WO2012029573A1 - 吸収性物品に係るプレス装置、及びプレス方法 - Google Patents
吸収性物品に係るプレス装置、及びプレス方法 Download PDFInfo
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- WO2012029573A1 WO2012029573A1 PCT/JP2011/068843 JP2011068843W WO2012029573A1 WO 2012029573 A1 WO2012029573 A1 WO 2012029573A1 JP 2011068843 W JP2011068843 W JP 2011068843W WO 2012029573 A1 WO2012029573 A1 WO 2012029573A1
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- continuous sheet
- outer peripheral
- peripheral surface
- fibrous continuous
- fibrous
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
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- B29C66/90—Measuring or controlling the joining process
- B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
- B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
- B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
- B29C66/91631—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux the heat or the thermal flux being kept constant over time
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- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
- B29C43/28—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
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- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
- B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
- B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
- B29C66/91651—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux by controlling or regulating the heat generated by Joule heating or induction heating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/93—Measuring or controlling the joining process by measuring or controlling the speed
- B29C66/934—Measuring or controlling the joining process by measuring or controlling the speed by controlling or regulating the speed
- B29C66/93451—Measuring or controlling the joining process by measuring or controlling the speed by controlling or regulating the speed by controlling or regulating the rotational speed, i.e. the speed of revolution
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/48—Wearing apparel
- B29L2031/4871—Underwear
- B29L2031/4878—Diapers, napkins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
- B32B37/1207—Heat-activated adhesive
- B32B2037/1215—Hot-melt adhesive
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
- B32B2309/02—Temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
- B32B2309/70—Automated, e.g. using a computer or microcomputer
- B32B2309/72—For measuring or regulating, e.g. systems with feedback loops
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2555/00—Personal care
- B32B2555/02—Diapers or napkins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2301/00—Handling processes for sheets or webs
- B65H2301/40—Type of handling process
- B65H2301/43—Gathering; Associating; Assembling
- B65H2301/438—Finishing
- B65H2301/4382—Binding or attaching processes
- B65H2301/43822—Binding or attaching processes involving heating
Definitions
- the present invention relates to a pressing device and a pressing method according to an absorbent article such as a disposable diaper.
- the semi-finished product 2 in order to integrate the absorbent body 3 and the pair of upper and lower fibrous continuous sheets 6 and 4, the other fibrous continuous sheet among the both surfaces of the one fibrous continuous sheet 4 A hot melt adhesive (not shown) is applied to the surface on the side opposite to 6, so that these three members are bonded and integrated.
- the semi-finished product 2 is placed in a roll gap Gr between a pair of upper and lower press rolls 12, 12. In this case, the outer peripheral surfaces 12s and 12s of the press rolls 12 and 12 are clamped when passing.
- the hot melt adhesive oozes out to the outer surface of the sheets 6 and 4 through the inter-fiber gaps of the fibrous continuous sheets 6 and 4, and adheres to the outer peripheral surface 12s of the press roll 12. There is a risk of soiling, and the cleaning must be done regularly.
- the fibrous continuous sheets 6 and 4 are firmly attached to the outer peripheral surface 12 s of the press roll 12 due to the adhesive force. If the adhered fibrous continuous sheets 6 and 4 are not quickly peeled off from the outer peripheral surface 12s on the exit side of the roll gap Gr, the fibrous continuous sheets 6 and 4 are torn, and the production line Forced to stop.
- the present invention has been made in view of the conventional problems as described above, and its purpose is to reduce adhesion of adhesive to the outer peripheral surface of the roll and adhesion of the fibrous continuous sheet to the outer peripheral surface. There is to do.
- the main invention for achieving the above object is: It comprises a pair of rolls that are driven and rotated with their outer peripheral surfaces facing each other, When the fibrous continuous sheet in a state where the polymer is superposed via a thermoplastic adhesive is passed along the continuous direction in the roll gap between the pair of rolls, the outer peripheral surface causes the polymer and the polymer to overlap each other.
- a pressing device for integrally pressing the fibrous continuous sheet A heating mechanism for heating at least the roll located on the fibrous continuous sheet side of the pair of rolls is provided, and the temperature of the outer peripheral surface of the roll falls within a range of 70 ° C. to 120 ° C. by the heating mechanism.
- the press apparatus according to the absorbent article, wherein the roll is heated as described above.
- a pressing method in which the polymer and the fibrous continuous sheet are pressed together by the outer peripheral surface, Heating the roll so that the temperature of the outer peripheral surface of the roll positioned at least on the fibrous continuous sheet side of the pair of rolls falls within a range of 70 ° C. to 120 ° C .;
- the outer peripheral surface of the roll in which the temperature of the outer peripheral surface is within the above range includes pressing the polymer passing through the gap between the roll and the fibrous continuous sheet integrally.
- FIG. 2A is a schematic perspective view of the press device 10 according to the present embodiment
- FIG. 2B is a side view thereof. It is a perspective view of other aspects 2a of semi-finished product 2. It is a schematic side view of the modification 10a of the press apparatus 10.
- It comprises a pair of rolls that are driven and rotated with their outer peripheral surfaces facing each other, When the fibrous continuous sheet in a state where the polymer is superposed via a thermoplastic adhesive is passed along the continuous direction in the roll gap between the pair of rolls, the outer peripheral surface causes the polymer and the polymer to overlap each other.
