Easy-to-pull sealing gasket and manufacturing method

Abstract

The invention discloses an easy-to-pull sealing gasket and a manufacturing method, and relates to the technical field of sealing gaskets, the easy-to-pull sealing gasket comprises an easy-to-pull layer, an aluminum foil layer and a heat sealing film layer, the easy-to-pull layer is provided with a pull lug, the easy-to-pull layer is provided with a cutting line, the cutting line divides the easy-to-pull layer into an outer ring and an inner ring, the pull lug is connected with the inner ring, and the side edge of the pull lug is connected with the cutting line, the easy-to-pull layer comprises a printing base layer, a foaming layer and a polymer film layer which are sequentially arranged and compounded; compounding the aluminum foil layer with the polymeric membrane layer; one side of the heat-sealing film layer is compounded with the aluminum foil layer, and the other side of the heat-sealing film layer is used for being attached to the end face of the opening of the container to complete sealing. According to the easy-to-pull sealing gasket and the manufacturing method, the gasket layers are combined more firmly, opening of the sealing opening by tearing the pull lugs is not affected, and wrinkles are not prone to being generated when the layers of the gasket are compounded.

Description

Technical Field

[0001] The present invention relates to the technical field of sealing gaskets, and in particular to an easy-pull sealing gasket and a manufacturing method thereof. Background Art

[0002] After filling, medicine bottles, motor oil bottles, milk powder cans and other containers generally need to be sealed with a sealing layer at the opening of the container. In order to facilitate the opening of the sealing layer, there are some gaskets with a pull ear structure. By pulling the pull ear, the inner ring of the gasket can crack along the cutting line, and drive the aluminum foil layer and the heat-sealing film layer adhered to it to break, so as to open the seal.

[0003] However, in the current easy-to-pull gasket structure, the bonding between the layers is not firm. Sometimes when the pull ear is pulled, the aluminum foil layer and the heat-sealing film layer are not pulled apart yet, and the gasket layers are separated, resulting in the failure of the easy-to-pull structure. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides an easy-to-pull sealing gasket, which has a stronger bond between gasket layers and does not affect the opening of the seal by tearing the pull ear.

[0005] The invention also provides a method for manufacturing the easy-to-pull sealing gasket.

[0006] The easy-pull sealing gasket according to the first embodiment of the present invention is used to seal the opening of a container, comprising an easy-pull layer, the easy-pull layer is provided with a pull ear, the easy-pull layer is provided with a cut-off line, the cut-off line divides the easy-pull layer into an outer ring and an inner ring, the pull ear is connected to the inner ring, and the side of the pull ear is connected to the cut-off line, wherein the easy-pull layer comprises a printed base layer, a foaming layer and a polymer film layer which are arranged and compounded in sequence; An aluminum foil layer, the aluminum foil layer is composited with the polymer film layer; A heat-sealing film layer, one side of which is compounded with the aluminum foil layer, and the other side of which is used to fit the end surface of the opening of the container to complete the sealing.

[0007] The easy-to-pull sealing gasket according to the embodiment of the present invention has at least the following beneficial effects: by controlling the thickness of the foaming layer, the thickness of the entire gasket can be controlled, and the thickness of the gasket can be easily adjusted to the designed value; the foaming layer is also used to improve the structural strength of the pull ear, reducing the risk of abnormal breakage of the pull ear when the pull ear is torn; the heat-sealing film layer is used to fit the opening of the container, and is tightly adhered to the container after heat sealing to achieve a sealing effect; a polymer film layer is provided between the foaming layer and the aluminum foil layer, and when the gasket is heat-sealed to the container opening, the polymer film layer will also be in a semi-melted state due to the high temperature, and the polymer film layer will firmly adhere the foaming layer to the aluminum foil layer, further improving the interlayer bonding strength.

[0008] According to some embodiments of the present invention, the printing base layer includes a first film layer and a second film layer, the first film layer and the second film layer are made of the same material, the first film layer is used for printing patterns, the first film layer is composited with the second film layer, and the second film layer is composited with the foaming layer.

[0009] According to some embodiments of the present invention, the easy-to-pull layer further includes a third film layer, and the third film layer is disposed between the foaming layer and the polymer film layer.

