JP2006336115A - Base paper for paper string, paper string and paper string net-like material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide base paper for a paper string, the paper string and a paper string net-like material having excellent environmental preserving properties, to provide the base paper for the paper string having excellent operation efficiency when twisted into the paper string and to provide the paper string having excellent operation efficiency when knitted into the paper string net-like material. <P>SOLUTION: The base paper for the paper string consists essentially of vegetable fibers, contains a lubricant and preferably has 0.15-0.50 coefficient of static friction. The paper string is composed of the base paper for the paper string. The paper string net-like material is composed of the paper string. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a paper string base paper, a paper string, and a paper string network.

  Paper cords have been used for water pulling, paper cloth, paper making, etc. since ancient times, but as a raw material for strings that are industrially produced without departing from the area of crafts, plant fibers such as hemp and cotton, polypropylene, Synthetic fibers such as polyethylene, nylon, and polyester are used. Those made of natural fibers such as cotton and hemp are much more expensive, and recently synthetic fibers are almost used. And, such a string is not only used for tying the string alone, but as a net-like knitted net, a storage body such as a bag, a net for vegetation, a net for plant cultivation, a net for construction work, Widely used in sports nets. However, when synthetic fiber is discarded, it is feared that gas will adversely affect the environment if it is incinerated, and if it is landfilled underground, it is difficult to decompose by microorganisms. Have a problem. In addition, synthetic fibers are made from fossil resources such as oil and coal, leading to resource depletion.

On the other hand, paper string nets using paper strings have been proposed from the viewpoint of environmental conservation (Patent Documents 1 to 5). Since the paper string is made by twisting paper mainly composed of plant fibers, the carbon dioxide generated during the combustion process is absorbed during the growth of the plant body and does not lead to an increase in the carbon dioxide concentration in the global environment. In addition, when landfilled in the ground, it is easily decomposed by microorganisms. However, when paper is twisted on a paper string or when a paper string is knitted into a net, it is easily caught by a member of a twisted string machine or a braided machine, making it difficult to run stably. There was a problem of wanting.
JP 2004-115957 A JP 2004-173568 A JP 2004-173886 A JP 2004-183417 A JP 2005-105511 A JP 59-173329 A Japanese Patent Laid-Open No. 10-1166 JP 2000-32852 A JP 2005-23483 A JP-A-52-143117

  To provide a base paper, a paper string, and a paper string net that are excellent in environmental conservation. Providing a base paper with excellent workability when twisted on a paper string. To provide a paper string excellent in workability when knitting into a paper string network.

  The paper string base paper of the present invention contains vegetable fiber as a main component and contains a lubricant (Claim 1). The lubricant is at least one selected from polyolefin, paraffin, wax, and alkyl ketene dimer systems (Claim 2). The paper string base paper of the present invention has a coefficient of static friction of 0.15 to 0.50 (Claim 3). The paper string base paper of the present invention contains a sizing agent (claim 4). The paper string base paper of the present invention contains a wet paper strength enhancer (Claim 5). The base string paper of the present invention has a tensile strength aspect ratio of 5 to 15 (claim 6).

   The paper string of the present invention is made of the paper string base paper, and the paper string network of the present invention is made of the paper string.

  Since the paper string base paper of the present invention is mainly composed of plant fibers, no harmful substances are generated even if it is incinerated when the paper string or paper string network using the fiber is discarded. Further, since carbon dioxide generated by combustion is absorbed by the plant body, the carbon dioxide concentration in the global environment is not increased. When landfilled in soil, it is decomposed by microorganisms and is excellent in assimilation into soil. Therefore, it is excellent in environmental conservation and human safety. Also, since no petroleum-based or coal-based synthetic fibers are used, fossil resources are not depleted.

