9, the package sheet 001 may further include an outer cover layer 107 located at a side of the carrier layer 103 away from the inner cover layer 101, and the outer cover layer 107 may protect the patterns, characters or the like printed on the carrier layer 103. Alternatively, in some embodiments, the carrier layer 103 is not printed with any pattern, character or the like but a mimeograph layer is coated on the outer cover layer 107, and the mimeograph layer is provided with patterns, characters or the like for product introduction or promotion.
[0070] In some embodiments, the outer cover layer 107 includes polyethylene (PE) and / or polypropylene (PP) ; optionally, the polyethylene (PE) includes low-density polyethylene (LDPE) and / or high-density polyethylene (HDPE) . In the case where the outer cover layer 107 includes low-density polyethylene, a mass percentage of the low-density polyethylene in the outer cover layer 107 may be greater than or equal to 50%, for example, the mass percentage of the low-density polyethylene in the outer cover layer 107 is 50%, 60%, 70%, 80%, 90%, 100%, etc. The material of the outer cover layer 107 in the present invention is preferably low-density polyethylene.
[0071] In some embodiments, at least partial area of the outer cover layer 107 can also be doped with temperature-sensitive ink particles to form a temperature-sensitive color variable label, the temperature-sensitive color variable label can change its color by sensing a temperature of the sealed container to reflect its temperature and serve as a reminder. Optionally, the temperature-sensitive ink particles are reversible temperature-sensitive ink particles, so that the color of the temperature-sensitive color variable label will be gradually deepened with the increase of temperature, and gradually shallowed with the decrease of temperature, until returning to a color state at room temperature. In this way, when a consumer who heated a beverage but didn’t drink the beverage needs to heat the beverage again, the temperature-sensitive color variable label can be reused and can still play a role of reminder, which is beneficial to protecting the safety of the consumer. Alternatively, the temperature-sensitive ink particles can also be irreversible temperature-sensitive ink particles, so that after the color of the temperature-sensitive color variable label has been changed with the increase of temperature, it will not be changed again even if the temperature drops, but will remian as a color displayed when the box body reaches the highest temperature. In this way, the consumer can be informed of the information that the bevarage has been heated, and can choose to whether to heat the bevarage again according to his / her personal preferences; the sealed container can also be filled with some types of bevarages that cannot be re-heated, and in the case where the bevarage is heated but not drunk yet, the consumer can be reminded that it can not be heated again for drinking, so as to ensure the safety of the consumer.
[0072] In some embodiments, each polymer layer of the package sheet provided by the present invention, such as the outer cover layer 107, the inner cover layer 101, the light-shielding layer 104 and the barrier layer 102, may contain an antioxidant. The main function of the antioxidant is to ensure the stability of each polymer layer in high-temperature environment during a composite production process of the above-mentioned package sheet. The antioxidant can include, but be not limited to, one or a combination of more than one selected from the group consisting of: antioxidant made of phosphite ester, such as triphenyl phosphite and tris (2, 4-di-tert-butyl) phenyl phosphite; antioxidant made of hindered phenol, such as 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) octadecyl propionate, pentaerythritol tetras (3- (3, 5-di-tert-butyl-4-hydroxyphenyl) ) propionate, 2, 6-di-tert-butyl-4-methylphenol, 2-tert-butyl-4, 6-dimethylphenol, 2, 6-di-tert-butyl-4-ethylphenol, 2, 6-di-tert-butyl-4-butylphenol, 2, 6-di-tert-butyl-4-isobutylphenol, 2, 6-dicyclopentyl-4-methylphenol, 2- (α-methylcyclohexyl) -4, 6-dimethylphenol, 2, 6-octacosyl-4-methylphenol, 2, 4, 6- tricyclohexylphenol, 2, 6-di-tert-butyl-4-methoxymethylphenol, pentaerythritol tetras (3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, octadecyl -3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, 5-trimethyl-2, 4, 6-tris (3, 5-di-tert-butyl-4-hydroxybenzyl) benzene, and derivatives and mixtures thereof; antioxidant made of N, N-dialkyl-hydroxylamine, such as N, N-dodecyl hydroxylamine, N, N-tetracosyl hydroxylamine, N, N-hexacosyl hydroxylamine, N, N-octacosyl hydroxylamine, N-hexadecyl-N-octadecyl hydroxylamine, N-heptadecyl-N-octadecyl hydroxylamine, and derivatives and mixtures thereof.
[0073] In some embodiments, in the container precursor provided by the embodiment of the present invention, a plurality of inner cover layer polymers in the inner cover layer 101 may include a first inner cover layer polymer, and the mass percentage of the first inner cover layer polymer in the inner cover layer 101 is more than 35%, for example, 35%, 37.5%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100%, etc. The higher the proportion of the first inner cover polymer in the inner cover layer 101 is, the better the heat sealing effect will be, since the first inner cover layer has a better performance in heat absorption, providing a wider working window for heat-sealing.
[0074] Further, for example, the mass percentage of the first inner cover layer polymer in the inner cover layer 101 is more than 40%. In this way, the risk of package leakage of the sealed container can be further reduced. Preferably, the mass percentage of the first inner cover layer polymer in the inner cover layer 101 ranges from 37.5%to 50%, and further preferably is 45%. In some embodiments, the first inner cover layer polymer is metallocene polyolefin. The metallocene polyolefin is metallocene polyethylene (mPE) , for example. Compared with high-density polyethylene (HDPE) and low-density polyethylene (LDPE) , the metallocene polyethylene (mPE) film has lower melting point and obvious melting zone, and is considerably superior to traditional polyethylenes in toughness, transparency, thermal viscosity, heat sealing temperature and low odor, so it is more suitable for being used in flexible packaging films, such as shrink packaging films or composite flexible packaging films used in bottled water, beverages, canned goods, hand sanitizers, cleaning agents, health care products and skin care products. For example, metallocene polyethylene (mPE) includes linear low-density polyethylene (LLDPE) and very low-density polyethylene (VLDPE) .
[0075] In some embodiments, as illustrated in FIG. 5 to FIG. 9, the inner cover layer 101 may include a first inner layer 1011 and a second inner layer 1012, and the second inner layer 1012 is located between the first inner layer 1011 and the barrier layer 102. Optionally, the first inner cover layer polymer includes a first part distributed in the first inner layer 1011 and a second part distributed in the second inner layer 1012, and the mass percentage of the first part of the first inner cover layer polymer in the inner cover layer 101 is greater than or equal to the mass percentage of the second part of the first inner cover layer polymer in the inner cover layer 101. By distributing the first inner cover layer polymer in two layers (i.e., the first inner layer 1011 and the second inner layer 1012) and by setting the mass percentage of the first part of the first inner cover layer polymer to be greater than or equal to the mass percentage of the second part of the first inner cover layer polymer, it is possible to prevent from the leakage of the sealed container. Because the first inner cover layer has a better performance in heat absorption, it can provide a wider heat-sealing working window and hence achieve a better effect of heat sealing.
[0076] In some embodiments, the first inner layer 1011 and the second inner layer 1012 may in contact with each other, or may not be in contact with each other. For example, in FIG. 5 to FIG. 8, the first inner layer 1011 and the second inner layer 1012 are in contact with each other, and the mass percentage of the first part of the first inner cover layer polymer in the first inner layer 1011 is equal to the mass percentage of the second part of the first inner cover layer polymer in the second inner layer 1012. In the case where the mass percentage of the first part of the first inner cover layer polymer in the first inner layer 1011 is not equal to the mass percentage of the second part of the first inner cover layer polymer in the second inner layer 1012, the difficulty of forming the first inner layer 1011 or the second inner layer 1012 will be increased because it is required to adjust the weight of the first inner cover layer polymer according to different composition ratios in each inner layer. Therefore, by setting the mass percentage of the first part of the first inner cover layer polymer in the first inner layer 1011 to be equal to the mass percentage of the second part of the first inner cover layer polymer in the second inner layer 1012, the difficulty of production can be reduced, and a better effect of preventing from package leakage can be achieved at the same time.
