Flat bottomed packaging tube and method of manufacturing the same

Abstract

The application provides a flat-bottom packaging hose and a manufacturing method thereof, which comprises a laminated pipe body, a discharging component and a base integrally connected to the bottom of the laminated pipe body, the base provides upright support for the laminated pipe body, and the base comprises a base sheet and a bottom sheet, wherein the base sheet has a first main body and a first connecting portion formed on the outer edge of the first main body, the first main body is provided with a positioning portion towards the side where the laminated pipe body is located, and the first connecting portion forms a snap structure; the bottom sheet has a second main body and a second connecting portion formed on the outer edge of the second main body, the second main body is connected to the first main body in a fit manner, the second connecting portion is embedded in the snap structure, and the first connecting portion and the second connecting portion are both connected to the inner circumferential surface of the bottom of the laminated pipe body in a fit manner. On the basis of the advantages of the laminated pipe body, the base capable of providing upright support is integrally arranged at the bottom of the laminated pipe body through an improved manufacturing process, so that the overall sealing property, strength and shape 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. They 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 ordinary plastic bottles 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 plastic bottles is usually directly applied by printing a packaging sticker on 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:

[0009] 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;

[0010] 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,

[0011] 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;

[0012] 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.

[0013] 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 projected on the first main body in the axial direction.

[0014] 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.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] As a further improvement of the present application, the laminated sheet is printable and flexible, the material of the discharge component is rigid, and the material of the base sheet and / or the bottom sheet is rigid.

[0019] 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.

[0020] To achieve the above-mentioned object, the present application simultaneously provides a method for manufacturing the flat-bottom packaging soft tube, comprising the following steps:

[0021] S1, preparing the laminated tube body;

[0022] S2, integrally forming the discharge component on the top of the laminated tube body;

[0023] S3, preparing the base sheet;

[0024] S4, assembling the base sheet to the laminated tube body: inserting the mold core from the discharge port to the bottom, positioning the positioning portion of the base sheet at the end of the mold core, and positioning the first outer peripheral surface of the first connecting portion to the inner peripheral surface of the bottom of the laminated tube body;

[0025] S5, integrally forming the bottom sheet on the bottom of the laminated tube body;

[0026] S6, demolding to obtain the packaging soft tube.

[0027] 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.

[0028] Compared with the prior art, the present application has the following beneficial effects:

[0029] 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 through fusion welding, the design of sealing integration is realized, and the sealing performance, overall strength and shape smoothness of the packaging soft tube are improved. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 The present application provides a cross-sectional view of a flat-bottom packaging soft tube;

[0031] Figure 2 A method for manufacturing a flat bottom packaging tube as Figure 1 schematically shown in the present application;

[0032] Figure 3 A cross-sectional view of a laminated sheet provided in the present application;

[0033] Figure 4 A schematic exploded view of Figure 1 ;

[0034] Figure 5 A schematic view of a processing method for integrally forming a discharge member in a laminated tube body;

[0035] Figure 6 A schematic view of a processing method for integrally forming a base in a laminated tube body;

[0036] Figure 7 A partial enlarged view of the base and the bottom connecting portion in Figure 1 ; DETAILED DESCRIPTION

[0037] 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 to the present application, and equivalent transformations or substitutions of functions, methods, or structures made by those of ordinary skill in the art based on these embodiments are within the scope of the present application.

[0038] Referring to Figure 1 , the present application discloses a flat bottom packaging tube 100, comprising a laminated tube body 10, a discharge 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, wherein the laminated tube body 10 is formed by welding after being enclosed by a laminated sheet, 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 decorations.

[0039] Referring to Figure 2 , the present application also provides a method for manufacturing the flat bottom packaging tube 100, which specifically comprises the following steps:

[0040] Step S1, preparing a laminated tube body 10.

[0041] Figure 3Taking the basic laminated sheet 101 structure 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 made of polyolefin as the main raw material to form a film, which has good heat sealing performance. The outer layer 106 can be made of polyolefin as the main raw material to form a film as a protective outer sealing layer according to actual application needs, or can also be selected as a material with a specific touch or texture for decoration as a material basis for product appearance creativity to improve product design competitiveness.

