Flat-bottom packaging hose and manufacturing method thereof

Abstract

The invention provides a flat-bottom packaging hose and a manufacturing method thereof.The flat-bottom packaging hose comprises a laminated pipe body, a discharging component and a base integrally connected to the bottom of the laminated pipe body, the base provides vertical support for the laminated pipe body, the base comprises a base piece and a bottom piece, the base piece is provided with a first main body and a first connecting part formed on the outer edge of the first main body, and the bottom piece is provided with a second main body; a positioning part is convexly arranged on the first main body towards one side of the laminated tube body, the first connecting part forms an embedding and buckling structure, the bottom sheet is provided with a second main body and a second connecting part formed on the outer edge of the second main body, the second main body is in fit connection with the first main body, and the second connecting part is embedded in the embedding and buckling structure; the first connecting part and the second connecting part are connected to the inner circumferential face of the bottom of the laminated pipe body in an attached mode. According to the packaging hose, on the basis that the laminated hose body has many advantages, the base capable of being vertically supported is integrally arranged at the bottom of the laminated hose body through the improved manufacturing process, so that the overall sealing performance, strength and appearance smoothness of the packaging hose are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of packaging containers, in particular to a flat-bottom packaging soft tube and a manufacturing method thereof. BACKGROUND

[0002] Plastic bottles and laminated tubes are two common packaging containers.

[0003] Plastic bottles are widely used in the packaging of liquid or solid products in the fields of daily chemicals, pharmaceuticals, etc., and are generally made by blow molding processing, which is a mature technology with low cost. The bottom of the plastic bottle is usually designed as a flat bottom to facilitate placement. However, the material of the ordinary plastic bottle is relatively brittle, has poor elastic deformation ability, and has weak barrier properties to the external environment (including oxygen, light, and humidity), which greatly affects the stability of the packaging material itself and the contents. In addition, the decoration of the plastic bottle is generally a printed packaging sticker directly attached to the bottle body, which has a single appearance and is prone to peeling.

[0004] Laminated tubes for storing oral care products, cosmetics, or pharmaceuticals are usually manufactured through various processing technologies, including film and / or laminated manufacturing processes, such as blow molding / casting film processes, laminated composite processes, tube making processes, etc. The blow molding film is laminated (optionally laminated with other films or paper or foil) to produce a laminated sheet with the required properties and thickness. In the laminated composite process, the appearance pattern, touch, etc. of the laminated sheet can be decorated with diversity. In the tube making process, the laminated sheet of appropriate size is wound and welded into a tubular shape, and then processed through shoulder injection, tail sealing, etc.

[0005] Laminated tubes have many advantages over plastic bottles, such as: good deformation ability to control the extrusion amount of the contents by extrusion deformation; good barrier properties to improve the storage stability of the contents; the decoration layer is integrated with the tube body and is not prone to peeling. However, due to the limitations of current processing technology, existing laminated tubes generally use thermal or ultrasonic welding to seal the tail, forming a flat strip structure, which prevents the laminated tube from being placed vertically through the tail end.

[0006] It should be noted that the above introduction to the background art is only to facilitate a clear and complete description of the technical solutions of the present application, and to facilitate the understanding of those skilled in the art. The above technical solutions cannot be considered as known to those skilled in the art merely because they are described in the background art section of the present application. SUMMARY

[0007] The present application aims to provide a flat-bottom packaging soft tube with high barrier properties and a stable vertically placed bottom.

[0008] To achieve the above-mentioned purpose, the present application provides a flat-bottom packaging soft tube, comprising: The laminated pipe body is formed by a laminated sheet, has a ring-shaped top and bottom, a first opening and an inner circumferential surface of the bottom formed in the bottom, and a discharging member with a discharging port integrally connected to the top; The base is integrally connected to the inner circumferential surface of the bottom, used for closing the first opening and providing upright support for the laminated pipe body, and includes a base sheet and a bottom sheet, wherein, The base sheet has a first main body and a first connecting portion formed at the outer edge of the first main body, the first connecting portion is formed with a snap structure and a first outer circumferential surface, the first outer circumferential surface is connected to the inner circumferential surface of the bottom, and the first main body is provided with a positioning portion on the side of the laminated pipe body; The bottom sheet has a second main body and a second connecting portion formed at the outer edge of the second main body, the second main body is connected to the first main body, the second connecting portion is embedded in the snap structure, and the second connecting portion is formed with a second outer circumferential surface, which is at least partially connected to the inner circumferential surface of the bottom.

