JP3080796U - Dry sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a convenient dry sheet in which individual desiccants exhibit sufficient water absorbing power and can be dried and regenerated at a high speed. SOLUTION: The sheet-like base material 11 is made of a gas-permeable material, and the adhesive S is continuously or discontinuously applied to one or both surfaces of the sheet-like base material 11 with a width smaller than the particle size of the desiccant P. It is characterized in that the desiccant P is bonded so as to form a single layer on each of the adhesive applied surfaces to which the adhesive S has been applied.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a dry sheet that can quickly regenerate moisture adsorbed by a desiccant during regeneration and can be regenerated in a short time.

[0002]

[Prior art]

 Recently, various dry sheets in which a desiccant such as silica gel or zeolite is adhered to a base cloth have been proposed (for example, JP-A-52-89863, JP-A-5-93829, etc.).

[0003] In order to increase the contact area with air, these dry sheets have a pelletized or crushed desiccant adhered to a substrate, and the moisture adsorbing power of the desiccant is limited. When it becomes, the adsorbed water is released to the outside by heating the desiccant or drying it in the sun to make it reusable.

[0004]

[Problems to be solved by the invention]

 However, since such a dry sheet is placed on a flat surface such as a floor, a non-permeable base material is used, and a granular desiccant is surely applied to the base material. An adhesive is applied to the entire surface of the base material so as to be attached and held, and a desiccant is placed thereon.

[0005] In this dry sheet, air hardly passes through the base material or does not pass at all, and there is a possibility that the individual desiccants do not sufficiently exhibit the moisture absorbing power. In addition, it takes time to dry and regenerate this, and it is difficult to reuse it.

The present invention has been made to solve such a problem, and the individual desiccants exhibit a sufficient moisture absorbing power, and can be dried and regenerated at a high speed. It is an object of the present invention to provide a dry sheet having a certain quality.

[0007]

[Means for Solving the Problems]

 The object of the present invention is achieved by the following means. (1) In a dry sheet in which a granular or crushed desiccant is attached to an adhesive applied to one surface of a sheet-like substrate, the sheet-like substrate is made of a gas-permeable material, The adhesive is applied continuously or discontinuously on one or both surfaces of the adhesive with a width smaller than the particle size of the desiccant, and the desiccant becomes one layer on each adhesive applied surface on which the adhesive is applied. This is a dry sheet characterized by being joined to a dry sheet. (2) The adhesive according to (1), wherein the adhesive is applied on the sheet-like base material in a linear, wavy, spiral, or mesh pattern in any of linear or dot-like patterns. It is a dry sheet. (3) When the particle size of the desiccant is 0.3 to 5 mm, the adhesive has a width of 0.15 to 2 mm and is equally spaced at a pitch of 0.3 to 5 mm in the width direction. The dry sheet according to the above (1) or (2), wherein the dry sheet is applied so as to extend straight in the axial direction. (4) The adhesive is such that the comb teeth of the doctor member abut on the exposed portion of the rotating roll while being partially immersed in the tank portion, and the comb teeth form a streak-like adhesive on the roll surface. The dry sheet according to any one of (1) to (3) above, wherein the streaky adhesive is transferred to the sheet-like substrate. (5) The dry sheet according to any one of (1) to (4), wherein the adhesive is a hot melt adhesive. (6) The dry sheet according to any one of (1) to (5), wherein the sheet-like substrate is formed of a nonwoven fabric. (7) The dry sheet has a cover provided so as to cover the desiccant, the sheet-like base material and the cover are made of a nonwoven fabric of a thermoplastic material, and the entire periphery or a part thereof is heat-sealed. The dry sheet according to any one of the above (1) to (6).

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a partially cutaway schematic perspective view showing an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of a main part of FIG. In FIG. 1, an adhesive S is applied to one side of a sheet-like base material 11 made of a gas-permeable material, and a dry sheet 10 of the present embodiment is coated with the adhesive S. And a desiccant P in the form of granules or crushed is joined so as to form a single layer without being stacked, and this is covered with a cover 13.

