Heat retaining structure

Abstract

A heat retaining structure, comprising a main unit and a composite fiber unit, the main unit having a fiber substrate and at least one metal layer formed on one surface of the fiber substrate, the composite fiber unit being located on the surface of the main unit, comprising a plurality of fiber balls and a plurality of short fibers dispersed among the fiber balls, the length of the short fibers being not greater than the diameter of the fiber balls, and the melting point of the short fibers being lower than that of the fiber balls, the fiber balls and the short fibers forming a fluffy structure, and the fiber substrate being plated with at least one metal layer to achieve the effect of retaining temperature.

Description

Technical Field

[0001] This utility model relates to a thermal insulation structure, and more particularly to a composite layered thermal insulation structure. Background Technology

[0002] In daily life, items like winter clothing and insulated bags for carrying food are specially designed in terms of materials and structure to effectively maintain internal temperature. For example, to ensure long-sleeved clothing has good warmth retention, less breathable materials are chosen for the fabric, and an inner layer made of feathers or fluffy wool is added to achieve the purpose of insulation. Insulated bags, on the other hand, are usually designed with layers such as foam, polystyrene (expandable polystyrene, EPS), or an additional metal layer on the inner surface of the fabric to better maintain the temperature of the food itself.

[0003] In the aforementioned prior art, heat preservation or insulation structures mainly rely on adding an air layer to reduce the rate of heat conduction or to further block heat radiation, thus preventing the temperature from dropping too quickly due to the rapid alternation between internal and external temperatures. However, how to design other structures that can maintain temperature and provide users with more diverse options is an area that researchers in related fields urgently need to overcome. Utility Model Content

[0004] The purpose of this invention is to provide a thermal insulation structure with good thermal insulation effect.

[0005] The present invention provides a thermal insulation structure comprising a main body unit and a composite fiber unit.

[0006] The main unit has a fiber substrate and at least one metal layer formed on one of the surfaces of the fiber substrate.

[0007] The composite fiber unit is located on the surface of the main unit and includes several fiber balls and several short fibers dispersed among the fiber balls. The length of the short fibers is not greater than the diameter of the fiber balls, and the melting point of the short fibers is lower than that of the fiber balls.

[0008] Preferably, in the thermal insulation structure of this invention, the average diameter of the fiber balls is between 3 and 10 millimeters, and the total weight of any ten fiber balls is between 0.01 and 0.08 grams.

[0009] Preferably, in the thermal insulation structure of this invention, the fiber balls are hollow and nest-like.

[0010] Preferably, in the thermal insulation structure of this invention, the total weight of the short fibers is between 10 wt% and 30 wt%, based on the weight of the composite fiber unit being 100 wt%.

[0011] Preferably, in the thermal insulation structure of this invention, the melting point of the short fiber is 0.4 to 0.9 times that of the melting point of the fiber ball.

[0012] Preferably, in the thermal insulation structure of this invention, the melting point of the short fiber is 0.4 to 0.7 times that of the melting point of the fiber ball.

[0013] Preferably, in the thermal insulation structure of this invention, the melting point of the short fiber is 0.48 to 0.68 times that of the melting point of the fiber ball.

[0014] Preferably, in the thermal insulation structure of this invention, the fiber balls are selected from synthetic fiber balls or down fiber balls.

[0015] Preferably, in the thermal insulation structure of this invention, the height of the composite fiber unit is between 5 and 100 mm, and the basis weight is between 40 and 2000 gsm.

[0016] Preferably, in the thermal insulation structure of this invention, at least a portion of the short fibers are fused with adjacent fiber balls, and at least a portion of the short fibers are fused with each other.

[0017] Preferably, in the thermal insulation structure of this utility model, the main unit has a metal layer, and the metal layer is located between the fiber substrate and the composite fiber unit.

[0018] Preferably, in the thermal insulation structure of this utility model, the main unit has two metal layers, and the two metal layers are respectively formed on two opposite surfaces of the fiber substrate.

[0019] The beneficial effect of this invention is that by fixing at least a portion of the fiber balls together with short fibers whose melting point is lower than that of the fiber balls, the composite fiber unit can present a fluffy air layer structure through the support of the fiber balls, thereby reducing heat transfer, and further improving the heat preservation effect by using at least one metal layer. Attached Figure Description

[0020] Figure 1 This is a side view illustrating an embodiment of the thermal insulation structure of this utility model. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] Before this utility model is described in detail, it should be noted that similar elements are represented by the same reference numerals in the following description.

[0023] The relevant technical content, features, and effects of this utility model will be clearly presented in the following detailed description of the embodiments with reference to the accompanying drawings. Furthermore, it should be noted that the accompanying drawings are only for illustrating the structural and / or positional relationships between components and are not related to the actual dimensions of each component.

[0024] See Figure 1 An embodiment of the thermal insulation structure of this utility model includes a main body unit 2 and a composite fiber unit 3 formed on the surface of the main body unit 2.

[0025] The main body unit 2 has a fiber substrate 21 and a metal layer 22 formed on one surface of the fiber substrate 21.

