JP3036729B2 - Circular mesh cylinder or dandy roll for producing transparent patterned paper and method for producing them - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mesh cylinder or a dandy roll used for producing a transparent patterned paper, and a method for producing the same.

[0002]

2. Description of the Related Art A pattern paper having a paper with an embossed pattern is well known. The method of manufacturing the paper is a papermaking net on which a pattern such as a pattern or a character is attached, or a mesh made of resin such as a mesh. A method of applying transparency to paper using a paper net filled with, a paper net with an embossed pattern, patterns on the dandy roll on the wire part of a fourdrinier paper machine A method of attaching a shape, filling the mesh of the mesh in a pattern shape, punching the mesh itself into an uneven pattern shape, pressing it against a sheet of paper, and shaping it, wet paper formed by the wire part of the paper machine on felt In the middle of holding and transporting with
A method of transferring the felt pattern to wet paper by the nip pressure of a press roll or suction roll, etc., and pressing the wet paper with an embossing roll with a pattern engraved on the surface after the press part of the paper machine. A typical method is a molding method, such as a dry embossing method in which paper is once dried and then pressed and shaped between rolls on which patterns are engraved.

[0003]

In order to manufacture a patterned paper by the above-mentioned method, it is necessary to design and manufacture a papermaking net or a felt or embossing roll having a desired pattern. The production of these netting patterns, felts and embossing rolls always involves enormous amounts of time, production costs and technical difficulties. In addition, in order to produce many different types of patterned paper, it is necessary to produce and replace nets or felts or embossing rolls each time. The production method was not suitable for producing a wide variety of products in lots.

In order to solve these drawbacks, the present inventors have found that laces commonly used in curtains and the like have complicated and diverse patterns, have specific gaps, and are optimal for papermaking nets. Focusing on the fact that the manufacturing method is simple and relatively inexpensive, a method of manufacturing a transparent patterned paper by integrally fixing and joining a lace to a paper net of a circular net paper machine or an upper net of a dandy roll. It was proposed in Japanese Patent Application No. 1-324765.

[0005] In this application, as a method of fixing a lace composed of delicate yarns and having complicated and various designs to an upper net for a dandy roll used in a paper net for a circular net paper machine or a fourdrinier paper machine or the like. He stated that conventional means such as soldering, sewing, and bonding with an adhesive can be arbitrarily used depending on the material and pattern of the lace.

As a result of further studies, the present inventors have proposed Japanese Patent Application No. 3-168755. The gist of this application is to impregnate the resin liquid by dipping, coating or spraying it into a lace, then blow off the resin liquid pool or unnecessary resin liquid by high-pressure air flow, and then dry the pattern. An object of the present invention is to obtain a resin processing race for paper production.

In this application, a method of applying a heat-sensitive adhesive to a net in advance, pressing a resin-processed lace against the net, activating the heat-sensitive adhesive with an iron or the like, and thermally bonding the net to the lace, Was heated with hot air or an infrared lamp to activate and bond the heat-sensitive adhesive.

In order to use a lace made by intricately braiding delicate yarns as a papermaking net, the lace must be integrally fixedly joined to the upper net of a circular net cylinder or the upper net of a dandy roll. If the upper net for papermaking and the lace are not fixedly joined together, the paper stock will be entrapped between the upper net for papermaking and the lace during papermaking, making papermaking impossible. Japanese Patent Application No. 168755/1991 proposes that the yarns constituting the lace be sufficiently resin-processed in order to join the upper net for papermaking and the lace sufficiently and integrally. Applying a certain amount of resin to the lace yarn closes the fine gaps, and has the disadvantage that the pattern is deformed and a clear transparent pattern cannot be obtained. In addition, the above method of applying the heat-sensitive adhesive to the net has a disadvantage that the adhesive remains on the net when the resin-processed lace is changed, and a great deal of labor is required for removing the adhesive. Specifically, even if the adhesive remaining on the net is removed with an organic solvent, the adhesive that has entered the mesh does not easily elute, and it is necessary to carefully scrape it using a fine brush or the like, This work takes a long time,
There were also problems with health and safety.

