TPE soft rubber head hose

Abstract

The invention discloses a TPE (thermoplastic elastomer) soft rubber head hose. The hose comprises a hose body and an injection head, the pipe body is of a five-layer co-extrusion structure and sequentially comprises an outer layer, a first bonding layer, a second blocking layer, a second bonding layer and an inner layer from outside to inside, a hanging table and a buckling position are arranged at the top of the pipe body, the injection head and the pipe body are integrally formed through a mold and a segmented injection process, and the injection head is made of TPE materials. According to the TPE soft rubber head hose, the touch feeling is improved through the TPE injection head, the barrier property and the production yield are optimized through the five-layer co-extrusion process, and meanwhile the problem of interface bonding strength of TPE / PE heterogeneous materials is solved by combining the segmented injection molding with the hose body structure.

Description

Technical Field

[0001] The present invention relates to the technical field of hoses, and more particularly to a TPE soft rubber head hose. Background Art

[0002] Due to its portability and sealing advantages, hose packaging is widely used in the fields of cosmetics, medicine, etc. Traditional hoses are mostly made of polyethylene (PE) material, and their injection heads are usually hard PE structures, which have significant defects: (1) Poor tactile experience: The hard injection head is stiff and cold when in contact with the skin, which is especially bad for products such as creams and lotions that need to be squeezed directly onto the skin, reducing the user experience; (2) Difficulty in combining heterogeneous materials: If soft thermoplastic elastomer (TPE) is used for the injection head to improve the tactile feel, due to the difference in molecular structure and melting temperature between TPE and PE, the traditional injection molding process is prone to delamination or shedding of the bonding interface.

[0003] Therefore, there is an urgent need to develop a hose structure that has skin-friendly touch, high barrier properties, reliable one-piece molding of heterogeneous materials, and is suitable for efficient production. Summary of the Invention

[0004] In response to the shortcomings of the existing technology, the present invention provides a TPE soft rubber head hose, which improves the touch by adopting a TPE injection nozzle, and optimizes the barrier properties and production yield through a five-layer co-extrusion process. At the same time, the segmented injection molding is combined with the tube body structure to solve the problem of interface bonding strength of TPE / PE heterogeneous materials.

[0005] To achieve the above object, the present invention provides the following technical solutions: A TPE soft rubber hose, comprising a tube body and an injection nozzle, wherein the tube body comprises, from the outside to the inside, an outer layer, a first adhesive layer, a barrier layer, a second adhesive layer and an inner layer, and the injection nozzle is made of TPE material; The preparation method of TPE soft rubber hose is as follows: S1. Dry the raw materials. Place the tube body and nozzle raw materials into a hot air hopper and dry them for 3 hours at a drying temperature of 110-120°C. S2, tube body forming, adding the tube body raw material into the extrusion equipment, undergoing plasticization, extrusion molding, cooling and shaping, and pulling and cutting, finally forming the tube body; S3, injection head molding, placing the tube body in a molding mold, and molding the injection head on the top of the tube body by segmented injection, so that the injection head and the tube body are molded as one.

[0006] Furthermore, when the injection head is segmented for injection molding, the pressure of the first segment is 21 Bar, the speed is 18%, and the time is 1.85 s; the pressure of the second segment is 20 Bar, the speed is 18%, and the time is 0.41 s; the pressure of the third segment is 20 Bar, the speed is 18%, and the time is 0.54 s, and the holding time is 4 s.

[0007] Furthermore, a hanging platform and a buckle position are provided on the top of the tube body, and the injection head is located at the hanging platform and the buckle position and is integrally formed with the tube body.

[0008] Furthermore, when the tube body is extruded in step S2, the molding temperature of the inner and outer layers is 150-180°C, the molding temperature of the barrier layer is 170-190°C, the temperature of the adhesive layer is 160-180°C, the extrusion speed of the outer layer is 900-1000 rpm, the extrusion speed of the barrier layer is 500-600 rpm, the extrusion speed of the adhesive layer is 850-1000 rpm, and the extrusion speed of the inner layer is 1000-1100 rpm.

[0009] Furthermore, the material of the barrier layer is ethylene-vinyl alcohol copolymer.

[0010] Furthermore, the materials of the outer layer and the inner layer are both polyethylene.

[0011] Furthermore, the materials of the first adhesive layer and the second adhesive layer are both maleic anhydride modified polyolefin.

[0012] Furthermore, during the injection molding, the melt temperature is 193-227°C and the mold temperature is 16-38°C.

[0013] Furthermore, the shape of the injection head is one of circular, elliptical, square, rectangular, triangular or special shape.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. Significantly improve user experience The injection head uses soft TPE material instead of traditional hard PE, which is soft and skin-friendly, and is especially suitable for scenarios where cosmetics and other products come into direct contact with the skin.

