JP2003089997A - Biodegradable paper product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a biodegradable paper product, especially a paper product which is decayed to produce an organic manure after used and scrapped and can thereby be degraded in the natural environment without needing removal. SOLUTION: This biodegradable corrugated base paper contains a photosynthetic bacterium group grown by assimilating inorganic nutrients or organic nutrients with or without light energy. The corrugated board box is produced from the corrugated base paper. Since the paper material contains the photosynthesis bacterium group, the paper material can biologically be degraded, or the period of the biodegradation can be shortened. Especially, the paper material has a remarkable effect, when applied to a paper product, such as a corrugated board box, which contains pulp or the like as a raw material, is degraded in the natural environment in a certain extent after scrapped, is slowly (biologically) degraded because of being relatively thick or the like, and therefore needs many days until the paper material is degraded and decayed with bacteria in soil to return to the soil. Thereby, the incineration of such the paper products, such as corrugated paper, as incinerated in large amounts can be avoided, and evils such as considerations on waste treatments and the damages of incinerators can be removed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a biodegradable paper product, and more particularly to a global environment-friendly technology capable of decomposing after use and disposal to become an organic fertilizer and decomposing in a natural environment without requiring removal. .

[0002]

2. Description of the Related Art In recent years, there has been growing worldwide interest in the problem of effects on the human body and natural environment. One of the conditions for providing products is that they are environmentally friendly. Corrugated board is widely used in a wide range of fields including a packaging field for housing home electric appliances. Corrugated paperboard is said to account for 60% of all paperboards due to the remarkable spread of corrugated paperboard. Corrugated board is generally composed of a liner and a center raw paper.The liner is a paperboard used as a front cover or a backing board of the corrugated board, and the pulp liner is made of unbleached kraft pulp, and
The jut liner is made from unbleached kraft pulp mixed with waste paper. The main raw paper is mainly made of semi-chemical pulp and straw or waste paper as the main raw material. Since a large amount of corrugated board is used in boxes and the like as described above, treatment after the use is a problem. Cardboard
To some extent, it is decomposed in the natural environment (biodegradation) after it is discarded because it is made from pulp etc., but due to its relatively thick thickness, there is a limit even if it is biodegradable. , It often takes many days to decompose into bacteria in the soil, decay, and return to the soil. Therefore, there is a problem with the decay speed of corrugated board in the soil, so in reality, corrugated board is currently incinerated in large quantities, and incineration is a secondary problem such as damage to the incinerator. Causing serious pollution.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a technique capable of improving and advancing such environmental problems. Other objects and novel features of the present invention will be apparent from the following description of the specification.

[0004]

DISCLOSURE OF THE INVENTION The present invention comprises a photosynthetic bacterium group which is grown by utilizing as an inorganic or organic nutrient with or without light energy a paper material. Regarding the characteristic biodegradable paper product, in a preferred embodiment, the paper product is a corrugated cardboard base paper or a cardboard box manufactured from the corrugated cardboard base paper.

[0005]

DETAILED DESCRIPTION OF THE INVENTION

By incorporating a group of photosynthetic bacteria in the paper material, it is possible to cause biodegradation or shorten the period until biodegradation.

The group of photosynthetic bacteria used in the present invention is grown by utilizing assimilation of inorganic or organic nutrients with or without light energy. It means that it grows by utilizing assimilation or by utilizing organic nutrition without light energy. The photosynthetic bacterium group includes photosynthetic bacteria such as photosynthetic bacteria and microalgae. The photosynthetic bacteria group can be obtained, for example, by putting a nutrient source in a culture device such as a tank, irradiating light to perform photosynthesis, and culturing. The culture is used for treating wastewater, producing hydrogen (H ₂ ) which is clean energy, fixing carbon dioxide (CO ₂ ) in the atmosphere, growing and cultivating plants, for example, livestock manure and A method of performing liquid culture of photosynthetic bacteria in a tank using a liquid extracted from outer skin of mandarin oranges or municipal sewage sludge and using the culture as liquid fertilizer for growing and cultivating plants [water treatment technology Vo
l. 36, No. 3, p135-145 (1995)]
And so on. The photosynthetic bacteria are generally roughly classified into three groups, red non-sulfur bacteria, red sulfur bacteria, and green sulfur bacteria. Examples of purple non-sulfur bacteria include those belonging to the genera Rhodospirillum, Rhodobacter, Rhodococcus, Rhodopseudomonas, Rhodomicrobume, Rhodocyclus and Rhodovira. More specifically, Rhodospirillum rubram (Rodospiri)
lulum rubrum, Rhodobacter spheroides
s), Rhodococcus australis (Rhodoko)
cus australis, Rhodomicrobium vanilly
llii), Rhodesicula gerachinox (Rodoc)
yclus gerachinocus), Rodovira
Globiformis (Rhodopila globif
ormis) and the like. The above-mentioned three groups of bacteria can be used alone or in combination of two or more. As the medium for culturing the photosynthetic bacteria, a liquid medium such as an extract from an organic substance, a solid medium, or the like can be used. Examples of organic substances that serve as organic nutrients include grain solid components, corn steep liquor, molasses, molasses, organic matter compost and the like. As a solid medium component to be an inorganic nutrient, for example,
Inorganic substances such as attapulgite, montmorillonite, zeolite, vermiculite and perlite can be mentioned. The group of photosynthetic bacteria may be a gel substance or the like, which is not liquid but is immobilized by an immobilizing material such as sodium alginate. Photosynthetic bacteria are fast-degrading bacteria even in an anaerobic environment, and, unlike general anaerobic bacteria, examples of the above-mentioned microalgae that do not generate methane gas, malodor, etc. as a decomposition product are green algae and cyanobacteria. To be done.

