JP2722894B2 - Base paper for toweling - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to disposable towel base paper.

[0002]

[Prior art and its problems] Base paper for business use disposable towels used in hotels, restaurants, coffee shops, etc. can be roughly classified into: 1) hot-embossed dry nonwoven fabric, 2) between two tissues Hot-embossed with a polyethylene film sandwiched between them, and 3) hot-embossed with a tissue and a dry nonwoven fabric layered on top of each other. In terms of cost, 1) is the highest, followed by 3) and 2), and 2) is the cheapest and uses a lot. However,
In the case of 2), there is a dislike that the manufacturing process is complicated because of the three-layer structure. In the cases of 1) and 3), since dry nonwoven fabric is used as a raw material, the productivity is low and the cost is high.

[0003] The quality characteristics required for toweling include:
Examples include wet paper strength, hand feeling, flexibility, and water absorbability. In particular, it is necessary to be bulky in order to give a feeling of hand flesh, and it is common to perform hot embossing for that purpose. In particular, the property of maintaining the shape after hot embossing as it is (this is called embossing property) ) Is required to be high.

As described above, it is desired that the disposable towel has a single structure, is inexpensive, and has a performance close to the characteristics of the cloth towel. However, at present, no base paper for towel having both cost and performance is provided.

[0005]

SUMMARY OF THE INVENTION The present inventor has conducted intensive studies in view of the present situation, and as a result, has specified the blending ratio of cellulose pulp and synthetic fiber using cellulose pulp and synthetic fiber, and has a predetermined heat emboss retention property. The present inventors have found that the optimum paper base characteristics for squeezing can be obtained by providing squeezing, thereby completing the present invention.

[0006] Accordingly, an object of the present invention is to use cellulose pulp as a main component, to have a simple structure and high emboss retention,
An object of the present invention is to provide a towel base paper having a low manufacturing cost.

[0007] The present invention, Ri Do from 50 to 90 wt% cellulose pulp and synthetic fibers 10 to 50% by weight and, and該合
Low melting with melting point of 60-130 ° C, 50-95% by weight of synthetic fiber
A mixed paper made of synthetic fibers having dots is used as a base paper. The base paper is embossed. A glass plate of a size is placed, and a weight is further placed on the glass plate. The weight when the embossed shape of the base paper is completely lost (the total weight of the glass plate and the weight is expressed in g / cm ² ) Is a base paper for toweling, which has been hot-embossed so as to be 15 to 30 g / cm ² .

[0008] Here, the "emboss retention" means that a hot-embossed base paper having a size of 20 mm x 75 mm is adjusted by adding water to a water content of 70%, and then a glass plate of the same size is placed on the base paper. Is placed thereon, and a weight is further placed thereon. The weight when the embossed shape of the base paper completely disappears (the total weight of the glass plate and the weight) is defined as g / cm ² .

The cellulose pulp used in the present invention comprises:
The raw material may be any of conifers, hardwoods, and herbs, and examples thereof include bleached and semi-blown chemical pulp such as kraft pulp and sulfite pulp, semi-chemical pulp, and mechanical pulp, and mixtures thereof.

The synthetic fiber used in the present invention is a single fiber such as polyester, vinylon or nylon, a so-called core-sheath type composite fiber such as a polypropylene or polyethylene fiber as a core, a polyester fiber as a sheath, or a mixture thereof. And appropriately selected for use.

In the present invention, the mixing ratio of cellulose pulp to synthetic fiber is 50 to 90% by weight, preferably 75 to 85% by weight, and synthetic fiber is 10 to 5% by weight.
0% by weight, preferably 15 to 25% by weight. If the blending ratio of the synthetic fiber is less than 10% by weight, the paper strength as towel is insufficient, while if it is more than 50% by weight, flexibility as towel is lost and the cost is increased, which is not suitable.

An important characteristic of the base paper for towel of the present invention comprising a mixed paper of cellulose pulp and synthetic fiber is to provide a good balance between flexibility and a property of sufficiently retaining the embossed shape after hot embossing. A wet crepe treatment or a dry crepe treatment can be performed as needed for the purpose of assisting flexibility.

In the present invention, the emboss retention is 15 to 30 g.
/ Cm ² is applied to the base paper by hot embossing.
The emboss retention is a characteristic required for giving the base paper for wetting a moderate hand feeling, and the higher the numerical value, the better, but if it is excessively high, the hardness increases. In the present invention, the emboss retention is 15 g / cm ^2.
If less than 30 g / cm ² , the desired hand feeling cannot be obtained.
If it is higher, it becomes too hard and is not suitable as a base paper for squeezing.