The paper string base paper of the present invention will be described.
The paper string base paper of the present invention contains vegetable fiber as a main component.
Plant fiber is wood pulp, manila hemp pulp, sisal pulp, flax pulp, cotton pulp, cannabis pulp, jute pulp, three straw pulp, straw pulp, cocoon pulp, lint pulp, bamboo pulp, kenaf pulp, bagasse pulp, esparto pulp, walla pulp, Examples include waste paper pulp and rag pulp.
Wood pulp includes chemical pulp, semi-chemical pulp, thermomechanical pulp, mechanical pulp, and the like. The tree species may be coniferous or hardwood. Examples of the chemical pulp include kraft pulp and sulfite pulp, and any of bleached pulp and unbleached pulp can be used.
The vegetable fibers used for the paper string base paper of the present invention may be used alone or in combination of two or more.
Moreover, synthetic pulp, rayon fiber, synthetic fiber, etc. can also be used together. When used in combination, those having biodegradability are preferred.

  The plant fiber is preferably contained in an amount of 30% by weight or more, more preferably 50% by weight or more, and still more preferably 70% in the total fiber components in the paper string base paper so that the form of the paper string can be easily collapsed in the soil. It is contained at 90% by weight or more, particularly preferably 90% by weight or more.

  Further, when the strength of the paper string is required, it is preferable that the plant fiber has a large fiber length and a large aspect ratio (fiber length / fiber width). Examples of such plant fibers include softwood pulp, manila hemp pulp, sisal hemp pulp, flax pulp, cannabis pulp, jute pulp, trilobium pulp, straw pulp, husk pulp and the like. As the softwood pulp, chemical pulp is preferable, and kraft pulp is more preferable. When the strength of the paper string is necessary, 70% by weight or more of the above-described plant fiber having a large fiber length and aspect ratio is contained in the constituent material (fiber + filler) in the paper string base paper. Is preferable, 85% by weight or more is more preferable, and 100% by weight is particularly preferable. When the fiber length and the aspect ratio are large, the tensile strength in the machine direction is easily developed, and the longitudinal / lateral ratio of the tensile strength is easily set to 5 to 15.

  Moreover, “Japanese paper” manufactured since ancient times in Japan is also included as the paper string base paper of the present invention. For “Japanese paper”, three base pulp, straw pulp, manila hemp pulp, scabbard pulp and the like are used and have a specific strength. Both machine-suki Japanese paper and hand-made Japanese paper are included, and machine-suki Japanese paper using wood chemical pulp is also included.

  Plant fiber is beaten with a beater and used. As a beater, a beater, a conical refiner, a drum refiner, a single desk refiner, a double desk refiner, or the like can be used. The degree of beating is adjusted as appropriate according to the purpose, but it is easy to handle as slitter, twisted string, knitted mesh, paper string strength, paper string network strength, paper string or paper string network. In view of the above, the shopper freeness described in JIS P8121: 1995 is preferably 20 to 75 ° SR, more preferably 25 to 70 ° SR, and further preferably 30 to 60 ° SR. If the temperature exceeds 75 ° SR, the base paper becomes hard and the tear strength and tensile strength decrease. Therefore, the possibility of cutting in the twisted string process and the knitting process increases, and the workability decreases. And troubles such as insufficient strength and poor handling when used as a paper string net. If it is less than 20 ° SR, the tensile strength of the base paper is insufficient, and the slitting process, the twisted string process, and the knitted net process are likely to be cut, and the workability is reduced, and the strength as a paper string or a paper string net is also reduced. Cause problems.

   In addition, the paper string base paper of the present invention includes a sizing agent, a paper strength enhancer, a wet paper strength enhancer, a fixing agent, a water repellent, various fillers, a yield improver, a dye, and a color pigment as necessary. Etc. can also be used.

