JPH0418196A - Production of water-absorbable paper - Google Patents

Abstract

PURPOSE:To obtain the subject water-absorbing paper such as toilet paper enabling to readily and quickly perform a printing plate-exchanging work by subjecting embossed water-absorbing paper to a flexo-printing process between a specific printing cylinder and a pressing cylinder. CONSTITUTION:In a process for forming non-countable depositions and projections on continuously fed water-absorbing paper 1a, 1b and subsequently winding up the embossed continuous paper, at least one surface of the continuous paper 1c is flexo-printed between a pressing cylinder 7 and a printing cylinder 6 comprising a mandrel 61 and a cylindrical sleeve 62 detachably disposed on the peripheral surface of the mandrel 61 to obtain the objective water-soluble paper.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a manufacturing technology for water-absorbent paper such as toilet paper and paper towels, and more specifically, the paper surface of water-absorbent paper that has been subjected to uneven processing (emboss processing). The present invention relates to a method for producing water-absorbent paper for printing on paper.

<Conventional technology and problems> Currently, embossed paper made by pressing paper with a textured roll and double embossed paper made by layering embossed papers are used to make toilet paper, paper towels, etc. with the aim of improving paper flexibility and increasing paper thickness. It is used.

Recently, attempts have been made to print on paper in order to identify products and to meet consumers' preference for luxury products.

However, in the conventional printing method, a printing plate is directly attached to a printing roll.

When performing special printing for this purpose, if the printing plate is removed from the printing roll, it becomes unusable, and if the printing roll is replaced and used, expensive printing rolls corresponding to the number of plates are required, and it takes time to replace the rolls. This was extremely inconvenient.

For this reason, there is a strong desire to propose a printing technique that allows easy replacement of plates with embossed water-absorbent paper.

<Object of the present invention> The present invention has been made in view of the above points, and its purpose is to print different types of printing on absorbent paper with embossed finish that is easily crushed without changing the roll. The purpose of the present invention is to provide a method for producing water-absorbent paper that can be carried out.

<Means for solving the problem> That is, the present invention involves forming countless irregularities on water-absorbing paper that is continuously supplied, performing embossing, and winding up the embossed continuous paper to form water-absorbent paper. In the manufacturing method, between the printing cylinder and impression cylinder, which consists of a removable cylindrical sleeve attached to the circumferential surface of the mandrel, the continuous paper is embossed and then wound up. It is characterized by flexographic printing on at least one side.

<Description of the present invention> The present invention will be described below with reference to the drawings.

Manufacturing equipment FIG. 1 shows an example of the water-absorbent paper manufacturing equipment according to the present invention.

In this example, a case will be described in which two sheets of continuous paper 1a and 1b are embossed with unevenness, respectively, and printed on one side of a laminated paper 1c which is laminated by pasting them together.

<Opening> Embossing part 2 in the figure is an embossing part, which consists of embossing rolls 2a, 2b with many irregularities engraved on the circumferential surface of each continuous paper 1a, 1b, and rolls 3a, 3b with flat circumferential surfaces. Configure.

Each continuous paper 1a, 1b has each roll 2a, 3a and 2b, 3b
When passing between the circumferential surfaces of the paper, an uneven embossing process is applied to the paper surface.

A gluing roll 4 is disposed close to one of the embossing rolls 2a, and is configured to be able to glue the convex portions of one of the continuous papers 1a that has been embossed.

Further, the embossing rolls 2a, 3a of each set are partially close to each other on their circumferential surfaces, so that the embossed continuous papers 1a, 1b can be laminated together.

A cross-sectional view of an example of stacking continuous paper ICs is shown in FIGS. 2a and 2b.

In both of the illustrated continuous papers 1a and 1b, an embossed cell zone 1d is formed between them, and this embossed cell zone 1d becomes a space that absorbs water, oil, and the like.

Note that the number of stacked continuous paper ICs may be three or more.

Furthermore, in addition to gluing, the means for adhering the continuous papers 1a and 1b are as follows:
It is also possible to bond the laminated paper IC by passing it through a narrow pressure roll and subjecting it to narrow embossing, and there is no need to apply any special bonding means.

<C> Printing section The present invention is characterized in that a printing section 5 is incorporated in a water absorbent paper manufacturing apparatus, and furthermore, the printing section 5 is connected to a mandrel 6.
1 and a removable sleeve 62, and is characterized in that a printing plate with patterns, figures, characters, etc. to be printed is affixed to the surface of the sleeve.