Here, it is preferable that the desiccant P is chemically stable, does not undergo deliquescence alteration and discoloration due to the adsorption of moisture, and has no toxicity, and a substance is placed on the drying sheet 10. In consideration of this, it is preferable that the material is relatively hard. For example, it is preferable to use relatively inexpensive silica gel or zeolite, etc., but it is also possible to use a material whose moisture absorption characteristics are changed depending on the use. When impregnated with an insect repellent, a fungicide or a deodorant, not only drying but also insect repellent, fungicide and deodorizing functions are exhibited, which is more preferable.

It is preferable that the sheet-like base material 11 is a material having air permeability and easily deformable. If there is air permeability, moisture contained in the air is easily adsorbed by the desiccant P, and drying is easy. Further, if it is easily deformed, not only can it be easily installed even if the installation surface has irregularities, the sheet-like base material 11 can be easily handled at the time of manufacturing, which is convenient.

[0012] Specifically, it is preferable to be constituted by a nonwoven fabric. The nonwoven fabric is not only easy to apply the adhesive, but also extremely breathable and easy to deform.

As the adhesive S, it is preferable that the adhesive S has such an adhesive strength that the desiccant P does not fall off even if the application area or the application amount is small. As a specific example, it is preferable to use a hot melt adhesive. Hot melt adhesives have the advantage that they do not penetrate into the desiccant during use and do not require drying, and are preferred as adhesives for dry sheets.

The application pattern, width, and pitch of the adhesive S are also related to the size of the desiccant P. However, basically, the air permeability when the adhesive S is applied to the sheet-like substrate 11 is not impaired. Need to be

[0015] Exemplarily, the application pattern may be a straight, wavy, spiral, mesh, or the like, and is preferably applied in a thin line or dot shape as much as possible. From the viewpoint of manufacturing and cost, a linear or wavy shape, which makes the coating apparatus inexpensive, is preferable. However, in any case, it is necessary to avoid applying the adhesive S to the nonwoven fabric without gaps and over the entire surface.

The width of the adhesive S is basically smaller than the particle size of the desiccant P. Since the desiccant P is not spherical in shape but is mixed in various forms such as elliptical or hemispherical, it is difficult to specify the optimum coating width. Since the size of the particle size of the agent P is about 0.3 to 5 mm, the result that the width of the adhesive S is preferably 0.15 to 2 mm was obtained.

However, if the desiccant P is sieved and the particle size of the desiccant P to be used is made uniform, the coating width may be matched to the particle size of the desiccant P. For example, if the particle size of the desiccant P is 0.3 mm, the width of the adhesive S is about 0.15 mm, and if the particle size is about 5 mm, the width is about 2 mm. It has been found that a preferred dry sheet 10 is obtained.

Even if such an application pattern, width, and pitch are employed, various attachment states of the desiccant P can be selected. In order to obtain a high water adsorption capacity, it is preferable that the layers be densely spread as they come into contact with each other.

However, in some cases, it is preferable not to be so dense that the desiccants P come into contact with each other. For example, if a large dry sheet or the like is made dense, the desiccants P may interfere with each other when the sheet is folded, and the sheet may become bulky at the time of conveyance. In this case, the density is not increased, or the density is partially made “rough”, or only a part where the desiccant P is not attached is formed.

Although there is no practical problem in a state where the desiccant P is simply bonded to the sheet-like base material 11, the desiccant P is constantly exposed, so that the desiccant P falls off when used for a long time. There is a fear. For this reason, it is preferable to cover the entire desiccant P with the cover 13. This cover 13 is also preferably made of a breathable nonwoven fabric.

Since the dry sheet 10 needs to be shielded from the outside air until immediately before use, the whole is sealed with a non-permeable bag (not shown) such as polyethylene or aluminum to release the air inside. State.

Next, the manufacturing method of the above embodiment will be described.

