KR102057425B1 - Process method of packing net for reinforcing strength having biodegradable resin and packing net by this method - Google Patents

Abstract

Provided are a method for manufacturing a packing net capable of improving tensile strength through a biodegradable resin and a packing net using the same. The method for manufacturing a packing net capable of improving tensile strength through a biodegradable resin comprises the following steps of: producing poly(mono) yarn by mixing, melting and spinning polylactic acid (PLA) and polycaprolactone (PCL) which are biodegradable resins and pre-braiding a plurality of single mono-yarns produced by stretching the same at a preset stretching rate; producing a multi-stretched mono-yarn by melting and spinning poly(butylene adipate-co-terephthalate) (PBAT) which is a biodegradable resin, and multi-stretching the same; and knitting a packing net by a yarn supply part provided in a vertical direction by using the poly(mono) yarn, and a weft part provided in a horizontal direction perpendicular to the yarn supply part by using a pair of the multi-stretched mono-yarn and configured to pass to be adjacent to the yarn supply part one time while passing to be spaced apart from the yarn supply part next time. According to the present invention, a single poly(mono) yarn in which PLA and PCL are mixed and melted and a multi-stretched mono-yarn in which PBAT is melted are alternately arranged to secure mechanical properties of PLA and achieve the maximum stretching rate of PBAT, thereby manufacturing a packing net for primary harvest of agricultural products such as cabbage, onion and the like.

Description

TECHNICAL METHOD OF PACKING NET FOR REINFORCING STRENGTH HAVING BIODEGRADABLE RESIN AND PACKING NET BY THIS METHOD}

The present invention relates to a method for manufacturing a packaging network that can increase the tensile strength through the biodegradable resin and to a packaging network using the same, more specifically, in the first stretching process is sufficiently drawn and then subjected to a re-drawing process in a predetermined temperature range The present invention relates to a packaging network manufacturing method and a packaging network that can increase the tensile strength through the biodegradable resin that can be woven into a biodegradable high-strength mono yarn and a knitted structure.

General biodegradable plastics retain the same physical properties as regular plastics during use, but are completely decomposed into water and carbon dioxide by microorganisms (bacteria, fungi and algae) in nature when disposed or discarded after use. to be.

Recently, the commercialization of such biodegradable polymers and research and development on various products using the same are rapidly progressing.

Biodegradable plastics include polyhydroxy alkanoate (PHA), poly (butylene succinate) (PBS), and polybutylene adipate terephthalate (poly (butylene adipate), which are aliphatic polyester polymers. -coterephthalate); PBAT) or polybutylene succinate adipate terephthalate (poly (butylene succinate-coadipate-co-terephthalate); PBSAT), polylactic acid (PLA), polycaprolactone (PCL) Etc. can be mentioned.

Among these, PLA and PCL are excellent in biodegradability, but they are attracting attention as medical and environmentally friendly materials due to their excellent biodegradability, biocompatibility, nontoxicity of degradation products, processability, and the like.

However, a material having excellent biodegradability has a low melting point, which is weak to high temperature, and has low mechanical properties, which is not suitable for use as a primary harvesting packing network of agricultural products such as cabbage or onion.

In addition, PBAT, which is a biodegradable resin, has relatively high mechanical properties compared to PLA and PCL, but has low elongation, making it difficult to be processed into monofilament (monofilament), and it is difficult to commercialize products using the same.

The present invention has been proposed to solve the above problems, by arranging a single poly-monosa and PBAT mixed with a molten PLA and PCL cross-stretched multi-stretched mono yarns to ensure the mechanical properties of the PLA while the maximum elongation of PBAT is possible The present invention provides a packaging network manufacturing method and packaging network using the same, which can increase the tensile strength through biodegradable resins, which may enable the production of a primary harvesting packaging network of agricultural products such as cabbage or onion.

Packaging network manufacturing method that can increase the tensile strength through the biodegradable resin according to the present invention for achieving the above object, polylactic acid (PLA) and polycaprolactone (PCL) biodegradable resins Mixing melt spinning and drawing a plurality of single mono yarns produced by stretching at a predetermined elongation to produce poly mono yarns; Melting and spinning multi-stage polybutylene adipate terephthalate (poly (butylene adipate-co-terephthalate); PBAT), a biodegradable resin, to produce multi-stretched monosa; And a feeding part provided in the longitudinal direction using the polymono yarn, and a horizontal direction perpendicular to the feeding part using a pair of the multi-stretched mono yarns, but once passed close to each other in the feeding part. It may include a step of knitting to the weft part provided to pass through the spacing part spaced apart.

Producing the polymonosa, the PLA and PCL is stretched to 7 times or more after mixing and melting; And arranging and stretching the stretched single monofilaments to cross in the longitudinal direction.

