JPH07205375A - Production of strenchable composite - Google Patents

Abstract

PURPOSE:To obtain a stretchable composite not requiring the restriction of a base material, not becoming bulky and not lowering processing speed by bonding an elastomer film and a base material whose stretchability is lower than that of the film by the adhesive applied to the base material in a linear or spot like state so as to provide intervals in both directions in such a state that the film is stretched in its MD and TD directions to take up the obtained composite while holding the film to a stretched state. CONSTITUTION:Base materials B coated with a hot-melt adhesive A in a linear or spot like state are bonded to both surfaces of an elastomer film E held to a stretched state. From the coating form of the adhesive A, the film E and the base materials B are bonded in the linear or spot like state. The base materials B to which the adhesive A is applied in the linear or spot like state so as to leave an interval are bonded to both surfaces of the film E held to a stretched state. A composite 14 is taken up by a stretchable composite take-up part 5 through stretchable composite supply nip rolls 8 in such a state the film E is held to a stretched state but, when the stretched state of the composite 14 is released, since the adhesive A is applied to the base materials B in a linear or spot like state, a bellows like stretchable composite 15 wherein the base materials B show a dome shape is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a stretchable composite, which has various functions such as stretchability, and therefore, in particular,
The present invention relates to a method for producing a stretchable composite body that can be suitably used for gathering hats in helmets, arm bands, bandages, diapers, and various other applications.

[0002]

2. Description of the Related Art In order to adapt to the above-mentioned uses, a combination of an elastic member made of a net-like or filament-like material and a base material made of a plastic film is used for the above-mentioned uses. In addition, various innovations have been made. U.S. Pat. No. 3,694,815 discloses a method of making such composites by immobilizing a stretched elastic member to a substrate and then removing the immobilizing means from the elastic member to shrink the substrate. It is disclosed. However, in the method of this U.S. Patent, an elastic ribbon is passed between two nip rolls having different peripheral speeds to be stretched while changing the speed ratio thereof, and is then passed through a freezing tank containing a mixture of dry ice and ethanol to be frozen. Then, the stretched ribbon is held in the stretched state, and then fixed by stitching or adhering to the base material, and thereafter, as described above, the means for immobilizing the elastic member is removed, It is a manufacturing method of shrinking the base material, and because it is a method of passing the stretched ribbon through a freezing tank to freeze and hold the stretched state, it becomes a large scale in terms of equipment such as temperature control, and there is also a problem in workability. There is.

On the other hand, an elastic member that is not stretched is discontinuously bonded in the width direction to a base material that is less stretchable than the elastic member to form a composite, and the composite is expanded in the width direction. However, a method for producing a bellows-like elastic composite by relaxing the composite is then proposed (Japanese Patent Laid-Open No. 59-59).
901 publication). However, in this method, the elastic member and the base material are discontinuously bonded and then expanded, and the base material can also be expanded for expansion after the connection. There is a problem that the base material is specified.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a technique capable of solving the drawbacks of the conventional technique.

[0005]

SUMMARY OF THE INVENTION The present invention provides at least one surface of an elastomer film and a substrate having a lower extensibility than the elastomer film in a state where the elastomer film is stretched in the MD and / or TD directions. ,
The present invention relates to a method for producing a stretchable composite, characterized in that the elastomeric film is adhered in a linear or dot shape at appropriate intervals in the TD direction and / or the MD direction, and is wound in an expanded state of the elastomer film.

The elastomer film used in the present invention means a film which exhibits rubber-like elasticity at around room temperature. As the elastomer film, various kinds of elastomer films such as natural rubber or synthetic rubber elastomer film can be used. Next, preferred examples for use in the present invention will be given.

