Packaging container and sealing method and sealing device thereof

Abstract

The invention discloses a packaging container and a sealing method and device thereof. The sealing method comprises the following steps that a preset pressure difference range is determined; according to a preset pressure difference range, the sealing part of the packaging container is subjected to heat sealing, so that at least one first heat sealing combination part and at least one second heat sealing combination part are formed on the sealing part; wherein the at least one first heat-sealing combination part and the at least one second heat-sealing combination part are alternately arranged in the extending direction of the sealing part, and the combination strength of the inner edge parts, close to the inner cavity of the packaging container, of the second heat-sealing combination parts is smaller than that of the first heat-sealing combination parts. And the second heat sealing combination part can be separated to realize pressure relief when the internal and external pressure difference of the packaging container reaches a preset pressure difference range. Other structures do not need to be additionally arranged on the packaging container, other procedures do not need to be additionally arranged, the technical problem of explosion caused by too large internal and external pressure difference after the packaging container is sealed can be solved only through sealing, operation is easy, and cost is low.

Description

Technical Field

[0001] The present invention relates to the technical field of packaging, and in particular to a packaging container and a sealing method and a sealing device thereof. Background Art

[0002] Heat sealing is the best sealing method for common packaging containers (such as cup products in the cold drink industry), which can not only ensure the sealing effect, isolate the product from the outside world, but also be easy to tear. However, during the transportation of the product, the pressure difference between the inside and outside of the product may increase due to differences in altitude, which may cause the product to swell and burst. Summary of the invention

[0003] The purpose of the present invention is to provide a packaging container and a sealing method and a sealing device thereof, so as to solve the technical problem that after the packaging container is sealed, the product may burst due to excessive pressure difference between the inside and outside of the product during product transportation.

[0004] The above-mentioned purpose of the present invention can be achieved by adopting the following technical solutions:

[0005] The present invention provides a method for sealing a packaging container, comprising the following steps: determining a preset pressure difference range; heat-sealing a sealing portion of the packaging container according to the preset pressure difference range, so that the sealing portion forms at least one first heat-sealed joint and at least one second heat-sealed joint; wherein at least one first heat-sealed joint and at least one second heat-sealed joint are alternately arranged in an extension direction of the sealing portion, the bonding strength of the inner edge of the second heat-sealed joint close to the inner cavity of the packaging container is less than the bonding strength of the first heat-sealed joint, and the second heat-sealed joint can be separated to achieve pressure relief when the pressure difference between the inside and outside of the packaging container reaches the preset pressure difference range.

[0006] In an embodiment of the present invention, heat-sealing the sealing part of the packaging container according to the preset pressure difference comprises the following steps: determining a preset pressure range, a preset hot pressing temperature range and a preset hot pressing time range of the pressure head according to the preset pressure difference range; hot-pressing the pressure head on the sealing part according to the preset pressure range, the preset hot pressing temperature range and the preset hot pressing time range, so that the sealing part forms at least one second heat-sealed joint and at least one first heat-sealed joint; wherein the hot-pressing surface of the pressure head is provided with at least one groove, and the area of ​​the sealing part corresponding to the groove is heat-sealed to form the inner edge of the second heat-sealed joint.

[0007] In an embodiment of the present invention, the preset pressure difference range is 12Kpa to 15Kpa, the preset pressure range is 3.5kg to 4.5kg, the preset hot pressing time range is 0.9 seconds to 1.5 seconds, and the preset heat sealing temperature range is 120°C to 210°C.

[0008] In an embodiment of the present invention, hot pressing the pressure head on the sealing part according to the preset pressure range, the preset hot pressing temperature range and the preset hot pressing time range includes the following steps: heating the pressure head to the preset hot pressing temperature range; selecting a hot pressing time within the preset hot pressing time range according to the production speed; selecting a hot pressing temperature within the preset hot pressing temperature range according to the hot pressing time, and adjusting the pressure head to the hot pressing temperature; within the preset pressure range, hot pressing the pressure head adjusted to the hot pressing temperature on the sealing part, and after continuing the hot pressing time, separating the pressure head from the sealing part.