Heat-setting to 50-70 ° C. after the stretching step; And after the step of weaving may further comprise the step of heat treatment at 80-100 ℃.

The producing of the multi-stretched mono yarn may include: firstly stretching the PBAT by 1.5 to 2 times; Reheating to 150 to 170 ° C. after the primary drawing and cooling; And re-stretching at an elongation of 200-300%.

After the re-stretching step may further comprise the step of rapid cooling.

In order to achieve the above object, it may include a packaging network manufactured according to the packaging network manufacturing method that can increase the tensile strength through the biodegradable resin according to the present invention.

The method for manufacturing a packaging network which can increase the tensile strength through the biodegradable resin according to the present invention, and the packaging network using the same, the mechanical properties of the PLA by arranging a single poly-monosa and PBAT mixed with multiple stretched mono-sas and mixed PLA and PCL In addition to securing physical properties, the maximum elongation of PBAT can be achieved, enabling the production of a primary harvesting packaging network for agricultural products such as cabbage and onions.

1 is a flow chart of a packaging network manufacturing method that can increase the tensile strength through the biodegradable resin according to an embodiment of the present invention.
Figure 2 is a flow chart for producing a polymonosa in a packaging network manufacturing method that can increase the tensile strength through the biodegradable resin according to an embodiment of the present invention.
Figure 3 is a flow chart for manufacturing a multi-stretched mono yarn in a packaging network manufacturing method that can increase the tensile strength through the biodegradable resin according to an embodiment of the present invention.
Figure 4 is a view schematically showing a state of knitting in the vertical weft portion and transverse weft portion in the packaging network manufacturing method that can increase the tensile strength through the biodegradable resin according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail an embodiment of a packaging network manufacturing method and a packaging network using the same can be increased tensile strength through the biodegradable resin according to the present invention. Like reference numerals in the drawings denote like elements.

1 is a flow chart of a method for manufacturing a packaging network that can increase the tensile strength through the biodegradable resin according to an embodiment of the present invention, Figure 2 is a tensile strength through the biodegradable resin according to an embodiment of the present invention can be increased Figure 3 is a flow chart for manufacturing a polymonosa in a packaging network manufacturing method, Figure 3 is a flow chart for manufacturing a multi-stretched mono-sas in a packaging network manufacturing method that can increase the tensile strength through a biodegradable resin according to an embodiment of the present invention, Figure 4 is a view schematically showing a state of knitting in the vertical weft portion and transverse weft portion in the packaging network manufacturing method that can increase the tensile strength through the biodegradable resin according to an embodiment of the present invention.

According to an embodiment of the present invention, a method for manufacturing a packaging network in which tensile strength through biodegradable resins may be increased, as shown in FIGS. 1 to 4, is polylactic acid (PLA) and polycaprolactone, which are biodegradable resins. (Polycaprolactone; PCL) by mixing melt spinning and stretching at a predetermined elongation of a plurality of single mono yarns (10) produced by the step of producing a poly mono yarn (11) (S100); Producing a multi-stretched mono yarn (20) by melt spinning and multistage stretching polybutylene adipate terephthalate (poly (butylene adipate-co-terephthalate); PBAT) which is a biodegradable resin; And a feeding part provided in the longitudinal direction using the poly mono yarn 11 and a horizontal direction perpendicular to the feeding part using a pair of the multi-stretched mono yarn 20, but once in the feeding part Next pass may include a step (S300) knitted to the weft portion is provided to pass through the spaced apart from the yarn.

The step of producing the polymonosa (S100) is mainly referred to Figure 2, the polylactic acid (Polylactic acid; PLA) and polycaprolactone (Polycaprolactone (PCL) stretched 7 times or more after mixed melt spinning Step S110; Heat-setting a single monolayer 10 at 50-70 ° C. after the stretching step (S120); Step (S130) of alternately arranging the stretched single mono yarns 10 to cross in the longitudinal direction; And heat treating at 80-100 ° C. after the step of weaving (S140).

Example

The raw material chips of polylactic acid (PLA) and polycaprolactone (PCL) may be added in a one-to-one, melt-spun and stretched manner on a known extruder (S110).

The barrel temperature during the melting and spinning process is maintained at approximately 110-130 ° C., and the extrusion die pressure can be maintained at approximately 100 psi. As such, the biodegradable resin components of polylactic acid (PLA) and polycaprolactone (PCL) are maintained by keeping the temperature relatively lower than most common melting critical temperatures and maintaining the extrusion die pressure relatively low. Heat denaturation can be prevented. In addition, when only PLA material is used, PCL was adopted as a complementary material due to high mono yarn and defect rate.

