JPS60126301A - Attachment of elastic band to sanitary article - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Background of the Invention) Conventionally, in the production of absorbent articles such as disposable diapers, a method of intermittently joining an elastic band in a stretched state to a continuously moving web has been proposed, for example, by 37-262
It is disclosed in Japanese Patent No. 191.

According to the method of this patent, adhesive is intermittently applied to a continuous elastic band in its stretched state to join it to the web constituting the connected diaper, and the elastic band is bonded to the web in the non-adhesive area. By cutting at the same time and shrinking the non-applied area, the elastic band can be attached only to the area around the legs of each diaper. However, the method disclosed in this patent has a problem in that openings are formed at both ends of the diaper to contract the non-adhesive areas of the elastic band, and urine absorbed into the diaper leaks through the openings.

In addition, the elastic band bonded to the web remains continuous over a relatively long distance from the initial step of diaper manufacturing in which it is bonded to the web to near the final step in which it is cut together with the web, and without adhesive. Since the web is transported in a cured state, it may shift in the width direction of the web during the transport process and may not be properly joined in the final position.
This becomes a problem that cannot be overlooked when a plurality of thin rubber threads are used as elastic bands and are joined to the web in parallel at predetermined intervals.

(Object of the Invention) Therefore, the object of the present invention is to cut a continuous elastic band coated with an adhesive into a predetermined length in advance.

The object of the present invention is to provide a method for intermittently joining this to a continuously moving web constituting a connected article.

Another object of the present invention is to obtain individual articles by cutting a continuously moving web to which elastic bands cut into predetermined lengths are intermittently glued together in areas where the elastic bands are not located. It is also an object of the present invention to provide a method capable of sealing the cut end of the article.

Another object of the present invention is to join pre-cut elastic bands in the initial process of article manufacturing as described above, so that even when the elastic bands are made of a plurality of thread-like rubber, the elastic bands can be bonded together. The object of the present invention is to provide a method for preventing the elastic band from shifting or coming off in the width direction during the movement process of the elastic band.

Still other objects of the invention will become apparent from the following description of the invention.

(Summary of the Invention) The present invention provides a sanitary article in which stretched elastic bands are intermittently joined with an adhesive at predetermined intervals along the length of both sides of continuously moving webs constituting a connected article. A method for attaching an elastic band to an elastic band, the method comprising the steps of:

That is, a step of stretching a continuously moving elastic band and continuously or intermittently applying an adhesive thereto; A step of forming a composite elastic band by overlapping a continuously moving supporting tape having a width wider than the elastic band and nipping it with a first nip roll: The composite elastic band is placed on the surface of a rotary suction drum a step of continuously feeding the suction drum and cutting the suction drum with a cutter arranged to face the surface of the suction drum every time the suction drum rotates by a predetermined angle; A composite elastic band is intermittently fed and connected in the longitudinal direction of both sides of the web that is continuously fed to the circumferential surface of the roll, which is arranged such that the surface of the second nip roll faces the surface of the suction drum. structuring articles; forming the web into individual articles by cutting the web in the width direction of the web between the longitudinal ends of each of the composite elastic bands joined to the web; In a particularly preferred embodiment, the composite elastic band is cut to length on the surface of the rotary suction drum and at intervals to be joined intermittently to the web. .

The present invention is preferably directed to, but not limited to, disposable diapers.

(Structure and Embodiments of the Invention) In FIG. 1, a continuous elastic band 11 passes through a trough 1 to rolls 12, 13;
6 draft rolls 1 continuously fed to 6, 17
The circumferential speed of 4° 15 is higher than the draft roll 12.13, so that the elastic band 11 is stretched to a predetermined factor. An elastic hot-melt adhesive is continuously or intermittently applied to the elastic band 11 by the application means 18. On the other hand, the nip rolls 16 and 1.7 have a high degree of flexibility that does not inhibit the predetermined stretchability of the elastic band 11, and a width of 10 to 70 nwn, preferably 20 to 40 nwn.
A continuous support tape 19 made of a plastic film, non-woven fabric, etc. having a +n+ is continuously fed through a guide roll 20 while maintaining a predetermined tension. Therefore, at the nip rolls 16.17, the elastic band 1
1 is integrally joined to the support tape 19 in a stretched state.

