WO2022164112A1

WO2022164112A1 - Waterproof vent sheet

Info

Publication number: WO2022164112A1
Application number: PCT/KR2022/000949
Authority: WO
Inventors: 신강식; 박경택
Original assignee: 주식회사 아모그린텍
Priority date: 2021-01-26
Filing date: 2022-01-19
Publication date: 2022-08-04
Also published as: KR20220107818A

Abstract

A waterproof vent sheet is disclosed. The waterproof vent sheet comprises: a waterproof vent layer having a waterproof function and configured to allow air to pass therethrough; a first adhesive layer attached on the lower surface of the waterproof vent layer; and a second adhesive layer attached on the upper surface thereof opposite to the lower surface of the waterproof vent layer, wherein the first adhesive layer and the second adhesive layer are formed in a ring shape having an opening, and the inner diameter of the first adhesive layer is greater than the inner diameter of the second adhesive layer.

Description

waterproof breathable sheet

The present invention relates to a waterproof ventilation sheet that prevents the inflow of foreign substances such as moisture from the outside and allows air to pass therethrough.

Recently, the use of mobile electronic devices such as smartphones or smart watches is increasing day by day. Since these mobile electronic devices are portable and used in daily life, they are required to have a waterproof function.

The mobile electronic device includes elements such as a speaker, a microphone, or a pressure sensor, and a hole (eg, a ventilation hole) for passing air must be formed in a portion where the element is disposed. However, there is a problem that water or dust may penetrate into the interior of the mobile electronic device through the ventilation hole. Accordingly, the ventilation hole is provided with a waterproof ventilation sheet that allows air to pass through, but blocks water or dust.

Since the waterproof ventilation sheet is directly related to the waterproof performance of mobile electronic devices, the durability of the waterproof ventilation sheet is important.

1 shows a conventional waterproof ventilation sheet. Referring to Figure 1, the conventional waterproof ventilation sheet 20 is attached to the inside of the electronic device, while preventing liquid or foreign substances flowing from the outside of the electronic device from flowing into the inside of the electronic device, the inside and outside of the electronic device It can serve to pass air between them.

On the other hand, pressure may be applied to the conventional waterproof ventilation sheet 20 . For example, when the support layer 27 is adhered to the waterproof ventilation layer 21 through the second adhesive layer 25 (ie, when the waterproof ventilation sheet 20 is manufactured) or when the waterproof ventilation sheet 20 is applied to the electronic device 10 . When attached to (that is, when the waterproof ventilation sheet 20 is used), pressure may be applied to the waterproof ventilation sheet 20 through the support layer 27 . By the pressure applied to the waterproof ventilation sheet 20, the portion (A portion) of the waterproof ventilation layer 21 in contact with the edge of the cross-section of the first adhesive layer 23 may be damaged due to the pressure. For example, when the waterproof ventilation layer 21 is stretched according to external pressure, a large pressure by the edge of the cross-section of the first adhesive layer 23 is applied to the waterproof ventilation layer 21, and accordingly, the waterproof ventilation layer 21 ) part A may be damaged. In addition, for example, depending on the pressure applied to the waterproof ventilation sheet 20, the support layer 27 is stretched in the direction of the ventilation hole, and the extended support layer 27 and the waterproof ventilation layer 21 are in contact with each other (part B) is damaged. can

Since the above pressure is indispensable in the process of manufacturing or using the waterproof ventilation sheet 20, it is necessary to improve the problem of damage to the waterproof ventilation sheet 20 due to such pressure.

It is an object of the present invention to provide a waterproof breathable sheet having improved durability against external pressure, and reduced possibility of damage during manufacturing and use.

An object of the present invention is to arrange a second adhesive layer including a reinforcing part disposed to protrude further into the inside of the waterproof breathable layer than the first adhesive layer disposed on the lower surface of the waterproof breathable layer on the upper surface of the waterproof breathable layer, so that the external applied to the waterproof breathable layer An object of the present invention is to provide a waterproof ventilation sheet capable of dispersing pressure using a reinforcing part.

An object of the present invention is to determine the thickness of the support layer disposed on the waterproof breathable layer based on the thickness of the first adhesive layer disposed on the lower surface of the waterproof breathable layer, thereby reducing the pressure applied to the waterproof breathable layer by the support layer. It is to provide a ventilation sheet.

