JP4596520B2 - Pulp crusher - Google Patents

Description

  The present invention relates to a pulp crusher for crushing pulp for an absorber.

2. Description of the Related Art Conventionally, a pulverizer for pulverizing sheet-like pulp has been used in the manufacture of an absorbent used for sanitary goods such as paper diapers. For example, in Patent Document 1, absorption is performed by laminating a sheet-shaped pulp wound around a drum by unwinding (pulverizing) with a defibrating machine (pulverizing device) and blowing the defibrated pulp onto a nonwoven fabric. A technique for forming a body liquid-absorbing layer is disclosed.
JP 2001-309945 A

  By the way, in such a pulverizing apparatus, when the end portion of the supplied pulp is pulverized, the pulp piece after passing through the feed roller is pulled by the pulverization blade and is not pulverized in the pulverization chamber provided with the pulverization blade. There is a risk of entering. Moreover, even if the pulp piece is not caught, the moving speed of the pulp is increased by the rotational force of the pulverizing blade, and the pulverized pulp becomes coarse as the amount of pulverized pulp generated per unit time increases from the specified amount. End up. Furthermore, since the preceding pulp end part and the following pulp are separated and no pulverized pulp is produced during that time, the amount and quality of the pulverized pulp produced per unit time vary, and the quality of the formed absorbent body The uniformity of the will deteriorate.

  For this reason, the work of stopping the apparatus before the end of the pulp ends and removing the end of the pulp from the feed roller is carried out, but the cause of the difficulty in improving the yield while reducing the efficiency of the grinding operation It has become. Although two pulp supply mechanisms are provided and operated alternately to prevent a reduction in efficiency of the pulverization work, the apparatus becomes large.

  Until a coarsely pulverized pulp becomes a predetermined size or less by providing a screen in which many fine openings are formed at the discharge port of the pulverized pulp from the pulverization chamber and providing another pulverization mechanism in the pulverization chamber. In some cases, re-pulverization is repeated in the pulverization chamber, or two pulverization devices of coarse pulverization and fine pulverization are used in parallel so that the production of pulverized pulp is not completely interrupted. However, even in these methods, the amount of pulverized pulp produced per unit time is not maintained constant, and the pulverized pulp needs to be measured before the absorber is formed.

  The present invention has been made in view of the above problems, and maintains a constant pulp entry speed with respect to a pulverization cylinder at the time of pulverization near the end of the pulp, and the amount and quality of pulverized pulp produced per unit time are uniform. It aims to improve.

The invention according to claim 1 is a pulp crusher for crushing pulp for an absorber, wherein a pulp supply mechanism that supplies sheet-like pulp at a constant speed in a predetermined supply direction, and the pulp supply mechanism Downstream, a grinding cylinder that crushes the pulp entering the outer peripheral surface by rotating at a predetermined rotation speed around a rotation axis parallel to the pulp, and rotation of the outer peripheral surface for pulp entering the outer peripheral surface. A substantially plate-shaped support portion that supports the pulp, and a passage time acquisition means for acquiring a time when the end of the pulp passes through the pulp supply mechanism and the restraint of the pulp by the pulp supply mechanism is released, and the pulp The rotation speed of the pulverizing cylinder is decreased until the next pulp enters the outer peripheral surface of the pulverizing cylinder after the end of has passed through the pulp supply mechanism. And the pulverization of the end portion of the pulp at a slower speed than the case where the end portion of the pulp in a state where the restriction by the pulp supply mechanism is released is drawn into the crushing cylinder rotating at the predetermined rotation speed. And an approach speed control means comprising a control circuit for entering the cylinder.

The invention according to claim 2 is a pulp crusher for crushing pulp for an absorber, wherein a pulp supply mechanism that supplies sheet-like pulp at a constant speed in a predetermined supply direction, and the pulp supply mechanism Downstream, a grinding cylinder that crushes the pulp entering the outer peripheral surface by rotating at a predetermined rotation speed around a rotation axis parallel to the pulp, and rotation of the outer peripheral surface for pulp entering the outer peripheral surface. A substantially plate-shaped support portion that supports the pulp, and a passage time acquisition means for acquiring a time when the end of the pulp passes through the pulp supply mechanism and the restraint of the pulp by the pulp supply mechanism is released, and the pulp After the end of the pulp passes through the pulp supply mechanism, resistance is given to the movement of the end of the pulp until the next pulp enters the outer peripheral surface of the grinding cylinder. And the pulverization of the end portion of the pulp at a slower speed than the case where the end portion of the pulp in a state where the restriction by the pulp supply mechanism is released is drawn into the crushing cylinder rotating at the predetermined rotation speed. And an approach speed control mechanism for entering the cylinder.

