KR101088455B1 - Method for manufacturing food packaging paper and its pulp from Rhodophyta - Google Patents

Abstract

The present invention is a food packaging paper using opaque red algae and a method of manufacturing the same, more specifically, using red algae, there is no use of chemicals in the production process is harmless to the human body even in contact with food, there is no smell, high production yield And edible opaque red algae pulp with excellent biodegradability and a method for preparing food packaging paper using the same. The food packaging paper using the opaque pulp is excellent in strength, low light transmittance even in low basis weight, no smell, very low air permeability to thoroughly block the movement of food between food and packaging containers to maintain the freshness of food It can be usefully used as a food wrapping paper, and by using red edible algae as a raw material, it will greatly contribute to the provision of a safe and eco-friendly paper packaging material that has excellent biodegradability and does not cause environmental pollution.

Red algae, food packaging, opacity

Description

Opaque food packaging paper using red algae and its manufacturing method {Method for manufacturing food packaging paper and its pulp from Rhodophyta}

The present invention relates to a food packaging paper using opaque red algae and a method for preparing the same, and more particularly, to an opaque red algae pulp that is harmless to humans and has excellent biodegradability even when contacted with food using red algae. It relates to the food packaging used.

To date, food packaging paper (cardboard) can be largely divided into products composed of recycled pulp and products composed of natural pulp.

In the case of the packaging cardboard consisting of the recycled pulp, there is a large amount of various foreign matter therein is limited use for direct contact with food, but in the case of packaging cardboard made of natural pulp, the components are common sense clean, It was used for the purpose of chicken box where food comes in direct contact.

However, the packaging cardboard made of natural pulp was not sufficient to satisfy the evaporation residues among the legal regulations on food packaging.In the process of manufacturing natural pulp, chemicals such as caustic soda, sodium sulfide, quinone compounds and chlorine compounds, It is known to have a detrimental effect on the human body by removing lignin by the reaction of. In the wood pulping process, there is a process that does not use a chlorine compound called TCF (Total Chlorine Free) at all, but most of the chlorine compound is used in the pulping process. It can not be said to be harmless to the human body at all, and for packaging purposes of various uses, for example, packaging for freezing storage, there was a problem such as strength decreases due to internal moisture and affects freshness.

In addition, conventionally, for the purpose of preventing food corruption and maintaining freshness, the food is dried or stored, or a packaging method using a special wrapping paper (for example, polyvinylidene chloride), high temperature sterilization method, low temperature freezer storage method, gas filling Law and electromagnetic wave irradiation methods have been mainly used. In particular, conventionally, chemical preservatives such as sorbic acid, propionic acid, benzoic acid, organic acids and phenolic compounds are added, or bactericidal and insecticides such as chlorine compounds, fatty acid compounds, chlorine dioxide, acids and alkali compounds are added. A method of preventing food spoilage or oxidation by adding antioxidants such as dibutylhydroxytoluene (BHT), butylhydroxyanisol (BHA) and ascorbic acid has been used.

However, the amount of the antimicrobial additives or the food packaging materials using the same has been limited due to the harmful effects on the human body and the environment, and is increasingly being avoided.

Therefore, the present inventors have applied for the "pulp made of red algae and its manufacturing method" in the Republic of Korea Registration No. 10-0811193 as a result of the continuous study on the pulp manufacturing method using the red algae.

Red algae contain a large number of fibres, called muscular muscles, which are several microns in diameter and are almost constant in all red algae. The crystallinity of red algae fibers is similar to cellulose fibres, in particular the thermal properties of bleached red algae fibres are better than cellulose fibres.

The internal gel extracts of red algae are used as food additives, health supplements, agar materials, etc., but red algae fiber is often used as a waste because there are few uses.

The invention filed by the present inventors includes the step of washing and extracting red algae to remove the radish, and then bleaching to produce red algae fibers, and the red algae fibers prepared by the above method are very smooth on printing paper or special paper. The limitation was that it could be used as a useful fiber.

In addition, the bleaching treatment according to the manufacturing method can improve the whiteness of the red algae fiber to 80% or more, but if the whiteness is improved to 80% or more, the consumption of a large number of bleaching chemicals and the yield of red algae fiber are caused.

Accordingly, the present inventors have completed the present invention by discovering that pulp for food packaging paper with high yield can be produced by using red algae in a new way and without using chemicals in the manufacturing process.

The present invention has been made in order to solve the above problems, there is no odor using red algae, there is no use of chemicals, harmless to the human body even in contact with food, the production of edible opaque red algae pulp excellent in high biodegradability To provide a method.

Another object of the present invention to provide an opaque red algae food packaging prepared according to the above production method.