The waterproof breathable sheet according to embodiments of the present invention has a waterproof function and is attached to the upper surface opposite to the lower surface of the waterproof breathable layer, the first adhesive layer attached to the lower surface of the waterproof breathable layer, and the waterproof breathable layer and a second adhesive layer to be used, the first adhesive layer and the second adhesive layer are formed in a ring shape including an opening, and the inner diameter of the first adhesive layer is greater than the inner diameter of the second adhesive layer.

According to the waterproof ventilation sheet according to the embodiments of the present invention, by dispersing the external pressure applied to the waterproof ventilation layer by using the reinforcement part of the second adhesive layer, the durability of the waterproof ventilation layer to the external pressure is improved, and thus waterproof ventilation There is an effect that the breakage of the layer can be prevented.

According to the waterproof ventilation sheet according to embodiments of the present invention, by determining the thickness of the support layer based on the thickness of the first adhesive layer, the pressure applied to the waterproof ventilation layer by the support layer can be reduced, and accordingly, the It has the effect of preventing breakage.

1 shows a conventional waterproof ventilation sheet.

Figure 2 shows a waterproof breathable sheet according to embodiments of the present invention.

3 shows a case in which pressure is applied to the waterproof ventilation sheet according to embodiments of the present invention.

4 shows a waterproof ventilation sheet according to embodiments of the present invention.

In order to clearly describe the present invention, parts irrelevant to the description are omitted, and the same reference numerals are assigned to the same or similar elements throughout the specification.

Although not defined otherwise, all terms including technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention belongs. Commonly used terms defined in the dictionary are additionally interpreted as having a meaning consistent with the related technical literature and the presently disclosed content, and unless defined, are not interpreted in an ideal or very formal meaning.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those of ordinary skill in the art can easily implement them. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein.

Figure 2 shows a waterproof breathable sheet according to embodiments of the present invention. Hereinafter, the waterproof ventilation sheet shown in the drawings of the present specification is a form shown for explanation, and the dimensions of each configuration of the waterproof ventilation sheet according to embodiments of the present invention are not limited by the scale shown in the drawings .

Referring to FIG. 2 , the waterproof ventilation sheet 200 has a waterproof or dustproof function, and is attached to the first surface of the waterproof ventilation layer 210 and the waterproof ventilation layer 210 through which air passes through the ventilation hole of the electronic device. A support layer attached to the second adhesive layer 230 and the second adhesive layer 230 attached to the second surface positioned opposite to the first surface of the first adhesive layer 220 and the waterproof breathable layer 210 configured to be attached to the (240). According to this structure, the waterproof ventilation sheet 200 may allow air to flow in and out while preventing liquid or foreign substances flowing from the outside of the electronic device from flowing into the electronic device.

The waterproof breathable layer 210 may be formed of a thin film having a predetermined shape. According to embodiments, the waterproof ventilation layer 210 may be a thin film having various shapes, such as a circle, an ellipse, a polygon, etc., depending on the shape of the ventilation hole of the electronic device.

The waterproof breathable layer 210 may be a thin film having a thickness of about 5 μm to 50 μm depending on the waterproof and ventilation performance required by the applied device, but is not limited thereto. 210) may be formed in consideration of the thickness of the applied electronic device.

The waterproof breathable layer 210 may include a porous membrane to provide waterproof and breathable performance. In some embodiments, the waterproof breathable layer 210 may be made of a polymer material. For example, the waterproof breathable layer 210 may be formed by electrospinning a polymer material to form a polymer material layer having a web structure.

In this case, the polymer material is polyamide, polyimide, polyamideimide, poly(meta-phenylene isophthalamide), polysulfone, polyetherketone, polyetherimide, polyethylene terephthalate, polytrimethylene terephthalate, polyethylene Aromatic polyesters such as naphthalates, polyphosphazenes such as polytetrafluoroethylene, polydiphenoxyphosphazenes, poly{bis[2-(2-methoxyethoxy)phosphazenes]}, polyurethanes and polyethers It may include a polyurethane copolymer including urethane, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, and the like. Polyvinylidene fluoride (PVDF), poly (vinylidene fluoride-co-hexafluoropropylene), perfluoropolymer, polyvinyl chloride or polyvinylidene chloride and copolymers thereof and polyethylene glycol di Polyethylene glycol derivatives including alkyl ethers and polyethylene glycol dialkyl esters, poly(oxymethylene-oligo-oxyethylene), polyoxides including polyethylene oxide and polypropylene oxide, polyvinyl acetate, poly(vinylpyrrolidone- vinyl acetate), polystyrene and polystyrene acrylonitrile copolymer, polyacrylonitrile, polyacrylonitrile copolymer including polyacrylonitrile methyl methacrylate copolymer, polymethyl methacrylate, polymethyl methacrylate copolymer coalescing and mixtures thereof.