[0077] In some embodiments, the plurality of inner cover layer polymers may further include a second inner cover layer polymer and a third inner cover layer polymer, both the second inner cover layer polymer and the third inner cover layer polymer are different from the first inner cover layer polymer. For example, in the case where the first inner cover layer polymer is one selected from the group consisting of high-density polyolefin, low-density polyolefin and metallocene polyolefin, the second inner cover layer polymer and the third inner cover layer polymer are the remaining two of the group consisting of high-density polyolefin, low-density polyolefin and metallocene polyolefin, respectively.
[0078] Further, in the case where the first inner cover layer polymer is one selected from the group consisting of high-density polyethylene (HDPE) , low-density polyethylene (LDPE) and metallocene polyethylene (mPE) , the second inner cover layer polymer and the third inner cover layer polymer are the remaining two of the group consisting of high density polyethylene (HDPE) , low-density polyethylene (LDPE) and metallocene polyethylene (mPE) , respectively. For example, in the case where the first inner cover layer polymer is mPE, the second inner cover layer polymer and the third inner cover layer polymer are LDPE and HDPE, respectively.
[0079] Low-density polyethylene (LDPE) is a kind of white resin which feels like wax and has non-linenar structural characteristics. Therefore, as compared with medium-density polyethylene and high-density polyethylene, low-density polyethylene has a lower crystallinity and a softening point, with better flexibility, elongation, electrical insulation and higher impact resistance strength. However, low-density polyethylene is poor in mechanical strength and heat resistance.
[0080] As compared with low-density polyethylene, high-density polyethylene has better heat resistance property and mechanical strength (such as tensile strength, bending strength, compression strength and shearing strength) , with improved barrier capacity to water vapor and gas.
[0081] In the above-described embodiment, by adopting the second inner cover layer polymer such as low-density polyethylene and by adopting the third inner cover layer polymer such as high density polyethylene, the heat resistance property and mechanical strength of the inner cover layer can be improved on the premise of ensuring better flexibility and electrical insulation of the package sheet.
[0082] For example, the mass percentage of a mixture composed of the second inner cover layer polymer and the third inner cover layer polymer in the inner cover layer 101 is greater than or equal to the mass percentage of the first inner cover layer polymer in the inner cover layer 101.
[0083] Compared with low-density polyethylene and high-density polyethylene, the material cost of metallocene polyethylene is higher. In the above-described embodiment, by setting the mass percentage of the mixture composed of the second inner cover layer polymer and the third inner cover layer polymer in the inner cover layer 101 to be greater than or equal to the mass percentage of the first inner cover layer polymer in the inner cover layer 101, the material of metallocene polyethylene used can be reduced on the premise of preventing the sealed container from leakage, so as to reduce the production cost of the product.
[0084] In some embodiments, the mixture composed of the second inner cover layer polymer and the third inner cover layer polymer includes a first part distributed in the first inner layer 1011 and a second part distributed in the second inner layer 1012, the mass percentage of the first part of the mixture in the first inner layer 1011 is equal to the mass percentage of the second part of the mixture in the second inner layer 1012.
[0085] In the case where the mass percentage of the first part of the mixture in the first inner layer 1011 is not equal to the mass percentage of the second part of the mixture in the second inner layer 1012, the difficulty of forming the first inner layer 1011 or the second inner layer 1012 will be increased because it is required to adjust the weight of the mixture according to different composition ratios in each inner layer. In this regard, by setting the mass percentage of the first part of the mixture in the first inner layer 1011 to be equal to the mass percentage of the second part of the mixture in the second inner layer 1012, the production difficulty can be reduced, and a better effect of preventing from package leakage can be achieved at the same time.
[0086] In at least one embodiment of the present invention, the mass percentage of the second inner cover layer polymer in the mixture may be equal or not to the mass percentage of the third inner cover layer polymer in the mixture, which can be chosen by those skilled in the art according to actual needs. In the case where the mass percentage of the second inner cover layer polymer in the mixture is equal to the mass percentage of the third inner cover layer polymer in the mixture, it is possible to avoid adjustments in forming each inner layer, thus reducing the difficulty of the production process.
[0087] In some embodiments, the first inner layer 1011 is composed of the first part of the first inner cover layer polymer and the first part of the mixture. In this case, the mass percentage of the first part of the first inner cover layer polymer in the first inner layer 1011 is in a range of 40%-50%, and the mass percentage of the first part of the mixture in the first inner layer 1011 is in a range of 50%-60%. Optionally, the mass percentage of the first part of the first inner cover layer polymer in the first inner layer 1011 is 40%, 45%or 50%; the mass percentage of the first part of the mixture in the first inner layer 1011 is 50%, 55%or 60%.
[0088] In some embodiments, the second inner layer 1012 is composed of the second part of the first inner cover layer polymer and the second part of the mixture. In this case, the mass percentage of the second part of the mixture in the second inner layer is in a range of 50%-60%, and the mass percentage of the second part of the first inner cover layer polymer in the second inner layer is in a range of 40%-50%. Optionally, the mass percentage of the second part of the first inner cover layer polymer in the first inner layer 1011 is 40%, 45%or 50%; the mass percentage of the second part of the mixture in the first inner layer 1011 is 50%, 55%or 60%.
[0089] In some embodiments, as illustrated in FIG. 8, the inner cover layer 101 may further include a third inner layer 1013 located between the second inner layer 1012 and the barrier layer 102, and the mixture further includes a third part located in the third inner layer 1013. Optionally, the third inner layer 1013 is composed of the third part of the mixture, that is, the third inner layer 103 is composed of the second inner cover layer polymer and the third inner cover layer polymer.
[0090] In some embodiments, as illustrated in FIG. 9, the inner cover layer 101 may further include a fourth inner layer 1014 located between the first inner layer 1011 and the second inner layer 1012, so that the first inner layer 1011 and the second inner layer 1012 are not in contact with each other. Because the first inner layer 1011 and the second inner layer 1012 are not in contact with each other, the mass percentage of the first part of the first inner cover layer polymer in the inner cover layer 101 may not be equal to the mass percentage of the second part of the first inner cover layer polymer in the inner cover layer 101.
[0091] Compared with the case where the mass percentage of the first part of the first inner cover layer polymer in the inner cover layer 101 is equal to the mass percentage of the second part of the first inner cover layer polymer in the inner cover layer 101, the present embodiment can improve the arrangement mode of the first inner layer 1011 and the second inner layer 1012 in the inner cover layer 101, which is beneficial to adding other additional layers between the first inner layer 1011 and the second inner layer 1012, for example, adding a layer that can increase the mechanical strength of the packaging material or a layer that can increase the elongation and the electrical insulation of the packaging material.
[0092] In some embodiments, under the circumstance that the first inner layer 1011 and the second inner layer 1012 are not in contact with each other, the mass percentage of the first part of the first inner cover layer polymer in the inner cover layer 101 is greater than the mass percentage of the second part of the first inner cover layer polymer in the inner cover layer 101. For example, in the case where the first inner cover layer polymer is mPE, by setting a mass percentage of a part of mPE contained in the first inner layer 1011 in the inner cover layer 101 to be greater than that of a part of mPE contained in the second inner layer 1012 in the inner cover layer 101, the material at the side close to the inner surface of the package sheet has better toughness, thereby further preventing from the risk of package leakage.
