KR950006534B1 - Method of producing paper-vessel - Google Patents

Abstract

The disposable paper vessel was produced by 3 steps; (1) a pulp slurry such as a chemical pulp, a mechanical pulp or a pretreated waste paper, a reinforcing resin such as an emulsion type vinylacetate resin or an urea resin and an antiseptics such as a sorbic acid of a potassium sorbitate are stirred with water in the tank to give a slurry, (2) a wet felt is produced from the slurry at 600-740 mm Hg by a felting mold, and (3) the wet felt is dried not exceeding 8% moisture at 90-120 degree C and sterilezed by an ultraviolet.

Description

Manufacturing method of disposable paper machine

The present invention relates to a manufacturing method of disposable paper machine, more specifically, a synthetic resin system having a lot of problems in waste disposal as a substitute for a disposable container (1) pulp slurry made of structural fibers, reinforcing resin and preservative Preparing a slurry by mixing with water and then mixing the mixture with water in a tank equipped with a stirrer, (2) preparing a wet felt with the slurry at 600 to 740 mmHg vacuum with a felt mold, and (3) the wet felt. It relates to a method of manufacturing a disposable paper machine manufactured by passing through a UV sterilizer after drying to less than 8% moisture content.

Disposable disposable paper of the present invention is a container for containing food that does not have much water (moisture) among the containers frequently used by people in daily life, and is a disposable container mainly used in restaurants.

The main raw material of the conventional disposable container is expanded polystyrene (Polystyrene Foam) or expanded polyethylene (Polyethylene Foam, PE) by injection or extrusion molding the resin to make a disposable container of various shapes. The advantage of the bowl made of the resin for the foam was light, low thermal conductivity, low absorption, good shock absorption. These advantages are good to use as a disposable container, but the resin has a great pollution problem in terms of environment, such as the smoke is very large, does not decompose itself when left in nature.

Therefore, the object of the present invention does not bring any environmental pollution because it is decomposed by itself when left in nature in the disposal of disposable containers inevitably generated after use in daily life, the discarded paper can be reused in paper-related business The present invention also provides a method of manufacturing a disposable paper machine that can be used as a fertilizer (compost).

Still another object of the present invention is to provide a very economical disposable paper machine that can use waste papers such as waste paper boxes, which are abundant in daily life, as a main raw material.

In order to achieve the above object, in the present invention (1) a pulp slurry made of structural fibers, a reinforcing resin and a preservative are introduced into a tank equipped with a stirrer and mixed with water to prepare a sludge, (2 ) Manufacturing a wet felt with the slurry in a 600 ~ 740 mmHg vacuum with a felting mold, (3) drying the wet felt to 8% or less of moisture, and then passing the ultraviolet sterilizer to prepare disposable paper. It was.

The present invention will be described in more detail as follows.

In the present invention, structural fibers, reinforcing resins, preservatives are the main raw materials, and colorants are used if necessary. The present invention relates to a method for producing a disposable paper with a slurry composed of the main raw materials, the basic composition is shown in Table 1 below.

TABLE 1

(1) structural fibers

Structural fibers constituting the skeleton of the disposable paper machine of the present invention is mainly used for the chemical pulp (CP) kraft pulp (Craft pulp) and semi-chemical pulp (Semi-Chemical pulp, SCP), mechanical pulp (Mechanical Pulp, Ground Wood (MP) and Refiner Groundwood Pulp (RPG) are also used. Various types of pulp may be used as the structural fiber according to the working conditions of the felt forming process.

In addition, waste paper is used as a structural fiber, which is mainly used for wrapping paper or paper board composed of the same type of pulp as described above, but in order to change the paper physically or chemically, Do not use converted paper that is secondary processed on original paper.

When the waste paper is used as a raw material, it can be used alone when there is no problem in the forming process of the wet felt, but it is almost 85 to 97% by weight of the total composition by mixing with the above-described chemical and mechanical pulp. . When the content of the structural fiber is less than 85% by weight of the natural fiber is difficult to decompose if left in nature, the pollution problem, and if it exceeds 97% by weight due to the structural fragility of the container is difficult to manufacture and handle.

