JP6967283B2 - Deodorant bag - Google Patents

Description

The present invention relates to a deodorant bag.

Conventionally, a deodorant bag made of a resin laminate is known (for example, Patent Document 1).

The deodorant bag described in Patent Document 1 is composed of a laminate of a sealant film and a base film, and the sealant film is an inner layer constituting the inner surface of the bag.

In the deodorant bag described in Patent Document 1, the sealant is such that the heat seal strength between the sealant film and the base film is within a predetermined range, and the heat capacity for crystal melting by DSC measurement of the sealant film is within a predetermined range. It constitutes a film. As a result, for example, if the contained material is susceptible to alteration (fermentation or putrefaction) by microorganisms such as bacteria (hereinafter referred to as easily altered inclusions) such as filth and swill, it is caused by the alteration. It suppresses the discharge of odorous components to the outside of the bag.

International Publication No. 2014/175313

However, if the easily volatile container is stored in the bag for a long period of time (for example, for one week or more), the degree of deterioration of the easily volatile container increases due to the growth of microorganisms inside the bag. , The amount of odorous components generated inside the bag increases. When the amount of odorous components increases, there is a problem that the odorous components generated inside the bag are easily discharged to the outside.

On the other hand, it is desired that this kind of bag can be easily opened.

In view of such problems, it is an object of the present invention to provide a deodorant bag capable of achieving both relatively excellent deodorant properties and ease of opening the bag.

As a result of diligent studies by the present inventor, when calcium hydroxide is contained as an antibacterial agent and a surfactant as a slip agent is contained in the inner layer of the deodorant bag, the surfactant becomes the water. It was found that it inhibits the deodorant and antibacterial effects of calcium oxide. By setting the ratio of the surfactant contained in the inner layer to a predetermined value or less with respect to the mass of the resin in the inner layer, the deodorant property is excellent, and even when a easily denatureable container is contained, the surfactant is excellent. It was found that the generation of odorous components inside the bag can be sufficiently suppressed.
Further, in general, in order to facilitate opening of the deodorant bag, it is necessary to include the surfactant in the inner layer, but the present inventor contains the surfactant in the inner layer of the deodorant bag. Even if the ratio of the surfactant contained in the inner layer to the mass of the resin of the inner layer is not more than a predetermined value, the surface roughness Ra of the inner surface of the inner layer is made to be more than a predetermined value. Alternatively, it has been found that the bag can be easily opened by setting the _{coefficient of static friction μ S} when the inner surfaces of the inner layers are brought into contact with each other to a predetermined value or less.

That is, the deodorant bag according to the present invention has an inner layer constituting the inner surface of the bag.
The inner layer contains a resin and calcium hydroxide particles and does not contain a surfactant, or contains a surfactant of 1000 ppm or less with respect to the mass of the resin.
The surface roughness Ra of the inner surface of the inner layer is 2 μm or more.

According to such a configuration, the inner layer has an inner layer constituting the inner surface of the bag, and the inner layer contains calcium hydroxide particles and does not contain or contains a surfactant with respect to the mass of the resin. Since it is 1000 ppm or less, it is relatively excellent in deodorant property. In addition, the decrease in antibacterial action due to the calcium hydroxide is suppressed. Therefore, the antibacterial action of the calcium hydroxide particles can be more sufficiently exerted. As a result, even when the easily degradable container is stored inside the bag for a relatively long period of time, it is possible to suppress the generation of odorous components inside the bag.
In particular, when the odorous component generated inside the bag is acidic, it can be converted into a component having a relatively low odor by neutralizing such an odorous component with calcium hydroxide particles. As a result, the amount of odorous components inside the bag can be reduced.
Further, since the surface roughness of the inner surface of the inner layer is 2 μm or more, the contact area between the inner surfaces of the inner layer can be reduced when the bag is closed. Therefore, it is possible to reduce the van der Waals force acting on the contact portion between the inner surfaces of the inner layer. As a result, the deodorant bag can be opened relatively easily.

The deodorant bag according to the present invention has an inner layer constituting the inner surface of the bag and has an inner layer.
The inner layer contains a resin and calcium hydroxide particles and does not contain a surfactant, or contains a surfactant of 1000 ppm or less with respect to the mass of the resin.
_{The coefficient of static friction μ S} when the inner surfaces of the inner layers are brought into contact with each other is 0.3 or less.

According to such a configuration, as described above, the deodorant property is excellent, and even when the easily degradable container is contained, the generation of odorous components inside the bag can be suppressed. In particular, when the odorous component generated inside the bag is acidic, the amount of the odorous component inside the bag can be reduced.
_{Further, since the coefficient of static friction μ S} when the inner surfaces of the inner layers are brought into contact with each other is 0.3 or less, the contact portion between the inner surfaces of the inner layers can be made slippery when the bag is closed. .. Therefore, it is possible to reduce the van der Waals force acting on the contact portion between the resins of the inner layer. As a result, the deodorant bag can be opened relatively easily.

In the deodorant bag, the average particle size of the calcium hydroxide particles is preferably 0.5 μm or more and 20 μm or less.

According to such a configuration, the openability of the bag can be improved, and the deodorant bag can be efficiently manufactured.

In the deodorant bag, the calcium hydroxide particles are preferably contained in a proportion of 1.0% by mass or more and 20% by mass or less with respect to the mass of the resin.

According to such a configuration, the deodorizing action of the calcium hydroxide particles can be more sufficiently exerted, and the deodorizing bag can be efficiently manufactured.

In the deodorant bag, it is preferable that an odor barrier layer made of a material having a gas barrier property higher than that of the inner layer is provided on the outside of the inner layer.

According to such a configuration, even when the odor component generated inside the bag permeates the inner layer, the odor barrier layer can prevent the odor component from moving to the outside of the odor barrier layer. can.

According to the present invention, it is possible to provide a deodorant bag capable of achieving both relatively excellent deodorant properties and ease of opening the bag.

