HK1016931B - Packing material, base material of adhesive tape, or separator - Google Patents

Description

Packaging material, base material for adhesive tape, or separator

Technical Field

The present invention relates to a packaging material for packaging sanitary articles such as sanitary napkins or disposable diapers, and more particularly to a packaging material for individually packaging sanitary napkins. In addition, the adhesive tape is used as a base material for adhesive tapes for medical use, surface protection, and the like. It is also suitable for use as a separator for adhesive articles such as adhesive sheets, (double-sided) adhesive tapes, adhesives and the like, disposable articles such as paper diapers, sanitary napkins and the like.

Background

Conventionally, a separator used for protecting an adhesive layer in a disposable article such as a sanitary napkin or a disposable diaper, or a packaging material for a sanitary product such as a sanitary napkin, has been proposed as a release tape or a packaging material having a release agent layer on a support made of a flexible plastic film.

However, when a conventional packaging material having a peeling function, for example, a sanitary napkin having an adhesive layer for preventing slipping, which is used for attachment to underwear, is directly packaged with such a conventional packaging material, if the packaging material is sealed by pressing or heat-sealing, the sealing process (adhesive process) cannot be performed when both surfaces of the adhesive surface are coated with a peeling agent (surface of the release agent layer) to each other.

In addition, in order to bond a packaging material having a peeling function by a pressure method or a heat-sealing method, a packaging material has been proposed in which a peeling agent is applied only to a portion in contact with an adhesive portion of a sanitary napkin and a peeling agent is not applied to a sealed portion. However, this has a problem of high cost in view of complexity of the production process and product yield.

Disclosure of Invention

The present inventors have made extensive studies to solve the above problems, and as a result, have found that a release agent layer which is discontinuous is formed on the surface of a film-like carrier so that a part of the carrier is exposed, and that even when the release agent layer is stacked between both surfaces and sealed by a pressure method or a heat sealing method, a packaging material which can solve the above problems and is extremely practical can be provided. Thus, the purpose of the invention is achieved.

That is, the present invention relates to a packaging material, a base material for an adhesive tape, or a separator, which is characterized in that a discontinuous release agent layer is formed on at least one surface of a film-like support so that a part of the support is exposed.

The present invention also relates to a packaging material, a base material for an adhesive tape, or a separator, wherein the release agent layer has a crack at least on one surface of the film-like support, and the support surface as the base material is exposed from the crack.

The present invention also relates to a structure of a seal portion formed by heat-sealing both superposed surfaces of a release agent layer having a cracked portion such as the above packaging material.

Brief description of the drawings

FIG. 1 is a sectional view showing an example of the packaging material of the present invention.

FIG. 2 is a sectional view showing an example of the packaging material of the present invention.

FIG. 3 is a schematic view showing the use of the packaging material of the present invention in the packaging of sanitary napkins.

FIG. 4 is an enlarged plan view showing the shape of a release agent layer after a stretching treatment of the release agent layer of a packaging material or the like of the present invention.

FIG. 5 is a schematic view of a sample for measuring the seal strength of the packaging material of the present invention.

Best Mode for Carrying Out The Invention

The present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a sectional view showing an example of the packaging material of the present invention. A carrier 1 made of a thermoplastic plastic film has a discontinuous release agent layer 2 on one surface thereof so that a part of the carrier is exposed.

In the present invention, the release agent layer formed on at least one surface of the film-like carrier may be discontinuous to expose a part of the carrier, and the meaning is as follows.

That is, the above meaning in the present invention means a release agent layer that is obtained by applying a release agent to a film-like carrier, curing or drying the applied release agent layer to form a release agent layer, and then generating fine cracks in any part of the release agent layer by a discontinuity treatment of the release agent layer to be described later, and exposing the carrier serving as a base material from such a cracked part. Therefore, the above meaning in the present invention does not mean a known method of first applying a release agent to a portion (only a portion in contact with an adhesive layer) of the surface of a support to expose the surface of the support from the portion not applied with the release agent.

FIG. 2 is an enlarged cross-sectional view showing the packaging material and the like of the present invention after the release agent layer has been subjected to a discontinuous treatment. As can be seen from the figure, cracks were generated in the release agent layer 2, and the carrier 1 as a base was exposed from such cracked portions 4. Similarly, FIG. 4 is an enlarged plan view showing a state (magnified 2000 times) of the surface of the release agent after the discontinuous treatment of the release agent layer, which is observed by a scanning electron microscope. As can be seen from fig. 4, after the stretching treatment, cracks were generated in the release agent layer 2, and the carrier 1 as a base was exposed from the cracked portions 4.