To join the elastic band 11 to the support tape in this way,
This is mainly done to ensure that the suction drum described later can hold the elastic band reliably even if the width of the elastic band is relatively narrow. In the following description, the elastic band 11 and the support tape 19 thus joined will be described.
and is referred to as a composite elastic band 21. The composite elastic band 21 is continuously fed onto the circumference of the rotary suction drum 24 via tension rolls 22,23.

A rotary cutter 25 is disposed opposite to the surface of the suction drum 24 and operates in synchronization with the rotation of the drum by a predetermined angle. The circumferential speed of the suction drum 24 is higher than the feed speed of the composite elastic band 21 from the tension rolls 22,23. Therefore, the composite elastic band 21 is cut to a predetermined length on the surface of the suction drum 24, and a predetermined interval is created between the cut ends (this will be described in more detail later). The thus cut and spaced composite elastic band 21 is continuously fed via guide rolls 27, 28, 29 to a nip roll 26 which is disposed opposite to the surface of the suction drum 24 and has the same circumferential speed as the drum. The web 30 is intermittently joined with the adhesive applied to one elastic band 11 while maintaining the predetermined spacing. Although the composite elastic band 21 is joined to the web 30 in the longitudinal direction on both sides of the web (see FIGS. 5 and 11), in the following description, only the joining on the negative side will be discussed. do. The web 30 is a plastic film or the like that is to become a water-impermeable backsheet of the diaper, and is used in the assembly process 3.
It is fed while maintaining a predetermined tension to nip rolls 33 and 34 which are arranged opposite to each other and have the same circumferential speed as the suction drum 24 and nip roll 26. On the other hand, in the assembly step 32, a hot-melt adhesive is applied by means 36 to the continuous web 35 made of nonwoven fabric, etc., which is to become the water permeable top sheet of the diaper, to the absorbent body and/or the continuous web 3o of the diaper. It is applied and fed while maintaining a predetermined tension. On the other hand,
Go to assembly process 32.

Absorbent bodies 37 made in advance of defibrated pulp or the like are fed at predetermined intervals by a belt conveyor 38 having the same speed as the web 30.35. Therefore, in the assembly step 32, the absorbent bodies 37 are successively interposed between the webs 30.degree. 35 at predetermined intervals, and these are joined together. In this case, each absorbent body 37
Needless to say, the composite elastic bands 21 are fed so as to be aligned in a predetermined position with the composite elastic bands 21 bonded to both sides of the elastic bands 21. The diapers 39 constructed and connected in this way are fed to the next cutting process (not shown) by a belt conveyor 41, and are cut in the area 1II (see chain line 42 in FIG. 11) of the area 40 where each absorbent body 37 is not located. Cut into individual diapers. In this way, when cutting, the webs 30, 35 can be sealed to each other along their entire length, since no end of the elastic band 11 to be contracted is already located in the area 40. Such sealing can be achieved, for example, by heat sealing performed simultaneously with cutting, or by applying pressure to the application area.

Since the adhesive applied to the elastic band 11 is in contact with the circumferential surfaces of the nip roll 16 and the tension roll 23, measures are taken to prevent the adhesive from adhering to the circumferential surfaces, for example, to prevent the adhesive from adhering to the circumferential surfaces. Preferably, it is coated with a release agent film such as silicone.

Further, the rolls 22, 23 may be nip rolls. In addition, the rolls 16 and 23 must be cooling rolls in which cold water circulates.

It is preferable that the elastic band 11 is a plurality of thread-like rubber, each of which is thin and has weak elastic stress, but when such a plurality of thread-like rubber is used in the method of the present invention,
The draft roll 1.4, 15 and the nip roll 1.
6.17, each thread-like rubber is attached to the supporting tape 19.
For example, a roll having guide grooves for each thread-like rubber at a predetermined interval in the length direction of the circumferential surface between each pair of rolls. It is preferable that the In addition, when using a plurality of thread-like rubbers, each of the thread-like rubbers is temporarily joined so that they can be separated very easily, and the thread-like rubber is subjected to a stretching process, and a separation method is applied as appropriate. It is preferable to apply an adhesive after separating them in order to equalize the elongation rate of each rubber thread.