According to a third aspect of the invention, a pulp grinder according to claim 2, wherein the mechanism, the resistance the terminal portion of the pulp with the movement of the end portion of the pulp was pressed to the support section Provided with a pressing mechanism.

The invention described in claim 4 is the pulp disintegrator device according to any one of claims 1 to 3, wherein the end portion of the pulp after passing through the pre-Symbol pulp feed mechanism to enter the grinding cylinder The difference between the feeding speed and the pulp feeding speed by the pulp feeding mechanism is 10% or less of the feeding speed.

Invention of Claim 5 is the pulp crushing apparatus in any one of Claim 1 thru | or 4 , Comprising: The said grinding | pulverization cylinder is provided with the some grinding | pulverization blade arranged along the said rotating shaft,
Each of the plurality of crushing blades has a substantially disc shape perpendicular to the rotation axis, and has a plurality of teeth at a constant pitch on the outer periphery, and a plurality of the plurality of crushing blades are provided on the outer peripheral surface of the crushing cylinder Teeth are arranged in a spiral.

In the present invention, at the time of pulverization in the vicinity of the terminal end of the pulp, the speed of the pulp entering the pulverization cylinder can be maintained constant, and the amount of pulverized pulp produced per unit time and the uniformity of quality can be improved. In the invention of claim 1 , the pulp entry speed in the vicinity of the end of the pulp can be easily maintained constant.

In the invention of claim 2 , it is possible to maintain a constant pulp entry speed in the vicinity of the end of the pulp while keeping the rotation speed of the grinding cylinder constant, and to greatly suppress fluctuations in the quality of the pulverized pulp. it can. In the invention of claim 3 , the pulp entry speed in the vicinity of the end of the pulp can be kept constant with a simple configuration.

According to the invention of claim 5 , the quality of the pulverized pulp can be improved by reducing the maximum value of the force applied to the pulp by the rotation of the pulverizing cylinder, and the maintenance of the approach speed of the pulp in the vicinity of the end of the pulp. As a result, high-quality ground pulp can be produced.

  FIG. 1 is a diagram showing a configuration of an absorbent body manufacturing apparatus 1 according to the first embodiment of the present invention. The absorbent body manufacturing apparatus 1 is an apparatus for manufacturing an absorbent body 90 used for a paper diaper, a sanitary napkin, and the like, and the absorbent body 90 is obtained by pulverizing a thin pulp 9 cut to a certain size. Manufactured using ground pulp.

  The absorbent body manufacturing apparatus 1 includes a pulp supply mechanism 2 that supplies pulp 9 at a constant speed in the (−X) direction in FIG. 1 along a predetermined supply path, and a pulp supply mechanism 2 on the downstream side of the pulp supply mechanism 2. The pulp pulverizing mechanism 3 for pulverizing the pulp 9 for the absorber supplied by the pulverizer, the absorbent body forming mechanism 4 for forming the absorbent body 90 by molding the pulverized pulp generated by the pulp pulverizing mechanism 3, and these mechanisms The control part 5 to control is provided.

  The pulp supply mechanism 2 includes a pulp placement unit 21 on which a plurality of stacked pulps 9 are placed, a pulp take-out mechanism 22 that takes out the pulp 9 one by one from the pulp placement unit 21, and a pulp 9 from the pulp take-out mechanism 22. A conveyor 23 that receives and conveys it in the (−X) direction, and a supply path 24 that is disposed on the (−X) side of the conveyor 23 and guides the pulp 9 to the pulp crushing mechanism 3.

  2 and 3 are an enlarged front view and a plan view showing the vicinity of the supply path 24 and the pulp crushing mechanism 3. For convenience of illustration, FIG. 3 illustrates the pulp crushing mechanism 3 so that the internal structure can be understood. As shown in FIG. 2, the supply path 24 includes a substantially plate-like upper plate 241 and lower plate 242 that are in contact with the main surfaces of the pulp 9 on the (+ Z) side and the (−Z) side. The pulp supply mechanism 2 includes a first upper roller 243 disposed on the (+ X) side of the pulp crushing mechanism 3 and a first lower roller disposed opposite the first upper roller 243 across the pulp 9. 244, a second upper roller 245 disposed on the (+ X) side of the first upper roller 243, and a second lower roller 246 disposed opposite to the second upper roller 245 across the pulp 9 Prepare.