[0009] The present invention also provides a sealing device for a packaging container, comprising a pressure head, wherein the hot pressing surface of the pressure head is provided with at least one groove and at least one first hot pressing plane, the at least one groove and the at least one first hot pressing plane are alternately arranged in the extension direction of the sealing part of the packaging container, and the groove is opened on the inner edge portion of the hot pressing surface close to the inner cavity of the packaging container.

[0010] In an embodiment of the present invention, a hot pressing slope is provided in the groove, and the hot pressing slope extends obliquely from the inner edge to the outer edge in the hot pressing direction.

[0011] In an embodiment of the present invention, the hot pressing surface is provided with at least one second hot pressing plane surface, and the second hot pressing plane surface is connected to the outer edge of the hot pressing slope surface.

[0012] In an embodiment of the present invention, the hot pressing surface is an annular hot pressing surface, and the number of the grooves is multiple, and the multiple grooves are opened on the inner ring edge of the annular hot pressing surface and are arranged at intervals along the circumference of the annular hot pressing surface.

[0013] The present invention also provides a packaging container, whose sealing portion is heat-sealed to form at least one second heat-sealed joint and at least one first heat-sealed joint, and the at least one second heat-sealed joint and at least one first heat-sealed joint are alternately arranged in the extension direction of the sealing portion, and the bonding strength of the inner edge portion of the second heat-sealed joint close to the inner cavity of the packaging container is less than the bonding strength of the first heat-sealed joint, and the second heat-sealed joint can be separated to achieve pressure relief when the pressure difference between the inside and outside of the packaging container reaches a preset pressure difference range.

[0014] In an embodiment of the present invention, the bonding strength of the inner edge portion of the second heat-sealed bonding portion is gradually increased from the inside to the outside; the bonding strength of the outer edge portion of the second heat-sealed bonding portion away from the inner cavity of the packaging container is less than or equal to the bonding strength of the first heat-sealed bonding portion.

[0015] In an embodiment of the present invention, the packaging container comprises a container body and a sealing film, the container body is provided with an opening, the sealing film covers the opening, and the sealing portion is formed by the portion where the sealing film fits the edge around the opening.

[0016] In an embodiment of the present invention, the number of the second heat-sealed bonding parts and the number of the first heat-sealed bonding parts are both plural, and the plural second heat-sealed bonding parts and the plural first heat-sealed bonding parts are alternately arranged in the circumferential direction of the opening.

[0017] In an embodiment of the present invention, a pressing cover is covered on the container body, and the pressing cover is pressed on the sealing film.

[0018] The characteristics and advantages of the present invention are:

[0019] The sealing method and packaging container of the packaging container of the present invention heat-seal the sealing part of the packaging container according to a preset pressure difference range, so that the sealing part is heat-sealed to form a second heat-sealed joint part and a first heat-sealed joint part which are alternately arranged in the extension direction thereof; since the bonding strength of the inner edge part of the second heat-sealed joint part is lower than the bonding strength of the first heat-sealed joint part, when the internal and external pressure difference of the packaging container does not reach the preset pressure difference range, the sealing part of the packaging container can maintain a complete seal under the sealing of the second heat-sealed joint part and the first heat-sealed joint part; when the internal and external pressure difference of the packaging container reaches the preset pressure difference, the gas in the packaging container will first push open and separate the inner edge part of the second heat-sealed joint part and continue to squeeze the outer edge part of the second heat-sealed joint part, so that the second heat-sealed joint part can be separated to form a pressure relief port to achieve pressure relief, thereby avoiding the packaging container from bursting due to excessive internal and external pressure difference, and the sealing part of the packaging container can still continue to maintain a certain degree of sealing under the sealing of the first heat-sealed joint part. Therefore, the present invention does not need to add other connections on the packaging container, nor does it need to add other processes. The technical problem of explosion caused by excessive internal and external pressure difference after the packaging container is sealed can be solved by sealing alone. The operation is simple and the cost is low.

[0020] In the sealing device for the packaging container of the present invention, after the hot pressing surface is hot pressed on the sealing part of the packaging container, the hot pressing pressure received by the area corresponding to the groove on the sealing part is smaller than the hot pressing pressure received by the area corresponding to the first hot pressing plane on the sealing part. Therefore, the bonding strength of the inner edge portion of the second heat-sealed joint formed by the area corresponding to the groove on the sealing part is lower than the bonding strength of the first heat-sealed joint formed by the area corresponding to the first hot pressing plane on the sealing part. There is no need to control the heat sealing parameters separately for hot pressing in order to heat-seal the second heat-sealed joint and the first heat-sealed joint to form different bonding strengths. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0022] Figure 1 It is a schematic structural diagram of the sealing device in the present invention.