[0015] 2. Breakthrough in the technical barriers of heterogeneous material one-piece molding The first reliable combination of PE tube body and TPE injection nozzle: Through a staged injection molding process (stage 1: 21 Bar / 18% / 1.85 s; stage 2: 20 Bar / 18% / 0.41 s; stage 3: 20 Bar / 18% / 0.54 s; holding pressure 4 s), the matching of TPE injection temperature (193–227°C) and PE melting temperature (150–180°C) is precisely controlled to overcome material compatibility issues. 3. Enhance structural reliability The top of the tube body is designed with a hanging platform and buckle position to increase the contact area between the TPE injection head and the PE tube body, thereby improving the bonding strength of heterogeneous materials and eliminating the risk of falling off.

[0016] 4. High barrier properties and production efficiency Five-layer co-extruded tube structure (outer layer / adhesive layer / barrier layer / adhesive layer / inner layer): The barrier layer effectively isolates oxygen and protects the contents; Adhesive layer (maleic anhydride modified polyolefin) ensures interlayer bonding; Layered extrusion process optimization: Independently control the temperature and speed of each layer (e.g. 900–1000 rpm for the outer layer, 500–600 rpm for the barrier layer) to improve yield and production capacity.

[0017] 5. Strong process universality Supports a variety of nozzle shapes (round, oval, square, special shape, etc.) to meet the needs of high-end cosmetics packaging. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive work, among which: Figure 1 This is a schematic diagram of the structure of a TPE soft rubber hose; Figure 2 Schematic diagram of the tube structure.

[0019] The markings in the figure are: 1. hanging platform; 2. buckle position; 3. injection head; 4. tube body; 5. outer layer; 6. first adhesive layer; 7. barrier layer; 8. second adhesive layer; 9. inner layer. DETAILED DESCRIPTION

[0020] In the description of the present invention, it should be noted that, for directional words, such as the terms "center", "horizontal (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like, indicating directions and positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and cannot be understood as limiting the specific scope of protection of the present invention.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Therefore, the terms "first" and "second" may explicitly or implicitly refer to one or more of these features. Throughout the description of the present invention, "several" and "a number" mean two or more, unless otherwise specifically defined.

[0022] A TPE soft rubber hose, comprising a tube body 4 and an injection nozzle 3. The tube body 4 comprises, from outside to inside, an outer layer 5, a first adhesive layer 6, a barrier layer 7, a second adhesive layer 8 and an inner layer 9. The injection nozzle 3 is made of TPE material. The preparation method of TPE soft rubber hose is as follows: S1, raw material drying, put the tube body 4 and injection head 3 raw materials into the hot air hopper and dry them for 3 hours at a drying temperature of 110℃-120℃; S2, forming the tube body 4, adding the raw material of the tube body 4 into the extrusion equipment, undergoing plasticization, extrusion molding, cooling and shaping, and pulling and cutting, finally forming the tube body 4; S3, injection nozzle 3 is formed, the tube body 4 is placed in the forming mold, and the injection nozzle 3 is formed on the top of the tube body 4 by segmented injection, so that the injection nozzle 3 and the tube body 4 are formed as one piece.

[0023] Preferably, when the injection head 3 is segmented for injection molding, the pressure of the first segment is 21 Bar, the speed is 18%, and the time is 1.85 s; the pressure of the second segment is 20 Bar, the speed is 18%, and the time is 0.41 s; the pressure of the third segment is 20 Bar, the speed is 18%, and the time is 0.54 s, and the holding time is 4 s.

[0024] Preferably, a hanging platform 1 and a buckle position 2 are provided on the top of the tube body 4 , and the injection head 3 is located at the hanging platform 1 and the buckle position 2 and is integrally formed with the tube body 4 .

[0025] Preferably, when the tube body 4 is extruded in step S2, the molding temperature of the inner layer 9 and the outer layer 5 is 150-180° C., the molding temperature of the barrier layer 7 is 170-190° C., the temperature of the adhesive layer is 160-180° C., the extrusion speed of the outer layer 5 is 900-1000 rpm, the extrusion speed of the barrier layer 7 is 500-600 rpm, the extrusion speed of the adhesive layer is 850-1000 rpm, and the extrusion speed of the inner layer 9 is 1000-1100 rpm. Specifically, the raw material of the tube body 4 is first added into the extruder barrel. Under the action of the rotating extruder screw, the heated plastic is transported forward along the spiral groove of the screw. During this process, the raw material is continuously heated and gradually melts into a viscous flow state. Then, under the action of the extrusion system, the plastic melt passes through the extruder head die and a series of auxiliary devices such as shaping, cooling, pulling, and cutting to obtain the tube body 4.

[0026] In the co-extrusion process, the extrusion process can be divided into four stages: (1) Plasticizing stage: temperature setting 180~190℃; (2) Extrusion molding stage; temperature setting 150~180℃; (3) Cooling and shaping stage; the temperature is set at 60~80℃; (4) Pulling and cutting of plastic parts.

[0027] Specifically, the process parameters of extrusion molding mainly include temperature, extrusion speed, vacuum degree, pulling speed, etc. The extrusion molding temperature is as follows: Table 1. Temperature control of extrusion molding The extrusion speed is shown in Table 2 below: Table 2. Diameter and speed of screw of each layer extruder The sizing of hoses is usually done by using a vacuum external sizing process, and the vacuum degree is usually set at 0.02Mpa.

