JP6180740B2 - Sealed structural deodorant packaging - Google Patents

Description

  The present invention relates to a hermetically sealed deodorant packaging material.

Conventionally, packaging materials for fresh foods are filled with inert gas such as nitrogen or oxygen inside the packaging materials that contain fresh foods in order to prevent the oxidation of fresh foods or maintain the freshness of fresh foods. Wrapping material is used.
An example of such a packaging material is a packaging bag described in Patent Document 1. The packaging bag described in Patent Document 1 includes a general chuck portion that can be resealed and re-sealed at an opening portion of a bag base having an oxygen absorbing function, and various foods and beverages such as hams and sausages and hamburgers. , Curry, stew, rice cake, Chinese food utensils, liquid seasonings and the like to be packaged products that are boiled or retort heat treated and sterilized or sterilized.

JP 2007-022558 A

However, in the packaging material having a high sealing property capable of enclosing the packaged body as described above, the odor component of the sealed contents, the odor component of the resin constituting the packaging material, and the like stay inside the packaging material. For this reason, when the packaging material is opened, the odor component is released, which may give the user a discomfort.
An object of the present invention is to provide a sealed structural deodorizing packaging material that can seal the contents and can suppress the retention of odor components inside the packaging material.

The sealed structural deodorant packaging material according to the present invention is composed of a laminated film having a gas-impermeable outer layer and a polyolefin inner layer, and a bag-like body having an opening, and the inner layer in the vicinity of the opening. And a plastic chuck portion that is formed to extend in a transverse direction across the opening and seals the opening.
The chuck portion includes a pair of plastic film portions stacked on the inner layer so as to extend in the transverse direction, and a chuck formed on the pair of plastic film portions so as to extend in the transverse direction. At least any one of the inner layer, the pair of plastic film portions, and the chuck is formed of a deodorizing plastic layer containing zeolite. The zeolite has a SiO ₂ / Al ₂ O ₃ molar ratio of 3.0 or more and a crystal structure of at least one selected from ZSM-5 type and Y type.

According to the present invention, the opening portion is hermetically sealed with a chuck, whereby the space portion in the bag-shaped main body can be kept in a hermetically sealed state, and gas permeation into the bag-shaped main body can be suppressed by the outer layer. .
Further, since it is formed of a deodorizing plastic layer containing zeolite in at least one of the bag-shaped main body and the chuck portion, the odor component of the space portion formed by the chuck of the pair of plastic film portions and the pair of plastic films The odor component of the space part in the bag-shaped main body in the vicinity of the part is adsorbed. Therefore, according to the present invention, it is possible to provide a sealed structural deodorant packaging material that can seal the contents and can suppress the retention of odor components inside the packaging material.
The sealed structural deodorant packaging material of the present invention is suitable for packaging and storage of materials in which the presence of moisture and odor components in the environment is not preferred. Further, the sealed structural deodorant packaging material is suitable for packaging odorous contents.

It is a partial cross section figure of the sealing structure type deodorizing packaging material which concerns on this invention. It is the elements on larger scale of the sealing structure type deodorizing packaging material shown in FIG. It is a partial cross section figure which shows the state which absorbed the moisture of the sealing structure type deodorizing packaging material shown in FIG. It is the elements on larger scale of another chuck | zipper of the sealing structure type deodorizing packaging material which concerns on this invention. It is the elements on larger scale of another chuck | zipper of the sealing structure type deodorizing packaging material which concerns on this invention. It is the elements on larger scale of another chuck | zipper of the sealing structure type deodorizing packaging material which concerns on this invention. It is the elements on larger scale of another chuck | zipper of the sealing structure type deodorizing packaging material which concerns on this invention. It is the elements on larger scale of another chuck | zipper of the sealing structure type deodorizing packaging material which concerns on this invention. It is a graph which shows the result of having measured the time-dependent change of the density | concentration of ammonia in the bag which put the test piece of the sealing structure type deodorizing packaging material. It is a graph which shows the result of having measured the time-dependent change of the density | concentration of the acetic acid in the bag which put the test piece of the sealing structure type deodorizing packaging material.