In order to achieve the above object, the present invention provides a manufacturing method of edible opaque red algae pulp that is harmless to the human body even in contact with food using red algae, excellent in odorless strength and biodegradability.

In addition, the present invention provides an opaque red algae food packaging prepared according to the manufacturing method.

Hereinafter, the present invention will be described in detail.

Red algae food packaging paper according to the present invention of 60g / m ² It is an opaque red algae food packaging that has a very low odorless air permeability with an opacity of more than 80% even in basis weight.

Method for producing red algae pulp according to the present invention comprises the steps of immersing red algae in an aqueous basic solution; Sunlight exposure step; And bleaching treatment, wherein the sunlight exposure is based on a CIE LAB color standard measured by D65 (Daylight 6500 ^o K, Kelvin temperature 6500 ° C. in daylight). It is characterized by exposure to sunlight under conditions that simultaneously satisfy 35 and b * (D65)> 15.

The opaque red algae pulp according to the present invention comprises the steps of: a) dipping red algae in an aqueous basic solution; b) exposing the soaked red algae to sunlight; c) bleaching the red algae exposed to sunlight; And d) collecting and bleaching the bleached red algae; It is characterized in that it is prepared according to the manufacturing method of opaque red algae pulp comprising a. Please refer to Fig.

The red algae inhabit relatively deeper water than other algae, have a relatively small size, and have a variety of types of about 10,000 species. Red algae have a wider range of habitat than green algae and brown algae, and grow from shallow depths to deep water rays.

Red algae used in the present invention gelidiales, gigartinales gamble neck and will at least any one selected from the nemaliales, more preferably red algae according to the present invention is agar belonging to the agar gasarigwa (Gelidiaceae) in (Gelidium) , Oxtail ( Pterocladia) tenuis ), Acanthopeltis or mixed red algae.

More specifically, Gelidium elegans , Gelidium corneum , Gelidium chilens ) are used by dipping in a basic aqueous solution of potassium hydroxide (KOH) or sodium hydroxide (NaOH). The basic aqueous solution not only aims at removing impurities, but also plays a role of increasing the natural bleaching effect of exposure to sunlight, and the acidity of the basic aqueous solution has an important meaning.

It is preferable to use the said basic aqueous solution adjusted to pH 9 or more, More preferably, pH 11 or more is effective.

The step b) is a step of exposing red algae immersed in an alkaline aqueous solution to sunlight, and the color standards are exposed to conditions satisfying L ^* (D 65)> 35 and b ^* (D65)> 15 simultaneously More preferably, it is characterized by exposing conditions satisfying L ^* (D65)> 40 and b ^* (D65)> 15 at the same time.

The CIE LAB (L *, a *, b *) notation was developed by the CIE (International Lighting Commission) as a method of expressing color in a quantitative manner. a *, b *). At this time, if a is +, red is-, it is close to green, b is + is yellow, and-is close to blue.

Step b) more specifically, iii) cutting 10 to 30 g of red algae dried at a water content of 20% or less to a length of 5 to 15 mm to collect on a petri dish; And ii) measuring the color of the collected red algae with L ^* (D65), a ^* (D65), b ^* (D65) values using a contact colorimeter using a light source D65. . At this time, when the red algae immersed in the alkaline aqueous solution is exposed to sunlight, it is necessary to supply sea water or water to the surface from time to time so that the red algae are not completely dried.

The color reference conditions of L ^* (D65)> 35 and b ^* (D65)> 15 according to the present invention are important to the fiberization during pulp production, and the yield of red algae fiber by odor removal and natural bleaching action unique to seaweed. It has a great effect on improving whiteness.

The bleaching treatment step of step c) proceeds to the next step using a non-chlorine bleach, the non-chlorine bleach is any one or more oxygen-based bleach or sodium borohydride (NaBH ₄ ) selected from hydrogen peroxide (H ₂ O ₂ ) and oxygen. It is characterized in that any one or more reducing bleach selected from sodium hydrogen sulfite, sulfur dioxide, sodium sulfite, sodium thiosulfate and hydrosulfide, the bleaching treatment is characterized in that to increase the whiteness (%) of the red algae as necessary as a non-chlorine bleach It is done.

The bleaching treatment according to the present invention has the advantage of being environmentally friendly since there is no problem of dioxin generation by using elemental chlorine in a conventional pulp manufacturing process, and it is not only harmless to the human body, but also can easily prepare high opacity pulp. There is an advantage.

The present invention comprises the steps of: a) preparing an opaque red algae pulp prepared by the method for producing an opaque red algae pulp; And b) preparing food wrapping paper using the prepared pulp; It provides a method for producing opaque red algae food packaging paper comprising an opaque red algae food packaging paper. See FIGS. 2 and 3.