[0009] As a further improvement of the present application, the diameter of the discharging port is smaller than that of the first opening, and the positioning area formed by the positioning portion is within the projection range of the discharging port on the first main body in the axial direction.

[0010] As a further improvement of the present application, the positioning portion is ring-shaped, and the positioning area is an inner area formed by the positioning portion.

[0011] As a further improvement of the present application, the longitudinal section of the first connecting portion includes at least one ring-shaped step unit, the height of the step unit with a larger diameter relative to the bottom end is higher than that of the step unit with a smaller diameter relative to the bottom end, and the snap structure is formed by the side surface and the bottom surface of the step unit.

[0012] As a further improvement of the present application, the bottom is further formed with a bottom outer circumferential surface, the bottom of the laminated pipe body is inwardly bent to form a bending portion covering the second connecting portion, the second connecting portion is formed with a third outer circumferential surface located at the outer circumferential surface of the lower edge of the second outer circumferential surface, and the bottom outer circumferential surface and the third outer circumferential surface smoothly connect and transition.

[0013] As a further improvement of the present application, the laminated sheet includes at least an inner layer, a barrier layer and an outer layer arranged from inside to outside, the raw material of the inner layer includes polyolefin, and the raw material of the discharging member and the base includes polyolefin.

[0014] As a further improvement of the present application, the laminated sheet is printable and flexible, the material of the discharging member is rigid, and the material of the base sheet and / or the bottom sheet is rigid.

[0015] As a further improvement of the present application, the discharge component, the base sheet or the bottom sheet is embedded with a barrier layer along the respective extension direction.

[0016] To achieve the above object, the present application provides a method for manufacturing the flat-bottom packaging soft tube, comprising the following steps: S1, preparing the laminated tube body; S2, integrally forming the discharge component on the top of the laminated tube body; S3, preparing the base sheet; S4, assembling the base sheet to the laminated tube body: inserting the mold core from the discharge port to the bottom, positioning the positioning part of the base sheet at the end of the mold core, and positioning the first outer peripheral surface of the first connecting part to the inner peripheral surface of the bottom of the laminated tube body; S5, integrally forming the bottom sheet on the bottom of the laminated tube body; S6, demolding to obtain the packaging soft tube.

[0017] As a further improvement of the present application, in step S5, the bottom sheet is injection molded based on the outer bottom surface of the base sheet and the inner peripheral surface of the bottom of the laminated tube body; or the bottom sheet is pre-prepared and then welded to the outer bottom surface of the base sheet and the inner peripheral surface of the bottom of the laminated tube body.

[0018] Compared with the prior art, the present application has the following advantages: The flat-bottom packaging soft tube provided by the present application has the advantages of good deformation ability, strong barrier performance, rich decorative performance and the like of the laminated tube body, and is provided with a base for upright support, the base is provided with a base sheet to assist the processing and forming of the bottom sheet, and the connection stability of the bottom sheet and the bottom of the laminated tube body is improved through the base sheet; the bonding surface between the laminated tube body and the base sheet and the bottom sheet has good material compatibility, so that the base sheet and the bottom sheet can be effectively combined with the laminated tube body by fusion welding, realizing a sealing integrated design and improving the sealing performance, overall strength and shape smoothness of the packaging soft tube. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 A cross-sectional view of a flat-bottom packaging soft tube provided by the present application; Figure 2 A method for manufacturing a flat-bottom packaging soft tube as Figure 1 schematically shown in the present application; Figure 3 A cross-sectional view of a laminated sheet provided by the present application; Figure 4 An exploded view of Figure 1 ; Figure 5Fig. 1 is a schematic view of a processing method for integrally forming a dispensing member with a laminated tube body; Figure 6 Fig. 2 is a schematic view of a processing method for integrally forming a base with a laminated tube body; Figure 7 Fig. 3 is a schematic view of a processing method for integrally forming a base with a laminated tube body; Figure 1 Fig. 4 is an enlarged view of the base and the bottom connecting portion in Fig. 3. DETAILED DESCRIPTION

[0020] The present application will be described in detail below with reference to the embodiments shown in the drawings, but it should be noted that these embodiments are not limiting of the present application, and equivalent transformations or substitutions of function, method, or structure made by those of ordinary skill in the art based on these embodiments are within the scope of the present application.