Embodiments of a sealed structural deodorant packaging material according to the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic and ratios of dimensions and the like are different from actual ones. Therefore, specific dimensions and the like should be determined in consideration of the following description. Moreover, the part from which the relationship and ratio of a mutual dimension differ also in between drawings is contained.
Referring to FIGS. 1 and 2, the sealed structural deodorant packaging material 10 is constituted by two laminated films 40 each having a gas impermeable outer layer 20 and a polyolefin inner layer 30, and has an opening 52. A bag-shaped main body 50 and a plastic chuck portion 60 that is formed so as to extend in the transverse direction X across the opening 52 and are sealed in the inner layer 30 in the vicinity of the opening 52 are provided. The chuck unit 60 includes two chucks 70 and 71. The sealed structural deodorant packaging material 10 includes a bag-side portion P formed by forming a sealed joint 54 around the two laminated films 40 by a known method such as welding. In the present embodiment, the chuck 70 is provided on the bag side portion P side in the opening 52, and the chuck 71 is provided on the side opposite to the bag side portion P in the opening 52.
In this specification, “gas impermeable” gases include all gases in a gas phase at room temperature, such as air, hydrogen, oxygen, nitrogen, carbon dioxide, inert gas, and volatile organic compounds. Also, water vapor is included in the gas.
In this specification, “deodorizing” means the ability to adsorb odor components. Therefore, the deodorizing packaging material means a packaging material capable of adsorbing odor components, and the deodorizing plastic layer means a plastic layer capable of adsorbing odor components.

(Bag-shaped body)
The bag-shaped main body 50 includes a pair of laminated films 40, and each laminated film 40 includes a gas-impermeable outer layer 20 and a polyolefin inner layer 30.

(Outer layer)
The outer layer 20 constitutes a surface layer of the laminated film 40. It is preferable that the outer layer 20 is comprised with a vapor deposition film or aluminum foil. A sealed structural deodorant packaging material 10 shown in FIGS. 1 and 2 has an outer layer 20 including a plastic layer 22 and an aluminum foil layer 24.
It is preferable that the vapor deposition film which comprises the outer layer 20 is comprised by aluminum vapor deposition films, such as an aluminum vapor deposition PET film, a silica vapor deposition PET film, an alumina vapor deposition PET film, etc., for example. For example, when the outer layer 20 includes the aluminum foil layer 24, the plastic layer 22 is provided on the aluminum foil. The plastic layer 22 can be used to protect the aluminum foil layer 24 and simplify printing. The thickness of the outer layer 20 varies depending on the type of the package and is not particularly limited, but is usually 10 μm to 100 μm, and preferably about 10 μm to 30 μm.

The plastic layer 22 is not particularly limited as long as it is a thermoplastic resin, but polyethylene terephthalate, nylon, and polypropylene are used. Among them, polyethylene terephthalate is excellent in heat resistance, printing performance, strength, and the like. Preferably used. The outer layer 20 may be an antistatic formulation.
The aluminum foil layer 24 is a layer for preventing moisture permeation from the outside into the package, and is made of aluminum foil. As the thickness of the aluminum foil, a thickness of about 7 μm to 15 μm is usually sufficient, and this thickness can prevent gas from permeating from the outside of the package. A nylon layer may be interposed between the aluminum foil layer 24 and the inner layer 30 as necessary.