[0093] In some embodiments, under the circumstance that the inner cover layer 101 includes the first inner layer 1011, the fourth inner layer 1014 and the second inner layer 1012 which are arranged in a stacked manner, a mixture composed of the second inner cover layer polymer and the third inner cover layer polymer may be distributed in at least one of the first inner layer 1011 and the fourth inner layer 1014. By distributing the mixture in at least one of the first inner layer 1011 and the fourth inner layer 1014, the heat resistance property and mechanical strength of the first inner layer 1011 or the fourth inner layer 1014 can be improved on the premise that the first inner layer 1011 or the fourth inner layer 1014 has good flexibility and electrical insulation. Optionally, the mixture may be distributed only in the first inner layer 1011, and the fourth inner layer 1014 is composed of one of the second inner cover layer polymer and the third inner cover layer polymer; alternatively, one part of the mixture is distributed in the first inner layer 1011 and another part of the mixture is distributed in the fourth inner layer 1014.
[0094] Based on the same inventive concept, the embodiments of the present invention further provide a sealed container. As illustrated in FIG. 12 and FIG. 13, the sealed container is configured for containing a foodstuff F. The sealed container can be obtained by folding and sealing an upper end and a lower end of the container precursor described above.
[0095] In some embodiments, as illustrated in FIG. 12, the sealed container may further include a straw S. The straw S may be installed on a side wall of the box body (for example, the side wall where the longitudinal seam J is located) . For example, a buckle is provided on the side wall, and the buckle has a clamping groove for cooperating with the straw S. The straw may be directly clamped in the clamping groove and fixed onto the box body, or, the straw may be adhered onto the side wall through a glue. In some embodiments, the straw S itself may be a temperature-sensitive color variable straw, and is closely attached onto the box body, so as to sense a temperature variation of the box body and change its color due to the temperature variation of the box body. For example, the color of the straw S is gradually deepened with the increase of temperature. Based on this, the straw S can also be used as a temperature-sensitive color variable label on the sealed container and serve as a reminder. Moreover, after the straw S is inserted into the box body through a through hole H penetrating through the carrier layer and the outer cover layer, the straw S can be in direct contact with the foodstuff F in the box body, so as to reflect the temperature of the foodstuff F inside the box body more directly; in this way, the consumer can determine whether it is suitable for drinking according to the color of the straw S.
[0096] In some embodiments, as illustrated in FIG. 13, the sealed container can also be connected to a cap C that can be opened. The cap C covers the through hole H penetrating through the carrier layer and the outer cover layer, and a cutting tool is on an inner side of the cap C or on the edge of the cap C. The cutting tool is capable of puncturing a composite layer, the barrier layer, the inner cover layer and the like at the through hole H, so that the foodstuff F inside the sealed container can be eaten through the through hole H.
[0097] In some embodiments, during a process of fabricating the sealed container from the package sheet, the package sheet can be folded firstly, and an area of the longitudinal seam of the package sheet can be adhered to form a container precursor with two end openings, namely an upper end opening and a lower end opening. Then the container precursor is sealed at the bottom, filled with liquid, and sealed at the top. Finally, the sealed container is formed. The sealed container can have various structures, such as a flat-top shape or a gable top shape.
[0098] In the embodiments of the present invention, FIG. 2, FIG. 12 and FIG. 13 illustrate a sealed container in a flat-top shape. FIG. 14 is another schematic structural diagram of a sealed container provided by an embodiment of the present invention. The sealed container illustrated in FIG. 14 is a sealed container in a gable top shape. As can be seen from FIG. 2 and FIG. 12 to FIG. 14, the sealed container has four side edges, and these four side edges will be described in the following with reference to the sealed container 100 of FIG. 14 as an example. It should be understood that the following improvements to the side edges can be applied to the sealed container illustrated in FIG. 2 and FIG. 12-FIG. 14.
[0099] As illustrated in FIG. 14, the sealed container 100 includes four longitudinally extending side edges LE1, LE2, LE3 and LE4. When forming the sealed container, it is required to fold two opposite side edges of the container precursor, so that a cross-sectional shape of the sealed container is more approximate to a rectangle or a square.
[0100] FIG. 15 is a schematic cross-sectional view of FIG. 14. As illustrated in FIG. 15, a force F1 is exerted along a vertical direction firstly to fold the two opposite side edges LE1 and LE3, and then a force F2 is exerted along a horizontal direction to fold the other two opposite side edges LE2 and LE4. The above-mentioned folding can cut off fibers in the composite material of each side edge, which is beneficial to forming a sealed container 100 with a more regular cross-sectional shape.
[0101] In order to improve the comfort of grip and the sense of design of the sealed container, a gripping surface formed by chamfering or cutting off corners can be designed on the side edges (for example, the side edges LE1 and LE3) . Due to the existence of the gripping surface, the side edges LE1 and LE3 cannot be completely folded when the force F1 is exerted, which results in that the cross-sectional shape of the formed container precursor is not a regular rectangle or a regular square. Instead, side edges LE1 and LE3 with certain radians may be formed, as illustrated in Fig. 16.
[0102] Such kind of side edge with a certain radian not only diminishes the sense of design of the sealed container, but also affects the sealing effect when the bottom or the top is sealed. For example, in order to improve the sealing effect of the package, a filling machine can be provided with at least one heating device for heating the top opening or the bottom opening (collectively referred to as the end opening) of the package. This pretreatment for the housing is also referred to as “activation” , which can improve the sealing quality. For example, the plastic contained in the packaging material can be softened by heating, which is conducive to the top or the bottom to be sealed (for the specific activation process, reference to the prior Chinese patent application No. 201180053901.1) . For example, before the bottom is sealed, it is required to heat (also referred to as activation) the bottom of the sealed container. When a heating nozzle is inserted into the end opening along an axial direction of the container precursor in Fig. 16 (inwardly along the plane of the paper) , a distance from the side edges LE1, LE3 to the heating nozzle is not equal to a distance from the other two side edges LE2, LE4 to the heating nozzle, which results in uneven activation and poor sealing performance of the sealed container.
[0103] To this end, another embodiment of the present invention provides a package sheet. The package sheet includes a folding pattern and is configured to be folded along the folding pattern to form a sealed container having a top and a bottom. The folding pattern includes: a first crease line that at least partially forms a circumference of the top, a second crease line that at least partially forms a circumference of the bottom, and a sub-folding pattern located between the first crease line and the second crease line along a longitudinal direction, and the sub-folding pattern intersects with the first crease line and the second crease line at a first intersection point and a second intersection point, respectively. The sub-folding pattern includes a curved crease line connected between the first intersection point and the second intersection point along the longitudinal direction. In the longitudinal direction, a minimum space between the curved crease line and the first intersection point is a first space, and a minimum space between the curved crease line and the second intersection point is a second space, and a ratio of at least one of the first spacing and the second spacing to a space between the first intersection point and the second intersection point along the longitudinal direction is greater than or equal to 3%.
[0104] In the package sheet provided by the above-described embodiment of the present invention, the ratio of at least one of the first spacing and the second spacing to the space between the first intersection point and the second intersection point along the longitudinal direction is set to be greater than or equal to 3%, so that at least one of the first spacing and the second spacing is lengthened, which can ensure that the cross-sectional shape of the package close to the end opening is more approximate to a rectangle or a square when the sealed container is formed, thereby improving the sealing performance of the sealed container without affecting the aesthetics.