- a pressing device for integrally pressing the fibrous continuous sheet A heating mechanism for heating at least the roll located on the fibrous continuous sheet side of the pair of rolls is provided, and the temperature of the outer peripheral surface of the roll falls within a range of 70 ° C. to 120 ° C. by the heating mechanism.
- the press apparatus according to the absorbent article, wherein the roll is heated as described above.
- the temperature of the outer peripheral surface of the roll that comes into contact with the fibrous continuous sheet is held in the range of 70 ° C. to 120 ° C. during clamping. Therefore, even when the adhesive oozes out toward the outer peripheral surface through the inter-fiber gap of the fibrous continuous sheet, adhesion of the adhesive to the outer peripheral surface and the fibrous continuous sheet to the outer peripheral surface Sticking is effectively suppressed.
- a press device it is desirable that the temperature of the outer peripheral surface be within a range of 80 ° C. to 110 ° C.
- the temperature of the outer peripheral surface of the roll that comes into contact with the fibrous continuous sheet is held in the range of 80 ° C. to 110 ° C. during clamping. Therefore, even when the adhesive oozes out toward the outer peripheral surface, adhesion of the adhesive to the outer peripheral surface and sticking of the fibrous continuous sheet to the outer peripheral surface are more effectively suppressed.
- thermoplastic adhesive is a hot melt adhesive
- fibrous continuous sheet is preferably a tissue paper. According to the press device according to such an absorbent article, the above-described suppression effect can be enjoyed effectively.
- a press device In the fibrous continuous sheet, the absorbent body according to the absorbent article is intermittently placed along the continuous direction of the fibrous continuous sheet, When the fibrous continuous sheet is a first fibrous continuous sheet, the absorber is covered with a second fibrous continuous sheet, whereby the second fibrous continuous sheet, the first fibrous continuous sheet, Is sandwiched between
- the heating mechanism preferably heats both rolls of the pair of rolls so that the temperature of the outer peripheral surfaces of both rolls is within a range of 70 ° C. to 120 ° C.
- the surface temperature is set within the range of 70 ° C to 120 ° C. Therefore, adhesion of the adhesive to the outer peripheral surface and sticking of the fibrous continuous sheet to the outer peripheral surface can be effectively suppressed.
- a pressing method in which the polymer and the fibrous continuous sheet are pressed together by the outer peripheral surface, Heating the roll so that the temperature of the outer peripheral surface of the roll positioned at least on the fibrous continuous sheet side of the pair of rolls falls within a range of 70 ° C. to 120 ° C .;
- the outer peripheral surface of the roll in which the temperature of the outer peripheral surface is within the above range includes pressing the polymer passing through the gap between the roll and the fibrous continuous sheet integrally.
- the temperature of the outer peripheral surface of the roll that comes into contact with the fibrous continuous sheet is held in the range of 70 ° C. to 120 ° C. during clamping. Therefore, even when the adhesive oozes out toward the outer peripheral surface through the inter-fiber gap of the fibrous continuous sheet, adhesion of the adhesive to the outer peripheral surface and the fibrous continuous sheet to the outer peripheral surface Sticking is effectively suppressed.
- FIG. 2A and 2B are explanatory views of the press device 10 according to the present embodiment.
- FIG. 2A is a schematic perspective view of the press device 10, and
- FIG. 2B is a side view thereof.
- the absorber 3 of the semi-finished product 2 is not illustrated.
- the press device 10 is used in a disposable diaper production line as an example of an absorbent article. Then, for example, the diaper semi-finished product 2 is supplied to the press device 10 in a continuous state in the conveying direction, and the press device 10 presses the semi-finished product 2 in the thickness direction and sends it out to the lower process.
- the semi-finished product 2 is, for example, a first fibrous continuous sheet 4 that is continuously conveyed in the conveying direction, and a polymerization that is superimposed on the upper surface of the first fibrous continuous sheet 4 at a product pitch intermittently in the conveying direction.
- the absorbent body 3 is obtained by laminating pulp fibers as liquid absorbent fibers in a predetermined shape such as a substantially rectangular parallelepiped with a basis weight of, for example, 100 to 400 (g / m 2 ).
- a superabsorbent polymer hereinafter also referred to as SAP
- SAP is mixed in the absorber 3, but it may not be mixed.
- SAP is mixed at a basis weight of 50 to 300 (g / m 2 ).
- first and second fibrous continuous sheets 4 and 6 include nonwoven fabrics. Specifically, examples thereof include wet nonwoven fabrics such as tissue paper containing wood pulp fibers, dry nonwoven fabrics containing short synthetic fibers and semi-synthetic fibers such as rayon.
- the wet nonwoven fabric refers to a nonwoven fabric bonded after forming on a wire mesh in a fiber dispersion
- the dry nonwoven fabric refers to a nonwoven fabric bonded after forming a web with a card device.
- a tissue paper having a basis weight of 12 to 20 (g / m 2 ) made of wood pulp fibers is used for both the first and second fibrous continuous sheets 4 and 6.