(A) is a plan view which shows the whole structure of the deodorant bag which concerns on this embodiment. (B) is a diagram showing the configuration seen from the A side of (a). (C) is a diagram showing the configuration seen from the A'side of (a). FIG. 3 is an enlarged cross-sectional view showing a resin film used for molding a deodorant bag according to the present embodiment. An electron micrograph of a cross section of a resin film used for molding the deodorant bag according to Example 1. FIG. 3 is an enlarged cross-sectional view showing an inner layer of a resin film used for molding a deodorant bag according to the present embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

The deodorant bag 1 according to the present embodiment is configured by molding a resin film 10. Specifically, the deodorant bag 1 according to the present embodiment has, as shown in FIGS. 1A to 1C, in the resin film 10 formed into a tubular body, the facing portions 11 of the tubular body facing each other. It is configured by sealing (sealing) one open end edge 13 side of the resin film 10 in a state where the 12 is folded inward (a state in which the gusset is processed).

As shown in FIG. 2, the resin film 10 used for molding the deodorant bag 1 according to the present embodiment is configured as a five-layer laminated film. Specifically, the resin film 10 is arranged on the inner layer 10a constituting the inner surface of the deodorant bag 1 after molding, the outer layer 10b constituting the outer surface of the deodorant bag 1 after molding, and the outer side of the inner layer 10a and the inner side of the outer layer 10b. Between the first adhesive layer 10d arranged between the inner layer 10a and the odor barrier layer 10c and adhering the inner layer 10a and the odor barrier layer 10c, and between the outer layer 10b and the odor barrier layer 10c. It is configured as a laminated film including a second adhesive layer 10e for adhering an outer layer 10b and an odor barrier layer 10c. The resin film 10 is preferably molded to a thickness of 20 μm to 40 μm, and more preferably to a thickness of 25 μm to 35 μm.
When the resin film 10 is a single-layer film, the single-layer film itself becomes the inner layer 10a.

The inner layer 10a contains a resin. Examples of the resin contained in the inner layer 10a include polyethylene and an ethylene copolymer. Examples of the polyethylene include low-density polyethylene, and examples of the low-density polyethylene include linear low-density polyethylene, metallocene linear low-density polyethylene, metallocene low-density polyethylene, and ultra-low-density polyethylene. Examples of the ethylene copolymer include ethylene / vinyl acetate copolymer, ethylene / propylene copolymer, tetrafluoroethylene / ethylene copolymer and the like. Among these, it is preferable to use linear low-density polyethylene from the viewpoint of excellent strength and heat-sealing property when formed into a molded product.

The inner layer 10a contains calcium hydroxide particles 10a1 and does not contain a surfactant as a slip agent, or contains a surfactant of 1000 ppm or less with respect to the mass of the resin contained in the inner layer 10a. In the present specification, the fact that the inner layer 10a does not contain a surfactant means that the amount of the surfactant contained in the inner layer 10a is 10 ppm or less. Further, in the present specification, the inclusion of a surfactant of 1000 ppm or less with respect to the mass of the resin contained in the inner layer 10a means the mass ratio of the surfactant to the mass of the resin at the time of blending. When the surfactant contained in the inner layer 10a is mixed with another solvent, the mass ratio of the surfactant to the mass of the resin means the mass ratio of the surfactant itself to the mass of the resin. do.

As shown in FIGS. 2 and 3, the inner surface 10a has an inner surface (inner surface of the deodorant bag 1) protruding. Specifically, the inner layer 10a has a protruding resin surface portion that covers the calcium hydroxide particles 10a1 or the calcium hydroxide particles 10a1. In FIG. 3, all the portions shown in black or white in the inner layer 10a are calcium hydroxide particles 10a1. Since the inner layer 10a contains the calcium hydroxide particles 10a1 as described above, the inner layer 10a is a protruding portion protruding outward by the calcium hydroxide particles 10a1 on the inner surface side as shown in FIG. It has 10aa and a flat portion 10ab that is not projected outward by the calcium hydroxide particles 10a1. In the inner layer 10a, it is preferable that the entire outer surface of the calcium hydroxide particles 10a1 is covered with the resin contained in the inner layer 10a in the protruding portion 10aa. That is, it is preferable that the outer surface of the calcium hydroxide particles 10a1 is not exposed from the inner surface of the inner layer 10a in the protruding portion 10aa. In the protruding portion 10aa, the distance between the inner surface of the inner layer 10a and the outer surface of the calcium hydroxide particles 10a1 is preferably 3 μm or less, and more preferably 2 μm or less. The cross section of the resin film 10 was observed at a magnification of 500 times using an electron microscope, and the outer surface of each calcium hydroxide particle 10a1 was observed for any 20 calcium hydroxide particles 10a1 in the protruding portion 10aa. It can be measured by measuring the shortest distance d between the inner layer 10a and the inner surface of the inner layer 10a and arithmetically averaging 20 values.

The calcium hydroxide particles 10a1 preferably have a purity of 90% or more, more preferably 95% or more, and further preferably 97% or more. The content of calcium oxide in the calcium hydroxide particles 10a1 is preferably 1% by weight or less.

The average particle size of the calcium hydroxide particles 10a1 is preferably 0.5 μm or more and 20 μm or less. When the average particle size of the calcium hydroxide particles 10a1 is 0.5 μm or more, the opening property of the bag can be improved, and when the average particle size of the calcium hydroxide particles 10a1 is 20 μm or less, the deodorant bag 1 Can be manufactured efficiently. The average particle size of the calcium hydroxide particles 10a1 is measured using a laser diffraction type particle size distribution measuring device (manufactured by Seishin Enterprise Co., Ltd., model LMS-2000e) as a measuring device before compounding. As a specific measurement method, a scattering type measurement mode is adopted, and the wet cell in which the dispersion liquid in which the measurement sample (calcium hydroxide particles) is dispersed is irradiated with laser light to obtain the distribution of scattered light from the measurement sample. obtain. Then, the scattered light distribution is approximated by a lognormal distribution, and the particles having a cumulative degree of 50% (D50) in the range in which the minimum value is 0.020 μm and the maximum value is 2000 μm in the particle size distribution (horizontal axis, σ). Let the diameter be the average particle size.

The calcium hydroxide particles 10a1 are preferably contained in a proportion of 1.0% by mass or more and 20% by mass or less with respect to the mass of the resin contained in the inner layer 10a. In the present specification, the mass ratio of the calcium hydroxide particles 10a1 to the mass of the resin in the inner layer 10a means the mass ratio of the calcium hydroxide particles 10a1 to the mass of the resin at the time of compounding. When the calcium hydroxide particles 10a1 are contained in a proportion of 1.0% by mass or more with respect to the mass of the resin contained in the inner layer 10a, the deodorizing effect of the calcium hydroxide particles 10a1 is more fully exhibited. The deodorant bag 1 can be efficiently manufactured because the calcium hydroxide particles 10a1 are contained in a proportion of 20% by mass or less with respect to the mass of the resin contained in the inner layer 10a. Become.

