WO2005018928A1

WO2005018928A1 - Tarpaulin by using polyolefin group split yarn and method thereof

Info

Publication number: WO2005018928A1
Application number: PCT/KR2003/001967
Authority: WO
Inventors: Hyuk-Chong Kwon
Original assignee: Hyuk-Chong Kwon
Priority date: 2003-08-26
Filing date: 2003-09-26
Publication date: 2005-03-03
Also published as: CA2536505A1; KR20050021763A; EP1660318A1; CN1839033A; KR100523265B1; CN100446969C; AU2003268786A1; JP2007520365A

Abstract

The present invention relates to a tarpaulin by using a polyolefin group resin which is comprised of a polyolefin group woven cloth layer in which a polyolefin group resin is split, drawn and weaved and a polyolefin group resin coating layer manufactured by stacking the polyolefin group resin on both sides of the polyolefin group woven cloth, the tarpaulin comprising a polyolefin group yarn for constructing the polyolefin group woven cloth, the polyolefin group yarn is split with a predetermined width and number, drawn by 7~8 times through a drawing plate, split firstly, performed secondly by a heat setting through a setting plate, twisted and then weaved, and the polyolefin group resin coating layer including a first polyolefin group resin coating layer caoted with a predetermined thickness and color and a second polyolefin group resin coating layer manufacured by stacking a melting polyolefin group resin on the first polyolefin group resin coating layer.

Description

TARPAULIN BY USING POLYOLEFIN GROUP SPLIT YARN AND

METHOD THEREOF

TECHNICAL FIELD The present invention relates to a tarpaulin by using polyolefin

group split yarn and a method for manufacturing the same, and more

particularly to, a tarpaulin by using polyolefin group split and a method for

manufacturing the same in which a polyolefin group resin is slit, then firstly

drawn, thereafter split and secondly set by heat, thereby weaving a woven

cloth. An interception layer for intercepting heat and ultraviolet rays is

coated firstly on the woven cloth by using a polyolefin group resin and then

a layer for reinforcing the strength of the woven cloth is coated secondly

on the interception layer by using the polyolefin group resin.

BACKGROUND ART

Tarpaulins used for a waterproof tent are classified into PVC

(polyvinyl chloride) tarpaulins and PE (polyethylene) tarpaulins according

to used materials. Here, the PVC tarpaulin is prepared by coating PVC on

both surfaces of a PET woven cloth comprised of multi-filament yarns, and

the PE tarpaulin is prepared by coating LDPE (Low Density Polyethylene) on both surfaces of HDPE (High Density Polyethylene) tape yarn.

Processes for manufacturing the PVC tarpaulin are disclosed in detail in

U.S. Patent No. 4,298,645.

However, in the HDPE, it is nearly impossible to manufacture the

woven cloth by means of the above patent method because basically, its

melting tension for working is very large. That is, the tension at the melting

state when working is closely related to drawability. Therefore, when the

melting tension of the resin is maintained properly within the working

range of filament, a good drawability can be obtained in the melting state.

In general, the diameter of a nozzle used in the working equipment of a

multi-filament is about 0.5mm(500μm) and it is about 10 μm after drawing

the multi-filament, therefore, the change of the diameter is reduced by 50

times or more in comparison with that of an earlier multi-filament.

However, because the HDPE has very large melting tension, there is

a limit in drawability. That is, in case of a mono-filament manufactured by

using the HDPE, the ratio of the diameter between the nozzle and filament

is changed by 20 times or less, therefore, it is very difficult to manufacture

a multi-filament yarn.

Also, in general PE tarpaulin, there is a disadvantage that the ratio

between the HDPE and LDPE is 60:40 on the average, when the ratio exceeds that average, the strength of the HDPE woven cloth layer is

deteriorated steeply due to the heat being applied when performing an

LDPE coating and the surface of the woven cloth does not smooth.

In order to improve the foregoing problems, a conventional PE

tarpaulin by using an HDPE split yarn and a manufacturing method thereof

filed by the applicant of the present invention will be described with

reference to Figs 1 to 3.

Figs, la to le are views illustrating processes for manufacturing a

split yarn constructing a conventional PE tarpaulin and Fig. 2 is a

cross-sectional view illustrating a structure of the conventional PE

tarpaulin. Firstly, processes for manufacturing the HDPE split yarn will be

described with reference to Fig. 1.