[0042] The barrier layer 104 is mainly classified into polymer film (also known as full plastic film) and aluminum film according to the material. The polymer film has good barrier effect on water vapor and oxygen, and can use co-extruded film of polyolefin and ethylene-vinyl alcohol copolymer (EVOH), co-extruded film of polyolefin and polyvinyl chloride (PVC), co-extruded film of polyolefin and nylon (PA), co-extruded film of polyolefin and polyamide (ONY), co-extruded film of polyolefin, ethylene-vinyl alcohol copolymer (EVOH) and polyamide, or polyethylene glycol (PVA) or polyvinylidene chloride (PVDC) coated polyolefin coated film as a barrier coating layer. When the barrier layer 104 is made of 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.

[0043] The aluminum film includes aluminum foil, aluminum plastic film, aluminum plated film, aluminum oxide film, or other films with aluminum as the core material, which has high mechanical strength, high barrier property to water vapor and oxygen, and can also effectively block ultraviolet rays.

[0044] For the polyolefin involved in the manufacture of the laminated sheet, in an embodiment, polyethylene (PE) can be used for manufacturing, and further sub-divided into low-density polyethylene (LDPE), medium-density polyethylene (MDPE), high-density polyethylene (HDPE), linear low-density polyethylene (LLDPE), etc., which can be used singly or in combination according to actual needs.

[0045] It should be noted that, Figure 3 Only as a structural diagram, in actual application, the laminated sheet 101 not only includes the inner layer 102, the barrier layer 104 and the outer layer 106, for example, an adhesive layer is also arranged between adjacent film layers, which can be made of a polyolefin layer by a coating process, or can be made by a dry composite process to bond adjacent film layers; other functional layers can also be arranged between adjacent film layers, for example, a printing layer is arranged between the barrier layer 104 and the outer layer 106, which is also a composite layer printed by stacking multiple film layers. Therefore, the number and thickness of the specific film layers of the laminated sheet 101 are not limited in the present application.

[0046] As shown in the figure Figure 4 As shown, the cut laminated sheet 101 is made into a laminated tube body 10 by a tube-making machine, so that the laminated tube body 10 has an annular bottom 11, a first opening 13 formed in the bottom 11, an annular top 12, and a second opening 14 formed in the top 12. Among them, the bottom 11 has a bottom inner peripheral surface 111 and a bottom outer peripheral surface 112. The conventional laminated tube body 10 is in a straight tube shape, that is, the diameters of the first opening 13 and the second opening 14 are the same, and the laminated tube body 10 is flexible and can be squeezed and deformed.

[0047] Step S2: Integrally form a discharging component 20 on the top 12 of the laminated tube body 10.

[0048] Figure 4 Taking the basic structure of the discharging component 20 as an example, it includes a pipe shoulder 21, a pipe head 22, and a discharging port 23 formed in the pipe head 22. In other embodiments, the configuration of the discharging component 20 can also be deformed accordingly according to actual application requirements.

[0049] The basic raw material of the discharging component 20 is polyolefin. For the processing and forming of the discharging component 20, there are mainly the following two processing processes: pre-forming the discharging component 20 by an injection molding process, and then integrally forming it on the top 12 of the laminated tube body 10 by a welding process; or directly integrally forming the discharging component 20 on the top 12 of the laminated tube body 10 by an injection molding process. The conventional discharging component 20 is rigid, that is, it has the characteristic of resisting elastic deformation.

[0050] In another embodiment, a barrier layer (not shown) is provided on the discharging component 20 to improve the barrier property of the discharging component 20. For example, the barrier layer is embedded along the extension direction of the discharging component 20.

[0051] As shown in the figure Figure 5 When injecting or welding the discharging component 20 on the top 12 of the laminated tube body 10, a first die core 51 is required to extend from the first opening 13 of the bottom 11, and the extended end of the first die core 51 extends to the end face at the second opening 14 or the end face at the discharging port 23, and then the die is closed with an outer die (not shown) for injection molding. After demolding, the bottom inner peripheral surface of the pipe shoulder 21 is connected to the top inner peripheral surface of the laminated tube body 10 and has a smooth transition, and the bottom outer peripheral surface of the pipe shoulder 21 is connected to the top outer peripheral surface of the laminated tube body 10 and has a smooth transition. Since both the material of the discharging component 20 and the material of the laminated tube body 10 contain polyolefin, the discharging component 20 and the laminated tube body 10 have high welding compatibility, so that the discharging component 20 and the laminated tube body 10 have high connection strength and good sealing performance.

