WO2017088721A1

WO2017088721A1 - Manufacturing methods for inner core material used for vacuum insulation panel and vacuum insulation panel

Info

Publication number: WO2017088721A1
Application number: PCT/CN2016/106701
Authority: WO
Inventors: 王振安; 吴志煌; 罗宇彦
Original assignee: 福建赛特新材股份有限公司
Priority date: 2015-11-23
Filing date: 2016-11-22
Publication date: 2017-06-01
Also published as: CN106015839A

Abstract

A manufacturing method for an inner core material used for a vacuum insulation panel comprises the following steps: manufacturing non-woven fabrics from multiple glass fibers and low-melting-point organic fibers by utilizing a dry non-woven process, in the step, most of the multiple glass fibers extending in a direction basically parallel to surfaces of the manufactured non-woven fabrics; and laminating the multiple non-woven fabrics. The inner core material manufactured by using the method has an excellent heat insulation performance, and the manufacturing method is simple in production process and low in cost.

Description

Internal core material used in vacuum insulation panel and method for manufacturing vacuum insulation panel

Technical field

The present invention relates to a method for manufacturing an inner core material and a vacuum insulation panel for use in a vacuum insulation panel.

Background technique

The vacuum insulation board is a high-efficiency new insulation insulation material combined with the vacuum insulation principle and the traditional insulation material. It is widely used in refrigerators, incubators, building walls, refrigerated containers, etc. It consists of membrane materials, core materials, getter materials and so on.

At present, the core material is mostly made of a material having a multi-void ratio, a pore connection, and a low thermal conductivity. Most of the core material production adopts the wet production process, that is, the glass fiber or glass wool, flame cotton, etc. are beaten, paper-made, dried, and cut to make the core material, but the energy consumption is high, the process is complicated, and the cost is high. .

The invention relates to a short glass fiber adopting an improved non-woven process technology to dryly produce a vacuum insulation plate core material, and solves the problem of the wet process production of the glass fiber core material.

Summary of the invention

The main technical problem to be solved by the present invention is to provide a method for manufacturing an inner core material used in a vacuum insulation panel, which has an excellent internal heat insulation performance, and has a simple production process and a low cost.

In order to solve the above technical problems, the present invention provides a method for manufacturing an inner core material used in a vacuum insulation panel, comprising the following steps:

a step of manufacturing a nonwoven fabric by using a dry non-woven process using a plurality of glass fibers and a low-melting-point organic fiber; in this step, a majority of the plurality of glass fibers are in the nonwoven fabric manufactured The surface extends in substantially parallel directions;

A step of laminating a plurality of the nonwoven fabrics.

In a preferred embodiment: the glass fibers have an average fiber diameter of from 6 to 15 μm and an average fiber length of from 10 to 50 mm.

In a preferred embodiment, the method of manufacturing a plurality of glass fibers and low-melting-point organic fibers by using a dry non-woven process comprises: opening and combing a plurality of glass fibers and low-melting organic fibers. Thereafter, monofilamentized glass fibers are formed; and the monofilamentized glass fibers are further formed into the nonwoven fabric in an air laid machine.

In a preferred embodiment, the opening means that a plurality of glass fibers and low melting point organic fibers are opened twice by an opener and a fine opener.

In a preferred embodiment, the carding means that a plurality of glass fibers and low melting point organic fibers which have been subjected to two opening operations are passed through a cotton carding machine and a special fiberglass carding machine.

In a preferred embodiment, the static eliminating device is mounted on the opening machine, the fine opening machine, the cotton carding machine, and the fiberglass special carding machine.

In a preferred embodiment, the step of laminating a plurality of the non-woven fabrics specifically refers to: reciprocating a plurality of the non-woven fabrics by a clamp-type laying machine, and entering the double-layer type Hot press setting furnace hot pressing setting.

In a preferred embodiment, the two-layer hot press setting furnace has a hot pressing temperature of 200 to 350 °C.

In a preferred embodiment, the plurality of nonwoven fabrics are laminated to form a glass fiber laminate, and the glass fiber laminate is compacted by hot pressing, and the fiber laminate is passed through. It is formed into a plate shape by hot pressing, and the surface is smooth and flat.

In a preferred embodiment, the plurality of nonwoven fabrics are laminated and then hot pressed without forming a laminate in a plate shape.

In a preferred embodiment, there is further included a step of subjecting the heat-pressed glass fiber laminate to longitudinal slitting and cross-cutting.