[0028] Preferably, the material of the barrier layer 7 is ethylene-vinyl alcohol copolymer.

[0029] Preferably, the outer layer 5 and the inner layer 9 are both made of polyethylene.

[0030] Preferably, the materials of the first adhesive layer 6 and the second adhesive layer 8 are both maleic anhydride modified polyolefin.

[0031] Preferably, when the injection nozzle 3 is formed, the melt temperature is 193-227°C and the mold temperature is 16-38°C.

[0032] Preferably, the shape of the injection head 3 is one of circular, elliptical, square, rectangular, triangular or special shape.

[0033] advantage: 1. Significantly improve user experience The injection head 3 uses soft TPE material instead of traditional hard PE, which is soft and skin-friendly, and is especially suitable for scenes where cosmetics and other products come into direct contact with the skin.

[0034] 2. Breakthrough in the technical barriers of heterogeneous material one-piece molding The first reliable combination of PE tube body 4 and TPE injection head 3: Through a staged injection molding process (stage 1: 21 Bar / 18% / 1.85 s; stage 2: 20 Bar / 18% / 0.41 s; stage 3: 20 Bar / 18% / 0.54 s; holding pressure 4 s), the matching of TPE injection temperature (193–227°C) and PE melting temperature (150–180°C) is precisely controlled to overcome material compatibility issues. 3. Enhance structural reliability The top of the tube body 4 is designed with a hanging platform 1 and a buckle position 2 to increase the contact area between the TPE injection head 3 and the PE tube body 4, thereby improving the bonding strength of the heterogeneous materials and eliminating the risk of falling off.

[0035] 4. High barrier properties and production efficiency Five-layer co-extruded tube body 4 structure (outer layer 5 / adhesive layer / barrier layer 7 / adhesive layer / inner layer 9): The barrier layer 7 effectively isolates oxygen and protects the contents; Adhesive layer (maleic anhydride modified polyolefin) ensures interlayer bonding; Layered extrusion process optimization: Independently control the temperature and rotation speed of each layer (e.g., 5900–1000 rpm for the outer layer and 7500–600 rpm for the barrier layer) to improve yield and production capacity.

[0036] 5. Strong process universality Supports a variety of nozzle shapes (round, oval, square, special shape, etc.) to meet the needs of high-end cosmetics packaging.

[0037] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A TPE soft rubber hose, characterized by: The tube body and the injection nozzle, the tube body includes, from the outside to the inside, an outer layer, a first adhesive layer, a barrier layer, a second adhesive layer and an inner layer, and the injection nozzle is made of TPE material; The preparation method of TPE soft rubber hose is as follows: S1. Dry the raw materials. Place the tube body and nozzle raw materials into a hot air hopper and dry them for 3 hours at a drying temperature of 110-120°C. S2, tube body forming, adding the tube body raw material into the extrusion equipment, undergoing plasticization, extrusion molding, cooling and shaping, and pulling and cutting, finally forming the tube body; S3, injection head molding, placing the tube body in a molding mold, and molding the injection head on the top of the tube body by segmented injection, so that the injection head and the tube body are molded as one.

2. The TPE soft rubber hose according to claim 1, characterized in that: When the injection head is segmented for injection molding, the pressure of the first segment is 21 Bar, the speed is 18%, and the time is 1.85 s; the pressure of the second segment is 20 Bar, the speed is 18%, and the time is 0.41 s; the pressure of the third segment is 20 Bar, the speed is 18%, and the time is 0.54 s, and the holding time is 4 s.

3. The TPE soft rubber hose according to claim 1, characterized in that: The top of the tube body is provided with a hanging platform and a buckle position, and the injection head is located at the hanging platform and the buckle position and is formed integrally with the tube body.

4. The TPE soft rubber hose according to claim 1, characterized in that: During the extrusion molding of the tube body in step S2, the molding temperature of the inner and outer layers is 150-180°C, the molding temperature of the barrier layer is 170-190°C, the temperature of the adhesive layer is 160-180°C, the extrusion speed of the outer layer is 900-1000 rpm, the extrusion speed of the barrier layer is 500-600 rpm, the extrusion speed of the adhesive layer is 850-1000 rpm, and the extrusion speed of the inner layer is 1000-1100 rpm.

5. The TPE soft rubber hose according to claim 1, characterized in that: The material of the barrier layer is ethylene-vinyl alcohol copolymer.

6. The TPE soft rubber hose according to claim 1, characterized in that: The materials of the outer layer and the inner layer are both polyethylene.

7. The TPE soft rubber hose according to claim 1, characterized in that: The materials of the first adhesive layer and the second adhesive layer are both maleic anhydride modified polyolefin.

8. The TPE soft rubber hose according to claim 1, characterized in that: During injection molding, the melt temperature is 193-227°C and the mold temperature is 16-38°C.

9. The TPE soft rubber hose according to claim 1, characterized in that: The shape of the injection head is one of circular, elliptical, square, rectangular, triangular or special shape.

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