KR102451661B1 - Thermal screen and method for manufacturing thereof - Google Patents

Abstract

The present invention relates to a thermal curtain. The thermal curtain is made by interposing a heat-insulating nonwoven fabric composed of 20 to 90% by weight of polyester fibers and 10 to 80% by weight of low-melting polyester fibers between polyester matt weave fabrics. According to the present invention, fusion between the fibers is generated by the low-melting fiber in the nonwoven fabric for padding of a middle layer constituting the thermal curtain, thereby improving the heat retention of the thermal curtain.

Description

Thermal screen and method for manufacturing thereof

The present invention relates to a thermal insulation curtain, and more particularly, it insulates the inside and outside of the plastic house to protect the internal heat, and absorbs or drains the moisture condensing on the inside surface of the plastic house generated by dew condensation according to the temperature difference between inside and outside. It relates to a thermal insulation curtain for installation inside and outside that can enhance the thermal insulation effect by the air layer formed while being able to send it.

In Korea's agriculture, facility cultivation consumes a lot of energy, and heating costs account for 30-40% of operating costs.

Accordingly, as a product for keeping the greenhouse insulated, a multi-layer thermal insulation curtain made by combining PE foam and chemical cotton in multiple layers is being used.

PE foam and chemical cotton have heat retention, but they absorb moisture and are prone to breakage when used for a long time. Chemical cotton is made of polyester material, so it has warmth and elasticity. However, as the volume increases and the moisture absorbed by the cotton falls on the crop in the form of water droplets, pathogens may occur, and the thermal insulation power may decrease if used for a long period of time. PE foam has a low moisture permeability, so humidity management is not easy, and it does not implement a breathable function in which moisture generated inside the greenhouse is discharged as water vapor molecules.

Korean Patent Registration No. 2167783 discloses a multi-layer thermal insulation curtain.

According to the above patent, it is shown that a multi-layer insulating curtain made of a woven fabric, a nonwoven fabric, an airgel nonwoven fabric, a nonwoven fabric and a woven fabric reduces the occurrence of dew condensation and improves the moisture permeability, heat retention and air permeability evenly.

However, the multi-layer insulating curtain has a problem in that the structure and manufacturing are complicated and it is not easy to combine for lamination.

Accordingly, there is a continuous demand for the development of a technology for easily manufacturing products satisfying various characteristics together with the improvement of the thermal insulation performance in the thermal insulation curtain for agriculture.

Republic of Korea Patent Registration No. 2167783 (Multi-layer thermal insulation curtain and manufacturing method thereof)

An object of the present invention is to develop an improved product and a method for manufacturing the same while balancing various characteristics required for a thermal insulation curtain in response to the above-described needs.

In order to solve the above problems, the present invention provides a thermal insulation curtain for agriculture in which a thermal insulation nonwoven fabric composed of 20 to 90% by weight of polyester fibers and 10 to 80% by weight of polyester low-melting fiber is interposed between polyester mart tissue fabrics. to provide.

On the other hand, the present invention is to obtain a bonding web for interlayer padding by mixing and carding, forming a laminated web, and heat-treating so as to consist of 20 to 90% by weight of polyester-based short fibers and 10 to 80% by weight of polyester-based low-melting short fibers step; Laminating the bonding web on the polyester mart tissue fabric, and again laminating the polyester mart tissue fabric, and performing needle punching at predetermined length intervals to obtain a laminate in which the intermediate layer is composed of a nonwoven fabric; and heat-treating the laminate through a hot press roller to obtain a laminate in which the interlayer nonwoven fabric and the fabric are combined;

In addition, preparing a polyester-based short fiber nonwoven; Preparing a polyester-based low-melting short fiber nonwoven fabric; preparing a polyester mart tissue fabric; The polyester-based low-melting short fiber nonwoven fabric, the polyester-based short fiber nonwoven fabric, the polyester low melting point short fiber nonwoven fabric and the polyester mart tissue fabric are sequentially laminated on the polyester mart tissue fabric, and needle punching is performed at a predetermined length interval. to obtain a laminate in which the intermediate layer is composed of a nonwoven fabric; and heat-treating the laminate through a hot press roller to obtain a laminate in which the interlayer nonwoven fabric and the fabric are combined; It provides a method for manufacturing a thermal insulation curtain for agriculture, characterized in that the ester-based low melting point short fiber nonwoven fabric is made of 10 to 80% by weight.