In order to make the photosynthetic bacteria group contained in the paper material, for example, it may be added and blended in the pulp at the stage of making a stock as follows. Paper is generally beaten of pulp raw materials (working step in which pulp is mechanically treated in water to give pulp fibers properties suitable for producing the intended paper), sizing (water The workability of adjusting the penetrability of the paper), filling (the work of making the paper opaque, increasing the whiteness, smoothing the surface to improve printability), coloring, etc. It can be obtained by diluting to a concentration of, sending it to a paper machine, making paper, and finishing.

As the paper material, corrugated cardboard, white paperboard,
Examples include yellow paperboard, chipboard, colored paperboard, paperboard such as building material base paper, newspaper roll paper, printing paper, writing paper, drawing paper, wrapping paper, thin paper, and hybrid paper. It may be synthetic paper made of polypropylene or the like. Paper products are
Examples thereof include cardboard boxes and papers called mulching papers, which are mainly used for weeding, controlling or keeping heat in field cultivation.

[0010]

[Example] Paper making example 1. Cardboard waste paper under the following hand-making conditions
The following base paper A was prepared. Basis weight 100G / m^Two  , Freeness F = 350ml, service
Izu degree 110 seconds Papermaking example 2. Under the papermaking conditions of Papermaking Example 1, it is better than corrugated cardboard waste paper.
The following cultured photosynthetic bacteria are added to the stock for making base paper A
Then, paper making was carried out to obtain base paper B. Photosynthetic bacteria (Rho
(Dr. capsulata) is as follows
What was cultivated was used. In a 10t culture tank,
Sodium ropionate 0.1%, monopotassium phosphate 0.
5%, dipotassium phosphate 0.06%, ammonium sulfate
0.1%, magnesium sulfate heptahydrate 0.02%, salt
Sodium chloride 0.02%, calcium chloride dihydrate
0.05%, Bact yeast extract (Difco)
0.01%, vitamin solution (thiamin hydrochloric acid 50 mg, sodium
Iacin 50mg, paraaminobenzoic acid 30mg, pyri
10 mg of doxyhydrochloric acid and 5 mg of pithione were added to 10 parts of distilled water.
Solution dissolved in 0 ml) 1 ml / liter, trace element dissolved
Liquid (EDTA-2Na 1000mg, FeCl_Two6H
_TwoO 2000mg, ZnCl_Two 100 mg, MnCl
_Two・ 4H _TwoO 100mg, H_ThreeBO_Three 100 mg, C
oCl_Two・ 2H_TwoO 100mg, Na_TwoMoO_Four・ 2
H_TwoO 20mg, CuCl_Two・ 2H_TwoO 10mg, N
iCl_Two・ 6H_TwoO 10mg and Na_TwoSeO_Three 5m
g solution in 1 liter of distilled water) 1 ml / lit
9000 liters of culture medium containing 100 ml
Intermittent sterilization was repeated 3 times. Cool the medium to 30 ℃
After that, Rhodoba that had been cultivated in another culture tank
cter capsulata 3g wet weight / liter
900 liters of inoculum of the concentration was aseptically inoculated. 100
After stirring at rpm for 10 minutes, stop stirring and culture.
It was. Stir 10 minutes a day for 10 days and incubate for 3 days
A bacterial cell having a wet weight of 4 kg was obtained. Decay test Base paper A and base paper obtained above by the following test method
The decay test of B was conducted. Constant temperature / humidity tank (setting / temperature 3
A sample of a predetermined amount of soil and water within 5 ° C and 100% humidity)
Place the sampler on top of it, place a sample on it, and
Sprayed. Observation was carried out for a total of 40 days. Every predetermined number of days
Degree of decay of the paper with the naked eye and touch (the decayed part of the paper is slightly
Influenced by the material, the connection between pulp fibers disappears and gets wet
It becomes powdered. ) Was used to determine the degree. test results The base paper A is a powder that the entire surface of the paper has finally become moist after 40 days of standing.
It became a physical condition and its decay was slow,
The base paper B with the added bacteria has a stationary period of more than 10 days.
When it became powdery, it became decayed.

[0011]

EFFECTS OF THE INVENTION According to the present invention, a paper material is made to contain a group of photosynthetic bacteria to cause biodegradation, or
The period until biodegradation can be shortened. In particular, since pulp is used as a raw material to some extent, it decomposes (biodegrades) in the natural environment after disposal, but due to its relatively thick taste, etc. However, it is very effective when applied to paper products that are slow in biodegradability and require many days to decompose into bacteria in the soil and return to soil. It is not necessary to incinerate paper products that are incinerated in large amounts, such as corrugated cardboard, and it is possible to eliminate harmful effects such as difficulty in disposal and damage to the incinerator.

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 3E086 AD02 BA14 BB72                 4B065 AA01X AC20 BD05 CA54                 4L055 AA11 AG42 AH50 BD10 FA20                       GA06 GA50

Claims (2)

[Claims] 1. A biodegradable paper characterized in that it comprises a group of photosynthetic bacteria grown by utilizing as an inorganic or organic nutrient with or without light energy a paper material. Product. 2. The biodegradable paper product according to claim 1, wherein the paper product is a corrugated cardboard base paper or a cardboard box made of the corrugated cardboard base paper.