KR101110423B1 - Method of and apparatus for manufacturing paper coated with pla - Google Patents

Abstract

PURPOSE: A manufacturing method of a PLA coating paper is provided to coating pure PLA on paper without using an adhesive, by pressurizing the molten PLA resin film of 115-120 °C on raw paper, which is heated to 90-94 °C, with the pressure of 55-65 kgf/cm^2. CONSTITUTION: A manufacturing method of a PLA coating paper comprises: a step of first heating a raw paper by hot air to 30-35°C; a step of second heating the raw paper by hot air to 50-60°C; a step of third heating the raw paper by contacting with the roller of 180-220°C; a step of fourth heating the raw paper by contacting with the roller of 210-230°C; a step of fifth heating the raw paper to 90-94°C by contacting the roller of 220-240°C; and a step of stacking the molten PLA resin film(R) of 115-120°C on the raw paper by pressurizing with the pressure of 55-65 kgf/cm^2.

Description

Method and apparatus for manufacturing PLA coated paper {Method of and Apparatus for manufacturing paper coated with PLA}

The present invention relates to a paper manufacturing method and manufacturing apparatus, and more particularly to a PLA coated paper manufacturing method and manufacturing apparatus.

Unlike synthetic plastics, PLA (Poly Lactic Acid) is characterized by biodegradation under a natural environment that meets certain composting conditions. PLA is an environmentally friendly ingredient that can replace PE coated on paper cups in various situations in which various products have been released and used in real life due to the development of injection, extrusion, or molding technology, and internationally restrict the use of disposable products. However, PLA has a disadvantage in that it is not easy to coat on paper, which is one of the most useful materials in real life because of a slow solidification rate of polymer and a weak physical property.

The United States Patent No. 6,183,814 and the Republic of Korea Patent Registration No. 10-875104 proposed as a way to improve the disadvantages of PLA disclose a melt coating method and composition of the PLA resin, respectively. The above-mentioned US patent 6,183,814 was filed on May 22, 1998 (International Application No. PCT / US1998 / 10385) and subsequently filed on November 23, 1999, Republic of Korea (Korean Patent Application No. 1999-7010885).

The U. S. Patent 6,183, 814 has a disadvantage in that the PLA is not preferably implemented on a white board because there is a disadvantage in that the PLA is less extensible and very hard to thermally decompose due to low thermal stability. In addition, in the case of Patent Registration No. 10-875104 is not a pure PLA coating by mixing polyester, polyester urethane, etc. in polylactic acid, there is a problem that is difficult to apply to the production because a detailed coating method is not presented substantially.

On the other hand, in order to improve such a problem, the applicant has disclosed a "PLA film laminating apparatus and method thereof" (hereinafter, Patent Application 1) and Patent Application No. 10-2009- in Patent Application No. 10-2009-0082806 (2009.09.03) 0093801 (2009.10.01) filed for "PLA cup paper manufacturing method, PLA cup paper produced by the method and PLA paper cup using the same" (hereinafter patent application 2).

However, as a result of the application to the manufacturing apparatus, Patent Application 1 describes that the adhesive may not be used at all, but in practice, laminating is almost impossible without the adhesive, and if the adhesive is used, it is contaminated with the laminated cross section. Can be replaced by

In addition, although the patent application 2 relates to a manufacturing method for instantaneous fusion and coating of paper and PLA film, it was very difficult to apply practically instantaneous fusion of PLA film on a general paper as in US Patent 6,183,814.

It is an object of the present invention to provide a PLA coated paper manufacturing method and apparatus which can coat pure PLA on paper without adhesive.

In order to achieve the above object, PLA coated paper manufacturing method according to an embodiment of the present invention is a paper base heated to 90 ~ 94 ℃, 55 ~ 65 kgf / ㎠ a molten PLA resin film of a temperature of 115 ~ 120 ℃ It is prepared by pressing at a pressure of.

In addition, the PLA coated paper manufacturing method according to another embodiment of the present invention comprises the steps of indirectly heating the paper paper continuously supplied to the temperature of 50 ~ 60 ℃ by hot air; Directly heating the indirectly heated paper base paper to a temperature of 90 to 94 ° C. in contact with a roller having a temperature of 180 to 240 ° C .; And laminating the molten PLA resin film having a temperature of 115 to 120 ° C. at a pressure of 55 to 65 kgf / cm 2 on a paper base heated to 90 to 94 ° C ..