[0010] According to the method for manufacturing an easy-pull sealing gasket according to the second aspect of the present invention, the easy-pull sealing gasket is manufactured by the following steps: Step S1, compounding the printed base layer and the foaming layer to obtain a first semi-finished product, and ripening the first semi-finished product; Step S2, compounding the third film layer and the polymer film layer to obtain a second semi-finished product, and ripening the second semi-finished product; Step S3, compounding the first semi-finished product with the second semi-finished product, combining the foaming layer with the third film layer during compounding to obtain a third semi-finished product, and ripening the third semi-finished product; Step S4, setting a plurality of pull ear regions on the surface of one side of the third semi-finished product having the polymer film layer, coating each pull ear region with a stripping varnish and curing it, and die-cutting the third semi-finished product to form pull ears and cutting lines to obtain an easy-to-pull layer; Step S5, compounding the aluminum foil layer and the heat-sealing film layer to obtain a fourth semi-finished product, and aging the fourth semi-finished product; Step S6, compounding the easy-pull layer with the fourth semi-finished product, combining the polymer film layer with the aluminum foil layer during compounding, aging after compounding, and die-cutting after aging to obtain a plurality of easy-pull sealing gaskets, and each easy-pull sealing gasket has the pull ear.

[0011] According to the manufacturing method of the easy-pull sealing gasket of the embodiment of the present invention, there are at least the following beneficial effects: the printed base layer and the foaming layer are composited, and the printed pattern can be displayed on the surface of the foaming film layer; the third film layer is first composited with the polymer film layer, and then composited with the foaming layer through the third film layer, which can first increase the thickness of the polymer film layer, and when composited, can improve the flatness of the product; the pull ear area is coated with peeling varnish and cured, and when the polymer film layer is composited with the aluminum foil layer, the pull ear area has the cured peeling varnish, so that the pull ear structure will not adhere to the aluminum foil layer, and the pull ear is easy to lift; by introducing the polymer film layer between the foaming layer and the aluminum foil layer, the polymer film layer can improve the bonding strength between the foaming layer and the aluminum foil layer, and reduce the risk of failure of the easy-pull structure due to separation of the easy-pull layer and the aluminum foil layer.

[0012] According to some embodiments of the present invention, in step S1, before the printed base layer is compounded with the foaming layer, a pattern is first printed on the surface of the first film layer, and then the first film layer is compounded with the second film layer, and during the compounding, the side of the first film layer printed with the pattern is located between the first film layer and the second film layer, and a fifth semi-finished product is obtained after the compounding, and the fifth semi-finished product is matured.

[0013] According to some embodiments of the present invention, before the second film layer is composited with the first film layer, both side surfaces of the second film layer are subjected to corona treatment, and it is ensured that the dyne values ​​of both side surfaces of the second film layer are greater than or equal to 38.

[0014] According to some embodiments of the present invention, in step S2, before the third film layer is compounded with the polymer film layer, both side surfaces of the polymer film layer are subjected to corona treatment, and the dyne value of the surface on one side where the polymer film layer is combined with the third film layer is greater than or equal to 48, and the dyne value of the surface on the other side of the polymer film layer is greater than or equal to 38.

[0015] According to some embodiments of the present invention, in step S5, when the aluminum foil layer is compounded with the heat-sealing film layer, the aluminum foil layer is compounded with the heat-sealing film layer with adhesive.

[0016] According to some embodiments of the present invention, in step S1, when the printed base layer is compounded with the foaming layer, the printed base layer is compounded with the foaming layer with adhesive.

[0017] According to some embodiments of the present invention, in step S3, when the first semi-finished product is compounded with the second semi-finished product, the third film layer adhesive is compounded with the foaming layer.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 It is a top view of the easy-pull sealing gasket according to an embodiment of the present invention; Figure 2 The figure is a schematic cross-sectional view of the easy-to-pull sealing gasket according to an embodiment of the present invention.

[0020] Figure Number: The easy-to-pull layer 100 , the pull ear 101 , the printed base layer 110 , the first film layer 111 , the second film layer 112 , the foaming layer 120 , the polymer film layer 130 , the third film layer 140 , the aluminum foil layer 200 , and the heat-sealing film layer 300 . DETAILED DESCRIPTION

[0021] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0022] In the description of the present invention, it should be understood that descriptions involving orientation, such as orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0023] In the description of the present invention, "a plurality" means more than two. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0024] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0025] As described in the background technology, some easy-pull gasket structures usually include an easy-pull layer and an aluminum foil layer and a heat-sealing film layer connected thereto. Among them, the aluminum foil layer and the heat-sealing film layer play a sealing effect, and the easy-pull layer needs to be die-cut to produce a pull ear structure and a cutting line. Therefore, the easy-pull layer is generally made first, and then the easy-pull layer and the aluminum foil layer are compounded.