- the tensile strength in the transport direction of the tissue paper is 5 to 10 (N / 25 mm), and the tensile strength in the width direction is 1 to 5 (N / mm).
- the description of “25 mm” in the denominator relating to the unit of the former tensile strength indicates that the displayed value of the tensile strength is the tensile strength per 25 mm width.
- the surface of the side which opposes the absorber 3 among the both surfaces which the sheet 4 (6) comprises
- a hot melt adhesive as a thermoplastic adhesive is applied over substantially the entire surface with a predetermined application pattern (for example, a plurality of wavy line patterns along the transport direction). Therefore, based on the adhesive force of the said adhesive agent, the three of the absorber 3, the 1st fibrous continuous sheet 4, and the 2nd fibrous continuous sheet 6 are mutually joined.
- the adhesive is applied to the upper surface before the absorbers 3, 3.
- the absorbent body 3 is bonded to the portion where the absorbent body 3 overlaps, while the portion 4 a that protrudes outward in the width direction from the absorbent body 3 or the absorption adjacent to the conveyance direction.
- the second fibrous continuous sheet 6 is abutted and bonded. Thereby, these three are joined and integrated in the form where the absorber 3 is sandwiched between the first fibrous continuous sheet 4 and the second fibrous continuous sheet 6.
- the application target is the second fibrous continuous sheet 6
- the second fibrous continuous sheet 6 is superimposed from above the first fibrous continuous sheet 4 on which the absorbent bodies 3, 3.
- an adhesive is applied to the lower surface of the second fibrous continuous sheet 6.
- the absorbent body 3 is adhered to a portion where the absorbent body 3 overlaps, while the portion 6 a protruding outward in the width direction from the absorbent body 3, or adjacent to the conveyance direction.
- the first fibrous continuous sheet 4 is abutted and bonded. Thereby, these three are joined and integrated in the form where the absorber 3 is sandwiched between the first fibrous continuous sheet 4 and the second fibrous continuous sheet 6.
- hot melt adhesives examples include synthetic rubber hot melt adhesives (hot melt adhesives having a base polymer of synthetic rubber such as SIS, SBS, SEPS, SEBS), and polyolefin hot melt adhesives (PE, PP, etc.). Examples thereof include a hot melt adhesive having a polyolefin base polymer.
- MQ-654E trade name (manufactured by Henkel Japan) is used.
- the coating amount per unit area of the adhesive is set to 2 to 10 (g / m 2 ).
- the hot melt adhesive is applied by being discharged from a nozzle or the like of an appropriate adhesive application device, and the temperature of the adhesive at the time of discharge is set to, for example, 140 ° C. to 160 ° C. by heating or the like.
- the viscosity is, for example, 2000-200000 (cP).
- the pressing device 10 is a device that clamps the semi-finished product 2 in the thickness direction in order to reduce the semi-finished product 2 to a predetermined thickness.
- the compressive load related to the pinching pressure is set to, for example, 35000 to 140000 (N / m) per unit width.
- the hot melt adhesive is still in an unsolidified state, that is, in a state of fluidity, so that the hot melt adhesive extends over substantially the entire surface of the fibrous continuous sheets 4 and 6 by the pinching pressure.
- the joint strength of the semi-finished product 2 is increased as a whole.
- the conveyance direction of the semi-finished product 2 is also called “MD direction”, and also the width direction of the semi-finished product 2 among the directions orthogonal to MD direction (The width direction of the continuous fibrous sheets 4 and 6) is also referred to as “CD direction”.
- CD direction is, for example, the horizontal direction, and in FIG. 2B, is the direction penetrating the paper surface.
- the press device 10 includes a pair of upper and lower press rolls 12 and 12 that are driven and rotated with the outer peripheral surfaces 12s and 12s facing each other, and the temperatures of the outer peripheral surfaces 12s and 12s are predetermined. And a heating mechanism that heats each of the rolls 12 and 12 so as to fall within the target temperature range.
- the temperature of the outer peripheral surfaces 12s, 12s is kept within the target temperature range of 70 ° C to 120 ° C. However, the semi-finished product 2 is clamped by these outer peripheral surfaces 12s and 12s.
- Each press roll 12 is a flat roll having a smooth outer peripheral surface 12s, for example, and these press rolls 12 and 12 can be rotated around rotation axes C12 and C12 parallel to the CD direction by bearing members (not shown), respectively. It is supported. Then, the driving rotational force is input from a motor (not shown) as a driving source via a speed reducer and the like, whereby each press roll 12 is driven to rotate along the MD direction.
- the peripheral speed V12 of each press roll 12 is changed in the range of 100 (m / min) to 600 (m / min) in conjunction with the conveyance speed V2 of the semi-finished product 2.
- the press apparatus 10 includes a speed control unit (not shown) such as a computer or a PLC (programmable logic controller), and the rotation of the motor is controlled by the speed control unit.
- the product 2 is rotated so that the transport speed V2 and the peripheral speed V12 are aligned while being synchronized with the transport speed V2 of the product 2.
- the press roll 12 is made of S45C steel, but the material is not limited to this.
- it may be made of a non-ferrous metal such as aluminum or copper, or may be made of a non-metal such as a resin if it has appropriate heat resistance and thermal conductivity.
