JPH08176998A - Raw paper for hand towel - Google Patents

Abstract

PURPOSE: To produce raw paper for hand towels having excellent wet strength and flexibility by combining a cellulosic fiber layer with a mixed layer of cellulosic fiber and a synthetic fiber in a wet method and subjecting it to a crepe processing. CONSTITUTION: A pulp slurry obtained by mixing a conifer bleached pulp and a broodleaf tree bleached pulp at a ratio of 50/50 is added with an epoxy resin and a polyacrylamide resin in a prescribed amounts, and a wet web containing 100% cellulosic fibers having an basis weight of 30g/m<2> is produced therefrom using a cylinder paper machine. On the other hand, a broadleaf tree pulp is mixed with synthetic fibers such as of polyester and fibers having low melting point and beaten to form a pulp slurry. The slurry is added with an epoxy resin and a polyacrylamide resin and a wet web having a basis weight of 30g/m<2> similar to the above is produced, and then combined with the above wet web containing 100% cellulosic fibers to form a sheet having a basis weight of 60g/m<2> . Next, the resultant sheet is subjected to a wet crepe processing in a state containing 60-70% water and dried to obtain the objective raw paper for hand towels.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base paper for hand towels which is used up, and more particularly to a base paper for hand towels which can be produced with high efficiency by two-layer papermaking.

[0002]

2. Description of the Related Art As a base paper for disposable hand towels used in place of cloth hand towels in hotels, restaurants, coffee shops, etc., dry non-woven cloth is heat-embossed, or non-woven cloth and tissue paper are laminated. Although heat-embossed products are used as high-grade products, they are excellent in touch but expensive, which is a major drawback for disposable products. Also, a polyethylene film sandwiched between two sheets of paper and laminated by heat embossing is inexpensive and widely used. In this case, the manufacturing process is slightly complicated because of the three-layer laminated structure.

As the quality characteristics of the base paper for disposable hand towels, it is necessary to have characteristics similar to those of cloth hand towels, and wet strength, flexibility, touch and water absorption are important qualities.

Cellulose fibers, recycled fibers, and synthetic fibers are mainly used as raw materials for disposable hand towels. Although natural cellulose fibers are advantageous in terms of cost, they are disadvantageous in that they have low wet strength and lack flexibility as compared with synthetic fibers. Addition of chemicals to improve wet strength further reduces flexibility. Therefore, as a raw material, it is the current situation that cellulosic fibers and synthetic fibers are appropriately combined to balance quality such as wet strength and flexibility and cost.

As a base paper for hand towels, without using a laminated structure,
For the purpose of efficiently and inexpensively manufacturing with a single structure,
A crepe paper made by blending cellulose fiber and synthetic fiber is proposed. (Japanese Patent Laid-Open No. 5-98594) However, when the cellulose fiber and the synthetic fiber are blended to make a paper, it is necessary to blend the low melting point synthetic fiber as a binder, and therefore, it is melted in the drying step of the paper machine. Some of the binder adheres to the dryer canvas and stains the canvas, greatly reducing the operating efficiency of the paper machine.

[0006]

DISCLOSURE OF INVENTION Problems to be Solved by the Invention As a result of intensive studies in view of the present situation, the present inventors have used cellulose fibers and synthetic fibers as raw materials, and after combining two layers having different raw material compositions with wet paper. The present invention has been completed by finding that the crepe treatment gives an excellent base paper for hand towels, has good operability in the paper making process, and can be efficiently manufactured.

[0007]

According to the present invention, a layer consisting of cellulose fibers and a layer consisting of cellulose fibers and synthetic fibers are made into two layers by a wet papermaking method, and then a clay
A base paper for hand towels, which is characterized by being processed.

The cellulose fibers used in the present invention include wood fibers such as conifers and hardwoods, non-wood fibers such as Manila hemp, kenaf and bagasse, and regenerated fibers such as rayon. These fibers are used alone or as a mixture of several kinds.

The synthetic fibers used in the present invention include simple fibers such as polyester fibers, vinylon fibers and polyolefin fibers, so-called core-sheath type composite fibers having a high melting point synthetic core and a low melting point synthetic fiber. Hollow fibers that give a bulky effect, crimped crimp fibers, and modified fibers having a modified cross-sectional shape can be used. These fibers are used alone or as a mixture.

In the present invention, the layer consisting only of cellulose fibers is used in the drying step of a paper machine in a canvas of a Yankee dryer or a canvas for transporting a sheet by a through dryer or a surface contacting with a wire mesh. And By doing so, the canvas or the wire mesh does not have a problem of being contaminated by the molten binder, so that the operability of the paper machine is good and the efficient operation becomes possible.

In the layer of the cellulose fiber and the synthetic fiber of the present invention, the compounding ratio of the cellulose fiber and the synthetic fiber is not particularly limited, but as an example,
About 60 to 80% of fiber is blended. As the binder, a synthetic fiber having a low melting point of 60 to 130 ° C., or a polyvinyl alcohol fiber having a dissolving and adhering action with hot water of 60 ° C. or higher is used.

