KR102427339B1 - Tear resistant raschel net and method for manufacturing thereof - Google Patents

Abstract

The present invention uses a low melting point yarn (LMF) formed through complex spinning of a polyester (PET) core and a polyethylene (PE) seed (Sheath) to knit a raschel network, and twist and contact the chain and intercalation areas. By heat-sealing, chain breakage in the tension direction of the fishing net can be prevented even with the minimum thickness of netting, and the entire process from knitting net, heat treatment, and heat-sealing bonding with the rope is implemented in an in-line automation method. By doing so, it relates to a chain breakage prevention raschel net and a method of manufacturing the same to maximize the productivity of the fishing net.

Description

Chain fracture prevention raschel net and manufacturing method thereof

The present invention relates to a chain rupture prevention raschel net and a method for manufacturing the same, and more particularly, using a low melting point yarn (LMF) formed through composite spinning of a polyester (PET) core and a polyethylene (PE) seed (Sheath) Thus, it is possible to prevent chain breakage in the tension direction of the fishing net even with a minimum thickness by knitting the raschel net, and heat-sealing the twisting and contact areas of the chain and insertion threads, and also preventing the chain breakage of the fishing net in the tension direction. It relates to a chain breakage prevention raschel net and a method for manufacturing the same, which enables to maximize the productivity of a fishing net by implementing the entire process up to thermal fusion bonding in an in-line automated manner.

In general, domestic and foreign cage nets use a small net (mesh size).

There is a size according to the cultured fish species, and it is used to suit changes in the fish body according to the growth stage of fry, semi-adult fish, and adult fish. Because of this, in consideration of the extension of the fracture, a fishing net with a net size much smaller than the size of the actual fish body is used.

On the other hand, if the size of the fishing net is small, there are many nets per the same area, which eventually becomes a factor to increase the running water resistance. In addition, the adhesion of various marine organisms is increased and the durability of fishing gear is also affected.

The mesh that is mainly used as a fishing net is largely divided into a penetration type mesh and a Raschel mesh. However, the Lassel-free mesh has lower tensile strength than the penetration-type seamless mesh, so it is used by increasing the thickness of the mesh to increase the breaking strength of the Lassel-free mesh, but there is a limitation in knitting.

A through-type seamless mesh is suitable for using a thick mesh, but the knitting efficiency is low, and when the mesh is small, the manufacturing cost is high and the flow resistance of the mesh is relatively high.

Therefore, while preventing chain breakage of the fishing net, the technology is being developed to maintain the advantages of the rigid fishing net.

Korean Patent Registration No. 10-1657486

The present invention is to solve the above problems, using a low-melting point yarn (LMF) formed through a composite spinning of a polyester (PET) core and a polyethylene (PE) seed (Sheath), knitting a raschel network, and An object of the present invention is to provide a chain rupture prevention raschel net and a method for manufacturing the same to prevent chain breakage in the tension direction of the fishing net even with a minimum thickness by thermal fusion of the twist and contact area of the inserted ol.

In addition, the present invention provides an anti-chain breakage raschel net and a manufacturing method thereof that maximize the productivity of the fishing net by implementing the entire process from knitting net, heat treatment, and thermal fusion bonding with rope in an in-line automated manner. would like to provide

The method of manufacturing a chain breakage prevention raschel network according to an embodiment of the present invention is a composite spinning of a core portion made of a polyester (PET) material, and a polyethylene (PE) material that surrounds the outside of the core portion. to form a low-melting yarn (LMF), knitting a Raschel net using the low-melting yarn, and heat-treating the contact area between the looped yarn and the free yarn of the knitted Rassel net It may be characterized in that it comprises the steps of heat-sealing and heat-sealing and heat-sealing after bonding the raschel network to the rope using the low-melting yarn.

In one embodiment, when the composite spinning of the core part and the seed part, the composition ratio of the core part and the seed part constituting the low-melting yarn may be a ratio of 5:1.

