KR100462185B1 - Laminated Paper for Manufacture of Bag and Kraft Lined, Synthetic Resin Woven Bag - Google Patents

Abstract

PURPOSE: A laminated paper for manufacturing bag and a kraft resin woven bag out of the same are provided to improve the endurance of the present laminated paper because the waste paper layer of the kraft paper is well boned to the synthetic resin, to reduce the production costs of paper bag, and to easily and store the contents for a long time. CONSTITUTION: The laminated paper for manufacturing bag includes: a kraft paper(6), composed of a pulp layer(2) and a waste paper layer(4) so as to configure an outer layer; a synthetic resin coating layer(8), laminated on one side of the waste paper layer(4); and a synthetic resin woven fabric layer(10), laminated on one side of the synthetic resin coating layer(8). The pulp layer(2) is made out of a raw material, like a kraft pulp; a sulfurous acid pulp; and a soda pulp; or combined with them. The waste paper layer is made out of a raw material, like a waste paper of newspaper; corrugated cardboard; and computer-related paper; or combined with them.

Description

Laminated Paper for Manufacture of Bag and Kraft Lined, Synthetic Resin Woven Bag}

The present invention consists of a knot paper (6) consisting of a pulp layer (2) and a solid paper layer (4), a synthetic resin coating layer (8) and a synthetic resin woven fabric layer (10). Kraft synthetic resin woven fabric.

"Sack" is generally used to store something. The bag used in the prior art is used to store cement, sugar, milling, feed and chemical fertilizers, the main material is made of paper made of pulp.

Pulp can be classified according to the raw materials used, the production method and the presence or absence of bleaching. The raw material classification includes wood pulp based on broad leaf tree (Laub Holz: Broadleaf Tree) such as poplar, eucalyptus, birch, or coniferous tree (Nadel Holz: Needle-leaf Tree) such as pine, fir, and larch; It is divided into non-wood pulp made from plant fiber such as straw, esparto, vargas, and bark of bark.

The classification according to the manufacturing method can be largely divided into three types, first, kraft pulp produced by the kraft method using sodium sulfide (Na ₂ S) and sodium hydroxide (NaOH) as a chemical pulp (CP) Sulphite Pulp (SP) and Sodium Hydroxide (NaOH), which are prepared by using a mixture of sulfite such as (Kraft pulp, KP), sulfite (H ₂ SO ₃ ) and Ca (H ₂ SO ₃ ) ₂ as a pharmaceutical Soda pulp (SP) manufactured using calcium carbonate (CaCO ₃ ) as a drug is representative. Second is a semi-chemical pulp (Semi-Chemical Pulp, SCP), unlike the chemical pulp is a pulp manufactured by removing a portion of hemicellulose or lignin in the wood components through light chemical treatment, and then pulverized with a refiner. The types of semichemical pulp include acid sulfite semichemical pulp (ASSC), neutral sulfite semichemical pulp (NSSC), kraft semichemical pulp (KSC) and the like depending on a slight chemical treatment. Finally, as mechanical pulp, pulp is produced by mechanically crushing logs or chips. Recently, it is produced by using pressure, heat, and some chemical treatment as a pretreatment. Therefore, most of the wood components such as hemicellulose and lignin are contained in the pulp. Types of mechanical pulp include groundwood pulp (GP or Mechanical pulp, MP), pressurized groundwood pulp (PGW), chemical mechanical pulp (Chemi-Groundwood pulp, CGP), thermodynamic pulp (Thermo Mechanical pulp, TMP) and Chemi-Thermo Mechanical pulp (CTMP).

Bleached Kraft Pulp (BKP) and Unbleached Kraft Pulp (UKP) are the types according to the bleaching of pulp. The pulp prepared by the chemical pulp manufacturing method is the hemicellulose in the wood by the chemicals used. It becomes colored by reacting with lignin. The colored material may be removed through chemicals such as chlorine, chlorine dioxide, hydrogen peroxide, and ozone to bleach the pulp.

When the paper is manufactured using the various types of pulp listed above, it is advantageous in that the bag is easily processed and recycled after use. However, due to its low durability, it is easily damaged or damaged by water or moisture. have. On the other hand, in Korea, all the pulp is imported and used, the production cost of the bag is high.