[0021] Referring to Fig. 1, the present application discloses a flat-bottomed packaging tube 100, which includes a laminated tube body 10, a dispensing member 20 formed on the top of the laminated tube body 10, and a base 110 formed on the bottom 11 of the laminated tube body 10. The laminated tube body 10 is formed by welding after being enclosed by laminated sheets, and the base 110 is used to close the bottom 11 of the laminated tube body 10 and provide upright support for the packaging tube 100. The packaging tube 100 can stand by itself and provide more storage space like a bottle, while bringing many advantages of laminated tubes, such as easy combination of different materials, squeezability, high barrier property, and various surface decoration. Figure 1 Referring to Fig. 2, the present application simultaneously provides a method for manufacturing the flat-bottomed packaging tube 100, which specifically includes the following steps:

[0022] Step S1, preparing a laminated tube body 10. Figure 2 Taking the structure of a basic laminated sheet 101 as an example, it includes an inner layer 102, an outer layer 106, and a barrier layer 104 arranged between the inner layer 102 and the outer layer 106. The inner layer 102 is preferably a film made of polyolefin as the main raw material, which has good heat sealing performance. The outer layer 106 can be a film made of polyolefin as the main raw material according to actual application needs, as a protective outer sealing layer, or can also be a material with a specific touch or texture for decoration, as a material basis for product appearance creativity, to improve the competitiveness of product design.

[0023] Figure 3

[0024] ​​The barrier layer 104 is classified according to the material and mainly includes a polymer film (also referred to as a full plastic film) and an aluminum film. The polymer film has good barrier effect on water vapor and oxygen, and can be a co-extruded film of polyolefin and ethylene-vinyl alcohol copolymer (EVOH), a co-extruded film of polyolefin and polyvinyl chloride (PVC), a co-extruded film of polyolefin and nylon (PA), a co-extruded film of polyolefin and polyamide (ONY), a co-extruded film of polyolefin, ethylene-vinyl alcohol copolymer (EVOH) and polyamide, or a polyolefin coated film coated with polyvinyl alcohol (PVA) or polyvinylidene chloride (PVDC) as a barrier coating layer. When the barrier layer 104 is a polymer film, the barrier layer 104 can also be directly used as the inner layer 102, or the polyolefin side of the barrier layer 104 can be used as the inner layer 102.

[0025] The aluminum film includes an aluminum foil, an aluminum plastic film, an aluminum plated film, an aluminum oxide film or other films with aluminum as the core material, has high mechanical strength, high barrier properties to water vapor and oxygen, and can also effectively block ultraviolet rays.

[0026] For the polyolefin involved in the manufacture of the laminated sheet, in an embodiment, polyethylene (PE) can be used for manufacture, and the polyethylene (PE) can be further subdivided into low-density polyethylene (LDPE), medium-density polyethylene (MDPE), high-density polyethylene (HDPE), linear low-density polyethylene (LLDPE), etc., and can be used singly or in combination according to actual needs.

[0027] It should be noted that, Figure 3 It should be noted that,

[0028] The laminated sheet 101 can also include other functional layers between adjacent film layers. For example, a printing layer can be provided between the barrier layer 104 and the outer layer 106, and the printing layer itself is also a composite layer obtained by printing multiple film layers one on another. Therefore, the number and thickness of the specific film layers of the laminated sheet 101 are not limited in the present application. Figure 4As shown, the slit laminated sheet 101 is prepared into a laminated tube body 10 by a tube making machine, so that the laminated tube body 10 has a ring-shaped bottom 11, a first opening 13 formed on the bottom 11, a ring-shaped top 12, and a second opening 14 formed on the top 12. The laminated tube body 10 in a conventional form is in a straight tube shape, i.e., the first opening 13 and the second opening 14 have the same diameter, and the laminated tube body 10 is flexible and can be deformed by extrusion.

[0029] In step S2, a discharge member 20 is integrally formed on the top 12 of the laminated tube body 10.