At first, as shown in Fig. la, a high density polyethylene resin 20 is

slit to several strands 22 by using a cutter and thereafter a surface of each

slit tape yarn is incised with a proper size longitudinally through a splitting

process, thereby obtaining a split yarn, as shown in Fig. lb. Next, by using

a drawing plate 26, the split yarn 24 is drawn about 7-8 times in length.

Thereafter, the drawn split yarn 24 is passed through a setting plate 28 in

order to maintain the drawn state. Accordingly, the drawn split yarn 24 is

maintained as it is. Next, several strands of split yarns 24 is twisted by several times, thereby obtaining a twisted spit yarn 30, as shown in Fig. le. Next, the manufactured PE split yarn 30 is formed to a woven cloth

through a weaving process. A cross-sectional view of the tarpaulin

manufactured by using the split yarn 30 is illustrated at Fig.2. According to

the conventional PE tarpaulin structure, it is comprised of an HDPE woven

cloth layer 30 in which an HDPE yarn is slit to several strips, drawn,

twisted by several times and weaved, and LDPE coating layers 32 and 32'

manufactured by stacking an LDPE resin on both sides of the HDPE woven

cloth layer 30. For convenience's sake, the split yarn and HDPE woven

cloth layer are depicted by the same reference number.

However, in the conventional tarpaulin manufacturing method by

using the HDPE split yarn, as described above, there is a problem: in the

process of Fig. lb, the HDPE yarn which is slit to several strips is split and

then drawn, as shown in Fig. lc, however, in this case, when drawing the

yarn, a large number of yarns are disconnected due to the incised portions

formed to each slit strand, and consequently, it is impossible to

manufacture a good product.

On the other hand, Figs. 3a to 3c are views illustrating processes for

manufacturing a PE tarpaulin according to the conventional art. When the

HDPE woven cloth weaved with a split yarn 40 is carried with a conveyor, as shown in Fig. 3a, a high temperature LDPE resin with a melting state is

stacked on an upper surface of the HDPE woven cloth. The LDPE resin

supplied to the HDPE woven cloth is passed through a pair of rollers

constructed by a cooling roller and a pressing roller and adhered to the

HDEP resin in the melting state, thereby forming an upper LDPE coating

layer 42.

Next, a high temperature LDPE resin is stacked to a lower side of

the HDPE woven cloth and simultaneously the LDPE resin supplied to the

HDPE woven cloth is passed through a pair of rollers constructed by a

cooling roller and a pressing roller and adhered to the HDEP resin in the

melting state, thereby forming a lower LDPE coating layer 42'. As a result,

a tarpaulin as shown in Fig. 3b is manufactured. Both ends of the coated

tarpaulin are cut and then wound to a bobbin, so a finished product or a

semi-finished product is prepared. Referring to Fig. 3c, in the PE tarpaulin manufactured by the above

processes, when the PE tarpaulin is used for forming a thick LDPE coating

layer, a second coating layer is formed at the outer surface of the LDPE

layer. In order to enhance appearance of the PE tarpaulin and prevent

strength of the HDPE woven cloth from deteriorating due to the heat of the

melted LDPE with a constant volume or more, the melted LDPE resin is stacked on the upper surface of the first LDEP coating layer 42 and also on

the lower surface of the first LDPE coating layer 42', thereby forming the

second LDPE coating layers 44 and 44', that is, a tarpaulin with a

double-coating structure. However, as shown in Fig. 3c, according to the tarpaulin

manufactured by the conventional tarpaulin manufacturing method, there is

a disadvantage that a plurality of recess portions are founded at the points

(the first coating layer 42 and the woven cloth layer 40 are met) A formed

by knots. It is called as a crater phenomenon. This phenomenon cannot be

removed because the thickness of the second coating layer 44 coated to

the first coating layer 42 is the same as that of the first coating layer 42.

These portions are represented as recess points, and when viewing the

points through the naked eyes, the finished product looks like a product

having defects. Accordingly, although the points are not related to the

quality of the product, the points affect the appearance of the product.

Also, in general, a double-structure tarpaulin is manufactured by

folding two tarpaulin woven cloths in order to enhance its tear strength. In

this case, not only the crater phenomenon is severely increased and but

also the prominence and depression phenomenon is generated on the

surface of the tarpaulin, so that the appearance of the product is defiled. DISCLOSURE OF THE INVENTION

An object of the present invention is to provide a polyolefin group

tarpaulin by using a polyolefin group split yarn which provides an effect

like a multifilament yarn. The polyolefin group resin is cheap in price and

processed easily, and the equipment for processing the resin is not

complicate, so the cost for equipment is also cheap in price. By using the

polyolefin group yarn, a tape yarn is manufactured, then slit and drawn

firstly, and thereafter the yarn which is drawn and increased its strength is

split and then secondly set by heat.

