JPH0780610B2 - Method of manufacturing disposable diapers - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for producing a disposable diaper.

More specifically, the present invention relates to a method of manufacturing a disposable diaper that has a first elastic tape in the horizontal direction at the upper end and the lower end and second elastic tapes in the substantially vertical direction on the left and right sides.

○ Prior art and its problems In the production of disposable diapers, in the well-known elastic tape application process, the sheet-like product that is the surface to be adhered is intermittently driven by the intermittent drive system. Elastic tape is attached.

Therefore, there is a problem that the work efficiency is poor and the product cost is high.

The applicant of the present application, as a means for solving the above drawbacks,
The elastic tape is supplied to the surface of the rotating drum whose axial direction is perpendicular to the conveying direction of the adherend sheet conveying device, the elastic tape is extended, and the elastic tape is adsorbed and supported on the adsorption supporting surface of the drum surface in the extended state. Then, the elastic tape is cut into a predetermined size in the suction supporting state, the suction supporting surface on the surface of the rotating drum is rotated, and the adhered sheet being conveyed by the adhesive sheet conveying device and the elastic sheet supported by the suction supporting surface. And the relative angle to the adherend sheet is set, and the relative angle to the adherend sheet is maintained at the set value, the elastic sheet is brought into pressure contact with the adherend sheet being conveyed by the adhesive sheet conveying device to adhere the elastic sheet to the adherend sheet. He invented a method of attaching an elastic tape and applied for a patent as Japanese Patent Application No. 62-153960.

The present invention relates to the above-mentioned prior invention relating to an elastic tape sticking method for adhering an elastic sheet to a sheet to be adhered. By applying to a method for producing a disposable diaper having a tape, the first elastic tape and the second elastic tape having different sticking directions are continuously supplied to and adhered to an adherend sheet to further improve work efficiency. The purpose is.

In the present invention, the suction support surface provided on the surface of the rotary drum in the above-mentioned prior invention has different rotation angles.
As a group, the elastic sheet is pasted at a position facing the sheet to be adhered with the sticking direction to the sheet to be adhered is orthogonal to the sheet to be conveyed and the direction substantially parallel to the sheet to be conveyed. In the production of the disposable diaper, the first elastic tape in the lateral direction is formed at the upper end and the lower end, and the second elastic tapes in the substantially vertical direction are formed on the left and right sides.

Example Before describing the invention of the present application, the invention of the prior application of Japanese Patent Application No. 62-53960 will be described first. FIG. 2 shows a product according to the invention of the prior application, which is a disposable diaper in which a top sheet or a pack sheet of a diaper is applied as an adherend sheet and an elastic tape is a waist elastic (waist elastic member).

Referring to FIG. 1, the rotary shaft 11 of the rotary drum (1) is orthogonal to the transport direction (a) of the adherend sheet transport device (2), and the elastic tape (A) is rotated in the rotary direction of the rotary drum (1). ) Supply.

The elastic sheet (A) is supplied to the surface of the rotary drum (1) by the elastic sheet supply device (3), and the elastic sheet supply device (3) is a supply roller (31) around which the elastic sheet (A) is wound. The extension roller (34) has a higher rotation speed than the conveyance roller (33) and extends the peripheral surface speed of the rotating drum (1). The elastic tape (A) is gradually extended as the rotation speed of the roller (33) approaches the surface of the rotating drum (1), and the elastic tape (A) is supplied to the surface of the rotating drum (1) in an expanded state.

An adsorption support surface (a) is provided on the surface of the rotating drum (1), and the elastic tape (A) supplied to the adsorption support surface (a) is adsorbed by the vacuum mechanism while the rotating drum is rotated to adhere the adherend sheet (A). ).

At that time, the elastic tape (A) is cut into a predetermined size by a cutter device (4) provided opposite to the peripheral surface of the rotary drum (1).

Further, the suction support surface (a) is rotated by the cam mechanism (6) installed in the rotary drum (1), and the relative angle of the elastic tape (A) with respect to the adherend sheet (B) is set to a predetermined value [eg 90.
(Orthogonal state)], the surface of the rotary drum is brought into pressure contact with the adherend sheet (B) being conveyed by the adherend sheet conveying device (2). At this time, the peripheral speed of the rotary drum (1) is made to substantially match the transfer speed of the adherend sheet transfer device,
The elastic sheet (A) is almost stopped with respect to the adherend sheet (B).