  The first upper roller 243 and the second upper roller 245 are in contact with the main surface on the (+ Z) side of the pulp 9 through the opening 2410 (see FIG. 3) provided in the upper plate 241, and the first lower roller 244 and The second lower roller 246 is in contact with the (−Z) main surface of the pulp 9 through an opening provided in the lower plate 242. The first upper roller 243 and the second upper roller 245 are pressed toward the lower roller by the pressing mechanism.

  As shown in FIG. 3, in the pulp supply mechanism 2, the first upper roller 243 and the second upper roller 245 are rotated clockwise in FIG. 2 by the motor 247 via the timing belts 2482 and 2482. The first lower roller 244 and the second lower roller 246 are connected to the first upper roller 243 and the second upper roller 245 via gears 2491 and 2492, and the first upper roller 243 and the second upper roller 245 are connected. 2 rotates counterclockwise in FIG. 2, and the pulp 9 is smoothly supplied to the pulp crushing mechanism 3 while being guided by the upper plate 241 and the lower plate 242. The first lower roller 244 and the second lower roller 246 may be passively rotated as the pulp 9 moves.

  As shown in FIGS. 2 and 3, the end of the pulp 9 is located on the (−Y) side of the first upper roller 243 and the first lower roller 244, and the pulp supply mechanism 2 (that is, the first upper roller 243 and the first upper roller 243 A pulp passage sensor 61 is provided for acquiring a time point when the restriction of the pulp 9 by the pulp supply mechanism 2 is released after passing through the lower roller 244). The pulp passage sensor 61 includes a light source 611 such as a light emitting diode disposed on the (+ Z) side of the upper plate 241 and a light receiving element 612 such as a photodiode disposed on the (−Z) side of the lower plate 242 (FIG. 2). See). The light source 611 and the light receiving element 612 are arranged to face each other with the supply path 24 interposed therebetween. When the pulp 9 does not exist between the light source 611 and the light receiving element 612, the light continuously emitted from the light source 611 Is received by the light receiving element 612 through the openings provided in the upper plate 241 and the lower plate 242. The output from the light receiving element 612 is sent to the control unit 5 (see FIG. 1), and the control unit 5 continuously confirms the presence or absence of the pulp 9 at the position of the pulp passage sensor 61.

  In the absorbent body manufacturing apparatus 1, the operation of the pulp crushing mechanism 3 is controlled based on the output from the light receiving element 612 by the crushing mechanism control unit 51 (see FIG. 1) of the control unit 5 (details of the control will be described later). .)

  The pulp crushing mechanism 3 includes a crushing cylinder 31 that crushes the pulp 9 and a motor (not shown) connected to a pulley 312 via a timing belt. The crushing cylinder 31 is parallel to the pulp 9 and supplies pulp. It has a substantially cylindrical shape centered on a cylinder rotation shaft 311 that is substantially perpendicular to the supply direction of the mechanism 2 (that is, facing the Y direction in FIG. 2). The crushing cylinder 31 includes 30 crushing blades 32 arranged along the cylinder rotation shaft 311, and each crushing blade 32 has a substantially disc shape perpendicular to the cylinder rotation shaft 311 with the cylinder rotation shaft 311 as a center. ing. Each crushing blade 32 includes a plurality of (in this embodiment, 12) teeth 321 at a constant pitch on the outer periphery.

  FIG. 4 is an enlarged front view showing the vicinity of the outer peripheral surface of the crushing cylinder 31. As shown in FIG. 4, each grinding blade 32 has its teeth 321 shifted by 1 ° from the grinding blade 32 adjacent to the (−Y) side in the rotational direction of the grinding cylinder 31 (that is, clockwise in FIG. 4). As shown in FIG. 3, the tips of the plurality of teeth 321 are arranged in a spiral shape around the cylinder rotation shaft 311 on the outer peripheral surface of the crushing cylinder 31. In the pulp crushing mechanism 3, the motor for the crushing cylinder 31 is driven by the control unit 5 (see FIG. 1) so that the crushing cylinder 31 has a predetermined rotation speed (hereinafter referred to as “normal rotation speed”) around the cylinder rotation shaft 311. 2), the pulp 9 that rotates clockwise in FIG. 2 and enters the outer peripheral surface of the crushing cylinder 31 is crushed.