[0009] Further, the lace is directly fixedly joined to a paper net for a round paper machine or an upper net of a dandy roll.
Japanese Patent Application No. 324765 and Japanese Patent Application No. 3-168735 use a lace made by intricately knitting delicate yarns as a papermaking net. Although it was a target, the race was processed with resin and the adhesive was used to fix the race, so the expressive power expected of the race was not fully exhibited.
An object of the present invention is to provide a mesh cylinder or dandy roll for producing a transparent patterned paper which solves these drawbacks.

[0010]

According to the present invention, there is provided a sheet-like material having a through hole-like gap and having heat-activated adhesiveness on the surface of a papermaking net for a round paper machine or an upper net for a dandy roll. A mesh cylinder or dandy roll for producing a transparent patterned paper, wherein the lace is fixedly joined and a lace is fixedly joined to the surface of the sheet-like material.
Further, the present invention also provides a sheet-forming material for a wire-making machine or an upper net for a dandy roll, on which a sheet-like material having a perforated gap and having heat-activated and adhesive properties is laminated, and heated to form a sheet-forming material. A circular mesh cylinder for producing a transparent patterned paper, wherein a papermaking net for a machine or an upper net for a dandy roll is fixedly joined to the sheet-like material, and then a lace is overlaid thereon and the lace is fixedly joined by heating. Alternatively, it is a method of manufacturing a dandy roll. In addition, the present invention, on the surface of a paper net for a round paper machine or an upper net for a dandy roll, a sheet-like material having a perforated gap and activated by heat and exhibiting adhesiveness is sequentially laminated with a lace, and heated. A method for manufacturing a mesh cylinder or a dandy roll for producing a patterned paper, characterized by fixing and joining together a sheet net and a lace for a round paper machine or an upper net for a dandy roll.

As the sheet-like material used in the present invention, which has a perforated gap and is activated by heat and exhibits adhesiveness, for example, the following materials can be used. If the sheet-shaped material does not have a perforated gap, as will be described later in detail, the paper material becomes clogged in the lace during paper making, and it becomes impossible to produce a transparent paper. 1) Woven fabric or knitted fabric composed of heat-adhesive fibers There are examples in which heat-adhesive fibers are used as binders for non-woven fabrics (for example, "From synthetic paper to functional paper", pp. 1287-, October 25, 1988, Uni Publishing Co., Ltd.) See company publishing). Polyethylene-based, polypropylene-based, polyester-based, polyvinyl chloride-based, and the like are known as the heat-adhesive fibers. In the present invention, these heat-adhesive fibers are used to form a woven fabric having a perforated gap. Although the knitted fabric is manufactured and used by a known method, there is no known example of using the heat-adhesive fiber for the purpose of the present invention.

2) A network made of a thermoplastic resin A thermoplastic resin which is partially melted by heating and exhibits adhesiveness, for example, a resin such as a polyethylene, polypropylene, polyester or polyvinyl chloride resin is used. To produce and use a mesh having a perforated gap.

3) Fabric-like material processed with thermoplastic resin Perforation using synthetic fibers such as polyester and nylon, and natural fibers such as hemp, cotton and wool, which are excellent in water resistance, durability and resin processability. Weave a knitted or woven fabric with a gap
We make from knitting, braids. The thickness, number of threads, and shape of the yarn can be freely selected and combined depending on the product to be manufactured and the paper net used. The knitted or woven fabric obtained by processing a thermoplastic adhesive is used. In the present invention, various materials and shapes can be easily obtained as a sheet-like material having a perforated gap and being activated by heat and exhibiting adhesiveness, and the adhesive can be easily processed. It is preferable to use a knitted or woven fabric having a perforated gap. In particular, it is preferable to use a woven fabric manufactured by tangled weave. This will be described later in detail with reference to the drawings.

Processing of the adhesive into a knitted or woven fabric is carried out by conventional means such as impregnation, coating, and spraying. The thermoplastic adhesive used can be any of a water-based and a solvent-based.Polyvinyl chloride, polyvinyl acetate, polyolefin resin, styrene resin, acrylic resin, polyamide resin, phenol resin, melamine resin,
Epoxy resins, polyurethane resins, polyester resins and other synthetic and natural rubbers can be used in the form of resins such as aqueous solutions, organic solvent solutions, emulsions and latexes. An air flow is used to eliminate local accumulation and clogging of the resin liquid after processing. The knitted or woven fabric is processed with the adhesive in the above-described manner, and while the adhesive is still fluid, a high-pressure air stream blows away a local pool of the adhesive or unnecessary adhesive, and Eliminate clogs,
Then dry.