Another object of the present invention is to provide a polyolefin

group tarpaulin by using a polyolefin group split yarn which prevents a

crater phenomenon like producing recess points on the polyolefin group

woven cloth layer from generating due to the heat applied when coating the

polyolefin group resin such as an LDPE and the like and has an effect for

intercepting heat and ultraviolet rays by forming a polyolefin group resin

layer having a structure processed by a first coating treatment with a

predetermined thickness and color, for example, black color, and

thereafter forming a polyolefin group resin layer having a structure

processed by a second coating treatment with a predetermined thickness, thereby enhancing the appearance of the tarpaulin, capable of intercepting

heat and ultraviolet rays and improving its strength.

Another object of the present invention is to provide a method for

manufacturing a polyolefin group tarpaulin by using a polyolefin group split

yarn which has a smooth and clean surface, improves the strength of the

tarpaulin entirely, enhances the appearance of the tarpaulin and intercepts

heat and ultraviolet rays by slitting and then firstly drawing the polyolefin

group resin, splitting the yarn which is extended and increased its strength,

setting secondly the split yarn by heat through a drawing plate, forming a

polyolefin group woven cloth by twisting the yarn which is set by heat and

maintained, forming a polyolefin group resin coating layer on both sides of

the polyolefin woven cloth layer by firstly coating with a predetermined

thickness and color, for example, black color, and forming a polyolefin

group resin layer to the outside of the first polyolefin resin coating layer by

secondly coating.

In order to provide the above object, there is provided a tarpaulin by

using a polyolefin group resin which is comprised of a polyolefin group

woven cloth layer in which a polyolefin group resin is slit, drawn and

weaved and a polyolefin group resin coating layer manufactured by

stacking the polyolefin group resin on both sides of the polyolefin group woven cloth, the tarpaulin comprising: a polyolefin group yarn for

constructing the polyolefin group woven cloth, the polyolefin group yarn

slit with a predetermined width and number, drawn by 7~8 times in length

through a drawing plate, split firstly, set secondly by heat through a setting

plate, twisted and then weaved, and the polyolefin group resin coating

layer including a first polyolefin group resin coating layer coated with a

predetermined thickness and color and a second polyolefin group resin

coating layer manufactured by stacking a melting polyolefin group resin on

the first polyolefin group resin coating layer. Preferably, a high strength polyolefin group resin or a

polypropylene yarn is positioned at every 3 to 5 split yarns among the

plural slit polyolefin yarns resins which have a predetermine width,

respectively.

More preferably, a thickness of the second coating layer is above

twice than that of the first coating layer.

More preferably, the first coating layer is coated with a block color

or added with a black pigment in order to intercept ultraviolet rays

More preferably, the first coating layer performs a function of a heat

interception layer for intercepting heat applied when forming the second

coating layer. In another aspect of the present invention, there is provided a

method for manufacturing a tarpaulin by using a polyolefin group yarn

which includes steps of slitting, then drawing a polyolefin group resin,

manufacturing a polyolefin group woven cloth by weaving the slit and

drawn yarn, stacking a melting polyolefin group resin on both sides of the

polyolefin group woven cloth layer and thereby forming a polyolefin group

coating layer, the method comprising the steps of: splitting the polyolefin

yarn which is slit with a predetermined width and number and firstly drawn

by 7~8 times in length, setting secondly the polyolefin group split yarn by

heat, twisting and weaving the split yarn maintained as a constant

temperature through the heat setting in the woven cloth forming step,

forming a first polyolefin group resin coating layer with a predetermined

thickness and color on an upper and a lower surfaces of the weaved woven

cloth, and forming a second polyolefin group resin coating layer by

stacking a melting polyolefin group resin with a predetermined thickness

on the outside of the first polyolefin resin coating layer.

