JPH0138057Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a water-retaining mat made of polymeric paper that is suitably used to treat so-called drips such as body fluids exuding from fresh foods during transportation, and in particular, the drips are treated to coagulate into gelatin. This invention relates to a water-retaining mat made of reactive polymeric paper that prevents the outflow and diffusion of water drippings.

If the above-mentioned drips are simply absorbed by water-absorbing paper, the drips will rapidly soak up and spread due to the capillary phenomenon of the water-absorbing paper, and even a small amount of water will wet a wide area. It is unsuitable as a water-absorbing paper for drip treatment, which is required to prevent water seepage and diffusion, or to prevent a large amount of water from flowing out.

Therefore, the present invention provides a water-retaining mat that satisfies the conditions required for the above-mentioned drip treatment. The purpose is to utilize the water reactivity of synthetic resin powder and to achieve the above object through a combination and synergistic action.

The present invention uses, as water-absorbing paper, paper whose texture is equivalent to that of toilet paper, tissue paper (generally referred to as household tissue paper), or household tissue paper itself.

The applicant has already disclosed in Utility Model Application No. 163599/1983,
The company provides embossed paper whose base material is polymeric paper, which is made by stacking multiple sheets of household tissue paper and embossing them.

This embossed paper has a laminated structure in which household tissue paper is polymerized and pasted together by the pressure of embossing, providing a cushioning paper that takes full advantage of the bulky and soft properties unique to household tissue paper.

The present invention utilizes the structure of such a laminated paper as a water-absorbing paper for a water-retaining mat, which is different from the purpose of this buffer paper.

The first embodiment will be explained as follows.

That is, two or more sheets of the household tissue paper 1 are stacked, and this is further lined with a paperboard 2 made of cardboard base paper, etc., and an embossing process is applied to the polymerized paper of the household tissue paper 1 and the paperboard 2, and the pressing force causes the two to bond together. Furthermore, a water-absorbing synthetic resin powder 3 which reacts with water and coagulates into a gelatin-like state is held at the bonded interface between the household thin paper 1 and the paperboard 2.

The water-absorbing synthetic resin powder 3 is adhered and held between the paper layers by pressing the concavo-convex portions 4 through the embossing process.

That is, the uneven portions 4 of the paperboard 2 are formed by embossing.
A crack 5 is generated at the apex, and the water-absorbing synthetic resin powder 3 is supported without falling by the crack structure and the fluff on the surface of the household tissue paper.

As a result of the above, the paper layer on one side (front side) bordering on the water-absorbing synthetic resin powder 3 is made of paper with high water absorbency, and the other side (back side) is entirely reinforced to provide rigidity. A water-retaining mat W having a paper layer having water-blocking properties is constructed.

Figure 3 shows a second embodiment in which the water-retaining mat W of the first embodiment is further lined with polylaminated paper 6 (laminated on one or both sides) to further improve the water-blocking property on the back side. shows.

As the water-absorbing synthetic resin powder in each of the above Examples, a crosslinked polysodium acrylate polymer is preferably used.

The water-retaining mat W made of polymeric paper provided in each of the above embodiments traps moisture such as the drips with a highly water-absorbing paper layer on one side, and at the same time absorbs the trapped moisture with the polyacrylic acid. The soda crosslinked polymer powder reacts rapidly and solidifies. The solidified form is in the form of a sol, with a gelatin-like appearance and no fluidity, and no further diffusion occurs.

In order to understand the structure of the present invention, an example of manufacturing a water-retaining mat W made of the above-mentioned polymeric paper will be described based on FIG. 4.

As shown in the figure, a roll 1a of household thin paper 1
While unwinding the same thin paper 1 from a roll 2a of paperboard 2, which is a cardboard base paper, both 1 and 2 are introduced between embossing rolls 7 and 8 and pasted together to perform embossing. .

A supply means for the water-absorbing synthetic resin powder 3 is arranged in front of the embossing rolls 7 and 8.

The supply means consists of a supply roll 9 that rotates in contact with the bonded surface of the paperboard 2 and a supply box 10 provided on the top surface of the roll 9. The water-absorbing synthetic resin powder 3 is brought into direct contact with the upper surface of the roll 9 through the opening so that it can fall naturally, and as the roll 9 rotates, the powder 3 adhering to the roll surface is applied to the overlapping surface of the paperboard 2 near the bottom dead center of the roll. Attach.

In order to adjust the amount of water-absorbing synthetic resin powder 3 carried out by the rolls 9, a gate plate 11 is provided on the side of the supply box 10, and the opening amount of the powder outlet that opens in contact with the rolls 9 can be adjusted. do.

In this way, the water-absorbing synthetic resin powder 3 is applied to the household tissue paper 1 and the paperboard 2 between the embossing rolls 7 and 8.
Both papers 1 and 1 are sandwiched between the
At the same time as the pressure-bonding of the two sheets is completed, the water-absorbing synthetic resin powder is held between the two sheets.

This is cut to form a water-retaining mat W made of the polymeric paper of the first embodiment.

Further, as shown in FIG. 4, the household thin paper 1 is lined with the paperboard 2 as described above, and while forming a polymeric paper 6' with the water-absorbing synthetic resin powder 3 interposed and retained between the two papers, the paper is placed on the glue roll 12. Therefore, the adhesive 14 is applied to the embossed surface (four apexes of the uneven parts) of the overlapping surface of the polymeric paper 6', and the roll 6a is applied to this adhesive-adhered surface.
The water-retaining mat W made of the polymeric paper of the second embodiment can be formed by stacking the polylaminated papers 6 drawn from the polylaminated paper 6 using a press roll 15, adhering them, and backing them.

