Packaging hose welding structure

Abstract

The utility model discloses a kind of packaging hose welding structures, can improve the connection strength and sealing property of packaging hose joint position. Packaging hose welding structure includes hose body, the hose body is wound by including inner protective layer, middle material layer and outer protective layer sheet-shaped raw material, the two side edges of sheet-shaped raw material coincide in the position of joint, and the outer surface of the joint is provided with an outer protective strip;The outer protective strip is adhered on the surface of the hose body by hot-pressing fusion bonding mode, the two side edges of sheet-shaped raw material are covered in inner in its left and right sides, and the length direction of the outer protective strip extends along the joint;The inner protective layer, outer protective layer and outer protective strip are the material that can be adhered.

Description

Technical Field

[0001] This utility model belongs to the field of packaging hose technology, and specifically refers to a welding structure for packaging hoses. Background Technology

[0002] Packaging tubes are typically formed from sheet materials through processes such as winding and welding, and are widely used in pharmaceuticals, cosmetics, and other fields. The two edges of the sheet material partially overlap after winding, and are then joined together at the overlap point using ultrasonic welding or hot pressing. Early sheet materials were made of a single material with the same properties, allowing for a strong connection at the overlap point during ultrasonic welding or hot pressing.

[0003] Some existing packaging tube products consist of three layers: an inner, middle, and outer layer. The middle layer is made of plant-based or biological materials such as paper or bamboo, while the inner and outer layers are waterproof plastic layers that enclose the middle layer, providing isolation and protection to prevent corrosive contact with cosmetics, medicines, etc. A problem arises during production: after the tube is wound, overlapped, heated, and pressurized, the middle layer material develops irregular wrinkles of uncontrollable shape. The inner and outer layers, when heated and melted, become liquid and fill these wrinkles, while also overflowing due to pressure, causing the overlapping areas to adhere. However, product inspections have revealed that this process easily exposes the middle layer material, affecting the appearance, and the adhesion strength is low, potentially failing to meet quality requirements. Utility Model Content

[0004] The main purpose of this utility model is to provide a welding structure for packaging hoses, which solves the problems existing in the prior art and can improve the connection strength and sealing performance of the joints of packaging hoses.

[0005] To achieve the above objectives, the solution of this utility model is:

[0006] A welding structure for a packaging hose includes a hose body, which is formed by winding a sheet of raw material comprising an inner protective layer, a middle material layer, and an outer protective layer. The two sides of the sheet of raw material overlap at the seam, and an outer protective strip is provided on the outer surface of the seam. The outer protective strip is bonded to the surface of the hose body by hot pressing and welding, with its left and right sides respectively covering the two sides of the sheet of raw material, and the length direction of the outer protective strip extends along the seam. The inner protective layer, the outer protective layer, and the outer protective strip are made of adhesive materials.

[0007] The inner protective layer, outer protective layer, and outer protective strip are all made of plastic.

[0008] Preferably, the inner protective layer, the outer protective layer, and the outer protective strip are all made of polyethylene material.

[0009] The middle material layer is a recycled, secondary, or biodegradable material made from plant or biological materials.

[0010] Preferably, the biodegradable material is polylactide.

[0011] After adopting the above technical solution, the present invention has the following technical effects:

[0012] This invention features an outer protective strip positioned at the overlapping points of the two sides of a sheet-like raw material. The left and right sides of the outer protective strip cover both sides of the sheet-like raw material and are bonded to the outer protective layer via hot-pressing. This increases the tensile strength between the two sides of the outer protective layer, thereby increasing its strength and making it less prone to breakage. Furthermore, since the inner protective layer, outer protective layer, and outer protective strip are made of adhesive materials with excellent compatibility, during the hot-pressing process, the three materials at the joint melt and form a unified whole. The additional outer protective strip increases the material volume, allowing it to completely fill the folds created by heating and pressurizing the inner material layer. It also allows for overflow flow to areas beyond the sides of the inner material layer, completely covering it without exposing either side, ultimately improving the sealing performance of the packaging tube. Attached Figure Description

[0013] Figure 1 This is a structural schematic diagram of a specific embodiment of the present utility model.

[0014] Figure 2 This is a cross-sectional view of the processing procedure of a specific embodiment of the present utility model.

[0015] Figure 3 This is a perspective view of the processing procedure of a specific embodiment of the present utility model.

[0016] Explanation of icon numbers:

[0017] 1- Hose body; 11- Inner protective layer; 12- Middle material layer; 13- Outer protective layer; 14- Outer protective strip;

[0018] 2-Center shaping mold;

[0019] A-Seam. Detailed Implementation

[0020] To further explain the technical solution of this utility model, the following detailed description is provided through specific embodiments.