This will be explained in detail.

The printing section 5 includes a plate cylinder 6 and an impression cylinder 7 whose rotation axes are arranged in parallel.
and a supply roller 8 that supplies ink to the plate cylinder 6.

The ink may be a paste type ink, but flexographic ink with low viscosity, high concentration, and quick drying properties is suitable.

A sectional view of the plate cylinder 6 is shown in FIG. 3.4.

The plate cylinder 6 is composed of a steel mandrel 61 and a sleeve 62 that is detachably attached to the mandrel 61.

The mandrel 61 is a hollow body with an opening 63 in a part of the outer peripheral surface.
will be established.

The sleeve 62 is made of an elastic material and has a cylindrical shape.

In this case, the mandrel 61 can be made into a tapered hollow body with a certain slope, and the sleeve 62 can be made into a tapered piece whose inner diameter corresponds to the external shape of the sloped mandrel 61. It is not a necessary condition for invention.

The outer periphery of the sleeve 62 has a uniform diameter, and a printing plate for patterns, figures, characters, etc. to be printed is pasted on the surface.

The printing plate is a flexible relief plate made of natural or synthetic rubber casting or photosensitive resin.

When the sleeve 62 is to be attached, air is press-fitted through the pressure inlet 66 opened on one side 64 of the support shafts 64 and 65 of the sleeve 62, and the press-in air is blown out from the opening 63 to slightly inflate the sleeve 62 and press the mandrel. Attach it to 61.

When the air is stopped, the sleeve 62 shrinks to its original diameter and comes into close contact with the circumferential surface of the mandrel 61.

By forming the mandrel 61 and the sleeve 62 in such a shape, the mandrel 61 and the sleeve 62 can be attached and detached very easily, making it extremely easy to change the printing plate. It is sufficient to prepare only the sleeve 62 that has been prepared.

In addition, the printing section 5 is configured to be able to adjust the interval between the plate cylinder 6 and the impression cylinder 7, so that the convex parts of the embossed laminated paper IC are not crushed and the printing is not misaligned or blurred. Adjust the printing pressure to the appropriate level before use.

In addition, when printing on both sides of the laminated paper 1c, a plurality of printing units 5 may be provided.

<Function> Next, a method for producing water absorbent paper will be explained based on FIG.

The continuous papers 1a and 1b pulled out from the rolls reach an embossing section 2, and as they pass between the circumferential surfaces of the respective rolls 2a and 3a and 2b and 3b, the paper surfaces are embossed with irregularities.

Immediately after this, the continuous paper 1a and another continuous paper 1b are laminated to form a laminated paper 1c.

Thereafter, when the laminated paper 1c reaches the printing section 5 and passes between a plate cylinder 6 and an impression cylinder 7, the outer circumferential surface of the plate cylinder 6 lightly contacts the paper surface and a predetermined printing is performed.

When it is desired to change the printing plate, the injection port 64 provided on one side 64 of the support shaft of the sleeve 62 can be used as shown in Fig. 3.4.
The sleeve 62 is easily removed from the mandrel 61 by injecting air into the mandrel 61 and blowing out the air through the opening 63 to slightly inflate the sleeve 62. By reversing the above process, another printing plate can be pasted. Since the sleeve 62 can be easily attached to the mandrel 61, printing plates can be replaced easily and in a short time.

<Effects of the Present Invention> Since the present invention is as described above, the following effects can be obtained.

<B> By forming the printing plate with an exchangeable cylinder, the printing plate can be replaced easily and in a short time.

<Exposure> Printing can be done during the manufacturing process of water-absorbent paper, so it is advantageous in terms of process.

<C> Printing can be performed on water-absorbent paper that is embossed and has the property of being easily crushed.

<2> It can be applied to the production of various types of water-absorbent paper and has versatility.

[Brief explanation of the drawing]

Figure 1: Overall diagram of water-absorbent paper manufacturing equipment

Claims (1)

[Claims] (1) In a manufacturing method in which water-absorbent paper is produced by forming countless irregularities on continuously supplied water-absorbent paper and applying emboss processing to the paper and winding up the embossed continuous paper, the continuous paper is embossed. The continuous paper is characterized in that flexographic printing is applied to at least one side of the continuous paper between the printing cylinder and the impression cylinder, which are constructed by attaching a removable cylindrical sleeve to the circumferential surface of the mandrel, before being wound up. A method for producing water absorbent paper.