In one embodiment, the step of heat-sealing by heat treatment of the contact area between the chain all (looped yarn) and the free yarn (free yarn) of the Rassel network is a first cylindrical heating roller that generates heat at a temperature between 70 degrees Celsius and 90 degrees Celsius. The first heat treatment of the Rassel network using It may be characterized in that it comprises the step of tertiary heat treatment of the Raschel network using a hot air blower that discharges the heated air.

In one embodiment, the step of heat-sealing the contact area between the chain ol (looped yarn) and the free yarn of the raschel network is to spread the mesh formed in the raschel network to a preset width after the primary heat treatment is completed. It may be characterized in that it further comprises a step of allowing the secondary heat treatment to proceed after molding.

In one embodiment, the shape of the mesh may be characterized as a rhombus and a square shape.

In one embodiment, the step of heat-treating and heat-sealing after bonding the raschel network to the rope using the low-melting yarn overlocks the raschel network and the rope using a sewing machine to which the low-melting yarn is supplied. (over lock) and after fixing the overlocked raschel net and rope in the longitudinal direction using a plurality of jigging rollers, using a hot air fan provided between the plurality of jigging rollers, between 90 and 120 degrees Celsius It may be characterized in that it comprises the step of heat-sealing and heat-sealing the overlock region between the raschel network and the rope by discharging the heated air.

According to an aspect of the present invention, by deviating the Lassel net using a low-melting yarn (LMF) formed through complex spinning of a polyester (PET) core and a polyethylene (PE) seed (Sheath), chain rupture through thermal fusion It has the advantage of being able to secure ductility by polyethylene having a relatively low modulus while preventing ductility.

In addition, according to one aspect of the present invention, it has the advantage of maximizing the productivity of the fishing net by implementing the entire process from the knitting net, heat treatment, and thermal fusion bonding with the rope in an in-line automated manner.

In particular, according to one aspect of the present invention, since it is heat-sealed using low-melting yarn in the process of connecting the net and the rope as well as the raschel net, it is possible to graft it to all fishing gear, as well as excellent abrasion resistance and strong bundle fixing power. It has the advantage of securing strong durability.

1 is a view illustrating a method of manufacturing a chain breakage prevention raschel network according to an embodiment of the present invention in a series sequence.
2 is a view showing the organizational structure and the partial network structure of the Rassel network.
3 is a view showing a cross-section of a low-melting point yarn (LMF) in which a polyester (PET) core part and a polyethylene (PE) seed part are composite spun.
FIG. 4 is a diagram illustrating in more detail a process of heat-sealing a contact region between a looped yarn and a free yarn of the Raschel network shown in FIG. 1 .
5 is a view showing in more detail the process of heat treatment and heat sealing after bonding the raschel network to the rope using the low melting point yarn shown in FIG. 1 .
Figure 6 is a view showing the process of coupling the raschel network to the rope using a sewing machine and low-melting yarn, and the combined raschel network accordingly.

Hereinafter, preferred examples are presented to help the understanding of the present invention. However, the following examples are only provided for easier understanding of the present invention, and the content of the present invention is not limited by the examples.

1 is a view illustrating a method of manufacturing a chain breakage prevention raschel network according to an embodiment of the present invention in a series sequence.

Referring to Figure 1, the manufacturing method of the chain rupture prevention raschel network according to an embodiment of the present invention is first a polyester (PET) material core portion (Core), and a polyethylene (PE) material surrounding the outside of the core portion (PE) seed ( Sheath) is compound-spun to form a low-melting yarn (LMF) (S101).

More specifically, in general, the raschel net is mainly used as a fishing net because of its small running resistance, small abrasion loss, accurate mesh size, and high knitting efficiency and low manufacturing cost. However, such a Rassel network has a disadvantage in that the tensile strength is low and chain rupture occurs during breakage. In particular, the development of the mesh is bad, the larger the mesh size, the lower the knitting efficiency, and it is difficult to manufacture a large size. The organizational structure and biased network structure of Rasselnet are as follows.

2 is a view showing the organizational structure and the partial network structure of the Rassel network.