The stretching step can take place immediately after melt spinning. Thus, it can be drawn within the temperature range in the melting and spinning process. In addition, since the stretching step is performed immediately after spinning, single yarns of the biodegradable resin and the resin material can be prevented.

The total elongation at the drawing stage can be drawn at approximately seven times or more. Here, since the melt spinning temperature is drawn at a relatively low temperature (110-130 ° C.), it is possible to draw 7 times or more, and also the self-elongation of polylactic acid (PLA) and polycaprolactone (PCL) is High elongation may be possible because of its superiority.

On the other hand, the biodegradable resin material of PLA and PCL system has excellent elongation in general physical properties, but low mechanical properties, for example, due to excessive recrystallization action of PLA and PCL, brittleness may be increased and toughness may be reduced.

In this embodiment, the heat setting step may be performed to adjust the recrystallization speed (S120). The temperature range performed in the heat setting step can maintain approximately 50-70 ° C for at least 1 hour. By going through this heat setting step, it is possible to delay the spontaneous ignition of the pyrolysis or biodegradable resin due to rapid recrystallization and maintain the toughness of PLA and PCL.

Next, the envoy step may be performed (S130).

The step of encapsulation may be performed by staggering a pair of elongated single monofilaments 10 alternately and longitudinally alternately as shown in FIG. 4. In the encapsulation process, the single mono yarn 10 may be naturally lowered to room temperature, and a pair of single mono yarns 10 may be spun in a pretzel to be a poly mono yarn 11.

Next, a heat treatment step may be performed (S140).

The heat treatment step may be a heat treatment at approximately 80-100 ℃. By performing this heat treatment step, the stabilization of each particle of the polymonosa 11 can be performed, the empty voids or defects in the process of weaving can be removed, and the single monolithic yarn 10 is produced in the process of Warping stresses and non-uniform bending may naturally stabilize.

Hereinafter, the tensile strength of the polymono yarn according to the embodiment of the present invention and the comparative examples of the present invention described above look at.

Comparative Example 1

Only polylactic acid (PLA) was melt spun to an extruder to draw a single mono yarn 10 or more than 7 times, and the above-described heat setting, plying and heat treatment were performed.

Comparative Example 2

Polylactic acid (PLA) and polycaprolactone (PCL) were melt spun in one-to-one and drawn 2-3 times, followed by heat setting, weaving and heat treatment.

Comparative Example 3

Polylactic acid (PLA) and polycaprolactone (PCL) were melt spun and stretched 7 times or more, then heat setting was omitted, and the plywood and heat treatment processes were sequentially performed.

Comparative Example 4

Polylactic acid (PLA) and polycaprolactone (Polycaprolactone (PCL)) were melt-spun and stretched 7 times or more in a one-to-one manner, followed by heat treatment after omission of the plywood process.

All of the comparative examples were performed in the same manner except for the change in the conditions mentioned above, and at least 9 repeated experiments were performed for each condition. The diameter of the output polymonosan 11 was about 0.32 mm on average (in Comparative Example 2). Case about 0.37 mm, and in Comparative Example 4 about 0.14 mm).

Referring to Table 1, it can be seen that the tensile strength of the polymono yarn according to the embodiment of the present invention is much higher than that of the polymono yarn according to the comparative examples of the present invention.

On the other hand, PLA or PCL biodegradable resin has a problem in that the elongation is excellent but structural rigidity is not secured. In this embodiment, the multi-stretched mono yarn 20 is produced to contribute to the knitting structure.

The step of producing the multi-stretched mono yarn (20) is mainly shown in Figure 3, the first step of 1.5 ~ 2 times the primary after melt spinning the PBAT (S210); The first stretching and reheating to 150 ~ 170 ℃ after cooling (S220); Re-stretching at an elongation of 200-300% (S230); And rapid cooling after the re-stretching step (S240).

First, the step of melt spinning the PBAT and then the primary stretching to 1.5 ~ 2 times can be performed (S210).

The barrel temperature in the melting and spinning process is maintained at approximately 170-210 ° C., unlike the polymono sand 11 production step described above, and the extrusion die pressure can be maintained at approximately 150 psi.

Due to the temperature difference in the melting and spinning process, the temperature range of the primary drawing step can be maintained at a relatively high temperature range. In the first stretching step, the stretching may be about 1.5 to 2 times.

Next, a reheating step may be performed after the cooling process (S220).

The temperature range in the reheating step can be reheated to 150-170 ° C. Through this, brittleness reduction and toughness due to the recrystallization action can be increased.

Thereafter, re-stretching may be performed at an elongation of 200 to 300% (S230).

Thereafter, a rapid cooling step may be performed (S240).

The rapid cooling step can be a temperature change from approximately 100 ° C. to 23-25 ° C. in a few minutes or tens of minutes. By undergoing such a rapid cooling process, recrystallization recovery is blocked to prevent single yarns and brittle recovery springback phenomenon.