According to the present invention, inter-fiber fusion occurs by the low-melting fiber in the interlayer nonwoven fabric constituting the insulating curtain, and the pores due to the network structure of the nonwoven are converted into a large number of small and closed pores to improve the thermal insulation properties of the insulating curtain. becomes possible

In addition, it is possible to prevent the occurrence of damage to crops by preventing the occurrence of foreign materials in the fiber in the insulating curtain.

On the other hand, in the interlayer nonwoven fabric constituting the thermal insulation curtain, by using coarse fibers and fine fibers in combination, heat retention, moisture permeability, and mechanical properties can be improved while balancing.

On the other hand, the restoring force is increased, so that thickness change due to stretching and pressing is reduced even during repeated use.

1 is a conceptual diagram illustrating a laminated structure of a thermal insulation curtain according to an embodiment of the present invention.
2 is a conceptual diagram illustrating a laminated structure of a thermal insulation curtain according to another embodiment of the present invention.
3 is a process diagram illustrating a manufacturing process of a thermal insulation curtain according to an embodiment of the present invention.
4 is a flowchart illustrating a manufacturing process of a thermal insulation curtain according to another embodiment of the present invention.

The present invention relates to a thermal insulation curtain for agriculture in which an insulating nonwoven fabric composed of 20 to 90% by weight of polyester-based fibers and 10 to 80% by weight of polyester-based low-melting point fibers is interposed between polyester mart tissue fabrics.

In this case, the insulating nonwoven fabric may be composed of a single layer or a plurality of layers made of each fiber as shown in FIGS. 1 and 2 below.

The polyester mart tissue fabric reinforces the strength of the nonwoven fabric constituting the middle layer of the thermal insulation curtain, maintains shape stability because the appearance does not change easily, and exhibits durability against UV rays.

The heat insulating nonwoven fabric may be composed of 20 to 90% by weight of polyester-based fibers and 10 to 80% by weight of polyester-based low-melting fibers to improve heat retention.

The polyester-based fibers may include polyethylene terephthalate fibers, polytrimethylene terephthalate fibers, polybutylene terephthalate fibers, and the like.

The polyester-based low-melting point fiber can improve heat retention by reforming the pores formed by the network structure in the nonwoven fabric into a plurality of small and closed pores by fusion.

In the manufacturing process, the polyester-based low-melting point fiber is a composite fiber composed of a polyester-based elastomer having a melting point of 110 to 200° C. and a polyester fiber having a melting point higher than 50° C. It is more preferable because the shape of the fiber is maintained during heat treatment to improve the tear strength of the nonwoven fabric, and it can be thermoformed at a high temperature and has elasticity to improve processability for the manufacturing process and use.

The polyester-based elastomer is preferably a block copolymer ether ester containing polybutylene terephthalate as a hard segment and polyoxybutylene glycol as a soft segment in terms of adhesion to other short fibers, temperature characteristics, and strength.

The low-melting polyester fiber is, for example, 38% by weight of polybutylene terephthalate and 62% by weight of polytetramethylene glycol obtained by polymerizing an acid component mixed with terephthalic acid and isophthalic acid (80/20 mol%) and butylene glycol. %, it is possible to use a composite fiber obtained by heating and reacting block copolymerized polyether polyester, which is a thermoplastic elastomer having a melting point of 155° C., as a sheath component, and polyethylene terephthalate as a core component.

The composite fiber has a heat fusion component exposed on the surface, and may be in the form of a side-by-side (parallel) type, a core sheath type, an eccentric sheath type, or the like.

When the core component of the core sheath fiber is polyethylene terephthalate, other fibers and core components constituting the nonwoven fabric form a network structure, so the shape stability of the nonwoven fabric can be improved.