In addition, before the waste paper is used as a raw material, it is essentially passed through a pretreatment process such as removing foreign matters.

First, make a slurry by releasing waste paper in water from a pulper, which is a metal tank with a stirrer attached to the bottom or side, and then remove coarse and large foreign substances first by passing through a continuous screen. After passing through a centrifugal cleaner, fine and heavy foreign substances such as metal pieces and sand are removed and used as structural raw materials.

(2) resin for reinforcement

The reinforcing resin has the purpose of adhering the fiber particles between the fiber particles of the structural fibers of the disposable paper machine, and the resin is used as water-soluble resin in an amount of 3 to 15% by weight based on the total composition as the emulsion vinyl acetate resin and the urea resin. . The mixing ratio of the two resins is a ratio of vinyl acetate resin to urea resin of 1: 0.3 to 2.5, and as the mixed resin evaporates water, particles of resins dispersed in the disposable paper stick together with the pulp to form a transparent film. When this is cured, the adhesive force is exerted. As a result, the body of the pulp fiber is firmly solidified and has heat resistance as well as water resistance due to urethane resin.

If the content of the reinforcing resin is less than 3% by weight, there is a problem of inferior reinforcement. If the content of the reinforcing resin exceeds 15% by weight, it is difficult to decompose when left in nature and cannot be reused. If the ratio is less than 1: 0.3, the water resistance decreases. If the ratio exceeds 1: 2.5, the reinforcement is weak.

(3) preservative

Since the disposable branch of the present invention is used as a container in people's diet, sorbic acid (2, used in foods) to suppress the development of bacteria that are harmless to the human body such as bacteria, yeast and aerobic bacteria in the container during storage or use. 4-Hexadienoic acid, C ₆ H ₈ O ₂ ) or potassium sorbate (Potassium 2,4-hexadienolate, C ₆ H ₇ EN ₂ ) to ensure that the content of the final container product is 0.1-0.5% by weight of the dry weight of the structural oil. . Since the preservative has a strong anti-development effect than the bactericidal effect on harmful bacteria, harmful bacteria grow when less than 0.1% by weight, and when it exceeds 0.5% by weight, there is a problem that is harmful to the human body in case of using a tableware.

(4) colorant

Pulp used as raw material is brown unbleached pulp, so when using colorant, reddish brown or brown food colorant Anato water soluble is used. Since the wastewater from the manufacturing process of the felt becomes pigmented, many difficulties are involved in treating the wastewater, and therefore, a colorant should not be used. It is preferable to use the said coloring agent at 0.5 weight% of structural fiber manufactured by Samyoung Chemical of Japan, Jeil Chemical.

Hereinafter, a method of manufacturing a disposable paper machine will be described.

As mentioned above, the manufacturing process of the felt molding method is mainly made by manufacturing disposable paper machine containing the ingredient of the present invention and containing foods with little moisture or oil.

First, the pulp or the pretreated waste paper, which is the main raw material, is made into a pulp slurry having 3 to 8% solids with water in the pulp, and then the pulp slurry is composed of one fixed blade and another blade rotating. A refiner is used to change the shape of the pulp particles by crushing, cutting, and fibrillating the fibrous particles of the pulp dispersed in the pulp slurry. The result of the change in the shape of these pulp particles is TAPPI. This can be confirmed by the T 1002-Drainage Time of Pulp test of TEST METHODS, which is directly related to the moulding state of the wet felt and the surface condition of the final product in the next process, the felting process.

The drainage time of the pulp slurry suitable for preparing the disposable paper of the present invention is 5.5 to 18 seconds. In the case where the drainage time is 18 seconds or more, it takes a long time to form the wet felt in the felting process, and since there are many particles of fine short fibers in the pulp, it is difficult to handle the wet felt easily. If the drainage time is 5.5 seconds or less, the wet felt is irregularly formed in the felting process, and the surface of the final product is rough.