Since the paper string base paper of the present invention is required to be hardly wetted by water and hardly penetrated in most applications, it is preferable to contain a sizing agent. When used in combination with a wet paper strength enhancer, it also has an effect of enhancing the wet paper strength.
The sizing agent includes an internal sizing agent and a surface (external addition) sizing agent. Examples of the internal sizing agent include rosin-based internal sizing agents such as alkyl ketene dimer, alkenyl succinic anhydride, and synthetic polymer type.
The internal sizing agent is preferably a neutral sizing agent. The neutral sizing agent makes the pH of the base paper neutral, prevents deterioration of the base paper due to light and heat, and enables long-term use as a paper string and paper string network. Neutral sizing agents are mainly alkyl ketene dimer, alkenyl succinic anhydride, and synthetic polymer, but rosin can also be used.
As surface sizing agents, there are many synthetic polymer type surface sizing agents, but alkyl ketene dimer systems can also be used as surface sizing agents.
Among the various sizing agents, the alkyl ketene dimer system has a function as a lubricant both in the internal addition and in the external addition.

  The amount of the internal sizing agent added is preferably 0.1 to 1.5% by weight, more preferably 0.1 to 1.0% by weight, based on the constituent material (fiber + filler), More preferably, it is 0.1-0.7 weight%. If it is less than 0.1% by weight, sufficient water resistance cannot be obtained, and if it exceeds 1.5% by weight, the amount of addition becomes excessive, and the effect of improving water resistance is not improved, and the balance with other additives is not correct. As a result, there are problems such as aggregation of fibers and generation of floating seeds, or reduction of the effect of other additives (for example, wet paper strength enhancer).

  It is preferable to use a wet paper strength enhancer in the paper string base paper of the present invention as necessary. When the paper string or paper string net of the present invention is used outdoors, or when it is used for applications that get wet with water, for example, a net for vegetation, a net for plant cultivation, a net for building construction, a net for sports, etc. It is necessary to maintain the strength even when water is infiltrated. In particular, when used for a net for construction work or a net for outdoor sports, it is necessary to use a wet paper strength enhancer.

  In this case, the wet paper strength enhancer is not particularly limited, but may be polyamide epichlorohydrin resin, epoxy resin, melamine resin, urea resin, dialdehyde starch, polyacrylamide resin, polyethyleneimine, and the like. At least one selected can be suitably applied to the present invention. Of these, polyamide epichlorohydrin resins and melamine resins can be preferably used.

The use amount of the wet paper strength enhancer is preferably 0.1 to 2.5% by weight, more preferably 0.15 to 1.5% by weight, and more preferably 0.2 to 1% with respect to the constituent material (fiber + filler). More preferred is 0.0% by weight. If it is less than 0.1% by weight, the wet paper strength will be insufficient, causing problems in use. On the other hand, even if it is used over 2.0% by weight, it does not fix to the constituent material and it simply increases the cost, but the balance of the additives in the paper stock is out of order and the pulp is agglomerated to deteriorate the texture, It brings about adverse effects such as generation of bubbles and floating seeds and reduction of the effect of other additives (for example, sizing agent).
In addition, in the external addition, wet paper strength can also be imparted by including a water-resistant agent in the coating solution.
Examples of the water-proofing agent for coating include melamine resin, urea resin, glyoxal, epoxy polyamide resin, and dialdehyde starch.

  The paper string base paper of the present invention needs to contain a lubricant. By including a lubricant, slipperiness can be imparted to the base paper and the paper string, and the running can be stabilized without being caught by the twisted string machine or the braided net machine, and the cutting of the base paper tape in the twisted string process or the knitted net process Cutting the paper string can be prevented. In particular, in the knitting net process, a strong force is often applied, and it is important that it is difficult to cut.

  Examples of the lubricant include compounds such as polyolefin (such as polyethylene), paraffin, wax, silicone, alkyl ketene dimer, fluorine, fatty acid, fatty acid ester, and fatty acid metal salt. Of these, polyolefin, paraffin, wax, and alkyl ketene dimer systems are preferred. Of the polyolefins, polyethylene is preferred. The lubricant can be appropriately selected from commercially available release agents, water repellents, dusting inhibitors, sizing agents, and the like, but is not limited thereto.