When the inner layer 10a contains a surfactant of 1000 ppm or less with respect to the mass of the resin, various known ionic surfactants or nonionic surfactants can be used as such a surfactant. Such a surfactant functions as an internal lubricant (dispersant) or an external lubricant (slip agent) in the inner layer 10a. The internal lubricant functions to improve the lubricity between the resins constituting the inner layer in the inner layer 10a and to improve the lubricity between the resin contained in the inner layer and the calcium hydroxide particles 10a1. The external lubricant functions to improve the lubricity of the layer surface. As the surfactant as the internal lubricant, a fatty acid ester-based surfactant (ionic surfactant) can be used. As the surfactant as the external lubricant, a fatty acid amide-based surfactant (ionic surfactant) can be used.

In the deodorant bag 1 according to the present embodiment, the inner layer 10a has a surface roughness Ra of 2 μm or more on the inner surface (inner surface of the deodorant bag 1). Specifically, as described above, the surface roughness Ra of the inner surface is 2 μm or more due to the protrusion of the resin surface portion covering the calcium hydroxide particles 10a1 or the calcium hydroxide particles 10a1. When the surface roughness Ra of the inner surface is within the above numerical range, the contact portion between the resins of the inner layer 10a can be relatively reduced when the deodorant bag 1 is closed, whereby the deodorant bag 1 can be made. It can be opened relatively easily. The surface roughness Ra of the inner surface of the inner layer 10a is preferably 5 μm or more. The surface roughness of the inner surface can be adjusted by the average particle size of the calcium hydroxide particles 10a1 contained in the inner layer and the mass ratio of the calcium hydroxide particles 10a1 to the mass of the resin contained in the inner layer 10a. The surface roughness Ra of the inner surface of the inner layer 10a is the arithmetic mean roughness defined in JIS B0601 (2013). The surface roughness Ra can be measured using a laser microscope (manufactured by KEYENCE CORPORATION, model VK-100) as a measuring device. Specifically, the surface roughness Ra values of any 6 points are measured at a measurement speed of 0.5 mm / sec and the distance between the two points is within a range of 500 μm, and the measured values of the 6 points are arithmetically averaged. Can be measured by. The surface roughness Ra may be 10 μm or less.

Further, in the deodorant bag 1 according to the present embodiment, the inner layer 10a has a coefficient of static friction μ _S of 0.3 or less when the inner surfaces of the inner layers 10a are brought into contact with each other. _{Specifically, as described above, the coefficient of static friction μ S} when the inner surfaces of the inner layers 10a are brought into contact with each other due to the protrusion of the resin surface portion covering the calcium hydroxide particles 10a1 or the calcium hydroxide particles 10a1 is 0.3. It is as follows. When the coefficient of static friction μ _S is in the above numerical range, the contact portion between the inner surfaces of the inner layers 10a can be made relatively slippery when the deodorant bag 1 is closed. As a result, the deodorant bag 1 can be opened relatively easily. _{The static friction coefficient μ S} when the inner surfaces of the inner layers 10a are brought into contact with each other is the average particle diameter of the calcium hydroxide particles 10a1 contained in the inner layer and the mass ratio of the calcium hydroxide particles 10a1 to the mass of the resin contained in the inner layer 10a. Can be adjusted by. _{The coefficient of static friction μ S} when the inner surfaces of the inner layers 10a are brought into contact with each other can be measured in accordance with JIS K7125 (1999) using a friction measuring device as a measuring device. Specifically, the measurement is performed as follows. First, two resin films 10 in which the inner layers 10a are brought into contact with each other and overlapped are placed on the table of the friction measuring machine. Next, a 200 g thread is placed on the two resin films 10 that are overlapped with each other. Next, one of the resin films 10 in contact with the surface of the table of the friction measuring machine is pulled at a measurement speed of 100 mm / min, and the friction coefficient when the one resin film 10 starts to move is measured. In the present specification, the coefficient of static friction μ _S means a value obtained by measuring the coefficient of static friction three times by the above method and arithmetically averaging the measured values three times. The coefficient of static friction μ _S is usually larger than 0.

The inner layer 10a preferably has a thickness of 5 μm or more and 15 μm or less, more preferably 7 μm or more and 13 μm or less, and further preferably 9 μm or more and 11 μm or less.
The thickness of the inner layer 10a means the thickness including the protruding portion 10aa of the inner layer 10a. The thickness of the inner layer 10a can be measured using an electron microscope. Specifically, it can be obtained by observing the cross section of the resin film 10 at a magnification of 500 times, measuring the thickness of arbitrary 5 points randomly selected in the inner layer 10a, and arithmetically averaging these measured values. can.

The outer layer 10b contains a resin. As the resin contained in the outer layer 10b, the same resin as that contained in the inner layer 10a can be used. As the resin contained in the outer layer 10b, it is preferable to use linear low-density polyethylene from the viewpoint of excellent strength and heat-sealing property when formed into a molded product.

The outer layer 10b is a colorant, an AB agent, an internal lubricant (dispersant), and an outer lubricant (slip agent) for coloring the outer layer 10b so that the contents contained in the deodorant bag 1 can be appropriately seen from the outside. ) Is preferably included. It is preferable to use a white pigment as the colorant, and it is preferable to use titanium oxide as the white pigment. It is preferable to use synthetic silicate as the AB agent. Various known surfactants can be used as the internal lubricant and the external lubricant. As the surfactant as the internal lubricant, it is preferable to use a fatty acid ester-based surfactant (ionic surfactant). As the surfactant as the external lubricant, it is preferable to use a fatty acid amide-based surfactant (ionic surfactant).

The outer layer 10b preferably has a thickness of 5 μm or more and 15 μm or less, more preferably 7 μm or more and 13 μm or less, and further preferably 9 μm or more and 12 μm or less. The thickness of the outer layer 10b is measured in the same manner as the thickness of the inner layer 10a.