- the heating mechanism is a device for suppressing the adhesion of the hot melt adhesive to the outer peripheral surface 12s of the press roll 12 and the sticking of the fibrous continuous sheets 6 and 4 to the outer peripheral surface 12s.
- the upper and lower continuous sheets 6, 4 forming the upper and lower surfaces are fibrous sheets as described above.
- the hot melt adhesive inside the semi-finished product 2 may ooze out to the upper and lower surfaces which are the outer surfaces of the sheets 6, 4 through the interfiber spaces of the respective fibrous continuous sheets 6, 4. obtain.
- the exuding adhesive adheres to and stains the outer peripheral surfaces 12s and 12s of the press rolls 12 and 12, and in some cases, accumulates on the outer peripheral surfaces 12s and 12s, and the adhesive action of the deposited adhesive.
- the fibrous continuous sheets 6 and 4 are attached to the outer peripheral surfaces 12 s and 12 s and wound, and as a result, the fibrous continuous sheets 6 and 4 are torn.
- the production line must be stopped, and recovery work such as removal of the torn fibrous continuous sheets 6 and 4 and cleaning of the outer peripheral surfaces 12s and 12s must be performed, resulting in a decrease in productivity. I will invite you. Therefore, for the purpose of suppressing the adhesion of the hot melt adhesive to the outer peripheral surface 12s of the press roll 12 and the sticking of the fibrous continuous sheets 6 and 4 to the outer peripheral surface and preventing the sheets 6 and 4 from being damaged.
- Each press roll 12 is heated, and the temperature of the outer peripheral surface 12s is kept within the target temperature range of 70 ° C. to 120 ° C.
- the reason why the adhesion of the adhesive and the sticking of the continuous fibrous sheets 6 and 4 are suppressed by being within this target temperature range will be described later.
- the heating mechanism having such a function is based on a heating element 22 inserted into the press roll 12, a temperature sensor 24 for measuring the temperature of the outer peripheral surface 12 s of the press roll 12, and a temperature signal output from the temperature sensor 24. And a temperature control unit (not shown) that controls the amount of heat generated by the heating element 22.
- the heating elements 22 and 22 and the temperature sensors 24 and 24 are provided in association with each other for each press roll 12. And a temperature control part controls the emitted-heat amount of the corresponding heat generating body 22 based on the temperature signal of the temperature sensor 24, matching the temperature sensors 24 and 24 and the heat generating bodies 22 and 22, respectively. That is, the temperature signal of the temperature sensor 24 of the upper press roll 12 is used for temperature control of the heating element 22 in the upper press roll 12, and the temperature signal of the temperature sensor 24 of the lower press roll 12 is This is used for temperature control of the heating element 22.
- the heating element 22 is an electric heater, for example, and generates heat based on the supplied electric power.
- the temperature control unit supplies and stops power. For example, if the indicated value of the temperature signal from the temperature sensor 24 is 85 ° C. or less as the first threshold value that is higher than 70 ° C. that is the lower limit value of the target temperature range, the temperature control unit supplies power to the heating element 22, On the other hand, if the indicated value of the temperature signal from the temperature sensor 24 becomes 105 ° C. or more as the second threshold value which is lower than 120 ° C. which is the upper limit value of the target temperature range and higher than the first threshold value, the power supply is stopped. .
- the temperature control unit is, for example, a computer, a PLC, or the like, and performs a control operation as described above when a processor included in the temperature control unit reads and executes an appropriate program from a memory.
- the insertion position of the heating element 22 is determined at a point-symmetrical position with respect to the rotation axis C12 so that the outer peripheral surface 12s of the press roll 12 is heated uniformly over the entire circumference.
- each press roll 12 is formed with one accommodation hole 22h for accommodating the substantially rod-shaped heating element 22 along the rotation axis C12, with the center of the hole 22h being coincident with the rotation axis C12.
- the present invention is not limited to this.
- a plurality of housing holes are formed at positions that equally divide the entire circumference of the press roll 12 in the circumferential direction and are equidistant from the outer peripheral surface 12s in the radial direction. 22 may be accommodated.
- a non-contact temperature sensor that can measure the temperature of the outer peripheral surface 12s of the press roll 12 as a temperature measurement object in a non-contact state with the outer peripheral surface 12s is used.
- An example of such a non-contact type temperature sensor is a radiation thermometer that measures temperature based on the amount of radiation of the temperature measurement object.
- a contact thermometer may be used. That is, the temperature of the outer peripheral surface 12 s may be measured by bringing a temperature detection unit such as a thermocouple into sliding contact with the outer peripheral surface 12 s of the press roll 12.
- the hot melt adhesive adheres to the outer peripheral surface 12s of the press roll 12 and the fibrous continuous to the outer peripheral surface 12s. The reason why sticking of the sheet 4 (6) is suppressed and damage to the sheet 4 (6) is prevented will be described.
- Agglomeration means that the adhesive becomes a lump.
- Cohesive failure means that the adhesive that has agglomerated into a lump is torn off, such as by being pulled.
- High anchoring property means that, for example, the adhesive spreads between the fiber gaps of the fibrous continuous sheet 4 (6), so that the adhesive is difficult to be detached from the fibrous continuous sheet 4 (6). In other words, the adhesive is easily retained by being locked to the fibrous continuous sheet 4 (6).
