JPS633732A - Seedling growing paper - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a novel seedling-raising paper that facilitates the growth of plant roots.

[Conventional technology and its problems]

BACKGROUND ART Conventionally, bottomless pots for raising seedlings, such as paper tube aggregates, have been used for raising seedlings. The paper used for this is strong paper made from wood pulp mixed with synthetic fibers and preservatives.
Efforts have been made to provide moisture strength and corrosion resistance necessary for seedling raising.

However, with kraft paper mixed with synthetic fibers, for example, in order to obtain the necessary wet ball strength for pot bodies at the end of seedling raising, it is necessary to mix 15 to 25% of synthetic fibers into the kraft paper. However, once the seedlings are raised, the pot is empty!
After being planted in a mahon field, the roots of the plants are hindered by the wood pulp fibers remaining in the mesh-like pores of the synthetic fibers, and their elongation is inhibited. For this reason, in Chinese cabbage, Chinese orchid, etc., which have weak rooting ability, growth has been particularly delayed after planting in the main field, causing problems such as reducing the effectiveness of seedling transplantation. Therefore, there are many cases where it is unavoidable to remove paper traces and transplant bare block seedlings at the time of main planting, which not only results in a loss of labor but also causes the soil blocks of the seedlings to collapse due to the removal of paper traces. However, there were disadvantages such as the fact that the effect of raising seedlings using seedling pots was often lost.

As an improvement method for these, a sheet of kraft paper with a porous, corrosion-resistant, wet-strength non-woven fabric pasted on one or both sides (for example, Japanese Patent Application Laid-Open No. 58-60919, Japanese Patent Publication No. 59-198), No. 22489), a sheet in which corrosion-resistant synthetic fibers are uniformly dispersed on the upper layer of kraft paper and then turned into a p-form by using an adhesive or heating (for example, Japanese Patent Application Laid-Open No. 109524/1989) ), or sheets in which wet paper sheets of natural fibers and porous sheets in which corrosion-resistant synthetic fibers are uniformly dispersed are deposited on paper machine wires or blankets have been developed.

However, even with such improved sheets, it was not possible to obtain a sheet with good rooting properties and extremely good wet strength at the time of transplantation.

[Purpose of the invention]

An object of the present invention is to provide a seedling-raising paper which, when used as a pot for raising seedlings, has improved rooting properties without impairing its strength during transplanting. Another object of the present invention is to provide a novel seedling-raising paper comprising multiple layers of cellulose fibers and synthetic fibers, and a method for producing the same.

[Concrete measures to solve the problem] The seedling raising paper of the present invention is made of a wet paper sheet mainly made of cellulose fibers, and on at least one side thereof, the mesh is formed of a mesh having a large number of micro-blocking parts of arbitrary shapes. 9 tsubo weight 1~50 f/m
This paper is made from a synthetic fiber sheet with perforations using a wet-forming method.

That is, the seedling raising paper of the present invention is a composite sheet consisting of a paper sheet such as kraft paper and a synthetic fiber sheet, and is characterized in that the synthetic fiber sheet has a large number of microscopic holes of arbitrary shapes.

The wet paper machine for producing paper for raising seedlings of the present invention may be a paper machine used for producing ordinary paper, but it may be tilted down. Use a type that combines two or more wire parts (wire parts) and has a closed mesh on the negative side. For example, a circular mesh -
It is common to perform gold dusting using combination paper machines such as fourdrinier, cylinder-circle, cylinder-slanted wire, etc.
The combination types of paper machines are not limited to these, and can be used in combination as appropriate.

Although there is no particular limitation on the fine shape of the mesh closing portions of the screen of the paper machine used to produce the seedling raising paper of the present invention, it is preferable that the closing portions are arranged evenly on the screen. Basically, without reducing the burial strength,
It is desirable to increase the porosity as much as possible.

In reality, we varied the size and pitch of the occlusions and examined the optimal pattern that balanced burying strength and rooting ability.As a result, we found that the size of the micro-occlusions was 7 to 100 m, and the size of the micro-occlusions was 5 to 15 m. It has been found that the porosity of the net is preferably in the range of 20 to 70%, and within these ranges, the burial strength is maintained and the rooting ability is improved.

The seedling-raising paper of the present invention has a cellulose fiber sheet mainly made of cellulose fibers that maintains the strength properties required during molding and use for seedling-raising, and the synthetic fiber sheet maintains corrosion resistance against soil at a stage after the start of seedling-raising. It is a gold-dusted paper that skillfully combines two functions.