The odor barrier layer 10c is made of a material having a higher gas barrier property than the inner layer 10a, and suppresses the movement of the odor component generated inside the deodorant bag 1 to the outside. The odor barrier layer 10c contains a resin. Examples of the resin contained in the odor barrier layer 10c include ethylene / vinyl alcohol copolymers, polyamide synthetic resins (for example, nylon and metaxylene nylon), polyethylene terephthalate and the like. Among these, it is preferable to use an ethylene / vinyl alcohol copolymer from the viewpoint of exhibiting high gas barrier properties when formed into a molded product.

The odor barrier layer 10c preferably has a thickness of 1 μm or more and 5 μm or less, and more preferably 1 μm or more and 3 μm or less. The thickness of the odor barrier layer 10c is measured in the same manner as the thickness of the inner layer 10a.

The first adhesive layer 10d contains a resin. Examples of the resin contained in the first adhesive layer 10d include a modified polyolefin resin and a modified polypropylene polymer. Examples of the modified polyolefin resin include acid-modified polyolefin (for example, maleic anhydride-modified polyolefin) and acrylic-modified polyolefin. Examples of the modified polypropylene polymer include an acid-modified polypropylene polymer (for example, a maleic anhydride-modified polypropylene polymer). Among these, as the resin contained in the first adhesive layer 10d, it is preferable to use an acid-modified polyolefin from the viewpoint of enhancing the adhesiveness between the resin contained in the inner layer 10a and the resin contained in the odor barrier layer 10c.

The first adhesive layer 10d preferably has a thickness of 0.5 μm or more and 2 μm or less, more preferably 0.7 μm or more and 1.5 μm or less, and a thickness of 0.8 μm or more and 1.2 μm or less. It is more preferable to have an adhesive. The thickness of the first adhesive layer 10d is measured in the same manner as the thickness of the inner layer 10a.

The second adhesive layer 10e contains a resin. Examples of the resin contained in the second adhesive layer 10e include the same resins as those contained in the first adhesive layer 10d. As the resin contained in the second adhesive layer 10e, it is preferable to use an acid-modified polyolefin from the viewpoint of enhancing the adhesiveness between the resin contained in the outer layer 10b and the resin contained in the odor barrier layer 10c.

The second adhesive layer 10e preferably has a thickness of 0.5 μm or more and 2 μm or less, more preferably 0.7 μm or more and 1.5 μm or less, and a thickness of 0.8 μm or more and 1.2 μm or less. It is more preferable to have an adhesive. The thickness of the second adhesive layer 10e is measured in the same manner as the thickness of the inner layer 10a.

The deodorant bag 1 having a five-layer structure as described above contains, for example, the raw material of the inner layer 10a, the raw material of the first adhesive layer 10d, the raw material of the odor barrier layer 10c, the raw material of the second adhesive layer 10e, and the raw material of the outer layer 10b. It is preferable to produce by a co-extrusion inflation method in which co-extrusion is performed in this order. In the production by the coextrusion inflation method, usually, coextrusion is performed while stretching at a blow-up ratio of 1.2 to 10 times. As the device used for the coextrusion inflation method, it is preferable to use a water-cooled or air-cooled inflation molding device.

As the raw material for each of the above layers, it is preferable to use resin pellets obtained by molding the resin into pellets. The resin pellets include masterbatch pellets formed by blending predetermined components (AB agent, surfactant, white pigment, etc.) in a resin at a high concentration to form pellets, or the resin itself formed into pellets. Natural pellets and the like can be used.

As the raw material of the inner layer 10a, a master batch pellet in which calcium hydroxide particles 10a1 are blended in a resin at a high concentration and a natural pellet can be used. By using the natural pellets, the mass ratio of the calcium hydroxide particles 10a1 to the mass of the resin in the inner layer 10a can be adjusted. When the inner layer 10a contains a surfactant, a masterbatch pellet in which a surfactant is blended in a resin at a high concentration is further used as a raw material for the inner layer 10a. As raw materials for the outer layer 10b, a masterbatch pellet in which an AB agent is blended in a resin at a high concentration, a masterbatch pellet in which a surfactant is blended in a high concentration in a resin, and a colorant (white pigment, etc.) in the resin. Masterbatch pellets blended in high concentration and natural pellets can be used. By using the natural pellets, the mass ratio of the AB agent, the surfactant, and the colorant to the mass of the resin in the outer layer 10b can be adjusted. The natural pellets can be used as the raw material for the odor barrier layer 10c, the raw material for the first adhesive layer 10d, and the raw material for the second adhesive layer 10e.

In the production of the deodorant bag 1 having a five-layer structure as described above, when the deodorant bag 1 having a five-layer structure is manufactured using the same raw materials as the raw materials of the first adhesive layer 10d and the second adhesive layer 10e, that is, 4 When the deodorant bag 1 having a five-layer structure is manufactured using the seed raw materials, a four-kind five-layer coextrusion inflation method can be adopted. Further, in the case of manufacturing the deodorant bag 1 having a five-layer structure by using different raw materials for the raw materials of the first adhesive layer 10d and the second adhesive layer 10e, that is, the deodorant bag 1 having a five-layer structure using five kinds of raw materials. In the case of manufacturing, a coextrusion inflation method of 5 types and 5 layers can be adopted.

In the production of the deodorant bag 1 using the water-cooled or air-cooled inflation molding apparatus, the resin film 10 co-extruded with a tubular body having a five-layer structure is processed into a bag body. The resin film 10 co-extruded with a five-layer structure cylinder is one of the resin films 10 in a state where the facing portions 11 and 12 of the cylinder are folded inward (a gusset-processed state). After sealing the open end edge 13 side, it can be processed into a bag by cutting it to a predetermined length (bottom sealing method). Further, in the resin film 10 co-extruded with a five-layer structure cylinder, the side ends facing each other are cut open along the direction in which the cylinder extends to form two sheet-shaped resin films 10. It is also possible to process two sheet-shaped resin films 10 into a bag by stacking them on top of each other, sealing the three sides of the stacked sheet-shaped resin films 10 and cutting them to a predetermined length. (Three-way seal method). The resin film 10 can be sealed by heat sealing or the like. Further, the deodorant bag 1 may be chucked on the open end edge side, or the deodorant bag 1 may be purse-stringed by threading the open end edge side of the deodorant bag 1.

The deodorant bag 1 according to the present invention is not limited to the above embodiment. Further, the deodorant bag 1 according to the present invention can be variously modified without departing from the gist of the present invention.