[0023] Figure 2 It is a schematic structural diagram of the hot pressing surface of the hot pressing head in the present invention.

[0024] Figure 3 It is a schematic structural diagram of the first heat-sealed joint formed by heat sealing in the present invention.

[0025] Figure 4 It is a schematic structural diagram of the second heat-sealed joint formed by heat sealing in the present invention.

[0026] In the figure:

[0027] 100, sealing device; 11, power output mechanism; 12, temperature control mechanism; 13, pressure head; 131, first hot pressing plane; 132, groove; 133, hot pressing slope; 134, second hot pressing plane; 14, bottom support;

[0028] 200, packaging container; 21, container body; 211, cup edge; 22, sealing film; 23, first heat-sealed joint; 24, second heat-sealed joint; 241, inner edge of the second heat-sealed joint; 242, outer edge of the second heat-sealed joint. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Implementation Method 1

[0031] like Figure 1 As shown, the present invention provides a sealing method for a packaging container 200, comprising the following steps: determining a preset pressure difference range; heat-sealing a sealing portion of the packaging container 200 according to the preset pressure difference range, so that the sealing portion forms at least one first heat-sealed joint 23 (such as Figure 3 and at least one second heat-sealed joint 24 (as shown Figure 4 wherein at least one first heat-sealed joint 23 and at least one second heat-sealed joint 24 extend in the direction S of the sealing portion (as shown in FIG. Figure 3 The second heat-sealed joint 24 is alternately arranged on the upper surface of the packaging container 200, the bonding strength of the inner edge portion 241 of the second heat-sealed joint 24 close to the inner cavity of the packaging container 200 is less than the bonding strength of the first heat-sealed joint 23, and the second heat-sealed joint 24 can be separated to achieve pressure relief when the pressure difference between the inside and outside of the packaging container 200 reaches a preset pressure difference range.

[0032] The sealing method of the packaging container 200 of the present invention heat-seals the sealing part of the packaging container 200 according to a preset pressure difference range, so that the sealing part is heat-sealed to form a second heat-sealed joint part 24 and a first heat-sealed joint part 23 arranged alternately along the extension direction S thereof. Since the bonding strength of the inner edge part 241 of the second heat-sealed joint part is lower than the bonding strength of the first heat-sealed joint part 23, when the internal and external pressure difference of the packaging container 200 does not reach the preset pressure difference range, the sealing part of the packaging container 200 can be sealed at the second heat-sealed joint part 24 and the first heat-sealed joint part 23. 23; when the internal and external pressure difference of the packaging container 200 reaches the preset pressure difference range, the gas in the packaging container 200 will first push the inner edge 241 of the second heat-sealed joint 24 apart and continue to squeeze the outer edge 242 of the second heat-sealed joint 24, so that the second heat-sealed joint 24 can be separated to form a pressure relief port to achieve pressure relief, thereby preventing the packaging container 200 from bursting due to excessive internal and external pressure difference, and the sealed portion of the packaging container 200 can still maintain a certain degree of sealing under the sealing of the first heat-sealed joint 23. Therefore, the present invention does not need to add other structures to the packaging container 200, nor does it need to add other processes. The technical problem of the packaging container 200 bursting due to excessive internal and external pressure difference after sealing can be solved by sealing only, and the operation is simple and the cost is low.

[0033] Combination Figure 3 and Figure 4 As shown, the bonding strength of the outer edge portion 242 of the second heat-sealed bond 24 may not be specifically limited, as long as the gas pushes open and separates the inner edge portion 241 of the second heat-sealed bond when the pressure difference between the inside and outside of the packaging container 200 reaches a preset pressure difference range, it may be equal to the bonding strength of the first heat-sealed bond 23, or it may be less than the bonding strength of the first heat-sealed bond 23.