  In the absorbent body manufacturing apparatus 1, the leading edges of the upper plate 241 and the lower plate 242 are close to the outer peripheral surface of the crushing cylinder 31 as shown in FIGS. 2 and 3. As a result, the tip of the lower plate 242 moves the pulp 9 entering the grinding cylinder 31 against the rotation of the outer peripheral surface of the grinding cylinder 31 when the grinding cylinder 31 rotates and contacts from the (+ Z) side of the pulp 9. Therefore, the pulp 9 is more reliably pulverized. The tip of the upper plate 241 serves as a guide that abuts the pulp 9 from the (+ Z) side while facing the tip of the lower plate 242.

  By the way, the pulverization of the pulp 9 progresses, and the terminal end of the pulp 9 (that is, the end portion on the (+ X) side) passes through the first upper roller 243 and the first lower roller 244, and the restraint by the pulp supply mechanism 2 is released. The pulp 9 is normally supplied at a speed higher than the supply speed by the pulp supply mechanism 2 by the force applied to the pulp 9 by the rotation of the grinding cylinder 31 (that is, the force pulling the pulp 9 in the (−X) direction). It moves naturally in the direction and enters the crushing cylinder 31. Hereinafter, the movement speed of the pulp 9 when it is drawn into the pulverization cylinder 31 that rotates at the normal rotation speed in a state where the restriction by the pulp supply mechanism 2 is released is referred to as “unrestricted drawing speed”.

  In the absorbent body manufacturing apparatus 1, when the pulp 9 is pulverized near the terminal end, the operation of the pulp pulverizing mechanism 3 is controlled by the pulverizing mechanism control unit 51 of the control unit 5 shown in FIG. Increase in speed is suppressed. FIG. 5 is a diagram showing a control flow of the pulp crushing mechanism 3 every time each pulp 9 is crushed. In the absorbent body manufacturing apparatus 1, when the end of the pulp 9 passes through the pulp passage sensor 61, light from the light source 611 enters the light receiving element 612, and an output from the light receiving element 612 is sent to the pulverization mechanism control unit 51. 9 is detected (step S11). In order to detect the passage of the end of the pulp 9 with certainty, the conveyance of the next pulp 9 is controlled so that a slight gap is formed between the next pulp 9.

  In the crushing mechanism control unit 51, a predetermined time from the detection of the passage of the rear end of the pulp 9 (the distance in the X direction between the pulp passage sensor 61 and the center of the first upper roller 243, and the pulp 9 by the pulp supply mechanism 2). ) Is determined to have passed through the pulp supply mechanism 2 (that is, the first upper roller 243 and the first lower roller 244), and the motor for the grinding cylinder 31 is Control is performed to reduce the rotational speed of the crushing cylinder 31 (step S12). As described above, the end portion of the pulp 9 after passing through the pulp supply mechanism 2 is drawn into the rotation of the crushing cylinder 31 and moves naturally in the supply direction. At this time, the crushing cylinder 31 is rotated at the normal rotation speed. Since it rotates at a slower predetermined speed (hereinafter referred to as “deceleration rotation speed”), it enters the crushing cylinder 31 at a speed slower than the unconstrained pull-in speed (hereinafter referred to as “end portion entry speed”).

  In the crushing mechanism control unit 51, the rotational speed at the time of deceleration of the crushing cylinder 31 is set so that the end portion entry speed of the pulp 9 becomes substantially equal to the supply speed by the pulp supply mechanism 2. In this way, by reducing the speed at which the pulp 9 is drawn in the supply direction by the rotation of the grinding cylinder 31, the approach speed of the pulp 9 to the grinding cylinder 31 (that is, the pulp 9 Supply rate) can be easily maintained constant, and as a result, the amount of ground pulp produced per unit time and the uniformity of quality can be improved. From the viewpoint of improving the amount of pulverized pulp produced and the uniformity of the quality, the difference between the end entry speed of the pulp 9 and the supply speed of the pulp 9 by the pulp supply mechanism 2 is 10% or less of the supply speed by the pulp supply mechanism 2 It is preferable that

  In the pulp crushing mechanism 3, the pulp 9 is sequentially crushed by the plurality of teeth 321 arranged in a spiral shape on the outer peripheral surface of the crushing cylinder 31, so that it is added to the pulp 9 at the time of crushing by the rotation of the crushing cylinder 31. The maximum value of the force can be reduced to improve the quality of the pulverized pulp, and a high quality pulverized pulp can be produced in combination with the maintenance of the supply rate of the pulp 9 in the vicinity of the end of the pulp 9.