In order to alleviate the above disadvantages, "paper waste" pulp, which is paper that has not been used as a product due to the form of process scrap, etc. in the process of producing newspaper, corrugated paper and computerized paper or paper which is already used and discharged. The bag is manufactured by using a laminated paper made of paper and pulp made by mixing as described above. As a related patent document, Korean Patent Registration No. 1986-0000533 discloses a method of manufacturing high-strength kraft paper by dissociating and mixing the pulp and paper, respectively, and manufacturing the kraft paper as a multi-layer paper. In Korean Patent No. 1996-0007485, a laminate in which a synthetic resin film is inserted and laminated between kraft paper and kraft paper is disclosed.

However, when the kraft paper and the paper are stored for a long time, the contents may be deteriorated due to the penetration of moisture, and when the air flow is not smooth, an air pocket is generated, and the contents are moved or stored. Breakage of the turret may occur due to a drop impact. In addition, in the case of kraft paper containing high paper, the tensile strength and tear strength may not be suitable for bag production because the tensile strength and tear strength do not meet the standard values.

In order to solve the above problems, the present inventors manufactured a kraft paper consisting of a pulp layer and a high paper layer using pulp and paper used in the related art, and completed the lamination for bag production by allowing the kraft paper and the synthetic resin woven material to be bonded by a synthetic resin coating layer. .

The high paper layer of the kraft paper is excellent in adhesive strength with the synthetic resin can improve the durability of the bag for manufacturing the bag of the present invention, the bag manufacturing paper of the present invention is manufactured using only pulp by using a kraft paper consisting of a pulp layer and a high paper layer. It is possible to reduce the manufacturing cost of the conventional paper bag, and the bag for manufacturing the bag of the present invention has the advantage that the synthetic resin coating layer and the synthetic resin woven layer is formed inside the paper for easy storage of the contents for a long time.

Accordingly, the present invention is to provide a bag for manufacturing a bag, characterized in that consisting of kraft paper (6) consisting of a pulp layer (2) and a solid paper layer (4), a synthetic resin coating layer (8) and a synthetic resin woven fabric layer (10).

In addition, the present invention is to provide a kraft synthetic resin woven fabric consisting of the bag manufacturing paper.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view showing the laminated structure of the bag manufacturing paper of the present invention.

Figure 2 is a perspective view of a kraft synthetic resin woven fabric made of a bag for manufacturing the bag of the present invention.

<Description of the symbols for the main parts of the drawings>

2: pulp layer 4: high layer

6: kraft paper 8: synthetic resin coating layer

10: synthetic resin woven layer 12, 12 ': sewing

14: Kraft synthetic resin woven bag

The present invention provides a bag for manufacturing a bag, characterized in that consisting of a kraft paper (6) consisting of a pulp layer (2) and a paper layer (4), a synthetic resin coating layer (8) and a synthetic resin woven fabric layer (10).

"Kraft paper" as a constituent of the bag for producing bags of the present invention means a paper consisting of a pulp layer and a solid paper layer.

As a raw material of the pulp layer, pulp prepared from conifers or hardwoods may be used. Preferably, pulp prepared from conifers may be used. In addition, the pulp is classified into kraft pulp, sulfite or soda pulp according to the production method, it is preferable to use kraft pulp in the present invention.

The pulp may be used by processing through a process commonly used in the art. That is, the dissociation step of dissociating the aggregated fibers into a slurry (Slurry) by putting water and chemicals together in the pulp; And the dissociated pulp slurry sample can be used through a processing step consisting of a beating step (beater) or a refiner (Refiner) and the beating step of dispersing the aggregated fibers.

On the other hand, as a raw material of the high paper layer newspaper newspaper; Corrugated cardboard; Computerized notice; And it can be produced using a high support fee consisting of a combination of these, preferably newspaper or corrugated cardboard can be used as a high support fee.

The high support fee may be used by processing through a process commonly used in the art. That is, the dissociation step of preparing a slurry by injecting water and dissociation chemicals together into the highland; A selection step of removing foreign matter having a relatively large particle such as vinyl in the slurry sample; A defrosting step of adding caustic soda or the like to remove the ink particles printed on the waste paper existing in the selected slurry sample; And a bleaching step of adding a bleach such as hydrogen peroxide to the sample which has passed through the deinking step.

Kraft paper, which is a component of the bag-making paper of the present invention, can be produced through a conventional papermaking process. That is, the step of flowing the pulp and high support material to the paper machine, respectively, to form a ground layer consisting of a pulp layer and a high paper layer; Pressing the strata to remove moisture from the strata; And it can be produced through a papermaking process such as a drying step to completely remove the moisture for the final paper form.

The bag for manufacturing the bag of the present invention is characterized in that the kraft paper 6 and the synthetic resin woven fabric layer 10 are bonded by a synthetic resin coating layer 8.

