KR101334639B1 - Biodegradable wrap cutting knife how attach - Google Patents

Abstract

The present invention relates to a poly lactic acid (PLA) material biodegradable wrap cutting knife manufacturing method and a PLA material biodegradable wrap cutting knife adhesion method capable of ultrasonic fuse to a box for wrap storage. The purpose of the present invention is to increase the recycling efficiency of the box for wrap storage by improving the problem of fragile PLA materials and substituting a steel wrap cutting knife which is impossible to be reused with an environment-friendly biodegradable PLA material wrap knife. The present invention comprises: a first step for conducting the reactive extrusion of malic acid, one kind selected from PBS, PBAT, PBSA and PCL and a biodegradable material at a screw temperature of 150-190; a second step for compounding an elastic PBS-based material and PLA material, which are manufactured in the first step, and extruding the PBS-based material and PLA material into a resin; a third step for manufacturing a sheet for preparing the PLA wrap cutting knife by using the resin manufactured in the second step in an extruder which maintains two compression skill polishing rolls of 30-50 and the screw temperature of 150-190; and a fourth step for cutting the sheet into a wrap cutting knife shape with a crenellation.

Description

Biodegradable wrap cutting knife how attach}

The present invention relates to a method for attaching a biodegradable wrap cutting knife of PLA (Poly Lactic Acid) material capable of ultrasonic welding to a box for lapping storage, and in particular, improves the brittle and fragile problem in PLA material, and thus was not recyclable. ) The wrap cutting knife can be replaced with an eco-friendly biodegradable PLA material to improve the recycling efficiency of the wrap storage box.

Cutter knives attached to the wrap storage box used in the prior art have been mostly made of steel or general synthetic resin and used to adhere to the wrap storage box with an adhesive.

Due to many environmental changes and environmental disasters, CO2 reduction policies are becoming mandatory for society, but products made of steel or synthetic resins have many problems in recycling packaging boxes. That is, since the work to separate the box and the lap cutting knife must be accompanied when recycling, a lot of manpower and the resulting cost has been an obstacle to the recycling of the lap storage box. In addition, even if the attached cutter knife is removed, the adhesive applied for the attachment is a barrier to the recycling of the box.

In order to improve these problems, there was a plan to utilize eco-friendly plant-derived PLA (Poly Lactic Acid) material, but PLA material was brittle and fragile, so it could not be used as a lap cutting knife in saw blade shape. That is, the lap cutting knife should be basically equipped with a certain strength and hardness, there was a limit to the physical properties that can not perform the function of the lap cutting knife.

In addition, it should be easy to adhere the wrap cutting knife to the wrap storage box, PLA material has a problem that the peeling phenomenon occurs over time with the aromatic polyester-based adhesive which is a synthetic resin adhesive due to the characteristics of the aliphatic polyester.

Ultrasonic fusion method can be used to improve this, which causes the phenomenon of cracking of PLA material during welding or weak adhesion strength.

The present invention improves this conventional problem to improve the CO2 reduction and box recycling utilization method of producing a PLA wrap cutting knife suitable for ultrasonic welding without adhesive and the wrap cutting knife prepared in this way to the wrap storage box It is an object of the present invention to provide a method of integrally attaching through ultrasonic welding.

In particular, the lapping cutting knife adheres to the paper box in the shape of saw blades when the lap storage box and the ultrasonic fusion are adhered to the paper box, and there is no peeling phenomenon. To have a lap cutting knife.

In addition, an object of the present invention is to enable a wrap cutting knife adhered to the wrap storage box by ultrasonic welding to maintain a strong attachment state for a long time by reinforcing the adhesive force by mechanical coupling.

According to an aspect of the present invention,

First step of reaction extrusion of biodegradable material and screw temperature at 100 ℃ ~ 160 ℃ to malic acid and one selected from PBS, PBAT, PBSA and PCL,

A second step of compounding the elastomer-implemented PBS-based material and the PLA material manufactured in the first step, and extruding the resin into a resin;

A third step of preparing the sheet for preparing the PLA wrap cutting knife in an extruder in which the resin prepared in the second step is maintained at a screw temperature of 150 ° C. to 190 ° C. and two pressing skill processing rolls at 50 ° C. to 30 ° C .;

A fourth step of manufacturing a wrap cutting knife for cutting the sheet paper into a wrap cutting knife shape having a saw blade shape;

A fifth step of ultrasonically welding the wrap storage box and the lap cutting knife while maintaining the temperature of the jig in contact with the wrap storage box at 90 ° C. to 100 ° C .;

Is achieved by configuration.