For example, in the above embodiment, an example in which the deodorant bag 1 is formed by using a five-layer laminated film as the resin film 10 is shown, but the resin film 10 constituting the deodorant bag 1 is limited to a five-layer film. It's not a thing. Any structure may be used as long as it includes an inner layer 10a constituting the inner surface of the bag. For example, the deodorant bag 1 may be configured with only the inner layer 10a, that is, a single-layer structure. Alternatively, the deodorant bag 1 may be composed of a three-layer laminated film (an inner layer 10a, an outer layer 10b, and an adhesive layer for adhering the inner layer 10a and the outer layer 10b) without the deodorization barrier layer 10c.

Further, in the deodorant bag 1 according to the present embodiment, the inner layer 10a has a surface roughness Ra of 2 μm or more on the inner surface, and has a coefficient of static friction μ _{S when the inner surfaces of the inner layers 10a are brought into contact with each other.} Although the example of 0.3 or less has been described, it is not necessary for the inner layer 10a to satisfy all of the above at the same time. Either of the above, that is, the surface roughness Ra of the inner surface is 2 μm or more, or the coefficient of static friction μ _S when the inner surfaces are brought into contact with each other is 0.3 or less. It suffices if it meets.

Next, the present invention will be described in more detail with reference to test examples.

<Manufacturing of deodorant bags according to Test Examples 1 to 12>
The deodorant bags according to Test Examples 1 to 12 were prepared using the raw materials shown in Tables 1 to 12 below. The deodorant bag according to each example was manufactured by the bottom seal method using a top-blown air-cooled inflation molding apparatus as described in the above embodiment. The deodorant bag according to each example was produced as a gusset type bag. The thickness of the resin film constituting the deodorant bag according to each example was 30 μm. The deodorant bag according to each example had a width (distance between the gusseted both ends) of 230 mm and a length (direction along the direction in which the gusseted both ends extend) of 350 mm. The thickness of each layer of the resin film was measured using an electron microscope. Specifically, the cross section of the resin film was observed at a magnification of 500 times, the thicknesses of arbitrary 5 points randomly selected in each layer were measured, and these measured values were calculated by arithmetic mean.
In the table below, the mass ratio of the calcium hydroxide particles means the mass ratio of the calcium hydroxide particles to 100 the mass of LLDPE at the time of blending, and the mass ratio of the surfactant is the mass ratio of the surfactant at the time of blending. It means the ratio of the total mass of the surfactant contained in the inner layer to the mass of LDPE.
Further, in each of the following test examples, the mass ratio of the AB agent to the mass of LLDPE in the outer layer was 600 ppm.

(Raw material for inner layer)
As the raw material of the inner layer according to Test Examples 1, 4, 5 and 12, calcium hydroxide particles having an average particle diameter of 3.6 μm (manufactured by Natural Japan Co., Ltd., product name: Okhotsk Calcium) are used as a resin and 20 with respect to the mass of LLDPE. Master batch pellets (hereinafter referred to as first calcium hydroxide pellets) prepared by adding at a ratio of% by weight, and Natura pellets of LLDPE for adjusting the mass ratio of calcium hydroxide particles to the mass of LLDPE in the inner layer. (Hereinafter referred to as LLDPE pellets) and.
The average particle size of the calcium hydroxide particles was measured using a laser diffraction type particle size distribution measuring device (manufactured by Seishin Enterprise Co., Ltd., model LMS-2000e) as a measuring device before compounding. As a specific measurement method, a scattering type measurement mode is adopted, and the wet cell in which the dispersion liquid in which the measurement sample (calcium hydroxide particles) is dispersed is irradiated with laser light to obtain the distribution of scattered light from the measurement sample. Obtained. Then, the scattered light distribution is approximated by a lognormal distribution, and the particles having a cumulative degree of 50% (D50) in the range in which the minimum value is 0.020 μm and the maximum value is 2000 μm in the particle size distribution (horizontal axis, σ). The diameter was taken as the average particle size.
As raw materials for the inner layer according to Test Examples 2, 3, 9 and 10, the first calcium hydroxide pellet and the master batch pellet prepared by adding a slip agent at a predetermined mass ratio to the mass of LLDPE (hereinafter referred to as “master batch pellet”). , Slip agent pellets), master batch pellets (hereinafter referred to as dispersant pellets) prepared by adding a dispersant in a predetermined mass ratio to the mass of LLDPE, and the above LLDPE pellets were used. In each test example, the mass ratio of the slip agent to the mass of the LLDPE in the slip agent pellet and the mass ratio of the dispersant to the mass of the LLDPE in the dispersant pellet were determined to be surface active after being diluted with the LLDPE pellet. The mass ratio as an agent was adjusted to be the value shown in each table.
The first calcium hydroxide pellet itself was used as the raw material for the inner layer according to Test Example 6.
As a raw material for the inner layer according to Test Example 7, a master batch pellet (hereinafter referred to as a second calcium hydroxide pellet) prepared by adding the calcium hydroxide particles at a ratio of 40% by mass with respect to the mass of the LLDPE was used. , The above LLDPE pellets were used.
As shown in FIG. 3, in the deodorant bag according to Example 1, the outer surface of the calcium hydroxide particles was not exposed from the inner surface of the inner layer. The same applies to the deodorant bags according to the other examples.
As a raw material for the inner layer according to Test Example 8, a master batch pellet prepared by adding an AB agent (synthetic silicate particles) having an average particle diameter of 3 μm at a ratio of 20% by mass with respect to the mass of the LLDPE (hereinafter, AB agent pellets), the slip agent pellets, the dispersant pellets, and the LLDPE pellets were used.
As the raw material for the inner layer according to Test Example 11, the slip agent pellet, the dispersant pellet, and the LLDPE pellet were used.

(Raw material for outer layer)
As the raw material of the outer layer according to each example, the AB agent pellet, the slip agent pellet, the dispersant pellet, and the white pigment (titanium oxide) are added in a predetermined mass ratio to the mass of the LLDPE. The prepared master batch pellets (hereinafter referred to as pigment pellets) and the above LLDPE pellets were used.

(Raw materials for the first adhesive layer and the second adhesive layer)
Natural pellets of modified polyolefin were used as raw materials for the first adhesive layer and the second adhesive layer according to each example.

(Raw material for deodorant barrier layer)
As a raw material for the deodorant barrier layer according to Test Examples 1 to 10 and 12, EVOH natural pellets having an ethylene content of 32 mol% were used.