The invention also provides a method for manufacturing a vacuum insulation panel, comprising the following steps:

a step of laminating a plurality of the nonwoven fabrics;

The step of accommodating a plurality of the stacked nonwoven fabrics inside the outer covering material and maintaining the inside of the outer covering material in a reduced pressure state.

Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

The invention provides a method for manufacturing an inner core material used in a vacuum insulation panel, which uses a dry non-woven process to make the glass fiber substantially completely single-fibrillated, and then the air-laid non-woven fabric is thin. The grammage can be around 50-100 g/m ² . Since the glass fiber is stretched in the carding machine, the glass fiber is straight, the glass fiber is not bent, the glass fiber is evenly distributed in the horizontal plane, and there is no through-glass fiber in the plane of the vertical nonwoven fabric, so the layer of the plurality of laminated nonwoven fabrics is laminated. A lot, glass fiber and fiberglass have only a few point contacts. In addition, the non-woven fabric and the non-woven fabric are bonded by the melted organic fiber, so that the void formed by the glass fiber contact and the nonwoven fabric lamination is not filled with the adhesive, the heat conduction area is reduced, and the heat insulation performance is greatly improved.

DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a flow chart showing the production of a preferred embodiment 1 of the present invention.

detailed description

The invention is further illustrated by the accompanying drawings and specific embodiments.

Example 1

Referring to Figure 1, the present embodiment uses a dry non-woven process technology to produce an inner core material for use in a vacuum insulation panel, using glass fibers and a small amount of low-melting organic fibers, by opening, mixing, combing, air-laid, and gripping. Paving machine, heat setting machine, hot roll, vertical and horizontal cutting machine and other equipment to produce the inner core material used in vacuum insulation board.

The specific production steps are as follows:

1 raw material ratio: alkali-free glass fiber 90-99%, glass fiber average fiber diameter of 7-15μm, average fiber length of 10-50mm; low melting polyester fiber 1-10%;

2 process flow:

1) The glass fiber and the low-melting polyester fiber are dispersed and loosened by a two-way opening machine, and a part of the glass short fiber is monofilamentized.

2) The glass fiber and the low-melting polyester fiber which have passed through two opening machines are carded by a carding machine to further monofilamentize the glass fiber and the low-melting polyester fiber, and the glass fiber and the low-melting polyester fiber are straightened, and Clean up impurities and remove very fine fibers.

Glass fiber and other organic fiber properties have the following different characteristics:

(1) The relative density of glass fiber is about twice that of synthetic fiber.

(2) The glass fiber has a round bar shape, the surface is smooth, no curling, and the cohesion of the fiber and the fiber is small.

(3) Glass fiber brittle material, not resistant to folding, not wearable

Therefore, in the selection of the carding machine, it is necessary to comprehensively screen and improve from the carding machine and the carding machine:

(1) Improved feeding device, designed feeding device ensures that the glass fiber can enter the carding machine evenly and smoothly

(2) For the characteristics of glass fiber, choose a suitable card clothing, analogous to the use of horizontal stripes, increase the grip of the card fiber to increase the friction.

(3) Adjust the gauge spacing of the card clothing to improve the carding effect.

(4) Control the speed of the licker, cylinder and transfer roller, reduce the damage to the fiber and improve the combing ability.

(5) The fiber entering the carding machine has some impurities, the fiberglass ratio is large, and it is smooth and has no cohesion. Therefore, a large amount of glass fiber short wire falls into the belly of the machine, causing waste, which requires adjusting the position of the dust removing knife and installing The angle and the distance from the licker roller minimizes the amount of fiberglass that falls into the belly.

(6) Due to the brittleness of the glass fiber, the size of the gauge should be adjusted to avoid excessive combing damage to the glass fiber, and breakage, resulting in a large amount of glass fiber pulverization.

3) The glass fiber and the low-melting polyester fiber after the two opening machines and the carding machine are dropped on the perforated mesh curtain to form a non-woven fabric under the action of the working roller and the negative pressure of the air-laid machine.