[0026] The cut-off line divides the easy-pull layer into an inner ring and an outer ring. When the pull tab is pulled, the inner ring separates from the outer ring, and the inner ring drives the aluminum foil layer and the heat-sealing film layer to be cut off along the cut-off line, completing the opening of the seal. However, in actual use, when the pull tab is pulled, the easy-pull layer is likely to be separated from the aluminum foil layer, so the inner ring of the easy-pull layer is detached, but the aluminum foil layer and the heat-sealing film layer remain intact, that is, the seal is not opened, but the easy-pull structure has failed.

[0027] Reference Figure 1 and Figure 2 As shown, an easy-pull sealing gasket according to an embodiment of the present invention is used to seal the opening of a container, and includes an easy-pull layer 100 , an aluminum foil layer 200 and a heat-sealing film layer 300 .

[0028] The easy-to-pull layer 100 is provided with a pull ear 101, and the easy-to-pull layer 100 is provided with a cutting line, which divides the easy-to-pull layer 100 into an outer ring and an inner ring, the pull ear 101 is connected to the inner ring, and the side of the pull ear 101 is connected to the cutting line, wherein the easy-to-pull layer 100 includes a printed base layer 110, a foaming layer 120 and a polymer film layer 130 which are arranged and compounded in sequence.

[0029] It should be understood that, although the easy-pull layer 100 has the printed base layer 110, the foaming layer 120 and the polymer film layer 130 which are arranged and compounded in sequence, when the easy-pull sealing gasket is produced, the layers are not compounded in sequence.

[0030] In the structure of the above-mentioned easy-pull layer 100, the pull ear 101 is a portion for pulling made by hollowing out the center of the easy-pull layer 100 by die-cutting. Similarly, the cut-off line can also be generated by die-cutting. Further, the cut-off line has a plurality of line segments that penetrate the easy-pull layer 100 and a plurality of line segments that remain connected. The plurality of line segments that penetrate the easy-pull layer 100 and the line segments that remain connected are alternately distributed to form the cut-off line, so that the inner ring of the easy-pull layer 100 is easily separated from the outer ring when the pull ear 101 is pulled, and when the pull ear 101 is not pulled, the inner ring and the outer ring can remain reliably connected.

[0031] In the easy-pull layer 100, the printed base layer 110 is used to print text or patterns. On the one hand, it can meet personalized customization needs, and on the other hand, it can form tracking lines and composite tracking lines to facilitate subsequent die-cutting positioning. The foaming layer 120 is used to improve the structural strength of the pull ear 101. When the pull ear 101 is pulled, the force is mainly borne by the printed base layer 110, the foaming layer 120 and the polymer film layer 130. However, the printed base layer 110 and the polymer film layer 130 are relatively thin and easy to break, so the foaming layer 120 can be thicker than the printed base layer 110 and the polymer film layer 130. It should be understood that the thickness of the easy-pull sealing gasket can be adjusted according to demand, and the overall thickness of the easy-pull sealing gasket can be changed by selecting foaming layers 120 of different thicknesses.

[0032] The aluminum foil layer 200 is compounded with the polymer film layer 130. It should be understood that the polymer film layer 130 is provided between the foaming layer 120 and the aluminum foil layer 200, which can improve the bonding strength between the foaming layer 120 and the aluminum foil layer 200, that is, improve the bonding strength between the easy-pull layer 100 and the aluminum foil layer 200. Specifically, when the easy-pull sealing gasket is set at the opening of the container by heat sealing, the polymer film layer 130 will also turn into a semi-molten state due to high temperature, and after cooling, the easy-pull layer 100 and the aluminum foil layer 200 are firmly adhered by the polymer film layer 130. Compared with the composite connection between the foaming layer 120 and the aluminum foil layer 200 by adhesive, the polymer film layer 130 can greatly improve the composite strength of the foaming layer 120 and the aluminum foil layer 200.

[0033] One side of the heat-sealing film layer 300 is compounded with the aluminum foil layer 200 , and the other side of the heat-sealing film layer 300 is used to fit the end surface of the opening of the container to complete the sealing.

