JP2879650B2 - Field mulching paper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION This invention is primarily a paper sheet to be used for such herbicides and Somosomokusa or kept in Upland, after a predetermined number of days elapsed, it becomes organic fertilizer, biodegradable which does not require removal According to mulching paper.

[0002]

2. Description of the Related Art As an example, the following means have conventionally been employed as means for weeding and controlling weeds in a field effect. Use of chemicals such as herbicides. A mulching sheet composed of a plastic film such as polyethylene is coated on the nursery. Use of mulching paper (many imported products) mainly made of softwood and kraft cooked pulp.

JP-A-6-78659 (hereinafter referred to as Conventional Example A)
Has a thickness of 0.08 to 0.1 with cellulose fiber as a base material.
30 mm, basis weight 35-160 g / m ² , wet tensile strength 0.20-2.00 kgf / 15 mm width, as a result of using a base paper paper-made so as to have a Steckigt sizing degree of 15 seconds or less. Keep the sheet for days,
It is disclosed that the dissolution disappears in 50 to 70 days. Also,
A case is described in which a corrugated waste paper is used as a raw material, a chemical is not added, and papermaking is performed using a paper machine at a basis weight of 120 to 160 g / m ² . In addition, there is a description that kraft pulp is used as a stock and no chemical is added, and the paper is machined to a basis weight of 50 g / m ² by a paper machine.

On the other hand, JP-A-60-250949 (hereinafter referred to as Conventional Example B) discloses a core material of crepe paper having a reference weight of about 30 to 80 g / m ² and an extensibility of about 5 to 15%. A mulching sheet formed with a coating comprising a dry residue of a latex dispersion of polyvinylidene chloride.

Further, JP-A-6-16834 (Conventional Example C) has a breaking length in the range of 0.80 km and less than about 6.20 km, and the base web is formed by drying a fiber base web containing cellulose fibers. Disclosed are examples of forming web composites treated with impregnant-containing latex supplemented with about 16 to about 80 parts by weight of impregnant. The web composite has a strength of about 50 kg / cm ² and about 0.2-0.6.
The latex has a wet strength to dry strength ratio of about-
Biodegradation present in the latex web composite having a glass transition temperature in the range of 50 to about 20 ° C and a ratio of synthetic and natural polymers of about 2: 1 to 4: 1 based on the total weight of the polymer. A natural sheet material, microcreped, and said that the natural polymer is selected from starch, protein and natural rubber.

[0006]

The conventional example has the following problems. Pesticide residues have a negative impact on communities and contribute to environmental destruction. In addition, there are many problems such as detection of residual pesticides from crops after harvest. When the temperature rises, the film stretches due to the heat reception, and the seedlings and the film come into contact with each other, resulting in a problem of poor growth. Even during the fallow period after harvesting, if the soil temperature is relatively low, such as in Hokkaido, the rate of weathering and thawing in the soil is slow, and rot and incomplete decomposition parts remain even at the time of planting. Requires removal work.

Further, Conventional Example A is a mulching sheet for paddy fields, and is used as a natural strength agent such as corn, potato, tapioca, etc. as a regulator of the size of the Stechig and the strength of the mulch paper. Starch is desirable, and it is described that if the addition rate is not less than 10% by weight by internal addition, external addition spraying or application, rigidity is increased and it is unsuitable for paddy fields, so that it dissolves and disappears after biodegradation. The period is as long as 50 to 70 days.

On the other hand, the prior art B is a composite sheet, in which both surfaces of a core material of crepe-like natural kraft paper are coated with an aqueous dispersion or latex of polyvinylidene chloride, which only increases the production cost. Without crepe paper,
Poor in tensile strength, easily broken, and requires three months for biodegradation.