- the temperature of the hot-melt adhesive when the fibrous continuous sheet 4 (6) reaches the roll gap Gr of the press roll 12 is lowered to about 40 ° C. to 60 ° C. Therefore, the adhesive immediately before reaching the roll gap Gr is in a generally aggregated state while adhering to the fibers of the fibrous continuous sheet 4 (6).
- the temperature of the outer peripheral surface 12s of the press roll 12 is higher than 120 ° C.
- the temperature of the outer peripheral surface 12s is much higher than the temperature of the adhesive.
- the adhesive of 4 (6) comes into contact, a large amount of heat is input from the outer peripheral surface 12s to the adhesive. Due to this large heat input, the adhesive of the fibrous continuous sheet 4 (6) immediately softens and melts, causes cohesive failure and adheres to the outer peripheral surface 12s of the press roll 12, and as a result, relatively quickly. A large amount of adhesive accumulates on the outer peripheral surface 12s.
- the fibrous continuous sheet 4 (6) is bonded to the outer peripheral surface 12 s through the deposited adhesive, but here, the bonding strength is assumed to be the tensile strength of the fibrous continuous sheet 4 (6). If it is much lower than that, the continuous fibrous sheet 4 (6) is removed from the outer peripheral surface 12s by the conveying tension applied to the continuous fibrous sheet 4 (6) from the lower step on the exit side of the roll gap Gr. It is peeled off smoothly and is thus quickly transported to the lower process without tearing.
- the temperature of the outer peripheral surface 12 s is as high as 120 ° C. or more, a large amount of adhesive is deposited on the outer peripheral surface 12 s based on the cohesive failure of the adhesive as described above. Then, the adhesive force of the adhesive is also strengthened based on the large amount of accumulation, that is, the fibrous continuous sheet 4 (6) is attached to the outer peripheral surface 12s with high bonding strength through the adhesive, As a result, even if the conveyance tension acts on the fibrous continuous sheet 4 (6), the fibrous continuous sheet 4 (6) is stretched from the outer peripheral surface 12s without being peeled off.
- the fibrous continuous sheet 4 (6) is an aggregate of a large number of fibers, it tends to have a portion that is weaker in strength than the above-described bonding strength. Therefore, finally, by breaking the weak portion as a starting point, a part of the fibrous continuous sheet 4 (6) is brought to the press roll 12 while being stuck to the outer peripheral surface 12s, and the remaining portion Will be transported to the lower process. That is, the fibrous continuous sheet 4 (6) will be damaged.
- the outer peripheral surface 12 s of the press roll 12 is lower than 70 ° C.
- the temperature of the outer peripheral surface 12 s is relatively low. Therefore, the outer peripheral surface 12 s is an adhesive for the fibrous continuous sheet 4 (6).
- the amount of heat input to the adhesive when it comes into contact with is small. Accordingly, the softening / melting of the adhesive becomes light, and cohesive failure does not substantially occur, and adhesion of the adhesive to the outer peripheral surface 12s caused by cohesive failure is suppressed.
- the adhesive is in an agglomerated state and a low fluidity when being sandwiched between the roll gaps Gr, the adhesive is firmly pressed against the outer peripheral surface 12s, and the fibrous continuous is passed through the pressed adhesive.
- the sheet 4 (6) is firmly attached to the outer peripheral surface 12s.
- the fibrous continuous sheet 4 (6) attached to the outer peripheral surface 12s is fibrous when the conveying tension is to be peeled off from the outer peripheral surface 12s on the exit side of the roll gap Gr.
- the continuous sheet 4 (6) is torn starting from a weak portion in strength.
- the adhesive when the outer peripheral surface 12s contacts the adhesive of the fibrous continuous sheet 4 (6) when the temperature of the outer peripheral surface 12s of the press roll 12 is in the range of 70 ° C. to 120 ° C., the adhesive when the outer peripheral surface 12s contacts the adhesive of the fibrous continuous sheet 4 (6).
- the amount of heat input becomes an appropriate amount with almost no excess and deficiency, and this heat input causes the adhesive to have appropriate cohesiveness and fluidity. Therefore, when the adhesive of the fibrous continuous sheet 4 (6) contacts the outer peripheral surface 12s, a large cohesive failure does not occur, and adhesion of the adhesive to the outer peripheral surface 12s is suppressed.
- the adhesive since the adhesive has an appropriate fluidity, it spreads quickly between the fiber gaps of the fibrous continuous sheet 4 (6) at the time of clamping, whereby the adhesive becomes the fibrous continuous sheet 4 (6). It becomes easy to stay in. That is, the anchor property of the adhesive with respect to the fibrous continuous sheet 4 (6) is improved, and this also contributes to the suppression of the adhesion of the adhesive to the outer peripheral surface 12s. Furthermore, since the adhesive is flexibly deformed at the time of clamping based on the above moderate fluidity, it is possible to prevent the adhesive from being firmly pressed against the press roll 12.
- the fibrous continuous sheet 4 (6) is firmly attached to the outer peripheral surface 12s.