[0030] Figure 4 Taking the basic structure of the discharge member 20 as an example, the discharge member 20 includes a tube shoulder 21, a tube head 22, and a discharge port 23 formed on the tube head 22. In other embodiments, the configuration of the discharge member 20 can be deformed according to actual application requirements.

[0031] The basic raw material of the discharge member 20 is polyolefin. For the processing and molding of the discharge member 20, the following two processing techniques are mainly included: the discharge member 20 is pre-molded by an injection molding process, and then integrally formed on the top 12 of the laminated tube body 10 by a welding process; or the discharge member 20 is directly integrally formed on the top 12 of the laminated tube body 10 by an injection molding process. The discharge member 20 in a conventional material is rigid, i.e., has the characteristic of resisting elastic deformation.

[0032] In another embodiment, a barrier layer (not shown) is arranged on the discharge member 20 to improve the barrier property of the discharge member 20, for example, the barrier layer is embedded along the extension direction of the discharge member 20.

[0033] Referring to Figure 5 As shown, when the discharge member 20 is injection molded or welded on the top 12 of the laminated tube body 10, a first mold core 51 is needed to extend from the first opening 13 of the bottom 11, and the extension end of the first mold core 51 extends to the end face at the second opening 14 or the end face at the discharge port 23, and then the first mold core 51 is combined with an outer mold (not shown) for injection molding. After demolding, the bottom inner circumferential surface of the tube shoulder 21 is smoothly connected with the top inner circumferential surface of the laminated tube body 10, and the bottom outer circumferential surface of the tube shoulder 21 is smoothly connected with the top outer circumferential surface of the laminated tube body 10. Since the material of the discharge member 20 and the material of the laminated tube body 10 both contain polyolefin, the discharge member 20 and the laminated tube body 10 have high welding compatibility, so that the discharge member 20 and the laminated tube body 10 have high connection strength and good sealing property.

[0034] In combination Figure 1 and Figure 4As shown, the discharge member 20 is integrally formed at the top 12 of the laminated tube body 10 to jointly define a receiving cavity 15 with the laminated tube body 10 for receiving the material, wherein the second opening 14 is closed and the material is discharged from the discharge port 23. Since the laminated tube body 10 is flexible, the material is pushed out of the discharge port 23 by extruding the laminated tube body 10.

[0035] Step S3, preparation of the base sheet 30.

[0036] Referring to Fig. 2, the base sheet 30 is integrally formed at the bottom 11 of the laminated tube body 10 to jointly define a receiving cavity 15 with the laminated tube body 10 for receiving the material, wherein the second opening 14 is closed and the material is discharged from the discharge port 23. Since the laminated tube body 10 is flexible, the material is pushed out of the discharge port 23 by extruding the laminated tube body 10. Figure 6 As shown, since the top 12 of the laminated tube body 10 is integrally connected with the discharge member 20, the second mold core 52 can only extend into the receiving cavity 15 from the discharge port 23 to jointly mold with the outer mold (not shown). Since the diameter of the discharge port 23 is smaller than the diameter of the second opening 14, i.e. smaller than the diameter of the first opening 13, it is impossible to form an inner mold with the same diameter as the second opening 14 at the bottom 11 of the laminated tube body 10 by using a mold core with the same diameter as the first mold core 51. To solve this problem, the applicant proposes to configure a forming base, i.e. the base sheet 30, at the bottom 11 as a forming inner mold of the bottom sheet 40. A positioning portion 33 is provided at the inner bottom surface of the base sheet 30 for positioning the second mold core 52.

[0037] In an embodiment, the base sheet 30 provided by the present application has a first body 31, a first connecting portion 32 formed at the outer edge of the first body 31, and a positioning portion 33 formed at the first body 31. The first body 31 is in the shape of a sheet and has a first outer bottom surface 311 and a first inner bottom surface 312. The first connecting portion 32 is bent from the first body 31 to the side where the first inner bottom surface 312 is located and has a snap structure 321 formed at the side where the first outer bottom surface 311 is located for snapping the bottom sheet 40, and a first outer peripheral surface 322 for being attached to the inner peripheral surface 111 of the bottom of the laminated tube body 10.