BRIEF DESCRIPTION OF THE DRAWINGS

Figs, la to le are views illustrating processes for manufacturing a

split yarn constructing a conventional PE tarpaulin, Fig. 2 is a cross-sectional view illustrating a structure of the

conventional PE tarpaulin,

Figs. 3a to 3c are views illustrating processes for manufacturing a

PE tarpaulin according to the conventional art,

Figs. 4a to 4e are views illustrating processes for manufacturing a

split yarn constructing a polyolefin group tarpaulin in accordance with the

present invention,

Fig. 5 is a cross-sectional view illustrating a structure of the

polyolefin group tarpaulin in accordance with the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

A tarpaulin by using a polyolefin group split yarn and a method for

manufacturing the same in accordance with the present invention will now

be described in detail with reference to the accompanying drawings. Figs. 4a to 4e are views illustrating processes for manufacturing a

split yarn constructing the polyolefin group tarpaulin in accordance with

the present invention and Fig. 5 is a cross-sectional view illustrating a

structure of the polyolefin group tarpaulin in accordance with the present

invention. Firstly, processes for manufacturing the polyolefin group split

yarn will be described with reference to Fig. 4. Referring to Fig. 4a, a polyolefin group resin 200 is firstly slit to

several strands 220 by using a cutter and thereafter the several strands

220 are firstly drawn by using a drawing plate 260, as shown in Fig. 4b.

Thereafter, the surface of the slit and drawn each tape yarn is split with a

constant size, thereby forming a split yarn, as shown in Fig. 4c. Next, by

using a setting plate 280, the split yarn 240 is secondly set by heat, thereby

maintaining the split yarn 240 with a constant temperature, as shown in Fig.

4d. Accordingly, the split yarn 240 maintains its drawn state. Next, each

split yarn is twisted by several times, thereby manufacturing a twisted split

yarn 300, as shown in Fig. 4e.

Next, the polyolefin group split yarn 300 manufactured by above

method is weaved to a woven cloth through a weaving process.

The above processes will be described in detail as follows:

1) Resin is slit longitudinally (Slitting). 2) The slit resin is placed on a drawing plate in which its

temperature sequentially increases up to 100 °C from 50 °C and its length

is about 1 m, and then when the resin is drawn, it is extended by 7~8 times

in length by heat. At this time, the strength of the resin (film, correctly

speaking) is increased and its physical characteristic is enhanced. 3) The slit and drawn yarn (a yarn is a thread which is slit from the film and its diameter is in general 30 denier or more) is split longitudinally.

4) When the drawn yarn is exposed at the hot outside temperature

during a long time after performing a press coating and manufacturing the

finished goods, its length is reduced and contracted, thereby deteriorating

its physical characteristic and appearance. In order to prevent from these

problems, the drawn yarn is passed through a thermal plate with about

100°C. At this time, its physical characteristic is set.

5) The split yarn obtained from the above process is self-twisted in

order to enhance its appearance and strength by a twisting process. Referring to Fig. 4a, there is another characteristic according to the

present invention, that is, several slit resins of the polyolefin group resin

200 (among split yarns divided several strands) are formed by a polyolefin

group resin with high strength or a polypropylene yarn. That is, the

polyolefin group resin with high strength or the polypropylene yarn 220-1

is positioned at every 3 to 5 split yarns one by one (that is, among a

plurality of warps, one is replaced with the polyolefin group resin or the

polypropylene yarn at every 3 to 5 split yarns), thereby reinforcing the

tearing strength of the woven tarpaulin.

Also, according to the present invention, the resin is slit, then drawn

by using firstly the drawing plate and thereafter split. Next, the split yarn is secondly passed through a thermal setting plate and then the yarn having

an increased strength is twisted, thereby manufacturing the woven cloth.

At this time, when weaving the split yarn, its strength is maintained. If a

yarn is not split, it does not twisted smoothly in the twist process. Because

the split yarn can be weaved densely per unit area (the width of the thread

is about 1mm), the densely product can be weaved and then the strength of

the product is increased. That is, each split yarn can be wounded and

weaved like a multi-filament yarn. By this, a tarpaulin with high strength

can be manufactured by using a PE and the like in which the price of its

manufacturing equipment is far cheap more than that of the multi-filament

yarn.

On the other hand, the polyolefin group resin includes not only

PE(Polyethylene~High Density PE, Low Density PE) but also

EVA(Ethylene Vinyl Acetate Copolymer) and EMA(Ethyl methacrylate) and

the like. All the above materials are recyclable and harmless material

certified by FDA in U.S.A.

Also, Figs. 5a to 5c are views illustrating processes for

manufacturing a polyolefin group tarpaulin in accordance with the present

invention. When the polyolefin group woven cloth weaved by the split yarn

400 is carried with a conveyor, as shown in Fig. 5a, a melting state high temperature polyolefin group resin is stacked on an upper surface of the

polyolefin group woven cloth. Then the polyolefin group resin is passed

through a pair of rollers comprised of a cooling roller and a pressing roller

and adhered to the woven cloth in the melting state, thereby forming an

upper polyolefin group resin coating layer 420.