(Inner layer)
The inner layer 30 includes a deodorizing plastic layer 32 containing a zeolite that can adsorb an odor component and having a polyolefin, and a pair of non-zeolite-containing polyolefin layers 34 and 34 having no polyolefin and having a polyolefin. The zeolite contained in the deodorizing plastic layer 32 has a SiO ₂ / Al ₂ O ₃ molar ratio of 3.0 or more, and the crystal structure is selected from ZSM-5 type and Y type.
The pair of zeolite-free polyolefin layers 34 are stacked on both sides of the deodorizing plastic layer 32 so as to sandwich the deodorizing plastic layer 32.
The density of the polyolefin of the deodorizing plastic layer 32 and the zeolite-free polyolefin layer 34 used for the inner layer 30 can be selected from those in the range of 0.880 to 0.960 g / ml. Furthermore, the adsorption rate of components can be improved by making the density of the polyolefin of the deodorizing plastic layer 32 lower than the density of the polyolefin of the non-zeolite-containing polyolefin layer 34.
The deodorizing plastic layer 32 is preferably made by kneading zeolite into polyethylene or ethylene elastomer.

  The polyolefin of the deodorizing plastic layer 32 and the non-zeolite-containing polyolefin layer 34 is preferably a single substance or a mixture selected from polyethylene, ethylene elastomer, polypropylene or propylene elastomer. More preferably, the polyolefin of the deodorizing plastic layer 32 or the zeolite-free polyolefin layer 34 is polyethylene or an ethylene-based elastomer, and the density of the polyethylene or ethylene-based elastomer of the zeolite-free polyolefin layer 34 is 0.880 to 0.930 g. / Ml, more preferably 0.910 to 0.925 g / ml. The density of the pair of zeolite-free polyethylenes is 0.910 g to 0.960 g / ml, and more preferably 0.915 to 0.930 g / ml. The polyethylene is preferably low density polyethylene or ethylene elastomer.

(Zeolite type)
Zeolite has a structure of condensed acid of silicate, and the basic unit thereof is a SiO ₄ tetrahedron with four oxygens (O) formed around silicon (Si) arranged at the apex, and An SiO ₄ tetrahedron is an AlO ₄ tetrahedron in which aluminum (Al) is substituted in place of silicon, and these and other various basic structural units are combined three-dimensionally, and innumerable fine channels (passages) A cage (cavity) is formed. These channels and cages exhibit various properties such as molecular adsorption and ion exchange.
The composition of the zeolite can be represented by the following formula (1), where monovalent and divalent cations are represented by M ⁺ and M ²⁺ , respectively.

(M ⁺ , M ²⁺ _1/2 ) _m [Al _m Si _n O ₂ (m + n)] · xH ₂ O (1)
^{M + = Li +, Na +} , K +, Rb +, (CH 3) 4 N +, (C 2 H 5) 4 N +, (C 3 H 7) 4 N +, C 8 H 16 N +
M ²⁺ = Ca ²⁺ , Mg ²⁺ , Ba ²⁺ , Sr ²⁺ , C ₈ H ₁₈ N ₂ ²⁺
(In the formula, m and n are integers, n ≧ m, and x is a number of 1 or more.)
The C ₈ H ₁₆ N ⁺ is 7-azabicyclo [2.2.1] heptane-7,7-dimethylammonium ion, and C ₈ H ₁₈ N ₂ ²⁺ is 1,4-diazabicyclo [2 2.2] octane-1,4-dimethylammonium ion.

In synthetic zeolite, the arrangement of Si, Al, and O varies depending on the crystal structure, and various polyhedral structures such as A-type, X-type, and Y-type are obtained. In general, it is known that the molar ratio of SiO ₂ / Al ₂ O ₃ of A type is about 2, the molar ratio is 2 to 3 for X type, and 3 or more for Y type.
ZSM-5 is a high silica-pentacil type synthetic zeolite having a ten-membered oxygen ring, developed by Mobil Oil (USA), and is used as a catalyst carrier and an adsorbent. As its analogs, ZSM-11, silicalite, silicalite-2, pentasil-type metallosilicate and the like are known.
The unit cell composition of ZSM-5 can be represented by the following formula (2).
Na _n (Al _n Si _96-n O ₁₉₂ ) · 16H ₂ O (n <27) (2)