Here, the step of indirectly heating, the step of indirectly primary heating so that the paper paper continuously fed to the temperature of 30 ~ 35 ℃ by hot air; And indirectly heating the first heated paper base paper to a temperature of 50 to 60 ° C. by hot air, and the directly heating step includes performing the second heated paper base paper 180 ~. Tertiary heating in contact with a roller at a temperature of 200 ° C .; Performing a fourth heating by contacting the third heated paper base paper with a roller having a temperature of 210 ° C. to 230 ° C .; And heating the fourth base paper to the temperature of 90 to 94 ° C. in contact with the roller having a temperature of 220 to 240 ° C ..

In addition, the PLA coated paper manufacturing apparatus according to an embodiment of the present invention is a paper feed roll for continuously supplying paper paper; A primary paper heater disposed in the rear of the paper feed roll and indirectly primary heating the paper paper supplied by the paper feed roll to a temperature of 30 to 35 ° C. by hot air; A secondary paper heating unit disposed behind the primary paper heating unit and indirectly secondary heating the paper base heated by the primary paper heating unit to a temperature of 50 to 60 ° C. by hot air; A tertiary heating roller unit disposed at the rear of the secondary paper heating unit and tertiarily heating the paper base paper secondary heated by the secondary paper heating unit in contact with a roller having a temperature of 180 to 200 ° C .; A fourth heating roller unit disposed at the rear of the third heating roller unit to fourthly heat the paper base heated by the third heating roller unit in contact with the roller having a temperature of 210 to 230 ° C .; 5th heat which is disposed behind the 4th heating roller part and heats 5 times so that the paper base heated 4th by the 4th heating roller part may contact with the roller of 220-240 degreeC, and will be 90-94 degreeC temperature. Heating roller unit; A molten resin discharge part disposed at a rear side of the fifth heating roller part to freely drop the molten PLA resin film at a temperature of 115 to 120 ° C; The molten PLA resin film having a temperature of 115 to 120 ° C. at a pressure of 55 to 65 kgf / cm 2 was disposed below the molten resin discharge part and heated to 90 to 94 ° C. by a pair of pressure rollers. Pressing roller unit for pressing and laminating; And a winding roller unit located at the rear of the pressure roller unit to wind the laminated PLA coated paper.

Here, 85-95 degreeC hot air can be used for the said primary paper heating part.

In addition, the said secondary paper heating part can use hot air of 95-105 degreeC.

Further, the pressure roller portion, the temperature of the pressure roller may be a temperature of 60 ~ 70 ℃.

In addition, the winding roller portion, the temperature of the roller may be 15 ~ 25 ° C.

Further, between the primary paper heater and the secondary paper heater, a diffusion fan that blows to one surface of the paper base to evenly spread the temperature of the paper primary heated by the primary paper heater. It may be further provided.

According to the PLA coated paper manufacturing method and manufacturing apparatus according to an embodiment of the present invention,

First, since the molten PLA resin film having a temperature of 115-120 ° C. is pressurized to a pressure of 55-65 kgf / cm 2 on paper base heated to 90-94 ° C., pure PLA can be coated on paper base without adhesive. .

Second, the paper base paper is indirectly heated by hot air to evenly raise the temperature of the paper base paper, and can also remove the moisture of the paper base paper.

Third, the indirectly heated paper stock can be in direct contact with the heated roller so that the paper stock is at a temperature of 90-94 ° C., which is a good temperature for coating.

Fourth, the diffusion fan can be provided to evenly spread the temperature of the paper base paper first heated by the primary paper heating unit.

1 is a flow chart showing a PLA coated paper manufacturing method according to an embodiment of the present invention.
Figure 2 is a conceptual diagram showing a PLA coated paper manufacturing apparatus according to an embodiment of the present invention.
3 to 11 are photographs showing in detail the respective parts of the PLA coated paper manufacturing apparatus shown in FIG.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that, in the drawings, the same components are denoted by the same reference symbols as possible. In addition, detailed descriptions of well-known functions and configurations that may blur the gist of the present invention will be omitted. For the same reason, some of the components in the drawings are exaggerated, omitted, or schematically illustrated.