The packaging material of the present invention is, for example, a packaging material in which, when a sealing process is performed between both superposed surfaces of a release agent layer, the release agent layer at a portion subjected to the sealing process is subjected to a discontinuation process, a carrier is exposed from a crack portion of the release agent layer, and the exposed carrier is used for the sealing process. In this case, for example, when the support is a plastic film containing a thermoplastic resin as a main component, the sealing process can be carried out by a hot-melt adhesion method such as heat sealing.

FIG. 3 is a sectional view showing the structure of a seal portion when the packaging material of the present invention is used as a single package of a sanitary napkin, and when a seal is formed between both superposed surfaces of a release agent layer. As shown in the figure, the material a for packaging a sanitary napkin B is obtained by discontinuing only the release agent layer 2 having the seal portion C and performing heat-sealing treatment using the carrier 1 exposed from the crack portion of the release agent layer 2.

The seal portion in the present invention is a structure in which the surfaces of the release agent layers having a cracked portion are superposed on each other and the carrier having the cracked portion exposed from the release agent layer is heat-sealed to be thermally fused as described above. The structure of the seal portion of the present invention may be constituted by a combination of a packaging material having a cracked portion in the release agent layer and a heat-fusible sheet not having the release agent layer formed thereon.

In addition, the packaging material of the present invention may be formed by not only discontinuing the release agent layer only at the portion subjected to the sealing treatment, but also discontinuing the release agent layer as a whole. Even in such a case, since the cracked portion of the release agent layer has a fine area, the release property required for the packaging material is not significantly reduced, and both the release property and the sealing property can be achieved.

The material of the release agent layer forming release agent used for the packaging material and the like of the present invention is not particularly limited as long as it has the above-described functions, and for example, a silicone-based release agent of a heat curing type, an ultraviolet curing type, an electron beam curing type, or the like, or a long chain alkyl-based release agent can be suitably selected and used. Among these, when the support is formed of a thermoplastic film, it is preferable to use an ultraviolet-curable or electron-beam-curable silicone release treating agent that does not require heat treatment when forming the release agent film.

In addition, when the release agent used for the packaging material or the like of the present invention is discontinuously treated, it is preferable that the release agent layer has specific film strength properties so that cracks are easily generated in the release agent layer, and specifically, the film breaking strength of the release agent layer measured by a method described later is 3.0kg/cm²～30kg/cm²And/or a Young's modulus of 2.2kg/cm²～500kg/cm²Preferably, the breaking strength is 6.0kg/cm²～20kg/cm²And/or a Young's modulus of 3.0kg/cm²～300kg/cm²The physical properties of (1).

When the strength of the coating of the release agent layer is less than the above-described physical property range, the hardness (brittleness) required of the release agent layer is not sufficient when the release agent layer is subjected to a discontinuation treatment after the coating is formed, and the carrier layer may be hardly exposed after the release agent is discontinued. If the physical property range is larger than the above range, the release agent layer is too brittle, and the release agent layer tends to easily come off the carrier.

The thickness of the release agent layer formed on the surface of the carrier is not particularly limited as long as the release function is maintained when the release agent layer is subjected to the discontinuous treatment, but is preferably 0.05 to 4.0. mu.m, more preferably 0.3 to 1.5. mu.m. The carrier may have a release agent layer on one or both sides.

In the packaging material of the present invention, after the release layer is formed on the surface of the carrier, a step for exposing a part of the carrier by performing a discontinuous treatment on the release layer is necessary, and if necessary, the release agent layer may be entirely or only partially subjected to a discontinuous treatment on the release agent layer which is hermetically bonded. As the step of discontinuing the release agent layer, for example, in the case of stretching the carrier, there is a method of forming the release agent layer on the surface of the carrier, stretching the carrier, and then discontinuing the release agent layer entirely, or a method of discontinuing the release agent layer partially.

The stretching method is not particularly limited, and various methods of stretching the support such as inter-roll stretching and tenter stretching can be used.

In this case, the stretching ratio is preferably 1.1 times or more, more preferably 1.2 times to 8 times, the Transverse Direction (TD) and/or the Machine Direction (MD) of the support. When the stretch ratio is less than 1.1 times, the effect of the release agent layer being a discontinuous layer is small, and the carrier layer is less exposed, and thus sufficient sealing properties may not be obtained.