  In the pulp supply mechanism 2, the upper plate 241 and the lower plate 242 that are in contact with the pulp 9 from the (+ Z) side and the (−Z) side are provided close to the outer peripheral surface of the pulverizing cylinder 31. Even when the part is pulverized, the pulp 9 separated from the first upper roller 243 and the first lower roller 244 can be prevented from being drawn into the pulp crushing mechanism 3 without being bent and crushed. Can be reliably crushed to the end. As a result, the yield of pulverized pulp is also improved.

  In the absorbent body manufacturing apparatus 1, while the terminal portion of the preceding pulp 9 that has passed through the pulp supply mechanism 2 is being crushed, the next pulp 9 passes through the supply path 24 by the second upper roller 245 and the second lower roller 246. Move in the supply direction. When the front end of the succeeding pulp 9 passes through the pulp passage sensor 61, the light incident on the light receiving element 612 from the light source 611 is blocked by the pulp 9, and the output from the light receiving element 612 is sent to the crushing mechanism control unit 51 to follow. The passage of the front end of the pulp 9 is detected (step S13).

  In the pulverization mechanism control unit 51, a predetermined time (the distance in the X direction between the pulp passage sensor 61 and the tip of the lower plate 242 and the pulp supply mechanism) from the passage detection of the front end of the succeeding pulp 9 by the pulp passage sensor 61. 2), the pulverization of the terminal portion of the preceding pulp 9 is completed, and it is determined that the subsequent pulp 9 has entered the outer peripheral surface of the pulverizing cylinder 31. The motor for the cylinder 31 is controlled to increase the rotation speed of the crushing cylinder 31 to the normal rotation speed (step S14).

  As described above, in the absorbent body manufacturing apparatus 1, the next pulp 9 enters the outer peripheral surface of the crushing cylinder 31 after one pulp 9 passes through the pulp supply mechanism 2 with respect to the sequentially supplied pulp 9. In the meantime, the crushing mechanism control unit 51 performs control to reduce the rotation speed of the crushing cylinder 31, and the end portion entry speed of the pulp 9 is made slower than the unrestrained pull-in speed.

  Next, the structure downstream from the pulp crushing mechanism 3 of the absorbent body manufacturing apparatus 1 shown in FIG. 1 will be described. The pulverized pulp generated by the pulp pulverizing mechanism 3 is sent to the absorber forming mechanism 4 through the duct 41 by a blower mechanism (not shown) and supplied from the polymer supply unit 421 (for example, SAP ( Super Absorbent Polymer)) and sprayed onto the cylindrical adsorption drum 42. The suction drum 42 rotates clockwise in FIG. 1 and is pulverized pulp and water-absorbing polymer on the outer peripheral surface of the suction drum 42 provided with fine suction holes by a suction mechanism (not shown) connected to the inside. Is adsorbed to a predetermined height. The mixing of the water-absorbing polymer may be omitted depending on the absorption power required for the absorber 90.

  The pulverized pulp and the water-absorbing polymer adsorbed on the outer peripheral surface of the adsorbing drum 42 move to the (−Z) side of the adsorbing drum 42 as the adsorbing drum 42 rotates, and are fed out from the roll 43 and conveyed by the conveyor 401. It is transferred to the tissue paper 92 conveyed in the (−X) direction. An adhesive (for example, hot melt) is applied in advance to the upper surface of the tissue paper 92 by an adhesive supply unit 431, and the pulverized pulp and the water-absorbing polymer are adhered onto the tissue paper 92 to form a pulp layer 900. .