The method of incorporating the lubricant is not limited to internal or external addition, and may be used in combination.
The external addition method may be on-machine processing or off-machine processing, but is preferably on-machine processing from the viewpoint of manufacturing cost.
For on-machine treatment, a size press, a gate roll coater, a metering size press, a bill blade coater, or the like can be used.
For off-machine treatment, a roll coater, a Mayer bar coater, a blade coater, an impregnation machine, or the like can be used.

In the case of external addition, the coating amount of the lubricant is preferably 0.005 to 2.0 g / m ² and more preferably 0.01 to 1.5 g / m ² with respect to the base paper before coating. Preferably, it is 0.01-1.0 g / m < ² >. If it is less than 0.005 g / m ² , the effect of imparting slipperiness to the base paper is small. If it exceeds 2.0 g / m ² , the base paper slips too much, which not only hinders the base paper winding process, base paper slitting process, twisted string process, and knitting net process, but also makes it difficult to handle as a paper string and a net-like body. .

 For externally added coating liquid, surface sizing agent, water repellent, surface paper strength enhancer, water resistance agent, pigment, low resistance treatment agent (antistatic agent), softening agent, anti-mold, if necessary An agent, an antibacterial agent, a pigment, a colorant, a flame retardant and the like can be mixed and applied.

  In the case of internal addition, the addition amount of the lubricant is preferably 0.1 to 1.5% by weight, more preferably 0.1 to 1.0% by weight with respect to the constituent material (fiber + filler). Preferably, it is 0.1 to 0.7% by weight. If it is less than 0.1% by weight, sufficient slipperiness cannot be obtained, and if it exceeds 1.5% by weight, the amount of addition becomes excessive, and the effect of improving slipperiness is not improved, and the balance with other additives is out of order. As a result, problems such as aggregation of fibers and generation of floating seeds are caused, and the effect of other additives (for example, wet paper strength enhancer) is reduced.

  The internal lubricant preferably has an effect as a sizing agent, and an alkyl ketene dimer system is particularly preferable. It is particularly preferable to use an alkyl ketene dimer system for internal addition and a polyethylene system or paraffin system for external addition.

 Furthermore, the fixing agent is added in the paper making process to reduce the loss of fine fibers, chemicals, fillers, etc., to improve the yield and to effectively use the chemical. For example, an organic polymer electrolyte typified by polyacrylamide is used. In addition, inorganic salts typified by aluminum sulfate (sulfate band) can be applied to the paper string base paper of the present invention.

In the present invention, it is preferable to use a sticky agent as necessary for the control of the dispersibility of the stock and the freeness. By controlling the dispersibility and freeness of the paper stock, it is possible to improve the formation of the paper string base paper. A good texture means that the distribution of the constituent materials (fiber + filler) in the paper string base paper is uniform, the strength of the base paper is improved, and a uniform paper string is obtained. Improves. Furthermore, it is easy to handle paper strings and paper string nets.
Examples of mucous agents include mucus obtained from plants such as troro-aoi, and water-soluble synthetic polymers such as high molecular weight polyethylene oxides and polyacrylamides. Molecules are preferred.
Among water-soluble synthetic polymers, polyethylene oxide is not preferable because it causes foaming of the stock solution or makes it difficult to obtain the strength of the paper. In the present invention, it is preferable to use a polyacrylamide system which has no foaming property and tends to enhance the strength of paper.
The addition amount of the sticking agent is preferably 0.1 to 1.5% by weight, preferably 0.5 to 1.3% by weight, and 0.7 to 1.2% by weight with respect to the constituent material (fiber + filler). Is more preferable. If it is less than 0.1% by weight, the effect is insufficient, and if it exceeds 1.5% by weight, the viscosity of the slurry becomes too high, resulting in problems such as poor dispersion and poor drainage.