[0038] In an embodiment, the longitudinal section of the first connecting portion 32 includes at least one annular step unit, and the height of the step unit with a larger diameter relative to the bottom end of the bottom 11 is higher than the height of the step unit with a smaller diameter relative to the bottom end of the bottom 11, and the snap structure 321 is defined by the bottom surface and the side surface of the step unit. For example, in combination with Fig. 3, the snap structure 321 is formed by the bottom surface and the side surface of the step unit. Figure 7As shown, the two-stage stepped unit is set as an example, including a first-stage stepped unit 323 and a second-stage stepped unit 324, the first-stage stepped unit 323 is formed by bending the outer edge of the first main body 31 upward, the second-stage stepped unit 324 is formed by bending the outer edge of the first-stage stepped unit 323 upward, the outer peripheral surface of the first-stage stepped unit 323 and the bottom surface of the second-stage stepped unit 324 constitute a ring-shaped snap structure 321, and the outer peripheral surface of the second-stage stepped unit 324 is a first outer peripheral surface 322, which is used to be connected to the bottom inner peripheral surface 111 of the layered pipe body 10.

[0039] The positioning portion 33 is formed by protruding the central area of the first inner bottom surface 312 upward, and when the base sheet 30 is positioned on the bottom 11 of the packaging hose 100, the positioning portion 33 protrudes toward the discharge port 23.

[0040] In an embodiment, the base sheet 30 can use polyolefin as the basic raw material, and is processed by injection molding, and further, a barrier layer (not shown) can also be embedded along the extension direction of the first main body 31 of the base sheet 30 to improve the barrier property of the base 110. In another embodiment, the base sheet 30 can also be processed by using a laminated sheet material with good barrier property.

[0041] Step S4, assembling the base sheet 30 to the laminated pipe body 10.

[0042] Referring to Figure 6 As shown, before assembling the base sheet 30, the second mold core 52 is extended from the discharge port 23 to the inside of the accommodation cavity 15 to a position close to the first opening 13, and then the positioning portion 33 of the base sheet 30 is positioned on the extension end 521 of the second mold core 52, and the first outer peripheral surface 322 of the base sheet 30 is attached to the bottom inner peripheral surface 111 of the layered pipe body 10. Since the extension end 521 of the second mold core 52 must be smaller than the caliber of the discharge port 23, the positioning area formed by the positioning portion 33 must be located within the projection range of the first main body 31 projected by the discharge port 23 in the axial direction. In an embodiment, the positioning portion 33 is annular, and the positioning area is the inner area formed by the positioning portion 33. The base sheet 30 is placed on the bottom 11 by the first opening 13, and the positioning portion 33 is sleeved on the extension end 521 of the second mold core 52. For example, in another embodiment, the positioning portion 33 is a positioning protrusion (not shown) arranged at the center of the first main body 31. In this application, the structure of the positioning portion 33 is not limited, and in other alternative embodiments, the positioning portion 33 can also have other configurations, as long as it can cooperate with the extension end 521 of the second mold core 52 to position the base sheet 30.

[0043] For the assembly of the substrate 30, it is preferred to invert the discharging component 20, with the first opening 13 of the laminated tube body 10 facing upward. The second die core 52 is inserted upward into the discharging port 23 and extends upward. Under the balanced gravity, the substrate 30 can be more balancedly positioned at the bottom 11.

[0044] Step S5: The bottom 11 of the laminated tube body 10 forms the bottom sheet 40.

[0045] This application provides a base 110, which consists of the substrate 30 and the bottom sheet 40.

[0046] Refer Figure 6 As shown, after the substrate 30 is assembled on the laminated tube body 10, with the first outer bottom surface 311 of the substrate 30, the outer bottom surface of the snap-in structure 321, and the inner peripheral surface 111 of the bottom of the laminated tube body 10 as the base surfaces, the bottom sheet 40 is injection-molded, or the bottom sheet 40 is prefabricated first, and then the bottom sheet 40 is integrally welded to the bottom 11 by welding methods such as ultrasonic welding.

[0047] Refer Figure 1 and Figure 6 As shown, the bottom sheet 40 has a second main body 41 and a second connecting portion 42 formed on the outer edge of the second main body 41. The second main body 41 is in a sheet shape, and the second inner bottom surface 411 of the second main body 41 is adhesively connected to the first outer bottom surface 311 of the first main body 31. The second connecting portion 42 is bent from the second main body 41 toward the side where the second inner bottom surface 411 is located and is embedded in the snap-in structure 321 of the substrate 30. At the same time, a second outer peripheral surface 421 is formed and is adhesively connected to the inner peripheral surface 111 of the bottom of the laminated tube body 10.