[0034] like Figure 1 As shown, the packaging container 200 can be a packaging cup, a packaging barrel, a packaging box, a packaging bag or other packaging containers. The inner cavity of the packaging container 200 is preferably filled with solids, such as ice cream, but can also be filled with liquids, as long as the opening of the packaging container 200 is placed upward after the second heat-sealed joint 24 is separated. At least one first heat-sealing joint 23 and at least one second heat-sealing joint 24 are alternately arranged in the extension direction S of the sealing part, specifically, the inner edge of the second heat-sealing joint 24 and the inner edge of the first heat-sealing joint 23 are both in contact with the gas in the inner cavity of the packaging container 200. Therefore, when the pressure difference between the inside and outside of the packaging container 200 increases, the second heat-sealing joint 24 and the first heat-sealing joint 23 will be squeezed by the internal gas. However, since the bonding strength of the inner edge 241 of the second heat-sealing joint is lower than that of the first heat-sealing joint 23, they will be pushed open and separated in advance by the gas. Then, when the pressure difference between the inside and outside of the packaging container 200 continues to increase, the gas will continue to gather at the inner edge 241 of the second heat-sealing joint 24 and continue to squeeze the outer edge 242 of the second heat-sealing joint, until the pressure difference between the inside and outside of the packaging container 200 increases to the preset pressure difference range, and the outer edge 242 of the second heat-sealing joint 24 is also pushed open and separated, thereby forming a pressure relief port for pressure relief.

[0035] like Figure 1 As shown, in an embodiment of the present invention, the packaging container 200 is a packaging cup, including a cup body (i.e., a container body 21) and a sealing film 22. The cup body is provided with an opening, and the sealing film 22 covers the opening. The portion where the sealing film 22 and the edge around the opening (i.e., the cup edge 211) are in contact forms a sealing portion. The extending direction of the sealing portion is the circumferential direction of the opening. At least one second heat-sealed joint 24 and at least one first heat-sealed joint 23 are alternately arranged along the circumferential direction of the opening.

[0036] In addition, in the embodiment of the present invention, after the sealing film 22 is heat-sealed on the cup edge 211, a pressure cap is covered on the container body 21, and the pressure cap can press down the sealing film 22. When the internal and external pressure difference of the packaging container 200 reaches the preset pressure difference range, the internal gas of the packaging container 200 first breaks the second heat-sealed joint 24, and then overcomes the pressure of the pressure cap, so that the gas leaks out from the gap between the pressure cap and the container body 21. Therefore, when the internal and external pressure difference is balanced again, the second heat-sealed joint 24 can be re-attached to seal the pressure relief port under the pressure of the pressure cap. Therefore, even after the pressure relief, in the present invention, when there is no internal and external pressure difference or the internal and external pressure difference is small, the sealing part of the packaging container 200 can still be sealed by the first heat-sealed joint 23 and the second heat-sealed joint 23, and the external air will not enter the interior of the packaging container 200.

[0037] Specifically, the number of the first heat-sealing joint 23 and the number of the second heat-sealing joint 24 are both multiple. The bonding strength of the outer edge portion 242 of the second heat-sealing joint is equal to the bonding strength of the first heat-sealing joint 23. The cup body is a paper cup body. The packaging container 200 is used to package ice cream.

[0038] In another embodiment of the present invention, the packaging container 200 is a packaging bag, and the open ends of the packaging bag are pressed together to form a sealing portion, and the extension direction of the sealing portion is the length direction of the opening end, that is, the perpendicular direction of the depth direction of the inner cavity of the packaging bag, and at least one second heat-sealed joint 24 and at least one first heat-sealed joint 23 are alternately arranged along the length direction of the opening end.

[0039] like Figure 1 As shown, the sealing method of the present invention can be implemented using a sealing device 100. In an embodiment of the present invention, the sealing device 100 includes a power output mechanism 11, a temperature control mechanism 12, a pressure head 13 and a base 14. The packaging container 200 can be placed on the base 14. The temperature control mechanism 12 is installed at the active end of the power output mechanism 11. The pressure head 13 is installed on the temperature control mechanism 12. The temperature control mechanism 12 can heat the pressure head 13. The active end of the power output mechanism 11 can drive the pressure head 13 on the temperature control mechanism 12 to move along the hot pressing direction D to the sealing part for hot pressing until the sealing part is heat-sealed. The active end of the power output mechanism 11 can drive the pressure head 13 on the temperature control mechanism 12 to move in the opposite direction of the hot pressing direction D and separate from the sealing part.