The sheet made of cellulose fiber, which is one of the sheets of the above-mentioned gold-dusted sheet, may be any ordinary paper mainly made of wood pulp and is not particularly limited. In addition to wood pulp, a small amount of chemicals commonly used in paper making, such as synthetic fibers other than cellulose fibers or various paper strength enhancers, may be mixed for the purpose of reinforcing strength. It is preferable to mix the mixture to the extent that it will rot and decompose after a period of time during which the seedlings are grown in the soil.

The synthetic fiber sheet is a sheet made of synthetic fibers with a basis weight of 1 to 50 P/m", preferably 3 to 20 g/m2.
Preferably, 10% or less of wood pulp may be mixed into the paper.

If it is blended in an amount of 10% or more, the network structure of the synthetic fiber layer decreases, which impairs rooting properties, which is not preferable. The synthetic fibers used are corrosion-resistant polyvinyl alcohol,
Synthetic fibers and synthetic pulps such as polyolefin-based, polyester-based, polyamide-based, polyacrylonitrile-based, and polyvinyl chloride-based fibers can be used alone or in combination.

In order to improve water dispersibility and hydrophilicity, these synthetic fibers are treated with surfactants and thickeners such as polyethylene oxide, polyacrylic soda, tripolysodium phosphate, polyacrylamide, polyethyleneimine, etc. It can be used in combination with a dispersant.

In addition to self-adhesive synthetic fibers, there are also synthetic fibers mixed with fibrous binders such as wet heat adhesive polyvinyl alcohol type, dry heat adhesive type polyolefin type, polyester type, and ethylene vinyl acetate co-heavy metal thread. can be used.

These fibers exhibit adhesive properties due to the heat of the vilaya, but
Adhesion can also be imparted by pressure treatment under high pressure and high heat using a heat roll. Furthermore, it is also possible to bond synthetic fibers by spraying, impregnating, or coating the above-mentioned binder object, or a water-resistant liquid binder such as PVA, acrylic resin, latex, or vinyl acetate on-machine or with an off-coater. can.

Note that the seedling raising paper of the present invention may contain stile, preservatives, fungicides, insecticides, fertilizers, herbicides, etc. depending on the type of plants to be raised.
Growth hormones, dyes, and other substances that are effective in promoting plant growth are mixed on-machine during paper making and paper combining processes.
Perfuming can also be achieved using appropriate means such as impregnation, spraying, and coating.

Hereinafter, the method for manufacturing the seedling raising paper of the present invention will be explained.

FIG. 1 is a schematic diagram of the manufacturing process of the seedling raising paper of the present invention, showing an example of forming the paper into two layers using a circular mesh and an inclined wire.

A paper stock mainly composed of cellulose fibers dispersed in water supplied to a vat 2 from a paper stock inlet pipe 1 is drawn up by a circular mesh 3 and picked up by a blanket 4 to form a wet paper paper sheet 5.

On the other hand, the synthetic fiber paper stock dispersed in water supplied from the inlet pipe 6 is placed on an inclined wire 7 with wire parts closed in an arbitrary pattern to form a synthetic fiber sheet 8 with holes almost identical to the pattern of the wire parts. , the natural fiber wet paper sheet 5 on the blanket previously formed is picked up to form a laminated sheet 9. Is this a combination sheet? It is dried with the ri dryer 10 and becomes the laminated paper 11, which is a hope reel 1.
2 becomes the roll paper 13.

In the above case, the synthetic fiber layer is laminated on one side,
It is also possible to use a three-layered seedling-raising paper made by combining synthetic fibers on both sides of a wet paper.

When manufacturing a seedling-raising container using the above-mentioned seedling-raising paper of the present invention, the seedling-raising paper is cut to the required width because the fibers themselves are fused together or glued together using glue. Then, the cut pieces are stacked on top of each other so that the synthetic fiber layers are on the inside of each other, and both sides are heat-sealed or adhered with water-resistant glue to form a hexagonal or square pot body as shown in FIG.

Such pot bodies may be used alone, or they may be glued together and used as a fruit pot body 14 as shown in FIG. 3. When manufacturing a group pot body, the outside of each pot body may be subjected to antiseptic treatment or root entanglement prevention treatment, etc., as appropriate.

Implementations 914 of the invention are described below.

Example 1 Seedling raising paper was produced using the paper machine shown in FIG.