When the adhesive sheet (B) and the elastic tape (A) are heat-bonded, when the elastic tape (A) is pressed against the adhesive sheet (B) on the adherend sheet conveying device (2), rotation is performed. By providing a heating device so as to heat the elastic tape (A) from the inside of the drum (1) or the adhesive sheet (B) from the adherend sheet (B) side, the elastic tape (A) is adhered to the adherend sheet (B). ), But in the embodiment, the adhesive supply device (26) is provided opposite to the elastic tape (A) on the peripheral surface of the rotary drum (1), or the rotary drum (1) and the supply roller (31). ), The adhesive supply device (26) is provided so as to face the elastic tape (A) and the elastic tape (A) is pressed onto the adherend sheet (B).
The adhesive tape has been applied to the elastic tape (A), and the elastic tape (A) is pressed onto the adherend sheet (B) to obtain the elastic tape (A).
Is adhered to the adherend sheet (B) with an adhesive.

In the apparatus shown in FIG. 1, the adherend sheet (B) is used as the top sheet, and the mat (C) is adhered to the back surface of the top sheet (B) to which the elastic sheet (waist elastic) (A) is adhered. The back sheet (D) coated with the adhesive is pressed by a pressure roll (27) and then cut into a predetermined shape to complete a disposable diaper.

The rotary drum (1) will be described in detail with reference to FIGS. 3 to 5.

The support cylinder (12) is fixed by being eccentric to the support shaft (11), and the suction support base (5) is fixed to the upper ends of the pair of left and right leg pieces (13) loosely fitted in the support cylinder (12), The fork (14) is made to project laterally from one leg piece (13), and the pin (16) is made to project radially from the drive wheel (15) loosely fitted to the support shaft (11). The drive wheel 15 is driven to rotate by an appropriate drive means (for example, a motor and gear transmission), and the fork (14), the pin (16), and the leg piece (13).
The suction support base (5) is configured to be rotated via the.
The peripheral speed of the suction support base (5) changes between the upper position and the lower position because the support cylinder (12) is eccentric with respect to the support shaft (11), and the adherend sheet conveying device (2). The rotational speed of the drive wheel (15) is set so that the peripheral speed at the lower position facing the conveyance surface of is close to the conveyance speed of the adhesive sheet.

A disk-shaped recess is formed in the center of the suction support base (5), and a suction support plate (17) having an upper surface as a suction support surface is mounted on the recess, and the cam shown in FIGS. The suction support base (5) is rotated by the mechanism (6). The cam mechanism (6)
The arm (19) having the pin (20) below the suction support base (5) is integrated with the support plate (17) via the shaft (18), and the pin (20) is fixed to the support cylinder (12). It engages with the cam groove (6a) of the cam body (6 ') fixed to the peripheral surface of the rotary body, and the cam groove (6a) moves the rotary drum (1) half a turn (moves downward from above and upward from below). Thus, the suction support plate (17) is configured to rotate 90 degrees. If the relative angle between the adhesive sheet and the elastic sheet is not 90 degrees (orthogonal state) but an appropriate value such as 7 °, 25 °, the shape of the cam groove of the cam mechanism (6) should be the above relative angle. Decide according to the corner.

In the embodiment, five suction support base units having the above-described structure are provided, and the rotation of the drive wheel (15) causes the five elastic tapes (A) to be pressed against the adhesive sheet (B).

A large number of suction holes (21) are exposed in each suction support plate (17), and the suction holes (21) are communicated with the vacuum device (25) through the holes (22) (23) and the hose (24). The vacuum mechanism (7) is configured to suck and support the elastic tape (A) on the suction support plate (17) when the elastic tape (A) is rotated from the upper side to the lower side.