The first adhesive layer 220 is formed of a thin film having a predetermined shape having an opening inside (or in the center). For example, the first adhesive layer 220 is formed of a thin film having various shapes, such as circular, oval, polygonal, etc. according to the shape of the waterproof breathable layer 210 . In this case, the first adhesive layer 220 may include an opening for ventilation. For example, the first adhesive layer 220 may have a ring shape having an opening in the center, but embodiments of the present invention are not limited thereto.

The first adhesive layer 220 may be adhered to the first surface (eg, the lower surface) of the waterproof breathable layer 210 . According to embodiments, a first surface (eg, a lower surface) of the first adhesive layer 220 may be attached to the electronic device 110 , and a second surface (eg, a second surface opposite to the first surface of the first adhesive layer 220 ) , upper surface) may be adhered to the first surface (eg, lower surface) of the waterproof breathable layer 210 .

In some embodiments, the first adhesive layer 220 may be attached to a region in which an acoustic hole formed in the electronic device 110 is formed.

In some embodiments, the first adhesive layer 220 may be a substrate-type adhesive layer in which an adhesive is applied to both surfaces of a substrate such as a film. For example, the first adhesive layer 220 may be configured by bonding a thin film having an adhesive surface formed on a cross-section and a hot melt formed of a thermoplastic resin in a pellet or film shape. For example, the first adhesive layer 220 may be formed by laminating a hot melt and single-sided adhesive film.

In some embodiments, the first adhesive layer 220 may be an inorganic type adhesive layer that does not include a thin film. For example, the first adhesive layer 220 may be configured by applying an adhesive material in a solid state.

The second adhesive layer 230 is formed of a thin film having a predetermined shape having an opening therein (or in the center). For example, the second adhesive layer 230 is formed of a thin film having various shapes, such as circular, oval, polygonal, etc. according to the shape of the waterproof breathable layer 210 . In this case, the second adhesive layer 230 may include an opening for ventilation. For example, the second adhesive layer 230 may have a ring shape having an opening in the center, but embodiments of the present invention are not limited thereto.

The second adhesive layer 230 may be adhered to the second surface (eg, the upper surface) of the waterproof breathable layer 210 . According to embodiments, the first surface (eg, lower surface) of the second adhesive layer 230 may be adhered to the second surface (eg, upper surface) of the waterproof breathable layer 210 , and the second adhesive layer 230 may be A second surface (eg, an upper surface) opposite to the first surface may be attached to the support layer 240 .

In some embodiments, the second adhesive layer 230 may be a substrate-type adhesive layer in which an adhesive is applied to both surfaces of a substrate such as a film. For example, the second adhesive layer 230 may be formed by bonding a thin film having an adhesive surface formed on a cross-section and a hot melt formed of a thermoplastic resin in a pellet or film shape. For example, the second adhesive layer 230 may be formed by laminating a hot melt and single-sided adhesive film.

In some embodiments, the second adhesive layer 230 may be an inorganic type adhesive layer that does not include a thin film. For example, the second adhesive layer 230 may be configured by applying an adhesive material in a solid state.

The support layer 240 may be disposed on the second adhesive layer 230 . The support layer 240 may serve to support the structures of the waterproof breathable layer 210 and the adhesive layers 220 and 230 . As the support layer 240 is attached on the second adhesive layer 230 , the structures of the waterproof breathable layer 210 and the adhesive layers 220 and 230 may be stabilized.

The support layer 240 may be formed of a thin film having a predetermined shape. According to embodiments, the support layer 240 is formed of a thin film of various shapes, such as a circle, an oval, a square, a hexagon, etc. according to the ventilation hole of the electronic device 110 and the internal coupling structure. For example, the support layer 240 may be formed of a thin film having a thickness of 100 μm to 200 μm or less.

In some embodiments, the support layer 240 may be formed of a porous material having a plurality of pores. For example, the support layer 240 may have a plurality of pores, such as a nonwoven fabric made of a material such as polyethylene terephthalate (PET), polypropylene (PP), polyethylene (PE), or nylon. It may be composed of the formed porous material.