- the fibrous continuous sheet 4 (6) is disposed on the exit side of the roll gap Gr. Due to the conveying tension acting in this manner, it is smoothly peeled off from the outer peripheral surface 12s of the press roll 12, and the breakage of the fibrous continuous sheet 4 (6) is prevented.
- the temperature of the outer peripheral surface 12s of the press roll 12 be within a range of 80 ° C. to 110 ° C., which is narrower than the aforementioned 70 ° C. to 120 ° C.
- the semi-finished product 2 is sandwiched between the upper and lower press rolls 12 and 12.
- the outer peripheral surfaces 12s and 12s of the upper and lower press rolls 12 and 12 are heated so that the temperature is 70 ° C to 120 ° C.
- the press roll 12 located on the side of the non-bleeded surface is not heated and heated only on the press roll 12 located on the side of the oozed surface. May be.
- the hot melt adhesive is applied from the lower surface of the semi-finished product 2. Does not ooze out. Therefore, in this case, the heating element 22 and the temperature sensor 24 may be provided only for the upper press roll 12 without providing the heating element 22 and the temperature sensor 24 for the lower press roll 12.
- the absorber 3 is interposed between the pair of upper and lower fibrous continuous sheets 6, 4 .
- the absorber 3 is not interposed between the pair of upper and lower fibrous continuous sheets 6, 4, and the second fibrous continuous sheet 6 and the first fibrous continuous sheet 4 are in contact with each other over the entire surface.
- It may be a semi-finished product.
- one sheet 4 (6) corresponds to the “fibrous continuous sheet” in the claims
- the other sheet 6 (4) corresponds to the “polymer” in the claims.
- the number of stacked sheets 6 and 4 is not limited to two, but may be three or more.
- the sheet 4 (6) other than the continuous sheet 6 (4) forming the one surface may not be a fibrous sheet.
- the semi-finished product 2a As shown in the perspective view of FIG. 3, only a plurality of absorbent bodies 3, 3... As a polymer are adhered to one surface of the fibrous continuous sheet 4.
- the semi-finished product 2a can be exemplified. That is, the fibrous continuous sheet 4 is provided only on the lower surface side of the absorbent body 3 and may not be provided on the upper surface side. In that case, it goes without saying that the hot melt adhesive is selectively applied only to the portion of the fibrous continuous sheet 4 on which each absorber 3 is placed, and not to the portion where it is not placed.
- the hot melt adhesive is not applied to the protruding portion 4a.
- the absorber 3 is not continuously placed in a strip shape in the MD direction but is intermittently placed in an island shape in the MD direction as shown in FIG. 4, the fibrous continuous sheet In FIG. 4, the hot melt adhesive is not applied to the portion 4b between the absorbent bodies 3 and 3 as well.
- the heating element 22 and the temperature sensor 24 are provided only for the lower press roll 12 that is a roll located on the fibrous continuous sheet 4 side,
- the upper press roll 12 may not be provided. This is because it is considered that there is almost no oozing out of the hot melt adhesive to the upper surface of the absorbent body 3 because the fiber 3 is densely laminated.
- a heating element 22 and a temperature sensor 24 may be provided for the upper press roll 12.
- FIG. 4 is a schematic side view of a modified example 10 a of the press device 10.
- the pair of upper and lower press rolls 12 and 12 have the semi-finished product 2 in a state where the second fibrous continuous sheet 6, the absorber 3, and the first fibrous continuous sheet 4 are integrally overlapped. Have been supplied (FIG. 2A).
- the first fibrous continuous sheet 4 on which the absorber 3 is placed and the second fibrous continuous sheet are placed on the pair of upper and lower press rolls 12, 12.
- the sheets 6 are supplied separately in a state of being separated from each other, and the continuous sheets 4 and 6 are overlapped and joined and integrated in a roll gap Gr between the press rolls 12 and 12.
- the first fibrous continuous sheet 4 is conveyed to the press rolls 12 and 12 along the horizontal direction, for example.
- the 2nd fibrous continuous sheet 6 is conveyed by the press rolls 12 and 12 by the conveyance path
- a hot melt adhesive applicator 30 is disposed in the conveyance path, and the hot melt adhesive is applied to the surface of the continuous sheet 6 that should face the absorber 3 by using the applicator 30.
- the agent is applied over substantially the entire surface in a predetermined application pattern.
- the upper press roll 12 is wound around the outer peripheral surface 12s at a winding angle of approximately 90 ° and is transported integrally with the outer peripheral surface 12s to the roll gap Gr. In the roll gap Gr, the upper surface of the first fibrous continuous sheet 4 is conveyed.
- the second fibrous continuous sheet 6 is joined to the first fibrous continuous sheet 4 so as to sandwich the absorber 3 with the first fibrous continuous sheet 4.
- the adhesive may ooze out from the upper surface of the second fibrous continuous sheet 6 to be in contact with the outer peripheral surface 12s of the upper press roll 12 as in the above-described embodiment.
- the adhesive may ooze out from the lower surface of the first fibrous continuous sheet 4 to be in contact with the outer peripheral surface 12s of the lower press roll 12. Therefore, the above-described heating elements 22 and 22 and temperature sensors 24 and 24 are provided for the pair of upper and lower press rolls 12 and 12, respectively.
- the temperatures of the outer peripheral surfaces 12s and 12s of the press rolls 12 and 12 are within the range of 70 ° C to 120 ° C.