Since the kraft paper layer is excellent in adhesive strength with synthetic resin, it is possible to improve the tensile strength, tear strength and elongation of the bag-making paper of the present invention.

In addition, the synthetic resin woven layer is a surface that is in contact with the contents during the fabrication of the bag is filled with voids by the synthetic resin coating layer can be solved the problem that water or moisture penetrates into the inside of the bag easily to deteriorate the contents to protect the contents Can be. Method for producing a synthetic resin woven fabric is typically a step of melting the synthetic resin to pull the yarn; And weaving the synthetic resin thread can be prepared in the step of forming a mesh-shaped fabric. On the other hand, the interval between the engagement of the synthetic resin woven fabric and the horizontal thread can be produced by adjusting to suit the product use at intervals of 5 to 30 mm.

On the other hand, the synthetic resin coating layer may be formed by flowing a synthetic resin melt between the high kraft paper layer and the synthetic resin woven fabric.

Synthetic resin used as a raw material of the synthetic resin woven layer and the synthetic resin coating layer polyethylene; Polypropylene; Polyester; And synthetic resin consisting of a combination thereof can be used.

In manufacturing the bag-making paper of the present invention, the method of bonding the synthetic resin woven fabric to the high paper layer of the kraft paper can be bonded by flowing a synthetic resin melt between the roller supplied with the kraft paper and the roller supplied with the synthetic resin woven. In this case, the synthetic resin melt forms a synthetic resin coating layer between the kraft paper and the synthetic resin woven fabric, so that the high paper layer of the kraft paper and the synthetic resin woven fabric can be adhered to each other. In addition, the synthetic resin coating layer fills the voids present in the synthetic resin woven material.

The bag manufacturing bag of the present invention is finally completed through a winding process. The winding step is a step of winding the bag for manufacturing the bag of the present invention in a rolled state in a rolled state in order to facilitate storage and movement of the paper. On the other hand, it is possible to improve the adhesive force of the kraft paper and the synthetic resin woven fabric by passing through the heating roller before winding the bag for manufacturing the bag of the present invention to the winding roller.

The present invention is characterized by providing a kraft synthetic resin woven fabric as the bag manufacturing paper.

The bag for manufacturing the bag of the present invention can be produced with a kraft synthetic resin woven fabric using a bag making machine commonly used in the art.

Bag for manufacturing bags according to the present invention can be manufactured according to the kraft synthetic resin woven fabric for medium and light packaging, depending on the weight of the contents, according to the finishing method of the bag sewing, capping, pinch bag (pinch bag), easy-open ( It can be manufactured in the form of an easy open or pasted valve bag.

In addition, the bag for manufacturing the bag according to the present invention can be manufactured and used as a kraft synthetic resin woven fabric for storing chemicals such as toxic substances, corrosive substances, explosive substances, flammable substances, irritants, oxidizing substances and environmentally harmful substances.

Hereinafter, with reference to the accompanying drawings will be described in detail the bag manufacturing paper and kraft synthetic resin woven fabric of the present invention.

1 is a cross-sectional view showing a laminated structure of the bag for manufacturing the bag of the present invention, Figure 2 is a perspective view of a kraft synthetic resin woven fabric made of a bag for manufacturing the bag of the present invention.

As shown in FIG. 1, the bag for manufacturing a bag according to the present invention is kraft paper 6 composed of a pulp layer 2 and a waste paper layer 4, and a stack of paper on the waste paper layer 4 of the kraft paper 6. The synthetic resin coating layer 8 and the synthetic resin woven layer 10 are formed for improving durability and protecting the contents.

As shown in FIG. 2, the kraft synthetic resin woven fabric 14 made of the bag-making paper of the present invention is a kraft paper 6 consisting of a pulp layer 2 and a solid paper layer 4, the kraft paper (6) It consists of a synthetic resin coating layer (8) and a synthetic resin woven fabric layer (10) formed on the high paper layer (4). Since the outer surface of the kraft synthetic resin woven fabric 14 is the pulp layer 2 of the kraft paper 6, the surface of the kraft synthetic resin woven fabric 14 maintains a smooth surface and can directly print graphics or text for advertisement of various products. Inside the 14, a synthetic resin woven fabric layer 10 having voids filled with the synthetic resin coating layer 8 is formed to improve the durability of the kraft synthetic resin woven fabric 14 and to block water or moisture from entering the kraft. The contents inside the synthetic woven fabric 14 are not easily altered.