In the above embodiment, since the elastic tape (A) is adhered to the adherend sheet (B) in the orthogonal direction, the upper end or the lower end of the disposable diaper, the upper end of the synthetic resin sheet bag for storing products, etc. This can be applied when an elastic tape is attached to the adhesive tape, but the elastic tape (A) is attached to the adherend sheet (B).
It can be applied so as to bond at an appropriate relative angle with respect to each other. In the embodiment shown in FIG.
Set the shape of the cam groove so that the two suction support plates (17) are mounted on the shaft, the cam mechanism is a pair of left and right, and the elastic tape (A) is rotated by about 7 ° in the opposite direction by the cam mechanism. To do.

Next, an embodiment of the present invention will be described with reference to FIGS. 10 to 16.

FIG. 12 shows a product manufactured by carrying out the present invention,
3 illustrates a disposable diaper having an elastic sheet and a second elastic sheet. That is, in the disposable diaper manufactured by carrying out the present invention, the first elastic sheet (A1) that functions as a waist elastic (waist elastic member) at the upper end and the lower end, and the side elastics (A1) at both ends ( A disposable diaper having a second elastic sheet (A2) that functions as a crotch elastic member).

Further, as the adherend sheet B, the top sheet or back sheet of the diaper body is applied.
It is a top sheet (sheet to be adhered). In addition, (C) is a water absorption mat.

Adsorption support surface (a) of the rotating drum (1) in the invention of the prior application
The suction support base formed on the first and second suction support bases (5A) and
There are two types of suction support base (5B), and the first suction support base (5A) allows the first elastic tapes (A1) (A1), (A1) (A) in the lateral direction.
1) is supplied, and the second suction support base (5B) is used to supply the second elastic tapes (A2) (A2) in the vertical direction.
The two groups of the first adsorption support surface (a1) on the adsorption table (5A) and the second adsorption support surface (a2) on the second adsorption table (5B) constituted the adsorption support surface.

The elastic sheet feeding device 3 is provided in a pair on the left and right, and the first elastic tape (A1) and the second elastic tape (A2) are shared by using the same material and having the same width, and the operation control of the cutter devices 4, 4 is performed. It was cut into a predetermined size to have different sizes.

In addition, the first suction table (5A) is rotatably provided with suction support plates (17) and (17) having a pair of left and right first suction support surfaces (a1) so that the cam mechanism of the prior invention and other rotations can be rotated. While rotating from the upper end (supplied position) to the lower end (press contact position) by the means, the first elastic tape (A1) is rotated 90 ° and turned in a direction orthogonal to the conveying direction of the adherend sheet (B). The second suction table (5B) is configured to be a pair of left and right second suction surfaces (a
2), which adsorbs and supports the second elastic tape (A2), but does not change the angle when rotating from the upper end to the lower end, and the adhesive tape (B) is attached to the adherend sheet (B) in the same direction as the supply direction from the elastic tape supply device 3. The facing direction and the pasting direction are the conveyance direction of the adherend sheet (B).

The second elastic sheet (A2) can be rotated as shown in FIG. 13, and in this case, the cam mechanism shown in FIG. 9 can be applied, but as shown in FIG. It is also possible to pivot one end of the support plate (17) and rotate the second elastic tape (A2) by a desired predetermined angle by the pin (20) guided by the cam groove (6a).

Further, as shown in FIG. 15, the first elastic tape (A1) and the second elastic tape (A1)
The elastic tape (A2) and the elastic tape (A2) can be supplied from independent elastic sheet supply devices. In this case, it is convenient that both elastic tapes (A1) and (A2) having different materials and widths can be used if desired.

As shown in FIG. 16, attach the second elastic tape to (A2), (A
2 ') divided into two and rotated in opposite directions,
As shown in the figure, the first elastic tape (A1) may be a single unit.

15 and 16, the virtual line position of the elastic tape (A1) shows the upper end position of the rotating drum (1), and the solid line position shows the lower end position.

Effect of the Invention The present invention makes the peripheral speed of the rotating drum at the contact point with the tape to be adhered (diaper body) approximate to the running speed of the tape to be adhered, without intermittently stopping the rotary drum. The invention of the prior application relating to the step of attaching the elastic tape in the production of the disposable diaper, in which the elastic tape can be attached while the sheet is continuously traveling at a high speed, and the work efficiency can be increased to reduce the production cost. The above effect is also applied to the production of a disposable diaper having first elastic tapes in the lateral direction at the upper and lower ends and second elastic tapes in the substantially vertical direction on the left and right sides.