FIG. 3 is an explanatory view schematically showing an apparatus for manufacturing a dry sheet, and FIG. 4 is an enlarged front view of a main part of the doctor member shown in FIG. The sheet-like base material 11 is pulled out from the winding roller 20, guided by a guide roller 21, and sent to the adhesive application section 22.

For example, in the case of forming a linear coating pattern, the adhesive coating section 22 uses a so-called roll coater. In this roll coater, a hot melt adhesive S is stored in a tank T, an adhesive application roller 23 is partially immersed in the tank 22, and a doctor member 24 is brought into contact with an exposed portion of the roller 23. I have.

As shown in FIG. 4, the doctor member 24 is a thin metal plate 24 a having a plurality of arc-shaped, rectangular or triangular concave portions r formed at a front end 24 b thereof. Most of the hot melt adhesive S adhered to the surface of the adhesive applying roller 23 is scraped off, and the adhesive S corresponding to the concave portion r remains on the surface of the adhesive applying roller 23. The doctor member 24 has a slit 25 formed therein, whereby the doctor member 24 bends so that the operation can be performed smoothly.

The doctor member 24 can set the pattern, width, and pitch of the adhesive S to be applied by appropriately changing the diameter d, width, and height of the concave portion r and the pitch p.

In other words, after the hot melt adhesive S has been scraped off by the doctor member 24, the thin streaky adhesive S 2 that has passed through the concave portion r remains on the surface of the adhesive application roller 23. When the sheet-shaped base material 11 is press-bonded thereto, the adhesive S having a predetermined pattern, width and pitch is transferred to the surface of the sheet-shaped base material 11.

For example, when the doctor member 24 comes into contact with the surface of the adhesive application roller 23, the thin adhesive S passing through the concave portion r remains on the surface of the roller 23, and a straight pattern is drawn. However, if the doctor member 24 is periodically moved in the axial direction of the adhesive coating roller 23, a wavy pattern will be drawn.

When the spiral or mesh pattern is used or when the adhesive is applied in a dotted manner, it is preferable to use an application gun instead of the roll coater. In particular, when applying in the form of dots, the adhesive may be broken, so the viscosity of the adhesive is preferably adjusted by heating or the like to increase the fluidity, and the adhesive is preferably applied in a spray form using an application gun. .

In the case where the above-mentioned portion to which the adhesive S is not applied is formed, although not particularly limited, for example, masking (not shown) is performed on the sheet-like base material 11 at predetermined intervals. After the adhesive is applied, the adhesive is peeled off.

When the adhesive S having the predetermined pattern is transferred to the surface of the sheet-like base material 11 in this way, the sheet-like base material 11 moves to a lower level of the hopper 27 along the transport path 26. Since the granular desiccant P is charged into the hopper 27, when the on-off valve 28 is opened, the desiccant P is supplied onto the sheet-like base material 11.

The desiccant P on the sheet-like base material 11 is leveled by a scraper or the like (not shown) so as to form one layer, and is joined to the adhesive S. The surplus desiccant P is dropped from the side of the sheet-like substrate 11 and returned to the hopper 27.

In this case, if the particle size of the desiccant P is 0.3 to 5 mm, the width of the adhesive is 0.15 to 2 mm, and the pitch is 0.3 to 5 mm at equal intervals in the width direction, the hopper Only by dropping from the sheet 27, it can be arranged on the sheet-like base material in a state of close contact, and workability is improved.

[0034] The cover 13 is hung on the sheet-like base material 11 to which the desiccant P is bonded in this manner. In addition, in order to ensure the bonding state between the desiccant P and the sheet-shaped base material 11, pressure may be applied by the pressure roller 29.

The cover 13 and the sheet-like base material 11 are heat-sealed Hs (see FIG. 1) by heating members 30 a, 30 b, and 30 c on a portion where the adhesive S is not applied by the masking and on both sides. The heating members 30a and 30b heat-seal the front and rear ends in the longitudinal direction of the sheet-like base material 11, and the heating members 30c heat-seal both sides of the sheet-like base material 11.