[0040] Specifically, the power output mechanism 11 includes a driving structure, a mounting frame and a guide member. The driving structure can be a telescopic cylinder, an electric telescopic rod and other structures. The driving structure is installed on the mounting frame, and the movable end of the driving structure slides with the guide member along the hot pressing direction D. The temperature control mechanism 12 includes a temperature controller, a heating rod, a temperature sensing head and a heat conducting block. The more specific structures of the temperature control mechanism 12 and the power output mechanism 11 are the same as those in the prior art and will not be repeated here.

[0041] Combination Figure 2 As shown, in the embodiment of the present invention, the sealing method of the present invention can be implemented by simply modifying the pressure head 13 of the sealing device 100. Specifically, according to the preset pressure difference range, the preset pressure range, the preset hot pressing temperature range and the preset hot pressing time range of the pressure head 13 are determined; according to the preset pressure range, the preset hot pressing temperature range and the preset hot pressing time range, the pressure head 13 is hot pressed on the sealing part, so that the sealing part forms at least one second heat-sealed joint 24 and at least one first heat-sealed joint 23.

[0042] Combination Figure 2 , Figure 3 as well as Figure 4 As shown, the hot pressing surface of the pressing head 13 is provided with at least one groove 132, and the area of ​​the sealing part corresponding to the groove 132 is heat-sealed to form the inner edge portion 241 of the second heat-sealed joint. The two ends of the groove 132 in the extension direction S of the sealing part are connected to the first hot pressing plane 131, so that after the hot pressing surface is hot-pressed on the sealing part, the area of ​​the sealing part corresponding to the groove 132 is subjected to a smaller hot pressing pressure, thereby forming the inner edge portion 241 of the second heat-sealed joint with a smaller bonding strength, while the area of ​​the sealing part corresponding to the first hot pressing plane 131 is subjected to a larger hot pressing pressure, thereby forming the first heat-sealed joint 23 with a larger bonding strength.

[0043] like Figure 4 As shown, further, in order to better guide the internal gas to find the second heat-sealed joint 24 when the pressure difference between the inside and outside of the packaging container 200 increases, a hot pressing slope 133 is set in the groove 132, and the hot pressing slope 133 is inclined and extends from its inner edge to its outer edge in the hot pressing direction D, so that the hot pressing pressure on the area where the sealing part contacts the hot pressing slope 133 gradually increases from its inner edge to its outer edge. Therefore, the closer the area is to the inner cavity of the packaging container 200, the lower the bonding strength is. Therefore, when the pressure difference between the inside and outside increases, the internal gas can be guided to better find the part with the lowest bonding strength, thereby ensuring that after the pressure difference between the inside and outside increases to the preset pressure difference, the second heat-sealed joint 24 is pushed open and separated by the internal gas to achieve pressure relief.

[0044] like Figure 2 and Figure 4 As shown, in the embodiment of the present invention, the hot pressing surface is further provided with a second hot pressing plane 134, and the second hot pressing plane 134 is connected to the outer edge of the hot pressing slope surface 133. The hot pressing pressure on the sealing portion corresponding to the second hot pressing plane 134 is also relatively large, thereby forming an outer edge portion 242 of the second heat sealing joint 24 with a bonding strength equal to that of the first heat sealing joint 23. Specifically, the hot pressing surface is an annular hot pressing surface, and the number of the grooves 132 is multiple, and the multiple grooves 132 are opened on the inner ring edge of the annular hot pressing surface and are arranged at intervals along the circumference of the annular hot pressing surface.

[0045] In another embodiment of the present invention, the second hot pressing plane 134 is not set, and at least one hot pressing slope 133 is alternately arranged with the first hot pressing plane 131 in the extension direction of the sealing part, and the part of the sealing part that is hot pressed by the hot pressing slope 133 forms a second heat sealing joint 24 whose bonding strength gradually increases from the inside to the outside.

[0046] In the embodiment of the present invention, the preset pressure difference range is 12Kpa to 15Kpa. In the embodiment of the present invention, when the sealed packaging container 200 is transported to an environment with an atmospheric pressure lower than 84Kpa, the internal and external pressure difference of the packaging container 200 reaches 12Kpa to 15Kpa, and the second heat-sealed joint 24 is pushed open and separated to release pressure.