(Raw material for intermediate layer)
The above LLDPE pellets and the above dispersant pellets were used as raw materials for the intermediate layer according to Test Example 11.

<Evaluation of viable cell count, antibacterial activity and productivity>
Table 13 below shows the results of evaluating the viable cell count and antibacterial activity of the inner surface of the inner layer of the deodorant bags according to Test Examples 1, 4 to 7, and 10 to 12, and the productivity of each of the above deodorant bags. The result was shown. The viable cell count and antibacterial activity value were determined according to JIS Z28015. Escherichia coli was used as the test bacterium. Further, in the evaluation of the viable cell count and the antibacterial activity, the inner surface of the inner layer of each of the above deodorant bags was not wiped with alcohol. In the productivity items of Table 13 below, 〇 means that the inner layer can be formed extremely stably in the production of the deodorant bag having a five-layer structure, and Δ means that the inner layer can be formed in comparison. It means that the film can be stably formed (the bag is not torn during the film formation), and x means that the film formation of the inner layer is extremely unstable (the bag is torn during the film formation).

From Table 13, the viable cell count (24 hours later) on the inner surface of the inner layer of the deodorant bag according to Test Examples 1 and 4 to 7 is the viable cell count on the inner surface of the inner layer of the deodorant bag according to Test Examples 10 to 12. It turned out to be less than after 24 hours). Further, the antibacterial activity value of the inner surface of the inner layer of the deodorant bag according to Test Examples 1 and 4 to 7 is larger than the antibacterial activity value of the inner surface of the inner layer of the deodorant bag according to Test Examples 10 to 12. Do you get it. From these results, if the ratio of the mass of the calcium hydroxide particles to the mass of the resin in the inner layer is 1% by mass or more, the increase in the viable cell count on the inner surface of the inner layer of the deodorant bag can be suppressed, and the deodorant bag can be used. It is considered that the antibacterial activity value of the inner surface of the inner layer can be maintained at a large value. Further, if the ratio of the mass of the surfactant to the mass of the resin in the inner layer is less than 5000 ppm, an increase in the viable cell count on the inner surface of the inner layer of the deodorant bag can be suppressed, and the inner surface of the inner layer of the deodorant bag can be suppressed. It was found that the antibacterial activity value can be maintained at a large value.
Further, from Table 13, if the ratio of the mass of the calcium hydroxide particles to the mass of the resin is 20% by mass or less, the film formation of the inner layer can be performed relatively stably, that is, the production can be performed efficiently. I found that I could do it.

<Evaluation of long-term deodorant performance>
Tables 14 to 16 below show the results of examining the long-term deodorizing performance of the deodorizing bags according to Test Examples 1, 8 and 11. Isovaleric acid (acid gas), ammonia (basic gas), and methyl mercaptan (acid gas) were used as the odorous components, and the initial concentration of the odorous components in the bag was 100 ppmm. The long-term deodorant performance was investigated according to the following procedure.

(1) Each of the above odorous components is injected into the deodorant bag according to each of the above examples so as to have an initial concentration of 100 ppm.
(2) After sealing (heat sealing) the top side of the deodorant bag according to each of the above examples, the deodorant bag according to each sealed example is placed in an aluminum laminated bag with a sealing chuck, and aluminum is used with a sealing chuck. Seal the laminated bag.
(3) Check the odor in the aluminum laminated bag every elapsed time (1 hour, 24 hours, 48 hours, 72 hours and 168 hours).

The long-term deodorant performance was evaluated by a sensory test by three panelists. In Tables 14 to 16 below, 〇 means that no odor is felt in the aluminum laminated bag, △ means that a slight odor is felt in the aluminum laminated bag, and × means that the aluminum laminated bag is strong. It means to feel the odor.

From Tables 14 to 16, in the deodorant bag according to Test Example 11 which does not contain any calcium hydroxide particles in the inner layer and does not have an odor barrier layer, the aluminum laminated bag is used after 1 hour for any odor component. It turned out that a strong odor was felt inside.
Further, in the deodorant bag according to Test Example 8 which has an odor barrier layer but does not contain any calcium hydroxide particles in the inner layer, the odor in the aluminum laminated bag tends to become stronger with time. In particular, when the odor components are acid gases such as isovaleric acid and methyl mercaptan, the odor is felt in the aluminum laminated bag after 48 hours, and a strong odor is felt after 168 hours. It turned out that it would be possible.
On the other hand, in the deodorant bag according to Test Example 1, no odor was felt in the aluminum laminated bag even after 168 hours had passed for any of the odor components.
From these results, it was found that the long-term deodorizing performance was improved by containing calcium hydroxide particles in the inner layer. In particular, it was found that excellent deodorizing performance can be obtained in the case of acid gases (isovaleric acid and methyl mercaptan) in which the leakage of odorous components into the aluminum laminated bag is more remarkable. It is considered that this is because the acid gas is neutralized by the calcium hydroxide particles, so that the leakage of the odorous component is suppressed more remarkably.

<Effect of surfactant on odor in bag>
Regarding the deodorant bags according to Test Examples 1, 3, 9 and 10, the effect of the surfactant on the odor in the deodorant bag was investigated. The results are shown in Table 17. Isovaleric acid was used as the odor component, and the initial concentration of the odor component in the bag was 100 ppm. The effect of the surfactant on the odor was investigated according to the following procedure.
(1) Isovaleric acid is injected into the deodorant bag according to each of the above examples so as to have an initial concentration of 100 ppm.
(2) The top side of the deodorant bag according to each of the above examples is sealed (heat-sealed), and the top side of the deodorant bag is opened every elapsed time (1 hour, 24 hours, 48 hours, 72 hours and 168 hours). And check the odor in the deodorant bag. After confirming the odor of the deodorant bag whose top side has been opened, the top side is sealed (heat-sealed) again.
The effect of the surfactant on the odor was examined by a sensory test by three panelists. In Table 17 below, 〇 means that no odor is felt in the deodorant bag, △ means that a slight odor is felt in the deodorant bag, and × means that a strong odor is felt in the deodorant bag. Means.