The uneven portion 4 obtained by embossing consists of a group of individual hemispherical small protrusions, but in order to facilitate understanding, the cross section of the water retaining mat W is shown in a wavy shape in FIGS. 1 to 4. Ta.

In the present invention, a plurality of sheets of paper are polymerized according to each of the above embodiments, and a water-absorbing synthetic resin powder such as a cross-linked polyacrylic acid cross-linked polymer that reacts with water and coagulates into a gelatin-like state is held between the paper layers. The paper layer on one side bordering the water-absorbing synthetic resin powder is made of a paper quality that is highly water-absorbing, and the paper layer on the other side bordering the water-absorbing synthetic resin powder is made of a paper quality that has water-blocking properties. is,
Further, the polymeric paper is embossed, and the polymeric paper is bonded together by pressure bonding accompanying the embossing, and the water-absorbing synthetic resin powder is held by the pressure bonding. To provide a water-retaining mat made of polymeric paper.

The water-retaining mat has a highly water-absorbent paper layer on one side of the water-retaining mat that absorbs and traps moisture well, and at the same time, the absorbed and trapped water is immediately transferred to the water-absorbing synthetic resin powder present under the water-absorbing paper layer. It reacts and coagulates into a gelatinous state.

As a result, the dropped water does not spread over a wide area, and is solidified immediately after dropping, and only wets the extreme parts of the water retaining mat, effectively preventing seepage, diffusion, or outflow. Further, the subsequent dripping of moisture is handled in the same manner.

Further, due to the presence of a paper layer having a water-blocking property as a backing paper, moisture is well blocked and water permeation is reliably prevented.

In other words, this water-retaining mat uses the synergistic effect of the combination of the good water absorbency of water-absorbing paper and the water-absorbing synthetic resin powder to eliminate the drawbacks of water-absorbing paper and satisfy the conditions required for the above-mentioned drip treatment, etc., which takes advantage of its advantages. It is possible to provide a water-retaining mat that has a high degree of water retention.

In addition, while accurately forming the laminated paper and holding the water-absorbing synthetic resin powder by laminating the paper to achieve the above effects, the water-absorbing synthetic resin is produced by adopting non-adhesive lamination (lamination by pressure bonding) that does not depend on adhesives. The purpose of holding the powder in a non-reactive state between the paper layers can be achieved at the same time as achieving the purpose of laminating the paper, and the holding between the paper layers can be achieved without causing a reactive state of the powder as would be the case when using an adhesive. Also, highly water-absorbent paper has an elastic paper layer that tries to restore its shape during embossing, while paper that has water-blocking properties has a rigid paper layer that tries to retain its shape during embossing, so both paper layers are Due to the synergistic effect of the above elasticity and rigidity, the emboss formation and the emboss bond (non-adhesive bond) between the two paper layers after the emboss formation are made good, and the water-absorbing synthetic resin powder is added between the two paper layers by strengthening the emboss bond. It can be expected to have the effect of accurately retaining.

As shown in Figure 5, the water-retaining mat as described above is installed on the inner bottom surface of a cardboard box, and the water-retaining mat is laid with the water-absorbent paper layer on the top surface and the water-blocking paper layer on the bottom surface. By doing so, it is possible to make good use of the characteristics of the water-retaining mat described above, to accurately prevent drips from packaged products from flowing out of the cardboard box, and to reliably capture the drips inside the cardboard box. That is.

In addition, the water-retaining mat is not bonded and solidified with adhesive or heat embossing, but is made into a laminate by simple pressure bonding that does not damage the paper quality, and retains the water-absorbing synthetic resin powder. , a good buffering effect can be expected due to the highly water-absorbing paper layer.

[Brief explanation of the drawing]

Fig. 1 is an enlarged sectional view of a water-retaining mat made of polymeric paper showing the first embodiment of the present invention, Fig. 2 is a partial sectional view showing the first embodiment on a larger scale, and Fig. 3 is a second embodiment of the same. FIG. 4 is a side view schematically showing the manufacturing process of the water-retaining mat according to the present invention, and FIG. 5 is a cross-sectional view of a packaging box showing an example of the use of the water-retaining mat according to the present invention. . 1...Household thin paper, 2...Paperboard, 3...Water-absorbing synthetic resin powder, 4...Irregularities, 5...Cracks, W
...Water retention mat.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) Multiple sheets of paper are polymerized and a water-absorbing synthetic resin powder, such as cross-linked polyacrylic acid cross-linked polymer, which reacts with water and coagulates into a gelatin-like state, is retained between the paper layers. , the paper layer on one side bordering the water-absorbing synthetic resin powder is made of a paper quality that is highly water-absorbing, and the paper layer on the other side is made of a paper quality that has water-blocking properties;
The polymeric paper is embossed, and the polymeric paper is pasted together by pressure bonding accompanying the embossing, and the water-absorbing synthetic resin powder is retained by the pressure bonding. A water-retaining mat made of polymeric paper characterized by: (2) Claims for registration of a utility model characterized in that the water-blocking paper layer side is lined with polylaminated paper, and the polylaminated paper and the top of the embossment are bonded together with an adhesive. A water-retaining mat made of the polymeric paper according to item 1.