[0047] The preset pressure range is 3.5kg to 4.5kg, the preset hot pressing time range is 0.9 seconds to 1.5 seconds, and the preset heat sealing temperature range is 120°C to 210°C. The preset pressure range is the pressure provided by the power output mechanism 11. The larger the preset pressure range, the greater the hot pressing pressure of the hot pressing surface of the pressure head 13 acting on the sealing part, and the higher the heat sealing bonding strength. Conversely, the lower the heat sealing bonding strength.

[0048] Furthermore, in order to improve the reliability of heat sealing of the first heat sealing joint 23 and pressure relief of the second heat sealing joint 24 after the internal and external pressure difference reaches a preset pressure difference range, the preset pressure can be adjusted within the preset pressure range; and / or the preset hot pressing time can be adjusted within the preset hot pressing time range; and / or the preset hot pressing temperature can be adjusted within the preset hot pressing temperature range.

[0049] In addition, in order to make the production speed of the sealing process consistent or close to that of the upstream process, the hot pressing parameters can be adjusted according to the production speed.

[0050] As in some embodiments of the present invention, the pressure head 13 is hot pressed on the sealing part according to a preset pressure range, a preset hot pressing temperature range and a preset hot pressing time range, comprising the following steps: heating the pressure head 13 to a preset hot pressing temperature range; selecting a hot pressing time within the preset hot pressing time range according to the production speed; selecting a hot pressing temperature within the preset hot pressing temperature range according to the hot pressing time, and adjusting the pressure head 13 to the hot pressing temperature; hot pressing the pressure head 13 on the sealing part within the preset pressure range, and separating the pressure head 13 from the sealing part after the hot pressing time.

[0051] Some preferred embodiments of the present invention are provided below, as shown in the following table:

[0052] Production speed Hot pressing time Hot pressing temperature Preferred embodiment 1 20 rows / minute 1.5 seconds 120℃ Preferred embodiment 2 21 rows / minute 1.4 seconds 135℃ Preferred embodiment three 22 rows / minute 1.3 seconds 150℃ Preferred embodiment 4 23 rows / minute 1.2 seconds 165℃ Preferred embodiment five 24 rows / minute 1.1 seconds 180℃ Preferred embodiment six 25 rows / minute 1.0 sec 195℃ Preferred embodiment seven 26 rows / minute 0.9 seconds 210℃

[0053] In some other embodiments of the present invention, different areas of the sealing part can be hot pressed under different hot pressing parameters, so that the sealing part is hot pressed to form at least one first heat-sealed part and at least one second heat-sealed part. Optionally, the hot pressing time when the first heat-sealed part is hot pressed is higher than the hot pressing time when the inner edge of the second heat-sealed part is hot pressed, so that the bonding strength of the inner edge of the second heat-sealed part is lower than the bonding strength of the first heat-sealed part. Optionally, the hot pressing temperature when the first heat-sealed part is hot pressed is higher than the hot pressing temperature when the inner edge of the second heat-sealed part is hot pressed, so that the bonding strength of the inner edge of the second heat-sealed part is lower than the bonding strength of the first heat-sealed part.

[0054] Implementation Method 2

[0055] like Figure 1 and Figure 2 As shown, the present invention further provides a sealing device 100 for a packaging container 200, comprising a pressure head 13, on which a hot pressing surface of the pressure head 13 is provided at least one groove 132 and at least one first hot pressing plane 131, the at least one groove 132 and the at least one first hot pressing plane 131 are alternately arranged in the extension direction S of the sealing portion of the packaging container 200, and the groove 132 is provided on the inner edge of the hot pressing surface close to the inner cavity of the packaging container 200. The sealing device 100 in this embodiment has the same specific structure and working principle as the sealing device 100 in the first embodiment, which will not be described in detail herein.