The opaque red algae food packaging according to the present invention has an opacity (%) of 80 g or more at a basis weight of 60 g / m ² , and more preferably, an opacity (%) of 80 or more and 100 or less.

The method for producing an opaque red algae food packaging paper according to the present invention further includes any one or more papermaking agents selected from the following: a), an intelligence enhancer, a dehydration retention agent, a size agent, a wet strength enhancer, a fixing agent, and a charge control agent. Can be prepared.

The manufacturing method of paper using wood pulp, rather than the manufacturing method of the opaque red algae food packaging paper is subjected to the beating process that makes it suitable for papermaking by mechanically treating the fibers in water in a conventional manner. Breaking of the fiber is called free beating, and when fibrillation occurs mainly, it is called wet beating.

By this beating, the fiber outer layer is removed, internal fibrillation occurs, the fiber length is cut, microfibers are formed, and partial dissolution of the chemical composition occurs. The beating makes the fiber flexible and increases the bonds between the fibers, so that as the altitude rises, the paper has a dense structure.

In the next step, the sizing process is carried out using a sizing agent for a chemical which imparts the resistance of ink or water to the paper. There are two kinds of sizing, surface sizing and internal sizing.

The next filling process involves incorporating minerals, such as clay or calcium carbonate, into papermaking pulp to increase paper opacity, printability, and basis weight, and to collect miscellaneous material mixed with paper before sending the paper to papermaking through screening and selection. Remove the to make the properties of the paper produced.

After forming the web on the wire from the pulp and the selected pulp and the sizing agent, filler, various additives and the like mixed on the wire, the paper is pressed, dehydrated, dried to make a paper to process.

In the papermaking method according to the present invention, since red algae rather than wood pulp is used as a raw material, no beating process is required.

The method for producing opaque red algae pulp according to the present invention has an advantage of being environmentally friendly since there is no problem of dioxin generation due to the use of chlorine, and it is not only harmless to the human body but also has a high opacity and can easily produce a pulp with low light transmission. There are advantages to it.

The present invention is a method of producing the opaque red algae pulp has excellent strength, low light transmittance, low air permeability and very low air permeability to thoroughly block the movement of food between food and packaging containers to maintain the freshness of food It can be usefully used as a wrapping paper.

The manufacturing method of the opaque red algae food packaging paper according to the present invention has the advantage that does not cause environmental pollution due to excellent biodegradability by using the red algae as a raw material, there is an advantage that can provide a safe eco-friendly pulp.

Hereinafter, the present invention will be described in more detail with reference to Examples. These examples are only for illustrating the present invention in more detail, it is to those of ordinary skill in the art that the scope of the present invention is not limited by these examples in accordance with the gist of the present invention. Will be self-evident.

[ Manufacturing example  1] Preparation of transparent red algae pulp

(1) red algae processing

Gelidium elegans ) was sufficiently immersed in an aqueous potassium hydroxide (KOH) alkali solution of pH 12 for 30 minutes at a temperature of 20 ℃.

(2) sunlight exposure stage

In order to prevent the dried red algae of step (1) from completely drying, the surface of the red algae was continuously exposed to sunlight while supplying sea water or water from time to time until the following color standards were satisfied.

A glass petri dish (approximately 8 cm in diameter) is placed on a white paper, 10 g of sample red algae dried at a water content of 20% or less is collected on a petri dish, cut into pieces of 5 to 15 mm in length, and then a colorimeter is measured. The red algae samples cut out by contact with the red algae were measured by L * (D65), a * (D65) and b * (D65) values. At this time, the light source of the colorimeter is D65, the diameter of the exposure hole of the light source is 8 mm. The point at which sunlight exposure is completed is based on when L * (D65)> 35 and b * (D65)> 15 are satisfied at the same time, more effectively L * (D65)> 40 and b * (D65). > 15.

(3) bleaching treatment step

The red algae of step (2) after exposure to sunlight were bleached at 80 ° C. for 2 hours at pH 12 in a 5% aqueous hydrogen peroxide (H ₂ O ₂ ) solution. When the whiteness (%) of red algae was 35 (TAPPI method T452 om-98), bleaching was completed, and the bleached red algae was obtained by washing.

(4) Pulping  step

The final bleached red algae of step (3) was pulverized with the blended red algae using a blender, and classified into pulverized fibers over 200 meshes for pulping.

[ Manufacturing example  2] Preparation of Opaque Red Food Packaging Paper

It carried out in the same manner as in Preparation Example 1, but proceeded by adding a papermaking process. The red algae pulp was prepared into 60 g / m2 opaque red algae food wrapper using the TAPPI method T205 sp-95.