The above-mentioned preferred processing methods and means are disclosed in Japanese Patent Application Laid-Open No. 180601/1985 filed by the present applicant, and the contents of the disclosure may be helpful.
If necessary, I will refer to it here.

FIG. 2 shows the suction drum 24 and the manner in which the composite elastic band 21 is fed thereto. In this embodiment, the rotary suction drum 24 is formed of a porous peripheral wall, and receiving blades 44a, 44b, 44c, 4 for the cutting edge 43 of the rotary cutter 25 are provided at predetermined intervals on the surface of the peripheral wall.
4d, and has a fixed suction acting area 45 and a fixed non-suction acting area 46, which always maintain the fixed position shown in the figure, within the peripheral wall. The suction action area 45 is located at an appropriate position P in a direction opposite to the rotating direction of the suction drum 24 from the position of the cutter 25 where the composite elastic band 21 is cut, and the drum.

It is necessary that the surface of the nip roll 26 has a range between a nearby position P2 closest to the surface of the nip roll 26. Furthermore, as mentioned above, the circumferential speed of the suction drum 24 is set higher than the feed speed of the composite elastic band 21 from the tension roll 22, 23, and the acting force of the suction action area 45 is Even when the composite elastic band 21 is slipped on the surface of the action area 45, it is maintained to such an extent that it can be held and removed. The distance between the centers of the adjacent blades 44a, 44b, 411c, and 4'ld is longer than the predetermined length to which the composite elastic band 21 is to be cut.

Further, the suction drum 24 and the cutter 25 are controlled so that the cutting edge 43 and the receiving blades 44a, 44b, /14c, 44d are synchronously opposed to each other. Therefore, the composite elastic band 21 is cut at predetermined intervals on the surface of the suction action area 45 by the cutting edge 43 of the cutter 24, and the tip portion of the cut composite elastic band 21 is cut on the surface of the suction action area 45. The composite elastic band 21a moves while being held on the surface while slipping in a tensioned state against the resistance, and the composite elastic band 21a, which is cut and becomes independent, is fixedly held on the surface in a tensioned state by the action. As a result, a predetermined distance L% is generated between the tip of the cut composite elastic band 21 and the rear end of the cut and independent composite elastic band 2],a.

In FIGS. 3(A), (B), and (C), the predetermined interval L
This figure shows the process by which 1 occurs. That is, FIG. 3(A)
3 shows the state at the moment when the composite elastic band 21 is cut by the cutting edge 43 of the cutter 25 by the receiving blade 44a, and in FIG. 3 CB), the angular rotation of the suction drum 21 from the time of cutting is shown. , a state in which the distance L between the tip of the cut composite elastic band 21 and the rear end of the cut and independent composite elastic band 21a is opening to the predetermined distance L1, and the third Figure (C
), the receiver is the tip of the composite elastic band 21 cut by the blade 44a, and the composite elastic band 21 is cut into an independent composite elastic band 21.
This figure shows the state at the moment when the predetermined distance L1 from the rear end of the composite elastic band 21 is cut off by the cutting edge 43 of the cutter 25 at the four portions 44a. The composite elastic bands 21a are thus cut and separated and spaced apart.
are fed to the continuously moving web 30 from the tip of the band as it moves to the non-suction area 46, and are successively and intermittently joined by the adhesive applied to the elastic band 11 (fifth (see figure).

FIG. 4 shows still another aspect regarding the suction drum 24 and the feeding of the composite elastic band 21 thereto. In this embodiment, the feed speed of the composite elastic band 21 from the tension rolls 22 and 23 is made the same as the peripheral speed of the rotary suction drum 124. The suction drum 124 has a fixed suction action area 145 and a fixed non-suction action area 146, which is the same as the embodiment shown in FIG. It has a working area 50. Also, a non-suction acting area 50 receives the cutting edge 43 of the rotary cutter 25.
The distance between each cut and independent composite elastic band 21a is
The spacing is approximately equal to the interval at which the web 30 is intermittently joined to the web 30. Therefore, the tip portion of the composite elastic band 21 straddles the non-suction acting area 50 and the suction acting area 1.
The tip of the composite elastic band 21 that is fixedly held on the surface of the composite elastic band 21 and moved, and is cut, and the rear end of the composite elastic band 21a that is cut and is independent of the composite elastic band 21a.
When the adhesive is continuously applied to the elastic band 11 in (21a), the leading edge and the trailing edge (the leading edge and trailing edge of the elastic band 11 and the supporting tape 19) contract. When the elastic band 11 is separated by a distance approximately equivalent to the interval (see 141), and the adhesive is intermittently applied to the elastic band 11 and the elastic band 11 is cut in an area where no adhesive is applied, the elastic band 6. In FIGS. 5 to 10, the cut and independent composite elastic band 21a is attached to the web 30. Joined.