[0105] Hereinafter, the present invention will be explained through several specific embodiments. In order to keep the following description of embodiments of the present invention clear and concise, detailed descriptions of known functions and known components may be omitted. When any component of an embodiment of the present invention appears in more than one drawing, this component may be represented by the same reference numeral in each drawing.
[0106] FIG. 17 is a schematic planar view of a package sheet 001 provided by an embodiment of the present invention. FIG. 18 is a schematic structural diagram of a sealed container 100 provided by an embodiment of the present invention. For example, FIG. 18 illustrates a sealed container obtained by folding the package sheet 001 of FIG. 17.
[0107] As illustrated in FIG. 18, the sealed container 100 includes a housing 10, a flow guide member 20 and a cap C. The housing 10 includes a top 1, a bottom 2 and a side wall 3 connecting the top 1 and the bottom 2. The top 1 has top corners 11 to 14 (only 11, 12 and 14 are illustrated in the figure) , and the bottom 2 has bottom corners 21 to 24 (only 21, 22 and 24 are illustrated in the figure) .
[0108] FIG. 18 only illustrates four top corners and four bottom corners. However, in other embodiments of the present invention, the number of the top corners and the number of the bottom corners may be other values, for example, three, five or more, which is not limited in the embodiments of the present invention.
[0109] In the embodiment of the present invention, the number of the top corners may be the same with or different from the number of the bottom corners. In the case where the number of the top corners is the same with the number of the bottom corners, the process and production are facilitated in a better way; in the case where the number of the top corners is different from the number of the bottom corners, the sealed container can be more personalized in design. The embodiment of the present invention describes the case where the two numbers are different, by way of example.
[0110] For example, the side wall 3 includes four side edges LE1 to LE4 (only LE1, LE2 and LE4 are illustrated in the figure) , and each side edge connects one top corner and one bottom corner corresponding to the respective one top corner. For example, the side edge LE1 connects the top corner 11 and the bottom corner 21 along the substantially longitudinal direction (i.e., the first direction Y) , the side edge LE2 connects the top corner 12 and the bottom corner 22 along the substantially longitudinal direction (i.e., the first direction Y) , and the side edge LE4 connects the top corner 14 and the bottom corner 24 along the substantially longitudinal direction (i.e., the first direction Y) . The housing 10 can be unfolded at positions where the four side edges LE1 to LE4 are located, and formed into the package sheet 001 of FIG. 17 after being unfolded.
[0111] As illustrated in FIG. 17, the package sheet 001 includes a folding pattern FP including a first crease line FL1 and a second crease line FL2. The first crease line FL1 at least partially forms a circumference of the top 1 of the housing 10 in FIG. 18, the second crease line FL2 at least partially forms a circumference of the bottom 2 of the housing 10, thereby defining the top 1, the side wall 3 and the bottom 2 after folding the package sheet 001. For example, both the first crease line FL1 and the second crease line FL2 extend substantially along a transverse direction (i.e., the second direction X) , thereby dividing the package sheet into a top region TR, a bottom region BR and a middle region MR. The top region TR has a top folding pattern for forming the top 1, the bottom region BR has a bottom folding pattern for forming the bottom 2, and the middle region MR has a middle folding pattern for forming the side wall 3.
[0112] For example, the folding pattern FP further includes four sub-folding patterns FP1 to FP4, and each of the sub-folding patterns is located between the first crease line FL1 and the second crease line FL2 along the longitudinal direction (i.e., the first direction Y) , that is, each of the sub-folding patterns belongs to the middle folding pattern. The sub-folding patterns FP1 to FP4 extend substantially along the longitudinal direction (i.e., the first direction Y) , so that the side edges LE1 to LE4 of FIG. 18 are formed after the package sheet 001 is folded. In the embodiment of the present invention, "substantially" refers to that the overall extending trend or extending tendency is along this direction but is not necessary to strictly follow this direction, and a certain deviation from this direction is allowed.
[0113] FIG. 17 only illustrates four sub-folding patterns. In other embodiments of the present invention, the number of the sub-folding patterns located between the first crease line FL1 and the second crease line FL2 may be other values, for example, two, three, five or more, which is not limited in the embodiments of the present invention. The embodiment of the present invention is described with reference to the case where the number of the sub-folding patterns is four, by way of example.
[0114] As illustrated in FIG. 17, each of the four sub-folding patterns intersects with the first crease line FL1 and the second crease line FL2, respectively. The sub-folding pattern FP1 intersects with the first crease line FL1 and the second crease line FL2 at a first intersection point A1 and a second intersection point A2, respectively. The sub-folding pattern FP3 intersects with the first crease line FL1 and the second crease line FL2 at two intersection points (not labeled) , respectively. Both the sub-folding pattern FP1 and the sub-folding pattern FP3 include a curved crease line 111. For example, the curved crease line 111 includes a pair of curved lines, so that a gripping area 41 for easy grip can be formed by using this pair of curved lines when folding the package sheet 001. As illustrated in FIG. 18, the gripping area 41 is a curved surface formed on the side edge LE1. Because the curved surface has a certain radian, it is not only convenient to grip the sealed container 100 but also improves the aesthetics of the sealed container.
[0115] In the embodiment of the present invention, the term "intersection point" may refer to a real intersection point where two crease lines intersect with each other, or may refer to a virtual intersection point where extending directions of two crease lines intersect with each other. For example, in the case where the crease line is a groove line, an intersection point formed by extending directions of two groove lines may also be the first intersection point or the second intersection point.
[0116] FIG. 17 only illustrates two sub-folding patterns FP1 and FP3 among the four sub-folding patterns FP1 to FP4 that respectively include the curved crease line 111. In other embodiments, one, three or four of the sub-folding patterns may respectively include the curved crease line 111. In the embodiment of the present invention, at least one of the sub-folding patterns FP1 to FP4 may include the curved crease line 111. Further, at least two of the sub-folding patterns FP1 to FP4 respectively include the curved crease line 111. Still further, at least three of the sub-folding patterns FP1 to FP4 respectively include the curved crease line 111. Even still further, each of the sub-folding patterns FP1 to FP4 is provided with the curved crease line 111. In the case where two of the sub-folding patterns FP1 to FP4 respectively include the curved crease line 111, these two sub-folding patterns may be adjacent to each other, or may not be adjacent to each other.
[0117] In an embodiment of the present invention, two sub-folding patterns FP1 and FP3 are not arranged adjacent to each other, i.e., the two sub-folding patterns FP1 and FP3 are located in a diagonal direction. In this way, on one hand, the comfort of grip and the aesthetics can be improved; on another hand, a force subjected by the two sub-folding patterns can be better controlled in a pre-folding process so as to improve the pre-folding effect; and on still another hand, because the force subjected at the positions where the two sub-folding patterns FP1 and FP3 are located is relatively uniform after the fabrication of the sealed container is completed, the stress resistance property of the sealed container during transportation can be increased, which is beneficial to avoiding a deformation of the sealed container.
[0118] As illustrated in FIG. 17, in the longitudinal direction (i.e., the first direction Y) , a minimum space between the curved crease line 111 and the first intersection point A1 is a first space d1, a minimum space between the curved crease line 111 and the second intersection point A2 is a second space d2, and a space L is between the first intersection point A1 and the second intersection point A2. The first spacing d1 and the second spacing d2 are equal, and a ratio of each of the first spacing d1 and the second spacing d2 to the space L is greater than or equal to 3%.