[0052] Combined with Figure 1 andFigure 4 As shown, the discharge member 20 is integrally formed at the top 12 of the laminated pipe body 10 to jointly define a receiving cavity 15 with the laminated pipe body 10 for receiving material, wherein the second opening 14 is closed and the material is discharged from the discharge port 23. Since the laminated pipe body 10 is flexible, the material is pushed out of the discharge port 23 by extruding the laminated pipe body 10.

[0053] Step S3, preparation of the base sheet 30.

[0054] Referring to Figure 6 As shown, since the top 12 of the laminated pipe 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 an 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 first mold core 51 at the bottom 11 of the laminated pipe body 10 to jointly mold with an outer mold. 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 arranged at the inner bottom surface of the base sheet 30 for positioning the second mold core 52.

[0055] 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 pipe body 10.

[0056] 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 formed by the bottom surface and the side surface of the step unit. For example, in combination with Figure 7As shown, taking the setting of two - level step units as an example, the illustration includes a first - level step unit 323 and a second - level step unit 324. The first - level step unit 323 is formed by bending and extending upward from the outer edge of the first main body 31, and the second - level step unit 324 is formed by bending and extending upward from the outer edge of the first - level step unit 323. The outer peripheral surface of the first - level step unit 323 and the bottom surface of the second - level step unit 324 form an annular snap - fit structure 321. The outer peripheral surface of the second - level step unit 324 is the first outer peripheral surface 322, which is used for fitting and connecting to the inner peripheral surface 111 at the bottom of the layered tube body 10.

[0057] The positioning portion 33 is formed by protruding upward from the central region of the first inner bottom surface 312. When positioning the substrate 30 at the bottom 11 of the packaging hose 100, the positioning portion 33 protrudes toward the discharge port 23.

[0058] In one embodiment, the substrate 30 can use polyolefin as the base material and be processed by an injection - molding process. Further, along the extension direction of the first main body 31 of the substrate 30, a barrier layer (not shown) can also be embedded to improve the barrier property of the base 110. In another embodiment, the substrate 30 can also be processed from a laminated sheet material with good barrier properties.

[0059] Step S4: Assemble the substrate 30 to the laminated tube body 10.

[0060] See Figure 6 As shown, before assembling the substrate 30, first extend the second die core 52 from the discharge port 23 into the interior of the accommodation cavity 15 to a position close to the first opening 13. Then, position the positioning portion 33 of the substrate 30 at the extended end 521 of the second die core 52, and the first outer peripheral surface 322 of the substrate 30 is fitted to the inner peripheral surface 111 at the bottom of the layered tube body 10. Since the extended end 521 of the second die core 52 must be smaller than the diameter of the discharge port 23, the positioning area formed by the positioning portion 33 must be within the projection range of the discharge port 23 projected axially onto the first main body 31. In one embodiment, the positioning portion 33 is annular, and the positioning area is the inner area surrounded by the positioning portion 33. The substrate 30 is placed on the bottom 11 from the first opening 13, and the positioning portion 33 is sleeved on the extended end 521 of the second die core 52. Also, for example, in another embodiment, the positioning portion 33 is a positioning protrusion (not shown) provided at the center of the first main body 31. In the present application, the structure of the positioning portion 33 is not limited. In other alternative embodiments, the positioning portion 33 can also be of other configurations, as long as it can cooperate with the extended end 521 of the second die core 52 to position the substrate 30.

[0061] 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.

[0062] Step S5: The bottom 11 of the laminated tube body 10 forms the bottom film 40.

[0063] This application provides a base 110, which consists of the substrate 30 and the bottom film 40.

[0064] Refer Figure 6 As shown, after the substrate 30 is assembled on the laminated tube body 10, taking 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 film 40 is injection-molded, or the bottom film 40 is prefabricated first, and then the bottom film 40 is integrally welded to the bottom 11 by welding methods such as ultrasonic welding.

[0065] Refer Figure 1 and Figure 6 As shown, the bottom film 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.

[0066] 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, the second connecting portion 42 embedded in the snap-in structure 321 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 film 40 and the substrate 30, making the support of the base more stable.

[0067] 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 stronger sealing between the base 110 and the bottom 11 of the laminated tube body 10.

[0068] 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 having the second connecting portion 42 covered, and the second connecting portion 42 is formed with a third outer circumferential surface 422 located outward of 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.

[0069] Further, since the materials of the base sheet 30 and the bottom sheet 40 and the material of 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 the sealing performance between the bottom sheet 40 and the laminated tube 10 can be further enhanced.