In general, A-type and X-type hydrophilic zeolites having a SiO ₂ / Al ₂ O ₃ molar ratio of less than 3 are preferentially adsorbed with moisture in a system in which moisture exists in the atmosphere, and therefore have an odor component. However, the odor component cannot be sufficiently removed by adsorption. When these zeolites are mixed and used in the plastic layer, they are mainly used as moisture absorbing films.
On the other hand, the zeolite capable of adsorbing odor components has a SiO ₂ / Al ₂ O ₃ molar ratio of 3.0 or more, more preferably a SiO ₂ / Al ₂ O ₃ molar ratio of 5.0 or more. . Moreover, the pore diameter of the zeolite which can adsorb | suck an odor component is 5 mm or more, Comprising: Generally, a pore diameter is about 5-9 mm. Moreover, it is the said molar ratio, Comprising: The zeolite whose pore diameter is 6.0-10.0１ can be used.
A SiO ₂ / Al ₂ O ₃ molar ratio of 5.0 or more is called a hydrophobic zeolite, and the hydrophobic zeolite includes ZSM-5 type and Y type. As the SiO ₂ / Al ₂ O ₃ molar ratio is larger, the hydrophobicity is stronger, so that moisture is less likely to be adsorbed and odor components tend to be adsorbed more easily.

In the present invention, zeolite having a SiO ₂ / Al ₂ O ₃ molar ratio of 3.0 or more is used as the deodorizing plastic layer 32 so that odor components can be adsorbed. More preferably, a zeolite having a SiO ₂ / Al ₂ O ₃ molar ratio of 5.0 or more is used.
For example, as a zeolite having a SiO ₂ / Al ₂ O ₃ molar ratio of 5.0 or more and a pore diameter of 5 mm or more, the crystal structure is preferably ZSM-5 type or Y type. Odor components that can be deodorized by the deodorizing plastic layer 32 containing zeolite include ammonia odor, sulfur compound odor such as hydrogen sulfide and methyl mercaptan, amine odor such as trimethylamine and triethylamine, aldehyde odor such as formaldehyde and acetaldehyde, acetic acid Examples include odor, higher fatty acid odor, volatile organic compounds (VOC) such as toluene, xylene, and styrene, and other odor components. By selecting the SiO ₂ / Al ₂ O ₃ molar ratio and pore diameter of the zeolite, it is possible to propose an optimal hydrophobic zeolite according to the target substance to be deodorized.

  When the content of the zeolite in the deodorizing plastic layer 32 exceeds 50% by mass, film formation is possible, but flexibility as a molded article is lost. On the other hand, when the content is less than 1% by mass, the deodorizing ability of the zeolite is not sufficiently exhibited. . The zeolite content of the deodorizing plastic layer 32 can be appropriately selected depending on the odor component to be removed. However, in view of the deodorizing performance, processability, physical properties of the packaging material, etc., the zeolite content of the deodorizing plastic layer 32 is included. The amount is preferably 1% by mass to 50% by mass. The zeolite content is more preferably 10% by mass to 40% by mass.

(Chuck part)
The chuck portion 60 is formed on the inner side in the vicinity of the opening 52 of the bag-like main body 50. The chuck unit 60 includes chucks 70 and 71 having the same shape. The chuck 71 is formed closer to the opening 52 than the chuck 70 of the pair of plastic film portions 72 and 74 in the direction Y perpendicular to the transverse direction X.
The chucks 70 and 71 include a pair of plastic film portions 72 and 74 stacked inside the opening 52 so as to extend in the transverse direction X, and a pair of female films formed on the plastic film portion 72 so as to extend in the transverse direction X. It has claws 82 and 83, a pair of male claws 84 and 85 formed on the plastic film portion 74 so as to extend in the transverse direction X, and a seal portion 88 composed of a pair of seal portions 86 and 87.
The pair of seal portions 86 and 87 are engaged with each other in an airtight manner when the female claws 82 and 83 and the male claws 84 and 85 are engaged with each other to form the pair of lock portions 90 and 91, respectively. Thus, the seal portion 88 is obtained. The pair of male claws 84 and 85 are configured to be engageable with the pair of female claws 82 and 83, respectively. The seal portion 86 is formed on the pair of plastic film portions 72 between the female hook claw 82 and the female hook claw 83 so as to extend in the transverse direction X. The seal portion 87 is formed on the plastic film portion 74 between the male claws 84 and the male claws 85 so as to extend in the transverse direction X.