(A) An elastomer film obtained by film-forming by an air-cooled inflation method using a composition for an elastomer film comprising a composition containing an ethylene / α-olefin copolymer rubber and an ethylene copolymer. The film composed of the composition for an elastomer film is preferable for the purpose because of its stretchability, thin film formation, low temperature shrinkability and printability. Rubber component ethylene / α-
Examples of the olefin copolymer rubber include ethylene, α-olefin, and a copolymer containing a non-conjugated diene as necessary. Examples of the α-olefin include propylene having 3 to 12 carbon atoms, butene-1, pentene-1, hexene-1,
4-methylpentene-1 and octene-1 can be mentioned, and among these, propylene and butene-1 are preferable. In addition, other α-olefins may be contained within a range that does not impair the characteristics of the copolymer. Further, the α-olefin may include two or more kinds. Non-conjugated dienes used as the third component include 1,3-cyclopentadiene, dicyclopentadiene, tricyclopentadiene, 5-methyl-2,5-norbornadiene, 5-methylene-2-norbornene, 5-ethylidene-2. -Norbornene, 5-isopropylidene-2-norbornene, 5
-Isopropenyl-2-norbornene, 5- (1-butenyl) -2-norbornene, 5-vinyl-norbornene, cyclooctadiene, vinylcyclohexene, 1,
5,9-Cyclododecatriene, tetrahydroindene, 6-methyl-4,7,8,9-tetrahydroindene, trans-1,2-divinylcyclobutane, 1,4
-Hexadiene, 2-methyl-1,4-hexadiene,
1,6-octadiene, 1,7-octadiene, 1,8
-Nonadiene, 1,9-decadiene, 3,6-dimethyl-1,7-octadiene, 4,5-dimethyl-1,7-
There are octadiene, 1,4,7-octatriene, 5-methyl-1,8-nonadiene and the like, but preferably 5-
They are ethylidene-2-norbornene, dicyclopentadiene and 1,4-hexadiene. Among the ethylene / α-olefin copolymer rubbers, ethylene / propylene / diene copolymer rubbers, ethylene / propylene copolymer rubbers, and ethylene / butene-1 copolymer rubbers are preferable for the purpose of the present invention. The ethylene / α-olefin copolymer rubber has an ethylene content of 40 to 80% by weight,
It is preferable that the content of the α-olefin is 20 to 60% by weight, and the content of the non-conjugated diene used as necessary is 0 to 7% by weight. A more preferable range is 50 to 75% by weight of ethylene, 25 to 50% by weight of α-olefin, and 0 to 5% by weight of non-conjugated diene. The ethylene / α-olefin copolymer rubber preferably has a Mooney viscosity (ML _{1 + 4} 100 ° C.) of 10 to 200. A more preferable range is 50 to 150. The density is preferably 0.89 g / cm ³ or less. Examples of the ethylene-based copolymer include ethylene-vinyl acetate copolymer (EVA). The vinyl acetate content of the EVA is preferably 5 to 30% by weight. The blending ratio of the ethylene / α-olefin copolymer rubber in the composition for an elastomer film is preferably 30 to 70% by weight, more preferably 50 to 60% by weight. When the blending ratio of the ethylene / α-olefin copolymer rubber is lower than 30% by weight, the elasticity of the obtained elastomer film is lowered. On the other hand, when it exceeds 70% by weight, workability and adhesiveness are deteriorated. The mixing ratio of the ethylene-based copolymer is preferably 70 to 30% by weight, more preferably 50 to 40% by weight. The reason for limiting the blending ratio of the ethylene-based copolymer is exactly opposite to the reason for limiting the EPDM rubber component, and if it is less than 30% by weight, processability,
If the adhesiveness is reduced, and if it is higher than 70% by weight, the elasticity as an elastomer film becomes insufficient. The elastomer film composition includes polyethylene resin such as low density polyethylene (LDPE), linear low density polyethylene (LLDPE), and high density polyethylene HDPE).
Polyethylene resin such as can be added. By adding a polyethylene resin, its blocking resistance and moldability can be improved. The polyethylene resin preferably has a density of 0.945 g / cm ³ or less, and a melt index of 0.1 to 20 g / 10.
Minutes (190 ° C., 2.16 kg load) are preferable.
When the polyethylene resin is added, the addition amount is
1 based on the weight of the above composition (100 parts by weight)
The amount is preferably ˜40 parts by weight, and particularly preferably 5 to 30 parts by weight. The amount of polyethylene resin added is preferably set so that the melt index of the composition containing polyethylene resin is 0.5 to 20 g / 10 minutes. If the amount of polyethylene resin added is less than 1 part by weight,
It is not effective in improving blocking resistance and workability.
When it exceeds 0 part by weight, the stretchability and melt adhesiveness of the resulting composition are deteriorated. Blocking resistance and heat resistance can be improved by adding a powdery inorganic filler to the above-mentioned elastomer film composition. As the inorganic filler, talc, calcium carbonate, gypsum, carbon black, clay, kaolin, silica, diatomaceous earth, magnesium carbonate, barium carbonate, magnesium sulfate, barium sulfate, calcium sulfate, calcium phosphate, aluminum hydroxide, oxidation. Zinc, magnesium hydroxide, calcium oxide, magnesium oxide, titanium oxide, alumina, mica, silas balun, zeolite, silicate clay, cement, silica fume, mica powder and the like can be used, but talc, titanium oxide, Calcium carbonate, silica and the like are particularly preferable. The average particle size of the inorganic filler is 5 μm or less, preferably 1 to 3 μm. These powdery inorganic fillers can be used alone or in combination. The powdered inorganic filler is preferably added in an amount of 2 to 15 parts by weight based on the weight of the composition (100 parts by weight). If it is less than 2 parts by weight, the effect of adding the powdered inorganic filler may not be remarkable, and if it exceeds 15 parts by weight, the strength of the obtained composition may be rather lowered. However, since the film-forming property and the stretch processability of the composition obtained by adding the inorganic filler are lowered, the amount of the inorganic filler is
It is preferable to appropriately select within the above range depending on the use of the elastomer film. In addition to the above-mentioned additives, a heat stabilizer, an ultraviolet absorber, an antistatic agent, an antioxidant, a coloring agent, etc. can be appropriately blended. Explaining an example of the production method of the elastomer film, for example, EVA70 having 30 to 70% by weight of EPDM and 5 to 30% by weight of vinyl acetate content is used.
-30% by weight, and further, a composition prepared by appropriately mixing this composition with a polyethylene resin is kneaded at a temperature of 160 ° C or lower,
Blow-up ratio of 2.0- by air cooling inflation method
It can be obtained by forming a film with 5.0. A method for manufacturing such a film is disclosed in Japanese Patent Laid-Open No. 3-128.
The method disclosed in Japanese Patent No. 945 can be applied. In particular, by forming a film by the air-cooled inflation method as described above, M
D (Machine Direction, vertical direction),
TD (Transverse Direction, lateral direction) It is possible to form an elastomer film having less strain in both directions and good stretchability, and also having excellent thermal stability and less resin odor.