Further, Conventional Example C uses latex in the same manner as Conventional Example B. In particular, as a farmland cover mulch, a cellulose web of softwood kraft fiber is used.
In the case of saturation with a latex emulsion of carboxylated styrene butadiene rubber containing weight percent bound styrene butadiene rubber, and in combination with a cellulose web of softwood kraft fiber in a 85:15 ratio with denier 3-6 mm polyester fiber. Examples of use are described. All of them use a synthetic resin for agricultural land in order to increase the tensile strength, and have a drawback that they are inferior in biodegradability and require a considerable number of days to be dissolved.

As described above, the conventional example is not developed as a field effect, but a so-called poly mulch such as a polyvinyl chloride film is used exclusively for the field effect, and a removal operation after harvesting is required. Was.

[0011] In addition, in the case of mulching paper, in order to improve the decayed or incompletely decomposed portion, it has been attempted to apply several kinds of decay accelerators, for example, nutrients of yeast, nitrogen, phosphoric acid and potassium. but was excessive weathering accelerated during the coating period of the paper, i.e., did not lead to breakthrough in adverse shift and crop timing with the coating periods and decay period.

By the way, the growth period of the seedlings is 30 to 50 days, and it is necessary to cover the seedlings during this period. However, the mulching paper repeatedly wets and repeats in a natural environment, and a breaking phenomenon occurs due to expansion and contraction. After the rupture, the air flowed from the rupture point, and the coating was impossible, and the original purpose of the mulching paper could not be achieved.

On the other hand, most of existing mulching paper for field action is imported, and domestically produced mulching paper is covered by diversion of hydroponic base paper. Then, imports, kind and pulping process conifer of the wood, depending on basis weight in paper making point in kraft pulp system, - weathering in 50 g / m ² or more in soil due to long fibers The speed of water disintegration was slow, and the decay of pulp fiber at the time of planting after fallow was often incomplete, and work to remove that part was necessary.

[0014]

SUMMARY OF THE INVENTION Accordingly, the present invention provides
It is used for mulching paper.
In order to prevent tearing and for a specified number of days,
Field action multi that possesses the degree of noise, light shielding, and tear strength
Suggest paper. That is, the field action martin of the present invention
Paper has a basis weight of 50 to 150 g / m ² and a size of 80 to 1
20 seconds, breaking length (longitudinal direction) 2.8-5.6km, light transmission
Uneven processing is performed so that the rate is 0 to 5% and the degree of elongation is 5% or more.
The treated paper is used as base paper, and starch is added to it in an amount of 1 to 15% by weight.
It is characterized by containing .

In the present invention, the base paper may have a height of 0.3 m.
2. The flute processing according to claim 1 , wherein the flute processing is performed to m to 5.0 mm.
We propose field action mulching paper.

[0016] Also, in the present invention, the base paper has a pitch of 5 m.
m, height 0.3mm, diameter 2mm
A field action mulching paper according to claim 1 is proposed.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The base paper constituting the field action mulching paper of the present invention may be coniferous or kraft pulp-based paper, but the use of cardboard waste paper is advantageous in various conditions such as strength and cost. The field action mulching paper of the present invention has a basis weight of 50 to 1
50 g / m ² , degree of size 80 to 120 seconds, breaking length (longitudinal direction) 2.8 to 5.6 km, light transmittance in the range of 0 to 5%
The base paper was flute-processed by a corrugating machine to form a flute-processed paper . Further, the mulching paper of the present invention is characterized in that starch (corn, tapioca, potato) or a similar polysaccharide substance is used in a papermaking process of base paper or the like.
It was internally added or applied in a range of 5% by weight.