According to the present invention, the flexibility of the base paper can be adjusted to a desired degree by the type and blending ratio of the cellulose pulp, the type and blending ratio of the synthetic fiber, and creping. However, if the flexibility becomes extremely high, the embossed shape formed by the hot embossing in the subsequent step cannot be sufficiently maintained, and therefore, the flexibility needs to be finely adjusted.

In order to finely adjust the flexibility and the embossing property, in the present invention, 60 to 60
Use synthetic fibers with a low melting point that softens at a low temperature of 130 ° C. and adheres to the cellulose pulp fibers . By using such low-melting-point synthetic fibers, the paper strength of the base paper and the retention of the embossed shape are improved, but when used in an excessively large amount, the hardness tends to increase. Therefore, the use ratio of such low melting point synthetic fibers is 50 to 95 of the total amount of synthetic fibers.
% By weight. If the use ratio is less than 50% by weight, it is difficult to obtain sufficient paper strength for the cost, and if it exceeds 95% by weight, the embossing property and the feeling of hand, which is representative of thickness and softness, are poor.

[0016]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, which, of course, are not intended to limit the present invention.

Examples 1-2 Using the raw materials having the mixing ratios shown in Table 1, wet papermaking was performed with an inclined wire, and dried with a through drier.
/ M ² was prepared by a conventional method. The obtained base paper was measured for air-dry tensile strength, wet tensile strength, rewind width and emboss retention. Table 1 shows the results.

The measuring methods are as follows. 1) Air-dried tensile strength: Measured according to JIS P 8113. 2) Wet tensile strength: After heating the sample in a hot air circulating oven at 105 ° C for 10 minutes, immersing it in water at 20 ° C for 10 minutes, pulling it up, wiping off water adhering to the surface, JIS P
Measured according to 8113.

3) Rewind width: 100 mm x 100 mm
A base paper for squeezing is sized at room temperature 20 ° C and relative humidity 65.
After conditioning for 24 hours in a constant temperature and constant humidity chamber, water is added so that the water content becomes 70% to prepare a sample. This sample is 6mm in diameter
Wrapped around a glass round bar (diameter 9 mm after wrapping) 1
After standing for one minute, the glass rod is removed, and the return width of the base paper after one minute has elapsed is measured. This return width indicates the degree of flexibility,
Smaller numbers are more flexible.

4) Emboss retention: A base paper for toweling is passed between metal rolls having a concave-convex shape at a temperature of 120 ° C., embossed only with a clearance, and then 20 mm ×
Cut out to a size of 75 mm and use it as a sample. Water is added to this sample to adjust the water content to 70% by weight. Next, a glass plate having the same size as the sample and having a known weight is placed on the sample, and a weight is further placed thereon, and the process is continued until the shape of the emboss disappears. The emboss retention is a weight per unit area (g calculated by the total weight of the glass plate and the weight when the shape of the emboss completely disappears.
/ Cm ² ).

Comparative Examples 1 to 3 The same measurements as those of the examples were carried out using commercially available disposable towels as comparative examples. Table 1 shows the results.

The configuration of each commercially available product is as follows. Comparative Example 1: Crepe paper sandwiching polyethylene. Comparative Example 2: Spunbond product of dry nonwoven fabric. Comparative Example 3: Spun lace product of a dry nonwoven fabric.

[0023]

As can be seen from Table 1, the towel of the present invention has paper strength and is excellent in emboss retention compared to the commercially available disposable towels of Comparative Examples 1 to 3.

[0025]

As described above, since the base paper for towel of the present invention has a good balance between flexibility and emboss retention, it represents various qualities required for towel, especially thickness and softness. Can be maintained preferably.

As for flexibility, it is possible to quickly respond to various demands by appropriately changing the mixing ratio of cellulose pulp and synthetic fiber.

Further, in producing the base paper for squeezing of the present invention, since cellulose pulp and synthetic fibers can be produced using an ordinary wet paper machine, there is an advantage that the production process is simple and the production cost can be reduced. is there.

Claims (1)

(57) [Claims] 1. A Ri Do from 50 to 90 wt% cellulose pulp and synthetic fibers 10 to 50% by weight and, and of the synthetic fibers
50-95% by weight has a low melting point of 60-130 ° C
Mixed paper made of synthetic fiber is used as a base paper, and it is emboss-retaining (water-embossed base paper having a size of 20 mm x 75 mm is adjusted to a water content of 70% by adding water, and then the same size is placed on the base paper. The weight when the embossed shape of the base paper is completely lost (the total weight of the glass plate and the weight) is g / g.
towel for base paper that expressed in cm ²⁾ is characterized in that the hot embossing such that 15 to 30 g / cm ^2.