First, 5027m from the wood pulp (NUK?) with a circular net.
” (solid content), and then vinylon fiber (VPB 203 x 15, manufactured by Clan Co., Ltd.)
) and fibrous vinylon binder (Clan Co., Ltd. g VP
B 101
% by weight, the circles shown in Fig. 4 were arranged in a staggered pattern at a slurry concentration of α02% by weight, the hole diameter was 5mm, the pitch was 7mm,
An 8 f/m'' synthetic fiber sheet was made using an inclined wire equipped with a wire packed with a porosity of 4 to 3%, dehydrated, dried at 120°C with a dryer, and rolled up.

The papermaking speed at that time was 500 m/min.

The embedding strength of the obtained laminated paper and as shown in Fig. 3,
Seedlings were grown in pots with no lids and bottoms, and the evaluation of their rooting ability is shown in Table 1.

For comparison, the above vinylon fiber (VPB manufactured by Cran Co., Ltd.)
205 x 15 gourds), fibrous vinylon binder (
Clan Co., Ltd. VPB 101 x 7 tows) 50:5
0, and in a state of uniform dispersion with a normal wire, 81/
Paper made from a 50 f/m2 natural fiber (NUKP) sheet (Comparative Example 1)
and natural fiber (NU'KP) with fibrous vinylon binder (Clan (a) aVPB 101X 7 vm
5817 m'' synthetic fiber mixed paper (Comparative Example 2), which was made by mixing 18% of ) fl, was evaluated in the same way. The rooting ability has been greatly improved.0 Table 1 However, ■The number of roots is the total number of roots that have sprouted from the side of the seedling pot. ■The pot used was a hexagonal one with a diameter of 5 mm and a side height of 5. there was.

Example 2 The same conditions as in Example 1 were used, except that the diameter and aperture ratio of the wire closing circles were the same as in Example 1, and the wires were arranged as shown in Figure 5 for the entire closing circle pattern. The same seedling-raising test as in Example 1 was conducted on the seedling-raising paper made in the following manner.

As a result, the embedding strength, rooting ability, and handling ease were all the same as those of the seedling raising paper of Example 1.

Example 3 In Example 1, as raw materials for the synthetic fiber sheet layer, vinylon fiber (VPE103X10 cod manufactured by CLAN Co., Ltd.) and fibrous binder (VPB101X 7 m @ manufactured by CLAN Co., Ltd.) were used.
) to form a synthetic fiber sheet layer with a basis weight of 6 f/rn'' by changing the degree of wire packing in the inclined wire portion as shown in Table 2, and then combining them to obtain seedling-raising paper. The resulting paper for raising seedlings was evaluated in the same manner as in Example 1.The results are shown in Table 2.As the porosity of the net increases, the embedding strength decreases; Within this range, sufficient strength was maintained and the number of roots increased.

Example 4 In Example 1, as raw materials for the synthetic fiber sheet layer, vinylon fiber (manufactured by Clan Co., Ltd., VPB103X10 Gourd), binder (manufactured by Clan Co., Ltd., VPB 101X7 m)
) was used, but seedling-raising paper was obtained under the same conditions. However, by changing the basis weight of the synthetic fiber sheet layer as shown in Table 6,
The obtained seedling growing paper was evaluated in the same manner as in Example 1.

Table 2 Table 3 (Effects of the Invention) The seedling raising paper obtained by the present invention is coated with an ultra-thin sheet of synthetic fibers of 10 f/m” or less, which was impossible with ordinary non-woven fabric manufacturing technology. It became possible to manufacture it by combining papermaking.

Because the synthetic fiber islands have a structure with large voids, rooting performance is extremely good, which not only saves labor during transplanting but also improves plant growth.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of the manufacturing process of the seedling-raising paper of the present invention, Fig. 2 is a perspective view of a hexagonal pot body manufactured using the seedling-raising paper of the present invention, and Fig. 3 is the pot body shown in Fig. 2. FIG. 4 is a perspective view of a group pot body to which is glued together, and FIGS. 4 and 5 are diagrams showing wire closing patterns. 1... Paper stock introduction pipe, 2... Bat, 3... Circular screen,
4...Blanket, 5...Wet paper sheet, 6...Introduction tube,
7... Inclined wire, 8... Synthetic fiber sheet, 9...
・-Paper sheet, 10... Dryer, 11...
Laminated paper, 12... Hope reel, 13... Winding paper, 14... Gathering pot body

Claims (1)

[Claims] 1. Synthetic fibers having openings with a basis weight of 1 to 50 g/m^2, which are formed by a mesh net having a large number of micro-occlusions of arbitrary shapes on at least one side of a wet paper sheet mainly made of cellulose fibers. A seedling-raising paper characterized in that sheets are made using a wet papermaking method.