Next, the physical characteristics of the paper string base paper of the present invention will be described.
The basis weight of the paper strap sheet of the present invention is preferably from 15 to 80 g / ^{m 2,} is more preferably from 20 to 50 g / ^{m 2,} more preferably from 25 to 45 g / ^{m 2,} It is especially preferable that it is 30-45 g / m < ² >. If the basis weight is less than 15 g / m ² , the base paper tape is easily cut when twisted, and if it exceeds 80 g / m ² , the rigidity becomes high and it becomes difficult to twist a particularly thin paper string.

The thickness of the paper string base paper of the present invention is determined by the basis weight and density.
The density of the paper strap sheet of the present invention is preferably 0.50~0.80g / cm ^3, more preferably 0.55~0.75g / cm ^3, 0.60~0.70g More preferably, it is / cm ³ . If the density is less than 0.50 g / cm ³ , the base paper is bulky and it is difficult to make a uniform paper string. In addition, the paper string or the paper string net is soft and is not suitable for applications that require hardness. If it exceeds 0.80 g / cm ³ , the base paper becomes hard and it is difficult to form a uniform paper string. Further, it is difficult to process into a paper string or a paper string net. Furthermore, it becomes difficult to handle as a paper string or a paper string net.

The static friction coefficient of the paper string base paper of the present invention is preferably 0.15 to 0.50, more preferably 0.20 to 0.45, and further preferably 0.25 to 0.40. preferable. When the coefficient of static friction is less than 0.15, the base paper slips too much, and not only the workability is reduced in the base paper winding process, slitting process, twisting string process, and knitting netting process, but also when used as a paper string or net-like body. It becomes difficult to handle. In particular, in the slitting process, the tape-shaped small roll is liable to be laterally displaced and the workability is poor. When the static friction coefficient exceeds 0.50, it becomes easy to get caught in the twisted string process and the knitting net process, and the running is disturbed and the cutting is likely to occur. In particular, since a strong force is applied in the knitting net process, the paper string is easily cut.
The static friction coefficient can be controlled by appropriately adjusting the type and amount of lubricant.
For example, when the external addition of polyethylene is preferably 0.005~0.20g / ^{m 2} relative to the coating before the base paper, more preferably 0.01~0.15g / ^{m 2} 0.01 to 0.10 g / m ² is more preferable.
When externally added paraffinic is preferably 0.01 to 2.0 g / ^{m 2} relative to the coating before the base paper, more preferably 0.20~1.0g / ^{m 2,} More preferably, it is 0.30-0.90 g / m < ² >.
When the alkyl ketene dimer system is internally added, it is preferably 0.1 to 1.5% by weight, more preferably 0.1 to 1.0% by weight, based on the constituent materials (fiber + filler). Preferably, it is 0.1 to 0.7% by weight.
When a plurality of types of lubricants are used in combination, it may be adjusted as appropriate in consideration of a synergistic effect.
Yes.

The longitudinal tensile strength of the paper string base paper of the present invention is preferably 50 N / 15 mm or more, more preferably 70 N / mm or more, and even more preferably 100 N / 15 mm or more. If the tensile strength in the longitudinal direction is less than 50 N / 15 mm, the paper may be cut in the base paper slitting process and the twisted string process, and the paper string may be cut in the knitting netting process.
The tensile strength in the transverse direction is preferably 5 N / 15 mm or more, and more preferably 8 N / 15 mm or more. If the tensile strength in the transverse direction is less than 5 N / 15 mm, the tape-shaped base paper may be split vertically in the twisted string process.