- one of the pair of upper and lower rolls may be an embossing roll having a plurality of convex portions protruding from the outer peripheral surface, and the other roll may be an anvil roll having a smooth outer peripheral surface that receives the convex portions. Both rolls may be embossed rolls.
- a disposable diaper that is attached to a wearing target and absorbs the excretory fluid thereof is exemplified, but any of those that absorb excretory fluid such as urine and menstrual blood can be used.
- a sanitary napkin or a pet sheet that absorbs the excretory fluid of the pet may be used.
- the configuration in which the electric heater is used as the heating element 22 of the heating mechanism is illustrated, but the configuration is not limited to this as long as the press roll 12 can be heated.
- an induction heating device may be used as the heating mechanism. That is, the induction heating device includes a dynamic magnetic field generation unit that is disposed so as to face the outer peripheral surface 12 s of the press roll 12 in a noncontact manner.
- the dynamic magnetic field generating unit applies a high-frequency dynamic magnetic field to the outer peripheral surface 12s
- an eddy current is generated on the outer peripheral surface 12s by the action of the dynamic magnetic field.
- the outer peripheral surface 12s generates heat due to the eddy current, and the outer peripheral surface 12s is thereby heated.
- a conductive material roll is used for the press roll 12.
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- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Manufacturing & Machinery (AREA)
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Abstract
Description
そして、この半製品2を製品ピッチで分断して、使い捨ておむつに使用している(特許文献1)。
互いの外周面を対向させて駆動回転する一対のロールを具備し、
前記一対のロール同士の間のロール間隙に、熱可塑性接着剤を介して重合物が重ね合わされた状態の繊維状連続シートをその連続方向に沿って通す際に、前記外周面によって前記重合物と前記繊維状連続シートとを一体に挟圧するプレス装置であって、
前記一対のロールのうちで少なくとも前記繊維状連続シートの側に位置するロールを加熱する加熱機構を有し、前記加熱機構によって、前記ロールの外周面の温度が70℃~120℃の範囲に収まるように前記ロールが加熱されることを特徴とする吸収性物品に係るプレス装置。
互いの外周面を対向させて駆動回転する一対のロール同士の間のロール間隙に、熱可塑性接着剤を介して重合物が重ね合わされた状態の繊維状連続シートをその連続方向に沿って通す際に、前記外周面によって前記重合物と前記繊維状連続シートとを一体に挟圧するプレス方法であって、
前記一対のロールのうちで少なくとも前記繊維状連続シートの側に位置するロールの外周面の温度が、70℃~120℃の範囲に収まるように前記ロールを加熱することと、
前記外周面の温度が前記範囲に収められた前記ロールの外周面によって、前記ロール間隙を通過する前記重合物と前記繊維状連続シートとを一体に挟圧することと、を有することを特徴とする吸収性物品に係るプレス方法。
前記一対のロール同士の間のロール間隙に、熱可塑性接着剤を介して重合物が重ね合わされた状態の繊維状連続シートをその連続方向に沿って通す際に、前記外周面によって前記重合物と前記繊維状連続シートとを一体に挟圧するプレス装置であって、
前記一対のロールのうちで少なくとも前記繊維状連続シートの側に位置するロールを加熱する加熱機構を有し、前記加熱機構によって、前記ロールの外周面の温度が70℃~120℃の範囲に収まるように前記ロールが加熱されることを特徴とする吸収性物品に係るプレス装置。
このような吸収性物品に係るプレス装置によれば、挟圧時には、繊維状連続シートと当接するロールの外周面の温度は、70℃~120℃の範囲に収められている。よって、接着剤が繊維状連続シートの繊維間隙間を通って外周面の方へ染み出した場合であっても、当該外周面への接着剤の付着や同外周面への繊維状連続シートの貼り付きは有効に抑制される。
前記外周面の温度が80℃~110℃の範囲に収められているのが望ましい。