(B) 60 to 80% by weight of a thermoplastic polyurethane resin having a softening temperature of 170 to 190 ° C. and a Shore A hardness of 70 to 88 degrees, 10 to 30% by weight of ethylene-propylene-diene copolymer rubber and low density polyethylene. An elastomer film comprising an elastomer film composition containing 10 to 30% by weight of a resin. Examples of the thermoplastic polyurethane resin include polyester-based, adipate-based, polyether-based, polycaprolactone-based polyurethane elastomers and the like. Of these, polyester-based polyurethane elastomers are preferred for the purposes desired by the present invention. It is desirable that such a thermoplastic polyurethane elastomer has a softening temperature of 170 to 190 ° C. and a Shore A hardness (JIS A hardness) of 70 to 88. If the softening temperature is less than 170 ° C., the inflation tube is likely to be blocked during film formation, and it will be difficult to separate the two tubes after slitting both ears. On the other hand, when the softening temperature exceeds 190 ° C., the stretch flexibility and the ultrasonic adhesive force become poor. Also, Shore A
When the hardness is less than 70, the inflation tube tends to be blocked during film formation, and it becomes difficult to peel it off into two sheets after slitting both ears. On the other hand, when the Shore A hardness exceeds 88, the stretch flexibility and ultrasonic adhesive strength of the film become poor. Examples of the ethylene-propylene-diene copolymer rubber include copolymers containing the same ethylene, propylene and diene compounds as described above. This ethylene-propylene-diene copolymer rubber (EPDM) has an ethylene content of 60 to 70 mol%, a propylene content of 30 to 40 mol%, and a diene compound content of 1 to 10 mol%. Preferably there is. A more preferable range is 62 to 66 mol% for ethylene, 33 to 37 mol% for propylene, and 3 to 6 mol% for a diene compound. The ethylene-propylene-diene copolymer rubber preferably has a number average molecular weight of 400,000 to 600,000 and a density of 0.87 g / cm ³ or less.
Furthermore, the melt index (190 ° C., 2.16 kg load) of the ethylene-propylene-diene copolymer rubber is preferably in the range of 0.1 to 12.0 g / 10 minutes, more preferably 0.3 to 5 It is 0.0 g / 10 minutes.
Examples of the low-density polyethylene-based resin include homopolymers of ethylene by the same high-pressure method as described above, or copolymers of ethylene as a main component with 20% by weight or less of a vinyl-based compound and the like, for example, ethylene-vinyl acetate copolymer, ethylene- Examples thereof include ethyl acrylate copolymer. It may be linear low density polyethylene. The density of the low-density polyethylene resin is preferably 0.935 g / cm ³ or less, and the melt index (MI, 190 ° C., load 2,16)
Those having a weight of 0.05 to 20 g / 10 minutes are preferable.
Further, in the case of a copolymer such as an ethylene-vinyl acetate copolymer, the vinyl acetate content is preferably 5 to 25% by weight, more preferably 5 to 15% by weight, and the melt index (MI, 190 ° C., Load 2,16 kg) is 0.1
~ 20g / 10 minutes is preferred, more preferably 1-5g
/ 10 minutes. If the thermoplastic polyurethane resin having a softening temperature of 170 to 190 ° C. and a Shore A hardness of 70 to 88 is less than 60% by weight, the properties of the polyurethane elastomer will be lost, the texture will be poor, and the abrasion resistance which is a property of polyurethane. And the mechanical strength is reduced. On the other hand, 80
When the content is more than the weight%, the inflation tube is likely to be blocked and it becomes difficult to peel it off into two pieces after slitting both ears. 1 ethylene-propylene-diene copolymer rubber
If it is less than 0% by weight, the stability in film formation of the film becomes insufficient. On the other hand, when it exceeds 30% by weight, the stretchability of the film, the ultrasonic adhesiveness, the rubber elasticity (the hysteresis strain after 100% stretch is large) and the like are deteriorated. If the compounding ratio of the low density polyethylene resin is less than 10% by weight,
The inflation tube is easily blocked, and it becomes difficult to peel it off into two pieces after slitting both ears. On the other hand, when it is 30% by weight or more, the product film is inferior in stretch flexibility, melt adhesion, rubber elasticity (large hysteresis strain after 100% stretch) and the like. To the above-mentioned composition for a thermoplastic elastomer film, a powdery inorganic filler or the like as exemplified above can be added. The composition is added with the above-mentioned respective constituent components and other components as necessary, and after dry blending in advance using, for example, a Hensiel mixer or a high speed mixer, it is heated, for example, at 180 to 220 ° C.
It can be obtained by melt-kneading and extruding into pellets using an extruder or the like. The method for producing a film from the composition can be formed as a flat film by a T-die extruder, which is a known method for forming a polyolefin film, but it can be formed in a later stretching step and a high-speed formability in a thin film ( In consideration of (improvement in productivity) and the like, the air-cooled inflation method in which a tube-shaped film is formed by the inflation method is preferable. In the inflation molding method using the air cooling method, the resin temperature is 18
It is preferable to carry out at a blow ratio in the range of 2.0 to 5.0 at 0 to 220 ° C.