Next, a high temperature polyolefin group resin is stacked to a

lower side of the polyolefin group woven cloth and simultaneously the

resin supplied to the polyolefin group woven cloth is passed through a pair

of rollers constructed by a cooling roller and a pressing roller and adhered

to the woven cloth in the melting state, thereby forming a lower polyolefin

group coating layer 420'. As a result, a tarpaulin as shown in Fig. 5b is

manufactured. Both ends of the coated tarpaulin are cut and then wound to

a bobbin, so a finished product or a semi-finished product is prepared. The

above processes are first coating processes, and the polyolefin group

coating layers 420 and 420' may have a predetermined color, for example,

black color, a predetermined thickness (about 20μm to 30μm) and an effect

for intercepting heat. Especially, in case of black color, the ultraviolet is

completely intercepted.

Also, the polyolefin group coating layers 420 and 420' with the

predetermined color play several roles that the intensity of the high strength polyolefin group tape yarn or PP yarn 220-1 added as one among

the characteristics of the present invention is maintained and heat is

intercepted completely. Since the polyolefin group tape yarn or PP yarn

220-1 is weak by ultraviolet rays, in order to intercept ultraviolet rays

completely, the predetermined color coating layer, for example, the black

color coating layers 420 and 420' play an important role which maintains

the strength of the polyolefin group woven cloth. The black coating layers

420 and 420' may be formed by adding pigments to the first coating

polyolefin group resin layer. In general, ultraviolet intercepting agent is added to the resin layer,

however, in this case, since the ultraviolet intercepting agent includes oil

components, there is a problem that when coating the polyolefin group

resin to the woven cloth, both materials may not be adhered to each other

(delamination phenomenon), whereas in the present invention, since both

materials are adhered to each other by adding a constant volume of

pigment to the polyolefin group resin, not the ultraviolet rays interception

agent. So that, the coated tarpaulin has effects for intercepting heat and

protecting the polyolefin (including an HDPE) split yarn, a polyolefin group

tape yarn or a PP yarn woven cloth layer positioned inwardly from

ultraviolet rays. Especially, the PP is very weak to the ultraviolet rays and so has a good effect due to the coating layer.

Referring to Fig. 5c, in the polyolefin group tarpaulin manufactured

by the above process, the polyolefin group resin coating layer (for example,

an LDPE, but not limited that) is coated thickly, that is, a second coating

layer is formed on the outer surface of the polyolefin group resin coating

layer (generally, about 70 to 80μm or more). By this, in order to enhance

the appearance of the tarpaulin and make a product having a constant

thickness as occasion demands, a tarpaulin of a double-coating layer

structure is completed by stacking a melting polyolefin group resin on an

upper surface of the first polyolefin group resin coating layer 420 through

the above-described method, thereby forming a second polyolefin group

coating layer 440, and stacking a melting polyolefin group resin on a lower

surface of the first polyolefin group resin coating layer 420' thereby

forming a second polyolefin group coating layer 440'. In the completed polyolefin group tarpaulin, the first polyolefin

group resin coating layer with a predetermined color, for example, black

color is covered completely by the second coating layer, so that it cannot

be seen from the outside. Although in the appearance of the tarpaulin, it

has not a difference when comparing with it to the conventional tarpaulin, it

intercepts the heat applied by the melting process and ultraviolet rays completely. Also, since the coating layers are formed firstly and secondly

with a different thickness, a crater phenomenon does not occur due to the

recess portions.

The polyolefin group resin coating layer, as a characteristic of the

present invention, will be more described in detail. It is well known that it is

realistically impossible to melt polyethylene/polypropylene(PE/PP) with a

thickness of 80 to 100 μm and then coat it on a woven cloth layer. When the

melting resin having such thickness is contacted to the woven cloth (the

material of the woven cloth is the same as that of the melting resin and its

strength is more power than that of the melting resin), the strength of the

woven is deteriorated significantly due to the heat. Although it is

necessary to manufacture a product having a thickness of a constant

thickness or more, it cannot be manufactured. Accordingly, firstly, a

coating is performed by a thickness of 30 to 50μm. (And then after curing

the coating layer), by this, the first coating layer performs a heat

interception function to the heat applied when performing the second

coating. Consequently, a product having a thickness of 200μm or more can

be manufactured. At this time, a black color coating layer (pigment can be

inserted) may be formed to the inside of the first coating resin instead of

the ultraviolet rays interception agent having oil components, thereby obtaining the ultraviolet interception effect.