Next, as a slurry manufacturing process of the present invention, the prepared pulp slurry is transferred to a slurry production tank with a stirring device, and then a preservative and a reinforcing resin mixture are added to prepare a slurry. It will be described in detail below how to add a preservative and reinforcing resin.

Since sorbic acid, which is a preservative, is not dissolved in water, 1% by weight of sorbic acid is added to 100 parts by weight of ethanol (Ethyl alcohol) to dissolve. Then, the sorbic acid-alcohol solution is used by using a flexible rubber tube of 1/2 inch to 1 inch. Slowly inject into the slurry being stirred. In the case of using potassium sorbate, 1 part by weight of potassium sorbate is added to 100 parts by weight of water, followed by dissolving, followed by pouring into a stirred slurry. In this case, potassium sorbate is used in a larger amount than the basic composition shown in Table 1 because it is dissolved and discharged in the wastewater generated in the felting process.

Next, the resin for reinforcing was diluted in 50 parts of water in 1 part of each resin, and then the emulsion vinyl acetate resin and urea resin were poured into the slurry being stirred first, followed by stirring the slurry for 0.5 to 2 hours. After advancing, the urea resin dilution liquid is inject | poured secondary, and stirring of a slurry is continued for 30 minutes or more.

Next, as the final step of slurry production, water is injected into the slurry in which the pulp, the preservative, and the reinforcing resin are mixed so that the concentration of the solid content in the slurry is 0.4 to 1.5%. When the concentration of the solid content is 0.4% or less, a large amount of waste water is generated and too much time is taken during the felting operation. When the concentration of the solid content is 1.5% or more, the shape and structure of the wet felt are unevenly formed so that the surface is rough in the final product. There was a problem.

The following is a felting process for forming a wet felt. This process uses a felting process of the same shape as a container to be made and a vacuum of 600 to 740 mmHg to adsorb the solids of the slurry layer onto the felting mold and the gold mesh surface to form the slurry. Prepare wet felt. In the process, the moisture content of the wet felt is about 55-65%, and the wet felt is immediately moved to a continuous tunnel dryer (dry tunnel dryer) to dry the water contained in the felt to 8% or less. The temperature of the dryer is to be maintained at 55 ~ 85 ℃.

In the next process, in order to smoothly shape the surface of the disposable container, the surface of the container containing the food is smoothly formed by pressing the dried felt using a pneumatic press of a specially manufactured pressing die. . Here, the compression mold is composed of a female mold and a male mold, and the female mold is fixed to the bottom of the press, and the male mold is fixed to a side of the press and the upper vertical movement attached to the electric heater. This male mold has the purpose of smoothing the surface of the container. It is preferable that the temperature of a male mold is 90-120 degreeC, and a crimping pressure shall be 8-35 kg / cm <2>.

The next step is the final step of the manufacturing process, in order to make the disposable paper machine prepared according to the present invention suitable for the use of the container containing food, the compressed container is passed through a continuous UV sterilizer and immediately placed in a synthetic resin container and vacuumed. Pack it.

Where the surface of the container is used for purposes that do not have to be smooth, for example, disposable paper used for dry foods, such as hamburgers and toast, which are almost dry, skip the drying and crimping of the finished felt and go straight through the UV sterilizer. Pack it.

Where the surface of the container is used for purposes that do not need to be smooth, disposable paper used for dry foods, such as hamburgers and toast, for example, which is dried, skips the drying and the complete pressing process and is packaged directly through an ultraviolet sterilizer. do.

The following examples illustrate the invention in more detail and do not limit the scope of the invention.

Example 1

First, a pulp slurry having 5% solids with water in the pulp is prepared from 90% by weight of pulp or pretreated waste paper, which is the main raw material, and the pulp slurry is dispersed in the pulp slurry using a refiner. The formation of pulp particles was changed by crushing, cutting, and fibrillating fibrous particles of. The drainage time of the pulp slurry was 12 seconds. Next, the slurry production tank to which the stirring device was attached was gradually injected into the slurry being stirred using the above-described flexible pulp slurry tube. Next, 4% by weight of an emulsion of vinyl acetate resin was diluted in 200% by weight of water and injected into the slurry, and stirred for 1 hour, followed by diluting and injecting 6% by weight of urea resin in 200% by weight of water, followed by stirring of the slurry for at least 30 minutes. Continued.

