PET thermos bottle and preparation process thereof

Abstract

The invention provides a PET thermos bottle which is of a double-layer hollow PET bottle structure, aerogel is arranged in the double-layer hollow structure to serve as a heat insulation layer, the hollow structure is vacuumized to be semi-vacuum, the aerogel layer is tightly clamped by the inner bottle wall and the outer bottle wall, the aerogel is not loosened, and the better heat preservation effect is achieved. According to the invention, the double-layer PET and the aerogel are combined, so that the thermos bottle is very light and low in price; the heat preservation time of cold drinks or hot drinks is longer, and the heat preservation effect is better than that of a stainless steel thermos bottle; and the bottle body is light, so that the carrying capacity is more.

Description

Technical Field

[0001] This invention discloses a PET thermos bottle and its manufacturing process, belonging to the field of packaging technology. Background Technology

[0002] Traditional thermos flasks are mostly made of hollow glass, such as the EP16812762.9 glass container, which is used for thermos flasks. The document also mentions traditional hollow stainless steel containers with a vacuum-sealed interlayer to create an insulated space. Glass thermos flasks are not shatterproof, while stainless steel thermos flasks are more expensive. Glass thermos flasks are not suitable for outdoor activities, and stainless steel thermos flasks are heavier than glass thermos flasks, generally smaller, and cannot hold much hot water. Furthermore, stainless steel thermos flasks have a poorer heat retention effect than glass thermos flasks.

[0003] The current demand is for a thermos that is impact-resistant, has good heat retention, and is lightweight. Summary of the Invention

[0004] To address the above problems, this invention provides a PET thermos bottle and its preparation method. The thermos bottle is characterized by being impact-resistant, having good heat preservation effect, and being lightweight.

[0005] The technical solution provided by this invention is: a PET thermos bottle, which adopts a double-layer hollow PET bottle structure, in which aerogel is set as a heat insulation layer in the two hollow structures, and the hollow structure is evacuated to a semi-vacuum, so that the inner and outer bottle walls tightly clamp the aerogel layer to prevent the aerogel from loosening, thereby achieving a better heat preservation effect.

[0006] Furthermore, the semi-vacuum refers to a pressure between 1000 and 5000 Pa. Below 1000 Pa, the process is difficult and not conducive to mass production, and the pressure on the PET bottle wall increases, resulting in no cost-effectiveness advantage. Above 5000 Pa, airflow convection heat transfer is enhanced, and the heat preservation effect decreases.

[0007] To achieve the above structure and enable mass production, the preparation method provided in this invention is as follows: A combination of blow molding, molding, and vacuum forming is used. The inner bottle is blow molded, and the aerogel layer is molded into two half-shell structures. The two molded aerogel half-shells are then attached to the outer wall of the inner bottle using adhesive or film wrapping. The inner bottle with the aerogel fixed serves as a mold, placed on a vacuum forming machine for vacuum forming of the outer PET layer. Excess material from the outer bottle is then cut using ultrasonic waves or heat melting, fusing the outer bottle opening to the lower end of the inner bottle opening. Alternatively, the inner bottle can be used as an inner mold, filled with a filling liquid for support. The aerogel is then molded onto the outside of the inner bottle in one step using the outer mold, followed by vacuum forming of the outer bottle. Blow molding is a conventional and mature process, and will not be elaborated further.

[0008] Furthermore, a thin film layer with a reflective coating is applied to the outer wall of the outer bottle as a radiation reflective layer to achieve better heat preservation.

[0009] Furthermore, the molding process refers to: after the inner and outer molds are closed, the prepared aerogel sol is injected from the mold gate to fill the mold cavity, and then placed in an environment of -10° to 0° to allow the aerogel to complete the hydrolysis and condensation reaction. After molding, the mold can be opened to remove the aerogel interlayer of the half-shell. Alternatively, the PET inner bottle can be used as the inner mold for aerogel molding. It is placed in the outer mold using a tooling, and then the aerogel sol is injected into the interlayer between the PET inner bottle and the outer mold. After molding, the outer mold is opened to obtain the inner bottle covered with aerogel. The inner bottle covered with aerogel is then fixed on the template of the vacuum forming machine as a vacuum forming mold to vacuum form the outer PET bottle wall. The vacuum forming port is set at the bottle mouth of the inner and outer bottles. After vacuum forming is completed, the excess scrap material outside the outer PET bottle mouth is cut off by using metal tooling or molds through ultrasonic or hot melt methods, thus completing the production of the entire PET thermos bottle.

[0010] The beneficial technical effects of this invention are: 1. The combination of double-layer PET and aerogel makes the thermos bottle very lightweight and inexpensive; 2. It keeps cold or hot drinks warm for a longer time, and its heat preservation effect is better than that of stainless steel thermos flasks; 3. Convenient to carry when traveling or engaging in outdoor activities; the lightweight bottle allows for carrying more. Detailed Implementation Example

[0011] The PET thermos bottle adopts a double-layer hollow PET bottle structure, with aerogel as the heat insulation layer in the two hollow structures. The hollow structure is evacuated to 3000 Pa, so that the inner and outer bottle walls tightly clamp the aerogel layer to prevent the aerogel from loosening and achieve better heat preservation effect.