The PLA wrap cutting knives, in order to satisfy the strength and hardness required for brittle and brittle PLA sheet paper due to the PLA characteristics, the melting point of the PLA material at 155 ℃ to form two melting point phases to be reinforced It is manufactured by compounding with PBS, PBAT, and PCL-based biodegradable materials.

The melting point of the PBS system is mostly 100 ℃ ~ 120 ℃ is known a lot of PLA composite plastic manufacturing method in the past, but most tend to have been developed to crystallize PLA material and reinforce the saddle strength and impact strength, the present invention is PLA material In order to implement compatibility with the PBS-based material in the selected one, the reaction is extruded and reacted with the PBS-based malic acid (malic acid) as a cross-linking agent is prepared by compounding with the PLA material. Malic acid is an acidulant and has a melting point of 127 ℃, which improves brittle characteristics in the production of PLA sheets due to the characteristics of the elastomer during the first reaction extrusion with PBS system. It improves little characteristics and enables crosslinking with PBS.

In other words, the pure PLA sheet is difficult to use due to the peeling phenomenon even when broken or ultrasonic fusion when ultrasonic welding, the present invention, the cutting cutter knives PBS-based at the time of ultrasonic welding to achieve a complete melting point to strengthen the adhesive strength and storage box wrap Can be. In other words, if the PLA material is less than 55 ℃ temperature is less than the glass transition temperature (Tg) and the adhesive strength of the paper is weakened, but the glass transition temperature of PBS is minus 32 ℃ can act as an adhesive during ultrasonic welding.

Since the wrap cutting knife of the present invention includes a resin having a low melting point in the biodegradable resin, ultrasonic waves (high frequency or heat) may be used in a state in which the wrap cutting knife is in close contact with the box for storing the wrap even after it is molded, cooled, and stabilized in a mold. When the low melting point of another resin contained in the biodegradable resin is dissolved and attached to the box surface, it is possible to effectively overcome the difficulty of box fusion of paper material, which was not performed with the conventional biodegradable resin. Therefore, there is an advantage that can solve the problems such as environmental destruction, waste of resources caused by the disposal of the metal lap cutting blade, there is an advantage that can reduce the cost for recycling the lap storage box.

In addition, the wrap cutting knife of the present invention made of a biodegradable resin is attached to the storage box by the ultrasonic wave, high frequency, heat fusion, etc. and at the same time as the bonding protrusions are bonded to the bonding hole formed in the paper, so that the firm adhesion It has the advantage of keeping the state for a long time.

1 is a cross-sectional view showing the main portion of the present invention, a method for attaching a wrap cutting knife to a wrap storage box.
Figure 2 is a process of attaching the present invention the cutting knife to the wrap storage box.
Figure 3 is an exploded perspective view showing a biodegradable resin cutting knife coupling structure according to the present invention.
Figure 4 is an exploded perspective view of the main portion showing a state in which the present invention biodegradable resin wrap cutting knife is in the fixing hole of the box.
Figure 5, Figure 6 is a cross-sectional view showing a state in which the present invention biodegradable resin wrap cutting knife coupled to the wrap box.

1 is a cross-sectional view of the main portion showing a method for attaching a wrap cutting knife to the wrap storage box of the present invention, Figure 2 is a process diagram for attaching the wrap cutting knife of the present invention to the wrap storage box.

Preparation of the present invention cutting knife is as shown in Figure 1 to 2,

First step of reaction extrusion of biodegradable material and screw temperature at 100 ℃ ~ 160 ℃ to malic acid and one selected from PBS, PBAT, PBSA and PCL,

A second step of compounding the elastomer-implemented PBS-based material and the PLA material manufactured in the first step, and extruding the resin into a resin;

A third step of preparing the sheet for preparing the PLA wrap cutting knife in an extruder in which the resin prepared in the second step is maintained at a screw temperature of 150 ° C. to 190 ° C. and two pressing skill processing rolls at 50 ° C. to 30 ° C .;

A fourth step of manufacturing a wrap cutting knife for cutting the sheet paper into a wrap cutting knife shape having a saw blade shape;

A fifth step of ultrasonically welding the wrap storage box and the lap cutting knife while maintaining the temperature of the jig in contact with the wrap storage box at 90 ° C. to 100 ° C .; .