[0048] Refer Figure 7 As shown, the first connecting portion 32 is designed as a multi-level stepped shape to extend axially in a limited radial area, so as to obtain a larger adhesive connection area for the snap-in structure 321, that is, for the second connecting portion 42 embedded in the snap-in structure 321, it has a larger adhesive connection area with the side surface and the bottom surface of the multi-level stepped unit (for example, taking two-level stepped units as an illustration, the adhesive connection surface includes the outer peripheral surface of the first-level stepped unit 323 and the bottom surface of the second-level stepped unit 324), increasing the connection strength between the outer edges of the bottom sheet 40 and the substrate 30, making the support of the base more stable.

[0049] At the same time, the first connecting portion 32 has a larger area of the first outer peripheral surface 322 for adhesive connection with the inner peripheral surface of the bottom surface 111, and the second connecting portion 42 has a larger area of the second outer peripheral surface 421 for adhesive connection with the inner peripheral surface of the bottom surface 111, so that there is a stronger sealing performance between the base 110 and the bottom 11 of the laminated tube body 10.

[0050] Further, in the process of forming the bottom sheet 40 on the bottom 11 of the laminated tube 10 by injection molding or welding, the bottom 11 of the laminated tube 10 is inwardly bent to form a bent portion 113 covering the second connecting portion 42, the second connecting portion 42 is formed with a third outer circumferential surface 422 located outside the lower edge of the second outer circumferential surface 421, and the bottom outer circumferential surface 112 and the third outer circumferential surface 422 are smoothly connected and transitioned to form an integrated visual effect and reduce stress concentration.

[0051] In addition, since the materials of the base sheet 30 and the bottom sheet 40 and the laminated tube 10 all contain polyolefin, the bottom 110 and the laminated tube 10 have high welding compatibility, so that the bottom 110 and the laminated tube 10 have high connection strength and good sealing performance. By covering the second connecting portion 42 with the bent portion 113, the connection strength and sealing performance between the bottom sheet 40 and the laminated tube 10 can be further enhanced.

[0052] Peeling strength test Take the flat-bottom packaging tube 100 provided by the present application, uniformly cut the discharge member 20 and the laminated tube 10 into several 1-2 cm wide strips along the axial direction, and stretch the strips at 180° to the bottom 110 with a force of 10 kg. No breakage occurs at the welding position of the laminated tube 10 and the bottom 110.

[0053] Sealing performance test The positive pressure detection method is used to generate pressure difference by inflating, and the gas overflow is observed. Under a pressure of 0.5 bar, the gas is blown for 10 s, no bubble overflow phenomenon occurs, and the welding position of the laminated tube 10 and the bottom 110 is not damaged.

[0054] In an embodiment, the second outer bottom surface 412 of the bottom sheet 40 is further formed with a support portion 413 for supporting, for example, the support portion 413 is formed at the outer edge of the second outer bottom surface 412.

[0055] In an embodiment, the bottom sheet 40 can use polyolefin as the basic raw material and be processed and formed by injection molding. Further, a barrier layer (not shown) can also be embedded along the extension direction of the second main body 41 of the bottom sheet 40 to improve the barrier property of the bottom sheet 40. In another embodiment, the bottom sheet 40 can also be processed and formed by using a laminated sheet material with good barrier property.

[0056] At least one of the base sheet 30 and the bottom sheet 40 is rigid to make the bottom 110 have good supportability.

[0057] The flat-bottom packaging tube 100 made by the above processing process can be vertically placed, the container is integrally formed, the appearance is smooth, the laminated tube 10 has good deformation ability, and the bottom has good load-bearing capacity.

[0058] The flat bottom packaging hose 100 provided by the present application, the laminated pipe body 10, the discharging component 20 and the base 110 can be made of environment-friendly and recyclable materials according to actual needs, so as to realize full plasticization of the packaging hose 100 and meet the requirements of recycling and recycling of the packaging hose 100.

[0059] The application mode of the flat bottom packaging hose 100 is not limited, for example, the discharging component 20 can be directly connected and closed by a conventional cap (not shown). Alternatively, a dosing discharging component or other functional components such as a one-way valve can be additionally provided, and then a cap is provided.