[0015] The air flow is generated using an air flow generating device such as a compressor, a fan or a blow. The use of a compressor has the advantage that a high-pressure air flow can be easily obtained. In this way, the adhesive is applied to the knitted or woven fabric to remove unnecessary resin liquid, and then dried with hot air to produce a knitted or woven fabric for bonding. The amount of the resin impregnated into the knitted or woven fabric is adjusted depending on the thickness of the knitted or woven fabric, the weight per unit area, the design, the material, and the like, but is usually in the range of 3 to 300% by dry weight.

The race used in the present invention is disclosed in Japanese Patent Application No. Hei.
The race proposed in 68753 can be used as it is.
In other words, lace is a generic term for products that form a perforated pattern by forming yarns with a certain structure and the density of the gaps, and also include laces that are embroidered on a base cloth such as cloth, netting, etc. (Kodansha: Encyclopedia of Contemporary World Encyclopedia, 1972, Vol. 3, p. 944). In the present invention, the material of the yarn for producing the lace is not particularly limited, and any of a metal fiber such as bronze and stainless steel, a synthetic fiber such as nylon and polyester, and a natural fiber such as cotton, hemp and wool are used. it can.

The lace can be manufactured by using a known manufacturing method. Typical methods include embroidery (making holes in the cloth stretched over the frame, sewing with the front and back threads, and making openwork laces), and chemical (animal fiber or water-soluble). After embroidering with a thread on a basic cloth knitted with synthetic fiber, dissolve and remove only the basic cloth with a chemical solution, leaving only the thread part), knitting method (knitting with a knitting machine such as a Raschel knitting machine), etc. Any of these can be used in the present invention. In order to impart shape retention and durability to a pattern lace for forming a see-through pattern, resin processing can also be performed. The resin processing can be performed using the same material and method as the adhesive processing for knitted or woven fabric described later.

Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 shows a perspective view of an example of a mesh cylinder 1 used when the present invention is carried out by a mesh paper machine, and a lace 2 is formed by processing a thermoplastic adhesive into a perforated knitted fabric having a gap. Alternatively, it is manufactured by being fixedly joined to the papermaking net 4 via the woven fabric 3. FIG. 2 shows a perspective view of an example of the dandy roll 10 used when the present invention is carried out by a fourdrinier paper machine. The lace 20 is formed by processing a thermoplastic adhesive into a knitted fabric having a perforated gap. It is manufactured by being fixedly joined to the upper net 40 via the fabric 30.

FIG. 3 is a partially enlarged plan view of the surface of another example of the cylinder cylinder of the present invention, and FIG. 4 is a partially enlarged sectional view of the same. This is an example in which a knitted fabric having a perforated gap formed by processing a thermoplastic adhesive or a woven fabric 3 produced by entangled weaving is used. A woven fabric is generally formed by crossing a normal warp (Tateto) and a weft (Yokoto) at right angles, and warps and wefts are parallel. On the contrary, garami weave (Mojiri)
The warp is also structured by changing the position of the warp to the left and right of the ground warp by one or several wefts. Since the woven fabric manufactured by Karamimi weave has such a configuration,
As shown in FIG. 4, the cross section is much flatter than that of the paper web 4, and when a physical force is applied, the thread is less likely to be displaced and the through-hole-shaped gap is not broken. Since the woven fabric woven by garami weaving has such characteristics, the circular mesh cylinder or dandy roll of the present invention using the woven fabric is displaced by the fixedly bonded race 2 even after long-term operation. It is excellent in the effect that the see-through is uniformly applied without any.

In order for a mesh cylinder or a dandy roll to function for producing a patterned paper, it is important to drain the water during papermaking. Specifically, the number of meshes of a paper net for a round paper machine or an upper mesh for a dandy roll, and the number of meshes of a sheet-like material having a perforated gap formed thereon and activated by heat and exhibiting adhesiveness, In addition, the overall balance with the number of races above is important. As an example, when the number of laces on the outermost layer is large (fine), the number of meshes in a sheet-like material having a perforated gap and activated by heat and exhibiting adhesiveness is reduced. (Roughening). When the number of races in the outermost layer is small (coarse), the number of holes in the sheet-like material having perforated gaps and activated by heat and exhibiting adhesiveness is increased (to be finer). ). By doing so, the drainage of the whole mesh cylinder or dandy roll for producing a see-through patterned paper is well controlled so as to be suitable for the see-through. The number of meshes of the paper net for the circular net paper machine or the upper net for the dandy roll differs depending on the paper to be produced, but usually a mesh of 90 to 40 mesh is used.