Referring to FIG. 2( a ), in general, the tissue structure of a Raschel network is composed of a looped yarn that advances while making a chain, and a free yarn that advances in a straight line.

At this time, when one chain all and two inserts are formed, it has a tissue structure as shown in FIG. Therefore, when cutting it, the cross-sectional shape consists of 3 chain strands and 2 insertion strands.

Figure 2(c) is a portion where the nose is formed as the chains and inserts of the Rassel network are weaved together. In the present invention, it is intended to prevent chain breakage through thermal fusion by applying heat to the region where the nose is formed while these chains and inserts are intertwined with each other.

At this time, the material of the yarn constituting the chain all and the inserted all during thermal fusion is important.

3 is a view showing a cross-section of a low-melting point yarn (LMF) in which a polyester (PET) core part and a polyethylene (PE) seed part are composite spun.

Referring to FIG. 3 , the low melting fiber (LMF) shown in FIG. 3 includes a core part made of a polyester (PET) material having a melting point of 255 degrees Celsius, and a lower melting point (eg, 110 degrees to 200 degrees Celsius). etc.) is composed of a polyethylene (PE) material with a seed (Sheath) part.

When heat is applied to the composite spun core part and the seed part, the seed part having a relatively low melting point is melted while the core part is not melted and maintains its shape. These low-melting yarns correspond to eco-friendly fibers that can replace resin adhesives (epoxy resins) with excellent adhesion, uniform meltability, excellent openability, excellent shape stability, excellent elastic recovery.

At this time, in general, the seed part is hardened with adhesiveness after heat treatment, but due to the nature of the fishing net, ductility should be maintained even after heat treatment. In the heat treatment process, temperature and time must be considered, and when the seed part is completely melted, the degree of hardening is finally increased. Rather, it weakens the abrasion resistance.

Therefore, in the present invention, such a seed part is applied as a polyethylene (PE) material, and at this time, a ratio of the core part and the seed part is applied to 5:1. Polyethylene has a lower modulus than polyester and has soft properties.

At this time, if the polyethylene ratio is too high, there is a fear that unmelted residues may remain during heat treatment, and if the ratio is too low, the viscosity may be lowered and adhesion may be deteriorated.

Returning to FIG. 1 again, the Lassel net is knitted using the low-melting yarn (LMF) formed in this way (S102). As for the knitting process of the Lassel net, as shown in FIG. 2, a number of low-oil yarns are used to form a chain and an intercalation, and then, the tissue structure of the Lassel net is woven using this.

Next, the contact area (eg, the portion where the nose is formed) between the chains and the insertions of the debonded Lassels network is heat-sealed by heat-sealing (S103). This will be described in more detail with reference to FIG. 4 .

Referring to FIG. 4 , in the process of transferring the raschel net, on which the knitting is completed, in one direction using a conveyor belt, etc., heat is generated at a temperature between 70 and 90 degrees Celsius in the contact area between the chain all and the insert of the raschel net. A first heat treatment is performed on the contact area of the Lassel net using a first cylindrical heating roller (S401). At this time, the shape of the mesh formed in the Lasselnet is not taken.

Next, the second heat treatment is performed on the contact area of the Rassel network using a second cylindrical heating roller that heats the Raschel net to a temperature between 100 and 130 degrees Celsius again after the primary heat treatment is completed (S402). At this time, heat treatment is performed while spreading the mesh formed in the raschel network to both sides to a preset width.

Next, the third heat treatment is performed using a hot air blower that discharges heated air between 60 and 70 degrees Celsius of the second heat treatment of the Lassel net again (S403). In this case, the mesh is stabilized by applying hot air at a slightly lukewarm temperature compared to the secondary heat treatment.

On the other hand, during the secondary heat treatment, the shape of the mesh can be adjusted in width to a rhombus shape, and it can be molded regardless of the shape, such as a regular rhombus shape or a square shape.

Returning to FIG. 1 again, in the present invention, the raschel network and the rope are fixed to each other by bonding the raschel net to the rope and then heat-treating and heat-sealing the rope (S104). This will be described in more detail with reference to FIG. 5 .