It is preferable that the ratio of the heat-sealing component in the composite fiber is 30 to 50% by weight. If it is less than 30% by weight, the formation of closed pores by fusion in the nonwoven fabric decreases, and if it exceeds 50% by weight, the fusion occurs excessively, so that air permeability, Moisture permeability may decrease.

The basis weight of the interlayer nonwoven fabric is preferably 50 to 500 g/m2, and if it is less than 50 g/m2, the strength of the nonwoven fabric and the interfiber voids decrease, and if it exceeds 500 g/m2, the flexibility and moisture permeability decrease.

The manufacturing method of the thermal insulation curtain for agriculture of the present invention includes mixing and carding so as to consist of 20 to 90% by weight of polyester-based short fibers and 10 to 80% by weight of polyester-based low-melting short fibers, forming a laminated web, and heat-treating the intermediate layer obtaining a bonding web for padding; Laminating the bonding web on the polyester mart tissue fabric, and again laminating the polyester mart tissue fabric, and performing needle punching at predetermined length intervals to obtain a laminate in which the intermediate layer is composed of a nonwoven fabric; and heat-treating the laminate through a hot press roller to obtain a laminate in which the interlayer nonwoven fabric and the woven fabric are combined;

In addition, the method of manufacturing a thermal insulation curtain for agriculture of the present invention comprises the steps of preparing a polyester-based short fiber nonwoven fabric; Preparing a polyester-based low-melting short fiber nonwoven fabric; preparing a polyester mart tissue fabric; The polyester-based low-melting short fiber nonwoven fabric, the polyester-based short fiber nonwoven fabric, the polyester low melting point short fiber nonwoven fabric and the polyester mart tissue fabric are sequentially laminated on the polyester mart tissue fabric, and needle punching is performed at a predetermined length interval. to obtain a laminate in which the intermediate layer is composed of a nonwoven fabric; and heat-treating the laminate through a hot press roller to obtain a laminate in which the interlayer nonwoven fabric and the woven fabric are combined.

In this case, the multi-layered nonwoven intermediate layer is preferably composed of 20 to 90% by weight of the polyester-based short fiber nonwoven fabric layer and 10 to 80% by weight of the polyester-based short fiber nonwoven fabric layer to improve heat retention. .

As the polyester-based staple fibers, polyester-based staple fibers having a melting point of 50° C. or higher than the melting point of the fusion component of the polyester-based low-melting staple fibers may be used without limitation.

It is preferable to use the polyester-based short fibers having a fineness of 10 to 20 denier and a length of 22 to 127 mm.

The polyester-based low-melting short fibers have a fineness of 0.5 to 8 denier, a length of 22 to 127 mm, and to use non-crimped ones, because the fineness is small, the number of fibers in the nonwoven fabric increases and is greatly increased by the large fineness fibers. The formed pores are partially closed by fusion to provide a large number of small pores to improve heat retention, and when fusion is achieved, fusion in a wide range can be achieved, and the mechanical strength of the nonwoven can not be lowered, and the surface of the nonwoven fabric This softens, so that smoothness, moldability, and workability can be improved.

In the nonwoven fabric of the present invention, when the polyester fiber is used as the sedeneer, the heat retention is improved, but the breathability and moisture permeability are reduced.

The present invention can balance the heat retention, mechanical strength, breathability and moisture permeability of the nonwoven fabric by using a nonwoven fabric prepared by mixing the polyester-based low-melting fiber of the tadenier with the polyester-based fiber of the tadenier.

In the step of obtaining the bonding web, the fusion component of the polyester-based low-melting short fibers is melted by heat treatment to obtain a bonding web in which the fibers are bonded.

For the heat treatment, a conventional heat treatment method in which the fusion component can be fused may be used without limitation. The heat treatment temperature is preferably performed at a temperature higher than the melting point of the fusion component by 10°C to 50°C.

The occurrence of fibrous fluff is suppressed and smoothness is improved on the surface of the bonding web thus obtained, and in the subsequent process, the bonding web has elasticity and flexibility in the lamination process in which the bonding web is interposed between the polyester mart tissue fabrics, so that wrinkles during lamination This does not occur and processing can be facilitated.