[0034] It can be understood that the printing base layer 110 includes a first film layer 111 and a second film layer 112 , the first film layer 111 and the second film layer 112 are made of the same material, the first film layer 111 is used for printing patterns, the first film layer 111 and the second film layer 112 are composited, and the second film layer 112 is composited with the foaming layer 120 .

[0035] In some embodiments, since the thickness of the foaming layer 120 is greater than the thickness of the printing base layer 110, a large amount of glue is required when the printing base layer 110 is compounded with the foaming layer 120. The organic solvent in the glue will dilute the ink on the surface of the printing base layer 110, resulting in unclear printed text or patterns after the printing base layer 110 is compounded with the foaming layer 120. Therefore, it is preferred to form the printing base layer 110 by compounding the first film layer 111 and the second film layer 112, and the printing operation is printed on the surface of the first film layer 111 before the first film layer 111 and the second film layer 112 are compounded. Preferably, when the first film layer 111 and the second film layer 112 are compounded, the surface of the first film layer 111 on which the text or pattern is printed is compounded and connected with the second film layer 112, which has the effect of protecting the printed text or pattern.

[0036] It should be understood that since the thickness of the first film layer 111 and the second film layer 112 are relatively thin, the amount of glue applied can be reduced when the first film layer 111 and the second film layer 112 are compounded to reduce the effect of the solvent in the glue on the ink, which is conducive to high-definition printing.

[0037] During compounding, generally, the thinner material with adhesive is compounded with the thicker material, and the thickness of the polymer film layer 130 is thinner than the foam layer 120, so the polymer film layer 130 with adhesive is compounded with the foam layer 120. However, the polymer film layer 130 is relatively soft and has a certain degree of stretchability. In order to compound with the thick foam layer 120, the amount of adhesive is relatively large. Therefore, in some embodiments, after the polymer film layer 130 with adhesive is compounded with the foam layer 120, the semi-finished product will bend and have very low flatness, and will also cause severe wrinkles and tunnels in the semi-finished product, or even be scrapped.

[0038] It can be understood that, preferably, the easy-to-pull layer 100 further includes a third film layer 140 , and the third film layer 140 is disposed between the foaming layer 120 and the polymer film layer 130 .

[0039] The third film layer 140 is first compounded with the polymer film layer 130 to increase the thickness. At the same time, the thickness of the third film layer 140 is similar to that of the polymer film layer 130, and the amount of glue applied during compounding can be reduced. Therefore, after the third film layer 140 is compounded with the polymer film layer 130, the surface is smoother and less prone to wrinkles. After the third film layer 140 is compounded with the polymer film layer 130, the third film layer 140 is compounded with the foaming layer 120. The semi-finished product of the third film layer 140 and the polymer film layer 130 is less affected by the glue application, and is less prone to wrinkles when compounded with the foaming layer 120.

[0040] In some embodiments, the printing base layer 110 can use PET (polyethylene terephthalate) material. That is, the first film layer 111 and the second film layer 112 can both use PET material. The third film layer 140 can also use the same material as the printing base layer 110, that is, the third film layer 140 can also be PET material. The foaming layer 120 can use PE (polyethylene) foaming material. It should be understood that the heat-sealing film layer 300 can use PE, PP (polypropylene), PS (polystyrene) material, which is generally determined according to the material of the container to be sealed. Preferably, the heat-sealing film layer 300 is the same material as the container.

[0041] In some embodiments, the first film layer 111 may be made of PET material with a thickness of 0.012 mm, and the second film layer 112 may be made of PET material with a thickness of 0.025 mm. The polymer film layer 130 may be made of material with a thickness of 0.05 mm, and the third film layer 140 may be made of PET material with a thickness of 0.05 mm. Preferably, the thickness of the heat-sealing film layer 300 is less than or equal to 0.04 mm. When the heat-sealing film layer 300 is made of PET material, the thickness of the heat-sealing film layer 300 of PET material is preferably 0.015 mm. The thickness of the aluminum foil layer 200 is preferably 0.02 mm.