According to embodiments of the present invention, the second adhesive layer 230 may be disposed to protrude further inward of the waterproof and breathable layer 210 than the first adhesive layer 220 . Accordingly, the second adhesive layer 230 may be formed with a reinforcing portion 231 disposed to protrude further into the waterproof and breathable layer 210 than the first adhesive layer 220 . That is, the reinforcing part 231 may refer to parts of the second adhesive layer 230 that are disposed closer to the center C of the waterproof and breathable layer 210 than the first adhesive layer 220 .

In some embodiments, the reinforcing part 231 may be disposed on the waterproof ventilation layer 210 so as not to overlap the first adhesive layer 220 . For example, the reinforcing part 231 is disposed on a portion of the second surface (eg, the upper surface) opposite to the portion on which the first adhesive layer 220 is not disposed among the first surface (eg, the lower surface) of the waterproof ventilation layer 210 . can be

As will be described later, by the reinforcing part 231 formed in the second adhesive layer 230 , the pressure applied to the waterproof ventilation layer 210 through the support layer 240 is dispersed to the reinforcement part 231 , so that the waterproof ventilation layer The durability of the 210 is increased, and accordingly, there is an effect that the damage of the waterproof breathable layer 210 can be prevented.

According to embodiments, the first position P1 on the waterproof air-permeable layer 210 of the inner surface of the first adhesive layer 220 is the second on the waterproof air-permeable layer 210 of the inner surface of the second adhesive layer 230 . It may be more outward than the position P2. For example, the first position (P1) may be further away from the center (C) of the waterproof ventilation sheet 200 than the second position (P2). In this case, the reinforcing part 231 of the second adhesive layer 230 may be formed between the first position P1 and the second position P2 . For example, the width D of the reinforcing part 231 may be a distance between the first position P1 and the second position P2 .

In some embodiments, the first inner diameter (or inner width) R1 of the first adhesive layer 220 may be larger than the second inner diameter (or inner width) R2 of the second adhesive layer 230 . For example, the width D of the reinforcing portion 231 may be the difference between the first inner diameter R1 and the second inner diameter R2 , and the outer diameter of the reinforcing portion 231 is the first inner diameter of the first adhesive layer 220 . (R1), the inner diameter of the reinforcing part 231 may be the second inner diameter (R2) of the second adhesive layer (230).

In some embodiments, the first width W1 of the first adhesive layer 220 may be smaller than the second width W2 of the second adhesive layer 230 . In this case, the widths W1 and W2 of the adhesive layers 220 and 230 may mean widths of cross-sections of the adhesive layers 220 and 230 . For example, the width D of the reinforcing part 231 may be the difference between the first width W1 and the second width W2 .

Figure 3 shows a situation in which pressure is applied to the waterproof ventilation sheet according to embodiments of the present invention. Referring to FIG. 3 , pressure may be applied to the waterproof ventilation sheet 200 . For example, when the support layer 240 is attached to the second adhesive layer 230 or when the waterproof ventilation sheet 200 is attached to an electronic device, pressure may be applied to the waterproof ventilation sheet 200 through the support layer 240 . When pressure is applied to the waterproof ventilation sheet 200 , the pressure applied to the support layer 240 is transferred to the waterproof ventilation layer 210 through the second adhesive layer 230 .

Unlike the conventional waterproof ventilation sheet 20 , the waterproof ventilation sheet 200 according to embodiments of the present invention includes a reinforcing part 231 . At this time, the portion (A portion) of the waterproof air-permeable layer 210 in contact with the edge of the first adhesive layer 23 may not only be increased in strength by the reinforcing portion 231 , but also be waterproofed by the reinforcing portion 231 . The pressure applied to the ventilation layer 210 may be dispersed.

For example, in the case of the conventional waterproof ventilation sheet 20, when pressure is applied through the support layer 27, a large pressure is applied to the portion (part A) in contact with the edge of the first adhesive layer 23 of the waterproof ventilation layer 21. and may cause damage as a result. On the other hand, in the case of the waterproof breathable sheet 200 according to the embodiments of the present invention described in FIG. 3 , the reinforcement part ( 231) is formed, not only the strength of the A portion of the waterproof ventilation layer 210 is reinforced, but also the pressure applied to the portion is dispersed, thereby preventing the waterproof ventilation layer 210 from being damaged.