Water was injected into the prepared slurry so that the concentration of solids in the slurry was 1.0%, and the solids of the slurry layer were transferred to the solids of the slurry layer by using a felting process having the same shape as the vessel to be manufactured and a vacuum of 650 mmHg. It was adsorbed on the surface to prepare a wet felt from the slurry. The wet felt was immediately transferred to a continuous tunnel dryer (dry tunnel dryer) to dry the water contained in the felt to 8% or less while maintaining the temperature of the dryer to 70 ℃. Immediately thereafter, the package was passed through an ultraviolet sterilizer to prepare disposable paper.

Example 2

Using the same materials and contents as in Example 1, the wet felt prepared through the same process was dried. Thereafter, the dried felt is squeezed, where the crimping mold consists of a female mold and a male mold, the female mold is fixed to the bottom of the press, and the male mold is attached to an electronic heater to attach the upper portion of the press. It fixed to the side which moves up and down. The temperature of the male mold was 100 ℃, the pressing pressure was 25kg / ㎠.

As a final step, the compressed container was vacuum packed by passing through a continuous UV sterilizer and immediately placed in a synthetic resin container.

The disposable paper produced by the manufacturing method of the present invention is made of pulp, which is more than 90% of its composition, and when it is left in nature, it is decomposed and extinguished itself when left in nature. There is no advantage at all and the recycling of waste containers is also possible.

Claims (11)

(1) a pulp slurry made of structural fibers, a reinforcing resin, and a preservative are introduced into a tank equipped with a stirrer and mixed together with water to prepare a slurry; (2) 600 to 740 mmHg vacuum in a felt mold. (3) manufacturing the wet felt with the slurry; and drying the wet felt with water content of 8% or less and passing through an ultraviolet sterilizer. The method of claim 1, wherein the structural fiber is a chemical pulp, mechanical pulp and pretreated waste paper using 85 to 97% by weight of the total composition. The method of claim 1, wherein the discharge time of the pulp slurry is 5.5 to 18 seconds. The method of claim 1, wherein the reinforcing resin is an emulsion vinyl acetate resin and a urea resin, which are diluted in 50 parts of water per one part of each resin and mixed in order. The method of claim 1, wherein the reinforcing resin is mixed with 3-15 wt% of the vinyl acetate resin and the urea resin, based on the total composition. The method for producing a disposable resin according to claim 1 or 5, wherein the reinforcing resin has a ratio of emulsion vinyl acetate resin and urea resin of 1: 0.3 to 2.5. The method of claim 1, wherein the preservative is selected from one of sorbic acid or potassium sorbate, the manufacturing method of disposable paper machine, characterized in that 0.1 to 0.5% by weight of the structural fiber dry weight is mixed. The method of manufacturing a disposable paper machine according to claim 1, wherein the concentration of the solid slurry in the slurry is 0.4 to 1.5%. The method of manufacturing a disposable paper machine according to claim 1, wherein the temperature of the mold for pressing the dry felt is 90 to 120 ° C. The method of manufacturing a disposable paper machine according to claim 1, wherein the water-soluble anato, which is a colorant, can be selectively used within the weight% of the structural fiber. (1) a pulp slurry made of structural fibers, a reinforcing resin, and a preservative are introduced into a tank equipped with a stirrer, followed by mixing with water to prepare a slurry; (2) 600 to 740 mmHg vacuum in a felt mold. Preparing a wet felt with the slurry, (3) drying the wet felt to 8% or less of moisture, and then compressing at a pressure of 8 to 35 kg / ㎠ to pass through an ultraviolet sterilizer. The manufacturing method of a disposable paper machine made of.