In addition, as another method of subjecting the release agent layer to the discontinuous treatment, after the release agent layer is formed on the surface of the carrier, the surface of the release agent layer may be pierced with needle-like projections to form holes, so that the cross section in the thickness direction of the carrier layer is exposed, and sealing can be performed by heat and pressure at the time of heat sealing.

As another method, there is a method of making a release agent layer discontinuous by rubbing with another substance such as a blast cleaning method.

In the packaging material and the like of the present invention, the peeling force after the discontinuation treatment of the release agent layer is 1.1 times or more, preferably 1.2 times to 10.0 times, the peeling force increase property before the discontinuation treatment. When the peel force rising property after the discontinuous treatment of the release agent layer is less than 1.1 times, sufficient seal strength may not be obtained when the heat-seal method is used to seal the space between the two superposed surfaces of the release agent layer of the packaging material or the like of the present invention.

Such a peeling force rising property can be obtained by changing the stretching ratio when the release agent layer is subjected to a discontinuous treatment by stretching; when the release agent layer is discontinuously processed by the opening, the number of the holes can be changed; or when the release agent layer is subjected to the discontinuous treatment by the blast cleaning method, the conditions such as the kind of the polishing agent and the blowing pressure of the polishing agent can be appropriately controlled by changing the conditions. Therefore, various processing conditions are determined depending on the type of the discontinuous processing, and the peeling force rising property is set to the above-described preferable range.

The peeling force rising property defined in the present invention means a value measured by a measurement method described later.

FIG. 5 is a schematic view of a sample for measuring the sealing strength of the packaging material of the present invention. 2 samples D each having a release agent layer 2 which was discontinuous according to the present invention were stacked with the two surfaces of the release agent layer facing each other, and one end (portion C) thereof was sealed.

The packaging material of the present invention has a sealing strength of 2g/25mm or more, which is an adhesion force of a sealed portion when both surfaces of the adhesive release agent layer are sealed by heat sealing or pressure sealing after the release agent layer is subjected to a discontinuous treatment, and the upper limit is lower than the breaking strength of the carrier, and the sealing strength is preferably 5g/25mm to 1000g/25 mm. The breaking strength of the carrier means a state in which the strength when the carrier is broken without peeling from the sealed portion, that is, the adhesive strength of the sealed portion is very high when the sealing strength is measured. When the sealing strength is less than 2g/25mm, the sealed portion is easily peeled off, and for example, when used in packaging applications, the sealing durability of the contents tends to be poor.

The carrier of the packaging material, the base material for an adhesive tape or the separator of the present invention is not particularly limited as long as it can be bonded by pressure or heat sealing, and is preferably made of a plastic film containing a polyolefin-based thermoplastic resin as a main component.

Examples of the polyolefin-based thermoplastic resin include polyethylene, polybutene, polyhexene, and polyoctene, which may be used alone or in a mixture. Preferably polyethylene is used. As such polyethylene, any one of ultra-low density polyethylene, linear low density polyethylene, medium density polyethylene, high density polyethylene, or a blend thereof may be used. Preferably, the blend of linear low density polyethylene and/or low density polyethylene with a content of 15 wt% or more, or the blend of high density polyethylene with a content of 80 wt% or less is used. If necessary, a material having a higher melting point than that of the ultra-low density polyethylene or the low density polyethylene may be added to improve the heat resistance. The melting point of such a material is 185 ℃ or lower, preferably 110 to 180 ℃.

Further, an elastomer component such as an elastomer of styrene, polyolefin, polyester, etc. may be added in an amount of 40% by weight or less to improve flexibility.

Specific examples of the thermoplastic film-forming polymer include ultra-low density polyethylene, linear low density polyethylene, medium density polyethylene, high density polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene- (meth) acrylic acid copolymer, ethylene- (meth) methyl acrylate copolymer, ethylene- (meth) ethyl acrylate copolymer, polyethylene-propylene copolymer, olefinic elastomer, styrenic elastomer, polyisobutylene, and butyl rubber, and one or more kinds of composite resins selected from these may be used.

The olefin elastomer includes ethylene-propylene rubber (EPT), ethylene-propylene-diene rubber (EPDM), ethylene-propylene, or ethylene-butylene elastomers; examples of the styrene-based elastomer include styrene-isoprene-styrene block copolymers (SIS), styrene-butadiene-styrene block copolymers (SBS), and the like, and hydrogenated products thereof.