  While the pulp layer 900 is conveyed in the (−X) direction by the conveyor 401, an adhesive is applied to the surface on one side of the tissue paper 93 fed out from another roll 44 by the adhesive supply unit 441, and the tissue paper 93 Is adhered to the pulp layer 900 and the tissue paper 92 with the adhesive application surface facing the pulp layer 900. The pulp layer 900 wrapped in the tissue papers 92 and 93 from the (−Z) side and the (+ Z) side becomes a piece having a predetermined length in the cutting part 471 (because it becomes a core part of the absorber 90, hereinafter “ The absorbent core 901 is cut into 901, and the plurality of absorbent cores 901 are conveyed in the (−X) direction at a predetermined interval by the conveyor 402.

  Then, the top sheet 94 and the back sheet 95, which are fed out from the rolls 45 and 46 and coated with the adhesive from the adhesive supply parts 451 and 461 on one side, are over the tissue paper 93 and 92 of the absorbent core 901. Further, the top sheet 94 and the back sheet 95 are cut at the gap between the adjacent absorbent cores 901 by the cutting part 472 to form the absorbent body 90. The manufactured absorber 90 is carried out from the absorber manufacturing apparatus 1 by the conveyor 403.

  In the absorbent body manufacturing apparatus 1, as described above, the pulp pulverization mechanism 3 can improve the uniformity of the amount and quality of pulverized pulp produced per unit time, and thus improve the uniformity of the quality of the absorbent body 90. Can do.

  6 and 7 are an enlarged front view and a plan view showing the vicinity of the supply path 24 and the pulp crushing mechanism 3 of the absorbent body manufacturing apparatus according to the second embodiment of the present invention. In the absorbent body manufacturing apparatus according to the second embodiment, the crushing mechanism control section 51 is omitted from the control section 5 of the absorbent body manufacturing apparatus 1 shown in FIG. 1, and the pulp is disposed on the (+ X) side of the pulp crushing mechanism 3. A pressing mechanism 62 is provided. Other configurations are the same as those in FIG. 1, and the same reference numerals are given in the following description.

  As shown in FIGS. 6 and 7, the pulp pressing mechanism 62 has a pressing plate 621 that contacts the (+ Z) main surface of the pulp 9 through an opening 2411 (see FIG. 7) provided in the upper plate 241. The pressing plate 621 rotates about the rotation shaft 622.

  FIG. 8 is a diagram illustrating a flow of control of the pulp pressing mechanism 62 by the control unit 5. In addition, since the manufacturing process of the absorber 90 by the absorber manufacturing apparatus which concerns on 2nd Embodiment is the same as that of 1st Embodiment except the supply and grinding | pulverization of the pulp 9, it demonstrates about the overlapping part. To simplify.

  In the absorbent body manufacturing apparatus according to the second embodiment, the pulp is formed by the first upper roller 243, the first lower roller 244, the second upper roller 245, and the second lower roller 246, as in the first embodiment. 9 is smoothly supplied to the pulp crushing mechanism 3 while being guided by the upper plate 241 and the lower plate 242 and is crushed by the rotating crushing cylinder 31. When the end of the pulp 9 passes through the pulp passage sensor 61, the light from the light source 611 enters the light receiving element 612, and the output from the light receiving element 612 is sent to the crushing mechanism control unit 51 (see FIG. 1). 9 is detected (step S21). In order to detect the passage of the end of the pulp 9 with certainty, the conveyance of the next pulp 9 is controlled so that a slight gap is formed between the next pulp 9.

  In the control unit 5, after a predetermined time has elapsed since the passage of the rear end of the pulp 9 by the pulp passage sensor 61, the end of the pulp 9 is the pulp supply mechanism 2 (that is, the first upper roller 243 and the first lower roller 244). The pulp pressing mechanism 62 is driven. In the pulp pressing mechanism 62, the pressing plate 621 rotates counterclockwise from the position indicated by a two-dot chain line in FIG. 6 and comes into contact with the main surface on the (+ Z) side of the pulp 9. To give resistance to the movement of the pulp 9 (step S22). As a result, the end portion of the pulp 9 after passing through the pulp supply mechanism 2 enters the pulverization cylinder 31 at an end portion entry speed that is slower than the unrestrained pull-in speed and substantially equal to the supply speed by the pulp supply mechanism 2. .