In the paper string base paper of the present invention, the ratio of the tensile strength in the vertical direction to the tensile strength in the horizontal direction (longitudinal / lateral ratio) is preferably 5 to 15, more preferably 7 to 15, More preferably, it is 15. When the tensile strength aspect ratio is less than 5, when slitting into a tape shape from the base paper, there is a risk of paper breakage at the time of twisted cord, and the strength of the paper cord is reduced, which is sufficient for the knitted mesh This causes problems such as inability to apply a strong tension and hindering the efficiency of the knitting net process, and inability to withstand a strong load when used as a paper string net. On the other hand, if it is larger than 15, when it is slit into a tape shape, there is a risk of tearing in the longitudinal direction at the time of the twisted string, and the rigidity in the longitudinal direction of the base paper becomes too large, making it difficult to twist the paper string, The string becomes too rigid and difficult to wind or knitted. Moreover, it becomes difficult to handle when using a paper string net.
In order to adjust the aspect ratio in the range of 5 to 15, it is preferable to use vegetable fibers having a large fiber length and aspect ratio, and to make paper using a forward-flow circular net paper machine. Press part, dryer part It is more preferable to take a large draw.

  The wet tensile strength in the longitudinal direction of the paper string base paper of the present invention is preferably 15 N / 15 mm or more, more preferably 20 N / 15 mm or more, and further preferably 23 N / 15 mm or more. When the wet tensile strength is less than 15 N / 15 mm, it cannot be used outdoors, especially for sports nets and building construction nets.

The sizing degree (Stichtite sizing degree) of the paper string base paper of the present invention is preferably 3 seconds or more, more preferably 5 seconds or more, and further preferably 7 seconds or more. If the sizing degree is less than 3 seconds, it is difficult to use for an inconvenient application when wet with water.
The PH of the paper string base paper of the present invention is preferably 5.7 to 10.0, and more preferably 6.0 to 9.0. If the pH is less than 5.7, it tends to be deteriorated by light or heat, and if it exceeds 10.0, deterioration of hemicellulose in the fiber is promoted.

The manufacturing method of the paper string base paper of this invention is demonstrated.
The paper string base paper of the present invention is manufactured by making a slurry of a papermaking raw material in which the above-mentioned various additives are sequentially blended at a predetermined ratio into the above-mentioned slurry containing vegetable fibers as a main component, using a wet paper machine. .
The order of addition of the additives is important in order for the additives to work effectively. In the present invention, the order of wet paper strength enhancer → size agent → (fixing agent) → viscous agent is preferred. The externally added lubricant is added by the method described in [0021].
The wet paper machine for making the paper string base paper of the present invention is not particularly limited, such as a long net paper machine and a circular net paper machine, which are applied to general paper making technology, but the strength required for the paper string base paper, In particular, in order to ensure sufficient tensile strength in the longitudinal direction and to make the tensile strength aspect ratio to 5-15, plant fibers with a large fiber length and aspect ratio are used. It is preferable to use a circular paper machine with a forward flow type bat, and it is preferable to draw a large amount in the press part and the dryer part. The dryer is preferably a multi-cylinder dryer with many draw adjustment points.
The paper string base paper of the present invention may be a single-layer paper or a laminated paper of two or more layers, and a double-layer paper or more is preferable because it becomes a more uniform base paper.

Next, the paper string and paper string net of the present invention will be described.
The base paper obtained by the above paper making process is slit to a width of 5 to 50 mm and a winding length of about 500 m to be tape-shaped and wound into a small width. To be processed. The paper string of the present invention is preferably produced from one base paper tape from the viewpoint of cost, but some may be knitted and used as necessary. The thickness of the paper string is not particularly limited, but a diameter of about 1 to 10 mm is preferable in terms of ease of handling and ease of knitting.

In order to produce the paper string net of the present invention using the paper string of the present invention obtained in the above process, it is made into a knotted network or a knotless network by a normal net manufacturing technique using a knitting netting machine. What is necessary is just to knit. Further, it may be woven into a mesh shape or a woven shape.
The paper string net of the present invention is particularly preferably a knotless net. The knotless net is easy to handle in use because it has no knots, the connecting portion is planar, and is light and not bulky. The net can be partially repaired, and the workability is good. Further, since the knotless net is accurate and has no drop, the appearance is good when it is made of a paper string net. Furthermore, since the knotless net has no knots, it has an advantage that the connecting portion is easily disassembled and assimilated to the soil when landfilled in the soil after use, compared to the knotted net.