Because glass fiber and low-melting polyester fiber should be rubbed with the moving machinery in the spinning equipment such as opening, carding, air-laid, etc., it is easy to accumulate electric charge on the surface of the fiber, so that the fiber and the fiber are repelled, and the fiber and the machine are The fibers are attracted to each other such that the glass fibers and the low-melting polyester fibers are agglomerated at the cylinders of the carding machine, the cages or corners of the air-laid machine. Therefore, the glass fiber and the low-melting-point polyester fiber are poorly combed, and the air-laid nonwoven fabric is poor in uniformity. In order to overcome the effects of static electricity, the following means are needed:

(1) Install anti-static devices on the opener, carding machine and air-laid machine. We use ion wind bar and ion wind nozzle:

The ion wind bar and the ion tuyere can generate a large number of air masses with positive and negative charges, which are blown out by the compressed gas at high speed, and can neutralize the electric charge on the object. When the static electricity on the surface of the object is negative, it attracts. Positive charge in the airflow, which attracts negative airflow when the surface of the object is positively charged The electric charge, so that the static electricity on the surface of the object is neutralized, so as to eliminate the static electricity on the surface of the fiber;

(2) spraying an antistatic agent on the glass fiber and the low melting point polyester fiber before opening;

(3) Glass fiber is added with antistatic agent in the production sizing agent;

(4) Humidifier is used in the production workshop to maintain the humidity of the production workshop at 60-75%.

4) The air-laid glass fiber and a small amount of low-melting organic synthetic fiber mixed non-woven fabric have a weight of 50-100 g/m ² , and the nonwoven fabric is laminated by a clamp cross-lapper (ie, a single-layer non-woven fabric net) The layer was folded back and forth at 90 degrees to form a glass fiber laminate having a basis weight of 500 to 5000 g/m ² .

If it is necessary to make a 10 mm thick vacuum insulation panel, the glass fiber laminate core material has a basis weight of about 2500 g/m 2 , and the cross-lapper is used to laminate 32 to 50 layers of the nonwoven fabric. If it is necessary to make a vacuum insulation panel of the remaining thickness, the number of layers of the nonwoven fabric laminate may be adjusted as needed.

5) Clamp the cross-lapper to make the glass fiber laminate into the hot press setting machine. The double-layer hot press setting machine consists of three sections: two sections with natural gas heating device, length 6 meters, control temperature 200-250 ° C and A section of cooling zone with a chiller, 3 meters long. The heating temperature control is for the low melting point polyester fiber to melt and bond the glass fiber to form a core material with better strength.

6) The glass fiber laminate from the hot press setting machine enters a pair of hot roll rolls, and the hot roll is heated by electric heating or heating oil to 200-250 ° C to compact the surface of the glass fiber laminate, and the surface is smooth and flat.

7) The glass fiber laminate passing through the hot roll has a density of 40-120 KG/m ³ , enters slitting, and is cross-cut to obtain a desired core material size.

After the above steps, the inner core material used in the vacuum insulation panel can be made by laminating a plurality of non-woven fabrics; the non-woven fabric is a dry non-woven process for a plurality of glass fibers and low-melting organic fibers. manufacturing;

In the nonwoven fabric, most of the plurality of glass fibers extend in a direction substantially parallel to a surface of the nonwoven fabric.

And the glass fibers have an average fiber diameter of 7 to 15 μm and an average fiber length of 10 to 50 mm.

The content of the glass fiber is 90-99%, and the content of the low melting point organic fiber is 1%-10%.

Due to the use of the dry non-woven process, the glass fibers are substantially completely single-fibrillated, and then the air-laid nonwoven fabric is thin, and the basis weight can be about 50-100 g/m ² . Since the glass fiber is stretched in the carding machine, the glass fiber is straight, the glass fiber is not bent, the glass fiber is evenly distributed in the horizontal plane, and there is no through-glass fiber in the plane of the vertical nonwoven fabric, so the layer of the plurality of laminated nonwoven fabrics is laminated. A lot, glass fiber and fiberglass have only a few point contacts. In addition, the non-woven fabric and the non-woven fabric are bonded by the melted organic fiber, so that the void formed by the glass fiber contact and the nonwoven fabric lamination is not filled with the adhesive, the heat conduction area is reduced, and the heat insulation performance is greatly improved.

The internal core material used in the above vacuum insulation panel has a thermal conductivity of 1.0-1.8 mw/mk. And because the two opening and improved carding machines make the glass fiber substantially completely single-fibrillated, the air-laid felt has a thin basis weight of about 50-80 g/m ² , because the fiber is stretched in the carding machine, The fiber is straight, the fiber is not bent, there is no penetrating fiber in the vertical felt plane, the number of layers is many, the fiber and the fiber have only a few point contact, and the gap formed by the fiber contact and lamination is not filled with adhesive, which reduces the heat conduction area. The thermal insulation performance is better than that of the non-woven fabric produced by the wet method, and has the advantages of simple process, low production cost, energy saving, and no waste water discharge.