and three thin thread-like rubber 11 as the elastic band 11.
This shows the mode in which a is used. Each thread rubber
a are joined in parallel at predetermined intervals in the width direction of the support tape 19 with an elastic hot null 1 to type adhesive 47 applied to the entire circumference of the support tape 19.

Furthermore, in FIGS. 5 to 8, each thread-like rubber lla
The adhesive 47 is continuously applied over the entire length of the tape 1, and the cut ends 48 and the cut ends 49 of the support tape 19 are aligned and joined.

Furthermore, in FIGS. 9 and 10, the adhesive 47 is intermittently applied to each thread-like rubber Ila, and each thread-like rubber is cut at an adhesive-free area 51, so that the non-application area is supported. A state in which the tape 19 is being drawn in from the cut end 49 is shown.

Each of the thread-like rubber Ila has a cross-sectional area of 0.
03 to 0,6 mm, and the total cross-sectional area of the multiple pieces is 0.
12 to 2.7 m, with an elongation rate of 100 to 400%. Further, as the elastic hot-melt adhesive 47, a room temperature adhesive type is one of the preferable ones.

The adhesive 47 is cooled to the extent that it exhibits tackiness at room temperature in the process until the front composite elastic band 21 (21a) is nipped by the nip rolls 16, 17 and cut by the cutter 25. In particular, when the elastic band 11 is made of the plurality of rubber threads, the elongation stress of each one of them is weak. Therefore, the elastic band 1
1 maintains a state of being stably bonded to the support tape 19, and when cut together with the support tape by the cutter 25, there is no risk of shrinkage on the support tape or separation from the support tape. Further, at least in the process of moving the composite elastic band 21a joined to the web 30 to the nip roll 26, the adhesive 47 is crushed and spread on the support tape 19, so that the support tape is also Since it is in a state of being joined to the web 30, the state of being joined to the web is also stably maintained.

Although the above description has been made regarding disposable diapers, the method of the present invention can also be applied to other sanitary articles having a similar structure, such as disposable diaper covers, and is not limited to disposable diapers. Not done.

Example A disposable diaper was manufactured through the steps shown in FIGS. 1 and 2. In other words, the cross-sectional area of wires with a circular cross section and a diameter of 0.28+m+ that are fused together in parallel is 0.123 mm and the weight is 0.13 g/
Four pieces of rrtn natural filamentous rubber are rolled using a draft roll.
00% elongation to give each elongation stress of 30 g.

Bottle-melt type adhesive is continuously sprayed from a slot nozzle around the entire circumference of these rubber threads, and OAg/
(Coating (coating temperature 165'C)) After coating, these rubber threads were placed in the stretched state on a polyethylene film with a width of 30 mm obtained by a medium-low pressure method with a thickness of 7 μm, at intervals of 4 mm, and passed through a nip roll. A composite elastic band was obtained.This composite elastic band was subjected to a suction force of 15
00nwnAq・Suction action amount 4rn'/n+in
The composite elastic bands were continuously fed to a rotary suction drum maintained at 300 mm in length and sequentially cut into lengths of 300 ++ wu with a rotary cutter, and each of the cut composite elastic bands was cut into a polyethylene film having a thickness of 30 μm by a high pressure method of 94 Jc. The backsheet was intermittently fed to the backsheet, and the two were bonded together by nipping with nip rolls facing the drum. Thereafter, a diaper was obtained through the steps already described with reference to FIG.