The malic acid in the first step serves to reinforce the strength of the PLA material and PLA material and the selected one PBS-based crosslinking agent. At this time, the malic acid used has a melting point of 127 ° C to 132 ° C and a PH of 2.43. Mailic acid dehumidified and dried under a water content of 200 ppm or less in consideration of the hydrolysis and pyrolysis when reacting with PBS. Use The proportion of malic acid and one PBS material selected from PBS, PBAT, PBSA, and PCL is 1 wt% to 2 wt% and 98 wt% to 99 wt%.

At this time, the extruder used is a twin extruder reaction discharge temperature is as follows.

T1 T2 T3 H D Remarks Temperature 100 ℃ 120 DEG C 130 ℃ 150 ℃ 160 ° C

In addition, PLA material is weak compatibility with other materials may be broken when the saw blade shape after the production of sheet paper or vibration due to ultrasonic welding. In order to improve this, the problem may be improved by reacting and extruding one selected from PBS, PBSA, PBAT, and PCL and malic acid, and compounding it with a PLA material to prepare a sheet. In the first step, 1% by weight to 2% by weight of malic acid and 98% to 99% by weight of the selected PBS-based material are extruded at a temperature of 100 ° C to 160 ° C. At this time, if the malic acid content is less than 1%, the crosslinking property of PLA material and PBS material is weak and the elasticity effect is insufficient, and the cutting knife may be broken. If the malic acid is 2% or more, PBS, system and malic acid (malic acid) weakens the crosslinked phase due to unreacted substances.

85% by weight to 90% by weight of the PLA material of the second step and 10-15% by weight of the first step material is extruded at a temperature of 150 ℃ ~ 190 ℃ and then resinized around 4mm. If the content of the first stage material is less than 10%, the PBS-based (melting point 100 ℃ ~ 120 ℃) when the ultrasonic welding is insufficient and may be peeled off due to lack of adhesive function with paper.

In the case of PLA material, melting point of 155 ℃, PBS system having low melting point according to the instantaneous temperature at the time of ultrasonic welding can act as an adhesive.

When the first stage material content is more than 15%, the adhesive strength is improved, but the lap cutting knife is softened, which may cause bending or cutting ability when cutting the lap.

100% PLA PLA90% Stage 1 10% 85% PLA
Tier 2 15% Remarks Tensile Modulus 4430 4210 3860

-Sheet Paper Thickness: 200㎛

-Test method: ksm 3006: 2003

100% PLA PLA90% Stage 1 10% 85% PLA
Tier 2 15% Remarks Hardness 85 78 66

-Sheet Paper Thickness: 200㎛

-Test method: ksm iso868: 2006

The lapping cutting knife may have a certain hardness as shown in Tables 2 and 3 to perform the cutting function of the wrap. In the third stage sheet manufacturing, the screw temperature is 150 ° C to 190, similar to the general sheet extrusion method, but the temperature of the two pressing steel processing rolls should be 50 ° C or less.

If the temperature of the polishing roll is less than 35 ℃ may be a problem in the smoothness of the sheet due to the instantaneous curing in the PLA characteristics. When the temperature of the polishing roll is 50 ° C. or more, the viscosity of the PLA may be attached to the polishing roll or accelerated to some hardening rate, so that the tip of the saw tooth may be broken when cutting the wrap cutting knife to the saw blade shape. Production methods and speeds are also possible in the usual way.

In the third step, sheet paper for cutting cutting knife is produced and sheet paper is 0.2mm thick. At this time, the extruder temperature for producing sheet paper used is the same as the second step temperature and the temperature of the two steel (Steel) polishing rolls to be 50 ℃ or less to prepare the PLA sheet paper to be amorphous. When the temperature is over 50 ° C. on the polishing roll, sheet paper may stick to the roll, and crystallized and broken when cutting the wrap cutting knife in a saw blade shape. PLA sheet paper should be cut with a saw blade-shaped knife to cut the wrap well.