  As described above, in the absorbent body manufacturing apparatus according to the second embodiment, the speed at which the pulp 9 is drawn in the supply direction by the rotation of the crushing cylinder 31 is reduced with a simple configuration, and the rotation speed of the crushing cylinder 31 is changed. It is possible to maintain a constant approach speed (that is, a supply speed of the pulp 9) to the pulverizing cylinder 31 in the vicinity of the end of the pulp 9 while keeping the pulp 9 constant without greatly changing the quality of the pulverized pulp 9 Can be suppressed.

  In the absorbent body manufacturing apparatus according to the second embodiment, as in the first embodiment, the difference between the end portion entry speed of the pulp 9 and the supply speed of the pulp 9 by the pulp supply mechanism 2 is the pulp supply mechanism. 2 is preferably 10% or less of the supply rate. Further, the rotation of the pulverizing cylinder 31 can reduce the maximum value of the force applied to the pulp 9 at the time of pulverization to improve the quality of the pulverized pulp, and maintain the supply speed of the pulp 9 near the end of the pulp 9. Together, high quality ground pulp can be produced.

  In the absorbent body manufacturing apparatus 1, while the terminal portion of the preceding pulp 9 that has passed through the pulp supply mechanism 2 is being crushed, the next pulp 9 moves through the supply path 24, and from the light receiving element 612 of the pulp passage sensor 61. Based on this output, the control unit 5 detects the passage of the front end of the subsequent pulp 9 (step S23).

  In the control unit 5, after a predetermined time has elapsed since the passage of the front end of the subsequent pulp 9 detected by the pulp passage sensor 61, the pulverization of the terminal portion of the preceding pulp 9 is finished. The pressing plate 621 is rotated clockwise in FIG. 6 to return to the position indicated by the two-dot chain line, and the pressing of the pulp 9 is released (step S24).

  Thus, in the absorbent body manufacturing apparatus according to the second embodiment, after one pulp 9 passes through the pulp supply mechanism 2 with respect to the pulp 9 that is sequentially supplied, the next pulp 9 is a pulverizing cylinder. Until it enters the outer peripheral surface of 31, resistance is given to the movement of the pulp 9 by the pulp pressing mechanism 62, and the end portion entry speed of the pulp 9 is made slower than the unrestrained pull-in speed.

  Downstream of the pulp crushing mechanism 3 of the absorber manufacturing apparatus according to the second embodiment, the pulverized pulp generated by the pulp crushing mechanism 3 is sent to the absorber forming mechanism 4 and mixed with the water-absorbing polymer. Then, after being wrapped with tissue paper 93 and 92 from above and below, it is cut and further wrapped with a top sheet 94 and a back sheet 95 to form an absorbent body 90. In the absorbent body manufacturing apparatus according to the second embodiment, as described above, the pulp crushing mechanism 3 can improve the amount of pulverized pulp produced per unit time and improve the uniformity of the quality. Similar to the absorbent body manufacturing apparatus 1 according to the embodiment, the quality uniformity of the absorbent body 90 can be improved.

  As mentioned above, although embodiment of this invention has been described, this invention is not limited to the said embodiment, A various change is possible.

  For example, a signal indicating that the pulp 9 has been passed from the pulp take-out mechanism 22 to the conveyor 23 is sent from the pulp supply mechanism 2 to the control unit 5, and the control unit 5 receives the signal for a predetermined time ( It is calculated | required from the distance of the X direction between the edge part of the (+ X) side of the conveyor 23, and the center of the 1st upper roller 243, and the supply speed of the pulp 9 by the pulp supply mechanism 2). It may be determined that the end has passed through the pulp supply mechanism 2. In this case, the pulp passage sensor 61 may be omitted.

  In the absorbent body manufacturing apparatus according to the second embodiment, a pressing roller that moves up and down with respect to the pulp 9 may be provided instead of the pressing plate 621 and the rotating shaft 622. At the time of pulverization of the end portion of the pulp 9, the pressing roller descends and comes into contact with the main surface on the (+ Z) side of the pulp 9, presses the pulp 9 against the lower plate 242, and gives resistance to the movement of the pulp 9. Is smoothly moved and supplied to the crushing cylinder 31. The pressure roller itself may have resistance to rotation, and the pressure roller may be provided on the (−Z) side of the pulp 9, and on the (+ Z) side and the (−Z) side. You may provide so that the pulp 9 may be pinched | interposed.

  The pulp pulverized by the pulp pulverization mechanism 3 may be in the form of a sheet. For example, roll-shaped pulp wound around a drum may be fed out and supplied to the pulp pulverization mechanism 3.