Also, as above, if the coating process is not divided into first and

second processes, the melted resin is inserted deeply to the recess points

crossing the yarns on the woven cloth, thereby generating a crater

phenomenon showing like a crater (like a well). However, by using the

above method of the present invention, a crater generated when

performing the first coating process is filled naturally when performing the

second coating process, thereby enhancing significantly the appearance of

the product. The second polyolefin resin coating layer (LDPE, LLDEPO inear

LDPE), EMA, EVA and soft PP and the like can be used as the raw material

of the second polyolefin resin coating layer) has an effect that various

colors can be freely added.

As the present invention may be embodied in several forms without

departing from the spirit or essential characteristics thereof, it should also

be understood that the above-described embodiments are not limited by

any of the details of the foregoing description.

INDUSTRIAL APPLICABILITY As discussed earlier, in accordance with the present invention, there is an advantage that a tearing strength can be improved significantly

compared to the conventional tarpaulin and the manufacturing method.

Further, a tarpaulin having a smooth structure removed the crater

phenomenon can be manufactured. Also, a tarpaulin having a more high strength and compact structure

can be weaved by using the yarn which is slit, then drawn, split and set by

heat. Further, a coating layer is formed in order to completely intercept

heat applied when performing the second coating layer after forming the

first coating layer and ultraviolet rays applied from the outside, thereby

increasing the strength of the tarpaulin.

Claims

WHAT IS CLAIMED IS:

1. A tarpaulin by using a polyolefin group resin which is comprised

of a polyolefin group woven cloth layer in which a polyolefin group resin is

slit, drawn and weaved and a polyolefin group resin coating layer

manufactured by stacking the polyolefin group resin on both sides of the

polyolefin group woven cloth, the tarpaulin comprising: a polyolefin group yarn for constructing the polyolefin group woven

cloth, the polyolefin group yarn slit with a predetermined width and number,

drawn by 7~8 times in length through a drawing plate, split firstly, set

secondly by heat through a setting plate, twisted and then weaved, and the polyolefin group resin coating layer including a first polyolefin

group resin coating layer coated with a predetermined thickness and color

and a second polyolefin group resin coating layer manufactured by

stacking a melting polyolefin group resin on the first polyolefin group resin

coating layer.

2. The tarpaulin of claim 1, wherein a high strength polyolefin group

resin or a polypropylene yarn is positioned at every 3 to 5 split yarns

among the plural slit polyolefin yarns resins which have a predetermine width, respectively.

3. The tarpaulin of claim 1, wherein a thickness of the second

coating layer is above twice than that of the first coating layer.

4. The tarpaulin of claim 1, wherein the first coating layer is coated

with a block color or added with a black pigment in order to intercept

ultraviolet rays

5. The tarpaulin of claim 1, wherein the first coating layer performs

a function of a heat interception layer for intercepting heat applied when

forming the second coating layer.

6. A method for manufacturing a tarpaulin by using a polyolefin

group yarn which includes steps of slitting, then drawing a polyolefin group

resin, manufacturing a polyolefin group woven cloth by weaving the slit

and drawn yarn, stacking a melting polyolefin group resin on both sides of

the polyolefin group woven cloth layer and thereby forming a polyolefin

group coating layer, the method comprising the steps of: splitting the polyolefin yarn which is slit with a predetermined width and number and firstly drawn by 7~8 times in length, setting secondly the polyolefin group split yarn by heat, twisting and weaving the split yarn maintained as a constant

temperature through the heat setting in the woven cloth forming step, forming a first polyolefin group resin coating layer with a

predetermined thickness and color on an upper and a lower surfaces of the

weaved woven cloth, and forming a second polyolefin group resin coating layer by stacking a

melting polyolefin group resin with a predetermined thickness on the

outside of the first polyolefin resin coating layer.

7. The method of claim 6, wherein a high strength polyolefin group

resin or a polypropylene yarn is positioned at every 3 to 5 split yarns

among the plural slit polyolefin yarns resins which have a predetermine

width, respectively.

8. The method of claim 6, wherein a thickness of the second coating

layer is above twice than that of the first coating layer.

9. The method of claim 6, wherein the first coating layer is coated with a block color or added with a black pigment in order to intercept

ultraviolet rays

10. The method of claim 6, wherein the first coating layer performs

a function of a heat interception layer for intercepting heat applied when

forming the second coating layer.