JPH10129739A - Composite sheet, apparatus for manufacturing composite sheet, and manufacture of composite sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a composite sheet easy to be manufactured and, moreover, excellent in productivity by providing a base having water absorption properties and linear resin layers formed on at least one face side of this base. SOLUTION: A composite sheet comprises a base 1 made of an unwoven cloth and a plurality of rows of resin layers 2 provided on the surface of this base 1. The resin layers 2 are of linear ones arranged in parallel with one another and are formed by linearly applying a molten low-density polyethylene on the base 1. Materials for constituting the base 1 may include a woven cloth, paper, etc., other than the unwoven cloth, and resin for constituting the resin layers 2 may include a medium-/low-density polyethylene, polypropylene, etc., other than the low-density polyethylene. The composite sheet is sanitary because bloody dripping is absorbed into the base 1 from each portion between the linear resin layers 2 and the bloody dripping once discharged is not stuck to foodstuffs again. By this method, the composite sheet can be manufactured in an extremely easy way at a low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite sheet used as a tray mat for displaying, for example, fish or meat, or as a main component of sanitary products or disposable diapers, and a technique for manufacturing the same.

[0002]

When displaying fresh food such as fish and meat, a sheet called a tray mat is often interposed between the food and the tray. This is mainly for the purpose of making blood coming out of food inconspicuous. As is well known, the tray mat is configured by laminating a resin film such as polyethylene having many pores formed on a base made of nonwoven fabric or the like. Therefore, the blood juice discharged from the food is absorbed by the nonwoven fabric through the pores of the polyethylene film, and does not ooze out to the surface of the polyethylene film again.

[0003] Incidentally, since such tray mats are consumed in large quantities, it is desirable that the cost be as low as possible. However, with the current manufacturing technique, that is, a method of laminating a polyethylene film on a nonwoven fabric supplied from a roll and simultaneously performing a perforation process, no further cost reduction can be expected. Such a situation is also applicable to a composite sheet having both waterproofness and water absorbency used for sanitary products and disposable diapers.

[0004] Accordingly, an object of the present invention is to provide a composite sheet which is easy to manufacture and has excellent productivity. Another object of the present invention is to provide a composite sheet manufacturing technique capable of efficiently obtaining a composite sheet at low cost.

[0005]

An object of the present invention is to provide a composite sheet comprising a base having water absorbency and a linear resin layer provided on at least one side of the base. Will be resolved. Further, the problem is solved by a composite sheet comprising a base having water absorbency and a resin layer provided on at least one surface side of the base so that a part of the base surface is exposed.

[0006] A base having a water-absorbing property, a linear adhesive resin layer provided on one surface side of the base, and a surface material joined to the base via the adhesive resin layer are provided. It is solved by a composite sheet characterized by the following. The adhesive resin layer further includes a base having water absorbency, an adhesive resin layer provided on one surface side of the base, and a surface material joined to the base via the adhesive resin layer. Is solved by a composite sheet characterized in that a part of the surface of the base is exposed when the surface material is not joined to the base.

[0007] Further, a base having water absorbency, a linear bonding resin layer provided on one surface side of the base, a surface material joined to the base via the bonding resin layer, and And a resin layer provided on a surface opposite to the surface to which the surface material is bonded.

Further, a base having water absorbency, an adhesive resin layer provided on one side of the base, a surface material joined to the base via the adhesive resin layer, A resin layer provided on a surface opposite to a surface to which the surface material is bonded, wherein the bonding resin layer has a part of the base surface in a state where the surface material is not bonded to the base. The problem is solved by a composite sheet which is provided so as to be exposed.

In addition, the above object is provided with a nozzle provided to face the base in the middle of a continuous supply path of the base, and a resin supply means for supplying molten resin to the nozzle. A plurality of holes are formed at predetermined intervals along the width direction of the base in a portion of the nozzle facing the base, and a molten resin is discharged from the holes to form a line with respect to the base, Alternatively, the problem is solved by a composite sheet manufacturing apparatus characterized in that a molten resin is applied so that a part of the base surface is exposed.

Alternatively, a base supply means for continuously supplying a base, a nozzle provided to face the base in the middle of a traveling path of the base continuously supplied from the base supply means, A resin supply means for supplying to the nozzle, a pressurizing / cooling means for sandwiching and pressing the base having the surface coated with the molten resin by the nozzle from both sides thereof, and cooling the applied molten resin, and the base And a composite sheet winding means for winding a composite sheet having a resin layer formed on the surface of the nozzle. A portion of the nozzle facing the base has a plurality of holes at predetermined intervals along the width direction of the base. Is formed, and the molten resin is discharged from the holes, so that a line is formed on the base or a part of the base surface is exposed. Molten resin is solved by the composite sheet manufacturing apparatus characterized by being configured to be applied to.

Further, a base supply means for continuously supplying a base, a nozzle provided to face the base in the middle of a traveling path of the base continuously supplied from the base supply means, A resin supply means for supplying a nozzle, a surface material supply means for continuously supplying a surface material, and the base and the surface material having a surface coated with the molten resin by the nozzle, the molten resin facing the surface material While laminating, the laminated body is sandwiched from both sides and pressurized, and the applied molten resin is cooled to join the base and the surface material.
Pressurizing / cooling means, and a composite sheet winding means for winding a composite sheet formed by bonding the surface material to the base via an adhesive resin layer, and a portion of the nozzle facing the base is provided with a composite sheet winding means. A plurality of holes are formed at predetermined intervals along the width direction of the base, and a molten resin is discharged from the holes, so that a line is formed on the base or a part of the surface of the base is exposed. The problem is solved by a composite sheet manufacturing apparatus characterized in that the molten resin is applied in a state where the molten resin is applied.