5 is a view showing in more detail the process of heat treatment and heat sealing after bonding the Lassel net to the rope using the low melting point yarn shown in FIG. 1 .

Referring to FIG. 5, first, using a sewing machine (or sewing machine) to which a low-melting yarn (LMF) is automatically supplied, the upper portion of the raschel network and the rope are overlocked with each other. At this time, the rear end of the sewing machine is provided with means for heat-sealing by applying heat to the overlocked raschel net and rope.

Next, by discharging heated air between 90 and 120 degrees Celsius using a hot air fan provided between the plurality of jigging rollers after fixing the raschel net and the rope on which the overlock is completed in the longitudinal direction using a plurality of jigging rollers , so that the raschel net and the rope are heat-sealed to each other.

At this time, at least two or more jigging rollers may be provided, and a hot air fan is provided between the jigging rollers.

That is, as the air at a temperature of 90 to 120 degrees Celsius is discharged by the hot air blower, the low-melting yarn in the overlock region between the raschel network and the rope is finished by melting and fusion, thereby improving its own abrasion resistance and chain rupture. can also be prevented. In particular, since the bonding strength by thermal fusion is improved, the durability of the fishing gear is strengthened and the production speed can be maximized accordingly.

On the other hand, even when assembling fishing gear, such as a trawl or a wire net, having a strong netting force, it is possible to improve the binding force with the rope through the process of heat-sealing the low-melting yarn as in the present invention.

Although the above has been described with reference to the preferred embodiments of the present invention, those skilled in the art can variously modify and change the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. You will understand that you can.

Claims (7)

forming a low-melting yarn (LMF) by complex spinning a core portion made of a polyester (PET) material and a sheath portion made of a polyethylene (PE) material surrounding the outside of the core portion;
knitting a Lassel net using the low-melting yarn;
heat-sealing the contact area between the chain all (looped yarn) and the free yarn (free yarn) of the knitted Raschel network to heat-seal; and
After bonding the raschel network to the rope using the low-melting yarn, heat treatment and heat-sealing include;
The step of heat-sealing the contact area between the chain all (looped yarn) and the inserted yarn (free yarn) of the Rassel network by heat treatment,
First heat-treating the Raschel network using a first cylindrical heating roller that heats to a temperature between 70 and 90 degrees Celsius;
Secondary heat treatment of the raschel network using a second cylindrical heating roller that heats to a temperature between 100 and 130 degrees Celsius; and
Using a hot air blower that discharges heated air between 60 and 70 degrees Celsius, the third heat treatment of the Raschel net; Method for producing a chain breakage prevention Rassel net, comprising: a.
The method of claim 1,
When the composite spinning of the core part and the seed part, the composition ratio of the core part and the seed part constituting the low-melting yarn is a ratio of 5:1, the method of manufacturing a chain breakage prevention raschel network.
delete The method of claim 1,
The step of heat-sealing the contact area between the chain all (looped yarn) and the inserted yarn (free yarn) of the Rassel network by heat treatment,
After forming the mesh formed in the raschel network on which the primary heat treatment has been completed to a preset width, allowing the secondary heat treatment to proceed;
5. The method of claim 4,
The shape of the mesh is a rhombus shape or a square shape, characterized in that the chain breakage prevention method for manufacturing a raschel network.
The method of claim 1,
After bonding the raschel network to the rope using the low-melting yarn, heat treatment and heat-sealing include:
Using a sewing machine (sewing machine) to which the low-melting point yarn is supplied, overlocking the Rassel network and the rope; and
After fixing the overlocked raschel net and the rope in the longitudinal direction using a plurality of jigging rollers, the heated air between 90 and 120 degrees Celsius is discharged using a hot air fan provided between the plurality of jigging rollers. Heat treatment and heat-sealing of the overlock region between the raschel network and the rope; characterized in that it comprises a, chain breakage prevention method of manufacturing a raschel network.
Claims 1 to 2 or claim 4 to claim 6, characterized in that manufactured by any one of the manufacturing method, chain breakage prevention Lassel net.

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