KR101427888B1 - The base paper of environment-friendly - Google Patents

Abstract

The present invention relates to an environmentally friendly raw paper, wherein the raw paper is characterized in that an unbleached kraft pulp sheet in which lignin components are not removed is laminated on the surface of a laminate in which a plurality of bleached kraft pulp sheets are laminated.

Description

{Base paper of environment-friendly}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a raw paper used for environmentally friendly manufacture of a disposable container.

Due to the improvement of income level, demand for products using hygienic, convenient, and highly productive disposable containers such as instant foods and packaged foods is increasing due to changes in living environment and food culture. Products using disposable containers are easier to store than glass products, and their use is increasing due to their low cost and convenient handling without washing and other procedures.

Disposable containers used in these products are generally produced by extracting pulp from wood to prepare raw paper, and coating the produced raw paper with polyethylene, which is a synthetic resin. In this case, the pulp extracted from the wood contains brownish lignin component. When the raw paper is manufactured with the lignin component contained therein, since the raw paper having a non-white brown texture is produced, The bleaching process that removes lignin components is included in the paper manufacturing process.

However, since various chemicals are used to remove the lignin component, the bleaching process is not environmentally friendly. In addition, since a complicated process is required to remove the chemical by washing with hot water or cold water several times after dehydration, the efficiency of production of the raw paper is deteriorated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an environmentally friendly base paper having a sense of beauty.

In order to achieve the above object, the present invention provides an environmentally friendly raw paper sheet characterized in that an unbleached kraft pulp sheet is laminated on the surface of a laminate in which a plurality of bleached kraft pulp sheets are laminated.

Here, the freeness of the unbleached kraft pulp sheet may be 24 to 27 ° SR (schopper riegler).

In addition, the unbleached kraft pulp sheet may have a larger amount of long fiber pulp than the short fiber pulp amount, and the long fiber pulp may be bonded side by side by beating treatment.

The unbleached kraft pulp sheet may be laminated in plurality.

The raw paper according to the present invention is characterized in that unbleached bleached kraft pulp sheets which do not remove the lignin component are laminated on the surface of a laminate in which a plurality of bleached kraft pulp sheets are laminated, It is more environmentally friendly. Therefore, when the disposable container is manufactured using the paper of the present invention, environmental pollution is small and the taste of the user can be also satisfied.

1 to 3 are reference views for explaining the environmentally friendly paper of the present invention.

Hereinafter, the present invention will be described.

The environmentally friendly raw paper according to the present invention is a laminate of unbleached kraft pulp (UKP) sheets on the surface of a laminate in which a plurality of bleached kraft pulp (BKP) sheets are laminated. In this case, the unbleached kraft pulp sheet used does not remove the lignin component. When such an unbleached kraft pulp sheet is used, the chemical bleaching process for removing the lignin component is minimized, and the paper can be produced environmentally friendly .

In addition, since the unbleached kraft pulp sheet is laminated on the surface of the laminate in which a plurality of bleached kraft pulp sheets are laminated, the environmentally friendly paper of the present invention can be used as a base paper The strength, smoothness and printability can be enhanced. Since the bleached kraft pulp sheet is thinner than the bleached kraft pulp sheet due to its high degree of control, it is difficult to secure the thickness of the paper when it is located on the surface rather than the surface, and the smoothness of the paper becomes poor.

On the other hand, a plurality of bleached kraft pulp sheets constituting a laminate in which unbleached bleached kraft pulp sheets are laminated are laminated. In this case, the number of the laminated bleached kraft pulp sheets is not particularly limited, but may be in the range of 2 to 5 It is more preferable to laminate two or three layers.

Also, the number of laminated unbaked kraft pulp sheets laminated on the surface of the laminate composed of a plurality of bleached kraft pulp sheets is not particularly limited. However, considering the beauty of the paper and printability, And it is more preferable that they are laminated with one to two. That is, the unbleached kraft pulp sheet can be laminated in one or a plurality of layers.