Next, a test example of the tensile strength using this base paper will be described. -Test 1--------------------------------------------------------------------------------------------------------------------- Base paper A 7.8 1.8 2. Base paper B 12.0 2.0 3. A flute processed paper of base paper A 7.5 13.0 4. Base paper A, B-flute processed paper 7.3 10.2 5. 5. E-flute processed paper of base paper A 7.2 10.0 F-fluted paper of base paper A 7.0 8.2 7.2. 7. A flute processed paper of base paper B 9.7 10.5 8. E-flute processed paper of base paper B 9.5 10.2 9. 9. F-flute processed paper of base paper B 9.3 8.6 Embossed paper of base paper A 7.1 5.1

Base paper A: Core base paper for corrugated cardboard, which has a general core strength level. The raw material blend is 100% Japanese-stage, basis weight 115 g / m ² , and the tensile strength is 7.8 kg. ・ Base paper B: Base paper specially made for paper mulch, the raw material blend is 100% Western-stage (conifer, kraft digested pulp waste paper) ), With a basis weight of 115 g / m ² and a tensile strength of 12 kg, 1.5 times that of base paper A.・ Embossed shape is 5mm pitch, 0.3m height
m, a diameter of 2 mm, which was produced as a prototype for the base paper and passed through a forming hot roll (140 ° C., linear pressure 30 kg / cm). It was moistened to a water content of about 15% and molded and dried with a hot roll.

[Test Method] A 15 mm wide paper was sandwiched between 18 cm spans, and wet (immersion in water) and drying (in an electric constant temperature dryer set at a temperature of 105 ° C.) were repeated 5 times.

[Test Results] All unprocessed base papers (samples 1 and 2 above) were broken and processed papers (3 to
10 samples) did not break. Although the degree of elongation of the A-flute processed paper was sufficient, it was difficult to ensure the stability of the step at the time of winding, and further devising is required for use.

-Test 2 (laying in the field)------------------------------------------------------------------------------------------------------------- Base paper A2. Base paper B3. A flute processed paper of base paper A 3.1 4. 4. Base flute B fluted paper A 5.8 E-flute processed paper of base paper A 6.4 6. 6. F flute processed paper of base paper A 6.9 7. 7. Embossed paper of base paper A 5.1 8. F-flute processed paper of base paper A 6.9

[Test Method] The multi-base paper was actually laid in the field at the above-mentioned degree of elongation, the seedlings were transplanted, and the presence or absence of breakage and the situation were confirmed.

Crops Chinese cabbage Construction length 100 m Observation date 50 days later

[Test Results] The base papers A and B (unprocessed) were broken. No breakage phenomenon was observed in the B, E, F flute processed product and the embossed product, but the 3.1% elongation product was the limit as judged from the paper tension. This is because once the paper gets wet due to rain etc.,
When the drying of the paper is started, the shrinkage is absorbed by the paper shape if it is evenly dried, but the soil is not flat but has irregularities, water remains in the concave parts, and the paper moisture varies. I do. Further, it is considered that the frictional resistance between the paper-absorbing portion (earth-to-paper) also increases. Therefore, in consideration of safety, if the base paper elongation is 5% or more, it can withstand severe conditions.

-Test 3 (rot speed)------------------------------------------------------------------------------------------------------ Craft / base paper 2. 2. Corrugated waste paper / base paper TMP base paper (heat the chip to around 120 ° C in advance,
3. Mechanical pulp obtained by softening wood and pulping with a refiner. Magazines, newspaper basements ５. 5. GP base paper (rough paper, etc.) 6. SCP base paper (hardwood is used, high yield, high pentosan content, high rigidity and high density, opacity is reduced by beating. Unbleached paper is used for corrugated paper core etc.) AP base paper (soda pulp)

1) The base paper was prepared by hand-making. Hand paper
The conditions are the same for all seven types.・ Basic weight 100g/ M²  ・ Freeness F = 350ml ・ Size 110 seconds

[Test Method] A beaker in which a predetermined amount of soil and water was collected in a constant temperature / humidity chamber (setting / temperature: 35 ° C., humidity: 100%) was allowed to stand, a sample was placed thereon, and a small amount of The soil was sprayed. A total of 40 days were observed. At every predetermined number of days, the degree of decay of the paper was determined by the naked eye and the touch (the decayed part of the paper was affected by microorganisms, the connection between the fibers disappeared and became a wet powder).