It is a figure which shows the structure of the absorber manufacturing apparatus which concerns on 1st Embodiment. It is a front view which expands and shows the supply path and the pulp crushing mechanism vicinity. It is a top view which expands and shows the supply path and the pulp crushing mechanism vicinity. It is a front view which expands and shows the site | part of the outer peripheral surface vicinity of a grinding | pulverization cylinder. It is a figure which shows the flow of control of the pulp crushing mechanism by a crushing mechanism control part. It is a front view which expands and shows the supply path and pulp crushing mechanism vicinity of the absorber manufacturing apparatus which concerns on 2nd Embodiment. It is a top view which expands and shows the supply path and the pulp crushing mechanism vicinity. It is a figure which shows the flow of control of the pulp press mechanism by a control part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Absorber manufacturing apparatus 2 Pulp supply mechanism 9 Pulp 31 Grinding cylinder 32 Grinding blade 51 Grinding mechanism control part 61 Pulp passage sensor 62 Pulp press mechanism 90 Absorber 242 Lower plate 311 Cylinder rotating shaft 321 Teeth S11-S14, S21-S24 Step

Claims (5)

A pulp crusher for crushing pulp for an absorber,
A pulp supply mechanism for supplying sheet-like pulp at a constant speed in a predetermined supply direction;
Downstream of the pulp supply mechanism, a pulverizing cylinder for pulverizing the pulp entering the outer peripheral surface by rotating at a predetermined rotation speed around a rotation axis parallel to the pulp;
A substantially plate-like support that supports the pulp entering the outer peripheral surface against the rotation of the outer peripheral surface;
Passage time acquisition means for acquiring a time when the end of the pulp passes through the pulp supply mechanism and the restriction of the pulp by the pulp supply mechanism is released;
By reducing the rotational speed of the grinding cylinder until the next pulp enters the outer peripheral surface of the grinding cylinder after the end of the pulp has passed through the pulp feeding mechanism, the pulp feeding mechanism at a slower rate than if the end of the pulp in a state in which constraints is released is drawn into the grinding cylinder rotating at the predetermined rotational speed, and a control circuit for entering the terminal portion of the pulp in the grinding cylinder An approach speed control means ;
A pulp crusher characterized by comprising: A pulp crusher for crushing pulp for an absorber,
A pulp supply mechanism for supplying sheet-like pulp at a constant speed in a predetermined supply direction;
Downstream of the pulp supply mechanism, a pulverizing cylinder for pulverizing the pulp entering the outer peripheral surface by rotating at a predetermined rotation speed around a rotation axis parallel to the pulp;
A substantially plate-like support that supports the pulp entering the outer peripheral surface against the rotation of the outer peripheral surface;
Passage time acquisition means for acquiring a time when the end of the pulp passes through the pulp supply mechanism and the restriction of the pulp by the pulp supply mechanism is released;
After the end of the pulp passes through the pulp supply mechanism, until the next pulp enters the outer peripheral surface of the grinding cylinder, resistance is provided to the movement of the end of the pulp, thereby supplying the pulp. An entry speed for allowing the end portion of the pulp to enter the crushing cylinder at a lower speed than when the end portion of the pulp released from the mechanism is pulled into the crushing cylinder rotating at the predetermined rotation speed. A control mechanism;
A pulp crusher characterized by comprising: The pulp crusher according to claim 2, wherein
The pulp crushing apparatus, wherein the mechanism includes a pressing mechanism that presses the end portion of the pulp against the support portion and provides resistance to movement of the end portion of the pulp. The pulp crusher according to any one of claims 1 to 3,
The difference between the speed at which the terminal portion of the pulp after passing through the pulp supply mechanism enters the grinding cylinder and the supply speed of the pulp by the pulp supply mechanism is 10% or less of the supply speed. A pulp crusher. The pulp crusher according to any one of claims 1 to 4,
The crushing cylinder includes a plurality of crushing blades arranged along the rotation axis;
Each of the plurality of crushing blades is substantially disc-shaped perpendicular to the rotation axis, and has a plurality of teeth at a constant pitch on the outer periphery.
A pulp crusher characterized in that a plurality of teeth of the plurality of crushing blades are spirally arranged on the outer peripheral surface of the crushing cylinder.

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