JP2019206770A - Apparatus for manufacturing nonwoven fabric - Google Patents

Abstract

To propose an apparatus for manufacturing a nonwoven fabric capable of surly producing in good production efficiency a nonwoven fabric having a chiseled appearance using a laminated web obtained by laminating a pulp fiber web on a synthetic fiber web.SOLUTION: The apparatus 1 for manufacturing a nonwoven fabric by forming a laminated web PWeb obtained by laminating a pulp fiber web PFW on a synthetic fiber web SW, and subjecting to water stream interlacing treatment of jetting water jet WJ from the upside of the laminated web is provided with a water stream interlacing device 5 for subjecting to water stream interlacing treatment, where the water stream interlacing device 5 has a plurality of water jet heads 51 arranged with intervals in a conveying direction TD of the laminated web, and is provided with a cleaning device 60 for cleaning a fouling AT attached to the water jet heads 51 caused by the water jet WJ jetted from the water jet heads 51.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an apparatus for producing a nonwoven fabric, which is obtained by hydroentangling a pulp fiber web made of pulp fibers and a synthetic fiber web made of synthetic fibers and is suitable as a wiper.

  Spunlace-type non-woven fabrics containing pulp fiber webs and synthetic fiber webs are non-woven fabrics that have both liquid absorbency and strength. As widely used in various applications.

  For example, as disclosed in Patent Document 1, the spunlace-type non-woven fabric as described above is subjected to hydroentanglement treatment by spraying a high-pressure water jet (water stream) after overlapping a pulp fiber web and a synthetic fiber web. Can be obtained by bonding the fibers. The composite nonwoven fabric formed by pulp fiber web and synthetic fiber web has both the advantages of pulp fiber web with good absorbability for both aqueous and oily liquids and synthetic fiber web with excellent strength It is offered to consumers as an excellent nonwoven fabric.

Japanese Patent No. 2533260

  In the case of the apparatus disclosed in FIG. 1 of Patent Document 1, a manifold for hydroentanglement in a state (laminated web) in which a pulp fiber layer 18 (pulp fiber web) is laminated on a nonwoven fabric support 20 (synthetic fiber web). The water is entangled with a fluid jet (water jet). By this treatment, the fibers of the pulp fiber web are entangled with the fibers of the synthetic fiber web, so that an integral nonwoven fabric can be formed.

However, in the hydraulic entanglement manifold 34, a high-pressure water jet is ejected onto the laminated web from, for example, a water jet head at a height of 10 mm to 30 mm from the web surface. Since the high-pressure water jet collides with the web in this way, a part of the jetted water bounces back and splashes around.
The upper side of the laminated web is a pulp fiber web, and short pulp fibers that do not contribute to entanglement are present in the pulp fiber web. In some cases, the short pulp fibers are scattered around the water droplets included in the water droplets constituting the rebound water and reach the outer peripheral portion of the water jet head in some cases. If this gradually accumulates, it will become the deposit | attachment which became the lump of the pulp. In addition, different types of deposits may adhere to the water jet head for other reasons.
When such deposits are subjected to hydroentanglement and fall onto a web that becomes a non-woven fabric, the appearance of the portion changes, so that the non-woven fabric that becomes the product becomes a defective product.

  Therefore, an object of the present invention is to propose a non-woven fabric production apparatus capable of producing a non-woven fabric having a uniform appearance with high production efficiency by using a laminated web in which a pulp fiber web is laminated on a synthetic fiber web.

  The above object is a non-woven fabric manufacturing apparatus that is manufactured by forming a laminated web in which a pulp fiber web is laminated on a synthetic fiber web and performing a hydroentanglement process in which a water jet is jetted from the upper side of the laminated web. A water entanglement device for performing the water entanglement process, wherein the water entanglement device has a plurality of water jet heads arranged at intervals in the conveying direction of the laminated web; This can be achieved by a non-woven fabric manufacturing apparatus characterized in that a cleaning device is provided for cleaning deposits adhering to the water jet head based on the water jet ejected from the water jet.

  The water jet head extends in the width direction of the laminated web perpendicular to the transport direction, and jets the water jet toward the laminated web for the hydroentanglement process of the laminated web. The cleaning device may include a cleaning shower nozzle that injects a cleaning water shower toward the deposit.