In the manufacture of a thermal insulation curtain having a single-layer nonwoven intermediate layer, the step of obtaining the laminate is to strengthen the entanglement of fibers by needle punching on the laminate laminated with the bonding web, so that the mechanical strength of the nonwoven fabric is improved, It is possible to partially open the closed pores again by means of a fine needle so that breathability and moisture permeability can be maintained.

In the manufacture of a thermal insulation curtain having a multi-layer non-woven interlayer, in the step of obtaining the laminate, the non-woven fabric is laminated and pre-heat-treated to interlayer fusion with the polyester-based low-melting short fiber nonwoven fabric after interlayer bonding. Needle punching or lamination and interlayer bonding by needle punching without prior heat treatment may be performed.

In the step of obtaining the combined laminate, a heat treatment may be performed by passing through a heated press roller to thermocompression bonding.

In the case of thermocompression bonding, it is preferable to press the laminate between the heating cylinder and the cooling cylinder to bond the nonwoven fabric and the polyester fabric by fusion, followed by cooling through the cooling cylinder to fix it.

When temperature and pressure are applied in the heating cylinder treatment, the surface of the laminate and the interface between the nonwoven fabric and the polyester fabric become an iron-like state, and smoothness is improved.

On the other hand, the thermocompression bonding may be selectively performed only on the part where needle punching is made.

According to the manufacturing method of the present invention, the bonding is made between the nonwoven fabric and the polyester mart tissue fabric by heat treatment to provide a strong insulating curtain that does not separate the layers.

On the other hand, in the manufacturing method using the single-layer nonwoven fabric by mixing, the thermal insulation is improved without reducing the mechanical strength, breathability, and moisture permeability provided by the Tadenier fiber by forming more partially closed small-sized pores. make it possible

According to the present invention, it is possible to manufacture a thermal insulation curtain by a more simplified process, and while forming a thin nonwoven fabric, thermal insulation, breathability, moisture permeability, and mechanical strength can be balanced.

In addition, it is possible to prevent damage to crops by foreign substances (fibers) even when an agricultural thermal insulation curtain is used because the generation of wool and the loss of fibers are suppressed.

On the other hand, the polyester-based low-melting point fiber, low heat shrinkable low melting point crystalline polyester fiber or low heat shrinkable low melting point crystalline polyester as a fusion component constitutes the sheath as a fusion component, and polyester is used as a core sheath type composite fiber constituting the core. can

The fiber is a crystalline fiber in which the fusion component has a melting point of 150 to 200° C., and when heat treatment is performed at 120° C., it is preferable that the dry heat shrinkage is 5% or less.

If the melting point of the fusion component is less than 150 ° C, adhesion between single yarns occurs when manufacturing fibers by melt spinning, resulting in poor spinning properties, and it is difficult to lower the dry heat shrinkage rate to 5% or less. Therefore, thermal changes may occur, which may damage the texture or physical properties of the fibers.

In general, amorphous fibers or fibers with few crystals cannot be heat-treated in the fiber manufacturing process, so it is difficult to manufacture low heat-shrinkable fibers.

However, since the crystalline fiber can be subjected to heat treatment during the manufacturing process of the fiber, it becomes possible to have a low thermal contraction rate.

At this time, in the case of heat treatment at 120°C, fibers with dry heat shrinkage of more than 5% increase shrinkage during the heat treatment of the web, resulting in poor dimensional stability. can occur

The polyester constituting the low heat shrinkable low melting point crystalline fiber is preferably prepared by copolymerizing 30 to 70 mol% of a 1,4-butanediol component with respect to the entire glycol component using terephthalic acid and ethylene glycol as raw materials.

If it is out of the above mole %, the melting point is not good outside the scope of the present invention.

In general, when manufacturing a nonwoven fabric, shrinkage occurs when heat bonding is performed during a heat treatment process.

However, the low heat shrinkable low melting point crystalline fiber has crystallinity when the fusion component melts and entangles the fiber during the heat treatment process when manufacturing the nonwoven fabric of the present invention to suppress shrinkage, so the dimensional stability and flexibility of the nonwoven fabric can be improved. have.