[0119] Through the above-mentioned arrangement, a distance between the curved crease line 111 and both of the first crease line FL1 and the second crease line FL2 can be kept large. In this way, when the two side edges, where the sub-folding patterns FP1 and FP3 are located, are folded in the manner illustrated in FIG. 15, parts of the sub-folding patterns FP1 and FP3 that are close to the first intersection point A1 and parts of the sub-folding patterns FP1 and FP3 that are close to the second intersection point A2 can be folded more completely, so that the cross-sectional shape of the sealed container or the container precursor close to the openings at the two ends is more regular, that is, more approximate to a square or rectangle. If the end opening is heated by using the heating nozzle, the activation can be more uniform, and the sealing effect can be improved.
[0120] In an embodiment of the present invention, a height of the gripping area 41 relative to the bottom is adjustable, and both the first spacing d1 and the second spacing d2 are changeable. Generally, the larger both the first spacing d1 and the second spacing d2, the better. The first spacing d1 affects the sealing effect at the top, and the second spacing d2 affects the sealing effect at the bottom. For example, in the case where the second spacing d2 is smaller than 3%of the space l, the side edge having a certain radian will affect a position alignment of an ultrasonic heating nozzle when sealing the bottom, thus affecting the sealing effect at the bottom. In the case where the first spacing d1 is smaller than 3%of the space L, the side edge having a certain radian will affect the position alignment of the ultrasonic heating nozzle when sealing the top, thus affecting the sealing effect at the top.
[0121] FIG. 17 only illustrates the case where the first spacing d1 is equal to the second spacing d2. However, in other embodiments, the first spacing d1 may also be not equal to the second spacing d2, which is not limited in the embodiment of the present invention. For example, a ratio of the first spacing d1 to the space L is greater than or equal to 3%, and a ratio of the second spacing d2 to the space L is greater than or equal to 7%.
[0122] For example, the space L is 146 mm, and both the first spacing d1 and the second spacing d2 range from 5 mm to 25 mm. If the first spacing d1 and the second spacing d2 are too small, the shape of the top will be affected; and if the first spacing d1 and the second spacing d2 are too large, the comfort of grip will be affected. Both the first spacing d1 and the second spacing d2 are, for example, 5 mm, 10 mm, 15 mm, 20 mm and 25 mm. Preferably, both the first spacing d1 and the second spacing d2 range from 10 mm to 20 mm.
[0123] FIG. 19 is a photograph of an end opening of a container precursor formed by folding a package sheet provided by an embodiment of the present invention. FIG. 20 is a photograph of an end opening of a container precursor formed by folding a package sheet provided by another embodiment of the present invention.
[0124] Both FIG. 19 and FIG. 20 illustrate a container precursor formed by folding the package sheet illustrated in FIG. 17. The volume of the sealed container is 180 ml, and the space L is 74 mm. The difference between these two figures is that the first spacing d1 and the second spacing d2 in FIG. 19 are 10 mm, and both the first spacing d1 and the second spacing d2 in FIG. 20 are 20 mm. As can be seen from FIG. 19 and FIG. 20, the cross-sectional shape of the end opening of the container precursor is more approximate to a square. Compared with that illustrated in FIG. 16, the side edge having a certain radian is eliminated, therefore the cross-sectional shape is more regular and the sealing effect is better.
[0125] FIG. 21 and FIG. 22 are photographs of the sealed container respectively illustrated in FIG. 19 and FIG. 20 in an activation position. As can be seen from Fig. 21 and Fig. 22, after the activation, the sealed container also has a more regular shape, which improves the sealing effect after the heating in the activation.
[0126] FIG. 23 is a comparison diagram of test results of a sealed container under different space values as provided by an embodiment of the present invention.
[0127] Table 1 illustrates settings of various parameters of samples 1 to 5. Among them, the sealed containers of samples 1 to 5 have the same volume of 350 ml, and have the same space L of 146 mm between the first intersection point A1 and the second intersection point A2, with the difference that the first spacing d1 and the second spacing d2 have different values in different samples.
[0128] Table 1
[0129] FIG. 23 illustrates the test results of samples 1, 3 and 5. The first row of images are photographs illustrating a partial structure of the package sheet. The second row of images are photographs illustrating the samples in an activation position. The third row of images are photographs illustrating the samples in a sealing position. The fourth row of images are photographs illustrating the activation pattern for proving the activating effect or the sealing effect.
[0130] As illustrated in FIG. 23, it can be seen from the images in the second and third rows that, the cross-sectional shapes of the samples 1, 3 and 5 close to the end openings in both the activation position and the sealing position are relatively regular, and the side edges having a certain radian in FIG. 16 have been eliminated. It can be seen from the images in the fourth row that the activation patterns in the circles a1, a2 and a3 of the samples 1, 3 and 5 are increasingly approaching to be symmetrical (that is, the symmetry of the left-sided and right-sided protrusions in the circle) , which means that the larger the first spacing d1 and the second spacing d2 are, the farther the gripping area is from the end opening, the better the activating effect and the better the sealing performance. Although the left-sided protrusion and right-sided protrusion in a1 are not exactly symmetrical, the activating effect is better than that of the side edges having a certain radian.
[0131] Therefore, in an embodiment of the present invention, values of d1 / L or d2 / L is preferably greater than or equal to 3%, more preferably greater than or equal to 7%, still more preferably greater than or equal to 10%, still more preferably greater than or equal to 14%, and still more preferably greater than or equal to 17%.
[0132] FIG. 23 only illustrates the case where the first spacing d1 is equal to the second spacing d2. It should be understood that in other embodiments of the present invention, the first spacing d1 may also be different from the second spacing d2.
[0133] For example, in the case where the first spacing d1 is different from the second spacing d2 and d1 / L is greater than or equal to 3%, the gripping area is made farther from the top opening, so that the activating effect and sealing performance of the top opening can be improved. In this case, the second spacing d2 may be greater than or equal to 0.
[0134] For example, in the case where the first spacing d1 is different from the second spacing d2 and d2 / L is greater than or equal to 3%, the gripping area is made farther from the end opening, so that the activating effect and sealing performance of the end opening can be improved. In this case, the first spacing d1 may be greater than or equal to 0.
[0135] As illustrated in FIG. 18, assuming that a maximum length of the curved crease line 111 or the gripping area 41 along the longitudinal direction (the first direction Y) is T, then T / L = 1-d1 / L-d2 / L. In this embodiment, T / L is greater than zero, preferably greater than or equal to 5%, more preferably greater than or equal to 10%, and even more preferably greater than or equal to 50%.
[0136] In an example, d1 / L is greater than or equal to 3%and smaller than 100%, preferably greater than or equal to 3%and smaller than or equal to 95%, more preferably greater than or equal to 3%and smaller than or equal to 90%, and even more preferably greater than or equal to 3%and smaller than or equal to 50%.
[0137] In another example, d2 / L is greater than or equal to 3%and smaller than 100%, preferably greater than or equal to 3%and smaller than or equal to 95%, more preferably greater than or equal to 3%and smaller than or equal to 90%, and even more preferably greater than or equal to 3%and smaller than or equal to 50%.
[0138] In the embodiments of the present invention, the first spacing d1, the second spacing d2, the space L, and the maximum length T of the gripping area 41 satisfy the following relationship: L = d1+d2+T. Those skilled in the art can adjust respective parameters to satisfy the above relationship based on the contents of the above disclosed embodiments.