At this time, the size of PLA sheet for wrap cutting is generally 10mm (width) and the length can be changed depending on the size of the box for storing the wrap, but it is cut to 200mm ~ 300mm and the size of the saw blade is cut into triangle shape of 3mm height and 2mm on the bottom.

The ultrasonic welding step of the fifth step is a step of ultrasonic welding with the saw-shaped wrap cutting knife and the lap storage box manufactured in the fourth step as shown in Figure 1, the ultrasonic welding machine is composed of a jig and a horn and used The frequency is applied to 220V 60Hz power through the power supply 18,000Hz ~ 20,000Hz to change the vibration energy and then adjust the amplitude with the booster. If it is less than 18,000 Hz, the adhesive strength of the sheet paper may be weakened. If the sheet sheet is more than 20,000 Hz, the sheet may melt and adhere to the vibrator. In order to make PLA fusion cutting knife and paper ultrasonic fusion on the saw blade shape during ultrasonic welding, the temperature of paper closing jig should be 90 ℃ ~ 100 ℃ for better adhesion and no peeling phenomenon.

The wrap storage box used at this time uses a paper box without PE or PP film coating after printing. Printing ink is printed using eco-friendly soybean oil ink, and paper box is manufactured without adhesive by folding box manufacturing method on both sides. The method of making double-sided finishing paper boxes without adhesives is generally known, and soybean oil printing is also known as an environmentally friendly printing method.

Ultrasonic welding is a method of bonding paper and PLA cutting knife using materials on two melting points manufactured in the second step without adhesives such as jig, horn (vibrator) and frequency. At this time, the jig size is larger than the paper box size and the temperature sensor is attached to the jig, and then the temperature heating device of the jig is used to strengthen the adhesive force. The frequency of the ultrasonic welding machine is 18,000 Hz-20.000 Hz. As described above, the temperature of the jig is performed at 90 ° C. to 100 ° C., but if the temperature of the jig is 90 ° C. or lower, the adhesive force is weakened, and the lapping box and the lapping cutting knife may be peeled off. 155 ℃) material can stick to the horn (vibrator). Of course, by adjusting the frequency in the ultrasonic welding machine can be fused to the paper wrap storage box 10 and the wrap cutting knife PLA material has a problem that the crystallization progressed between 55 ℃ ~ 110 ℃ can be broken. If the frequency of the ultrasonic welding machine is more than 20,000Hz, there is a problem that the melting of the instantaneous temperature rise on the edge of the ultrasonic wave or crystallized PLA material can be broken. In addition, the ultrasonic application time is 0.2 seconds before taking into account the adhesive force, the melting point of the sheet and the phenomenon attached to the vibrator.

The present invention is a box for ultrasonically fused PLA wrap without environmentally friendly and compostable conditions (temperature 60 ℃, humidity 80%, activated microorganisms) and product manufacturing and synthetic resin adhesive and PE or PP film coating that can be circulated naturally. The integrated product is completed.

Figure 3 is an exploded perspective view showing a biodegradable resin cutting knife coupling structure according to the present invention, Figure 4 is a partial separation perspective view showing a state in which the present invention biodegradable resin wrap cutting knife in the fixing hole of the box, Figure 5, Figure 6 is a cross-sectional view showing a state in which the present biodegradable resin wrap cutting knife is bonded to the wrap box.

Meanwhile, as illustrated in FIGS. 3 to 6, a wrap cutting knife 20 is attached to an upper end of an opening side of the wrap storage box in which the roll-type wrap is contained. The lap cutting knife 20 is configured to be cut by the tooth 22 when the upper end is in the shape of the tooth 22 and pulled toward the upper end of the lap cutting knife 20 in the unfolded state.

The wrap cutting knife 20 is made of a biodegradable resin as described above and firmly attached to the wrap by ultrasonic (high frequency, heat fusion) fusion method. This is because the resin contained in the wrap cutting knife 20 is melted and fused to the paper to ensure sufficient adhesion strength when attached, it can minimize the defect rate of the product by adding a structural adhesion reinforcement.