Further, a base supply means for continuously supplying a base, a first nozzle provided to face the base in the middle of a travel path of the base continuously supplied from the base supply means, First resin supply means for supplying a molten resin to the first nozzle, surface material supply means for continuously supplying a surface material, and the base having a surface coated with the molten resin by the first nozzle; While laminating the surface material with the molten resin facing the surface material, the laminate is sandwiched from both sides and pressed,
Further, the applied molten resin is cooled, and the base and the surface material are joined together to form a composite sheet body.
In the middle of the running path of the composite sheet main body continuously supplied from the pressurizing / cooling unit and the laminating / pressing / cooling unit, the opposing surface of the composite sheet main body is opposite to the surface to which the surface material is joined. A second nozzle, a second resin supply means for supplying a molten resin to the second nozzle, and the composite sheet body having a surface coated with the molten resin by the second nozzle. And a composite sheet winding means for winding a composite sheet in which a resin layer is formed on the surface of the composite sheet body. A plurality of holes are formed at predetermined intervals along the width direction of the base at least in a portion of the first nozzle facing the base, and the molten resin is discharged from the holes. , In a line shape with respect to the base,
Alternatively, the problem is solved by a composite sheet manufacturing apparatus characterized in that a molten resin is applied so that a part of the base surface is exposed.

In the above composite sheet manufacturing apparatus, the diameter and / or interval of the nozzles can be made non-uniform as required. As an example, there are two types of holes, large and small, which are formed alternately.
Further, a valve may be provided for each hole of the nozzle, and the opening degree of the valve may be adjusted so that each hole can discharge a desired amount of the molten resin. Alternatively, the nozzle can be displaceable along the width of the base. The composite sheet manufacturing apparatus of the present invention can form resin layers of various patterns by adding such functions.

Another object of the present invention is to provide a method for manufacturing a composite sheet having a resin layer formed on a surface of a base, wherein the base sheet faces the base in the course of the continuously supplied base. A resin application step of applying the molten resin from the provided nozzle to the base in a line shape or in a state where a part of the base surface is exposed, and the base having the molten resin applied to the surface from both sides thereof And a pressurizing / cooling step of sandwiching and pressing, and cooling the applied molten resin.

Alternatively, there is provided a method for producing a composite sheet in which a surface material is bonded to a base via an adhesive resin layer, wherein the composite sheet faces the base in the middle of a continuously supplied traveling path of the base. A resin application step of applying a molten resin from the provided nozzle to the base in a line shape or in a state in which a part of the base surface is exposed, and the molten resin applied on the surface is continuously supplied to the base. And the surface material is laminated so that the molten resin faces the surface material, and the laminate is sandwiched from both sides thereof and pressed, and the applied molten resin is cooled to form the base and the surface material. Laminating, pressing, joining
And a cooling step.

Further, a composite sheet is produced in which a resin layer is formed on a surface of a composite sheet body formed by bonding a surface material to a base via an adhesive resin layer, the surface being opposite to the surface to which the surface material is bonded. A first nozzle provided to face the base in the middle of a traveling path of the base that is continuously supplied. A first resin application step of applying the resin in a partially exposed state, and laminating the base material coated with the molten resin on the surface thereof and the surface material continuously supplied so that the molten resin faces the surface material, This laminate is sandwiched from both sides and pressurized, and the applied molten resin is cooled to join the base and the surface material to form a composite sheet body. The molten resin is combined from the second nozzle provided in the middle of the traveling path of the composite sheet body that is continuously supplied so as to face the surface opposite to the surface to which the surface material is joined in the composite sheet body. A second resin coating step of coating the sheet body, and pressing the composite sheet body coated with the molten resin from both sides thereof, and cooling the applied molten resin to form a resin layer And a pressurizing / cooling step.

As described above, the composite sheet of the present invention
Instead of attaching a water-repellent resin film to the surface of the base such as nonwoven fabric, directly on the surface of the base,
A line-shaped resin layer is formed. In other words, the resin layer is provided directly on the surface of the base so that a part of the surface of the base is exposed. In such a composite sheet, the liquid penetrates into the base from the portion between the linear resin layers, that is, the portion where the base surface is exposed, and is equivalent to a resin film with holes attached to the entire surface of the base. The function of is exhibited. If the width of the linear resin layer is increased to some extent, that is, if the ratio of the total area of the resin layer to the total area of the composite sheet is equal to or more than a certain value, the liquid permeating the base becomes inconspicuous. Therefore, no problem occurs even when used as a tray mat that plays a role of absorbing blood juice.

Such a composite sheet can be easily manufactured by the above-described apparatus for manufacturing a composite sheet. That is, the molten resin may be discharged from a porous nozzle onto the surface of the base that is continuously supplied and applied. This makes it possible to extremely easily form a linear resin layer on the base surface. Moreover, since this operation can be continuously performed at a high speed, the line speed can be remarkably increased as compared with the prior art, and the productivity can be improved. Therefore, it is possible to provide the composite sheet at a lower cost than before.

Also, a composite sheet composed of a base and a surface material (the same applies to a composite sheet composed of a base, a surface material and a resin layer provided on the side opposite to the surface material) is the same as the conventional hot sheet. No need for melt treatment,
The base and the surface material can be joined by an adhesive resin layer formed very easily on the base surface. Therefore, as in the case where the linear resin layer is provided on the base surface, it can be provided at a lower cost than before.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION A composite sheet described below as a first embodiment of the present invention includes a water-absorbing base and a linear resin layer provided on at least one side of the base. In other words, it is characterized by comprising a base having water absorbency, and a resin layer provided on at least one surface side of the base so as to expose a part of the base surface.

The composite sheet (tray mat) according to the first embodiment will be specifically described with reference to FIGS. FIG. 1 is a perspective perspective view showing a part of the tray mat, and FIG.
FIG. 3 is a sectional view of a main part of the tray mat. The tray mat of the present embodiment includes a nonwoven fabric base 1 and a plurality of rows of resin layers 2 provided on the surface of the base 1.