[0139] In actual production process, a height of the sealed container may be varied with the volume of the sealed container. Table 2 illustrates specific magnitudes of the space L and the first spacing d1, and relative proportional relationships thereof under different volume specifications of the sealed containers. The second spacing d2 can be configured with reference to Table 2. Therefore, better activating effect and better sealing effect of the end opening of the sealed container under various capacities can be guaranteed.
[0140] For example, a ratio of each of the first spacing d1 and the second spacing d2 to the space L is greater than or equal to 7%, and more preferably, the ratio of each of the first spacing d1 and the second spacing d2 to the space L is greater than or equal to 8%. Further preferably, the ratio of each of the first spacing d1 and the second spacing d2 to the space L is greater than or equal to 10%. Through the above-mentioned arrangement, the first spacing d1 and the second spacing d2 can satisfy the requirements of the sealed container under different capacities, which is more helpful for the cross-sectional shape of the folded, sealed container or container precursor close to the openings at both ends to be more regular and have better sealing effect.
[0141] Table 2
[0142] For example, in the case where the volume of the sealed container is 350 ml and the first spacing d1 ranges from 10 mm to 20 mm, the value of d1 / L is 7%to 14%, thereby ensuring better activating effect and sealing effect of the top opening of the sealed container under this volume. For example, in the case where the volume of the sealed container is 330 ml and the first spacing d1 ranges from 10 mm to 20 mm, the value of d1 / L ranges from 7%to 14%, thereby ensuring better activating effect and sealing effect of the top opening of the sealed container under this volume. For example, when the volume of the sealed container is 290 ml and the first spacing d1 ranges from 10 mm to 20 mm, the value of d1 / L ranges from 8%to 16%, thereby ensuring better activating effect and sealing effect of the top opening of the sealed container under this volume. For example, in the case where the volume of the sealed container is 250 ml and the first spacing d1 ranges from 10 mm to 20 mm, the value of d1 / L ranges from 10%to 19%, thereby ensuring better activating effect and sealing effect of the top opening of the sealed container under this volume. For example, in the case where the volume of the sealed container is 220 ml and the first spacing d1 ranges from 10 mm to 20 mm, the value of d1 / L ranges from 11%to 22%, thereby ensuring better activating effect and sealing effect of the top opening of the sealed container under this volume. For example, in the case where the volume of the sealed container is 200 ml and the first spacing d1 ranges from 10 mm to 20 mm, the value of d1 / L ranges from 12%to 24%, thereby ensuring better activating effect and sealing effect of the top opening of the sealed container under this volume. For example, in the case where the volume of the sealed container is 180 ml and the first spacing d1 ranges from 10 mm to 20 mm, the value of d1 / L ranges from 14%to 27%, thereby ensuring better activating effect and sealing effect of the top opening of the sealed container under this volume. By setting the second spacing d2 with reference to FIG. 15, it can achieve the same technical effects, which will not be repeated here.
[0143] As illustrated in FIG. 17, the sub-folding pattern FP1 further includes a first longitudinal crease line 121 and a second longitudinal crease line 122, the first longitudinal crease line 121 is connected between the curved crease line 111 and the first intersection point A1 along the longitudinal direction (i.e., the first direction Y) , and the second longitudinal crease line 122 is connected between the curved crease line 111 and the second intersection point A2 along the longitudinal direction (i.e., the first direction Y) . The first longitudinal crease line 121 and the second longitudinal crease line 122 are arranged symmetrically relative to the curved crease line 111. Through the above-mentioned arrangement, the cross-sectional shape of the sealed container or container precursor close to the top 1 and bottom 2 can be made more regular, thereby further improving the sealing performance at the top and the bottom of the sealed container.
[0144] As illustrated in FIG. 17, the first longitudinal crease line 121 has a first longitudinal length l1 along the longitudinal direction Y, the first longitudinal length l1 is just the first spacing d1; and the second longitudinal crease line 122 has a second longitudinal length l2 along the longitudinal direction Y, which is just the second spacing d2, and the first longitudinal length l1 is equal to the second longitudinal length l2. By setting the first longitudinal length l1 to be equal to the second longitudinal length l2, it can ensure that the first spacing d1 is equal to the second spacing d2 after the package sheet is folded, which is beneficial to forming a more regular cross-sectional shape of the sealed container or container precursor close to the openings at both ends, thereby improving the sealing effect.
[0145] In an embodiment of the present invention, distances from the respective curved crease lines 111 of the two sub-folding patterns FP1, FP3 to the first crease line FL1 are the same, or distances from the respective curved crease lines 111 of the two sub-folding patterns FP1, FP3 to the second crease line FL2 are the same, or all the distances from the respective curved crease lines 111 of the two sub-folding patterns FP1, FP3 to the first crease line FL1 and to the second crease line FL2 are the same, thereby reducing the difficulty of the production process.
[0146] As illustrated in FIG. 17, the sub-folding patterns FP1 and FP2 (i.e., the first sub-folding pattern) are provided with the curved crease line 111, while the sub-folding patterns FP2 and FP4 (i.e., the second sub-folding pattern) are not provided with the curved crease line 111. The first sub-folding pattern and the second sub-folding pattern are alternately arranged along the transverse direction (i.e., the second direction X) which is perpendicular to the longitudinal direction (i.e., the first direction Y) . It should be understood that in at least one embodiment of the present invention, it is also possible that the sub-folding patterns FP2 and FP4 (i.e., the second sub-folding pattern) are provided with the curved crease line, while the sub-folding patterns FP1 and FP3 are not provided with the curved crease line 111. By arranging the curved crease line 111 on the sub-folding patterns FP1 and FP3 (i.e., the first sub-folding pattern) , the gripping area can be formed on opposite side edges of the sealed container, thereby improving the comfort of grip of the sealed container.
[0147] As illustrated in FIG. 17, four sub-folding patterns FP1 to FP4 intersect with the first crease line FL1 at four first intersection points A1, and a part of the first crease line FL1 located between two adjacent first intersection points A1 has a radian. In a sealed container without the above-mentioned design of curved radian, a straight line-shaped rib is formed between the two intersection points, and if the liquid contained in the sealed container is mixed with particles, these particles will be easily accumulated on an inner wall where the rib of the sealed container is located, which may affect the drinking experience. Through the above-mentioned design of the radian, it is possible to avoid the formation of the rib between two adjacent first intersection points A1. Such design is advantageous in that, on the one hand, it can avoid the formation of stress concentration points at these positions; and on the other hand, it can reduce the accumulation of particles in the liquid at these positions and is beneficial for the flow of the particles.
[0148] For example, the radius of curvature of the radian is 60 mm to 155 mm, and the width of the radian in the longitudinal direction (i.e., the first direction Y) is greater than 2 mm. In this way, a circumference of the top as formed is arc-shaped, which improves the aesthetics.
[0149] For example, as illustrated in FIG. 18, the width w of the curved crease line 111 or the gripping area 41 in the transverse direction ranges from 8 mm to 12 mm, for example, 8 mm, 10 mm or 12 mm, which is beneficial to improving the compressive strength of the sealed container in the longitudinal direction and also improves the comfort of grip.
[0150] In at least one embodiment of the present invention, the plurality of curved crease lines on the sealed container may have the same width w or different widths w. In the case where they have the same width, the production process of the package sheet can be simplified; and in the case where they have different widths, the usage requirements of different products can be satisfied.
[0151] The package sheet of FIG. 17 is folded to form the sealed container of FIG. 18. The first intersection point A1 defines a top corner 11, the second intersection point A2 defines a bottom corner 21, the sub-folding pattern FP1 is formed as a side edge LE1, and the curved crease line 111 is formed as a gripping area 41 located on the side edge LE1.