[0026] The fiber substrate 21 can be a woven or non-woven fabric of polyester or polyolefin. The polyester and the polyolefin can be polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT), polybutylene terephthalate (PBT), polylactic acid (PLA), polyethylene (PE), or polypropylene (PP). The metal layer 22 can be made of aluminum, copper, silver, zinc, lead, or nickel. The metal layer 22 can be formed on the surface of the fiber substrate 21 opposite to the surface of the composite fiber unit 3, or between the fiber substrate 21 and the composite fiber unit 3. The thickness of the metal layer 22 is between 10 and 100 nanometers.

[0027] In this embodiment, the fiber substrate 21 is a polyester nonwoven fabric, and the main unit 2 has a metal layer 22 made of aluminum with a thickness of 30 nanometers, with the metal layer 22 positioned between the fiber substrate 21 and the composite fiber unit 3, but this is not a limitation. By positioning the metal layer 22 between the fiber substrate 21 and the composite fiber unit 3, the metal layer 22 and the fiber ball 31 can be in direct contact, which can reduce heat loss and thus achieve a better temperature retention effect.

[0028] In addition, in some embodiments, the main body unit 2 may also have two metal layers 22. The metal layers 22 may be located on the surface of the fiber substrate 21 opposite to the composite fiber unit 3, and between the fiber substrate 21 and the composite fiber unit 3, respectively. By forming metal layers 22 on both opposite surfaces of the fiber substrate 21, heat loss can be further reduced, thereby achieving a better temperature holding effect.

[0029] The composite fiber unit 3 is located on one surface of the main body unit 2, and includes several fiber balls 31 and several short fibers 32 dispersed among the fiber balls 31.

[0030] The fiber ball 31 is hollow and nest-like; more specifically, it is a loose cotton ball composed of fiber filaments. The short fiber 32 is made of a polymer material with a melting point lower than that of the fiber ball 31. The length of the short fiber 32 is not greater than the diameter of the fiber ball 31. At least a portion of the short fiber 32 is fused to adjacent fiber balls 31, and at least a portion of the short fiber 32 is fused to each other.

[0031] In some embodiments, the fiber ball 31 may be selected from synthetic fiber balls or down fiber balls.

[0032] Specifically, when the fiber ball 31 is selected from synthetic fiber balls, the constituent materials of the fiber ball 31 and the short fiber 32 are respectively selected from at least one of polyester and polyolefin. The polyester and the polyolefin may be polyethylene terephthalate (PET), polypropylene terephthalate (PTT), polybutylene terephthalate (PBT), polylactic acid (PLA), polyethylene (PE), polypropylene (PP), or ethylene-propylene copolymer.

[0033] In some embodiments, the height of the composite fiber unit 3 is between 5 and 100 mm, and the basis weight is between 40 and 2000 gsm.

[0034] In other embodiments, the diameter of the fiber ball 31 is between 3 and 10 mm, the total weight of the short fibers 32 is between 10 wt% and 30 wt% based on the weight of the composite fiber unit 3 as 100 wt%, and the total weight of any ten fiber balls 31 is between 0.01 and 0.08 grams.

[0035] In this embodiment, the insulation structure has a height of 23.6 mm, a weight of 100 gsm, and an average diameter of 7.5 mm for the fiber balls 31. The fiber balls 31 are made of synthetic fibers, but this is not a limitation.

[0036] The aforementioned embodiment involves depositing aluminum onto the surface of the fiber substrate 21 via physical vapor deposition (PVD), with the following coating conditions: vacuum degree <10. -2 Under the condition of Pa, aluminum is heated to above 800°C, causing aluminum atoms to evaporate and move. The temperature inside the vacuum chamber is controlled to 40 to 100°C, thereby causing aluminum atoms to deposit on the surface of the fiber substrate 21 to form the metal layer 22. Then, the fiber balls 31 and the short fibers 32 are evenly distributed on the surface of the metal layer 22, and then heated to fuse some of the fiber balls 31 and the short fibers 32 to form the composite fiber unit 3, thus obtaining the thermal insulation structure.

[0037] It should be noted that, regardless of whether the composite fiber unit 3 is adjacent to the fiber substrate 21 or the metal layer 22 of the main body unit 2, the entire composite fiber unit 3 is connected to the adjacent fiber substrate 21 or the metal layer 22 through the melting of some of the short fibers 32 of the composite fiber unit 3 and the electrostatic adhesion of the short fibers 32 and the fiber balls 31 in contact with the surface of the main body unit 2. Specifically, when the composite fiber unit 3 is electrostatically attached to the surface of the main body unit 2, under standard conditions of (23.0±2.0)℃ and (50±10)% relative humidity, its electrostatic force reaches 2 to 3 kV. This indicates that the composite fiber unit 3 can be tightly and firmly attached to the corresponding surface through electrostatic adhesion.

[0038] By controlling the length of the short fiber 32, the contact opportunities between the short fiber 32 and the fiber ball 31 can be increased. In addition, by limiting the melting point of the short fiber 32, when it is heated and melted to join with part of the fiber ball 31, its lower melting temperature can prevent the fiber ball 31 from melting together during the joining process and causing agglomeration. This allows the composite fiber unit 3 to present a fluffy air layer structure supported by the fiber ball 31.