As can be seen from FIG. 1, the resin layer 2 has a linear shape parallel to each other, and is formed by applying molten low-density polyethylene (LDPE) to the base 1 in a line. . In the present embodiment, as shown in FIG. 2, the interval t between the resin layers 2 is set to 1.
The ratio is set to about 5 to 2 times, but this ratio is set to an arbitrary value, similarly to the thickness of the resin layer 2.

Examples of the material constituting the base 1 include woven fabric, paper and the like in addition to non-woven fabric. Also,
As a resin constituting the resin layer 2, in addition to LDPE,
Low pressure method low density polyethylene (LLDPE), medium density polyethylene (MDPE), high density polyethylene (HDP)
E), polypropylene (PP), polymethylpentene (PMP), ethylene-vinyl acetate copolymer (EV
A), ethylene-ethyl acrylate copolymer (EE
A), ethylene-methyl methacrylate copolymer (EM
MA), ethylene-acrylic acid copolymer (EAA), ionomer (IO), polyethylene terephthalate (P
ET), polybutylene terephthalate (PBT), ethylene-vinyl alcohol copolymer (EVOH), and other adhesive polymers.

In the tray mat configured as described above, blood is absorbed by the base 1 from the portion between the linear resin layers 2. And since it is the part of the resin layer 2 that is in contact with food such as fish and meat, once discharged blood juice does not adhere to the food again, which is sanitary. If the distance between the resin layers 2 is made close to some extent, the blood juice absorbed by the base 1 will not be conspicuous. In addition, since the tray mat can be manufactured very easily using the apparatus described below, it can be provided at a lower cost than before.

Next, an apparatus (first embodiment) used for manufacturing the tray mat will be described. This first
The tray mat (composite sheet) manufacturing apparatus according to the embodiment is provided so as to face the base in a middle of a travel path of the base continuously supplied from the base supply unit that continuously supplies the base. Nozzle and
Resin supply means for supplying the molten resin to the nozzle, pressurizing / cooling means for sandwiching the base having the molten resin applied to the surface by the nozzle from both sides thereof to pressurize, and cooling the applied molten resin And a composite sheet winding means for winding a composite sheet having a resin layer formed on the surface of the base, wherein a portion of the nozzle facing the base has a predetermined interval along a width direction of the base. A plurality of holes are formed, and by discharging the molten resin from the holes, the molten resin is applied to the base in a line shape or in a state where a part of the base surface is exposed. Have been.

The specific structure and function of the tray mat manufacturing apparatus according to the first embodiment will be described below with reference to FIGS. 3 is an overall schematic view of the apparatus, FIG. 4 is a bottom view of the nozzle, FIG. 5 is a cross-sectional view of a main part of the nozzle, and FIG. 6 is a perspective three-dimensional view showing a state where molten resin is applied from the nozzle in a line. is there. Note that, here, the composite sheet manufacturing apparatus of the present invention will be described as a tray mat manufacturing apparatus, but the technology of the present invention is not limited to manufacturing a tray mat,
It can be used for various other purposes.

The tray mat manufacturing apparatus according to the first embodiment comprises:
Mainly, a base supply section 3, a corona discharge processing section 4, a resin application section 5, a pressurization / cooling section 6, and a composite sheet winding section 7
Consists of First, the base supply unit 3, corona discharge treatment unit 4, pressurization / cooling unit 6, and composite sheet winding unit 7 may be used as they are in a known laminating apparatus. Accordingly, only the schematic structure of these components will be described.

The base supply unit 3 includes a nonwoven fabric (base) wound in a roll shape, and the base is continuously supplied to the corona discharge processing unit 4 at a constant speed. The corona discharge treatment section 4 to which the base is continuously supplied performs a treatment for improving the adhesiveness with the resin on the surface of the base by corona discharge. The pressure / cooling unit 6 has a roller pair including a pressure roller 6a and a cooling roller 6b. Usually, the pressure roller 6a is made of rubber, and the cooling roller 6b is made of a metal material. The pressure roller 6a and the cooling roller 6b adhere to each other while sandwiching the base coated with the molten resin by the resin coating unit 5 described later, and rotate in opposite directions. Thus, the molten resin applied to the base surface is pressed against the base, cooled and solidified, and the above-described linear resin layer is formed.

The composite sheet winding section 7 winds a composite sheet having a resin layer formed on a base surface in a roll shape. In addition, immediately before reaching the composite sheet winding unit 7,
A slitter (not shown) is provided. The composite sheet is cut into a predetermined width by the slitter and wound up by the composite sheet winding section 7. The resin application section 5 is mainly supplied from a hopper 5a into which granular resin is charged, a molten resin supply section 5b for heating and melting the resin supplied from the hopper 5a, and a molten resin supply section 5b. A nozzle 5c for applying the molten resin to the base.

The nozzle 5c is provided in the middle of the continuously supplied base traveling path so as to face the base.
As shown in FIG. 4, holes 8 having a uniform diameter are formed at regular intervals in a portion of the nozzle 5c facing the base. The hole 8 exists along the longitudinal direction of the nozzle 5c, that is, the width direction of the base, and the molten resin supplied from the molten resin supply unit 5b is discharged from the hole 8 and applied to the base in a line.

The holes 8 are individually provided in the molten resin supply portions 5b.
5, it is provided branching from a molten resin filling chamber 9 formed in the nozzle 5c, as shown in FIG. Therefore, the molten resin charged under pressure into the molten resin filling chamber 9 is distributed and supplied to each of the holes 8 by a fixed amount. In the apparatus having the above configuration, the tray mat is manufactured as follows.

First, the base is continuously supplied from the base supply unit 3 to the corona discharge treatment unit 4, where a treatment for improving the adhesiveness is performed. Subsequently, a molten resin is applied to the base that has been subjected to the predetermined processing in the corona discharge processing section 4. That is, as shown in FIG. 6, the nozzle 5c provided to face the base B in the middle of the traveling route of the base (indicated by B in FIG. 6).
, A molten resin (indicated by M in FIG. 6) is continuously discharged and applied in a line shape to the base B, in other words, so as to expose a part of the surface of the base B.