In the chuck portion 60, the pair of plastic film portions 72 and 74 and / or the chucks 70 and 71 have a SiO ₂ / Al ₂ O ₃ molar ratio of 3.0 or more, and the crystal structure is from ZSM-5 type or Y type. It is formed of a plastic containing zeolite that can adsorb selected odor components.
The plastic forming the chuck portion 60 is not particularly limited, but is preferably a polyolefin that is easy to handle and low in cost.
Among these, in particular, the pair of plastic film portions 72 and 74 preferably have deodorizing plastic layers 72a and 74a containing a polyolefin containing a zeolite capable of adsorbing an odor component.
Moreover, it is more preferable that the pair of plastic film portions 72 and 74 of the chuck portion 60 is formed of plastic containing zeolite, and the chucks 70 and 71 are formed of plastic not containing zeolite. By doing in this way, even if the chuck part 60 is repeatedly opened and closed, zeolite does not precipitate on the surface of the chuck part 60, so that a decrease in sealing performance due to repeated opening and closing of the chuck part 60 can be suppressed. .
The odor component of the space portion R formed by the chucks 70 and 71 of the pair of plastic film portions 72 and 74, the bag side portion P in the bag-shaped main body 50 in the vicinity of the pair of plastic film portions 72 and 74, and the space portions Q and R. Adsorbs odor components.
Thereby, the odor component of the space portion R formed by the chucks 70 and 71 of the pair of plastic film portions 72 and 74 is adsorbed and the pressure of the space portion R is reduced. When the pressure in the space portion R is reduced, the chucks 70 and 71 are closely engaged.

The zeolite-free polyolefin layers 72b and 74b of the plastic film portions 72 and 74 have through holes 75 and 76 formed between the chuck 70 and the chuck 71, respectively. Since the deodorizing plastic layers 72a and 74a of the plastic film portions 72 and 74 are exposed from the through holes 75 and 76, respectively, the deodorizing plastic layers 72a and 74a are disposed between the two seal portions 88 (in other words, It becomes possible to adsorb the odor component of the space portion Q (between the chuck 70 and the chuck 71). That is, by adsorbing the odor component in the space portion Q formed in the chuck portion 60, the odor component in the chuck portion 60 is also adsorbed, so the deodorizing effect of the bag side portion P of the bag-like main body 50 is more efficient. Can last.
Although the shape of the through holes 75 and 76 has been described as a cylindrical side surface shape, it may be a polygonal cylindrical side surface shape, or may be a conical shape or a polygonal pyramid side surface. Moreover, although the through holes 75 and 76 are formed so as to be arranged in one row, a plurality of rows may be used. In the case of multiple rows, a staggered arrangement (an arrangement in which the through holes in one row and the through holes in the other row are displaced by half the pitch between adjacent through holes in the direction in which the rows extend) or a lattice arrangement ( A combination in which the through holes in one row and the through holes in the other row are aligned in the direction in which the rows extend may be used.

The density of the polyolefin in the deodorizing plastic layers 72a and 74a and the zeolite-free polyolefin layers 72b and 74b used for the plastic film portions 72 and 74 can be selected from those in the range of 0.880 to 0.960 g / ml. . Furthermore, the adsorption rate of the odor component can be improved by making the density of the polyolefin of the deodorizing plastic layers 72a and 74a lower than the density of the polyolefin of the non-zeolite-containing polyolefin layers 72b and 74b.
The deodorizing plastic layers 72a and 74a are preferably made by kneading zeolite into polyethylene or ethylene-based elastomer.
The polyolefin of the deodorizing plastic layers 72a and 74a and the non-zeolite-containing polyolefin layers 72b and 74b is preferably a single substance or a mixture selected from polyethylene, ethylene elastomer, polypropylene or propylene elastomer. The polyolefin of the deodorizing plastic layers 72a and 74a and the zeolite-free polyolefin layers 72b and 74b is more preferably polyethylene or an ethylene-based elastomer, and the density of the polyethylene or ethylene-based elastomer of the zeolite-free polyolefin layers 72b and 74b is 0. 880 to 0.930 g / ml, more preferably 0.910 to 0.925 g / ml. The density of the pair of zeolite-free polyethylenes is 0.910 g to 0.960 g / ml, and more preferably 0.915 to 0.930 g / ml. The polyethylene is preferably low density polyethylene or ethylene elastomer.