In the present invention, the support may have a single-layer structure as described above, but for example, it is composed of at least 2 layers, and a heat-sealing layer having a melting point lower by 5 ℃ or more than that of one or both of the layers ensures easy heat-sealing. In particular, the material is more suitable when it is in the form of a bag or when it is fixed.

That is, in the case of heat sealing, a single layer is likely to cause voids in the sheet if it is hot, and it is difficult to control the voids, and in the case of 2 or more layers, since a dedicated heat-sealing layer is provided, it is effective to easily determine the heat-sealing conditions.

As such a support, for example, the above-mentioned support composed of two or more layers, one layer being composed of a low density polyethylene (melting point 100 ℃ C.) and the heat-sealable layer being composed of a high density polyethylene (melting point 120 ℃ C.) and the like. In this case, the release agent layer is provided on the side of the low-density polyethylene as the heat seal layer.

The carrier of the present invention may be a laminate of a thermoplastic film, a nonwoven fabric or a woven fabric.

In addition, in the present invention, the surface of the support may be roughened by blending the above-mentioned polymer, and as with a pearskin surface or an embossed surface, a high-grade feeling may be exhibited because of lack of apparent gloss, or linear mobility may be improved because of reduction of coefficient of dynamic friction. By this blending, since polymers are mixed in a separated form from each other by utilizing the difference in compatibility between the polymers and the difference in surface tension upon melting, the surface portion cannot be uniformly mixed, so that the surface is not smooth and rough, and the surface thereof can be regarded as a pearskin surface or an embossed surface. The roughness of the surface is generally 0.2 to 30 μm, preferably 2 to 5 μm. However, when the embossments or pears are formed by rolling or the like as described later, the roughness of the surface is preferably within 1/2 thickness of the film. By blending polymers having different characteristics, a blend having respective advantages can be obtained, and a new function, for example, a function of obtaining both softness and deformation resistance can be obtained.

Further, as described above, blending of a relatively soft polymer or elastomer can reduce the peeling noise when used for peeling or the like, and has an effect that the peeling noise is not noticeable when used.

As a method for forming a pearskin surface or an embossed surface, in addition to the above-mentioned polymer blending method, for example, it is possible to form a film by a press roll surface contacted after extrusion by a T-head in producing a film. The latter method is more preferable when the embossed surface is formed in the present invention.

The support of the present invention comprises at least 2 layers of a multilayer thermoplastic film, and at least one surface of the multilayer thermoplastic film is a pearskin surface or an embossed surface formed by blending the above polymers. With such a structure, the characteristics of the polymer films of the respective layers can be combined to add new functions as in the case of polymer blending. For example, the heat sealability and tear strength described above can be improved, and the function of good hand feeling can be added.

In another embodiment of the carrier of the present invention, at least one surface of the thermoplastic film, for example, the pearskin surface or embossed surface has a roughness (Ra) of 1/2 or less of the film thickness, and the other surface has a release agent layer. With such a structure, there are soft feeling at the time of contact, high-class feeling in appearance, and the linear mobility is improved to the effect of reducing the coefficient of dynamic friction.

In another embodiment, at least one surface of the thermoplastic plastic film may be a pearskin surface or an embossed surface having a surface roughness (Ra) of 1/2 or less of the film thickness, and the surface may be provided with a release agent layer. In this case, the peel surface or embossed surface after the peeling treatment has a static friction coefficient of less than 1.5, preferably 0.2 to 1.1. The coefficient of dynamic friction is less than 1.2, preferably 0.1 to 1.0. Within this range, the linear mobility can be improved, and there is an effect that wrinkles, substrate running, breakage, and the like are hardly generated when contacting with the press roller.

The thickness of the carrier is not particularly limited, but is generally 1mm or less, and is generally 10 to 50 μm, preferably 20 to 40mm, from the viewpoint of flexibility and pliability.

In the present invention, the carrier film is required to have a certain strength from the viewpoint of transferring the carrier film on a production line, and the tensile strength in the Machine Direction (MD) of the carrier is generally 300gf/10mm or more, preferably 300 to 1000gf/10 mm. The tensile strength in the transverse direction is generally 200gf/10mm or more, preferably 300 to 1000gf/10 mm.