[Test Results]-The decay of starch-free products is slow.
Among them, craft was the slowest. At the 40th day of the standing time, the craft product finally turned into a wet powder on the entire surface of the paper. -Regarding base paper of samples 2 to 7 other than craft system,
The entire paper became decayed on the 30th to 35th day, but the decay of the long fiber portion in the waste cardboard was delayed. From this result, it is considered that the kraft-based long fibers are inherently hard to rot. -The effect of promoting decay by applying starch is remarkable.
As for the 0% coated paper, the kraft paper showed a completely decayed state in 20 days and the other samples in 17-18 days. Therefore, it can be said that the rot speed was doubled by the starch coating.

In order to confirm the above test results, the following three types were selected from the samples, and after harvesting, the used mulching paper and soil were mixed with an agricultural machine rotary, and during the fallow period, ie, from autumn to the spring of the following year. Left for about 5 months.

Sample Base paper A Corrugated cardboard waste paper type 5% starch base paper B Kraft type starch-free coating Base paper A F-fluted paper Corrugated cardboard waste paper type starch 10% coating

[Test Results] The decay state of the mulching paper for 5 months was that the base paper B (without the application of kraft starch) had incomplete decay portions scattered, confirming the test 3 results.

5 of base paper B, base paper A and F-flute processed paper
%, 10% starch was completely decayed, the fiber shape could not be found, and it was reduced to soil.

[0034]

The field action mulching paper of the present invention has a basis weight of 5
0 to 150 g / m ² , size 80 to 120 seconds, tear length
(Vertical direction) 2.8-5.6km, light transmittance 0-5%, elongation
Base paper is made of paper that has been roughened so that the tonicity is 5% or more.
And whether this contains 1 to 15% by weight of starch
It has excellent tensile strength,
Not only can it be performed efficiently,
In addition, it fully demonstrates the mulching function. That is, the present invention
Field mulching paper should have an elongation of 5% or more.
The paper is processed into an uneven shape, and breaks due to the expansion and contraction of the paper
Prevent elephants. Then, add or apply starch to the paper.
As a result, during the coating period, starch becomes a paper strength agent
It acts as a nutrient source for bacteria after a certain number of days.
Significantly accelerates weathering and liquefaction, compared to uncoated paper.
Demonstrate about twice the decay rate. After the decay is completely organic fertilizer
Was charged. In addition, the embossed product can be
It can be wound tightly without being affected by. Therefore, the winding
It is wound up like a bamboo shoot
That is rare. As a result, during transportation or loading or
There is an advantage that handling is easy when laying a field.

────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Masahiko Kobayashi 1-6-6-1 Yamanote, Nishi-ku, Sapporo-shi, Hokkaido 1-602 (72) Inventor Takenosuke Otani 1-1-404 (72) Suehiro, Ichikawa-shi, Chiba ) Inventor Masamitsu Tomita 5-12, Nishi 4-jokita, Nayoro City, Hokkaido (56) References JP-A-2-203720 (JP, A) JP-A-6-78659 (JP, A) Jpn. JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) A01G 13/00 302

Claims (3)

(57) [Claims] (1) a basis weight of 50 to 150 g / m ² and a sizing degree of 8;
0 to 120 seconds, breaking length (longitudinal direction) 2.8 to 5.6 km,
Unevenness so that light transmittance is 0-5% and elongation is 5% or more
The processed paper is used as the base paper, and starch is added to it for 1 to 15
Field-based mulching paper characterized in that it is contained by weight . 2. The base paper has a height of 0.3 mm to 5.0 m.
2. The field action mulching paper according to claim 1, wherein the mulching paper is fluted . 3. The base paper has a pitch of 5 mm and a height of 0.3.
The field action mulching paper according to claim 1, which is embossed to a diameter of 2 mm and a diameter of 2 mm .