[ Example  1 ~ 3] Investigation of Bleaching and Odor Removal Effect According to Sunlight Exposure Time

The chromaticity of red algae immersed in basic aqueous solution was measured under the following conditions to investigate the effect of bleaching and odor removal according to sunlight exposure time.

A glass petri dish (approximately 8 cm in diameter) is placed on a white paper, 10 g of sample red algae dried at a water content of 20% or less is collected on a petri dish, cut into pieces of 5 to 15 mm in length, and then a colorimeter is measured. The red algae samples cut out by contact with the red algae were measured by L * (D65), a * (D65) and b * (D65) values. At this time, the light source of the colorimeter is D65, and the diameter of the exposure hole of the light source is 8 mm.

The chromaticity of red algae before exposure to sunlight was used as a control, and the chromaticity of Comparative Example 1 and Tables 1 to 3 of Table 1 was used.

As a result, as can be seen in Table 2 below, the exposure of sunlight was not sufficiently achieved in the chromaticity of Comparative Example 1, the smell of seaweed remained, and the color was still dark, so that the sufficient bleaching effect was not observed. Due to the sufficient bleaching effect, it was bright in color and was able to make excellent opaque red algae pulp without any seaweed smell.

[ Example  4 to 6] On chromaticity  Characteristics of Food Packaging Paper

Red algae of Examples 1 to 3 were prepared according to the method of Preparation Example 2 opaque red algae wrapping paper. However, red algaes of Examples 1 to 3 were pulped immediately without performing bleaching treatment, and thus no chemicals were used. The following control was used bleached wood pulp (softwood: hardwood, 50:50) commonly prepared.

The characteristics of the red algae food packaging paper prepared in the control and Tables 4 to 6 of the Table 3 (basic weight, thermal length, rupture index, opacity, whiteness, air permeability) were investigated. The results are shown in Table 4 below.

As a result, the opaque red algae paper according to the present invention is 60 g / m ² of wrapping paper using a natural material with minimal processing, unlike ordinary wood pulp Opacity (%) is more than 90 in basis weight, has low transparency and excellent strength, and also has very low air permeability in low basis weight, and it is an opaque food wrapping paper that keeps freshness of food by thoroughly blocking material movement between food and packaging containers. It was confirmed that it can be used as.

1 is a schematic of the manufacturing process of the opaque red algae pulp according to the present invention,

Figure 2 is a schematic of the manufacturing process of the opaque red algae food packaging paper according to the present invention,

Figure 3 is a photograph showing an opaque red algae food wrapping paper according to the present invention.

Claims (11)

a) dipping red algae in a basic aqueous solution; b) exposing the soaked red algae to sunlight; c) bleaching the red algae exposed to sunlight; And d) collecting and pulping the bleached red algae; Method for producing an opaque red algae pulp comprising a. The method of claim 1, The red alga is a method for producing opaque red algae pulp, characterized in that any one or more selected from wood, stone, gambling and noodles. 3. The method of claim 2, The red algae is a method for producing a non-transparent red algae pulp, characterized in that in agar (Gelidium), gaewoo hornbeam (Pterocladia tenuis), staggered in (Acanthopeltis) or a mixed red algae belonging to the agar gasarigwa (Gelidiaceae). The method of claim 1, The step b) is a method of producing an opaque red algae pulp, characterized in that the color standard is exposed to the conditions satisfying L ^* (D65)> 35 and b ^* (D65)> 15 at the same time in the CIE LAB value. The method of claim 1, The bleaching process of step c) is a method for producing opaque red algae pulp, characterized in that using a non-chlorine bleach. The method of claim 5, The non-chlorine bleach is at least one selected from hydrogen peroxide (H ₂ O ₂ ) and oxygen or any one selected from sodium borohydride (NaBH ₄ ), sodium bisulfite, sulfur dioxide, sodium sulfite, sodium thiosulfate and hydrosulfide Method for producing an opaque red algae pulp, characterized in that the above reducing bleach. Opaque red algae pulp prepared by the method according to any one of claims 1 to 6. a) preparing an opaque red algae pulp by the method according to any one of claims 1 to 6; And b) preparing a food wrapping paper using the prepared pulp; Method for producing an opaque red algae food packaging paper comprising a. The method of claim 8, After the step a), the production of opaque red algae food packaging, characterized in that it further comprises any one or more of the papermaking agent selected from the strength enhancer, dehydration retention agent, size agent, wet strength enhancer, fixing agent and charge control agent Way. Opaque red algae food packaging prepared by the method according to claim 8. The method of claim 10, The food packaging paper opaque red algae food packaging, characterized in that the opacity (%) of 80 or more.

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