[0152] As illustrated in FIG. 18, the gripping area 41 has a gripping center 41c along the longitudinal direction (i.e., the first direction Y) , and the side edge LE1 has a side edge midpoint LE1c along the longitudinal direction (i.e., the first direction Y) . In an embodiment of the present invention, the gripping center 41c and the side edge midpoint LE1c may or may not coincide with each other. In the case where the gripping center 41c and the side edge midpoint LE1c coincide with each other, it is useful for the first spacing d1 to be equal to the second spacing d2, which is useful for the sealed container or the container precursor to have a more regular cross-sectional shape close to the openings at the two ends, thus improving the sealing effect. In the case the gripping center 41c and the side edge midpoint LE1c do not coincide with each other, the diversity of product design can be improved. In at least one embodiment of the present invention, the gripping center 41c and the side edge midpoint LE1c coincide with each other to reduce the difficulty of process design.
[0153] As illustrated in FIG. 18, a plurality of top corners 11, 12, 13, 14 are in one-to-one correspondence with a plurality of bottom corners 21, 22, 23, 24, and a plurality of side edges LE1, LE2, LE3, LE4 connect the plurality of top corners 11, 12, 13, 14 and the corresponding plurality of bottom corners 21, 22, 23, 24, respectively. Because two curved crease lines 111 are formed in FIG. 17, the side edges LE1 and LE3 among the plurality of side edges LE1, LE2, LE3 and LE4 are respectively provided with a gripping area 41.
[0154] FIG. 24 is a schematic cross-sectional view taken along a direction of a plane where a bottom surface of the sealed container of FIG. 18 is located. As illustrated in FIG. 18 and FIG. 24, a diagonal direction D is parallel to a plane where the bottom 2 is located, the two top corners 11 and 13 are oppositely arranged along the diagonal direction D, the two bottom corners 21 and 23 are oppositely arranged along the diagonal direction D and respectively correspond to the two top corners 11 and 13; the two side edges LE1 and LE3 respectively connect the two top corners 11, 13 with the corresponding two bottom corners 21, 23; and the two side edges LE1 and LE3 are respectively provided with the gripping area 41. Because the gripping areas are arranged on two side edges that are opposite to each other, the comfort of grip can be improved.
[0155] As illustrated in FIG. 17 and FIG. 18, the side edge LE1 (i.e., a first side edge) has a gripping area 41 (i.e., a first gripping area) , and the side edge LE3 (i.e., a second side edge) has a gripping area 41 (i.e., a second gripping area) . The first gripping area 41 has a first gripping center 41c along the longitudinal direction (i.e., the first direction Y) , the second gripping area 43 has a second gripping center (not illustrated) along the longitudinal direction (i.e., the first direction Y) , and the first gripping center 41c and the second gripping center 43c have the same height relative to the bottom 2. By setting the first gripping area and the second gripping area to have the same height relative to the bottom 2, the aesthetic appearance can be improved and the difficulty of production process can be reduced.
[0156] Further, the first side edge LE1 has a first side edge midpoint LE1c along the longitudinal direction (i.e., the first direction Y) , the second side edge LE3 has a second side edge midpoint (not illustrated) along the longitudinal direction (i.e., the first direction Y) , the first gripping center 41c coincides with the first side edge midpoint LE1c, and the second gripping center coincides with the second side edge midpoint. Through the above-mentioned arrangement, it is useful for the first spacing d1 to be equal to the second spacing d2, thus contributing to a more regular cross-sectional shape of the sealed container or container precursor close to the openings at the two ends, thereby improving the sealing effect.
[0157] In an embodiment of the present invention, the first gripping area 41 and the second gripping area 43 may have the same area or different areas. In the case where the two have the same area, it is beneficial to simplifying the production process of the package sheet. In the case where the two have different areas, the products can have diversified designs to meet the requirements of different users.
[0158] As illustrated in FIG. 18, the sealed container 100 further includes a flow guide member 20 connected to the top 1 of the housing 10, and the flow guide member 20 is configured to allow the liquid in the housing 10 to flow out through the flow guide member 20. The top 1 has an end, the size of the end of the top 1 is gradually decreased along a direction towards the flow guide member 20, and the top 1 is attached to the flow guide member 20 through this end.
[0159] For example, the flow guide member 20 includes a flow guide nozzle 201 and a flange portion 202, and the end of the top 1 includes four top side walls 15, and the four top side walls 15 are located around the flange portion 202 and attached to the flange portion 202. Through the above-mentioned arrangement, the liquid can be guided to flow out of the sealed container quickly.
[0160] FIG. 25 is a schematic structural diagram of a container precursor in a flat state provided by an embodiment of the present invention. As illustrated in FIG. 25, the container precursor 002 is formed by folding and then adhering the package sheet 001 of FIG. 17, and has two openings 2001 and 2002 respectively at the upper end and the lower end, namely, a top opening and a bottom opening. Only one sub-folding pattern FP1 is illustrated in FIG. 25.
[0161] In the package sheet, sealed container and container precursor provided by the above embodiments, because the ratio of at least one of the first spacing and the second spacing to the space between the first intersection point and the second intersection point along the longitudinal direction is set to be greater than or equal to 3%, at least one of the first spacing and the second spacing is made lengthened, and the gripping area or the curved crease line is made farther from the end openings, so that when the end openings are activation or sealed, the cross-sectional shape of the sealed container is more approximate to a rectangle or a square, which can improve the sealing performance of the sealed container without affecting the aesthetics.
[0162] The present invention also includes the following contents.
[0163] The embodiments of the present invention provide a package sheet, a sealed container and a container precursor, which can improve the sealing performance of the sealed container without affecting the aesthetics.
[0164] At least one embodiment of the present invention provides a package sheet. The package sheet includes a folding pattern and is configured to be folded along the folding pattern to form a sealed container having a top and a bottom. The package sheet includes: a first crease line that at least partially forms a circumference of the top; a second crease line that at least partially forms a circumference of the bottom; and a sub-folding pattern located between the first crease line and the second crease line along a longitudinal direction, wherein the sub-folding pattern intersects with the first crease line and the second crease line at a first intersection point and a second intersection point, respectively; among them, the sub-folding pattern includes a curved crease line; in the longitudinal direction, a minimum space between the curved crease line and the first intersection point is a first space, and a minimum space between the curved crease line and the second intersection point is a second space, and a ratio of at least one of the first spacing and the second spacing to a space between the first intersection point and the second intersection point along the longitudinal direction is greater than or equal to 3%.
[0165] In at least some embodiments, the ratio of at least one of the first spacing and the second spacing to the space between the first intersection point and the second intersection point along the longitudinal direction is greater than or equal to 7%.
[0166] In at least some embodiments, the ratio of at least one of the first spacing and the second spacing to the space between the first intersection point and the second intersection point along the longitudinal direction is greater than or equal to 8%.
[0167] In at least some embodiments, the ratio of at least one of the first spacing and the second spacing to the space between the first intersection point and the second intersection point along the longitudinal direction is greater than or equal to 10%.
[0168] In at least some embodiments, at least one of the first spacing and the second spacing ranges from 5 mm to 25 mm.
[0169] In at least some embodiments, at least one of the first spacing and the second spacing ranges from 10 mm to 20 mm.
[0170] In at least some embodiments, the sub-folding pattern further includes a first longitudinal crease line and a second longitudinal crease line, wherein the first longitudinal crease line is connected between the curved crease line and the first intersection point along the longitudinal direction, and the second longitudinal crease line is connected between the curved crease line and the second intersection point along the longitudinal direction, and the first longitudinal crease line and the second longitudinal crease line are symmetrically arranged relative to the curved crease line.