In addition, according to embodiments of the present invention, since the reinforcement part 231 is formed on the part (part A) in contact with the edge of the first adhesive layer 220 of the waterproof ventilation layer 210, even if part A is damaged The damaged part A is blocked by the reinforcing part 231 . Accordingly, even if water or foreign substances are introduced through the crack of the damaged part A, the introduced water or foreign substances are blocked by the reinforcing part 231 and can be introduced into the support layer 240 or the second adhesive layer 230 . none. Accordingly, there is an effect that the waterproof performance of the waterproof ventilation sheet 200 can be maintained.

4 shows a waterproof ventilation sheet according to embodiments of the present invention. Referring to FIG. 4 , in the waterproof breathable sheet 200 , not only the reinforcement part 231 is formed in the second adhesive layer 230 , but also the thickness of the support layer 241 is determined based on the thickness of the first adhesive layer 220 . can

The thickness H1 of the support layer 241 may be smaller than the thickness H2 of the first adhesive layer 220 . In some embodiments, the thickness H1 of the support layer 241 may be 30% to 70%, preferably 40% to 60% of the thickness H2 of the first adhesive layer 220 .

In the case of the conventional waterproof ventilation sheet 20, the thickness of the support layer 27 is set to be similar to the thickness of the first adhesive layer 23, whereas the support layer 241 of the waterproof ventilation sheet 200 according to embodiments of the present invention. The thickness of the first adhesive layer 220 is determined to be 40% to 60% of the thickness. Accordingly, not only the extent to which the support layer 241 is stretched in the direction of the ventilation hole is reduced, but also the pressure applied to the waterproof ventilation layer 210 by the stretched support layer 241 is reduced, so that the stretched support layer 27 and the waterproof ventilation layer ( 21) has an effect that the damage of the portion (B portion) in contact with each other can be prevented.

According to embodiments of the present invention, the second adhesive layer 230 may have a reinforcing part 231 disposed to protrude further inward than the first adhesive layer 220 may be formed, and a waterproof ventilation layer ( The pressure applied to the 210 is dispersed by the reinforcing part 231 , thereby preventing damage to the waterproof ventilation layer 210 . In addition, even if damage occurs in the waterproof ventilation layer 210, the damaged portion is blocked by the reinforcing part 231, so moisture or foreign matter does not flow into the interior of the waterproof ventilation sheet 200 through the damaged portion. have.

According to embodiments of the present invention, the thickness of the support layer 241 may be determined based on the thickness of the first adhesive layer 220, and accordingly, the extent to which the support layer 241 is stretched in the vent hole direction is reduced as well as the stretched support layer. The pressure applied to the waterproof ventilation layer 210 by 241 is reduced, so that damage to the waterproof ventilation layer 210 can be prevented.

Although the preferred embodiment according to the present invention has been described above, it can be modified in various forms, and those skilled in the art can make various modifications and modifications without departing from the scope of the claims of the present invention. It is understood that it can be implemented.

The present invention relates to a waterproof breathable sheet.

Claims

In the waterproof ventilation sheet,

a waterproof breathable layer having a waterproof function and configured to allow air to pass therethrough;

a first adhesive layer attached to the lower surface of the waterproof breathable layer; and

and a second adhesive layer attached to the upper surface opposite to the lower surface of the waterproof breathable layer,

The first adhesive layer and the second adhesive layer are formed in a ring shape including an opening,

The inner diameter of the first adhesive layer is greater than the inner diameter of the second adhesive layer,

waterproof breathable sheet.
According to claim 1,

The second adhesive layer comprises a reinforcing part disposed closer to the center of the waterproof breathable layer than the first adhesive layer,

waterproof breathable sheet.
According to claim 1,

The second adhesive layer includes a reinforcing part disposed on a portion opposite to a portion where the first adhesive layer is not disposed among the lower surface of the waterproof breathable layer among the upper surface of the waterproof breathable layer,

waterproof breathable sheet.
According to claim 1,

The inner surface of the first adhesive layer is disposed farther away from the center of the waterproof breathable layer than the inner surface of the second adhesive layer,

waterproof breathable sheet.
According to claim 1,

The width of the first adhesive layer is smaller than the second width of the second adhesive layer,

waterproof breathable sheet.
According to claim 1, wherein the waterproof ventilation sheet,

Further comprising a support layer attached to the upper surface of the second adhesive layer,

waterproof breathable sheet.
7. The method of claim 6,

The support layer is made of a porous material containing at least one of polyethylene terephthalate (PET), polypropylene (PP), polyethylene (PE), and nylon (Nylon),

waterproof breathable sheet.
7. The method of claim 6,

The thickness of the support layer is 40% to 60% of the thickness of the first adhesive layer,

waterproof breathable sheet.