However, it was found that the composite elastic band (thread-like rubber) was positioned in the diaper in an orderly and secure manner. Moreover, no trouble was observed in the step of cutting the composite elastic band on the suction drum and feeding it to the back sheet, and in the subsequent steps.

As the adhesive, Kaneboa N.C. Co., Ltd.
A product commercially available under the trade name "Durotac" and product number rMQ978 was used. This adhesive mainly consists of 30 parts by weight of elastomer, 60 parts by weight of adhesive resin, and 10 parts by weight of hardening agent, and has a resistance of 38,000 ± 7,000 at a temperature of 140°C.
17,000±3,0 at 0cps and temperature 1.606C
It is a room temperature adhesive type with physical properties of 0.00 cps.

[Brief explanation of drawings]

FIG. 1 is a side view showing an outline of the process of attaching an elastic band to a disposable diaper as an example of the method of the present invention. Figure 2 shows the dashed lines 2-, ? in Figure 1. FIG. 3 is a schematic enlarged side view of the surrounding portion showing the steps of cutting a composite elastic band and joining the band to a web; 3A, 3B, and 3C are schematic exploded side views of the continuous operation of the composite elastic band in FIG. 2; FIG. FIG. 4 shows a process corresponding to the process shown in FIG.
3 is a schematic side view of a rotary suction drum that is partially different from the rotary suction drum used in the process shown in FIG. 2. FIG. FIG. 5 is a partial plan view of the composite elastic band intermittently joined to the web. FIG. 6 is a partially enlarged plan view of FIG. 5. FIG. 7 is an enlarged cross-sectional view taken along the line 8-8 in FIG. FIG. 9 is a partially enlarged plan view showing a state in which the composite elastic band is joined to the web, which is different from the state shown in FIG. 6. FIG. 10 is a partial plan view of the connected diaper. 11... Elastic band, 12, 13, 14, 15...
Draft roll, 16,1.7...nip roll,
18... Application means, 19... Support tape, 21
...Composite elastic band, 24...Suction drum,
25...Cutter. 26... Nip roll, 30... Web, 32
... Assembly process, 33, 34... Nip roll, 35... Connected diaper, 45... Suction action area, 46... Non-suction action area, 47...
・Adhesive, 50...Non-suction area, 145...
・Suction action area, 146...Non-suction action area procedural amendment (method) March 19, 1981 Patent Application No. 229296 2, Title of invention Method for attaching elastic bands to sanitary articles 3, Person making the amendment Relationship with the case Percentage applicant 4, agent 5, date of amendment order February 11, 1980 (shipped to Japan in February of the same year) 6, number of inventions increased by amendment 7, subject of amendment The column for the brief explanation of the drawing in "Brief explanation of the drawing" will be corrected as follows. Between line 13 and line 14 on page 27 of the specification, “11th
The figure is a partial plan view of a connected diaper with elastic bands attached. ” to join.

Claims (10)