First, the PLA coated paper manufacturing method according to an embodiment of the present invention is prepared by pressing a paper base heated to 90 ~ 94 ℃, and a molten PLA resin film of 115 ~ 120 ℃ temperature at a pressure of 55 ~ 65 kgf / ㎠ do. Herein, the thickness of the PLA resin film may be about 30 μm.

The PLA coated paper manufacturing method will be described in more detail as follows. 1 is a flow chart showing a PLA coated paper manufacturing method according to an embodiment of the present invention.

Referring to Figure 1, the PLA coated paper manufacturing method includes step S100 to step S300.

In step S100, the paper base paper continuously supplied is heated indirectly to rise to a temperature of 50 to 60 ° C by hot air. Paper stock cannot suddenly increase to the desired temperature due to the nature of the material. Therefore, in order to raise the temperature of the paper stock above 90 ° C., the temperature of the paper stock should be evenly increased by indirect heating, and the moisture of the paper stock should be removed.

At this time, step S100 includes step S110 and step S120 in detail. In step S110, the paper base paper continuously supplied is indirectly primary heated to rise to a temperature of 30 to 35 ° C by hot air. Then, in step S120, the first heated paper base is secondarily indirectly heated to a temperature of 50 to 60 ° C by hot air.

Next, in step S200, the indirectly heated paper base paper is directly heated to a temperature of 90 to 94 ° C by contacting a roller having a temperature of 180 to 240 ° C. That is, since in step S100 by raising the temperature to 50 ~ 60 ℃ by indirect heating to remove moisture, in step S200 is directly heated to a temperature of 90 ~ 94 ℃ in direct contact with the heated roller. When the temperature of the paper base paper is too high, deformation may occur, and when it is too low, problems may occur in the molten PLA resin film (R) and adhesive force, and it is preferable that the paper is heated to about 90 to 94 ° C.

At this time, step S200 includes steps S210 to S230 in detail. In step S210, the secondary heated paper base is heated in contact with a roller having a temperature of 180 to 200 ° C. for third heating. Then, in step S220, the third heated paper base paper is heated in a fourth manner in contact with a roller having a temperature of 210 to 230 ° C. In step S230, the fourth heated paper base paper is heated 5 times to be in contact with a roller having a temperature of 220 to 240 ° C. to a temperature of 90 to 94 ° C.

Finally, in step S300, the molten PLA resin film having a temperature of 115 to 120 ° C. is pressurized to a pressure of 55 to 65 kgf / cm 2 on the paper base heated to 90 to 94 ° C., and laminated.

Hereinafter, a PLA coated paper manufacturing apparatus for implementing the PLA coated paper manufacturing method will be described. 2 is a conceptual view showing a PLA coated paper manufacturing apparatus according to an embodiment of the present invention, Figures 3 to 11 is a photograph showing in detail the respective parts of the PLA coated paper manufacturing apparatus shown in FIG.

2 to 11, the PLA coated paper manufacturing apparatus is a paper feed roll 110, the primary paper heating unit 120, the secondary paper heating unit 130, the tertiary heating roller unit 140, 4 Primary heating roller portion 150, fifth heating roller portion 160. The molten resin discharge part 170, the pressure roller part 180, and the winding roller part 190 are included.

First, the paper feed roll 110 continuously supplies the paper paper P1 (see FIG. 3).

As described above, in order to evenly raise the temperature of the paper stock and to remove the moisture of the paper stock, the paper stock must be indirectly heated. For this purpose, the primary paper heating unit 120 and the secondary paper heating unit 130 are provided.

The primary paper heating unit 120 is indirectly disposed behind the paper feed roll 110 to indirectly raise the paper paper P supplied by the paper feed roll 110 to a temperature of 30 to 35 ° C. by hot air. First heat. Here, the primary paper heating unit 120 may use a hot air of 85 ~ 95 ℃ (see Fig. 4, 5).