Example 2

A method for manufacturing a vacuum insulation panel, comprising the following steps:

a step of laminating a plurality of the nonwoven fabrics;

Storing a plurality of the laminated nonwoven fabrics inside the outer covering material and making the outer covering material The step of maintaining the interior in a decompressed state.

The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or within the technical scope disclosed by the present invention. Alternatives are intended to be covered by the scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Industrial applicability

The present invention uses a dry non-woven process to make the glass fibers substantially completely single-fibrillated, and then the air-laid nonwoven fabric is very thin, and the basis weight can be about 50-100 g/m ² . The glass fiber is stretched in the carding machine, the glass fiber is straight, the glass fiber is not bent, the glass fiber is evenly distributed in the horizontal plane, and there is no vertical fiberglass through the plane of the nonwoven fabric.

Claims

A method for manufacturing an inner core material for use in a vacuum insulation panel, comprising the steps of:

a step of manufacturing a nonwoven fabric by using a dry non-woven process using a plurality of glass fibers and a low-melting-point organic fiber; in this step, a majority of the plurality of glass fibers are in the nonwoven fabric manufactured The surface extends in substantially parallel directions;

A step of laminating a plurality of the nonwoven fabrics.
A method of producing an inner core material for use in a vacuum insulation panel according to claim 1, wherein said glass fibers have an average fiber diameter of 7 to 15 μm and an average fiber length of 10 to 50 mm.
A method of producing an inner core material for use in a vacuum insulation panel according to claim 1, wherein said glass fibers have an average fiber diameter of 6 to 15 μm and an average fiber length of 10 to 50 mm.
A method of manufacturing an inner core material for use in a vacuum insulation panel according to claim 1 or 2 or 3, wherein:

The method for manufacturing a plurality of glass fibers and low-melting-point organic fibers by using a dry non-woven process means that a plurality of glass fibers and low-melting organic fibers are respectively opened and combed to form a monofilamentized glass. a fiber; the monofilamentized glass fiber is further formed into the nonwoven fabric in an air laid machine.
The method for manufacturing an inner core material for use in a vacuum insulation panel according to claim 4, wherein the opening comprises: passing a plurality of glass fibers and a low melting point organic fiber through an opener and a fine opening The machine completes two or more opening operations.
A manufacturer of an inner core material for use in a vacuum insulation panel according to claim 4 or 5. The method is characterized in that: the carding refers to a plurality of glass fibers and low melting point organic fibers which have been opened two or more times and then passed through a cotton carding machine and a special fiberglass carding machine.
The method of manufacturing an inner core material for use in a vacuum insulation panel according to claim 6, wherein the opening, the fine opening, and the carding process are performed in an electrostatic elimination environment.
The method for manufacturing an inner core material for use in a vacuum insulation panel according to claim 1, wherein the step of laminating a plurality of the nonwoven fabrics specifically refers to: a clamp type laying machine A plurality of the non-woven fabrics are reciprocally laid up, and then enter a two-layer hot press setting furnace for hot press setting.
The method of manufacturing an inner core material for use in a vacuum insulation panel according to claim 8, wherein the double-layer hot press setting has a hot pressing temperature of 200 to 250 °C.
The method of manufacturing an inner core material for use in a vacuum insulation panel according to claim 8, wherein the double-layer type hot press setting furnace has a hot pressing temperature of 200 to 350 °C.
The method of manufacturing an inner core material for use in a vacuum insulation panel according to claim 9 or 10, wherein the plurality of the nonwoven fabrics are laminated to form a glass fiber laminate, the glass fiber The laminated body is compacted by hot pressing, and the fiber laminated body is formed into a plate shape by hot pressing.
The method of producing an inner core material for use in a vacuum insulation panel according to claim 9 or 10, wherein the plurality of the nonwoven fabrics are laminated and then hot pressed without being laminated into a plate shape. body.
A method of manufacturing an inner core material for use in a vacuum insulation panel according to claim 11, further comprising a step of subjecting the heat-treated glass fiber laminate to longitudinal slitting and cross-cutting.
A method for manufacturing a vacuum insulation panel, comprising the steps of:

Step of manufacturing a plurality of glass fibers and low-melting organic fibers by a dry non-woven process In this step, a majority of the plurality of glass fibers extend in a direction substantially parallel to a surface of the manufactured nonwoven fabric;

a step of laminating a plurality of the nonwoven fabrics;

The step of accommodating a plurality of the stacked nonwoven fabrics inside the outer covering material and maintaining the inside of the outer covering material in a reduced pressure state.