The thickness of the elastomer film is usually 10 to 200 μm, preferably 50 to 150 μm. When the film thickness is less than 10 μm, the adhesive strength with a polypropylene nonwoven fabric or the like is poor. On the other hand, when it exceeds 200 μm, the feel of the film becomes hard and the texture is poor.

Examples of the substrate used in the present invention include a non-woven fabric having a lower extensibility than the elastomer film,
Examples thereof include paper, plastic film, woven fabric, metal foil and the like. Examples of plastic film on the base material are:
Examples include polyolefin films such as polypropylene and polyethylene. The base material can be appropriately selected according to the application of the elastic composite of the present invention, and the base material is not required to have elasticity.

Next, the details of the manufacturing method of the present invention will be described together with preferred embodiments with reference to the drawings as appropriate. FIG. 1 is an explanatory diagram showing an embodiment of the stretchable composite body manufacturing apparatus of the present invention. Further, FIG. 2 shows an example explanatory diagram of an embodiment process of the present invention. In these figures, 1 is an elastomer film feeding part, 2 is a base material feeding part, 3 is an adhesive coating device, 4 is a film stretching / base material bonding part, and 5 is a stretchable composite winding part. In the figure, 6 is a roll, 7 is a nip roll for supplying an elastomer film, and 8 is a nip roll for supplying a composite.

