A foamed microcellular thermal fiber

Abstract

The utility model provides a kind of foamed microporous warm-keeping fiber, including center fiber, outer fiber, the periphery of the center fiber is wrapped and packed with outer fiber, the inside of the center fiber is equipped with a hollow layer;Fill fiber is further provided between the center fiber, outer fiber, and the fill fiber is knitted and wrapped in the outer surface of center fiber;The fill fiber is specifically acrylate-based fiber.The utility model has the advantages that: when weaving, these coiled fibers are wrapped around the center fiber with slightly relaxed tension, forming a "spaced weaving" geometric arrangement (i.e., the fibers are not tightly attached, but have a small gap).It is convenient for the overall foaming and expansion of the fiber, ensures the foaming and expansion space, and avoids the collapse of the fiber structure.The fill fiber is made of acrylate-based material, which is a thermal expansion material, and naturally has thermal expansion microspheres.In heat setting, the microspheres expand, creating micron-sized bubbles in the fiber interior and gaps, effectively improving the warmth retention performance of the fiber.

Description

Technical Field

[0001] This utility model relates to the field of thermal insulation fiber technology, and in particular to a foamed microporous thermal insulation fiber. Background Technology

[0002] Traditional insulation materials primarily rely on the stagnant air layer trapped within fibers or fabrics to reduce heat conduction, thereby achieving a heat-insulating effect. Examples include down, wool, and various synthetic fiber fillings. However, these materials still have significant limitations: down is susceptible to moisture and its processing is complex; wool is heavy and has limited breathability; and ordinary synthetic fibers often have insufficient stagnant air retention due to their high thermal conductivity and dense fiber structure, resulting in low insulation efficiency.

[0003] To further improve the thermal insulation performance of fibers, the industry has gradually developed hollow fiber and foamed microporous fiber technologies. Hollow fibers store air through their internal hollow structure, forming an insulating layer that effectively reduces heat conduction. For example, polyester (PET) hollow fibers are widely used in thermal insulation fillings. However, the hollow structure of these fibers is often easily collapsed during textile processing, resulting in a reduction in the air layer and a decrease in thermal insulation performance. In addition, a single hollow structure is also difficult to achieve a superior thermal insulation effect.

[0004] On the other hand, foamed microporous fibers further increase the static air content by introducing micron-sized air bubbles inside or between the fibers, significantly enhancing their warmth retention. Existing technologies include methods for producing heat-generating fibers by spinning a mixture of thermally expanding microspheres (such as acrylate-based microspheres), which can form micropores inside the fiber after heat treatment. However, most of these fibers suffer from uneven foaming, poor microsphere distribution consistency, insufficient fiber structural strength, and micropore collapse after repeated use or washing, affecting their service life and warmth retention durability. Furthermore, most existing foamed fibers still exist in a single fiber form, lacking multi-level structural design for fiber assemblies, making it difficult to synergistically optimize bulkiness, elasticity, and thermal resistance.

[0005] Therefore, there is an urgent need to develop a new type of foamed microporous thermal insulation fiber that can achieve a more stable and uniform microporous foam structure while maintaining the mechanical properties of the fiber, effectively improving thermal insulation efficiency and extending service life. Utility Model Content

[0006] The purpose of this invention is to at least solve one of the aforementioned technical defects.

[0007] Therefore, one objective of this utility model is to propose a foamed microporous thermal insulation fiber to solve the problems mentioned in the background art and overcome the shortcomings of the existing technology.

[0008] To achieve the above objectives, one embodiment of the present invention provides a foamed microporous thermal insulation fiber, comprising a central fiber and an outer fiber, wherein the outer fiber is wrapped around the central fiber, and a hollow layer is formed inside the central fiber; A filling fiber is also provided between the central fiber and the outer fiber, and the filling fiber is woven and wrapped around the outer surface of the central fiber. The filling fiber is specifically an acrylate-based fiber.

[0009] Preferably, in any of the above embodiments, the diameter of the central fiber is larger than the diameter of the outer fiber, and the material of the central fiber is PET.

[0010] The above technical solution is adopted: the central fiber is designed in a tubular shape, the hollow part can expand during the later foaming process, and the hollow interior without air is also conducive to heat insulation.

[0011] Preferably, in any of the above embodiments, the diameter of the outer fiber is larger than the diameter of the filling fiber, and the material of the outer fiber is PET.