The manufacture of kraft synthetic resin woven fabric 14 is a bag for manufacturing the bag of the present invention using a bag making machine to form a constant space therein, after processing the upper and lower ends in the open pocket form, and then open the upper and lower ends Or it can be produced by forming a sewing sewing portion (12, 12 ').

Hereinafter, the present invention will be described in more detail with reference to Examples. However, the following examples are illustrative of the present invention, and the content of the present invention is not limited by the examples.

<Example>

Example 1

Processing of pulp

The processing of the pulp for forming the pulp layer of the bag for manufacturing the bag of the present invention is as follows.

1,000 kg of conifer unbleached kraft pulp was mixed with water in a pulper to dissociate the pulp into a slurry. The slurry was placed in an annealer and beaten so that the degree of freedom was about 400 ml CSF (canadian standard freeness) under conditions of 1.57% concentration. The foreign material of the beating sample was removed to prepare a raw material for the pulp layer formation of the bag for manufacturing the bag of the present invention.

Example 2

Highland Processing

Processing of the waste paper for forming the waste paper layer of the bag for manufacturing the bag of the present invention is as follows.

1,000 kg of newspaper and corrugated cardboard from which foreign substances were removed were added to the pulp together with water to dissociate into slurry. The slurry was pulped for 30 minutes at a concentration of 10% in a pulper and then selected with a slit flat screen having a width of 0.15 mm to remove undissociated powder and foreign matter. To remove the ink particles in the selected sample, 1% caustic soda was added to separate the fiber and the ink, and the surfactant was added to float the ink off. Bleaching was performed by adding 2% hydrogen peroxide to the sample from which the ink was removed. Finally, the foreign material was removed from the bleached sample to prepare a raw material for the formation of high paper layer of the bag for manufacturing the bag of the present invention.

Example 3

Preparation of kraft paper consisting of pulp and solid layers

The pulp prepared in Example 1 and the high support material prepared in Example 2 were transferred to a paper machine, respectively, and the pulp and high support material were flowed to the paper machine, respectively, to form a ground layer composed of a pulp layer and a high paper layer. After compressing the strata to remove the moisture of the strata, a kraft paper consisting of the final pulp layer and the solid paper layer was prepared through a drying step for completely removing the moisture for the final paper form.

Example 4

Preparation of the bag for manufacturing bag of the present invention

In order to manufacture the bag for manufacturing the bag of the present invention, one roller was supplied so that the paper layer of the kraft paper prepared in Example 3 was an adhesive surface. The other roller was also supplied with a woven fabric made of polypropylene.

To adhere the kraft paper supplied to each roller and the woven fabric made of polypropylene, a polypropylene liquid was flowed between the kraft paper supplied roller and the woven fabric made of polypropylene. After passing through each roller, the kraft paper and the woven fabric made of polypropylene were transferred to the compression roller to prepare the final bag for manufacturing the bag of the present invention.

The bag and kraft synthetic resin woven fabric of the present invention is characterized by consisting of a kraft paper (6), a synthetic resin coating layer (8) and a synthetic resin woven fabric layer (10) consisting of a pulp layer (2) and a solid paper layer (4), The high paper layer of kraft paper can improve the durability of the bag for manufacturing the bag of the present invention by excellent adhesion to the synthetic resin, and can reduce the manufacturing cost of the conventional paper bag manufactured using only pulp, water from the outside or It is easy to keep the contents for a long time by blocking moisture.

Claims (6)

The outer layer is kraft paper 6 composed of a pulp layer 2 and a waste paper layer 4, and one side of the synthetic resin coating layer 8 and the synthetic resin coating layer 8 laminated on one side of the waste paper layer 4 of the kraft paper 6. Bag for manufacturing bags, characterized in that consisting of a synthetic resin woven layer (10) laminated on. The method of claim 1, wherein the raw material of the pulp layer is kraft pulp; Sulfurous acid pulp; A bag manufacturing bag characterized in that the pulp consisting of soda pulp and combinations thereof. The raw material of the high fat layer is newspaper; Corrugated cardboard; Computerized notice; And a high support fee made of a combination thereof. 2. The bag manufacturing paper according to claim 1, wherein the kraft paper (6) and the synthetic resin woven fabric layer (10) are bonded by a synthetic resin coating layer (8). The method of claim 1, wherein the synthetic resin is polyethylene; Polypropylene; Polyester; And a bag for producing bags characterized in that the synthetic resin made of a combination thereof. A kraft synthetic resin woven fabric made of a bag manufacturing paper according to any one of claims 1 to 5.