The secondary paper heating unit 130 is disposed at the rear of the primary paper heating unit 120 to heat the paper base paper P2 primarily heated by the primary paper heating unit 120 at a temperature of 50 to 60 ° C. Indirectly secondary heating to rise to temperature (see FIG. 6). Here, the secondary paper heating unit 130 may use a hot air of 95 ~ 105 ℃. The secondary paper heating unit 130 may heat the opposite side of the paper base paper P2 heated by the primary paper heating unit 120, or may heat the same side.

At this time, between the primary paper heating unit 120 and the secondary paper heating unit 130, in order to evenly spread the temperature of the paper base paper P2 firstly heated by the primary paper heating unit 120 ( P2) may be provided with a diffusion fan 200 for blowing on one surface (see Fig. 5). In addition, an intake facility S may be provided between the secondary paper heating unit 130 and the tertiary heating roller unit 140 to remove foreign substances such as dust (see FIG. 7).

Next, the third heating roller portion 140 and the fourth heating roller portion 150 to directly heat up to a temperature of 50 ~ 60 ℃ by indirect heating to remove the moisture to a temperature of 90 ~ 94 ℃ And the fifth heating roller 160 is provided.

The tertiary heating roller unit 140 is disposed behind the secondary paper heating unit 130 and rollers of the paper base paper P3 secondary heated by the secondary paper heating unit 130 at a temperature of 180 to 200 ° C. 3rd heating in contact with.

The fourth heating roller unit 150 is disposed behind the third heating roller unit 140 and in contact with the roller of the temperature of 210 ~ 230 ℃ the paper base heated by the tertiary heating roller unit 140 tertiary 4th heating (see FIG. 7).

An expansion roller E may be provided between the fourth heating roller unit 150 and the fifth heating roller unit 160 to apply a tensile force to the paper base.

The fifth heating roller unit 160 is disposed behind the fourth heating roller unit 150 to contact the roller of the paper heated fourth by the fourth heating roller unit 150 at a temperature of 220 to 240 ° C. 5th heating to a temperature of 90 ~ 94 ℃ (see Figure 8).

On the other hand, the molten resin discharge unit 170 is disposed behind the fifth heating roller unit 160 to freely drop the molten PLA resin film (R) at a temperature of 115 ~ 120 ℃ (see Fig. 8, 9).

The molten resin discharge unit 170 melts the spherical granular PLA raw material and supplies the molten PLA resin film R through a thin gap. PLA must remain molten when in contact with the paper stock to naturally stack on the paper stock. If the temperature of the molten PLA resin film (R) is too high, it is difficult to be laminated due to oxidation, and if it is too low, the temperature of the molten PLA resin film (R) should be 115-120 ° C. do.

The pressure roller unit 180 is disposed below the molten resin discharge unit 170 and is a molten PLA resin film having a temperature of 115 to 120 ° C. on a paper base heated at 90 to 94 ° C. by a pair of pressure rollers (R). ) Is laminated by pressing at a pressure of 55 ~ 65 kgf / ㎠ (see Figure 9). Here, the pressure roller unit 180 is advantageous in lamination that the temperature of the pressure roller is a temperature of 60 ~ 70 ℃ and the molten PLA resin film (R) is not adhered to the pressure roller. That is, the PLA resin film (R) by the pressure between the pressure roller unit 180 is forced into the fiber of the paper base paper to improve the adhesive force.

On the other hand, between the fifth heating roller 160 and the molten resin discharge unit 170 may be further provided with a separate pressure roller (C). The temperature of the pressure roller here may also be 60 ~ 70 ℃.

Finally, the winding roller unit 190 is located behind the pressure roller unit 180 to wind up the laminated PLA coated paper (CP) (see Fig. 11). The winding roller section 190 is advantageous in cooling that the temperature of the roller is 15 ~ 25 ℃.

For reference, a tension roller T may be further provided between the pressure roller 180 and the winding roller 190. The tension roller T pulls the laminated PLA coated paper CP with a tensile force of about 103 to 109 kgf in order to stretch the laminated PLA coated paper CP (see FIG. 10).