[0012] This fiber consists of a central fiber from the inside out, an outer fiber wrapped around the central fiber, and a filling fiber between the central fiber and the outer fiber. The filling fiber is woven and wrapped around the outer surface of the central fiber.

[0013] Preferably, in any of the above embodiments, the outer fiber is mechanically crimped and hot-pressed into a regular wavy shape before weaving. The surrounding six fibers are also mechanically crimped (e.g., hot-pressed or gear crimping machine) into a regular wavy shape before weaving. During weaving, these crimped fibers wrap around the central fiber with slightly relaxed tension, forming a "spaced-weave" geometric arrangement (i.e., the fibers are not tightly bonded, but leave tiny gaps). This facilitates the overall foaming and expansion of the fiber.

[0014] Preferably, in any of the above embodiments, at least six filler fibers are wound circumferentially around the axis of the central fiber, and micron-sized bubbles are generated inside and between the filler fibers during heat setting. The filler fibers are made of acrylic ester-based materials, which are thermally expandable materials, and naturally contain thermally expandable microspheres. During heat setting, the microspheres expand, generating micron-sized bubbles inside and between the fibers.

[0015] Fiber composition: Core fiber: PET tubular structure, with an internal hollow layer running axially through it. The hollow layer is in a vacuum or low-pressure air state when not foamed.

[0016] Filler fiber: at least one acrylic fiber, woven in a spiral around the outer surface of the central fiber.

[0017] Outer fiber: PET fiber, which is mechanically crimped and hot-pressed into a regular wavy shape, and then wrapped with low-tension spiral to form a non-tightly bonded spaced woven structure.

[0018] Compared with the prior art, the advantages and beneficial effects of this utility model are as follows: This foamed microporous insulating fiber features a tubular central fiber with a hollow core that expands during the foaming process. The air-free interior also contributes to its thermal insulation properties. The surrounding six fibers are mechanically crimped into a regular wavy shape before weaving (e.g., by hot pressing or a gear crimping machine). During weaving, these crimped fibers wrap around the central fiber with slightly relaxed tension, forming a "spaced-weave" geometric arrangement (i.e., the fibers are not tightly bonded but have tiny gaps). This facilitates overall fiber foaming and expansion, ensuring sufficient space for expansion and preventing fiber structure collapse. The filling fiber is an acrylic-based material, a thermally expanding material containing naturally occurring thermally expanding microspheres. During heat setting, these microspheres expand, creating micron-sized bubbles within the fiber and its gaps, effectively enhancing the fiber's thermal insulation performance.

[0019] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a first-view structural schematic diagram of the present invention; Figure 2 This is a structural schematic diagram of the present invention from a second perspective; Figure 3 This is a schematic diagram of the layer structure of this utility model.

[0021] In the diagram: 1-Central fiber, 2-Outer fiber, 3-Hollow layer, 4-Filling fiber. Detailed Implementation

[0022] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0023] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0024] like Figure 1-3 As shown, this foamed microporous thermal insulation fiber includes a central fiber 1 and an outer fiber 2. The outer fiber 2 is wrapped around the central fiber 1, and a hollow layer 3 is formed inside the central fiber 1. A filling fiber 4 is also provided between the central fiber 1 and the outer fiber 2, and the filling fiber 4 is woven and wrapped around the outer surface of the central fiber 1; Filler fiber 4 is specifically an acrylate-based fiber.

[0025] Example 1: The diameter of the central fiber 1 is larger than the diameter of the outer fiber 2, and the material of the central fiber 1 is PET. The diameter of the outer fiber 2 is larger than the diameter of the filler fiber 4, and the material of the outer fiber 2 is PET. This fiber consists of a central fiber 1 from the inside out, with outer fibers 2 wrapped around the central fiber 1. Filler fibers 4 are also placed between the central fiber 1 and the outer fibers 2, and are woven around the outer surface of the central fiber 1. The outer fibers 2 are mechanically crimped and hot-pressed into a regular wavy shape before weaving. At least six filler fibers 4 are wound circumferentially around the axis of the central fiber 1. During heat setting, micron-sized bubbles are generated inside and between the filler fibers 4. The filler fibers 4 are made of acrylic ester-based material, a thermally expanding material, and naturally contain thermally expanding microspheres. During heat setting, the microspheres expand, generating micron-sized bubbles inside and between the fibers.