[0056] Combination Figure 3 and Figure 4 As shown, in the sealing device 100 of the packaging container 200 of the present invention, after the hot pressing surface is hot pressed on the sealing part of the packaging container 200, the hot pressing pressure received by the area corresponding to the groove 132 on the sealing part is smaller than the hot pressing pressure received by the area corresponding to the first hot pressing plane 131 of the sealing part. Therefore, the bonding strength of the inner edge portion 241 of the second heat-sealed joint formed by the area corresponding to the groove 132 on the sealing part is lower than the bonding strength of the first heat-sealed joint 23 formed by the area corresponding to the first hot pressing plane 131 of the sealing part, and there is no need to control the heat sealing parameters for hot pressing respectively in order to heat seal the second heat-sealed joint 24 and the first heat-sealed joint 23.

[0057] Combination Figure 2 and Figure 4 As shown, in the embodiment of the present invention, a hot pressing slope 133 is provided in the groove 132 , and the hot pressing slope 133 is inclined and extends from the inner edge thereof to the outer edge thereof in the hot pressing direction.

[0058] Combination Figure 2 and Figure 4 As shown, in the embodiment of the present invention, the hot pressing surface is provided with at least one second hot pressing plane 134 , and the second hot pressing plane 134 is connected to the outer edge of the hot pressing slope surface 133 .

[0059] Combination Figure 2 As shown, in an embodiment of the present invention, the hot pressing surface is an annular hot pressing surface, and the number of grooves 132 is multiple, and the multiple grooves 132 are opened on the inner ring edge of the annular hot pressing surface and are arranged at intervals along the circumference of the annular hot pressing surface.

[0060] Implementation Method 3

[0061] Combination Figure 3 and Figure 4 As shown, the present invention further provides a packaging container 200, wherein the sealing portion is heat-sealed to form at least one second heat-sealed joint 24 and at least one first heat-sealed joint 23, and the at least one second heat-sealed joint 24 and the at least one first heat-sealed joint 23 are in the extension direction S of the sealing portion (such as Figure 2 The second heat-sealed joint 24 is alternately arranged on the packaging container 200, the bonding strength of the inner edge of the inner cavity of the second heat-sealed joint 24 close to the packaging container 200 is less than the bonding strength of the first heat-sealed joint 23, and the second heat-sealed joint 24 can be separated to achieve pressure relief when the pressure difference between the inside and outside of the packaging container 200 reaches a preset pressure difference range. The specific structure, working principle and beneficial effects of the packaging container 200 in this embodiment are the same as those of the packaging container 200 after heat sealing in the first embodiment, and will not be repeated here.

[0062] like Figure 2 , Figure 3 and Figure 4 As shown, in an embodiment of the present invention, the bonding strength of the inner edge portion 241 of the second heat-sealing bonding portion 24 is gradually increased from the inside to the outside; the bonding strength of the outer edge portion of the second heat-sealing bonding portion 24 away from the inner cavity of the packaging container 200 is less than or equal to the bonding strength of the first heat-sealing bonding portion 23.

[0063] like Figure 1 As shown, in the embodiment of the present invention, the packaging container 200 includes a container body 21 and a sealing film 22. The container body 21 is provided with an opening, and the sealing film 22 covers the opening. The sealing portion is formed by the portion where the sealing film 22 fits the edge around the opening.

[0064] like Figure 2 , Figure 3 and Figure 4 As shown, in the embodiment of the present invention, the number of the second heat-sealing bonding parts 24 and the number of the first heat-sealing bonding parts 23 are both multiple, and the multiple second heat-sealing bonding parts 24 and the multiple first heat-sealing bonding parts 23 are alternately arranged in the circumferential direction of the opening.

[0065] The above are only several embodiments of the present invention. Those skilled in the art may make various changes or modifications to the embodiments of the present invention based on the contents disclosed in the application documents without departing from the spirit and scope of the present invention.

Claims

1. A method for sealing a packaging container, characterized in that: The following steps are involved: Determine the preset differential pressure range; According to the preset pressure difference range, heat-seal the sealing part of the packaging container so that the sealing part forms at least one first heat-seal joint part and at least one second heat-seal joint part; Among them, at least one of the first heat-sealed joints and at least one of the second heat-sealed joints are alternately arranged in the extension direction of the sealing portion, the bonding strength of the inner edge of the second heat-sealed joint close to the inner cavity of the packaging container is smaller than the bonding strength of the first heat-sealed joint, and the second heat-sealed joint can be separated to achieve pressure relief when the pressure difference between the inside and outside of the packaging container reaches the preset pressure difference range.