The deodorizing plastic layers 72a and 74a use zeolite having a SiO ₂ / Al ₂ O ₃ molar ratio of 3.0 or more, preferably SiO ₂ / Al ₂ O ₃ mol so that the odor component can be adsorbed. It is to use zeolite whose ratio is 5.0 or more. Furthermore, it is preferable to use a zeolite having a SiO ₂ / Al ₂ O ₃ molar ratio of 5.0 or more and a pore diameter of 5 mm or more.

  When the content of zeolite in the deodorizing plastic layers 72a and 74a exceeds 50% by mass, film formation is possible, but flexibility as a molded article is lost. On the other hand, when the content is less than 1% by mass, the deodorizing ability of the zeolite is sufficient. It is not demonstrated. The zeolite content of the deodorizing plastic layers 72a and 74a can be appropriately selected depending on the structure and amount of the target odor component to be removed. However, in view of the deodorizing performance, processability, physical properties of the packaging material, etc. The content of zeolite in the functional plastic layers 72a and 74a is preferably 1% by mass to 50% by mass. The zeolite content is more preferably 10% by mass to 40% by mass.

  The seal portions 86 and 87 are parallel to the groove-shaped fastening wall 92 formed in the male claws 84 and 85 and the female claws 82 and 83 so as to be parallel to the male claws 84 and 85, respectively. As described above, a pressing rib 93 is formed on the plastic film portion 72 and press-contacts the clamping wall 92. The cross section of the fastening wall 92 constitutes a continuous groove that becomes wider as the distance from the plastic film portion 74 where the female claws 82 and 83 are formed. The seal portion 88 is configured such that the pressing rib 93 is in pressure contact with the clamping wall 92 so that the pressing rib 93 and the clamping wall 92 are in line contact or surface contact. The fastening wall 92 and the pressing rib 93 are configured such that one of the fastening wall 92 and the pressing rib 93 has a higher rigidity than the other, and the other has a higher elasticity than the other. Alternatively, the fastening wall 92 and the pressing rib 93 are made of a material such that one of the fastening wall 92 and the pressing rib 93 has higher rigidity than the other, and the other has elasticity than the elastic force of the other. It may be configured.

The sealed structural deodorizing packaging material 10 will be described in more detail.
The fastening wall 92 formed inside the female claws 82 and 83 or the male claws 84 and 85 is in close contact with the pressing rib 93 inside the female claws 82 and 83 or the male claws 84 and 85 to form a bag shape. In order to keep the main body airtight, in principle, a continuous groove of an inverted triangle (taper shape which may be a straight line or a curve) which is narrow at the root and wide at the tip is formed. preferable. The other claws preferably have a structure that has sufficient rigidity and does not cause deformation with respect to external force. It is preferable to provide a pressing rib on the inner side of the claw, but this pressing rib is connected to the clamping wall provided on the inner side of one claw by connecting the female claw and the male claw to make line contact. Or it forms so that the perfect seal part 88 of a surface contact may be formed.

  If the contact is merely for the purpose of hermeticity, it is sufficient that the contact is close enough that the tip of the pressing rib is pressed against the wall surface of the fastening wall by the coupling of the lock portion of the plastic chuck. Further, the type of contact is not limited as long as it can be sealed, whether it is a line contact or a surface contact. If a strong pressure or a packaging material with a high degree of sealing is required, it is necessary to use a material with a high rigidity of the lock part, but it is preferable to increase the pressure of the seal part 88 for pressure bonding.