From Table 17, in the deodorant bag according to Test Examples 1 to 3 in which the ratio of the mass of the surfactant to the mass of the resin is 1000 ppm or less, the odor derived from isovaleric acid is contained in the deodorant bag even after 168 hours have passed. Was not felt. On the other hand, the deodorant bag according to Test Example 9 in which the ratio of the mass of the surfactant to the mass of the resin is 1500 ppm, and the deodorant bag according to Test Example 10 in which the ratio of the mass of the surfactant to the mass of the resin is 5000 ppm. The odor tended to become stronger with time, and after 168 hours, a strong odor derived from isovaleric acid was felt in the deodorant bag.
From this result, it was found that if the ratio of the mass of the surfactant to the mass of the resin is 1000 ppm or less, the odor in the deodorant bag can be sufficiently suppressed.

<Effect of the mass ratio of surfactant and calcium hydroxide particles to the mass of resin on long-term deodorant performance>
Regarding the deodorant bags according to Examples 1, 4, 10 and 12, the effect of the mass ratio of the surfactant and the calcium hydroxide particles to the mass of the resin on the long-term deodorant performance of the deodorant bag was investigated. The results are shown in Table 18. Dog feces were used as the odor component.
The evaluation was carried out in the same manner as described in the above-mentioned evaluation of long-term deodorant performance, except that dog feces were used as the odor component.

From Table 18, in the deodorant bag according to Test Example 10 in which the ratio of the mass of the surfactant to the mass of the resin was 5000 ppm, the odor in the aluminum laminated bag tended to become stronger with time. On the other hand, in the deodorant bag according to Test Example 1 in which the surfactant was below the detection limit, the odor in the aluminum laminated bag did not tend to increase with time.
Further, when comparing Test Examples 1, 4, and 12, it was found that the odor in the aluminum laminated bag tended to increase with time as the mass ratio of the calcium hydroxide particles to the mass of the resin decreased.
From these results, it was found that the deodorant bag in which the surfactant in the inner layer is below the detection limit can maintain the long-term deodorant performance. It was also found that the higher the mass ratio of the calcium hydroxide particles to the mass of the resin in the inner layer, the longer the long-term deodorizing performance can be maintained.

<Effect of the mass ratio of calcium hydroxide particles to the mass of resin on the openability of the deodorant bag>
Regarding the deodorant bags according to Test Examples 1, 4, 11 and 12, the effect of the mass ratio of calcium hydroxide particles to the mass of the resin on the openability of the deodorant bag was investigated. The results are shown in Table 19.
For the deodorant bags according to each example, the surface roughness Ra of the inner surface of the inner layer was measured, and the results are also shown in Table 19. The surface roughness Ra of the inner surface of the inner layer is the arithmetic mean roughness defined in JIS B0601 (2013). The surface roughness Ra was measured using a laser microscope (manufactured by KEYENCE CORPORATION, model VK-100) as a measuring device. Specifically, the surface roughness Ra values of any 6 points are measured at a measurement speed of 0.5 mm / sec and the distance between the two points is within a range of 500 μm, and the measured values of the 6 points are arithmetically averaged. Measured by.
The openability of the deodorant bag was evaluated by examining the ease of opening the deodorant bag by three panelists. In the item of openability in Table 19 below, 〇 means that the inner layers of the deodorant bag are weakly adhered to each other and the deodorant bag can be easily opened, and Δ means that the inner layers of the deodorant bag are relatively weakly adhered to each other. It means that the deodorant bag can be opened relatively easily from the gap with a nail or the like, and x means that the inner layers of the deodorant bag are strongly adhered to each other and are blocked, and it is difficult to open the deodorant bag. ..

From Table 19, it was found that as the mass ratio of the calcium hydroxide particles to the mass of the resin increased in the inner layer, the surface roughness Ra of the inner surface of the inner layer of the deodorant bag increased.
Further, comparing the openability of the deodorant bag according to the example in which the inner layer does not contain a surfactant, that is, the deodorant bag according to Test Example 1, the deodorant bag according to Test Example 4, and the deodorant bag according to Test Example 12. It was found that the openability became better as the value of the surface roughness Ra of the inner surface of the inner layer increased. Furthermore, it was also found that if the surface roughness Ra is 2 or more, the bag can be opened relatively easily.
Further, by setting the surface roughness Ra of the inner surface of the inner layer to 2 or more, even if the deodorant bag does not contain the surfactant in the inner layer, Test Example 11 containing the surfactant in the inner layer. It was found that the same degree of openability as the deodorant bag according to the above can be obtained.

<Effect of average particle size of calcium hydroxide particles on the openability of deodorant bag>
In order to investigate the effect of the average particle size of the calcium hydroxide particles in the inner layer on the opening property of the deodorant bag, five deodorant bags containing calcium hydroxide particles having different average particle sizes were prepared in the inner layer. (Deodorant bag according to Test Examples 13 to 17). The openability of the deodorant bag was evaluated by examining the ease of opening the deodorant bag by three panelists. In the deodorant bag according to each of the above examples, the average particle size of the calcium hydroxide particles contained in the inner layer is 0.3 μm (Test Example 13), 0.5 μm (Test Example 14), and 3.6 μm (Test Example, respectively). 15), 20 μm (Test Example 16), and 25 μm (Test Example 17). The average particle size of the calcium hydroxide particles was measured by the above method. In each example, the ratio of the mass of calcium hydroxide to the mass of LLDPE, which is a resin, in the inner layer was 5% by mass. As the raw material of the inner layer, a master batch containing 40% by mass of calcium hydroxide having an average particle size with respect to the mass of LLDPE, and the above-mentioned LLDPE pellets were used. The same raw materials as those shown in Test Example 1 were used as the raw materials for the outer layer, the first adhesive layer, the second adhesive layer, and the odor barrier layer of the deodorant bag according to each example. Further, the deodorant bag according to each example has the same dimensions as the deodorant bag according to Test Example 1 and the like by the bottom seal method using a top-blown air-cooled inflation molding device, similarly to the deodorant bag according to Test Example 1 and the like. It was made as follows.
We also investigated the productivity of deodorant bags according to each example. Productivity was determined by whether or not the screen mesh installed between the screw of the extruder and the die was clogged during the production of the deodorant bag according to each example in the inflation molding apparatus.
The results of evaluating the openability and productivity of the deodorant bag according to each example are shown in Table 20 below. In the item of openability in Table 20, 〇 means that the inner layers of the deodorant bag are weakly adhered to each other and the deodorant bag can be easily opened, and Δ indicates that the inner layers of the deodorant bag are relatively weakly adhered to each other, such as nails. It means that the deodorant bag can be opened relatively easily from the gap, and x means that the inner layers of the deodorant bag are strongly adhered to each other and are blocked, and it is difficult to open the deodorant bag. Further, in the productivity section of Table 20, 〇 means that the screen mesh is not clogged during the production of the deodorant bag and the production can be performed satisfactorily, and × indicates that the screen mesh is formed during the production of the deodorant bag. It means that clogging will occur and production will be poor.