[0042] A method for manufacturing an easy-pull sealing gasket according to an embodiment of the present invention comprises manufacturing the easy-pull sealing gasket by the following steps: Step S1, compounding the printed printing base layer and the foaming layer to obtain a first semi-finished product, and curing the first semi-finished product; Step S2, compounding the third film layer with the polymer film layer to obtain a second semi-finished product, and ripening the second semi-finished product; Step S3, compounding the first semi-finished product with the second semi-finished product, combining the foaming layer with the third film layer during compounding to obtain a third semi-finished product, and ripening the third semi-finished product; Step S4, setting a plurality of pull ear areas on the surface of one side of the third semi-finished product having the polymer film layer, coating each pull ear area with a stripping varnish and curing it, and die-cutting the third semi-finished product to form pull ears and cutting lines to obtain an easy-to-pull layer; Step S5, compounding the aluminum foil layer and the heat-sealing film layer to obtain a fourth semi-finished product, and aging the fourth semi-finished product; Step S6, compounding the easy-pull layer with the fourth semi-finished product, combining the polymer film layer with the aluminum foil layer during compounding, aging after compounding, and die-cutting after aging to obtain a plurality of easy-pull sealing gaskets, each of which has a pull ear.

[0043] It should be understood that the first semi-finished product, the second semi-finished product, the third semi-finished product and the fourth semi-finished product are only named differently, and the first, second, third and fourth do not limit their production order. For example, step S1, step S2 and step S5 can all be performed at the same time, that is, the first semi-finished product, the second semi-finished product and the fourth semi-finished product are obtained at the same time for use.

[0044] After each layer is compounded, it needs to be cured. Generally, the curing time is 24 hours. A sufficiently long curing time can improve the bonding effect between the layers and remove residual solvents.

[0045] Since the foaming layer is thick, the third film layer needs to be compounded with the polymer film layer first to obtain the second semi-finished product, and then the second semi-finished product is compounded with the foaming layer in the first semi-finished product, that is, step S3. Furthermore, in step S3, the third film layer is combined with the foaming layer with adhesive, which can reduce the possibility of wrinkles during the compounding process and improve the flatness of the third semi-finished product.

[0046] It can be understood that in step S1, before the printed base layer and the foaming layer are compounded, a pattern is first printed on the surface of the first film layer, and then the first film layer and the second film layer are compounded. During the compounding, the side of the first film layer printed with the pattern is located between the first film layer and the second film layer. After the compounding, a fifth semi-finished product is obtained, and the fifth semi-finished product is matured.

[0047] When the first film layer and the second film layer are compounded, the thickness of the first film layer and the second film layer is similar. Compared with the first film layer directly compounded with the foaming layer, the amount of glue applied to the first film layer and the second film layer can be reduced to reduce the effect of the glue on the printing ink on the first film layer. After the first film layer and the second film layer are compounded, a clear printing pattern can still be obtained. In the subsequent steps, when the printing base layer and the foaming layer are compounded, even if the amount of glue applied is increased, the second film layer and the foaming layer will not affect the printing ink between the first film layer and the second film layer when compounded.

[0048] It is understandable that before the second film layer is composited with the first film layer, both side surfaces of the second film layer are subjected to corona treatment, and it is ensured that the dyne values ​​of both side surfaces of the second film layer are greater than or equal to 38.

[0049] Corona treatment of the surface of the second film layer can improve the composite strength, i.e., the bonding strength, between the first film layer and the second film layer. If the dyne value of the second film layer is low, it may lead to insufficient composite strength between the first film layer and the second film layer, which is easy to delaminate. Of course, when corona treatment is performed on the second film layer, the appropriate corona degree should be controlled. If the corona degree is too high, the second film layer is easy to be broken down during the corona process. It should be understood that the dyne value is a unit of force, which is used to express the magnitude of surface tension. The larger the dyne value, the greater the degree of corona treatment.

[0050] It can be understood that in step S2, before the third film layer is compounded with the polymer film layer, both side surfaces of the polymer film layer are subjected to corona treatment, and the dyne value of the surface on one side of the polymer film layer combined with the third film layer is greater than or equal to 48, and the dyne value of the other side surface of the polymer film layer is greater than or equal to 38.

[0051] The dyne value of the surface on one side where the polymer film layer is combined with the third film layer is greater than or equal to 48, which is conducive to improving the composite strength between the polymer film layer and the third film layer. Since the other side of the polymer film layer needs to be composited with the aluminum foil layer, its dyne value is preferably greater than or equal to 38.

[0052] Corona treatment is performed so that the surfaces of the second film layer and the polymer film layer have a dyne value that meets the requirements. The appropriate dyne value can carry sufficient glue during gluing to ensure the amount of glue applied.