As shown in FIG. 1, the elastomer film E is fed from the elastomer film feeding portion 1,
The film is stretched and supplied to the base material adhesive portion 4. On the other hand, the base material B is fed from the base material feeding portion 2,
An adhesive is applied from the adhesive applying device 3 to the adhesive surface of the elastomer film E. An example of the adhesive application device 3 includes an applicator 9 and an application gun 10 connected to the applicator 9. The applicator 9 contains, for example, a hot melt adhesive. As shown in the drawing, the base material B is respectively fed from both the upper and lower base material feeding portions 2, and the adhesive is applied from one side of each base material B by the adhesive applying device 3. Examples of hot melt adhesives include thermoplastic rubber hot melt adhesives based on block copolymers of polystyrene and polybutadiene or polyisoprene, ethylene-vinyl acetate based on copolymers of ethylene and vinyl acetate. Examples of the hot-melt adhesives include polyamide-based hot-melt adhesives based on polyamide. As shown in FIG.
The state of applying the hot melt adhesive A after 0 is shown.
The hot melt adhesive A is applied linearly or in dots.

The elastomer film E fed from the elastomer film feeding section 1 and supplied to the film stretching / base material bonding section 4 is stretched by the film stretching / base material bonding section 4. The film stretching / base material adhesion portion 4 is
As shown in FIG. 2, the rod-shaped belt 11A for stretching the elastomer film, the receiving belt 11B for stretching the elastomer film having a recess, and the belt pressing plate 12 are provided. Further, as shown in FIG. 2, when the upper circular belt 11A is pressed from above by the belt pressing plate 12 located on the upper part, the elastomer film E is pressed into the recess of the receiving belt 11B, It is stretched in the lateral direction (TD) with respect to the MD direction (longitudinal direction). The elastomeric film stretching rod-shaped belt 11A, the recessed elastomeric film stretching receiving belt 11B, and the belt pressing plate 12 move in the MD direction by belt drive as illustrated. The elastomer film E moves inside the film stretching / base material adhesive portion 4 while being stretched by these. In the stretched state of the elastomer film E, each base material B coated with the hot-melt adhesive A in a linear or dot-like manner as described above is adhered to both sides of the elastomer film E. This bonding can be performed by pressing with a bonding nip roll 13 as shown in FIG. From the application form of the hot melt adhesive A,
The elastomer film E and the base material B are adhered in a linear or dot shape. Next, in order to further explain the extension and adhesion according to FIG. 4, the elastomer film E is extended from the state of FIG. 4A as shown in FIG. Each base material B coated with the hot melt adhesive A is adhered to both sides of the elastomer film E. As shown in FIG. 2, the composite body 14 is wound around the stretchable composite material winding portion 5 through the stretchable composite material supply nip roll 8 in a state where the elastomer film E is stretched. As shown in (C), the complex 14
When the stretched state is released, the base material B is coated with the hot-melt adhesive A in a linear or dot shape, so that the base material B is a dome-shaped bellows-shaped stretchable composite 15. To be FIG. 5 shows the obtained bellows-shaped stretchable composite body 1.
5 shows a perspective view of FIG. The magnification at which the elastomer film E is stretched can be appropriately selected depending on various uses, but is usually preferably 1.5 to 3 times. The stretching is performed at room temperature, but may be performed at a heating temperature of 60 ° C. or lower, preferably 50 ° C. or lower. If the magnification is less than 1.5 times,
The elastomeric film in the stretchable composite has a hard feel, the texture of the stretchable composite is poor, and the stretchability is excellent.
It is difficult to obtain a product having a small residual expansion and contraction, and when it exceeds 3 times, problems occur such as whitening of the elastomer film and poor adhesion. The interval between the hot-melt adhesives A applied in the linear or dot form in the stretchable composite 15, that is, the bead interval (T) of the dome-shaped base material B is derived according to the following equation. T = interval during application (P) / stretch ratio of elastomer film Therefore, the interval (P) during application is, for example, 10 mm,
When the hot melt adhesive A is applied linearly or in dots and the stretched state of the composite film 14 wound in the stretched state of the elastomer film is released, the finish interval (T) becomes 5 mm. . From the relationship with the above equation, the finishing interval (T) can be freely changed by changing the expansion ratio of the elastomer film E. Therefore, even if the same elastomer film E is used, the expansion ratio can be appropriately selected. It is possible to obtain various stretchable composites having different hysteresis curves.