  The seal portion 88 may be a straight line having an inverted triangular cross section (groove) on the tightening wall surface, or may be a curved line having a loose curve. In addition, the tip of the pressing rib that contacts the tightening wall only needs to be line contact or surface contact. For example, the cross section is semicircular, elliptical, triangular, rectangular, ladder, polygonal, etc. It may be. From the viewpoint of ease of production, a semicircular shape, an elliptical shape, a rectangular shape and the like are preferable.

  The plastic film part 72 is provided with pressing ribs 93 inside the female claws 82 and 83 and the male claws 84 and 85. The plastic film portion 74 is provided with male claws 84 and 85 that engage with the female claws 82 and 83. The male claws 84, 85 constitute a groove-shaped fastening wall 92 having a narrow root and a wide tip at the opposite side (inner side) of the male claws 84, 85. The surface of the fastening wall 92 may be a flat surface or a curved surface as long as it can be sealed by pressing against the pressing rib 93. If the surface of the fastening wall 92 is a curved surface having a slight curvature, the fastening wall can be easily manufactured.

  In addition, in the combination of the pressing rib 93 and the fastening wall 92, it may not be easy to increase the precision of the shape in terms of molding. In such a case, if one of the rigidity is high and the other has elasticity, the sealing performance of the seal can be improved. However, there is a problem in providing flexibility for locking the female claw and male claw of the lock part, and it is difficult to manufacture by changing the material of the claw and the pressing rib or the fastening wall 92. For example, it is preferable to form the base portion on the side imparting high rigidity thinly by providing the recess 95 with the base portion on the side imparting elasticity.

  The sealing structure type deodorizing packaging material 10 described above puts the contents in the bag portion and seals the opening portion 52 with the chucks 70 and 71, whereby the seal portion 88 and the pair of lock portions 90 and 91 are The bag-shaped main body is formed between the pair of plastic film portions 72 and 74, keeps the inside of the bag-shaped main body 50 in a sealed state, and suppresses gas permeation into the bag-shaped main body 50 by the outer layer 20. The atmosphere in 50 can be maintained.

  In a state where the opening 52 is hermetically sealed by the chucks 70 and 71, as shown in FIG. 3, a pair of plastic film portions 72 and 74 (A and B in FIG. 3) closer to the bag side portion P than the chuck 70. ) Is bent so as to approach each other (in the direction of arrow F in FIG. 3). Therefore, in the chuck 70 of the bag side portion P of the two chucks 70, 71, the female claw constituting the lock portion 91 on the bag side portion P side of the seal portion 88 of the pair of lock portions 90, 91. 83 and the male claws 85 receive a force to bend toward the seal portion 88 side. Accordingly, the bending force acts so as to increase the pressure contact force of the pressing rib 93 against the groove-shaped tightening wall 92 formed in the female claw 83 and the male claw 85, and the airtightness of the seal portion 88 is increased. Improve sex more.

Further, when the range of A and B in FIG. 3 is bent so as to approach each other, the plastic film portions 72 and 74 in the range between the chuck 70 and the chuck 71 try to bend in a direction away from each other. However, the end portions on the chuck 71 side of the plastic film portions 72 and 74 in the range between the chuck 70 and the chuck 71 are held by the chuck 71 so that the plastic film portion 72 and the plastic film portion 74 are not separated from each other. Yes. Therefore, the female claws 83 and the male claws 85 that constitute the lock portion 91 on the opposite side of the bag side portion P from the seal portion 88 maintain a state in which airtightness is maintained.
Further, since the deodorizing plastic layer 32 of the inner layer 30 adsorbs the odor component in the bag-shaped main body 50 in a state where the opening 52 is sealed with the chucks 70 and 71, the odor component is contained in the bag-shaped main body 50. There is no stagnation.