The molten resin applied to the base surface in this manner is sandwiched between the pressure roller 6a and the cooling roller 6b and is pressed to be pressed against the base B,
It is cooled and solidified by the action of b. The tray mat having the resin layer formed on the surface of the base B obtained through these steps is cut into a predetermined width by a slitter and wound up in a roll shape by the composite sheet winding section 7. Thereafter, the continuous tray mat is cut into a predetermined length to obtain a product.

As described above, in the tray mat manufacturing apparatus according to the present invention, the molten resin is applied in a line shape to the surface of the continuously supplied base, thereby forming a resin layer. It does not include an unsuitable process, ie, a perforation process. Therefore, the production line speed can be remarkably improved, and the productivity can be greatly improved. Therefore, it is possible to provide the tray mat at a lower cost than before.

In the apparatus of the present invention, if necessary,
The pattern of the resin layer formed on the base can be varied. About this technology,
This will be described in detail in a fifth embodiment. Further, another set of the resin application section 5 and the pressurization / cooling section 6 may be added to the apparatus shown in FIG. That is, two sets of processing mechanisms including the resin application unit 5 and the pressurizing / cooling unit 6 may be provided so that the molten resin is applied to the base twice. By using the device configured as described above, it is possible to form a striped pattern in which colors are alternately changed. However, when two sets of the processing mechanism including the resin coating unit 5 and the pressurizing / cooling unit 6 are provided, the positions of the holes of the first nozzle and the holes of the second nozzle are alternately provided. That is, the holes of the second nozzle are provided at positions where no holes are formed in the first nozzle, that is, at positions between the holes. In such an apparatus, for example, a red resin is supplied to the first nozzle,
By supplying a white resin to the third nozzle, a composite sheet having a resin layer colored red and white can be obtained.

Next, a second embodiment of the composite sheet according to the present invention will be described with reference to FIG. FIG. 7 shows a part of a sheet cut to a predetermined width (the same applies to the composite sheets described in the third to fifth embodiments). The structure of the composite sheet of the second embodiment is basically the same as that of the first embodiment. That is, a base 10 made of a nonwoven fabric and a resin layer 1 provided on the surface of the base 10
It consists of 1. However, this is different from the composite sheet of the first embodiment in that the resin layer 11 is formed discontinuously instead of being continuous, in other words, the base 10 is configured to be exposed in a lattice shape.

Next, an apparatus (second embodiment) used for manufacturing the composite sheet of the second embodiment will be described with reference to FIG.
This will be described with reference to FIG. However, the basic structure of this device is
Since it is the same as that of the first embodiment, FIG. 8 shows only the main part of the apparatus. The composite sheet manufacturing apparatus according to the second embodiment is characterized in that a valve 13 is provided immediately before a nozzle 12. Thereby, in the apparatus of the present embodiment, the discharge amount of the molten resin can be easily controlled.

When manufacturing the composite sheet of the second embodiment, the valve 13 is opened for a certain time and then closed for an equivalent time. By repeating this opening / closing operation, the base B is intermittently coated with the molten resin. The base B coated with the molten resin in this manner is subjected to pressure bonding and solidification of the molten resin by the pressing roller 14a and the cooling roller 14b. Thus, the composite sheet shown in FIG. 7 is obtained.

Next, a third embodiment of the composite sheet according to the present invention will be described with reference to FIG. The composite sheet according to the third embodiment includes a base 15 made of a nonwoven fabric, a narrow linear resin layer 16a provided on the surface of the base 15, and a wide linear resin layer 16b. That is, the difference from the composite sheet of the first embodiment is that the width of the resin layer is not made uniform and two types, large and small, are alternately provided. In the present embodiment, the distance between the resin layer 16a and the resin layer 16b is made uniform. However, this distance can be made uneven if necessary.

Next, an apparatus (third embodiment) used for manufacturing the composite sheet of the third embodiment will be described with reference to FIG.
Explanation will be made using 0. However, since this device also has the same basic structure as that of the first embodiment, FIG. 10 shows only a main part (nozzle bottom surface) of the device. Also, the manufacturing process is basically the same as that of the first embodiment, and only the differences will be described below.

The composite sheet manufacturing apparatus according to the third embodiment is characterized in that the nozzle 17 has two types of nozzle holes, large and small, that is, the diameter of the hole from which the molten resin is discharged in the nozzle 17 is not uniform. . That is, the nozzle 17 has a small-diameter hole 18a and a large-diameter hole (for example, the hole 18a).
and holes 18b having a size (about twice as large as a). Therefore, the molten resin discharged from the small-diameter hole 18a becomes the narrow resin layer 16 in the composite sheet.
a, while the molten resin discharged from the large-diameter hole 18b forms a wide resin layer 16b. Thus, the composite sheet shown in FIG. 9 is obtained.

Next, a fourth embodiment of the composite sheet according to the present invention will be described with reference to FIG. The composite sheet according to the fourth embodiment includes a base 19 made of a nonwoven fabric and a resin layer 20 provided on the surface of the base 19. However, each of the resin layers 20 does not have a uniform width as in the first embodiment, but includes a linear narrow portion 20a and a circular wide portion 20b. That is, the difference from the composite sheet of the first embodiment is that the width of one resin layer is not uniform. The resin layer 20 is formed so as to be shifted in every other row so that the wide portions 20b do not interfere with each other, in other words, in order that the wide portions 20b adjacent to each other do not overlap with each other.

Next, an apparatus (fourth embodiment) used for manufacturing the composite sheet of the fourth embodiment will be described with reference to FIG.
2 will be described. However, this device also has the same basic structure as that of the first embodiment, and FIG. 12 shows only a main part (nozzle cross section) of the device. Also, the manufacturing process is basically the same as that of the first embodiment, and therefore only the differences will be described.