[0026] Example 2: The central fiber 1 has a tubular design, and the hollow part can expand during the subsequent foaming process. The air-free interior also facilitates thermal insulation. Before weaving, the surrounding six fibers are mechanically crimped into a regular wavy shape using a process such as hot pressing or a gear crimping machine. During weaving, these crimped fibers wrap around the central fiber with slightly relaxed tension, forming a "spaced-weave" geometric arrangement (i.e., the fibers are not tightly bonded, but leave tiny gaps). This facilitates the overall foaming and expansion of the fiber.

[0027] Fiber composition: Central fiber 1: PET tubular structure, with hollow layer 3 running through it axially. Hollow layer 3 is in a vacuum or low-pressure air state when not foamed.

[0028] Filler fiber 4: at least 6 acrylic-based fibers, woven in a spiral manner around the outer surface of the central fiber 1.

[0029] Outer fiber 2: PET fiber, which is mechanically crimped and hot-pressed to form a regular wavy shape, and then wrapped with low-tension spiral to fill fiber 4, forming a non-tightly bonded spaced woven structure.

[0030] The working principle of this utility model is as follows: Pre-treatment stage: Outer fiber 2 is pressed into a wave shape by a gear crimping machine, and standard tension is maintained during weaving to form micro gaps between fibers.

[0031] Heat treatment stage (temperature 120~150℃): The thermally expanded microspheres in the filling fiber 4 decompose, generating closed bubbles (micropores A) inside the fiber. The filling fiber 4 softens and expands when heated, bonding with adjacent fibers and forming interconnected bubbles (micropores B) in the gaps. Shaping stage: The hollow layer 3 of the central fiber 1 expands when heated, pushing the filling fiber 4 outward, forcing the crests / troughs of the outer fiber 2 to deform, forming irregular air cavities (micropores C) in the gaps between the outer fibers. Thermal insulation mechanism: Micropores A / B / C form a gradient-sized air layer network, effectively blocking heat conduction; the vacuum / low-pressure state of the hollow layer 3 significantly reduces gas convection heat dissipation.

[0032] Compared with the prior art, the present invention has the following advantages: This foamed microporous insulating fiber features a tubular central fiber (1) with a hollow core that expands during the foaming process. The air-free interior also contributes to its thermal insulation properties. The surrounding six fibers are mechanically crimped (e.g., by hot pressing or a gear crimping machine) into a regular wavy shape before weaving. During weaving, these crimped fibers wrap around the central fiber with slightly relaxed tension, forming a "spaced-weave" geometric arrangement (i.e., the fibers are not tightly bonded but have tiny gaps). This facilitates overall fiber foaming and expansion, ensuring sufficient space for expansion and preventing fiber structure collapse. The filling fiber (4) is an acrylic-based material, a thermally expanding material containing naturally occurring thermally expanding microspheres. During heat setting, these microspheres expand, creating micron-sized bubbles within the fiber and its gaps, effectively enhancing the fiber's thermal insulation performance.

Claims

1. A foamed microporous thermal insulation fiber, characterized in that, It includes a central fiber (1) and an outer fiber (2), the central fiber (1) is surrounded by the outer fiber (2), and a hollow layer (3) is formed inside the central fiber (1). A filling fiber (4) is also provided between the central fiber (1) and the outer fiber (2), and the filling fiber (4) is woven and wrapped around the outer surface of the central fiber (1); The filling fiber (4) is specifically an acrylate-based fiber.

2. The foamed microporous thermal insulation fiber as described in claim 1, characterized in that: The diameter of the central fiber (1) is larger than the diameter of the outer fiber (2), and the material of the central fiber (1) is PET.

3. The foamed microporous thermal insulation fiber as described in claim 2, characterized in that: The diameter of the outer fiber (2) is larger than the diameter of the filling fiber (4), and the material of the outer fiber (2) is PET.

4. The foamed microporous thermal insulation fiber as described in claim 3, characterized in that: The outer fiber (2) is mechanically crimped and hot-pressed into a regular wavy shape before weaving.

5. The foamed microporous thermal insulation fiber as described in claim 4, characterized in that: The filling fiber (4) has at least six fibers circumferentially wound around the axis of the central fiber (1), and micron-sized bubbles are generated inside and between the fibers during heat setting.

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