In addition, since shrinkage does not occur even after lamination with polyester fabric and heat treatment, the phenomenon of wrinkling of the laminate does not occur.

Hereinafter, the present invention will be described in more detail based on the following Examples and Comparative Examples.

However, the following examples are only for illustrating the present invention, and the present invention is not limited by the following examples, and can be substituted and changed to other equivalent examples without departing from the technical spirit of the present invention. It will be apparent to those of ordinary skill in the art to which the present invention pertains.

[Example 1]

Polyethylene terephthalate short fibers (fineness 15 denier, length 51 mm) 90% by weight and low-melting fibers (fineness 6 denier, length 51 mm, the core part is polyethylene terephthalate having a melting point of 258 ° C. and an intrinsic viscosity of 0.7, and a sheath ) A core-sheath composite yarn composed of a polyester elastomer having an added melting point of 155°C) 10% by weight) is mixed in a honta-myeon process, a carding process is performed to form a laminated web, and heat treatment at 180°C for 1 minute to prepare a bonding web did.

As shown in FIG. 2 below, the laminate is laminated with the bonding web on a polyester mart tissue fabric and then needle punched at a predetermined length interval to a laminate formed by laminating a polyester mart tissue fabric again, and the intermediate layer is composed of a nonwoven fabric. Insulation curtain consisting of a laminate in which a nonwoven fabric having a basis weight of 100 g/m 2 is bonded between the fabrics by heat treatment (temperature 185° C., linear pressure 25 kg/cm, speed 10 m/min) passing the laminate through a hot press roller was prepared.

[Example 2]

In Example 1, a thermal insulation curtain was manufactured in the same manner as in Example 1, except that the polyethylene terephthalate short fibers were 20% by weight and the low-melting-point fibers were 80% by weight.

[Example 3]

In Example 1, the same method as in Example 1 was used, except that the polyethylene terephthalate short fibers were 70% by weight and the fineness was 10 denier, and the low-melt fiber was 30% by weight and the fineness was 2 denier. Curtains were made.

[Example 4]

In Example 3, a thermal insulation curtain was manufactured in the same manner as in Example 3, except that the low-melting-point fiber used a low-heat-shrinkable core-sheath low-melting fiber.

At this time, the low heat shrinkable core-sheath low-melting fiber was prepared as follows.

As a crystalline low-melting polyester, a copolymerized polyester having an intrinsic viscosity of 0.78, Tc 98°C, Tm 181°C, and Tg 48°C obtained by copolymerizing 1,4-butanediol by 50 mol% was prepared.

The crystalline low-melting polyester is used as a second component, polyethylene terephthalate is used as a core component, and both polyesters are used as a composite ratio (core/second) of 50/50, a spinning temperature of 270° C., a discharge amount of 408 g/min, and a spinning speed. Under the condition of 850 m/min, undrawn yarn was obtained by discharging with a deep-sheath composite spinning nozzle with a circular cross section of 225 holes.

After converging the undrawn yarn and making it into a yarn bundle of 12 ktex, it is drawn at a draw ratio of 4.2 times and a draw temperature of 50° C., and is subjected to a draft heat treatment of a draft ratio of 1.01 times with a heat drum at 150° C. After making it adhere, it was crimped and cut to prepare a low-heat-shrinkable core-sheath low-melting fiber having a single fiber fineness of 5 denier and a fiber length of 51 mm.

The dry heat shrinkage of the low heat shrinkable core-sheath low-melting fiber was 4.2%.

[Example 5]

A polyester-based short fiber nonwoven fabric (113 gsm) prepared using polyethylene terephthalate short fibers (fineness of 15 denier, length of 51 mm) was prepared.

Low-melting fiber (Core-sheath composite yarn composed of a polyester-based elastomer with a fineness of 6 denier, a length of 51 mm, a core part made of polyethylene terephthalate with a melting point of 258 ° C and an intrinsic viscosity of 0.7, and a melting point of 155 ° C.) A polyester-based low-melting-point short-fiber nonwoven fabric (20 gsm) prepared using was prepared.