[0021] The fixed joining of the sheet-like material having a perforated gap and activated by heat and exhibiting adhesiveness to a circular net or a net on a dandy roll is performed by heating the sheet-like material with an iron, hot air, an infrared lamp or the like. Then, it is activated, fixedly bonded to the net, and then the lace is placed thereon and activated in the same manner, and fixedly bonded to the lace. Alternatively, on the surface of a paper net for a circular net paper machine or an upper net for a dandy roll,
Lacing is performed through a sheet-like material having a through-hole and activated by heat and exhibiting adhesiveness, and then heated and activated in the same manner to form a net for a round paper machine or an upper net for a dandy roll. A sheet-shaped material that has heat-activated adhesiveness with a hole-shaped gap and a heat-activated sheet-shaped material that has heat-activated adhesiveness with a hole-shaped gap and is bonded and fixed to each other They may be joined.

In order to manufacture a transparent paper pattern paper using the mesh cylinder or dandy roll of the present invention, the mesh cylinder 1 as illustrated in FIG. 1 is placed at a predetermined position in a bat of a mesh paper machine. Or make paper based on the ordinary law,
Alternatively, a dandy roll 10 as illustrated in FIG. 2 is installed and oscillated in a process of forming a wet paper web on a wire part of a fourdrinier paper machine or the like, so that the wet paper web is permeated and dried by a conventional method.

[0023]

EXAMPLES Example 1 (Production Example of Circular Mesh Cylinder) Raschel Marquisette's tangled weave grid-like curtain lace using polyester multifilaments (trade name “Lilycolor 50821, thickness 0.35 mm,
Water-dispersible urethane resin (concentration 30%, trade name "VONDIC") was added to 19 warps and 18 wefts per inch.
1670 (N) ", manufactured by Dainippon Ink and Chemicals, Inc.) 10
0 parts by weight, melamine resin (concentration 80%, trade name "BEC
KAMINPM-N ”, manufactured by Dainippon Ink and Chemicals) 1
0 parts by weight, catalyst (trade name “CATALYST376”,
Impregnated with an adhesive obtained by mixing 1 part by weight of Dainippon Ink and Chemicals, 50 parts by weight of water, and using an excess adhesive with a pistol-type air gun (trade name “Air Duster K605-DX”,
Compressor pressure 1-2kg / c manufactured by KINKI
m ² , and dried with hot air at 120 ° C. to produce an adhesive-processed fabric. The above-mentioned woven fabric, which had been processed with an adhesive, was pressed against the upper net (bronze) of the net cylinder of a net paper machine while being heated with a drier, and adhered. From above, a lace with a floral pattern woven with polyester multifilaments was pressed while heating with a dryer and fixedly joined to produce a mesh cylinder for producing a transparent patterned paper.

Example 2 (Manufacture example of dandy roll) A lattice pattern woven with polyester multifilaments, a yarn having a thickness of 0.45 mm, a length of 15 and a width of 20 and a knitted product were dispersed in a water-dispersible urethane resin (concentration: 30%, product name "VO
NDIC 1670 (N) ", manufactured by Dainippon Ink and Chemicals, Inc.) 100 parts by weight, melamine resin (concentration: 80)
%, Trade name "BECKAMIN PM-N", manufactured by Dainippon Ink and Chemicals, Inc. 10 parts by weight, catalyst (trade name "CATALYST376", manufactured by Dainippon Ink and Chemicals, Inc.) 1 part by weight, water 50 parts by weight The excess adhesive is removed with a pistol-type air gun (trade name “Air Duster K605-DX”, manufactured by KINKI Co., Ltd.) at a compressor pressure of 1 to ² kg / cm ^2.
A knitted fabric was prepared by drying with hot air at 20 ° C. and processing the adhesive. Upper net of dandy roll of fourdrinier (made of bronze)
The knitted fabric obtained by processing the adhesive was pressed by a dryer while being heated and adhered. On top of that, a lace with a floral pattern woven with polyester multifilaments (impregnated with the same adhesive) was pressed while heating with a dryer and fixedly joined to produce a dandy roll for the production of transparent patterned paper. .