[Claims] (1) A method of attaching an elastic band to a sanitary article, in which stretched elastic bands are intermittently joined with adhesive at predetermined intervals on both sides of a continuously moving web that constitutes a connected article. , a method characterized in that it includes the following steps: a. stretching a continuously moving elastic band and continuously or intermittently applying an adhesive thereto; b. connecting the elastic band to the elastic pan 1; - has a degree of flexibility that does not impede the predetermined stretchability of the elastic band, and a width wider than the width of the elastic band, and is made of a composite elastic material by overlapping it with a continuously moving support tape and nipping it with a first nip roll. Step of configuring the band; C. The composite elastic band is continuously fed onto the surface of the suction drum every time the rotary suction drum rotates by a predetermined angle, and the composite elastic band is placed so as to face the surface of the suction tram. Cutting with a cutter; d Cutting the independent composite elastic band on the surface of the suction drum so as to continuously cut it on the circumferential surface of the roll, which is disposed so that the surface of the second nip roll faces the surface of the suction drum; a step of intermittently sequentially feeding and joining the web in the longitudinal direction on both sides of the web to form a connected article; and e. forming individual articles by cutting the web in the width direction. (2) the suction drum has a peripheral speed higher than the feed rate of the composite elastic band from the first nip roll and has a fixed suction action area; the composite elastic band is fed to the surface of the fixed suction action area, and each time the suction drum rotates by a predetermined angle, the fed composite elastic band is transferred to the fixed suction action area. cut with the cutter arranged to face the surface of the suction drum, and by the continuous rotation of the suction drum, the cut and independent composite elastic band is fixedly fixed on the surface of the fixed suction action area by the action. The distal end portion of the composite elastic band to be cut next is held and moved while being slipped against the action on the surface of the fixed suction action area. to create a predetermined distance between the rear end of the independent composite elastic band and the tip of the next composite elastic band to be cut, and by further rotation of the suction drum, the cut and independent composite elastic band An elastic band is attached to the sanitary article according to claim 1, wherein the band is moved away from the surface of the suction drum while moving to the fixed non-suction area, and is fed and bonded to the web at the predetermined intervals. How to install. (3) The suction drum has a peripheral speed that is the same as the feed speed of the composite elastic band from the first nip roll, and has a fixed suction action area, a first fixed non-suction action area, and a second fixed suction action area. 2 fixed non-suction action areas, and the composite elastic band is fed across the surface of the second fixed non-suction action area to the surface of the fixed suction action area, and each time the suction drum rotates a predetermined angle. Then, the fed composite elastic band is cut by a cutter arranged to face the surface of the second fixed non-suction acting area, so that the rear end of the cut and independent composite elastic band and the next The leading end of the composite elastic band to be cut is contracted to create a predetermined distance between the two ends, and by the continued rotation of the suction drum, the cut and independent composite elastic band is brought into contact with the first fixed non-suction action. The method of attaching an elastic band to a sanitary article according to claim 1, wherein the elastic band is moved away from the surface of the suction drum while being moved across the area, and is fed and bonded to the web at the predetermined intervals. (4) The surface of the first nip roll that comes into contact with the adhesive applied to the elastic band is coated with a release agent film that prevents the adhesive from adhering to the surface of the first nip roll. How to attach elastic bands to sanitary articles. (5) The sanitary article according to claim 1, wherein the composite elastic band is fed to the surface of the suction drum with the elastic band on the outside so that the elastic band does not contact the surface of the suction drum. How to attach the band. (6) The method of attaching an elastic band to a sanitary article according to claim 1, wherein the cut and independent composite elastic band is joined to the web using an adhesive applied to the elastic band. (7) The cross-sectional area of one elastic band is 0.03~
0.6wn, and a total cross-sectional area of 0.12 to 2.7 mm, are stretched by 100 to 400% and are arranged in parallel at a predetermined interval in the width direction of the support tape.
A method of attaching an elastic band to a sanitary article according to claim 1. (8) The supporting tape is a plastic film or a nonwoven fabric having a width of 10 to 70 mm.
Method of attaching elastic bands to sanitary articles as described in Section 1. (9) A method for attaching elongated elastic bands at predetermined intervals in the longitudinal direction on both sides of a web constituting a continuously moving connected diaper, the method comprising the following steps: (a ) stretching a continuously moving elastic band and applying an adhesive continuously or intermittently; (c) forming a composite elastic band by overlapping a continuously moving support tape having flexibility and a width wider than the elastic band and nipping it with a first nip roll; (c) forming a composite elastic band; (d) a step of continuously feeding the suction drum onto the surface of the rotary suction drum, and cutting the suction drum with a cutter arranged to face the surface of the suction drum every time the suction drum rotates by a predetermined angle; Both sides of the first web are continuously moved to the surface of the second nip roll, which is arranged so that the surface of the second nip roll faces the surface of the prepacking suction drum, and the composite elastic band is cut on the surface of the drum and becomes independent. (e) feeding the first web and the other second web to an assembly process; (f) joining the first web and the second web; Each preformed absorbent body is fed at a predetermined interval between the first and second absorbers. (g) a step of integrally joining the second web and the absorbent body to form a connected diaper; and (g) the first step. A second web is attached between the longitudinal ends of each of the composite elastic bands joined to the first web. Step 2: Cutting the web in the width direction to form individual diapers. (10) Said 1. One of the second webs is a water-impermeable backseed; An elastic band is attached to the disposable diaper according to claim 9, wherein the other side of the second web is a water-permeable top sheet.