[0171] In at least some embodiments, the first longitudinal crease line has a first longitudinal length along the longitudinal direction, and the second longitudinal crease line has a second longitudinal length along the longitudinal direction, and the first longitudinal length is equal to the second longitudinal length.
[0172] In at least some embodiments, there are a plurality of sub-folding patterns, and at least two of the plurality of sub-folding patterns are respectively provided with the curved crease line.
[0173] In at least some embodiments, respective curved crease lines of at least two sub-folding patterns have a same distance from at least one of the first crease line and the second crease line, along the longitudinal direction.
[0174] In at least some embodiments, there are a plurality of sub-folding patterns, and the plurality of sub-folding patterns include at least one first sub-folding pattern and at least one second sub-folding pattern, and the first sub-folding pattern and the second sub-folding pattern are alternately arranged along a transverse direction which is perpendicular to the longitudinal direction; each of the at least one first sub-folding pattern or each of the at least one second sub-folding pattern is provided with the curved crease line.
[0175] In at least some embodiments, there are a plurality of sub-folding patterns, and the plurality of sub-folding patterns intersect with the first crease line at a plurality of first intersection points, and a part of the first crease line located between adjacent two first intersection points has a radian.
[0176] In at least some embodiments, a radius of curvature of the radian ranges from 60 mm to 155 mm, and a width of the radian in the longitudinal direction is greater than 2 mm.
[0177] In at least some embodiments, a width of the curved crease line in a transverse direction ranges from 8 mm to 12 mm, and the transverse direction is perpendicular to the longitudinal direction.
[0178] According to a second aspect of the present invention, a sealed container is provided, and the sealed container is obtained by folding the package sheet according to the folding pattern in the embodiments of the present invention described above.
[0179] In at least some embodiments, the sealed container includes a housing, and the housing includes the top, the bottom and a sidewall connecting the top and the bottom, the top has a top corner and the bottom has a bottom corner, and the sidewall includes a side edge connecting the top corner and the bottom corner along a substantially longitudinal direction; the first intersection point defines the top corner, the second intersection point defines the bottom corner, the sub-folding pattern is formed into the side edge, and the curved crease line is formed into a gripping area located on the side edge.
[0180] In at least some embodiments, the gripping area has a gripping center along the longitudinal direction, and the side edge has a side edge midpoint along the longitudinal direction, and the gripping center coincides with the side edge midpoint.
[0181] In at least some embodiments, there are a plurality of top corners and a plurality of bottom corners, the plurality of bottom corners are in one-to-one correspondence with the plurality of top corners; there are a plurality of side edges, and the plurality of side edges respectively connect the plurality of top corners with the corresponding plurality of bottom corners; at least two of the plurality of side edges are respectively provided with the gripping area.
[0182] In at least some embodiments, the plurality of top corners include two top corners oppositely arranged along a diagonal direction which is parallel to a plane where the bottom is located, and the plurality of bottom corners include two bottom corners oppositely arranged along the diagonal direction and corresponding to the two top corners; the plurality of side edges include two side edges which respectively connect the two top corners with the corresponding two bottom corners; and the two side edges are respectively provided with the gripping area.
[0183] In at least some embodiments, the at least two side edges include a first side edge and a second side edge, and the at least two gripping areas include a first gripping area arranged on the first side edge and a second gripping area arranged on the second side edge; the first gripping area has a first gripping center along the longitudinal direction, and the second gripping area has a second gripping center along the longitudinal direction; the first gripping center and the second gripping area have a same height relative to the bottom.
[0184] In at least some embodiments, the first side edge has a first side edge midpoint along the longitudinal direction, and the second side edge has a second side edge midpoint along the longitudinal direction. The first gripping center coincides with the first side edge midpoint, and the second gripping center coincides with the second side edge midpoint.
[0185] In at least some embodiments, the first gripping area and the second gripping area have a same area or different areas.
[0186] In at least some embodiments, the sealed container further includes a flow guide member which is connected to the top of the housing and configured to guide liquid in the housing to flow out through the flow guide member; the top has an end, the size of the end of the top is gradually decreased along a direction towards the flow guide member, and the top is attached to the flow guide member through the end.
[0187] In at least some embodiments, the flow guide member includes a flow guide nozzle and a flange portion, and an end of the top includes four top side walls which are located around the flange portion and attached to the flange portion.
[0188] According to a third aspect of the present invention, a contain precursor is provided, the container precursor is obtained by folding the package sheet along the folding pattern of the package sheet described above, the container precursor has two end openings.
[0189] Although the preferred embodiments of the present invention have been described, it should be understood that those skilled in the art can make various modifications and variations to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, provided that these modifications and variations of the embodiments of the present invention are within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.
Claims
1.A container precursor, comprising:a container precursor wall, wherein the container precursor wall is composed of a package sheet enclosing an internal area, and the package sheet comprises an inner cover layer, a barrier layer and a carrier layer which are stacked sequentially in a direction away from the internal area;the container precursor wall comprises a longitudinal seam formed by joining two ends of the package sheet;the container precursor wall has a first tensile strength and a first elongation at break in a first direction, and a second tensile strength and a second elongation at break in a second direction, the first direction is a longitudinal direction along which the longitudinal seam extends, and the second direction is a circumferential direction of the container precursor wall which is perpendicular to the longitudinal direction, andthe first tensile strength is smaller than the second tensile strength, and the first elongation at break is greater than the second elongation at break.2.The container precursor according to claim 1, wherein a ratio of the first tensile strength to the second tensile strength is in a range of 0.5-1, and a ratio of the first elongation at break to the second elongation at break is in a range of 1.5-3.3.The container precursor according to claim 1 or 2, wherein the inner cover layer has a third tensile strength and a third elongation at break in the first direction, and the inner cover layer has a fourth tensile strength and a fourth elongation at break in the second direction,the third tensile strength is smaller than the fourth tensile strength, and the third elongation at break is greater than the fourth elongation at break.4.The container precursor according to claim 3, wherein a ratio of the third tensile strength to the fourth tensile strength is in a range of 0.6-1, and a ratio of the third elongation at break to the fourth elongation at break is in a range of 1-2.5.The container precursor according to any one of claims 1, 2 and 4, wherein a material of the carrier layer comprises fiber.6.The container precursor according to any one of claims 1, 2 and 4, wherein the barrier layer comprises a base layer, a reinforcement layer and a protection layer which are arranged in a stacked manner,wherein the base layer is arranged adjacent to the inner cover layer, and the protection layer is arranged adjacent to the carrier layer.7.The container precursor according to claim 6, wherein the barrier layer further comprises a first inorganic oxide layer between the base layer and the inner cover layer, and / or, a second inorganic oxide layer between the protection layer and the carrier layer.8.The container precursor according to claim 6, wherein the reinforcement layer comprises at least one selected from a group consisting of an aluminum oxide layer, a silicon oxide layer and a silicon oxycarbide layer, andthe package sheet further comprises a light-shielding layer between the barrier layer and the carrier layer.9.The container precursor according to claim 8, wherein the package sheet further comprises:a first adhesive layer between the light-shielding layer and the barrier layer, anda second adhesive layer between the barrier layer and the inner cover layer.10.The container precursor according to any one of claims 1, 2, 4 and 7-9, wherein the package sheet further comprises an outer cover layer at a side of the carrier layer away from the inner cover layer.