[0025]

As described above, the mesh cylinder or dandy roll for producing a transparent patterned paper of the present invention is produced, and has the following remarkable advantages. 1) The main work is to fix and join the lace, the sheet-like material that has perforated gaps, is activated by heat, and exhibits adhesiveness, and the net is a fixed work. do not need. Also, compared to the conventional method, a mesh cylinder or a dandy roll for making patterned paper can be manufactured in a very short time. 2) Since the appearance of the see-through pattern is due to the structure of the lace yarn, a see-through paper excellent in gradation can be manufactured as compared with the method of closing the mesh which is mainly performed by the conventional method. Further, since there is no possibility of a hole in the paper layer due to the see-through pattern, there is no restriction on the design of the see-through pattern, and it is possible to manufacture see-through paper of various designs. 3) Compared to the method of directly fixing and joining the lace to the net, the mesh cylinder or the dandy roll of the present invention in which a sheet-like material having a perforated gap between them and being activated by heat and exhibiting adhesiveness is interposed therebetween, Clearness can be sharpened. In addition, since the design of the sheet-like material having a through-hole gap and being activated by heat and exhibiting adhesiveness is transferred to the transparent paper, a complicated design effect can be obtained. 4) When a woven fabric made of tangled weave is used for a sheet-like material having a perforated gap and activated by heat and exhibiting adhesiveness, even if the operation is performed for a long period of time, it is fixedly joined on the woven fabric. Since the lace does not shift and is flat, the lace can be uniformly provided.

[Brief description of the drawings]

FIG. 1 is a perspective view of an example of a mesh cylinder for producing a transparent patterned paper according to the present invention.

FIG. 2 is a perspective view of an example of a dandy roll for producing a transparent patterned paper according to the present invention.

FIG. 3 is a partially enlarged plan view of the surface of another example of the cylinder cylinder of the present invention.

FIG. 4 is a partially enlarged cross-sectional view thereof.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Circular mesh cylinder 2 Lace 3 Perforated knitted or woven fabric processed with thermoplastic adhesive 4 Papermaking net 10 Dandy roll 20 Lace 30 Perforated knitted fabric processed with thermoplastic adhesive Or fabric 40 upper net

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-4-370267 (JP, A) JP-A-3-185200 (JP, A) JP-A-4-370290 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) D21F 1/44-1/46

Claims (6)

(57) [Claims] 1. A sheet-like material having a perforated gap and activated by heat and exhibiting adhesiveness is fixedly joined to the surface of a papermaking net for a circular netting machine or an upper net for a dandy roll,
A mesh cylinder or dandy roll for producing a transparent patterned paper, wherein a lace is fixedly joined to a surface of the sheet-like material. 2. A sheet-like material having a perforated gap and activated by heat and exhibiting adhesiveness is a knitted or woven fabric having a perforated gap formed by processing a thermoplastic adhesive. 2. A mesh cylinder or dandy roll for producing a transparent patterned paper according to claim 1. 3. The mesh cylinder or dandy roll for producing a patterned paper according to claim 2, wherein the woven fabric having a perforated gap is produced by tangling weave. 4. The mesh cylinder or dandy roll according to claim 1, wherein the lace is resin-processed. 5. A sheet-like material having perforated gaps, which is activated by heat and exhibits adhesiveness, is superimposed on the surface of a paper-mesh for a circular-mesh paper machine or an upper net for a dandy roll, and heated to form a circular-mesh paper. A circular mesh cylinder for producing a transparent patterned paper, wherein a papermaking net for a machine or an upper net for a dandy roll is fixedly joined to the sheet-like material, and then a lace is overlaid thereon and the lace is fixedly joined by heating. Or a method of manufacturing a dandy roll. 6. A sheet-like material having a perforated gap and having heat-activated and adhesive properties, and a lace are sequentially stacked on the surface of a papermaking net for a circular netting machine or an upper net for a dandy roll, and heated. A method for producing a net cylinder or a dandy roll for producing a patterned paper, wherein the paper net for a circular net paper machine or the upper net for a dandy roll, the sheet material and the lace are fixedly joined to each other.