このような吸収性物品に係るプレス装置によれば、挟圧時には、繊維状連続シートと当接するロールの外周面の温度は、80℃~110℃の範囲に収められている。よって、接着剤が外周面の方へ染み出した場合であっても、当該外周面への接着剤の付着や同外周面への繊維状連続シートの貼り付きは、より有効に抑制される。
前記熱可塑性接着剤はホットメルト接着剤であり、
前記繊維状連続シートは、ティッシュペーパーであるのが望ましい。
このような吸収性物品に係るプレス装置によれば、上述の抑制効果を有効に享受することができる。
前記繊維状連続シートには、前記吸収性物品に係る吸収体が前記繊維状連続シートの前記連続方向に沿って間欠的に載置されており、
前記繊維状連続シートを第1繊維状連続シートとした場合に、前記吸収体は、第2繊維状連続シートで覆われることにより、該第2繊維状連続シートと前記第1繊維状連続シートとで挟み込まれており、
前記加熱機構が前記一対のロールの両方のロールを加熱することにより、前記両方のロールの外周面の温度が70℃~120℃の範囲に収められているのが望ましい。
このような吸収性物品に係るプレス装置によれば、第1繊維状連続シート及び第2繊維状連続シートの両方の外面に接着剤が染み出す虞があるが、この点につき、各ロールの外周面の温度を70℃~120℃の範囲に収めるようにしている。よって、外周面への接着剤の付着や同外周面への繊維状連続シートの貼り付きを有効に抑制可能となる。
互いの外周面を対向させて駆動回転する一対のロール同士の間のロール間隙に、熱可塑性接着剤を介して重合物が重ね合わされた状態の繊維状連続シートをその連続方向に沿って通す際に、前記外周面によって前記重合物と前記繊維状連続シートとを一体に挟圧するプレス方法であって、
前記一対のロールのうちで少なくとも前記繊維状連続シートの側に位置するロールの外周面の温度が、70℃~120℃の範囲に収まるように前記ロールを加熱することと、
前記外周面の温度が前記範囲に収められた前記ロールの外周面によって、前記ロール間隙を通過する前記重合物と前記繊維状連続シートとを一体に挟圧することと、を有することを特徴とする吸収性物品に係るプレス方法。
このような吸収性物品に係るプレス方法よれば、挟圧時には、繊維状連続シートと当接するロールの外周面の温度は、70℃~120℃の範囲に収められている。よって、接着剤が繊維状連続シートの繊維間隙間を通って外周面の方へ染み出した場合であっても、当該外周面への接着剤の付着や同外周面への繊維状連続シートの貼り付きは有効に抑制される。
図2A及び図2Bは、本実施形態に係るプレス装置10の説明図である。図2Aは、プレス装置10の概略斜視図であり、図2Bは同側面図である。なお、図2Bでは、半製品2の吸収体3を不図示としている。
先ず、繊維状連続シート4(6)がプレスロール12のロール間隙Grに到達した時点のホットメルト接着剤の温度は、約40℃~60℃にまで降下している。よって、ロール間隙Grに到達直前の接着剤は、繊維状連続シート4(6)の繊維に付着しながら概ね凝集した状態にある。
上述の実施形態では、上下一対のプレスロール12,12には、第2繊維状連続シート6と、吸収体3と、第1繊維状連続シート4とが一体に重なった状態の半製品2が供給されていた(図2A)。これに対して、この変形例では、図4に示すように、上下一対のプレスロール12,12には、吸収体3が載置された第1繊維状連続シート4と、第2繊維状連続シート6とが互いに分かれた状態で別々に供給され、プレスロール12,12同士の間のロール間隙Grで、これら連続シート4,6が重なり合って接合一体化されるようになっている。
以上、本発明の実施形態について説明したが、本発明は、かかる実施形態に限定されるものではなく、以下に示すような変形が可能である。
Claims (5)
- 互いの外周面を対向させて駆動回転する一対のロールを具備し、
前記一対のロール同士の間のロール間隙に、熱可塑性接着剤を介して重合物が重ね合わされた状態の繊維状連続シートをその連続方向に沿って通す際に、前記外周面によって前記重合物と前記繊維状連続シートとを一体に挟圧するプレス装置であって、
前記一対のロールのうちで少なくとも前記繊維状連続シートの側に位置するロールを加熱する加熱機構を有し、前記加熱機構によって、前記ロールの外周面の温度が70℃~120℃の範囲に収まるように前記ロールが加熱されることを特徴とする吸収性物品に係るプレス装置。 - 請求項1に記載の吸収性物品に係るプレス装置であって、
前記外周面の温度が80℃~110℃の範囲に収められていることを特徴とする吸収性物品に係るプレス装置。 - 請求項1又は2に記載の吸収性物品に係るプレス装置であって、
前記熱可塑性接着剤はホットメルト接着剤であり、
前記繊維状連続シートは、ティッシュペーパーであることを特徴とする吸収性物品に係るプレス装置。 - 請求項1乃至3の何れかに記載の吸収性物品に係るプレス装置であって、
前記繊維状連続シートには、前記吸収性物品に係る吸収体が前記繊維状連続シートの前記連続方向に沿って間欠的に載置されており、
前記繊維状連続シートを第1繊維状連続シートとした場合に、前記吸収体は、第2繊維状連続シートで覆われることにより、該第2繊維状連続シートと前記第1繊維状連続シートとで挟み込まれており、
前記加熱機構が前記一対のロールの両方のロールを加熱することにより、前記両方のロールの外周面の温度が70℃~120℃の範囲に収められていることを特徴とするプレス装置。 - 互いの外周面を対向させて駆動回転する一対のロール同士の間のロール間隙に、熱可塑性接着剤を介して重合物が重ね合わされた状態の繊維状連続シートをその連続方向に沿って通す際に、前記外周面によって前記重合物と前記繊維状連続シートとを一体に挟圧するプレス方法であって、
前記一対のロールのうちで少なくとも前記繊維状連続シートの側に位置するロールの外周面の温度が、70℃~120℃の範囲に収まるように前記ロールを加熱することと、
前記外周面の温度が前記範囲に収められた前記ロールの外周面によって、前記ロール間隙を通過する前記重合物と前記繊維状連続シートとを一体に挟圧することと、を有することを特徴とする吸収性物品に係るプレス方法。
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JP6127901B2 (ja) * | 2013-10-21 | 2017-05-17 | セイコーエプソン株式会社 | シート製造装置、シート製造方法 |
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