The basis weight of the two-layered laminated base paper of the present invention is not particularly limited, but one having a basis weight of 50 to 70 g / m ² is preferable as the base paper for hand towel. In the present invention, the crepe process is
This is done to give the sheet flexibility. The crepe processing can be performed by either a dry crepe performed with a dryer or a calender after drying the sheet, or a wet crepe performed with a press roll or the like in a wet paper state. However, in dry crepe, when tension is applied in the subsequent process, the sheet stretches and the crepe rate decreases,
Since the flexibility may be impaired, the moisture content of the sheet is 6
It is desirable to perform the wet crepe in the state of 0 to 70%.

[0013]

The present invention will be described in detail with reference to the following examples. Parts and% in the text mean parts by weight and% by weight.

[0014]

Example 1 As a layer consisting only of cellulose fibers, the raw materials were blended with 50% of softwood bleached pulp (NBKP) and 50% of hardwood bleached pulp (LBKP), and a Canadian standard free
Nes 550 ml was mixed and beaten. Epoxy resin (trade name WS-570, Japan PM
1.5% to pulp, polyacrylic amide resin (trade name: Polystron 194, Arakawa Chemical Industry Co., Ltd.)
1.0%), and the basis weight is 30 with a cylinder paper machine.
A wet paper having a weight of g / m ² was produced.

For the layer comprising cellulose fibers and synthetic fibers, LBKP was used as the cellulose fibers and polyester fibers were used as the synthetic fibers. As the polyester fiber, a high melting point fiber (melting point 260 ° C., trade name TAO4
N, manufactured by Teijin Ltd. and low melting point fiber (melting point 110)
C., trade name TJO4CN, manufactured by Teijin Co., Ltd.

LBK beaten to a freeness of 570 ml
P74%, high-melting point fiber 14%, low-melting point fiber 12% are blended, and an epoxy resin (trade name WS-570, manufactured by Japan PM Co., Ltd.) is added to the pulp slurry obtained by adding 1.5 to the pulp.
%, Polyacrylic amide resin (trade name: Polystron 1
94, manufactured by Arakawa Chemical Industry Co., Ltd., was added 1.0%, and a wet paper having a basis weight of 30 g / m ² was made into a paper by an inclined wire-type paper machine, and the cellulose fiber was made by the above-mentioned round net. A sheet having a basis weight of 60 g / m ² was obtained by combining with a layer consisting of only the sheet.

The sheet thus obtained was subjected to a crepe treatment by pressing a doctor on the surface of a press roll with a press part of a paper machine, and then dried with a through dryer to produce a hand towel base paper. At the time of drying, the layer of cellulosic fibers alone was brought into contact with the wire mesh surface for sheet transportation in the through dryer.

[0018]

[Example 2] The high melting point fiber (TAO) of Example 1 was used as a synthetic fiber in a layer composed of cellulose fiber and synthetic fiber.
4N) was replaced with 14% of crimped high melting point polyester fiber (melting point 260 ° C., trade name TAO, manufactured by Teijin Co., Ltd.) to produce a squeezing base paper in the same manner as in Example 1. .

[0019]

[Comparative Example 1] NBKP 43.5%, LBKP 43.5 as raw materials for the layer composed of cellulose fiber and synthetic fiber
%, Low melting point polyester fiber (TJO shown in Example 1
4CN) 13% was blended and the high melting point polyester fiber was not used, and the inclined wire-type paper machine was used in the same manner as in Example 1 to produce a wet towel base paper.

Tensile strength, wet tensile strength of the wet paper base papers obtained in Examples 1 and 2 and Comparative Example 1
And the rigidity (flexibility) were measured. The measuring method is described below. Tensile strength: The longitudinal direction of the sheet was measured according to JIS P8113. Wet tensile strength: 105 in a hot air circulation oven
After heating at ℃ for 10 minutes, soak in water at 20 ℃ for 10 minutes, wipe off the water adhering to the surface, JIS P8113
The longitudinal direction was measured in accordance with. Rigidity: Measured in the vertical direction according to JIS P8143. The state of fouling due to the adherence of lees to the sheet transport wire mesh of the through dryer was observed. The results are shown in Table 1.

[0021]

[Table 1]

[0022]

As is apparent from Table 1, the base paper for hand towel according to the present invention comprises a layer made of only cellulose fiber and a layer made of cellulose fiber and synthetic fiber, which are wet-processed. Since it has been subjected to crepe processing, a wet paper base paper having excellent wet strength and flexibility can be obtained. In addition, flexibility can be increased by blending crimped fibers. Further, since the layer made of only cellulose fiber is brought into contact with the canvas of the dryer or the sheet-transporting wire mesh, it is possible to prevent the tools from being soiled and to efficiently produce the tools.

Claims (1)

[Claims] 1. A layer comprising cellulose fibers and a cellulose layer.
A base paper for a hand towel, which is characterized in that after a two-layer papermaking process is carried out by a wet papermaking method with a layer composed of a soot fiber and a synthetic fiber, a crepe process is carried out.