According to the above example, a conventional unstretched elastic member is discontinuously bonded to a substrate that is less stretchable than the elastic member to form a composite and the composite is stretched. In the method of obtaining an elastic composite by relaxing the composite after that, the base material can be stretched because it is stretched after bonding, but in the present invention, first, the elastomer film is stretched. To keep
The base material may be one having elongation or less elongation, and therefore, the base material is not limited to be stretchable. Further, since the stretchable composite is wound in the stretched state, it does not become bulky. When used as a member of a diaper or the like, there is no need to further extend it in the TD direction or the MD direction, and since it is gathered when released in the free state, it can be smoothly introduced into the processing process as it is and the processing speed is not reduced.

In the above description, the hot-melt adhesive is applied as a preferable example by applying it in a linear or dot-like manner. However, depending on the method of heat sealing, the dry laminating method, or the base material, the wetting may be performed. A laminating method or the like may be used. For example, in a state where the elastomer film E is stretched, a substrate is overlaid on the elastomer film, and the heat seal roll 16 having irregularities as shown in FIG. Adhere in a line or dot shape at intervals.
The stretchable composite may be wound in the stretched state of the elastomer film. Further, in the above, a method has been described in which the elastomer film E is stretched in the TD direction, the elastomer film and the substrate are adhered linearly or in a dot shape, and the elastomer film is wound in the stretched state. It may be stretched in the MD direction or may be stretched in the TD and / or MD direction. Furthermore,
The adhesive may be applied in the MD direction as in the above embodiment as long as it is adhered linearly or in dots at appropriate intervals, or in the TD direction or, for example, in the form of stitches. , TD direction and / or MD direction may be made to adhere | attach at appropriate intervals, and may be made to adhere | attach it linearly or in a dot shape.

[0016]

EXAMPLES Next, examples of the present invention will be shown. In addition, the measuring method of the physical-property value in an Example is as follows. (1) 50% elongation strength (g); JIS-L1096 (2) 100% elongation strength (g); JIS-L1096 (3) 100% elongation 2 cycle strain (%); JIS-
L1096

Embodiment 1. Ethylene-propylene-diene copolymer rubber (Exxon Chemical Co., trade name V3708)
An elastomer film composition containing 60% by weight and 40% by weight of an ethylene-vinyl acetate copolymer (manufactured by Nippon Unicar Co., Ltd., trade name DQDJ-3269).
Elastomer film with μm thickness (blow-up ratio 5.
An air-cooled inflation film of 0 (hereinafter referred to as film A) is stretched at a stretching ratio of 2 by the apparatus shown in FIGS. 1 and 2. Using two Nordson Equibead guns designed with a spacing (P) of 10 mm during coating,
Nippon Fuller hot melt adhesive (trade name JHL-
105-16C) is linearly applied to each of two non-woven fabrics (polypropylene spun-bonded non-woven fabric product name P3020 manufactured by Asahi Kasei Corp.) and supplied to both surfaces of the elastomer film stretched to the above-mentioned extension ratio of 2 times. The non-woven fabric does not stretch in the TD and MD directions. These are pressed with a nip roll, and the two nonwoven fabrics are adhered with the elastomer film stretched. With the elastomer film stretched, the composite is wound. The processing speed was 20 m / min. When the composite was pulled out from the stretchable composite winding portion, a gathered composite in which the elastomer film portion was contracted was obtained. The physical properties of the complex were measured. The results are shown in Table 1.

Example 2. A composite was obtained in the same manner as in Example 1 except that the stretch ratio of the elastomer film was set to 3. The physical properties of the complex were measured. The results are shown in Table 1.

Example 3. A composite was obtained in the same manner as in Example 1 except that the thickness of the elastomer film was 20 μm. The physical properties of the complex were measured. The results are shown in Table 1.