[0039] In some embodiments, the melting point of the short fiber 32 is 0.4 to 0.9 times that of the melting point of the fiber ball 31.

[0040] Preferably, the melting point of the short fiber 32 is 0.4 to 0.7 times that of the fiber ball 31.

[0041] Preferably, the melting point of the short fiber 32 is 0.48 to 0.68 times that of the fiber ball 31.

[0042] Specifically, the melting point of the fiber ball 31 is 250°C, and the melting point of the short fiber 32 is between 120°C and 170°C.

[0043] More specifically, the melting point of the fiber ball 31 is 250°C, and the melting point of the short fiber 32 is half the melting point of the fiber ball 31 (125°C).

[0044] Referring to Tables 1 and 2 below, Table 1 shows the test results of the clothing thermal resistance performance (CLO) of Specific Example 1 and Comparative Example 1 of the thermal insulation structure of this utility model. Specific Example 1 has the same structure as the embodiment described above, and the fiber balls 31 of the composite fiber unit 3 are synthetic fiber balls. Comparative Example 1 has a structure largely the same as Specific Example 1, except that Comparative Example 1 does not have the metal layer 22.

[0045] Table 2 shows the test results of the thermal resistance performance of clothing in Specific Example 2 and Comparative Example 2 of the thermal insulation structure of this utility model. Specific Example 2 and Comparative Example 2 are structurally similar to Specific Example 1 and Comparative Example 1 of this utility model, except that the fiber ball 31 of the composite fiber unit 3 in Specific Example 2 and Comparative Example 2 is a down fiber ball (model: WDD90 / 10, Helong Wool Factory).

[0046] Table 1

[0047]

[0048]

[0049] Table 2

[0050]

[0051] As shown in Tables 1 and 2, Examples 1 and 2 of this invention, due to the additional metal layer 22, which effectively blocks radiant energy, achieve better warmth retention compared to Comparative Examples 1 and 2. Furthermore, the results in Tables 1 and 2 indicate that when the fiber ball 31 is composed of synthetic fiber balls and down fiber balls and is combined with the metal layer 22, it also achieves good warmth retention.

[0052] In summary, the thermal insulation structure of this utility model is designed to form a composite fiber unit 3 with a fluffy air layer structure by using the relationship between the length and melting point of the short fiber 32 and the fiber ball 31. Furthermore, a metal layer 22 is formed on at least one surface of the fiber substrate 21. This can more effectively reduce the heat exchange between the main unit 2 and the composite fiber unit 3 through thermal radiation, thus achieving a good thermal insulation effect. Therefore, it can indeed achieve the purpose of this utility model.

[0053] However, the above description is merely an embodiment of this utility model and should not be construed as limiting the scope of this utility model. Any simple equivalent changes and modifications made in accordance with the claims and description of this utility model shall still fall within the scope of this utility model.

Claims

1. A thermal insulation structure, characterized in that, The thermal insulation structure includes: The main body unit has a fiber substrate and at least one metal layer formed on one surface of the fiber substrate; and A composite fiber unit, located on the surface of the main unit, includes several fiber balls and several short fibers dispersed among the fiber balls. The length of the short fibers is not greater than the diameter of the fiber balls, and the melting point of the short fibers is lower than that of the fiber balls.

2. The thermal insulation structure according to claim 1, characterized in that, The average diameter of the fiber balls is between 3 and 10 millimeters, and the total weight of any ten fiber balls is between 0.01 and 0.08 grams.

3. The thermal insulation structure according to claim 1, characterized in that, The fiber balls are hollow and nest-like.

4. The thermal insulation structure according to claim 1, characterized in that, With the weight of the composite fiber unit being 100 wt%, the total weight of the short fibers is between 10 wt% and 30 wt%.

5. The thermal insulation structure according to claim 1, characterized in that, The melting point of the short fiber is 0.4 to 0.9 times that of the fiber ball.

6. The thermal insulation structure according to claim 5, characterized in that, The melting point of the short fiber is 0.4 to 0.7 times that of the fiber ball.

7. The thermal insulation structure according to claim 6, characterized in that, The melting point of the short fiber is 0.48 to 0.68 times that of the fiber ball.

8. The thermal insulation structure according to claim 1, characterized in that, The fiber balls are selected from synthetic fiber balls or down fiber balls.

9. The thermal insulation structure according to claim 1, characterized in that, The height of the composite fiber unit is between 5 and 100 mm, and the basis weight is between 40 and 2000 gsm.

10. The thermal insulation structure according to claim 1, characterized in that, At least a portion of the short fibers are fused to the adjacent fiber balls, and at least a portion of the short fibers are fused to each other.

11. The thermal insulation structure according to claim 1, characterized in that, The main unit has a metal layer, and the metal layer is located between the fiber substrate and the composite fiber unit.

12. The thermal insulation structure according to claim 1, characterized in that, The main body unit has two metal layers, and the two metal layers are respectively formed on two opposite surfaces of the fiber substrate.

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