[0070] Peeling strength test

[0071] The flat-bottomed packaging tube 100 provided in the present application is uniformly cut into strips of 1-2 cm in width along the axial direction, and the strips are stretched at 180° with the bottom 110 at a force of 10 kg, and there is no breakage at the welding portion of the laminated tube 10 and the bottom 110.

[0072] Sealing performance test

[0073] The positive pressure detection method is used to generate a pressure difference by inflating, and the gas overflow is observed. Under a pressure of 0.5 bar, the gas is blown for 10 s, and there is no bubble overflow phenomenon, and the welding portion of the laminated tube 10 and the bottom 110 is not damaged.

[0074] 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.

[0075] In an embodiment, the bottom sheet 40 can use polyolefin as the basic raw material and be processed 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 by using a laminated sheet material with good barrier property.

[0076] At least one of the base sheet 30 and the bottom sheet 40 is rigid to make the bottom 110 have good support performance.

[0077] The flat bottom packaging hose 100 manufactured by the above processing technology can be vertically placed on the bottom 11, the container is integrally formed, the appearance is smooth, the laminated pipe body 10 has good deformation ability, and the base has good bearing capacity.

[0078] The flat bottom packaging hose 100 provided by the application can select environmentally friendly and recyclable materials according to actual needs, realize full plasticization of the packaging hose 100, and meet the requirements of recycling and recycling of the packaging hose 100.

[0079] The application mode of the flat bottom packaging hose 100 is not limited, for example, the discharge component 20 can be directly connected and closed by a conventional cap (not shown). Alternatively, a dosing discharge component or a one-way valve or other functional components can be additionally provided.

[0080] The above series of detailed descriptions are only specific descriptions of the feasible embodiments of the application, and are not used to limit the protection scope of the application. Equivalent embodiments or changes made without departing from the spirit of the application should be included in the protection scope of the application.

[0081] It is obvious for those skilled in the art that the application is not limited to the details of the above exemplary embodiments, and the application can be realized in other specific forms without departing from the spirit or essential characteristics of the application. Therefore, the embodiments should be regarded as exemplary and non-limiting, the scope of the 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 application. Any reference signs in the claims should not be regarded as limiting the claims.

[0082] Furthermore, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains 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 application relates to a laminated pipe body and a base. The laminated pipe body is formed by a laminated sheet and 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 part 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 comprises a base sheet and a bottom sheet. The base sheet has a first main body and a first connecting part formed at the outer edge of the first main body, the first connecting part 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 part towards the side where the laminated pipe body is located. The bottom sheet has a second main body and a second connecting part formed at the outer edge of the second main body, the second main body is connected to the first main body, the second connecting part is embedded in the snap structure, the second connecting part is formed with a second outer circumferential surface, and the second outer circumferential surface is connected to the inner circumferential surface of the bottom. The longitudinal section of the first connecting part comprises two-stage step units, the two-stage step units comprise a first-stage step unit and a second-stage step unit, the first-stage step unit is formed by upwardly bending and extending the outer edge of the first main body, the second-stage step unit is formed by upwardly bending and extending the outer edge of the first-stage step unit, the outer circumferential surface of the first-stage step unit and the bottom surface of the second-stage step unit form a ring-shaped snap structure, and the outer circumferential surface of the second-stage step unit is the first outer circumferential surface used for being connected to the inner circumferential surface of the bottom of the laminated pipe body.

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 part is located in 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 part is ring-shaped, and the positioning area is an inner area formed by the positioning part.

4. The flat bottomed packaging tube of claim 1, wherein, 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.

5. The flat bottomed packaging tube of claim 1, wherein, 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 part covering the second connecting part, the second connecting part 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 are smoothly connected and transitioned.

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 part 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 part 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 part, 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 application further discloses a preparation method of the laminated pipe body and the base. S1, preparing the laminated pipe body; S2, integrally forming the discharging part on the top of the laminated pipe body; S3, preparing the base sheet; S4, assembling the substrate to the laminated tube body: inserting a mold core from the discharge port to extend to the bottom, positioning the positioning portion of the substrate at the end of the mold core, and positioning the first outer peripheral surface of the first connecting portion to the inner peripheral surface of the bottom of the laminated tube body; S5, integrally forming the bottom sheet at the bottom of the laminated tube body; S6, demolding to obtain the packaging hose.

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 substrate 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 substrate and the inner peripheral surface of the bottom of the laminated tube body.

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