Further, the cleaning shower nozzle of the cleaning device may be disposed at a fixed position.
Moreover, the said cleaning shower nozzle of the said washing | cleaning apparatus is good also as what is arrange | positioned so that a reciprocation is possible in the said width direction.

  The amount of water in the washing water shower sprayed from the washing shower nozzle is preferably 10 to 100 L / min · m.

  And when the water jet collides with the laminated web, the adhering matter is formed by bounce water containing short pulp fibers reaching the water jet head and depositing the short pulp fibers. Can be included.

  ADVANTAGE OF THE INVENTION According to this invention, the nonwoven fabric manufacturing apparatus which can manufacture efficiently the nonwoven fabric with the external appearance using the laminated web which laminated | stacked the pulp fiber web on the synthetic fiber web can be provided.

It is the figure shown about the nonwoven fabric manufacturing apparatus which concerns on this invention. It is the figure which shows about the washing | cleaning apparatus with which the hydroentanglement apparatus of the nonwoven fabric manufacturing apparatus which concerns on this invention is provided.

Hereinafter, the nonwoven fabric manufacturing apparatus which concerns on one Embodiment of this invention is demonstrated with reference to figures.
First, a schematic configuration of the nonwoven fabric manufacturing apparatus 1 will be described. The nonwoven fabric manufacturing apparatus 1 shown in FIG. 1 is provided with an airlaid device 2, a spunbond web supply device 3 for supplying a spunbond web as a synthetic fiber web, and a suction device 4 on the upstream side. The suction device 4 is arranged to face the lower side of the air laid device 2.
In the web transport direction TD, downstream from these devices 2, 3, 4, there are a hydroentanglement device 5, a suction device 6, and a drying device 7 that inject water jets for performing hydroentanglement processing in order from the upstream side. Has been placed. A winding device 8 for winding the continuously produced nonwoven fabric WP is further provided downstream of the drying device 7.

  The air laid apparatus 2 supplies the fiber pulp PF which has been defibrated with a defibrating machine 21 for defibrating the raw pulp RP, in which fibers are densely packed into a sheet shape, into pulp fibers, or a blower not shown, to the air laid hopper 23. And a duct 22 for conveying.

An air-laid hopper 23 is disposed downstream of the duct 22. Inside the air-laid hopper 23, the pulp fibers in the defibrated state descend while being dispersed, and a piled pulp fiber web PFW is gradually formed at the stacking position 24 set on the lower surface.
A suction device 4 is disposed opposite to the lower side of the stacking position 24. More specifically, the suction device 4 has a suction portion 42 on the upper surface of the device main body 41, and the suction portion 42 is placed against the stacking position 24 so as to apply a suction force (negative pressure) to the pulp fiber web PFW. It is set.
FIG. 1 illustrates a case where the pulp fiber web PFW is formed by arranging the air laid hopper 23 and the suction device main body 41 one by one. However, the present invention is not limited to this, and the airlaid hopper 23 and the suction device main body 41 may be changed to an arrangement having two or more stages depending on the basis weight (basis weight) of the pulp fiber web PFW and the production speed.

Further, a transport wire 43 for transporting the web is disposed around the suction device 4. The transport wire 43 can be placed with the pulp fiber web PFW on which the pulp fibers PF are deposited at the stacking position 24, and is disposed so as to transport this downstream. However, the pulp fiber web PFW is not placed directly on the transport wire 43. This will become clear from the following description.
The carrier wire 43 is formed in an open mesh form (mesh) so that the suction force of the suction part 42 extends to the opposite side (upper side).

  A spunbond web supply device 3 is disposed below the air laid device 2 and upstream of the suction device 4. In the spunbond web supply device 3, a spunbond web SW prepared in advance is set in a roll shape. The spunbond web SW is pulled out from the spunbond web supply device 3 and is transported to the stacking position 24 on the transport wire 43 described above. As the spunbond web SW, a continuous filament web of synthetic resin formed by a spunbond method is preferably used.

  The above-described pulp fiber web PFW is placed on the spunbond web SW located at the laminating position 24. At that time, the suction force by the suction portion 42 of the suction device 4 passes through the transport wire 43 at the stacking position 24 and acts on the spunbond web SW and the pulp fiber web PFW thereon. Therefore, the preliminary laminated body PWeb (laminated web) in which the spunbond web SW and the pulp fiber web PFW are laminated is conveyed downstream.