In the composite sheet manufacturing apparatus according to the fourth embodiment, a valve 23 (23 ') is provided for each of the holes 22 of the nozzle 21, and by adjusting the opening of the valve 23 (23'),
Each of the holes 23 (23 ') is configured to discharge a desired amount of molten resin. Then, for example, when the opening degree of the valve 23 in the odd-numbered row is increased, the valve 23 ′ in the even-numbered row is set to the normal opening degree, and conversely, the valve 23 ′ in the even-numbered row is changed. When the opening is increased, the valves 23 in the odd-numbered rows are set to the normal opening.
By such operations, the composite sheet shown in FIG. 11 is obtained. Needless to say, the linear narrow portion 2
0a is formed when the valve 23 (23 ') is set to the normal opening degree, and the circular wide portion 20b is formed when the opening degree of the valve 23 (23') is set to be larger than normal.

The composite sheet of the fourth embodiment is shown in FIG.
It can also be obtained by using an apparatus showing the main part (nozzle cross section).
In this apparatus, two independent molten resin filling chambers (a first molten resin filling chamber 25a and a second molten resin filling chamber 25b) are provided inside a nozzle 24. Then, the holes 26a in the odd-numbered rows are connected to the first molten resin filling chamber 25a, while the holes 26b in the even-numbered rows are connected.
Is connected to the second molten resin filling chamber 25b. Furthermore,
Valves 27a and 27b are provided immediately before the first and second molten resin filling chambers 25a and 25b, respectively. Therefore, in this device, a composite sheet as shown in FIG. 11 is obtained by alternately increasing the opening degrees of the valves 27a and 27b.

Next, a fifth embodiment of the composite sheet according to the present invention will be described with reference to FIG. The composite sheet according to the fifth embodiment includes a base 28 made of a nonwoven fabric and a resin layer 29 provided on the surface of the base 28. However, the resin layer 28 is not a linear one as in the first embodiment, but a wavy one having a constant amplitude and pitch. In the present embodiment, the distance between the resin layers 29 is constant. However, the amplitude and pitch of one resin layer 29 can be appropriately changed according to the usage mode, and the interval between the resin layers 29 can be arbitrarily changed.

Next, an apparatus (fifth embodiment) used for manufacturing the composite sheet of the fifth embodiment shown in FIG. 14 will be described with reference to FIG. However, since this device also has basically the same configuration as that of the first embodiment, FIG. 15 shows only a main part (front of the nozzle) of the device. Also, the manufacturing process is almost the same as that of the first embodiment, and only the differences will be described.

The composite sheet manufacturing apparatus of the fifth embodiment is configured so that the nozzle 30 can move (reciprocate) along the width direction of the base B (the horizontal direction in FIG. 15).
The number of holes of the nozzle 30 is set smaller than that of the composite sheet manufacturing apparatus described above in which the nozzle does not shift. The width of the nozzle 30, that is, the dimension of the nozzle 30 along the width direction of the base B is smaller than the width of the base B itself.

In the apparatus having the above-mentioned structure, if the reciprocating speed of the nozzle 30 is increased while the transport speed of the base B is kept constant, the pitch of the wave is reduced. Pitch becomes larger. Also,
The amplitude of the wave depends on the reciprocating width of the nozzle 30. In addition,
A similar process can be realized by fixing the nozzle 30 and displacing the base B along its own width direction. However, it is preferable to shift the nozzle side as shown in the figure from the viewpoint of the structural limitation of the apparatus and the efficiency.

Next, a sixth embodiment of the composite sheet according to the present invention will be described. The composite sheet of the sixth embodiment has a water-absorbing base, a linear bonding resin layer provided on one surface side of the base, and a surface bonded to the base via the bonding resin layer. Material. The composite sheet of the sixth embodiment will be described in more detail with reference to FIGS. FIG. 16 is a perspective perspective view showing a part of the composite sheet, and FIG. 17 is a sectional view of a main part of the composite sheet.

The structure of the composite sheet of this embodiment is shown in FIG.
As shown in FIG. That is, the nonwoven base 3
1. A plurality of rows of linear bonding resin layers 32 provided on the surface of the base 31 and, as can be seen from FIG. 17, a polyethylene film (surface material) bonded to the base 31 via the bonding resin layer 32 33. However, FIG.
6 shows a state in which the polyethylene film 33 is partially peeled (FIG. 19 showing the seventh embodiment).
The same applies to).

In the composite sheet of the sixth embodiment,
The bonding resin layers 32 are linear in parallel with each other, and are formed by applying molten low-density polyethylene to the base 31 in a line. After the composite sheet having the above configuration is cut into a predetermined shape, the composite sheet is joined by an appropriate means (for example, heat fusion) and processed into a paper diaper or the like.

Incidentally, in the composite sheet of the present embodiment,
It can be manufactured very easily using the apparatus described below. Therefore, it can be provided at a lower cost than a conventional product having the same function. Subsequently, an apparatus (sixth embodiment) used for manufacturing the composite sheet will be described.

The composite sheet manufacturing apparatus according to the sixth embodiment has a base supply means for continuously supplying a base and a base which is continuously supplied from the base supply means such that the base is opposed to the base. A nozzle provided, a resin supply means for supplying a molten resin to the nozzle, a surface material supply means for continuously supplying a surface material, the base and the surface material having a surface coated with the molten resin by the nozzle And a laminate in which the molten resin is opposed to the surface material, and the laminate is sandwiched from both sides and pressed, and the applied molten resin is cooled to join the base and the surface material. A pressure / cooling means, and a composite sheet winding means for winding a composite sheet formed by bonding the surface material to the base via an adhesive resin layer; A plurality of holes are formed at predetermined intervals along a width direction of the base in a portion facing the base in, and by discharging molten resin from the holes, in a line shape with respect to the base, or The molten resin is applied so that a part of the base surface is exposed.

Hereinafter, the composite sheet manufacturing apparatus according to the sixth embodiment will be described in detail with reference to FIG. In the composite sheet manufacturing apparatus according to the sixth embodiment, the schematic configuration of which is shown in FIG. 18, the base supply unit 34,
Corona discharge processing section 35, resin application section 36, laminating / pressing /
A cooling section 37 and a composite sheet winding section 38 are provided. These components are basically the same as those described in the first embodiment, and a description thereof will be omitted.

The composite sheet manufacturing apparatus of this embodiment is characterized in that it has a polyethylene film supply section 39 in addition to the above-mentioned components. The polyethylene film supply section 39 includes a polyethylene film (surface material) wound in a roll shape, and is configured to continuously supply the polyethylene film to the corona discharge processing section 35 at a constant speed.

In the apparatus having the above structure, a composite sheet is manufactured as follows. First, the base is continuously supplied from the base supply unit 34 to the corona discharge processing unit 35, where a process for improving the adhesiveness is performed. Subsequently, a molten resin is applied in a line by the resin application unit 36 to the base on which the predetermined processing has been performed in the corona discharge processing unit 35.

Subsequently, the base coated with the molten resin is:
It is laminated with the polyethylene film continuously supplied from the polyethylene film supply section 39. At this time, the polyethylene film is combined with the base so as to face the molten resin applied to the base. The laminated body thus obtained is sandwiched and pressed by the roller pair of the laminating / pressing / cooling unit 37 from both sides thereof, and the molten resin is cooled. As a result, the base and the polyethylene film are joined to form a composite sheet.

Further, the composite sheet is cut into a predetermined width by a slitter, and is wound into a roll by a composite sheet winding section 38. As described above, in the composite sheet manufacturing apparatus according to the sixth embodiment, a molten resin is applied in a line to the surface of a base that is continuously supplied, and thereby a bonding resin layer is formed. Therefore, it is suitable for high-speed processing, is extremely easy to manufacture as compared with the conventional technology including hot-melt processing, and can greatly increase the production line speed. At the same time, simplification of the apparatus can be realized, so that the composite sheet can be provided at a lower cost than before. Next, a seventh embodiment of the composite sheet according to the present invention will be described.

The composite sheet according to the seventh embodiment has a water-absorbing base, a line-shaped bonding resin layer provided on one surface of the base, and a bond to the base via the bonding resin layer. And a resin layer provided on a surface of the base opposite to a surface to which the surface material is joined. However, the resin layer provided on the surface opposite to the surface material may be linear or planar.

The composite sheet of the seventh embodiment will be described in more detail with reference to FIGS. 19 is a perspective perspective view showing a part of the composite sheet, and FIG. 20 is a sectional view of the composite sheet. The configuration of the composite sheet of the present embodiment is as follows:
This is as shown in FIG. That is, the base 40 made of nonwoven fabric, a plurality of rows of linear bonding resin layers 41 provided on the surface of the base 40, and as shown in FIG. A polyethylene film (surface material) 42 is provided. Furthermore,
In the present embodiment, a planar resin layer 43 is provided on the surface opposite to the surface material 42. In the present embodiment, the resin layer 43
Although it was made to have air permeability, depending on the use of the composite sheet,
Instead, airtightness or moistureproofness may be imparted.

Even in the composite sheet of the seventh embodiment, the adhesive resin layers 41 are linear in parallel with each other, and the low-density polyethylene melt is applied to the base 40 in a line. It is formed with. The composite sheet of the present embodiment can also be manufactured very easily using the apparatus described below, so that it can be provided at a lower cost than a conventional product having the same function.

Next, an apparatus (seventh embodiment) used for manufacturing the composite sheet will be described. The composite sheet manufacturing apparatus according to the seventh embodiment is provided so as to face the base in the middle of a traveling path of the base continuously supplied from the base supplying means and the base continuously supplying the base. A first nozzle, a first resin supply unit for supplying the molten resin to the first nozzle, a surface material supply unit for continuously supplying a surface material, and the molten resin on the surface by the first nozzle. The applied base and the surface material are laminated so that the molten resin faces the surface material, and the laminated body is sandwiched and pressed from both sides thereof, and the applied molten resin is cooled, and the base material is cooled. And a laminating / pressing / cooling means for forming a composite sheet main body, and in the middle of a traveling path of the composite sheet main body continuously supplied from the laminating / pressing / cooling means. A second nozzle provided to face a surface of the composite sheet body opposite to a surface to which the surface material is bonded, a second resin supply unit configured to supply a molten resin to the second nozzle, Pressurizing and cooling means for sandwiching and pressing the composite sheet body having the surface coated with the molten resin from both sides by the nozzle of No. 2 and cooling the applied molten resin; A composite sheet winding means for winding a composite sheet having a layer formed thereon, wherein at least a portion of the first nozzle facing the base has a plurality of holes at predetermined intervals along a width direction of the base. Is formed, and by discharging the molten resin from the holes, the molten resin is applied to the base in a line shape or in a state where a part of the base surface is exposed. It is configured.

Hereinafter, the composite sheet manufacturing apparatus according to the seventh embodiment will be described in detail with reference to FIG. The composite sheet manufacturing apparatus of the seventh embodiment whose schematic configuration is shown in FIG. 21 is characterized by including two sets of a resin application section and a pressure / cooling section. That is, the composite sheet manufacturing apparatus according to the present embodiment includes a base supply unit 44, a corona discharge treatment unit 45, a first resin application unit 46, a laminating / pressing / cooling unit 47, a polyethylene film supply unit 48, a composite sheet winding unit In addition to the section 49, a second resin application section 50 and a pressure / cooling section 51 are provided.

The first resin application section 45 and the second resin application section 49 are basically the same, but differ from each other in the structure of the nozzle portion. That is, the first resin coating unit 46
A plurality of holes for discharging the molten resin are formed at predetermined intervals along the width direction in a portion of the nozzle facing the base. On the other hand, a slit is formed along the width direction of the base at a portion of the nozzle of the second resin coating unit 50 facing the base. For this reason, the resin layer formed by the second resin coating unit 50 is not a line but a plane as described above.

The pressurizing / cooling unit 51 has almost the same structure as the laminating / pressing / cooling unit 47, and differs in whether or not the polyethylene film is sandwiched, that is, whether or not it is involved in the formation of the laminate. Only. Therefore, detailed description is omitted. In the apparatus having the above configuration, a composite sheet is manufactured as follows. First, similarly to the sixth embodiment, the base and the polyethylene film are joined to form a composite sheet main body. However, in the apparatus of the present embodiment, the upper and lower sides of the composite sheet main body are opposite to those of the sixth embodiment. That is, the composite sheet main body is transported with the base positioned on the upper side and the polyethylene film positioned on the lower side.

Subsequently, on the entire upper surface of the composite sheet body,
The second resin application section 50 applies the molten resin.
Thereafter, the pressing / cooling unit 51 presses and cools the composite sheet body on which the molten resin is applied, and forms a planar resin layer on the surface. A composite sheet in which a planar resin layer is formed on the surface of the composite sheet body in this way,
The sheet is cut into a predetermined width by a slitter, and then wound into a roll by a composite sheet winding section 49.

As described above, the composite sheet manufacturing apparatus of the seventh embodiment also applies a molten resin in a line to the surface of a continuously supplied base, thereby forming an adhesive resin layer. Therefore, it is suitable for high-speed processing, and is extremely easy to manufacture as compared with the prior art including hot melt processing. Therefore, the production efficiency can be improved, and the composite sheet can be provided at a lower cost than before.

[0069]

The composite sheet according to the present invention is easy to manufacture and excellent in productivity. Further, since the composite sheet manufacturing technique according to the present invention is suitable for high-speed processing, it is possible to efficiently obtain a composite sheet, and thereby it is possible to provide a composite sheet at a lower cost than before.

[Brief description of the drawings]

FIG. 1 is a perspective perspective view showing a part of a composite sheet (first embodiment).

FIG. 2 is a sectional view of a main part of a composite sheet (first embodiment).

FIG. 3 is an overall schematic view of a composite sheet manufacturing apparatus (first embodiment).

FIG. 4 is a bottom view of a nozzle portion in the composite sheet manufacturing apparatus (first embodiment).

FIG. 5 is a sectional view of a main part of a nozzle portion in the composite sheet manufacturing apparatus (first embodiment).

FIG. 6 is a perspective perspective view showing a state in which a molten resin is applied to a base in a line shape.

FIG. 7 is a plan view showing a part of a composite sheet (second embodiment).

FIG. 8 is a side view of a main part of a composite sheet manufacturing apparatus (second embodiment).

FIG. 9 is a plan view showing a part of a composite sheet (third embodiment).

FIG. 10 is a bottom view of a main part of a composite sheet manufacturing apparatus (third embodiment).

FIG. 11 is a plan view showing a part of a composite sheet (fourth embodiment).

FIG. 12 is a sectional view of a main part of a nozzle portion of a composite sheet manufacturing apparatus (fourth embodiment).

FIG. 13 is a sectional view showing another embodiment of the nozzle portion of the composite sheet manufacturing apparatus (fourth embodiment).

FIG. 14 is a plan view showing a part of a composite sheet (fifth embodiment).

FIG. 15 is a front view of a main part of a composite sheet manufacturing apparatus (fifth embodiment).

FIG. 16 is a perspective perspective view showing a part of a composite sheet (sixth embodiment).

FIG. 17 is a sectional view of a main part of a composite sheet (sixth embodiment).

FIG. 18 is an overall schematic view of a composite sheet manufacturing apparatus (sixth embodiment).

FIG. 19 is a perspective perspective view showing a part of a composite sheet (seventh embodiment).

FIG. 20 is a sectional view of a composite sheet (seventh embodiment).

FIG. 21 is an overall schematic view of a composite sheet manufacturing apparatus (seventh embodiment).

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 base 2 resin layer 3 base supply section 4 corona discharge treatment section 5 resin application section 5b molten resin supply section 5c nozzle 6 pressurization / cooling section 6a pressure roller 6b cooling roller 7 composite sheet winding section 8 hole 9 molten resin filling Chamber M molten resin

Claims (16)