[0012] The manufacturing method of PET thermos bottles is as follows: a combination of blow molding, molding, and vacuum forming is used. The inner bottle is blow molded, and the aerogel layer is molded into two half-shell structures. The two molded aerogel half-shells are then attached to the outer wall of the inner bottle with adhesive or film wrapping. The inner bottle with the aerogel fixed is used as a mold and placed on a vacuum forming machine for vacuum forming the outer PET layer. Excess material from the outer bottle is then cut off using ultrasonic waves or heat melting, so that the outer bottle opening is fused to the lower end of the inner bottle opening. Alternatively, the inner bottle can be used as an inner mold, filled with a filling liquid for support, and then the aerogel is formed onto the outside of the inner bottle in one step using the outer mold, followed by vacuum forming of the outer bottle. Blow molding is a conventional and mature process, and will not be elaborated further. A thin film layer with a reflective coating is applied to the outer wall of the bottle as a radiation reflective layer to achieve better heat preservation.

[0013] Molding refers to the process of using inner and outer molds, injecting prepared aerogel sol through the mold gate to fill the mold cavity, and then placing it in an environment of -10°C to 0°C to allow the aerogel to complete the hydrolysis and condensation reaction. After molding, the mold can be opened to remove the aerogel interlayer of the half-shell. Alternatively, a PET inner bottle can be used as the inner mold for aerogel molding. It is placed in the outer mold using tooling, and then aerogel sol is injected into the interlayer between the PET inner bottle and the outer mold. After molding, the outer mold is opened to obtain the inner bottle covered with aerogel. The inner bottle covered with aerogel is then fixed on the template of a vacuum forming machine as a vacuum forming mold to vacuum form the outer PET bottle wall. The vacuum forming port is set at the bottle opening of both the inner and outer bottles. After vacuum forming, the excess scrap material outside the PET bottle opening is removed using metal tooling or molds by ultrasonic or hot melt methods, thus completing the production of the entire PET thermos bottle.

[0014] The above embodiments are explanations and descriptions of the technical solutions of the present invention, and should not be regarded as limitations on the technical solutions of the present invention. Simple modifications or modifications in combination with the prior art based on the present invention are all within the protection scope of the present invention.

Claims

1. A PET thermos bottle, characterized in that: The bottle adopts a double-layer hollow PET bottle structure, with aerogel as a heat insulation layer in the two hollow layers. The hollow structure is evacuated to a semi-vacuum, so that the inner and outer bottle walls tightly clamp the aerogel layer and prevent the aerogel from loosening.

2. The PET thermos bottle according to claim 1, characterized in that: The term "semi-vacuum" refers to a pressure between 1000 and 5000 Pa.

3. The method for preparing a PET thermos bottle according to claim 1, characterized in that: The process combines blow molding, molding, and vacuum forming. The inner bottle is blow molded, while the aerogel layer is molded into two half-shell structures. These two aerogel half-shells are then attached to the outer wall of the inner bottle using adhesive or film wrapping. The inner bottle with the aerogel in place serves as a mold, which is then placed on a vacuum forming machine for vacuum forming the outer PET layer. Excess material from the outer bottle is cut off using ultrasonic or heat-melting methods, allowing the outer bottle opening to fuse to the lower end of the inner bottle opening. Alternatively, the inner bottle can be used as an inner mold, filled with a filling liquid for support. The aerogel is then molded onto the outside of the inner bottle in one step using the outer mold, followed by vacuum forming of the outer bottle.

4. The PET thermos bottle according to claim 3, characterized in that: A thin film layer with a reflective coating is applied to the outer wall of the outer bottle as a radiation reflective layer.

5. The PET thermos bottle according to claim 3, characterized in that: The molding process involves: after the inner and outer molds are closed, the prepared aerogel sol is injected from the mold gate to fill the mold cavity. The cavity is then placed in an environment of -10°C to 0°C and allowed to stand until the aerogel completes its hydrolysis and condensation reaction. Once formed, the mold can be opened to remove the aerogel interlayer of the half-shell. Alternatively, a PET inner bottle can be used as the inner mold for aerogel molding. It is placed in the outer mold using a tooling, and aerogel sol is injected into the interlayer between the PET inner bottle and the outer mold. After molding, the outer mold is opened to obtain the aerogel-coated inner bottle. The aerogel-coated inner bottle is then fixed on the template of a vacuum forming machine as a vacuum forming mold to vacuum form the outer PET bottle wall. The vacuum forming port is located at the bottle opening of both the inner and outer bottles. After vacuum forming, excess material outside the outer PET bottle opening is removed using ultrasonic or hot-melt methods with metal tooling or molds, thus completing the production of the entire PET thermos bottle.