The above-described preliminary laminated body PWeb is maintained in a laminated state by being sucked and compressed by the suction force of the suction device 4. At this time, the fibers of the upper pulp fiber web PFW are in a dense state. However, if the preliminary laminate PWeb is conveyed into the downstream water entangling device 5 as it is, a part of the pulp fiber PF may be swollen by the water jet (high-pressure water flow).
Therefore, in the present manufacturing apparatus 1, the preliminary laminated body PWeb is sandwiched from above and below, the sandwiching roller 28 for stabilizing the placement state of the pulp fiber web PFW on the spunbond web SW, and the upstream of the hydroentanglement device 5. A prewetting device 30 is provided on the side to provide moisture for preventing fiber scattering. The prewetting device 30 preferably applies a suction force from the spray nozzle 31 that sprays the water mist from above the preliminary laminate PWeb and the lower side of the preliminary laminate PWeb (that is, the lower surface of the pulp fiber web PFW). And a suction device 32.
In addition, in FIG. 1, although the case where the prewetting apparatus 30 is provided as a new apparatus in front of the hydroentanglement apparatus 5 as mentioned above is illustrated, it does not restrict to this. For a plurality of sets including a water jet head 51 and a suction device 52, which will be described later, included in the hydroentanglement device 5, a design change may be made so that the set positioned at the head is used as the prewetting device 30. In this case, adjustment may be made so that low-pressure water mist is sprayed from the head water jet head 51.
In the case of the hydroentanglement device 5 in which the number of sets of the water jet head 51 and the suction device 52 sufficient to perform the hydroentanglement process is secured, the leading water jet head 51 and the suction device 52 are pre-installed as described above. Utilizing it as a wet device is effective in reducing the cost of equipment.

The hydroentanglement device 5 promotes the entanglement of the pulp fibers by blowing a high-pressure water jet to the preliminary laminate PWeb that has been subjected to the processing of the sandwiching roller 28 and the prewetting device 30 serving as a pretreatment unit. Thereby, integration of the pulp fiber web PFW layer located on the upper side and the spunbond web SW layer located on the lower side is promoted (hydroentanglement process).
In the water entangling device 5 illustrated in FIG. 1, water jet heads 51 are arranged in multiple stages (four stages illustrated in FIG. 1) along the transport direction TD.
In FIG. 1, the state of the nozzles provided in the water jet head 51 extending in the direction perpendicular to the transport direction TD (web width direction WD) is not shown, but a plurality of nozzles in the width direction are not shown. Water jet nozzles are arranged at appropriate positions.

  The water pressure at the time of the hydroentanglement treatment is desirably set in consideration of the basis weight of the pulp fiber web PFW and the spunbond web SW. For example, it is preferable to select in the range of 1 to 30 MPa.

A suction device 52 is disposed so as to face the water jet head 51. The suction force of the suction device 52 is applied to the lower side of the spunbond web SW located on the lower side while blowing the high-pressure water jet coming out of the water jet head 51 onto the pulp fiber web PFW located on the upper side. Due to the cooperative action of the water jet head 51 and the suction device 52, the pulp fibers on the pulp fiber web PFW side have entered the lower spunbond web SW or have passed through the spunbond web SW to the opposite side. It is presumed that a state is formed. The action promotes the integration of the two layers.

The water entanglement device 5 is also provided with a transport wire 55. The transport wire 55 receives the preliminary laminate PWeb downstream of the pretreatment units 28 and 30 and transports it into the hydroentanglement device 5. The transport wire 55 is disposed so as to pass between the water jet head 51 and the suction device 52 of the water entangling device 5 from the upstream side toward the downstream side.
Therefore, the preliminary laminated body PWeb transported on the transport wire 55 is subjected to more hydroentanglement processing toward the downstream in the transport direction TD, and when the hydroentanglement device 5 exits, the upper pulp fiber Sufficient entangling between the web PFW layer and the lower spunbond web SW layer is achieved.
The non-woven fabric immediately after leaving the hydroentanglement device 5 is in a wet state, and the bonds such as pulp fibers are not sufficiently established.