Accordingly, the eco-friendly paper of the present invention has a structure in which one unbleached kraft pulp sheet 20 is laminated on the surface of a laminated body 30 in which two bleached kraft pulp sheets 10 are laminated as shown in Fig. 1 Or a structure in which one unbleached kraft pulp sheet 20 is laminated on the surface of the laminate 30 in which three bleached kraft pulp sheets 10 are laminated as shown in Fig. 2, And two unbleached kraft pulp sheets 20 laminated on the surface of the laminate 30 in which two bleached kraft pulp sheets 10 are laminated.

The freeness of the unbleached kraft pulp sheet contained in the eco-friendly paper of the present invention is preferably 24 to 27 ° SR, more preferably 25 to 26 ° SR. When using a bleached kraft pulp sheet with 24 to 27 ° SR of high water solubility, it is possible to satisfy not only environment friendliness but also beautiful feeling.

Generally, the unbleached kraft pulp sheet has a degree of beacon of 28 to 30 ° SR. When the unbleached kraft pulp sheet having such a degree of beating is laminated on a bleached kraft pulp sheet to produce paper, it can be produced in an environmentally friendly manner, And the printability is deteriorated, and it is difficult to satisfy even a feeling of smoothness. Therefore, according to the present invention, unbleached kraft pulp sheet having a degree of beating adjusted to 24 to 27 DEG SR is used, thereby satisfying not only environment friendliness but also serenity.

On the other hand, the unbleached kraft pulp sheet contained in the environmentally friendly raw paper of the present invention preferably has a larger amount of long-fiber pulp than the amount of short-fiber pulp, and the long-fiber pulp is bound side by side by beating treatment. This is because when the non-bleached kraft pulp sheet in which the long-fiber pulp is side-bonded and bonded is used, the strength and strength of the paper can be increased.

The bleached kraft pulp sheets are made by bleaching unbleached kraft pulp sheets. When bleached unbleached kraft pulp sheets, the long fiber pulp contained in the unbleached kraft pulp sheet is damaged by the bleaching process and becomes monofilament pulp. At this time, when the raw paper is produced by using only the bleached kraft pulp sheet having the single fiber pulp, the degree of internal resistance is lower than that of the raw paper including the unbleached kraft pulp sheet.

However, since the present invention uses an unbleached kraft pulp sheet which is not monofilament pulped and has a high percentage of long fiber-unfolding, it is possible to provide a base paper excellent in resistance to theft. At this time, the amount of long fiber pulp contained in the unbleached kraft pulp sheet is preferably 30 to 50% by weight more than the amount of long fiber pulp contained in the bleached kraft pulp sheet. Specifically, the unbleached kraft pulp sheet may be composed of 30 to 49% by weight of short fiber pulp and 51 to 70% by weight of long fiber pulp when the short fiber pulp is composed of 100% by weight of the short fiber pulp.

In addition, in order to control the degree of beating, pulp is beating. At this time, as the long fiber pulp contained in the unbleached kraft pulp sheet is side-bundled and bonded, the bonding force between the fibers becomes high. Therefore, the present invention uses a non-bleached kraft pulp sheet having a high bonding force between fibers, so that it is possible to provide a raw paper excellent in bending strength and strength.

On the other hand, the bleached kraft pulp sheet contained in the environmentally friendly paper of the present invention is composed mainly of cellulose and / or hemicellulose, and the unbleached kraft pulp sheet is composed mainly of cellulose, hemicellulose and lignin. Specifically, the unbleached kraft pulp sheet may be composed of 30 to 40% by weight of cellulose, 30 to 40% by weight of hemicellulose, and 30 to 35% by weight of lignin based on 100% by weight of the whole sheet.

The eco-friendly paper of the present invention can be produced by a method known in the art, except that unbleached kraft pulp sheets are laminated on the surface (front or back) of the laminate in which the bleached kraft pulp sheets are laminated. At this time, the unbleached kraft pulp sheet is bonded (adhered) to the front surface or the rear surface of the laminate and laminated. It is preferable to bond (bond) the unbleached kraft pulp sheet to the back surface of the laminate for convenience of raw paper productivity. On the other hand, when the disposable container is manufactured using the environmentally friendly paper of the present invention, the unbleached kraft pulp sheet may be made to appear outside or inside the disposable container depending on the use field of the container and the user's preference.