[0053] It can be understood that in step S5, when the aluminum foil layer and the heat-sealing film layer are compounded, the aluminum foil layer with adhesive is compounded with the heat-sealing film layer.

[0054] It can be understood that in step S1, when the printed base layer is compounded with the foaming layer, the printed base layer with adhesive is compounded with the foaming layer.

[0055] The printed base layer is thinner than the foaming layer. The printed base layer is preferably laminated with the foaming layer with adhesive, which can ensure that the first semi-finished product has good flatness and reduce the possibility of wrinkles.

[0056] It can be understood that in step S3, when the first semi-finished product is compounded with the second semi-finished product, the third film layer adhesive is compounded with the foaming layer.

[0057] The first semi-finished product is a combination of a printed base layer and a foaming layer, and the second semi-finished product is a combination of a third film layer and a polymer film layer. The thickness of the first semi-finished product is greater than that of the second semi-finished product. Therefore, it is preferred that the third film layer on the second semi-finished product is composited with the foaming layer with adhesive to ensure that the third semi-finished product has good flatness and reduce the possibility of wrinkles.

[0058] In some embodiments, a first film layer of PET material with a thickness of 0.012 mm can be used, and one side of the surface thereof can be printed, and then the first film layer and a second film layer of PET material with a thickness of 0.025 mm can be compounded to obtain a fifth semi-finished product. During the compounding process, both sides of the second film layer are subjected to corona treatment so that the dyne value thereof is greater than or equal to 38. The dry compounding process is adopted during compounding, the anilox roller is 100-110 mesh, and the compounding is followed by aging, the aging temperature is controlled at 45-50° C., and the time is 24 hours.

[0059] When the third film layer is compounded with the polymer film layer, a third film layer of PET material with a thickness of 0.05mm and a polymer film layer with a thickness of 0.05mm are used. Both sides of the polymer film layer are corona-treated, and the surface of the polymer film layer used for compounding with the third film layer is weakly corona-treated, and the other side is strongly corona-treated. The dry compounding process is also used during compounding, and the anilox roller is 100-110 mesh. After compounding, the aging is carried out, and the aging temperature is controlled at 45-50°C for 24 hours.

[0060] When the heat sealing film layer and the aluminum foil layer are compounded, the thickness of the heat sealing film layer is selected to be less than or equal to 0.04 mm, the thickness of the aluminum foil layer is selected to be 0.02 mm, and the aluminum foil layer is compounded with glue and the heat sealing film layer. The anilox roller is 90 mesh. After compounding, it is aged, and the aging temperature is controlled at 45-50°C for 24 hours.

[0061] When the printed base layer is compounded with the foam layer, a PE material foam layer is selected. The thickness of the foam layer is adjusted according to the total thickness of the easy-pull sealing gasket, and is generally controlled between 0.6 and 1.8 mm. Preferably, both sides of the foam layer are also corona treated, and the dyne value is controlled to be greater than or equal to 38. Preferably, the density of the foam layer is controlled to be 0.45 g / cm 3 When the printing base layer and the foaming layer are compounded, the printing base layer is compounded with glue, the anilox roller is 70 mesh, and the compounding is cured, and the curing temperature is controlled at 40-45°C for 24 hours.

[0062] When the first semi-finished product is compounded with the second semi-finished product, the third film layer of the second semi-finished product is compounded with glue, the anilox roller has 70 mesh, and the compounding is cured. The curing temperature is controlled at 40-45°C for 24 hours.

[0063] When the stripping varnish is applied to the pull ear area, the coated area can be 1.5 mm larger than the shape of the pull ear. Preferably, a screen printing screen is used for coating and printing, and the mesh number of the screen printing screen is preferably greater than or equal to 300 meshes. After applying the stripping varnish, a UV (ultraviolet) lamp is used for curing. During curing, the temperature of the UV lamp can be set to be greater than or equal to 200°C.

[0064] When the easy-pull layer is compounded with the fourth semi-finished product, the aluminum foil layer in the fourth semi-finished product is compounded with the polymer film layer in the easy-pull layer, the anilox roller is 60 mesh, the ratio of the glue and the solvent for compounding is adjusted to 1:1, and 1 / 4 of the curing agent is added. After compounding, the aging temperature is controlled at 60±3℃, and the aging time is 48 hours.