Therefore, as shown in FIG. 1, a suction device 6 and a drying device for completing the production of the nonwoven fabric WP by sucking and removing moisture remaining on the web downstream of the hydroentanglement device 5 and then drying it. 7 is deployed. In this way, after the production of the nonwoven fabric WP, if the dehydration and drying are performed by the suction device 6 and the drying device 7, the nonwoven fabric can be produced efficiently, and the produced nonwoven fabric after hydroentanglement can be dried without applying a large external pressure. Since the manufactured nonwoven fabric can be manufactured, it can finish in a product with a bulky feeling.
The suction device 6 dehydrates the nonwoven fabric after hydroentanglement by, for example, a vacuum type. The drying device 7 is preferably an uncompressed dryer, preferably an air-through dryer. In FIG. 1, a rotatable dryer body 71 of an air-through dryer is a cylindrical body, and a large number of through holes are provided on the peripheral surface thereof. Hot air heated by a heat source (not shown) is centered from the outer periphery of the dryer body. It is good to make it the structure sucked toward the side.
The composite nonwoven fabric WP manufactured continuously in this manner is wound around the roller 81 of the winding device 8 to complete a series of steps.

  FIG. 2 is a view shown for explaining the cleaning device 60 provided in the above-described hydroentanglement device 5 of the nonwoven fabric manufacturing apparatus 1. FIG. 2A is a plan view schematically showing the inside of the hydroentanglement device 5 so that it can be easily confirmed, and FIG. 2B is a side view of the four water jet heads 51 of the hydroentanglement device 5. It is a side view shown corresponding to the position of 2 (a).

  Referring to FIG. 2 (b), the laminated web (preliminary laminated body PWeb) has been subjected to a predetermined pretreatment as described above, and the pulp fibers PF constituting the pulp fiber web PFW located on the upper side float up. Although not provided, since the high-pressure water jet WJ is ejected from the water jet head 51, the rebound water RB from the web PWeb is generated. The water droplets constituting the rebound water RB include, for example, short pulp fibers and may become the deposit AT that adheres to the water jet head 51 and cause the above-described problems.

  Therefore, the hydroentanglement device 5 is provided with a cleaning device 60 for cleaning the deposit AT. The cleaning device 60 includes a cleaning shower nozzle SN that injects a cleaning water shower WS toward the deposit AT. In FIG. 2A schematically showing the main part of the cleaning device 60, a pipe 61 for supplying water for cleaning water shower between a plurality of water jet heads 51 (four in the example). (61a, 61b) are arranged. A plurality of cleaning shower nozzles SN are provided at predetermined positions of the pipe 61.

The cleaning shower nozzle SN may be arranged at a fixed position, or may be arranged so as to be able to reciprocate in the width direction of the web.
FIG. 2 (a) exemplarily shows a case where the cleaning shower nozzle SN is provided as a fixed arrangement for the three upstream pipes 61a, and the two downstream pipes 61b are reciprocally slid in the width direction WD. The case where the cleaning shower nozzle SN is provided so as to be able to reciprocate in the width direction is shown.

When the cleaning shower nozzle SN is set to a fixed position, the cleaning water shower WS from each cleaning shower nozzle SN is ejected in a conical shape, for example. Here, as shown in the figure, it is preferable that the unfolded ends are set so as to overlap each other. More specifically, when the cleaning shower nozzle SN is set to a fixed position, the position of the cleaning shower nozzle SN is selected so that the cleaning water shower WS is sprayed onto the water jet head 51 without a gap. Further, at that time, it is preferable that the deployed end portions overlap with each other so that the water pressure and the amount of water of the washing water shower WS are reduced, and this point is compensated for.
On the other hand, when the cleaning shower nozzle SN reciprocates, the cleaning water shower WS may be set to overlap each other at the end of the reciprocating range. Therefore, as shown in the figure, when the configuration in which the cleaning shower nozzle SN is reciprocated is adopted, the number of the cleaning shower nozzles SN to be arranged can be reduced as compared with the case where the fixed position is set.

The cleaning shower nozzle SN is disposed between the water jet heads 51, so that the cleaning water shower WS can be sprayed toward the deposit AT to efficiently clean the deposit AT.
In addition, there is a strong tendency for deposits to occur in the water jet head 51 located on the upstream side. On the other hand, the water jet head 51 located on the downstream side generates relatively little deposits. Therefore, the cleaning shower nozzles SN may be arranged between all the water jet heads 51. However, as illustrated, the cleaning shower nozzles SN are not arranged for the last period, and the number of shower stages is not reduced. Good. That is, the cleaning shower nozzle SN may be arranged at least at a part between the plurality of water jet heads 51 in consideration of equipment cost and cleaning efficiency.