When the adhesive tape is used as a base material for an adhesive tape, one surface of the carrier has a release agent layer, and the other surface has an adhesive layer. The adhesive constituting the adhesive layer is not particularly limited in kind, and it is preferable to use a general acrylic (アクリル) or rubber adhesive, transfer it to a substrate by lamination, and in the case of direct coating, it is preferable to apply it to the substrate by a curtain flow or melt flow method without heating.

The present invention will be described in further detail with reference to examples and comparative examples. (example 1)

A release agent was prepared from 100 parts by weight of a cationically polymerizable ultraviolet-curable silicone release agent and 2 parts by weight of salt photoinitiator, and the release agent was applied to one surface of a low-density polyethylene film having a thickness of 30 μm to a thickness of 0.7. mu.m. The sheet is stretched after forming a cured film by irradiation with ultraviolet light, to obtain the packaging material, the base material for an adhesive tape, or the separator of the present invention. The stretching method (conditions for discontinuation of release agent layer treatment) was a method of stretching the sheet in the Machine Direction (MD) and the Transverse Direction (TD) with a stretching machine at a stretching ratio of 1.2. (example 2)

The same procedure as in example 1 was repeated except that a release agent was prepared from 100 parts by weight of an addition reaction heat-curable silicone release agent and 2 parts by weight of a platinum-based curing catalyst, and a cured coating film was formed using a hot air dryer as the curing conditions, to obtain a packaging material, a base material for an adhesive tape, or a separator of the present invention. (example 3)

The packaging material, the base material for an adhesive tape, and the separator of the present invention were produced in the same manner as in example 1, except that a radical polymerization type acryl-modified electron ray-curable silicone release agent was used as the release agent and a cured film was formed by irradiation with an electron ray as the curing condition. Comparative example 1

The packaging material, the base material for adhesive tape, or the separator of the present invention was produced in the same manner as in example 1, except that the release agent was prepared using 100 parts by weight of the cationically polymerizable ultraviolet-curable silicone release agent and 0.5 part by weight of salt photoinitiator.

In the sample prepared under the above conditions, the release agent layer was not discontinuous and the carrier layer could not be exposed by the stretching treatment. Comparative example 2

The same procedure as in example 1 was repeated except that 100 parts by weight of the radical polymerizable ultraviolet-curable silicone release agent and 2 parts by weight of the photodecomposition initiator were used to prepare a release agent, to obtain a packaging material, a base material for an adhesive tape, or a separator of the present invention.

In the sample prepared under the above conditions, the release agent layer was not discontinuous and the carrier layer could not be exposed by the stretching treatment.

The results of measuring the breaking strength and young's modulus of the silicone release agent film used, and the results of evaluating the sealing properties of the obtained samples are shown in table 1. [ formation of Release agent layer coating ]

The release agents used in the examples and comparative examples were applied to a polyester film (polyethylene terephthalate separator) whose surface was subjected to a release treatment using a coater, and the following curing treatment was performed depending on the type of the release agent to form a release agent film having a thickness of 150 μm.

Curing conditions of the cationically polymerizable ultraviolet-curable silicone release agent.

An ultraviolet lamp: f-450 (H-vacuum tube) manufactured by FUSION corporation

Amount of ultraviolet ray: 120W/cm

Linear velocity: 5m/min

Ultraviolet irradiation environment: in the air

Curing conditions for a radically polymerized UV-curable silicone release agent

An ultraviolet lamp: f-450 (H-vacuum tube) manufactured by FUSION corporation

Amount of ultraviolet ray: 120W/cm

Linear velocity: 5m/min

Ultraviolet irradiation environment: the oxygen concentration was adjusted to 50ppm or less by nitrogen substitution.

Curing conditions of the Electron Beam-curable Silicone Release agent

Electron ray irradiation apparatus: ESI corporation, CB-150 electric shield (Electrocurrain)

Electron beam emission amount: 3 mrad

Linear velocity: 5m/min

Electron ray irradiation environment: the oxygen concentration was controlled to 50ppm or less by nitrogen substitution.