At this time, the low-melting fiber is a mixture of terephthalic acid and isophthalic acid (80/20 mol%) by polymerization of butylene glycol with 38 wt% of polybutylene terephthalate and 62 wt% of polytetramethylene glycol and heating reaction A composite fiber containing block copolymerized polyether polyester, which is a thermoplastic elastomer having a melting point of 155° C., as a sheath component, and polyethylene terephthalate as a core component, was used.

A polyester mart tissue fabric was prepared.

The low-melting short fiber nonwoven fabric, the polyester short fiber nonwoven fabric, the low melting point short fiber nonwoven fabric and the polyester mart tissue fabric are sequentially laminated on the polyester mart tissue fabric, and needle punching is performed at a predetermined length interval to form an intermediate layer as a nonwoven fabric. The constituted laminate was obtained.

Heat treatment (temperature 185° C., linear pressure 25 kg/cm, speed 10 m/min) passing the laminate through a hot press roller was performed to prepare a thermal insulation curtain composed of a laminate in which an interlayer nonwoven fabric was bonded between fabrics.

[Comparative Example 1]

In Example 1, a thermal insulation curtain was manufactured in the same manner as in Example 1, except that the polyethylene terephthalate short fibers were 100% by weight and the low-melting-point fibers were 0% by weight.

[Comparative Example 2]

In Example 1, a thermal insulation curtain was manufactured in the same manner as in Example 1, except that the polyethylene terephthalate short fibers had a fineness of 6 denier.

[Comparative Example 3]

In Example 1, a thermal insulation curtain was manufactured in the same manner as in Example 1, except that heat treatment was not performed to adhere the bonding web.

Characteristics of the insulating curtains of Examples and Comparative Examples were evaluated using the following method, and the results are shown in Table 1 below.

1. Warming rate

It is measured according to KS K 0560 (Method for measuring thermal insulation of fabric).

2. Water vapor permeability

According to the test method (calcium chloride method) of KS K 0594, take 250 g of a specimen, put it on a cup containing a desiccant calcium chloride solution, and place it in a constant temperature and humidity chamber at a constant temperature and humidity. After a certain period of time, the cup is weighed. Measure the amount of water absorbed through the specimen (g/m2/day).

3. Tensile strength

It is measured according to KS K 0521 method.

division Insulation rate (%) Moisture permeability (g/m2/day) Tensile strength (MD) Tensile strength (CD) Example 1 74.2 109.4 36.9 15. Example 2 76.6 103.3 40.7 16.8 Example 3 75.5 106.8 34.8 14.2 Example 4 75.4 107.1 35.3 14.7 Example 5 77.5 100.6 34.3 14.3 Comparative Example 1 68.8 115.9 31.8 11.3 Comparative Example 2 72.2 98.3 32.2 11.9 Comparative Example 3 73.1 114.3 33.0 12.8 * Tensile strength is measured only for non-woven fabrics
** In the tensile strength, Example 5 measured only the polyester short fiber nonwoven fabric

From the results in Table 1, it is confirmed that the properties of the examples are improved while balancing the properties compared with those of the comparative example. That is, it can be seen that the heat retention is improved without deterioration of moisture permeability and mechanical properties of the embodiment.

On the other hand, in Comparative Example 1, there was no fiber foreign matter during the manufacturing process of the thermal insulation curtain and the use of the manufactured thermal insulation curtain, compared with that of Comparative Example 1.

On the other hand, in Comparative Example 3, some wrinkles occurred, but in Example 3, a smooth surface was shown without wrinkles.

On the other hand, in the insulating curtain of Example 5, since the low melting point nonwoven layer is interposed between the polyester mart tissue fabric and the polyester short fiber nonwoven fabric layer, the surface ironing effect is expressed when heat treatment is performed after needle punching, It is confirmed that the surface of the sealed laminate is smooth and smooth, the interlayer bonding strength is increased, and the fiber foreign material does not occur and the laminated layer maintains a stable shape by elasticity.