  The amount of water in the cleaning water shower WS to be sprayed from the cleaning shower nozzle SN is preferable to spray a large amount of cleaning water shower from the viewpoint of surely cleaning the deposits on the water jet head 51, but below that the product and Therefore, it is necessary to limit the amount of water so as not to disturb the appearance of the nonwoven fabric. For example, it is preferably 10 to 100 L / min · m. A more preferable amount of water in the washing water shower WS is 20 to 90 L / min · m. If the amount of water is less than the above range, a sufficient cleaning effect cannot be expected, and if the amount of water is more than the above range, the appearance of the produced nonwoven fabric may be deteriorated.

According to the nonwoven fabric manufacturing apparatus 1 described above, since the cleaning device for cleaning the deposits adhering to the water jet head is provided, the occurrence of deposits can be suppressed. Therefore, the nonwoven fabric of the stable external appearance can be manufactured.
If the fall of the deposits can be reliably suppressed, the nonwoven fabric manufacturing apparatus 1 can be operated at a high speed, and as a result, the production efficiency of the nonwoven fabric can be improved.
In the above-described embodiment according to FIG. 1, the case where the dry type using the dry airlaid is described when manufacturing the pulp fiber web is not limited thereto. Even if the pulp fiber web is manufactured by applying the wet papermaking sheet manufacturing method, the same effect as described above can be obtained.

  Although the description of the embodiment has been completed above, the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made without departing from the scope of the invention.

DESCRIPTION OF SYMBOLS 1 Nonwoven fabric manufacturing apparatus 2 Airlaid apparatus 3 Spunbond web supply apparatus 4 Suction apparatus 5 Hydroentanglement apparatus 6 Suction apparatus 7 Drying apparatus 8 Winding apparatus 21 Defibrator 22 Duct 23 Airlaid hopper 24 Lamination position 28 Nipping roller 30 Prewetting apparatus 31 Spray Nozzle 32 Suction device 41 Suction device main body 42 Suction part 43 Transport wire 51 Water jet head 52 Suction device 55 Transport wire 60 Cleaning device 61 Piping (61a: Cleaning shower nozzle SN is fixedly arranged, 61b: Cleaning shower nozzle SN in the width direction (Reciprocation possible)
SW Synthetic fiber web PF Pulp fiber PFW Pulp fiber web PWeb Preliminary laminate (Laminated web)
WP Non-woven fabric AT Deposit WJ Water jet WS Washing water shower SN Washing shower nozzle TD Transport direction WD Width direction RB Rebound water

Claims (6)

A nonwoven fabric manufacturing apparatus manufactured by forming a laminated web in which a pulp fiber web is laminated on a synthetic fiber web, and performing a hydroentanglement process in which a water jet is jetted from the upper side of the laminated web,
A hydroentanglement device for performing the hydroentanglement process,
The hydroentanglement device has a plurality of water jet heads arranged at intervals in the conveying direction of the laminated web, and the water jet head is based on the water jets ejected from the water jet heads. A non-woven fabric manufacturing apparatus, characterized in that a cleaning device for cleaning deposits adhering to the substrate is provided. The water jet head extends in the width direction of the laminated web perpendicular to the transport direction, and jets the water jet toward the laminated web for the hydroentanglement process of the laminated web. Is set to
The nonwoven fabric manufacturing apparatus according to claim 1, wherein the cleaning device includes a cleaning shower nozzle that injects a cleaning water shower toward the deposit.   The nonwoven fabric manufacturing apparatus according to claim 2, wherein the cleaning shower nozzle of the cleaning apparatus is disposed at a fixed position.   The nonwoven fabric manufacturing apparatus according to claim 2, wherein the cleaning shower nozzle of the cleaning device is disposed so as to be capable of reciprocating in the width direction.   5. The nonwoven fabric manufacturing apparatus according to claim 2, wherein an amount of water of the cleaning water shower sprayed from the cleaning shower nozzle is 10 to 100 L / min · m.   The deposit is formed by rebound water containing short pulp fibers reaching the water jet head and depositing the short pulp fibers when the water jet collides with the laminated web. The nonwoven fabric manufacturing apparatus in any one of Claim 1 to 5 containing a thing.

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