That is, the suction supporting surface provided on the surface of the rotary drum in the above-mentioned prior invention is divided into two groups each having a different rotation angle, and the sticking direction with respect to the sheet to be adhered at the position facing the sheet to be adhered is the sheet to be adhered. By feeding the elastic sheet to the pasting position in a state orthogonal to the conveyance direction and a direction substantially parallel to the adherend sheet and the conveyance direction,
In the production of disposable diapers, the first elastic tape in the horizontal direction is attached to the upper and lower ends, and the second elastic tape is attached to the left and right sides in the substantially vertical direction.
By forming the elastic tape, the first elastic tape and the second elastic tape whose attaching directions are different from each other are continuously supplied and adhered to each other to further improve the work efficiency.

In particular, by changing the attaching direction of a single elastic tape supplied from the elastic tape supply device, the first elastic tape and the second elastic tape having different attaching directions can be formed, and the first elastic tape can be formed. When manufacturing a disposable diaper having a tape and a second elastic tape, the manufacturing process is simplified and the working efficiency is improved to reduce the manufacturing cost.

[Brief description of drawings]

FIG. 1 is a perspective view showing the outline of an elastic tape sticking apparatus for carrying out the invention of the prior application, and FIG. 2 is a schematic view of a disposable diaper. 3 to 5 show a rotary drum,
FIG. 3 is a side view, FIG. 4 is a plan view, and FIG. 5 is a sectional view. FIG. 6 is a sectional view of the cam mechanism, FIG. 7 is a development view showing the cam groove, and FIG. 8 is an operation explanatory view showing rotation of the suction support plate corresponding to the cam groove of FIG. FIG. 9 is a schematic view showing a second embodiment of the rotary drum. FIGS. 10 to 16 show an embodiment of the present invention, FIG. 10 is a perspective view of a rotary drum, FIG. 11 is a developed plan view, and FIGS. 9 is a schematic view showing a direction change of the second elastic tape. FIG. 12 is a schematic diagram of a disposable diaper manufactured according to the present invention. FIG. 13 is a schematic diagram of a disposable diaper similarly showing another embodiment, and FIG. 14 is a schematic diagram showing a cam mechanism. 15 and 16 are schematic diagrams of a disposable diaper showing still another embodiment. A ... Elastic tape B ... Adhesive sheet 1 ... Rotating drum 2 ... Adhesive sheet conveying device 5 ... Suction support 6 ... Cam mechanism A1 ... First elastic tape A2 ... Second elastic tape a1 …… First suction support surface a2 …… Second suction support surface

Claims (1)

[Claims] 1. A method of manufacturing a disposable diaper having a first elastic tape in a horizontal direction at its upper and lower ends and second elastic tapes in a substantially vertical direction on its left and right sides, wherein the axial direction of the diaper is adhered sheet. The elastic tape is supplied to the surface of the rotating drum that is orthogonal to the conveying direction of the conveying device, the elastic tape is extended, and the elastic tape is adsorbed and supported on the adsorbing and supporting surface of the drum surface in the extended state, and the elastic tape in the adsorbing and supporting state. Is cut into a predetermined size, and the suction support surface on the surface of the rotary drum is rotated to set the relative angle between the adhered sheet being conveyed by the adhesive sheet conveying device and the elastic sheet supported on the suction support surface as a set value. , Adhesive tape sticking the elastic sheet to the adhesive sheet by pressing the elastic sheet against the adhesive sheet being conveyed by the adhesive sheet conveying device while maintaining the relative angle to the adhesive sheet at the set value A disposable diaper manufacturing method for manufacturing a disposable diaper by adhering a first elastic tape and a second elastic tape to an adherend sheet by a cleaning method, wherein: The first elastic tape is formed in two groups having different rotation angles, and at a position facing the sheet to be adhered and in a direction orthogonal to the conveying direction to the sheet to be adhered, and the sheet to be adhered and the conveying direction are formed. A method of manufacturing a disposable diaper, which comprises forming the second elastic sheet by setting the second elastic sheet in a substantially parallel state.