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DE-102019130667-B4 - fire blanket

DE102019130667B4DE 102019130667 B4DE102019130667 B4DE 102019130667B4DE-102019130667-B4

Abstract

Fire blanket (1) with a multi-layered structure, wherein the fire blanket (1) has a three-layered structure (10, 11, 12) with a first and third outer layer (10, 12) made of a glass fabric and an intermediate second layer (11) comprising bentonite, characterized in that the fire blanket (1) is quilted with quilted seams (2) to form chambers (3) and the quilted seams (2) consist of a yarn with a steel core covered with cotton.

Inventors

  • Jörg Haertle

Assignees

  • Jörg Haertle

Dates

Publication Date
20260513
Application Date
20191113

Claims (5)

  1. Fire blanket (1) with a multi-layered structure, wherein the fire blanket (1) has a three-layered structure (10, 11, 12) with a first and third outer layer (10, 12) made of a glass fabric and an intermediate second layer (11) comprising bentonite, characterized in that the fire blanket (1) is quilted with quilted seams (2) to form chambers (3) and the quilted seams (2) consist of a yarn with a steel core covered with cotton.
  2. fire blanket (1) according to Claim 1 , characterized in that the bentonite has a grain size of 0.5 to 2 mm.
  3. fire blanket (1) according to Claim 1 , characterized in that the fire blanket (1) is equipped with handling devices, in particular edge loops and/or straps.
  4. Fire blanket (1) according to one of the Claims 1 until 3 , characterized in that the fire blanket (1) can be folded into a bag (13) with releasable fastening means.
  5. fire blanket (1) according to Claim 4 , characterized in that the releasable fastening means are designed as hook and loop fasteners (4, 5, 6, 7, 8, 9) attached to the edge of the fire blanket (1).

Description

The invention relates to a fire blanket with a multi-layered structure, wherein the fire blanket has a three-layered structure with a first and third outer layer made of a glass fabric and a second layer arranged in between, comprising bentonite. A fire blanket, also called a fire extinguishing blanket or fire protection blanket, can be used to cover or smother existing open fires that produce gas, smoke, and flames. The fire blanket prevents the flames from spreading to surrounding objects. It also significantly reduces the oxygen supply to the fire, thus containing or even extinguishing it through oxygen deprivation. These fire blankets are made of materials such as glass, Nomex, or aramid fabrics and are available in various sizes, ranging from those suitable for use in private homes to those large enough to cover an entire vehicle. Furthermore, there are fire blankets specifically designed to contain fires or spontaneous combustion of lithium-ion batteries. When a lithium-ion battery is damaged, the chemical composition of its components leads to the release of gaseous hydrofluoric acid (HF) and significant thermal energy. Moreover, a damaged lithium-ion battery undergoes thermal runaway without an external oxygen supply, meaning that simply cutting off the oxygen supply is ineffective. For example, ADL Insulflex, Cobourg, Ontario, Canada, offers fire blankets specifically designed for laptops, smartphones, electric vehicles, and other devices with lithium-ion batteries. These blankets consist of fiberglass fabric and several layers of aluminized Mylar. LithiumSafe, Oosterhout, Netherlands, offers bags made of a multi-layered material, into which, for example, a laptop whose lithium-ion battery is beginning to burn out can be placed. The DE 40 41 470 A1 This describes a fire-resistant fabric consisting of two textile layers, needled or sewn together, containing a granular intumescent material. The textile layers may contain glass fibers, and the entire fabric can serve as a fire blanket. The DE10 2006 062 248 A1 It reveals a polymer film for surface coating. Rigid components in the aerospace industry are coated in this process. DE 60 2005 003 667 T2 shows a multi-layered mat for use as protection for an environmental protection element. The EP 2 501 780 B1 shows a surface coating that swells in case of fire and serves as a "seal" for example on doors, pipes, wall penetrations and the like. Furthermore, US patent 2015/0136431A1 discloses a fire blanket with a three-layer structure, comprising a first and third outer layer of glass fabric and an intermediate second layer containing bentonite in the form of fine granules. Furthermore, from the DE 198 27 909 A1 Sealing mats are known in which a bentonite layer is incorporated between two fully needled layers. The invention is based on the objective of providing a fire blanket that is easy to manufacture, versatile in its use, and effectively protects the surroundings from the consequences of a lithium-ion battery burning out. According to the invention, these problems are solved by quilting the fire blanket with quilted seams to form chambers, and the quilted seams consist of a yarn with a steel core that is covered with cotton. The fire blanket has a three-layered structure. The two outer layers are each made of fire-resistant glass fabric, which is fire-resistant according to the industry standard EN 13501-1, or exhibits corresponding burning behavior. This glass fabric can also be described as glass filament fabric. Bentonite, for example in the form of fine granules, is arranged or embedded between the two outer fabric layers as a middle layer. Bentonite is a rock consisting of 60 to 80% montmorillonite and also includes quartz, mica, feldspar, pyrite, and calcite. This design of the fire blanket provides it with sufficient fire resistance, meaning it can withstand the high temperatures generated in fires for a sufficient period without significant damage, for example, to extinguish a conventional fire by cutting off the oxygen supply. Furthermore, the Fire blankets, due to their outer fabric layers and the bentonite layer between them, are also permeable to a certain degree of gas. This allows the gas produced when a lithium-ion battery burns to dissipate through the blanket. The bentonite incorporated into the blanket acts as a filter, filtering out or adsorbing the hydrofluoric acid produced during combustion. This effectively prevents gas poisoning of bystanders while simultaneously protecting them from open flames. In addition to hydrofluoric acid (HF), toxic dusts containing heavy metals, graphite, or nanocarbon compounds, as well as carcinogenic electrolyte vapors, are also filtered. Furthermore, the gas permeability of the fire blanket prevents the blanket from being lifted away from the burning object it is covering due to the gas pressure generated during a fire, i.e., from being thrown off, or from being lifted off the surface if there is no