2. The method for sealing a packaging container according to claim 1, characterized in that: The step of heat-sealing the sealing portion of the packaging container according to the preset pressure difference comprises the following steps: According to the preset pressure difference range, determining the preset pressure range of the pressure head, the preset hot pressing temperature range and the preset hot pressing time range; According to the preset pressure range, the preset hot pressing temperature range and the preset hot pressing time range, the pressing head is hot pressed on the sealing part, so that the sealing part forms at least one second heat-sealed joint part and at least one first heat-sealed joint part; The hot pressing surface of the pressing head is provided with at least one groove, and the area of ​​the sealing portion corresponding to the groove is heat-sealed to form the inner edge of the second heat-sealed joint.

3. The method for sealing a packaging container according to claim 2, characterized in that: The preset pressure difference range is 12Kpa to 15Kpa, the preset pressure range is 3.5kg to 4.5kg, the preset hot pressing time range is 0.9 seconds to 1.5 seconds, and the preset heat sealing temperature range is 120°C to 210°C.

4. The method for sealing a packaging container according to claim 2, wherein: The step of hot pressing the pressing head on the sealing part according to the preset pressure range, the preset hot pressing temperature range and the preset hot pressing time range comprises the following steps: Heating the pressing head to the preset hot pressing temperature range; According to the production speed, a hot pressing time is selected within the preset hot pressing time range; According to the hot pressing time, a hot pressing temperature is selected within the preset hot pressing temperature range, and the pressing head is adjusted to the hot pressing temperature; Within the preset pressure range, the pressing head adjusted to the hot pressing temperature is hot pressed on the sealing part, and after the hot pressing time is continued, the pressing head is separated from the sealing part.

5. A sealing device for a packaging container, characterized in that: It includes a pressure head, the hot pressing surface of the pressure head is provided with at least one groove and at least one first hot pressing plane, the at least one groove and at least one first hot pressing plane are alternately arranged in the extension direction of the sealing part of the packaging container, and the groove is opened on the inner edge of the hot pressing surface close to the inner cavity of the packaging container.

6. The sealing device for a packaging container according to claim 5, characterized in that: A hot pressing slope is arranged in the groove, and the hot pressing slope extends obliquely from the inner edge to the outer edge in the hot pressing direction.

7. The sealing device for a packaging container according to claim 6, characterized in that: The hot pressing surface is provided with at least one second hot pressing plane surface, and the second hot pressing plane surface is connected to the outer edge of the hot pressing slope surface.

8. The sealing device for a packaging container according to claim 5, characterized in that: The hot pressing surface is an annular hot pressing surface, and the number of the grooves is multiple. The multiple grooves are opened on the inner ring edge of the annular hot pressing surface and are arranged at intervals along the circumference of the annular hot pressing surface.

9. A packaging container, characterized in that: Its sealing portion is heat-sealed to form at least one second heat-sealed joint and at least one first heat-sealed joint, and at least one second heat-sealed joint and at least one first heat-sealed joint are alternately arranged in the extension direction of the sealing portion, and the bonding strength of the inner edge of the second heat-sealed joint close to the inner cavity of the packaging container is less than the bonding strength of the first heat-sealed joint, and the second heat-sealed joint can be separated to achieve pressure relief when the pressure difference between the inside and outside of the packaging container reaches a preset pressure difference range.

10. The packaging container according to claim 9, characterized in that The bonding strength of the inner edge of the second heat-sealed joint is gradually increased from the inside to the outside; the bonding strength of the outer edge of the second heat-sealed joint away from the inner cavity of the packaging container is less than or equal to the bonding strength of the first heat-sealed joint.

11. The packaging container according to claim 9 or 10, characterized in that: The packaging container comprises a container body and a sealing film, wherein the container body is provided with an opening, the sealing film covers the opening, and the sealing portion is formed by the portion where the sealing film fits the edge around the opening.

12. The packaging container according to claim 11, characterized in that The number of the second heat-sealing bonding parts and the number of the first heat-sealing bonding parts are both multiple, and the multiple second heat-sealing bonding parts and the multiple first heat-sealing bonding parts are alternately arranged in the circumferential direction of the opening.

13. The packaging container according to claim 11, characterized in that The container body is covered with a pressing cover, and the pressing cover is pressed on the sealing film.

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