To this end, one or a plurality of predetermined distance coupling holes 12 are formed at the end of the opening of the wrap storage box 10 to which the wrap cutting knife 20 is attached, and the bonding surface of the wrap cutting knife 20 corresponding thereto is coupled. A coupling protrusion 24 is formed to be coupled to the ball 12. The coupling protrusion 24 has a structure in which one end thereof is bent in the direction opposite to the teeth 22. The bent coupling protrusion 24 is molded by injection molding, and is simply composed of a fixed mold and a movable mold to simplify the mold and improve the productivity of the product. In order to simplify the mold, the shape of the product is recessed into the portion where the coupling protrusions 24 are to be formed in the thickness of the wrap storage box 10, and the opposite side portions of the teeth 22 and the opposite sides of the opposite side portions protruded and recessed. By cutting the coupling protrusion 24 is configured.

When the coupling of the cutting knife 20 is pushed into the coupling hole 24, the coupling protrusion 24 and then moved in the bending direction of the coupling protrusion 24, the wrap storage box 10 to the incision of the coupling protrusion 24 Is fitted and fixed, and is prevented from being separated from the wrap storage box 10 by the coupling protrusion 24. Of course, if the separation in the reverse direction is easily separated, but if the lap is pressed in the saw tooth in the process of cutting the lap the pressure until the cutting coincides with the direction in which the engaging protrusion 24 is coupled to the lap storage box 10 Therefore, since the force acting in the opposite direction other than the normal lap cutting pressure does not occur, the lap cutting knife 20 can maintain a firm attachment state for a long time.

In particular, the cutting pressure is transmitted by the coupling protrusion 24 even when the lap is unfolded on the lap cutting knife 20 to cut the structure so that the movement of the lap cutting knife 20 is structurally inhibited. It will not affect the deterioration of adhesion.

In order to further improve this effect, forming a locking jaw 26 to which the upper end of the lap storage box 10 is caught on the upper side of the lap cutting knife 20 in contact with the lap storage box 10 may further improve the bonding force. There is a number.

10-Wrap Storage Box 12-Joiner
20-Lap Cutting Knife 22-Tooth
24-engaging projection 26-hanging jaw
30-Jig 40-Oscillator

Claims (5)

A first step of reacting and extruding the biodegradable material and the screw temperature at a temperature of 100 ° C. to 160 ° C. to malic acid and one selected from PBS, PBAT, PBSA, and PCL;
A second step of compounding the elastomer-implemented PBS-based material and the PLA material manufactured in the first step, and extruding the resin into a resin;
A third step of manufacturing the sheet for preparing PLA cutting knife in an extruder in which the resin prepared in the second step is maintained at a screw temperature of 150 ° C. to 190 ° C. and two pressing skill processing rolls at 50 ° C. to 30 ° C .;
A fourth step of manufacturing a wrap cutting knife for cutting the sheet paper into a wrap cutting knife shape having a saw blade shape;
A fifth step of ultrasonically fusion of the lap storage box and the lap cutting knife while maintaining the temperature of the jig in contact with the lap storage box at 90 ° C. to 100 ° C .; A method for attaching a biodegradable wrap cutting knife capable of ultrasonic welding to a wrap storage box, comprising: According to claim 1, wherein the malic acid (Malic acid), which serves to strengthen the strength of the PLA material and the PLA material and the selected PBS-based crosslinking agent in the first step has a melting point of 127 ℃ ~ 132 ℃, PH Is 2.43, considering the possibility of hydrolysis and pyrolysis when reacting with PBS system, it uses mailic acid dehumidified under water content of 200ppm or less, 1% to 2% by weight of malic acid and PBS A method of attaching a biodegradable wrap cutting knife capable of ultrasonic welding to a lab storage box, characterized in that primary reaction extrusion is performed by mixing 98 wt% to 99 wt% of one selected PBS-based material selected from PBAT, PBSA, and PCL. According to claim 1, Forming one or a plurality of coupling holes 12 at the end of the opening of the wrap storage box 10,
On the adhesive surface of the wrap cutting knife 20 corresponding to the coupling hole 12 to form a coupling protrusion 24 coupled to the coupling hole 12,
The coupling protrusion 24 is a biodegradable wrap cutting knife attachment method that is capable of ultrasonic welding to the wrap storage box, characterized in that one end is bent in the opposite direction of the teeth (22). According to claim 1, Lap storage box characterized in that the locking jaw 26 is formed on the upper end of the lap storage box 10 on the upper side of the lap cutting knife 20 in contact with the lap storage box 10 formed. A method for attaching a biodegradable wrap cutting knife to ultrasonic welding. delete

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