As a result, the outer periphery of the desiccant P is surrounded by the heat seal Hs, and there is no possibility that the desiccant P may fall off even if it is slightly peeled.

The heat-sealed dry sheet 10 is cut to a predetermined length by the cutter 31 at the front end and the rear end.

When the dry sheet 10 thus formed is placed in a place with high humidity, air containing moisture flows through the sheet-like base material 11 made of nonwoven fabric and the cover 13. It exhibits high moisture adsorption and dehumidifies.

Then, when the moisture absorption limit is reached, it is taken out of a place with high humidity and exposed under the sun. Also in this case, the dried air passes through the sheet-like base material 11 and the cover 13 made of a non-woven fabric, so that the water that has come out of the desiccant S is quickly dried by the air. Released to the outside. As a result, the dry sheet 10 not only has a high water adsorption power, but also can release the adsorbed water to the outside in a short time at the time of regeneration, and so-called high-speed dry regeneration can be performed.

When an experiment was performed to compare the dry sheet according to the present invention with a conventional dry sheet, the following results were obtained. Here, the conventional dry sheet used was a sheet-like substrate having no air permeability, and the same desiccant was used as the dry sheet according to the present invention.

In the experiment, each dry sheet was allowed to absorb moisture for 48 hours at a temperature of 30 ° C. and a humidity of 90%, and then heated air at 60 ° C. was added thereto to determine the amount (g) of water evaporating with time. The regeneration rates of both dried sheets were determined. The results were as shown in Table 1. This is shown in a graph in FIG.

Here, the reproduction rate is a value obtained by the following equation.

Regeneration rate (%) = (amount of evaporated water after elapse of a predetermined time / maximum moisture absorption) × 100 Further, the ratio between the respective regeneration speeds of the dry sheet according to the present invention and the conventional sheet was also determined. Here, the reproduction speed of the dry sheet according to the present invention when the reproduction speed of the conventional device is set to “100” is shown. The reproduction speed ratio is obtained based on the reproduction rates of the two.

[0044]

[Table 1]

As is clear from the results, for example, the time required to obtain a regeneration rate of 40% was 240 minutes for the conventional one, whereas the dry sheet according to the present invention was half the time. It can be obtained in 120 minutes.

Regarding the reproduction rate itself, there is little difference in the reproduction rate at the beginning, but the difference in the reproduction rate is widened with the passage of time and elapses. ing.

Further, the conventional one has a limit of a regeneration rate of 50%, but the dry sheet according to the present invention has obtained a result exceeding 70%.

That is, it can be seen that the drying rate of the dry sheet according to the present invention is considerably higher than that of the conventional sheet.

The above description is an embodiment of the present invention, and the present invention can be variously modified without departing from the gist described in the claims for utility model registration. For example, in the above-described embodiment, the sheet-like substrate is formed of a nonwoven fabric, but not limited to this, any material may be used as long as the material has air permeability. The adhesive is applied in a linear, wavy, spiral, or mesh-like linear or dot pattern, but any pattern may be used as long as it does not hinder the air permeability of the nonwoven fabric. . Further, the application of the adhesive may be performed not only on one side of the substrate but also on both sides. When applying on both sides, it is necessary to apply as much as possible so as not to hinder the air permeability of the sheet-shaped base material. It is preferable to join.

[0050]

[Effect of the invention]

 As described above, in the invention of claim 1, the sheet-like base material is made of a gas-permeable material, and the adhesive is applied to one or both surfaces, and one layer of the desiccant is applied to each adhesive applied surface. Because of the bonding, air flows through the drying sheet, and many desiccants come into direct contact with the air.All the desiccants can exhibit moisture adsorption power very effectively, and the It will be expensive. In addition, even when drying and regenerating by the sun, drying can be reused in a very short time. Furthermore, because the surface is smooth and thin, it does not take up space when used, it is space-saving, and it is easy to deform, so the installation location is not specified.