  Examples of a knotless network applicable to the paper string net of the present invention are given as FIGS. That is, FIG. 1 is called a penetration type and has a structure in which the yarns of two mesh yarns cross each other, and the mesh yarn has a structure extending linearly through the connecting portion. FIG. The net yarn has a zigzag structure that is crossed 2 to 3 times, and Fig. 3 shows a tortoiseshell-type cross and 2 to 3 cross yarns. The net yarn has a structure that extends linearly through the connecting portion. FIG. 4 is called a Russell net, which is a net made of a so-called “lace net”, and FIG. The warp yarn is twisted and the weft yarn is meshed between them, and FIG. 6 is a warp screen (improved moist net) and the twisted weft yarn is used to reduce the misalignment. In FIG. 7, the yarn is simply crossed by a woven mesh. All of these are embodiments of the paper string net of the present invention, and can be appropriately selected depending on the application.

The paper string network of the present invention may be coated or impregnated with a resin component as necessary for the purpose of imparting water resistance or improving physical strength. The application or impregnation of the resin component in this case may be performed in advance on the stage before processing into a net, that is, on a paper string or base paper.
Further, other function-imparting agents, for example, an ultraviolet absorber or a flame retardant may be contained in order to increase the weather resistance outdoors.

  Hereinafter, the present invention will be described in more detail with reference to examples. The present invention is not limited to these. Moreover, the addition amount of the internal additive is weight% of the solid content of the internal additive with respect to the pulp weight.

The raw materials used are as follows.
・ Pulp: Pulp A ・ ・ Conifer bleach bleached kraft pulp from North America (NBKP)
Pulp B ·· South American softwood unbleached kraft pulp (NUKP)
Pulp C ... Waste paper pulp Internal sizing agent: Internal sizing agent A
(Product name “Size Pine K-287”, manufactured by Arakawa Chemical Co., Ltd.)
Internal sizing agent B ・ ・ Rosin
(Product name "Size Pine E", manufactured by Arakawa Chemical Co., Ltd.)
-Wet paper strength enhancer: Polyamide epichlorohydrin resin
(Product name "Polyfix 301" manufactured by Showa Polymer Co., Ltd.)
・ Fixing agent: Aluminum sulfate (sulfate band)
・ External lubricant: External lubricant A ・ ・ Polyethylene release agent
(Product name "Nopcoat PEM-17" manufactured by San Nopco)
External lubricant B ... Paraffinic water repellent
(Product name "WR3908", manufactured by Hoshimitsu PMC)

<Example 1>
Pulp A [North American softwood bleached kraft pulp (NBKP)] was beaten to 40 ° SR with a double describner to form an aqueous slurry, and a wet paper strength enhancer made of polyamide epichlorohydrin resin (made by Showa Polymer Co., Ltd. Fix 301 ") 0.3% by weight, sizing agent A [alkyl ketene dimer system (trade name" Size Pine K-287 "manufactured by Arakawa Chemical Co., Ltd.)] 0.3% by weight, polyacrylamide type synthetic viscosity agent (Dyanitrix) (Product name “Acrypers PS”) 1.0% by weight is added in the above order, and applied to a forward-flow type circular net paper machine to produce a base paper having a two-layer structure with a basis weight of about 38 g / m ^2. did. Lubricant A [polyethylene release agent (manufactured by San Nopco, trade name “Nopcoat PEM-17”)] was applied to the base paper with a size press so that the solid content was 0.05 g / m ² . Paper base paper was prepared.

<Examples 2 to 13 and Comparative Examples 1 to 3>
Paper base papers of Examples 2 to 13 and Comparative Examples 1 to 3 were prepared in the same manner as in Example 1 with the raw material composition shown in Table 1. In addition, the addition order of the additives of Examples 8, 12, and 13 and Comparative Examples 1 to 3 is the order of wet paper strength enhancer → size agent B → sulfuric acid band → viscous agent.
In Comparative Examples 1 to 3, no lubricant was used in both internal and external additions.