On the other hand, the embodiments of the present invention disclosed in the specification and drawings are merely presented specific examples to easily explain the technical contents of the present invention and help the understanding of the present invention, and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention can be carried out in addition to the embodiments disclosed herein.

110 ... paper feed roll 120 ... 1st paper heating part
130 ... 2nd paper heating part 140 ... 3rd heating roller part
150 ... 4th heating roller section 160 ... 5th heating roller section
170.Melting resin discharge part 180 ... Pressure roller part
190.Reel Roller

Claims (9)

delete Indirectly heating the paper paper continuously fed to a temperature of 50 to 60 ° C. by hot air;
Directly heating the indirectly heated paper base paper to a temperature of 90 to 94 ° C. in contact with a roller having a temperature of 180 to 240 ° C .; And
The PLA coated paper manufacturing method comprising the step of laminating by pressing the molten PLA resin film having a temperature of 115 ~ 120 ℃ at a pressure of 55 ~ 65 kgf / ㎠ on a paper base heated to 90 ~ 94 ℃. The method according to claim 2,
The indirectly heating step,
Indirectly heating the paper base paper continuously fed to a temperature of 30 to 35 ° C. by hot air; And indirectly heating the paper initially heated to a temperature of 50 ° C. to 60 ° C. by hot air.
The direct heating step,
Tertiarily heating the second heated paper base paper by contacting a roller having a temperature of 180 to 200 ° C; Performing a fourth heating by contacting the third heated paper base paper with a roller having a temperature of 210 ° C. to 230 ° C .; And heating the fourth base paper to a temperature of 90 to 94 ° C. in contact with a roller having a temperature of 220 to 240 ° C., wherein the fourth step is heated to a PLA coated paper. A paper feed roll for continuously feeding paper stock;
A primary paper heater disposed in the rear of the paper feed roll and indirectly primary heating the paper paper supplied by the paper feed roll to a temperature of 30 to 35 ° C. by hot air;
A secondary paper heating unit disposed behind the primary paper heating unit and indirectly secondary heating the paper base heated by the primary paper heating unit to a temperature of 50 to 60 ° C. by hot air;
A tertiary heating roller unit disposed at the rear of the secondary paper heating unit and tertiarily heating the paper base paper secondary heated by the secondary paper heating unit in contact with a roller having a temperature of 180 ° C. to 200 ° C .;
A fourth heating roller unit disposed at the rear of the third heating roller unit to fourthly heat the paper base heated by the third heating roller unit in contact with the roller having a temperature of 210 to 230 ° C .;
5th heat which is disposed behind the 4th heating roller part and heats 5 times so that the paper base heated 4th by the 4th heating roller part may come in contact with the roller of 220-240 degreeC, and will be 90-94 degreeC temperature. Heating roller unit;
A molten resin discharge part disposed at a rear side of the fifth heating roller part to freely drop the molten PLA resin film at a temperature of 115 to 120 ° C;
The molten PLA resin film having a temperature of 115 to 120 ° C. at a pressure of 55 to 65 kgf / cm 2 was disposed below the molten resin discharge part and heated to 90 to 94 ° C. by a pair of pressure rollers. Pressing roller unit for pressing and laminating; And
PLA coating paper manufacturing apparatus comprising a winding roller unit for winding the laminated PLA coated paper located in the rear of the pressure roller. The method of claim 4,
The primary paper heating unit,
PLA coated paper manufacturing apparatus characterized by using hot air of 85 ~ 95 ℃. The method of claim 4,
The secondary paper heating unit,
PLA coated paper manufacturing apparatus characterized by using hot air of 95 ~ 105 ℃. The method of claim 4,
The pressing roller portion,
PLA coating paper manufacturing apparatus, characterized in that the temperature of the pressure roller is a temperature of 60 ~ 70 ℃. The method of claim 4,
The winding roller portion,
PLA coating paper manufacturing apparatus, characterized in that the temperature of the roller is 15 ~ 25 ℃. The method of claim 4,
Between the primary paper heating section and the secondary paper heating section,
PLA coating paper manufacturing apparatus characterized in that it further comprises a diffusion fan for blowing on one side of the paper base paper in order to evenly spread the temperature of the paper base paper first heated by the primary paper heating unit.

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