According to the second aspect of the present invention, since the application pattern of the adhesive on the sheet-like base material is linear, wavy, spiral, mesh, etc., linear or dot-like, the ventilation of the sheet-like base material is achieved. Without impairing the resiliency, the water adsorbing power of the desiccant and the reusability by drying are greatly improved.

According to the invention of claim 3, since the width of the adhesive is 0.15 to 2 mm and the pitch is equally spaced in the width direction of 0.3 to 5 mm, a general drying method having a particle size of 0.3 to 5 mm is used. The agent can be brought into more intimate contact by simple drop bonding.

According to the invention of claim 4, when the application of the adhesive is performed by a roll coater, a linear adhesive is formed on the roll surface by a doctor member having a concave portion, and the linear adhesive is transferred to a sheet-like substrate. It is possible to apply the adhesive without requiring any special equipment.

According to a fifth aspect of the present invention, if the adhesive is a hot melt adhesive, it is freezing, not brittle, does not require drying, and can be manufactured at low cost.

In the invention of claim 6, since the sheet-like substrate is made of a non-woven fabric, the air permeability of the sheet-like substrate is enhanced, and the water adsorbing power and the reproducibility by drying are further improved.

According to the invention of claim 7, since the sheet-like base material and the cover are made of a nonwoven fabric of a thermoplastic material and the periphery and the like are heat-sealed, they can be used for a long time without dropping the desiccant.

[Brief description of the drawings]

FIG. 1 is a partially cut-away schematic perspective view showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part of FIG.

FIG. 3 is an explanatory view schematically showing an apparatus for manufacturing a dry sheet.

FIG. 4 is an enlarged front view of a main part of the doctor shown in FIG.

FIG. 5 is a graph showing experimental results.

[Explanation of symbols]

 11: sheet base material, 13: cover, 22: tank portion, 23: roll, 24: doctor member, 24b: doctor member tip, Hs: heat seal, P: desiccant, r: concave portion, S: adhesive . T: tank part.

Claims (7)

[Utility model registration claims] 1. A dry sheet in which a granular or crushed desiccant (P) is attached to an adhesive (S) applied to one surface of a sheet-like substrate (11), wherein the sheet-like substrate (11) is The adhesive (S) is continuously or discontinuously applied to one or both surfaces of the sheet-shaped substrate (11) with a width smaller than the particle size of the desiccant (P). A dry sheet, wherein the desiccant (P) is joined to each adhesive-coated surface to which the adhesive has been applied so as to form a single layer. 2. The adhesive (S) is provided on the sheet-like substrate (1).
1) The dry sheet according to claim 1, wherein the dry sheet is applied on the upper surface in a linear or wavy shape, a spiral shape or a mesh shape in a linear or dot pattern. 3. The adhesive (S) has a width of 0.15 to 2 mm when the particle size of the desiccant (P) is 0.3 to 5 mm, and has a width of 0.3 to 5 mm in the width direction. 3. The dry sheet according to claim 1, wherein the dry sheet is applied so as to extend linearly in the axial direction so as to be equally spaced at a pitch. 4. The tip end (24b) of a doctor member (24) is applied to an exposed portion of a roll (23) rotating while a part of the adhesive (S) is immersed in a tank portion (T). Contact and the tip (24b)
A linear adhesive (S) is formed on the roll surface by the concave portion (r) formed in the sheet-like base material (1).
4. The method according to claim 1, wherein the image is transferred to (1).
A dry sheet according to any one of the above. 5. The dry sheet according to claim 1, wherein the adhesive (S) is formed of a hot melt adhesive. 6. The dry sheet according to claim 1, wherein the sheet-like substrate (11) is made of a nonwoven fabric. 7. The drying sheet (10) is provided with the desiccant (P).
Having a cover (13) provided so as to cover, the sheet-like substrate (11) and the cover (13) are made of a nonwoven fabric of a thermoplastic material, and the entire circumference or a part thereof is heat-sealed (Hs). The dry sheet according to any one of claims 1 to 6, wherein: