JP2582769Y2 - Wiping cloth manufacturing equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manufacturing apparatus for improving the appearance of a wiping cloth useful as a disposable hand wipe, a wet tissue, a wiper, a disposable rag and the like.

[0002]

2. Description of the Related Art Conventionally, as a wiping cloth such as a disposable hand wiping cloth, a dry pulp sheet in which pulp fibers are accumulated in a bulky manner is impregnated with water or a chemical.
However, the dry pulp sheet has a drawback that it has low wet strength after being impregnated with water, chemicals and the like, and is easily broken during use.

[0003] On the other hand, a nonwoven fabric obtained by accumulating rayon fibers, which are hydrophilic fibers, and then bonding the rayon fibers together with a rubber-based binder is impregnated with water or the like. This wiping cloth exhibits high wettability because the rayon fibers are bonded together, but has an unpleasant odor because it contains a rubber-based binder, and furthermore, the wiping cloth has a rough touch due to the rubber-based binder. There was a drawback that the feeling of use was poor. For this reason, attempts have been made to use a nonwoven fabric in which rayon fibers are bonded to each other without using a rubber-based binder. For the entanglement between the rayon fibers, it is conceivable to apply a high-pressure water column flow to the web on which the rayon fibers are accumulated. However, rayon fibers are excellent in hydrophilicity, and when used as a wiping cloth, they have a fatal disadvantage that they absorb water well and swell, and their rigidity is extremely reduced.

[0004] For this reason, the applicant of the present invention has conducted research to overcome the above-mentioned drawbacks. As a result, after laminating a long-fiber web composed of hydrophobic long fibers and a paper sheet composed of pulp fibers, the paper of the laminate is formed. By applying a high-pressure water column flow from the sheet side toward the long fiber web side, the wiping cloth obtained by entanglement of the long fibers and the pulp fibers has found that the above-mentioned disadvantages are not present,
Earlier, we applied for a patent. (Japanese Patent Application 4-89650
No., Japanese Patent Application No. 4-194760). However, even with the above-mentioned wipes, difficulties to be solved have been found. That is, when a paper sheet is laminated on the surface of a long-fiber nonwoven fabric, and a high-pressure water column flow is applied to the laminate so as to penetrate from the paper sheet side to the long-fiber nonwoven fabric side of the laminate, the paper sheet is significantly destroyed, In some cases, pulp fibers constituting the paper sheet are scattered in the air, and the pulp fibers adhere to the side and bottom surfaces of the high-pressure water column flow device. Since the pulp fibers adhering to the high-pressure water column flow device are accumulated and fall on the laminate to form white spots, there is a problem that only a wiping cloth having an uneven formation can be obtained.

[0005]

In view of the above situation, an object of the present invention is to provide a pulp fiber constituting a paper sheet even when a paper sheet and a long fiber web are laminated and subjected to a high-pressure water column flow. It is an object of the present invention to provide an improved apparatus which can obtain a uniform wiping cloth having no white spots without scattering and adhering to side and bottom surfaces of a high pressure water column flow device.

[0006]

SUMMARY OF THE INVENTION The object of the present invention is to provide an apparatus for manufacturing a wiping cloth according to the present invention, that is, a long fiber web in which hydrophobic and thermoplastic long fibers are accumulated, comprising a large number of pulp fibers on one surface. A wiping cloth comprising a conveyor for transferring a long sheet-like laminate formed by stacking paper sheets, and a device for applying a high-pressure water column flow to the paper sheet side of the long sheet-like laminate being transferred by the conveyor. Is provided with a water spray device comprising a plurality of flat spray nozzles arranged in a row in the width direction of the long sheet-like laminate, directly above the high-pressure water column flow treatment device. This is achieved by a wiping cloth manufacturing apparatus.

In the practice of the present invention, a long-fiber web formed by laminating hydrophobic and thermoplastic long fibers is used. For example, such a long fiber web can be obtained by melt spinning a hydrophobic and thermoplastic resin to obtain long fibers, and depositing the long fibers on a collection conveyor. Here, as long fibers, for example, polyolefin-based long fibers, polyester-based long fibers, polyamide-based long fibers, polyacrylate long fibers, and the like can be used.

The fineness of the long fiber is preferably from 1 to 4 denier. When the fineness of the long fiber exceeds 4 denier, the flexibility of the long fiber web is reduced, and the feeling of use when used as a wiping cloth tends to be reduced. Conversely, if the fineness of the long fiber is less than 1 denier, strict conditions are required for the production of the long fiber, and it becomes difficult to efficiently produce the long fiber and thus the long fiber web at a high speed.

The basis weight of the long fiber web is 5 to 30 g / m ^2.
Is preferred. In particular, 5 to 20 g / m ² is most preferable.
When the basis weight of the long fiber web exceeds 30 g / m ² , the paper sheet is laminated even if a paper sheet is laminated on one side of the long fiber web and subjected to a high-pressure water column flow from the paper sheet side toward the long fiber web side. The constituent pulp fibers hardly move to the back surface (non-laminated surface with the paper sheet) of the long fiber web, and the difference in water absorbency in the thickness direction is likely to occur. Conversely, when the basis weight of the long fiber web is less than 5 g / m ² , there is a tendency that the form stability of the long fiber web is reduced and the wet strength of the obtained wiping cloth is reduced. Furthermore, when the gap between the long fibers becomes large and a high-pressure water column flow is applied, pulp fibers flow out of the gap, and when the used high-pressure water column flow is recovered, the pulp fibers in the high-pressure water column flow are removed. There is a risk of contamination in large quantities.

The long-fiber web used in the practice of the present invention may be a so-called long-fiber nonwoven fabric in which the long fibers are self-fused, or a fleece-like non-bonded long fiber. It may be a long fiber fleece. In particular, among the former long-fiber nonwoven fabrics, it is preferable to use a nonwoven fabric in which a large number of spot-fused portions where self-fused between long fibers are fused are distributed in a scattered manner. The reason for this is that, because of the point-fused portion where the long fibers are self-fused, the shape stability is excellent, and the self-fusing between the long fibers in the portions other than the point-fused portion. This is because they are accumulated in a free state, and are excellent in flexibility and easily entangled with pulp fibers.

A paper sheet is laminated on one side of the long fiber web prepared as described above. This paper sheet is composed of many pulp fibers. As the paper sheet, any conventionally known paper sheet can be used. The basis weight of the paper sheet is also arbitrary and not particularly limited,
In particular, a paper sheet having a basis weight of 10 to 80 g / m ² measured by the method described in JIS P 8124 is preferable. When the basis weight of the paper sheet is less than 10 g / m ² , the absolute amount of pulp fibers is small, and it tends to be difficult to provide the obtained wiping cloth with sufficient absorbency and water retention. Conversely, if the basis weight of the paper sheet exceeds 80 g / m ² , the overall basis weight of the obtained wiping cloth tends to be too large, and the flexibility of the wiping cloth tends to decrease.

The pulp fibers constituting the paper sheet include:
Coniferous and hardwood timber is crafted, sulphite processed,
Unbleached pulp fibers or bleached pulp fibers pulverized by a soda method, a polysulfide method or the like, or mechanical pulp fibers such as ground pulp fibers, chemimechanical pulp fibers, and thermomechanical pulp fibers can be used alone or in combination. . When mixed and used,
The weight ratio of softwood pulp fiber to hardwood pulp fiber is
Preferably, softwood pulp resin / hardwood pulp resin = 1
00-20 / 0-80, more preferably 100-40
/ 0 to 60. When the hardwood pulp exceeds 80%, not only the amount of pulp disappeared due to the high-pressure water column flow increases, but also the flexibility of the sheet after entanglement tends to decrease.

The density of the paper sheet used in the practice of the present invention (measured by the method shown in JIS P 8118)
Is preferably 0.6 g / cm ³ or less. When the density of the paper sheet exceeds 0.6 g / cm ³ , the motion of the pulp fiber is suppressed when a high-pressure water column flow is applied from above the paper sheet,
The entanglement between the long fiber and the pulp fiber tends to be insufficient, and the flexibility of the entangled sheet tends to decrease.

This paper sheet is laminated on one side of a long fiber web prepared in advance. At this time, the ratio of the basis weight of the long-fiber web to the basis weight of the paper sheet (measured by the method shown in JIS P 8124) is as follows: long-fiber web: paper sheet = 1:
It is preferable that the ratio be 1 to 1:19. When the ratio of long fiber web: paper sheet is less than 1: 1, the amount of pulp fiber is relatively reduced with respect to the amount of long fiber, and the absorbability and water retention of the obtained wiping cloth tend to decrease. Further, the amount of inexpensive pulp fibers is smaller than that of long fibers, so that the obtained wiping cloth itself becomes expensive. Conversely, if the basis weight of the paper sheet exceeds 1: 19 and the basis weight of the paper sheet exceeds 1:19, all of the pulp fibers constituting the paper sheet hardly become entangled with the long fibers, and the obtained wiping is performed. When the cloth is used wet, the pulp fiber tends to fall off.

After laminating the paper sheet on one side of the long fiber web, the obtained long laminate is placed on a transfer conveyor 4 made of a water-permeable material such as a wire mesh as shown in FIG. The long laminate is subjected to a high-pressure water column flow from the paper sheet side to the long fiber web side. That is, the high-pressure water column flow is applied such that the high-pressure water column flow penetrates from the paper sheet side of the laminate to the long fiber web side. This high-pressure water column flow is shown in FIG.
Water is jetted at a high pressure through a nozzle hole having a fine diameter of a high-pressure water column flow treatment device as shown in FIG. For example,
Through a nozzle hole with a hole diameter of about 0.01 to 0.3 mm, 2
It is obtained by squirting water at a pressure of about 0 to 150 kg / cm ² .

When this high pressure water column stream is applied to the laminate, the high pressure water column stream collides with the paper sheet. The paper sheet first adheres to the long-fiber web, and then, in this state, the paper sheet is broken, the pulp fibers constituting the paper sheet are isolated, and the pulp fibers undergo deformation such as bending or twisting. At the same time as giving sufficient kinetic energy to the pulp fiber to cause random motion in the pulp fiber. As a result, the pulp fibers and the long fibers in the long fiber web are entangled by these combined actions, and the long fibers are also entangled by the pulp fibers.

In the present invention, water is sprayed from right above the high-pressure water column flow treatment device to an elongated region extending in the width direction covering the device. When a high-pressure water column flow is applied to the laminate, the paper sheet is broken, and a part of the pulp fiber constituting the paper sheet is scattered in the air and tends to adhere to the side surface and the bottom surface of the high-pressure water column flow treatment device. By spraying water from directly above the high-pressure water column treatment apparatus, the fibers are prevented from adhering to the apparatus, and once adhered fibers are washed off.

The apparatus for injecting water is not particularly limited as long as it can prevent pulp fibers from adhering and can wash off the adhering pulp fibers. For example, as shown in FIG. 2, a spray device having a plurality of flat spray type nozzles arranged in rows in the width direction of the long laminate is preferable. The flat spray nozzle arranged in this way can spray or spray water uniformly in the width direction, and thus can prevent adhesion of fibers and wash off with a minimum amount of water. In addition to a flat spray nozzle, a device that overflows water from a tray in a curtain shape is conceivable, but in this case, a large amount of water is required to make uniform water flow. For this reason, a water pool is formed on the laminate sheet, and a high-pressure water column flow acts on the water pool, so that energy loss occurs, and a wiping cloth in which pulp fibers and long fibers are sufficiently entangled cannot be obtained.

In other words, it is essential to spray or spray water on a region extending in the width direction covering the high-pressure water column flow treatment device, and it is desirable that the spray region be as narrow as possible. This is because not only the prevention of adhesion of the scattered fibers can be achieved with a minimum amount of water, but also the effect of entanglement of the fibers by the high-pressure water column flow is not hindered. A spray composed of a plurality of flat spray nozzles arranged in rows in the width direction of the long laminate as described above, and arranged such that the elongated spray areas of the individual spray nozzles coincide with the width direction. With the device, a uniform spray effect can be obtained with a minimum amount of water.

In the case of the flat spray nozzle used in the present invention, the angle at which water is sprayed (spray angle) is preferably 50 to 130 degrees. In particular, those having an angle of 80 to 110 degrees are most preferable. If the spray angle is less than 50 degrees, a problem arises in that a large number of spray nozzles must be installed for a single high-pressure water column.
Conversely, if the spray angle exceeds 130 degrees, it becomes difficult to spray water uniformly. The flow rate of spraying water is preferably 0.3 to 4 liters / min per nozzle. When the flow rate is less than 0.3 liter / min, the flow rate is too small to be able to jet water uniformly, and there is a portion which is not jetted to the high pressure water column flow treatment device, and the pulp fiber which is scattered by applying the high pressure water column flow There is a problem that the particles adhere. Conversely, if the flow rate exceeds 4 liters / min, excess water will fall on the laminate sheet and some of the energy of the high pressure water column flow will be used to repel this water when applying the high pressure water column flow. Therefore, sufficient kinetic energy cannot be given to the pulp fiber, and as a result, the pulp fiber and the long fiber are hardly entangled. In addition, as shown in FIG. 1, it is important to adjust the height and the number of spray nozzles so that water is sprayed evenly above the high-pressure water column.

The wiping cloth obtained as described above is one in which pulp fibers and long fibers are uniformly entangled and integrated.
It has a uniform formation without white spots. Then, the wiper can be provided with a lubricant such as water or propylene glycol, an antibacterial agent such as alcohols or benzoic acid ester, a fungicide, an agent such as a fragrance, and the like, if desired. Used as hand towel, wet tissue, wiper, disposable rag, etc.

[0022]

EXAMPLES Example 1 A long-fiber nonwoven fabric having a large number of point-fused portions in which polypropylene long fibers were integrated and self-fused with the polypropylene long fibers was prepared. The fineness of the long fibers constituting the long-fiber nonwoven fabric was 2.5 denier, and the basis weight of the long-fiber nonwoven fabric was 15 g / m ² . A paper sheet obtained by wet papermaking using bleached softwood kraft pulp was laminated on one surface of the long-fiber nonwoven fabric. This paper sheet had a basis weight of 40 g / m ² measured by the method shown in JIS P 8124. Next, the paper sheet was placed on a transfer conveyor formed of a wire mesh such that the paper sheet was positioned above and the long-fiber nonwoven fabric was positioned below. Next, while transferring this long sheet-like laminate at a speed of 25 m / min, 50 kg of the high-pressure water column flow treatment device in which nozzle holes having a hole diameter of 0.15 mm are linearly arranged at 1 mm intervals was used.
A high-pressure water column flow was ejected at a water pressure of / cm ² to apply a high-pressure water column flow to the surface of the paper sheet.

Further, a plurality of flat spray nozzles having a spray angle of 90 degrees are arranged in a row directly above the high-pressure water column flow treatment apparatus so that water is sprayed uniformly without overlapping individual spray areas in the width direction. Spray device. The position of the spray nozzle is 1 from the top of the high pressure water column flow treatment device
The position was 0 cm higher. Spraying was performed from such a spray device at a water rate of 1 liter / min per flat spray nozzle. As described above, the pulp fibers constituting the paper sheet and the long fibers constituting the long-fiber nonwoven fabric were entangled to obtain a composite sheet in which both were integrated.

Example 2 A composite sheet was obtained in the same manner as in Example 1 except that a flat spray nozzle having a spray angle of 60 ° was used instead of the flat spray nozzle having a spray angle of 90 °.

Example 3 A composite sheet was obtained in the same manner as in Example 1 except that the spray nozzles were installed so that the spray areas of water sprayed from adjacent spray nozzles overlapped by １ ／ in the width direction.

Comparative Example 1 A composite sheet was obtained in the same manner as in Example 1 except that an air jet nozzle was used instead of the water jet spray nozzle.

Comparative Example 2 A composite sheet was obtained in the same manner as in Example 1 except that an apparatus for allowing water to overflow from a saucer onto a curtain was used instead of the water spray nozzle. At this time, the amount of water overflowed from the tray was 60 l / min.

The quality of the wipes according to Examples 1 to 3 and Comparative Examples 1 and 2 was evaluated. Table 1 shows the results.

[Table 1]

The evaluation methods for the appearance, texture, adhesive strength and the like in Table 1 are as follows. (1) Appearance (form): The appearance (form) of the sample was evaluated by visual evaluation using 20 monitors, and evaluated on a five-point scale shown in Table 2, and an average value was obtained. (2) Texture: Softness was determined by a tactile test by 20 monitors. In the test method, the tactile sensation obtained by grasping the sample with a finger was checked, and the evaluation was performed in five steps shown in Table 2, and an average value was obtained. (3) Adhesion strength: Adhesion strength was determined by a sensory test by 20 monitors. In the test, the sample was picked up with tweezers from the paper sheet side, and each was evaluated in five steps shown in Table 2,
The average was determined.

[0030]

[Table 2]

As is clear from the above results, Example 1
The wipes obtained in Nos. 1 to 3 are superior in appearance, feeling, and adhesive strength to the wipes obtained in Comparative Examples 1 and 2. In Comparative Example 1, the pulp fibers adhered to the side and bottom surfaces of the high-pressure water column device by applying the high-pressure water column flow, and the pulp fiber mass dropped, resulting in white spots and poor formation. Was. In Comparative Example 2, water was too large to form a puddle on the laminated sheet during the production of the wiping cloth, and a high-pressure water column flow acted on the puddle, resulting in energy loss and a long pulp fiber. A wipe with sufficiently entangled fibers could not be obtained.

[0032]

As described above, according to the present invention, when a paper sheet made of pulp fiber is laminated on the surface of a long fiber web and a high-pressure water column flow is applied on the laminate, The pulp fibers constituting the paper sheet are prevented from being scattered by the pressure of the high-pressure water column flow and attached to the side surface or the bottom surface of the high-pressure water column treatment device, or the attached fibers can be washed away. Thus, it is possible to prevent the pulp fiber mass that has adhered to and accumulated on the high-pressure water column flow treatment device from dropping on the laminated sheet to form white spots, thereby preventing the formation of the obtained wiping cloth from being deteriorated. Furthermore, only a minimum amount of water needs to be injected from the water injection nozzle, and since water does not accumulate on the sheet-like laminate, energy loss of the high-pressure water column flow is small. Therefore,
The pulp fiber constituting the paper sheet is sufficiently isolated and uniformly entangled with the long fiber, and a wiping cloth excellent in uniform formation and adhesion without white spots can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing an example of an apparatus for manufacturing a wiping cloth according to the present invention.

FIG. 2 is a diagram schematically showing an ejection area of a fluid ejected by a flat spray nozzle.

[Explanation of symbols]

 Reference Signs List 1 flat spray nozzle 2 high-pressure water column flow treatment device 3 sheet-like laminate 4 perforated conveyor for transferring sheet-like laminate 5 fluid spray area by flat spray nozzle

──────────────────────────────────────────────────の Continued on front page (51) Int.Cl. ⁶ Identification code FI // D21H 27/30 D21H 1/02 A

Claims (1)

(57) [Scope of request for utility model registration] 1. A conveyor for transferring a long sheet-like laminate obtained by laminating a paper sheet made of a large number of pulp fibers on one side of a long fiber web in which hydrophobic and thermoplastic long weaves are accumulated; A device for applying a high-pressure water column to the paper sheet side of the long sheet-like laminate being conveyed by a conveyor, and a device for applying a high-pressure water column. An apparatus for manufacturing a wiping cloth, comprising a water spray device comprising a plurality of flat spray nozzles arranged in rows in the width direction of an object.