Claims (7)

A heat-insulating nonwoven fabric composed of 20 to 90% by weight of polyester fiber and 10 to 80% by weight of polyester low-melting fiber is interposed between polyester mart tissue fabrics,
The polyester fiber has a fineness of 10 to 20 denier and a length of 22 to 127 mm,
The polyester-based low-melting fiber, the fineness is 0.5 to 8 denier, the length is 22 to 127 mm and is not crimped,
As a core sheath type composite fiber, when the sheath part is heat-treated at 120°C, it is a low heat shrinkable low melting point crystalline polyester with a dry heat shrinkage of 5% or less, and the core part is polyester,
The low heat shrinkable low melting point crystalline polyester is an agricultural insulation curtain, characterized in that it is prepared by copolymerizing 30 to 70 mol% of 1,4-butanediol with respect to the total glycol component using terephthalic acid and ethylene glycol as raw materials. delete Mixing and carding so as to consist of 20 to 90% by weight of polyester-based short fibers and 10 to 80% by weight of polyester-based low-melting short fibers, forming a laminated web, and heat-treating to obtain a bonding web for interlayer padding;
Laminating the bonding web on the polyester mart tissue fabric, and again laminating the polyester mart tissue fabric, and performing needle punching at predetermined length intervals to obtain a laminate in which the intermediate layer is composed of a nonwoven fabric; and
A step of heat-treating the laminate through a hot press roller to obtain a laminate in which the interlayer nonwoven fabric and the fabric are combined;
The polyester-based short fibers have a fineness of 10 to 20 denier and a length of 22 to 127 mm,
The polyester-based low-melting short fibers have a fineness of 0.5 to 8 denier, a length of 22 to 127 mm, and are not crimped,
As a core sheath type composite fiber, when the sheath part is heat-treated at 120°C, it is a low heat shrinkable low melting point crystalline polyester with a dry heat shrinkage of 5% or less, and the core part is polyester,
The low heat shrinkable low melting point crystalline polyester is prepared by copolymerizing 30 to 70 mol% of 1,4-butanediol with respect to the entire glycol component using terephthalic acid and ethylene glycol as raw materials. . Preparing a polyester-based short fiber nonwoven fabric;
Preparing a polyester-based low-melting short fiber nonwoven fabric;
preparing a polyester mart tissue fabric;
The polyester-based low-melting short fiber nonwoven fabric, the polyester-based short fiber nonwoven fabric, the polyester low melting point short fiber nonwoven fabric and the polyester mart tissue fabric are sequentially laminated on the polyester mart tissue fabric, and needle punching is performed at a predetermined length interval. to obtain a laminate in which the intermediate layer is composed of a nonwoven fabric; and
A step of heat-treating the laminate through a hot press roller to obtain a laminate in which the interlayer nonwoven fabric and the fabric are combined;
The polyester-based short fibers have a fineness of 10 to 20 denier and a length of 22 to 127 mm,
The polyester-based low-melting short fibers have a fineness of 0.5 to 8 denier, a length of 22 to 127 mm, and are not crimped,
As a core sheath type composite fiber, when the sheath is heat treated at 120°C, it is a low heat shrinkable low melting point crystalline polyester with a dry heat shrinkage of 5% or less, and the core is polyester.
The low heat shrinkable low melting point crystalline polyester is prepared by copolymerizing 30 to 70 mol% of 1,4-butanediol with respect to the entire glycol component using terephthalic acid and ethylene glycol as raw materials,
The intermediate layer is a method of manufacturing a thermal insulation curtain for agriculture, characterized in that the polyester-based short-fiber nonwoven fabric is 20 to 90% by weight and the polyester-based low-melting short fiber nonwoven fabric is 10 to 80% by weight. delete delete 5. The method according to claim 3 or 4,
In the step of obtaining the laminate, lamination and pre-heat treatment are performed to perform interlayer fusion with the polyester-based low-melting short fiber nonwoven fabric, and after interlayer bonding, needle punching or lamination and prior heat treatment is not performed. A method of manufacturing a thermal insulation curtain for agriculture, characterized in that interlayer bonding is performed by needle punching.

Images