[0060] The above series of detailed descriptions are only specific descriptions of the feasible embodiments of the present application, and are not used to limit the protection scope of the present application. Any equivalent embodiments or changes made without departing from the spirit of the present application should be included in the protection scope of the present application.

[0061] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be realized in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0062] In addition, it should be understood that although the present specification is described in terms of embodiments, each embodiment does not contain only one independent technical solution, and the description manner of the specification is only for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A flat bottomed packaging tube characterised in that, The package flexible tube comprises: a laminated tube body formed by a laminated sheet, having a ring-shaped top and bottom, a first opening formed in the bottom and an inner circumferential surface of the bottom, and a discharging member with a discharging port integrally connected to the top; a base integrally connected to the inner circumferential surface of the bottom, used for closing the first opening and providing upright support for the laminated tube body, the base comprising a base sheet and a bottom sheet, wherein the base sheet has a first main body and a first connecting portion formed at the outer edge of the first main body, the first connecting portion is formed with a snap structure and a first outer circumferential surface, the first outer circumferential surface is attached to the inner circumferential surface of the bottom, and the first main body is provided with a positioning portion protruding towards the side where the laminated tube body is located; the bottom sheet has a second main body and a second connecting portion formed at the outer edge of the second main body, the second main body is attached to the first main body, the second connecting portion is embedded in the snap structure, and the second connecting portion is formed with a second outer circumferential surface, which is attached to the inner circumferential surface of the bottom.

2. The flat bottomed packaging tube of claim 1, wherein, The diameter of the discharging port is smaller than that of the first opening, and the positioning area formed by the positioning portion is within the projection range of the discharging port on the first main body in the axial direction.

3. The flat bottomed packaging tube of claim 2, wherein, The positioning portion is ring-shaped, and the positioning area is an inner area formed by the positioning portion.

4. The flat bottomed packaging tube of claim 1, wherein, The longitudinal section of the first connecting portion comprises at least one ring-shaped step unit, the height of the step unit with a larger diameter relative to the bottom end is higher than that of the step unit with a smaller diameter relative to the bottom end, and the snap structure is formed by the side surface and the bottom surface of the step unit.

5. The flat bottomed packaging tube of claim 1, wherein, The bottom is also formed with a bottom outer circumferential surface, the bottom of the laminated tube body is bent inward to form a bending portion covering the second connecting portion, the second connecting portion is formed with a third outer circumferential surface located at the outer circumferential surface of the lower edge of the second outer circumferential surface, and the bottom outer circumferential surface and the third outer circumferential surface smoothly connect and transition.

6. The flat bottomed packaging tube of claim 1, wherein, The laminated sheet comprises at least an inner layer, a barrier layer and an outer layer arranged from inside to outside, the raw material of the inner layer comprises polyolefin, and the raw material of the discharging member and the base comprises polyolefin.

7. The flat bottomed packaging tube of claim 1, wherein, The laminated sheet is printable and flexible, the material of the discharging member is rigid, and the material of the base sheet and / or the bottom sheet is rigid.

8. The flat bottomed packaging tube of claim 1, wherein, The discharging member, the base sheet or the bottom sheet is embedded with a barrier layer in the respective extension direction.

9. A method of manufacturing a flat bottomed packaging tube according to any one of claims 1-8, characterized in that, The package flexible tube comprises the following steps: S1, preparing the laminated tube body; S2, integrally forming the discharging member on the top of the laminated tube body; S3, preparing the base sheet; S4, assembling the base sheet on the laminated tube body: inserting a mold core from the discharging port to the bottom, positioning the positioning portion of the base sheet at the end of the mold core, and attaching the first outer circumferential surface of the first connecting portion to the inner circumferential surface of the bottom of the laminated tube body; S5, integrally forming the bottom sheet on the bottom of the laminated tube body; S6, demolding to obtain the package flexible tube.

10. The method of manufacturing a flat bottomed packaging tube according to claim 9, characterized in that, In step S5, the bottom sheet is formed by injection molding based on the outer bottom surface of the base sheet and the inner bottom peripheral surface of the bottom portion of the laminated pipe body, or the bottom sheet is prepared in advance and then welded to the outer bottom surface of the base sheet and the inner bottom peripheral surface of the bottom portion of the laminated pipe body.

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