[0021] refer to Figure 1As shown, this utility model discloses a welding structure for a packaging hose, including a hose body 1. The hose body 1 is formed by winding a sheet material containing an inner protective layer 11, a middle material layer 12, and an outer protective layer 13. The two sides of the sheet material overlap at the joint A, and an outer protective strip 14 is provided on the outer surface of the joint. The outer protective strip 14 is bonded to the surface of the hose body 1 by hot pressing and welding, and its left and right sides cover the two sides of the sheet material respectively. The length direction of the outer protective strip 14 extends along the joint A. The inner protective layer 11, the outer protective layer 13, and the outer protective strip 14 are materials that can be bonded together.

[0022] Through the above solution, this utility model sets an outer protective strip 14 at the overlapping position of the two sides of the sheet material. The left and right sides of the outer protective strip 14 cover the two sides of the sheet material respectively, and are bonded to the outer protective layer 13 by hot pressing. This can increase the tensile strength between the two sides of the outer protective layer 13, thereby increasing the strength and making it less likely to break. At the same time, since the inner protective layer 11, the outer protective layer 13 and the outer protective strip 14 are adhesive materials with excellent material compatibility, when the hot pressing process is carried out, the three materials at the joint A position are melted and formed into one. The additional outer protective strip 14 increases the amount of material, which can completely fill the wrinkles of the middle material layer 12 caused by heating and pressurization. At the same time, it can also overflow and flow to the position outside the side of the middle material layer 12, completely covering the middle material layer 12, and its two sides will not be exposed, ultimately improving the sealing performance of the packaging tube.

[0023] The following are specific embodiments of the present invention.

[0024] refer to Figure 2 , 3 As shown, during processing, the sheet material is wound around the circumference of the central shaping mold 2 using left and right outer winding forming mechanisms, so that the two sides of the sheet material overlap above the central shaping mold 2, forming seam A. Then, the outer protective strip 14 is gradually attached to the upper part of seam A along the axial direction of the central shaping mold 2. Finally, a hot pressing mechanism is used to heat and press the outer protective strip 14 at the overlapping position (i.e., seam A), pressing it firmly into the mold of the central shaping mold 2. After cooling and demolding, the product is obtained. Figure 1 The packaging tube shown. It should be noted that... Figures 1 to 3 In order to show the structure, the shape features are enlarged. In reality, after heat pressing, the inner and outer surfaces of the seam A of the packaging tube do not have such obvious undulations.

[0025] The materials of the inner protective layer 11, the outer protective layer 13, and the outer protective strip 14 are all plastic.

[0026] Furthermore, the aforementioned inner protective layer 11, outer protective layer 13, and outer protective strip 14 need to possess the following characteristics: (1) high barrier properties, preventing leakage and volatilization of the contents, excellent blocking effect against odors, effectively blocking gases such as oxygen, extending the shelf life of the contents, and preventing oxidation; (2) good processability (thermal properties), facilitating product manufacturing needs; and (3) good transparency. Therefore, materials such as polyethylene and ethylene alcohol copolymer (EVOH) can be selected.

[0027] The aforementioned material layer 12 is made of plant-based or biological recycled materials, secondary materials, or biodegradable materials to achieve environmental protection goals.

[0028] Furthermore, the aforementioned recycled materials refer to recyclable waste; secondary materials refer to scraps, sprues, and defective products generated during production, which are crushed and then added; biodegradable materials refer to materials that can be decomposed by microorganisms in the natural environment, and their decomposition products are usually harmless substances such as carbon dioxide and water. These materials help reduce environmental pollution and are important research objects for materials used in the field of environmental protection. For example, polylactide (PLA, also known as polylactic acid) is a biodegradable polymer material belonging to polyester compounds. It is mainly produced by the polymerization reaction of lactic acid and is widely used in biomedicine, packaging materials, and 3D printing.

[0029] The above embodiments and figures are not intended to limit the product form and style of this utility model. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of this utility model.

Claims

1. A welding structure for a packaging flexible tube, characterized in that: The device includes a hose body, which is made of a sheet material comprising an inner protective layer, a middle material layer, and an outer protective layer, with the two sides of the sheet material overlapping at the seam, and an outer protective strip provided on the outer surface of the seam; the outer protective strip is bonded to the surface of the hose body by hot pressing, with its left and right sides respectively covering the two sides of the sheet material, and the length of the outer protective strip extending along the seam; the inner protective layer, the outer protective layer, and the outer protective strip are made of adhesive materials.

2. The packaging hose welding structure as described in claim 1, characterized in that: The inner protective layer, outer protective layer, and outer protective strip are all made of plastic.

3. The packaging hose welding structure as described in claim 2, characterized in that: The inner protective layer, outer protective layer, and outer protective strip are all made of polyethylene material.

4. The packaging hose welding structure as described in claim 1, characterized in that: The middle material layer is a recycled, secondary, or biodegradable material made from plant or biological materials.

5. The packaging hose welding structure as described in claim 4, characterized in that: The biodegradable material is polylactide.

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