The physical properties of the paper string base papers of Examples 1 to 13 and Comparative Examples 1 to 3 were measured and shown in Table 1.
The measuring method of each physical property is as follows. In addition, the standard state for the humidity control and test of the sample is based on JIS P8111: 1998.
-Basis weight: JIS P8124: 1998
・ Thickness: JIS P8118: 1998
Density: JIS P8118: 1998
-Coefficient of static friction: JIS P8147: 1994, 3.1
・ Tensile strength: JIS P8113: 1998
-Wet tensile strength: JIS P8135: 1998-Soaking time 20 minutes-Degree of sizing: JIS P8122: 2004
・ PH: JIS P8133: 1998, 7.1

Next, the base papers of Examples 1 to 13 and Comparative Examples 1 to 3 were slit into a strip shape having a width of 40 mm using a bobbin winder.
The slit property was evaluated from the points of running property, presence or absence of paper cutting, winding property, etc., and the results are shown in Table 1. The evaluation criteria are as follows.
○: No problem, Δ: Some problem but practical use, ×: Trouble in work.

The slit-processed tape-like base paper was set in a twisted string machine and twisted 28 times / 30 cm to produce a paper string having a diameter of 3 mm.
The twisted string characteristics were evaluated in terms of running properties, presence / absence of cutting, winding property, and the like, and the results are shown in Table 1. The evaluation criteria are as follows.
○: No problem, Δ: Some problem but practical use, ×: Trouble in work.

The paper string was subjected to a commercially available knitting netting machine to produce a knotless net having a through-hole type and a low opening ratio as shown in FIG.
The knitting properties of the knitting machine were evaluated in terms of running properties, presence or absence of cutting, and the results are shown in Table 1. The evaluation criteria are as follows.
○: No problem, Δ: Some problem but practical use, ×: Trouble in work.

It was confirmed that the paper string base paper of the present invention has excellent processability at the time of slitting, twisting string, and knitting.
The base papers of Comparative Examples 1 to 3 were slightly unstable in running properties when twisted, and the paper cords were frequently cut during knitting, resulting in poor workability and unsuitable for industrial mass production.

The paper string base paper of the present invention can industrially mass-produce paper strings and paper string nets without causing troubles in the slitting process, the twisting string process, and the knitting mesh process.
The paper string of the present invention can also be used as a string for binding. It can also be used for packaging paper bands. If it is in the form of a hollow string, it can also be used for tatami mat materials. It can also be used for crafts and paper cloth.
The paper string net of the present invention can be widely used for vegetation nets, plant cultivation nets, storage bodies (bags, etc.), building construction nets, sports nets, and the like.

An example of the paper string net of the present invention: plan view of a through-type knotless net Example of paper string net of the present invention: plan view of a staggered knotless net Example of the paper string net of the present invention: plan view of a turtle shell-shaped knotless net Example of paper string net of the present invention: plan view of a Russell net An example of the paper string net of the present invention: a plan view of a regular net Example of the paper string net of the present invention: plan view of an improved string net An example of a paper string net of the present invention: a plan view of a knotless net made of a woven net

Claims (8)

A paper string base paper characterized by comprising vegetable fiber as a main component and containing a lubricant. The paper base paper according to claim 1, wherein the lubricant is at least one selected from polyolefin, paraffin, wax, and alkyl ketene dimer systems. The paper string base paper according to claim 1 or 2, wherein a static friction coefficient is 0.15 to 0.50. The paper string base paper according to any one of claims 1 to 3, further comprising a sizing agent. The paper string base paper according to any one of claims 1 to 4, further comprising a wet paper strength enhancer. The string base paper according to any one of claims 1 to 5, wherein the tensile strength has an aspect ratio of 5 to 15. A paper string comprising the paper string base paper according to any one of claims 1 to 6. A paper string network comprising the paper string according to claim 7.

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