Example 4. Softening temperature 180 ℃, Shore A
60 parts by weight of a thermoplastic polyurethane resin having a hardness of 85 (trade name: Rezamin P327 manufactured by Dainichi Seika Kogyo Co., Ltd.), 20 parts by weight of the ethylene-propylene-diene copolymer rubber used in Example 1, and a linear low density polyethylene (Japan A 25 μm-thick elastomer film (an air-cooled inflation film with a blow-up ratio of 5.0) (hereinafter referred to as film B) made of a composition for an elastomer film kneaded with 20 parts by weight of Unicar Co., Ltd., NUC8506) A composite was obtained in the same manner as in Example 1. The physical properties of the complex were measured. The results are shown in Table 1.
Shown in.

Comparative Example 1. In Example 1, the same hot melt adhesive was linearly applied to each of the two nonwoven fabrics used in Example 1 in the same manner without stretching the elastomer film, and the composite was adhered. Although it was attempted to measure the physical properties by performing 50% elongation and the like in the same manner as above, the nonwoven fabric was broken and the physical properties could not be measured. The results are shown in Table 1.

[0022]

[Table 1]

[0023]

As described above, the present invention has the following advantages. (1) A conventional non-stretched elastic member is discontinuously bonded to a substrate having lower stretchability than the elastic member to form a composite, the composite is stretched, and then the composite is relaxed. In the method of obtaining the elastic composite by carrying out the above, there is a limitation that the base material can also be stretched for the purpose of stretching after adhesion. On the other hand, according to the present invention, it is not necessary to limit the substrate. (2) In the present invention, the stretchable composite does not become bulky because it is wound in the stretched state. (3) In the present invention, when used as a member of a diaper,
It is not necessary to further extend in the TD direction or the MD direction, and since it is gathered when released in the free state, it can be smoothly introduced into the machining process as it is and the machining speed is not reduced.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of a stretchable composite body manufacturing apparatus of the present invention,

FIG. 2A is an explanatory view of an example of a process of an embodiment of the present invention,
(B) is a drawing for explaining the stretching process of the elastomer film in the M portion of FIG. (A), (C) is a drawing for explaining the stretching process of the elastomer film in the N portion of FIG.

FIG. 3 is an explanatory view of an adhesive applying step in the embodiment of the present invention,

FIG. 4A is an explanatory view of an elastomer film before stretching in an example step of the present invention, FIG. 4B is an explanatory diagram after stretching an elastomer film in an example step of the present invention, and FIG.

FIG. 5 is a structural diagram of a composite body showing an embodiment of the present invention,

FIG. 6 is a configuration diagram showing another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Elastomer film feeding part 2 ... Base material feeding part 3 ... Adhesive coating device 4 ... Film extension / base material bonding part 5 ... Composite winding part 6 ... Roll 7・ ・ ・ Elastomer film supply nip roll 8 ・ ・ ・ Composite supply nip roll 9 ・ ・ ・ Applicator 10 ・ ・ ・ Applying gun 11A ・ ・ ・ Elastomer film stretching rod belt 11B ・ ・ ・ Elastomer film stretching with depressions Receiving belt 12 ... Belt pressing plate 13 ... Adhesive nip roll 14 ... Composite 15 ... Stretchable composite 16 ... Heat seal roll having irregularities A ... Hot melt adhesive B. ..Substrate E ... Elastomer film T ... Bead spacing P ... Spacing between hot melt adhesives A

Claims (3)

[Claims] 1. An elastomer film is MD and / or T
In a state of being stretched in the D direction, at least one surface of the elastomer film and a base material having a lower stretchability than the elastomer film are linearly or dot-shaped at appropriate intervals in the TD direction and / or the MD direction. A method for producing a stretchable composite, which comprises adhering to an elastomer film and winding the elastomer film in a stretched state. 2. The elastomer film according to claim 1, wherein the ethylene / α-olefin copolymer rubber 30 to 70 is used.
The method for producing a stretchable composite according to claim 1, characterized in that it comprises a composition containing 70% by weight of ethylene copolymer and 70% by weight of ethylene copolymer. 3. The elastomer film according to claim 1, wherein the thermoplastic polyurethane resin is 60 to 80% by weight, the ethylene-propylene-diene copolymer rubber is 10 to 30% by weight, and the low density polyethylene resin is 10 to 30% by weight. A composition comprising:
The method for producing a stretchable composite according to.