[Claims] 1. A composite sheet comprising: a base having water absorbency; and a linear resin layer provided on at least one surface side of the base. 2. A composite sheet comprising: a base having water absorbency; and a resin layer provided on at least one side of the base so that a part of the base surface is exposed. 3. A base having water absorbency, a linear adhesive resin layer provided on one surface side of the base, and a surface material joined to the base via the adhesive resin layer. A composite sheet comprising: 4. A base having a water-absorbing property, an adhesive resin layer provided on one surface side of the base, and a surface material joined to the base via the adhesive resin layer. The composite sheet, wherein the resin layer for use is provided so that a part of the surface of the base is exposed when the surface material is not joined to the base. 5. A base having water absorbency, a linear bonding resin layer provided on one surface side of the base, a surface material bonded to the base via the bonding resin layer, and the base And a resin layer provided on a surface opposite to a surface to which the surface material is bonded. 6. A base having water absorbency, an adhesive resin layer provided on one surface side of the base, a surface material joined to the base via the adhesive resin layer, and the surface of the base A resin layer provided on a surface opposite to a surface to which the material is bonded, wherein the bonding resin layer exposes a part of the base surface when the surface material is not bonded to the base. A composite sheet characterized by being provided so that 7. A nozzle provided to face the base in the middle of a traveling path of the base that is continuously supplied, and a resin supply unit that supplies molten resin to the nozzle, wherein: A plurality of holes are formed at predetermined intervals along the width direction of the base in the opposed portions, and by discharging the molten resin from the holes, a line is formed on the base or on the surface of the base. A composite sheet manufacturing apparatus characterized in that a molten resin is applied so that a part thereof is exposed. 8. A base supply means for continuously supplying a base, a nozzle provided to face the base in the middle of a traveling path of the base continuously supplied from the base supply means, A resin supply means for supplying to the nozzle, a pressurizing / cooling means for sandwiching the base having the molten resin applied to the surface by the nozzle from both sides thereof and applying pressure, and cooling the applied molten resin; and the base And a composite sheet winding means for winding a composite sheet having a resin layer formed on a surface of the nozzle. A plurality of holes are provided at predetermined intervals along a width direction of the base in a portion of the nozzle facing the base. By discharging the molten resin through the holes, the molten resin is melted in a line shape with respect to the base or in a state where a part of the base surface is exposed. Composite sheet manufacturing apparatus and a resin is configured to be applied. 9. A base supply means for continuously supplying a base, a nozzle provided to face the base in the middle of a travel path of the base continuously supplied from the base supply means, A resin supply means for supplying a nozzle, a surface material supply means for continuously supplying a surface material, and a molten resin facing the surface material with the base and the surface material coated on the surface by the nozzle. While stacking, the laminate is sandwiched and pressed from both sides and pressed, and the applied molten resin is cooled, and the stacking, pressing, and joining the base and the surface material are performed.
A cooling means; and a composite sheet winding means for winding a composite sheet formed by bonding the surface material to the base via an adhesive resin layer, wherein a portion of the nozzle facing the base includes the base. A plurality of holes are formed at predetermined intervals along the width direction of the base material, and a molten resin is discharged from the holes, so that a line is formed on the base or a state in which a part of the base surface is exposed. A composite sheet manufacturing apparatus configured to apply a molten resin. 10. A base supply means for continuously supplying a base, a first nozzle provided to face the base in the middle of a travel path of the base continuously supplied from the base supply means, First resin supply means for supplying a resin to the first nozzle, surface material supply means for continuously supplying a surface material, the base having a molten resin applied to a surface thereof by the first nozzle, and A surface material is laminated so that the molten resin faces the surface material, and the laminate is sandwiched from both sides and pressed, and the applied molten resin is cooled to join the base and the surface material. A laminating / pressing / cooling means for forming the composite sheet body; and a laminating / pressing / cooling means which is continuously supplied from the laminating / pressing / cooling means. A second nozzle provided so as to face a surface opposite to a surface to which the surface material is joined, a second resin supply means for supplying a molten resin to the second nozzle, and a second nozzle The composite sheet body coated with molten resin on its surface is sandwiched from both sides and pressed,
A pressurizing / cooling unit for cooling the applied molten resin; and a composite sheet winding unit for winding a composite sheet having a resin layer formed on a surface of the composite sheet body, wherein at least the first In a portion of the nozzle facing the base, a plurality of holes are formed at predetermined intervals along the width direction of the base, and the molten resin is discharged from these holes to form a line with respect to the base. Alternatively, the composite sheet manufacturing apparatus is configured such that the molten resin is applied so that a part of the base surface is exposed. 11. The nozzle according to claim 7, wherein diameters and / or intervals of the holes of the nozzle are non-uniform.
0. The composite sheet manufacturing apparatus according to any one of the above items. 12. A nozzle is provided with an individual valve in a hole thereof, and the opening of the valve is adjusted so that each of the holes can discharge a desired amount of molten resin. The composite sheet manufacturing apparatus according to any one of claims 7 to 11. 13. The composite sheet manufacturing apparatus according to claim 7, wherein the nozzle is configured to be displaceable along a width direction of the base. 14. A method for producing a composite sheet in which a resin layer is formed on a surface of a base, comprising: a nozzle provided so as to face the base in the middle of a continuously supplied traveling path of the base. A resin application step of applying the molten resin to the base in a line shape or a state in which a part of the base surface is exposed, and pressing the base having the surface coated with the molten resin from both sides thereof and applying pressure, And a pressurizing / cooling step of cooling the applied molten resin. 15. A method for producing a composite sheet in which a surface material is joined to a base via an adhesive resin layer, wherein the composite sheet faces the base in the middle of a continuously supplied traveling path of the base. A resin application step of applying the molten resin to the base in a line shape or in a state where a part of the base surface is exposed from a nozzle provided, and a continuous supply with the base having the molten resin applied to the surface. And the surface material is laminated so that the molten resin faces the surface material, and the laminate is sandwiched from both sides thereof and pressed, and the applied molten resin is cooled to form the base and the surface material. And a laminating / pressing / cooling step of bonding the composite sheets. 16. A composite sheet in which a resin layer is formed on a surface of a composite sheet body obtained by bonding a surface material to a base via an adhesive resin layer, the surface being opposite to the surface to which the surface material is bonded is manufactured. A first nozzle provided to face the base in the course of the continuously supplied base so that molten resin is linearly applied to the base, A first resin application step of applying the resin in a state where the portion is exposed; and a step of laminating the base having the surface coated with the molten resin and the surface material continuously supplied so that the molten resin faces the surface material. A stacking / pressing / cooling step of sandwiching and pressing the laminate from both sides and cooling the applied molten resin to join the base and the surface material to form a composite sheet body The molten resin is supplied from a second nozzle provided in the middle of a traveling path of the composite sheet body that is continuously supplied so as to face a surface of the composite sheet body opposite to a surface to which the surface material is joined. A composite resin body having a surface coated with a molten resin, pressurizing the composite sheet body from both sides thereof, and cooling the applied molten resin to form a resin layer. A method for producing a composite sheet, comprising a pressure / cooling step.