Hereinafter, the tensile strength of the multi-stretched mono yarn according to the embodiment of the present invention and the multi-stretched mono yarn according to the comparative example of the present invention are compared and examined.

Comparative Example 5

All of the above process conditions were the same, and the multi-stretched mono yarn 20 was produced with the rapid cooling step omitted.

Defect check was performed using SEM.

Referring to Table 2, the tensile strength of the multi-stretched mono yarn according to an embodiment of the present invention is higher than the multi-stretched mono yarn according to Comparative Example 5 of the present invention, the elongation and tensile strength is high, and defects such as defects do not occur Able to know.

Next, the yarn feeding portion provided in the longitudinal direction using the polymono yarn 11 and a pair of the multi-stretched mono yarn 20 is provided in a horizontal direction perpendicular to the yarn feeding portion, but once the yarn feeding portion Next, the step of being knitted close to each other and the next weaving is provided so as to pass apart from the yarn portion may be performed (S300).

Mainly referring to Figure 4, the yarn feeding portion is provided in the longitudinal direction, it may be provided using the polymono yarn (11). Polymonosa 11 produced in the steps as described above is a biodegradable resin, especially PLA material is contained 50 pro, even though excellent biodegradability, mechanical properties can be secured. It is able to withstand the external forces in the longitudinal direction of the wrapping net, in particular the tensile force. For example, when agricultural products such as onions or cabbages in the transverse direction as shown in Figure 4 can fully perform the function of the packaging network.

The weft thread may be provided in a horizontal direction perpendicular to the yarn feeder, but may pass through the yarn feeder so as to pass close to each other and the next pass through the yarn feeder.

Weft portion may be provided using a multi-stretched mono yarn (20). The weft part has a relatively low elongation compared to the steep part, but has excellent mechanical properties, so that the packing net can be arranged to support the load of agricultural products when manufactured with the packing net.

That is, there is an advantage that the mechanical properties, especially the tensile strength of the yarns can be improved by knitting the weft yarns arranged at regular intervals in the yarns.

As such, the PLA and PCL are mixed and melted with a single polymonosa (11) and PBAT by arranging the multi-stretched mono-sa to secure the mechanical properties of the PLA while the maximum elongation of the PBAT can be possible to produce agricultural products such as cabbage or onion It may be possible to manufacture a primary harvesting packaging network.

As mentioned above, although this invention was demonstrated in detail using the preferable embodiment, the scope of the present invention is not limited to a specific embodiment, Comprising: It should be interpreted by the attached Claim. In addition, those skilled in the art should understand that many modifications and variations are possible without departing from the scope of the present invention.

10: mono mono yarn 11: poly mono yarn
20: Multi-stretched mono yarn

Claims (6)

Producing polymonosa by mixing and melting polylactic acid (PLA) and polycaprolactone (PCL), which are biodegradable resins, and plural single monofibers produced by stretching at a predetermined elongation. ;
Melting and spinning multi-stage polybutylene adipate terephthalate (poly (butylene adipate-co-terephthalate); PBAT), a biodegradable resin, to produce multi-stretched monosa; And
The yarn feeding part provided in the longitudinal direction using the polymono yarn and a pair of the multi-stretched mono yarns are provided in a horizontal direction perpendicular to the yarn feeding part, but once passed through the yarn part in close proximity to each other. The method of manufacturing a packaging network that can increase the tensile strength through the biodegradable resin, characterized in that it comprises a step of weaving the weft part is provided to pass apart from the yarn. The method of claim 1,
Producing the polymonosa,
Stretching the polylactic acid (PLA) 7 times or more immediately after melt spinning; And
A method of manufacturing a packaging network in which the tensile strength through the biodegradable resin, characterized in that it comprises the step of staggering and crossing the stretched single mono yarn in the longitudinal direction. The method of claim 2,
Heat-setting to 50-70 ° C. after the stretching step; And
After the step of weaving a packaging network manufacturing method that can increase the tensile strength through the biodegradable resin, characterized in that it further comprises the step of heat treatment at 80-100 ℃. The method of claim 2,
Producing the multi-stretched monosa,
Firstly stretching the PBAT by 1.5 to 2 times after melt spinning;
Reheating to 150 to 170 ° C. after the primary drawing and cooling; And
10. A method for manufacturing a packaging network which can increase the tensile strength through biodegradable resins, comprising the step of re-stretching at an elongation of 200-300%. The method of claim 4, wherein
Method for producing a packaging network that can increase the tensile strength through the biodegradable resin further comprising the step of rapid cooling after the re-stretching step. Packaging network manufactured by the manufacturing method according to any one of claims 1 to 5.

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