[0065] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. An easy-pull sealing gasket for sealing the opening of a container, characterized in that: include: An easy-to-pull layer (100), the easy-to-pull layer (100) being provided with a pull ear (101), the easy-to-pull layer (100) being provided with a cutting line, the cutting line dividing the easy-to-pull layer (100) into an outer ring and an inner ring, the pull ear (101) being connected to the inner ring, and the side of the pull ear (101) being connected to the cutting line, wherein the easy-to-pull layer (100) comprises a printed base layer (110), a foaming layer (120), and a polymer film layer (130) which are sequentially arranged and composited; An aluminum foil layer (200), the aluminum foil layer (200) being composited with the polymer film layer (130); A heat-sealing film layer (300), one side of the heat-sealing film layer (300) being composited with the aluminum foil layer (200), and the other side of the heat-sealing film layer (300) being used to fit the end surface of the opening of the container to complete sealing.

2. The easy-pull sealing gasket according to claim 1, characterized in that: The printing base layer (110) comprises a first film layer (111) and a second film layer (112); the first film layer (111) and the second film layer (112) are made of the same material; the first film layer (111) is used for printing patterns; the first film layer (111) and the second film layer (112) are composited; and the second film layer (112) and the foaming layer (120) are composited.

3. The easy-pull sealing gasket according to claim 1 or 2, characterized in that: The easy-to-pull layer (100) further comprises a third film layer (140), wherein the third film layer (140) is arranged between the foaming layer (120) and the polymer film layer (130).

4. A method for making an easy-pull sealing gasket, characterized in that: The easy-pull sealing gasket according to claim 3 is manufactured by the following steps; Step S1, compounding the printed base layer and the foaming layer to obtain a first semi-finished product, and ripening the first semi-finished product; Step S2, compounding the third film layer and the polymer film layer to obtain a second semi-finished product, and ripening the second semi-finished product; Step S3, compounding the first semi-finished product with the second semi-finished product, combining the foaming layer with the third film layer during compounding to obtain a third semi-finished product, and ripening the third semi-finished product; Step S4, setting a plurality of pull ear regions on the surface of one side of the third semi-finished product having the polymer film layer, coating each pull ear region with a stripping varnish and curing it, and die-cutting the third semi-finished product to form pull ears and cutting lines to obtain an easy-to-pull layer; Step S5, compounding the aluminum foil layer and the heat-sealing film layer to obtain a fourth semi-finished product, and aging the fourth semi-finished product; Step S6, compounding the easy-pull layer with the fourth semi-finished product, combining the polymer film layer with the aluminum foil layer during compounding, aging after compounding, and die-cutting after aging to obtain a plurality of easy-pull sealing gaskets, and each easy-pull sealing gasket has the pull ear.

5. The method for making the easy-pull sealing gasket according to claim 4, characterized in that: In step S1, before the printed base layer is compounded with the foaming layer, a pattern is first printed on the surface of the first film layer, and then the first film layer is compounded with the second film layer. During the compounding, the side of the first film layer printed with the pattern is located between the first film layer and the second film layer. After the compounding, a fifth semi-finished product is obtained, and the fifth semi-finished product is matured.

6. The method for making the easy-pull sealing gasket according to claim 5, characterized in that: Before the second film layer is compounded with the first film layer, both side surfaces of the second film layer are subjected to corona treatment, and it is ensured that the dyne values ​​of both side surfaces of the second film layer are greater than or equal to 38.

7. The method for making an easy-pull sealing gasket according to claim 4, characterized in that: In step S2, before the third film layer is compounded with the polymer film layer, both side surfaces of the polymer film layer are subjected to corona treatment, and the dyne value of the surface on one side of the polymer film layer combined with the third film layer is greater than or equal to 48, and the dyne value of the other side surface of the polymer film layer is greater than or equal to 38.

8. The method for making an easy-pull sealing gasket according to claim 4, characterized in that: In step S5, when the aluminum foil layer and the heat-sealing film layer are compounded, the aluminum foil layer is compounded with adhesive and the heat-sealing film layer.

9. The method for manufacturing the easy-pull sealing gasket according to claim 4, characterized in that: In step S1, when the printed base layer is compounded with the foaming layer, the printed base layer is compounded with the foaming layer with adhesive.

10. The method for manufacturing the easy-pull sealing gasket according to claim 4, characterized in that: In step S3, when the first semi-finished product and the second semi-finished product are compounded, the third film layer adhesive is compounded with the foaming layer.

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