Hereinafter, the present invention will be described in detail with reference to examples. However, these examples are for illustrating the present invention specifically, and the scope of the present invention is not limited to these examples.

[ Example ] Eco-friendly paper manufacturing

Three layers of bleached kraft pulp sheets were laminated through a known paper making process (composition, grass, and finished) to produce a laminate. One surface of the prepared laminate was laminated with a non-bleached kraft pulp sheet whose degree of beating was adjusted to 26 DEG SR through a composition process to prepare a raw paper. At this time, the degree of beating of the unbleached kraft pulp sheet can be confirmed by using a schopper riegler freeness tester known in the art.

[ Comparative Example ]

Except that four bleached kraft pulp sheets were laminated instead of the unbleached kraft pulp sheet.

[ Experimental Example ]

The physical properties of the raw paper prepared in Examples and Comparative Examples were evaluated by the following experimental methods, and the results are shown in Table 1 below.

* Experimental Method

1. Basis weight: Take a sample of more than 1m in length from the paper roll. Three pieces of 400 mm × 250 mm are cut from the collected samples, and weights are measured with electronic scales, and the basis weight is calculated by the following formula.

@ Basis weight (g / ㎡) = weight / (length × length × number of sheets) (width and length are applied in m unit)

2. Thickness: The sample taken for the above weighing measurement is measured with a thickness gauge under a certain pressure.

3. Whiteness: Prepare the sample taken for the above basis weight with a length of 250 mm and a width of 200 mm. Adjust the Hunter whiteness meter to match the reference value of the whiteness standard, and then measure the three parts with the prepared sample on (calculate with KSM 7026).

4. Smoothness: Measure the time required for 10 ml of air to pass between the glass surface and the sample surface using the sample taken for the above weighing measurement (KSM ISO 5627 - Bekk measurement method).

5. Bending strength (Stiffness): Prepare the sample taken for measurement of the basis weight by cutting 38 mm in width and 69 mm in length. One of the prepared specimens is put on the clamp of a Taber Tester and the other is fixed to the roller. After adjusting the zero point, move the switch to the left (right) to measure the scale when the pointer is set to 15 degrees. At this time, it is divided into MD (machine direction) and CD (cross-machine direction).

6. Section: Prepare the sample (width: 15mm, length: 110mm) for MD measurement. Hang the plunger of the KSM7065-MIT tester by the load corresponding to the tension required for the prepared sample and stop at that position. Press the stopwatch at the same time as the plunger of the tester starts to operate. When the sample breaks, stop the stopwatch and calculate by multiplying the measured seconds value by 3 (left and right turn of the measuring instrument = 3 times / second).

Properties Example Comparative Example Basis weight (g / ㎡) 224 219 Thickness (mm) 268 257 Laminate surface whiteness (%) 85.3 85.7 Smoothness
(Sec) surface 23 24 back side 7 16 Flexural strength (gf.cm) MD 75 63 CD 25 27 My theft (Times (1kg)) MD 1263 669 CD 570 156

As shown in Table 1, it can be seen that the embodiment corresponding to the environmentally friendly raw paper of the present invention is similar in whiteness to the comparative example, but has excellent bending strength and bending strength. This supports the fact that we can provide environmentally friendly paper with superior shod while satisfying the sense of taste.

10: bleached kraft pulp sheet
20: Unbleached kraft pulp sheet
30: laminate

Claims (6)

A non-bleached kraft pulp sheet is laminated on the surface of a laminate in which a plurality of bleached kraft pulp sheets are laminated,
Wherein the unbleached kraft pulp sheet has a freeness of 24 SIMILAR 27 DEG SR,
Wherein the unbleached kraft pulp has an amount of the long fiber pulp that is 30 to 50% by weight more than the amount of the long fiber pulp contained in the bleached kraft pulp sheet, and the long fiber pulp is bonded side by side in the high water treatment. delete The method according to claim 1,
Wherein the unbleached kraft pulp sheet has a freeness of 25 to 26 DEG SR. delete The method according to claim 1,
Wherein the unbleached kraft pulp sheet is laminated in a plurality of layers. The method according to claim 1,
Wherein said laminate is formed by laminating two to three of said bleached kraft pulp sheets.

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