Curing conditions for heat-curable silicone release agent

Curing treatment is carried out for 3 minutes by using a hot-blast stove under the condition of a set temperature of 110 ℃. [ measurement conditions for fracture Strength and Young's modulus of Release agent coating ]

The release agent film formed under the above conditions was cut into a width of 15mm, and then measured under conditions of a chuck pitch of 30mm and a tensile speed of 30 mm/min using a tensile tester. [ Peel force ascending Property ]

An adhesive tape (trade name: No 500, manufactured by Nindon electric engineering Co., Ltd.) having a width of 50mm was stuck to the surface of the release agent of the sample (stretched sample) in which the release agent layer was discontinuous at room temperature by a single reciprocation of a 2kg roller. The peel force was measured using a tensile tester under the conditions of a tensile speed of 300mm/min and a peel angle of 180 °. The ratio of the peel force to the peel force of the sample before stretching (before discontinuation treatment of the release agent layer) measured by the same method was determined by the following equation.

Peel force rising property (double) peel force of sample after stretching/peel force of sample before stretching [ seal strength, adhesion ]

The surfaces of 2 samples (width 25mm) in which the release agent layers were not continuous were superposed on each other, and one end thereof was bonded by 2 sealing methods shown below at a sealing width of 5mm to prepare a sample for measuring sealing strength (see FIG. 5). The sealing strength was measured by a T-peel test using a tensile tester at a tensile speed of 300 mm/min.

Further, a sample for measuring seal strength was prepared in the same manner, and the seal portion of the sample was peeled off by hand to evaluate adhesiveness. The level of adhesion was evaluated on the following 5 scales.

Very good performance

Good rated power

Delta just right

X is weak

XXX is very weak (sealing method)

1. Heat sealing method

The heat seal was performed between the superposed surfaces of the sample release agent layers by using a heat sealer under conditions of 130 ℃ for 2 seconds.

2. Pressure sealing method

Using a pressure sealer, using a pressure sealing pressure of 10kg/cm²The mesh roller of (3) seals the superposed surface of the sample release agent layer.

TABLE 1

	Strength (kg/cm) of peel agent film2)		Lifting force of peeling force (double)		Heat sealing		Pressurized seal
									Breaking strength	Young's modulus	Longitudinal direction	Transverse direction	Sealing strength	Adhesion property	Sealing strength	Adhesion property
	Example 1	6	3	1.2	1.2	10	○	5									△
Example 2									8	6	1.4	1.5	30	◎	10	○
	Example 3	16	241	1.5	1.6	40	◎	25									○
Comparative example 1									1	0.1	1	1	0	××	0	××
	Comparative example 2	2	2	1 05	1.06	1	×	0									××

^*Unit of seal Strength (g/25mm)

Possibility of industrial utilization

The packaging material, the base material for an adhesive tape, or the separator of the present invention has the above-described structure, and the sealing portion is a surface on which the release agent layers are superimposed, and can be bonded by heat sealing or pressure sealing. The release agent layer can maintain the release property to the adhesive article after discontinuous treatment.

As a result, when the present invention is used as a packaging material, for example, when an article with an adhesive portion such as a sanitary napkin having an adhesive layer is directly packaged, since the superposed surface of the release agent layer of the material can be subjected to a sealing process, which is impossible with a packaging material with a conventional release function, the packaging process has an effect of being easily automated when a packaging material with a release function is used.

Claims (7)

1. A packaging material, a base material for an adhesive tape or a separator, characterized in that it has a release agent layer on at least one surface of a film-coated carrier, and the release agent layer is composed of a release agent film which is discontinuously formed to expose a part of the carrier.

2. The packaging material, the base material for an adhesive tape, or the separator according to claim 1, wherein the release agent layer has a crack, and the surface of the film-like support is exposed from the crack.

3. The packaging material, the base material for the adhesive tape, or the separator according to claim 1 or 2, wherein the breaking strength of the release agent film constituting the release agent layer is 3.0kg/cm²-30kg/cm²And/or a Young's modulus of 2.2kg/cm²-500kg/cm²。

4. The packaging material, the substrate for adhesive tape, or the separator according to claim 2, wherein the release agent layer has a release force increased by 1.1 times or more after the discontinuous treatment.

5. The packaging material, the substrate for adhesive tape, or the separator as claimed in claim 2, wherein the release agent layer has a sealing strength between the surfaces of the release agent layers after the discontinuous treatment of 2g/25mm or more, and the upper limit thereof is lower than the breaking strength of the support.

6. The packaging material with a peeling function as set forth in claim 1, wherein the packaging material is used as a single packaging sheet for sanitary napkins.

7. A packaging material, a base material for an adhesive tape or a separator as claimed in claim 2, wherein said base material or said separator has a sealing structure which is obtained by heat-sealing surfaces of a release agent layer having a cracked portion.