From Table 20, it was found that only the deodorant bag according to Test Example 13, in which the average particle size of the calcium hydroxide particles in the inner layer was 0.3 μm, was inferior in openability. From this result, it was found that if calcium hydroxide particles having an average particle size of 0.5 μm or more are contained in the inner layer, the opening property of the deodorant bag can be improved.
Further, from Table 20, the deodorant bag according to Test Example 13 and the deodorant bag according to Test Example 17 have poor productivity when manufacturing the bag, that is, it becomes difficult to efficiently manufacture the deodorant bag. It turned out. It is considered that the reason why the productivity of the deodorant bag according to Test Example 17 is poor is that the average particle size of the calcium hydroxide particles is large. Further, it is considered that the reason why the productivity of the deodorant bag according to Test Example 13 is poor is that the calcium hydroxide particles are aggregated and coarsened, resulting in clogging of the screen mesh.
From the above results, considering the productivity of the deodorant bag, in other words, the efficient production of the deodorant bag, it is appropriate that the average particle size of calcium hydroxide in the inner layer is 0.5 μm or more and 20 μm or less. Is considered to be.

<Effect of the coefficient of static friction when the inner surfaces of the inner layers are brought into contact with each other on the openability of the deodorant bag>
Table 21 shows the results of investigating the effect of the coefficient of static friction on the openability of the deodorant bag when the inner surfaces of the inner layers were brought into contact with each other for the deodorant bags according to Test Examples 1, 11 and 12. The coefficient of static friction μ _S was measured in accordance with JIS K7125 (1999) using a friction measuring device as a measuring device. Specifically, it was measured as follows. First, two resin films 10 in which the inner layers 10a were brought into contact with each other and overlapped were placed on the table of the friction measuring machine. Next, 200 g of threads were placed on the two resin films 10 that were overlapped with each other. Next, one of the resin films 10 in contact with the surface of the table of the friction measuring machine was pulled at a measurement speed of 100 mm / min, and the coefficient of friction when the one resin film 10 started to move was measured. The coefficient of static friction μ _S was measured three times for each example.
Table 21 also shows the results of examining the openability of the deodorant bags according to each example.

Looking at the values of the coefficient of static friction μ _{S in} Table 21, the deodorant bag according to Test Example 1 _{has a maximum μ S} value of 0.3, and the deodorant bag according to Test Example 11 _{has a maximum μ S} value of 0. to which the at .2, it can be seen that the value of mu _S becomes 0.51 at the maximum in the deodorant bag according to test example 12.
The value of the static friction coefficient mu _S deodorant bag according to Test Example 11 is smaller than the static friction coefficient mu _S deodorant bag according to Test Example 12, the surfactant in the inner layer of deodorizing bag according to Test Example 11 (slip It is considered that the cause is that the agent and the dispersant) are contained.
On the other hand, although the deodorant bag according to Test Example 1 does not contain a surfactant in the inner layer, _{the value of the static friction coefficient μ S} of the deodorant bag according to Test Example 1 is the test example. It is smaller than the value of the _{coefficient of static friction μ S} of the deodorant bag according to No. 12. It is considered that this is due to the ratio of the mass of the calcium hydroxide particles to the mass of the resin in the inner layer. Specifically, since the deodorant bag according to Test Example 1 contains 5% by mass of calcium hydroxide particles in the inner layer, the protruding portion of the calcium hydroxide particles on the inner surface of the inner layer is relatively large, and the inner surface of the inner layer is relatively large. The deodorant bag according to Test Example 12 has a small number of contact portions with each other, whereas the deodorant bag according to Test Example 12 contains as little calcium hydroxide particles as 0.5% by mass in the inner layer, so that the protruding portion of the calcium hydroxide particles on the inner surface. It is considered that the cause is that the amount of calcium hydroxide is relatively small and the contact portion between the inner surfaces of the inner layers is increased.
Further, looking at the results of examining the openability of the deodorant bag according to Test Example 1, the deodorant bag according to Test Example 11, and the deodorant bag according to Test Example 12, it is related to the deodorant bag according to Test Example 1 and the deodorant bag according to Test Example 11. It can be seen that the deodorant bag is easy to open, whereas the deodorant bag according to Test Example 12 is difficult to open.
From these results, it is considered that the deodorant bag can be easily opened if the value of the _{coefficient of static friction μ S} when the inner surfaces of the inner layers come into contact with each other is set to 0.30 or less.

1: Deodorant bag, 10: Resin film, 11: Facing part, 12: Facing part, 13: Open edge,
10a: inner layer, 10b: outer layer, 10c: odor barrier layer, 10d: first adhesive layer,
10e: Second adhesive layer,
10a1: Calcium hydroxide particles.

Claims (5)

It has an inner layer that constitutes the inner surface of the bag and has an inner layer.
The inner layer contains low-density polyethylene and calcium hydroxide particles, and contains 10 ppm or less of a surfactant.
A deodorant bag having a surface roughness Ra of the inner surface of the inner layer of 2 μm or more. It has an inner layer that constitutes the inner surface of the bag and has an inner layer.
The inner layer contains low-density polyethylene and calcium hydroxide particles, and contains 10 ppm or less of a surfactant.
A deodorant bag having a _{coefficient of static friction μ S} of 0.3 or less when the inner surfaces of the inner layers are brought into contact with each other. The deodorant bag according to claim 1 or 2, wherein the average particle size of the calcium hydroxide particles is 0.5 μm or more and 20 μm or less. The deodorant bag according to any one of claims 1 to 3, wherein the calcium hydroxide particles are contained in a proportion of 1.0% by mass or more and 20% by mass or less with respect to the mass of the low-density polyethylene. The deodorant bag according to any one of claims 1 to 4, wherein an odor barrier layer made of a material having a gas barrier property higher than that of the inner layer is provided on the outside of the inner layer.

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