  The chuck of the sealing structure type deodorizing packaging material is not limited to the above chuck, and may be variously changed as follows, for example.

  As shown in FIG. 4, the chuck 70 a has thin bases of the male claws 84 and 85. Further, the tips of the female claws 82 and 83 extend to the vicinity of the roots of the male claws 84 and 85. By adopting such a configuration, the chuck 70a can be compactly assembled, and can be used for a thin film or a small-capacity packaging material.

  As shown in FIG. 5, the chuck 70b is provided with a double seal portion, provided with one independent wall 89 inside the male claws 84 and 85, and provided with two pressing ribs 93a and 93b. The seal part. For this reason, the width of the plastic chuck is widened, but since the sealing can be performed twice, the sealing degree can be increased. The chuck 70b is useful as a packaging material using a thick film or a large-capacity packaging material.

  As shown in FIG. 6, the chuck 70c is provided with a pressing rib 93c on the inner side of the male claws 84 and 85, and is provided with clamping walls 93d and 93e on the inner side of the female claws 82 and 83, and can be easily molded as a material. By utilizing the advantage of the elastic plastic chuck, a seal line can be formed between the inner walls of the male claws 84 and 85 by using the outer walls of the fastening walls 93d and 93e as pressing ribs.

  As shown in FIG. 7, the chuck 70d may be provided with lock retainers 94a and 94b so that the female and male claws are not easily peeled off depending on the internal pressure due to the high pressure or large capacity. In this case, if only the internal pressure is a problem, the lock retainers 94a and 94b may be provided only inside the packaging material.

  As shown in FIG. 8, the chuck 70 e does not have to include a pressing rib and a clamping wall like the chuck 70.

  In the present embodiment, it has been described that the zeolite capable of adsorbing odor components is included in both the deodorizing plastic layer 32 of the inner layer 20 and the pair of plastic film portions 72 and 74 of the chuck portion 60. Also, it may be included in any one of the chuck portions 60.

  Next, the outer layer 20 and the inner layer 30 of the deodorizing packaging material with a sealed structure type chuck will be specifically described with examples.

Example 1
Kneading 60 kg of ZSM-5 type zeolite (manufactured by UOP) and 140 kg of low density polyethylene (LDPE) having a density of 0.919 g / ml and MFR (190 ° C., 2.16 kg) of 8 Then, extrusion was performed using a die having a die diameter of 4 mmφ × 4 holes to obtain LDPE pellets containing 30% of zeolite.
Thereafter, this pellet and a low density polyethylene (LDPE) (manufactured by Sumitomo Chemical Co., Ltd.) having a density of 0.926 g / ml and an MFR (190 ° C., 2.16 kg) of 0.9 are used, and a pair of plastic film parts is ZSM- Low-density polyethylene (LDPE) containing type 5 zeolite and chuck claws were coextruded so as to be zeolite-free low-density polyethylene (LDPE) (manufactured by Sumitomo Chemical Co., Ltd.) to form a sealed structural chuck.
As a two-type three-layer laminated film, a film was formed so as to be 20 μm LDPE / 60 μm zeolite layer / 30 μm LDPE. Further, corona treatment was performed on the 20 μm LDPE side. Further, 12 μm of PET as the gas-impermeable outermost layer and then 7 μm of Al foil were dried and the 110 μm co-extruded layer prepared previously as the inner layer was dry laminated and dried. Then, after heat-sealing this Al dry laminate laminated film and hermetic structure type chuck (manufactured by Hipack Co., Ltd., Doublexeal (registered trademark)), the four sides of the bag are heat-sealed in stages, and sealed to 40 cm × 50 cm. A structural deodorant packaging was formed.

(Example 2)
A sealed structural deodorant packaging material was formed in the same manner as in Example 1 except that Y-type zeolite (SiO ₂ / Al ₂ O ₃ ratio = 5.0, manufactured by UOP) was used as the zeolite.

(Example 3)
A sealed structural packaging material was formed in the same manner as in Example 1 except that a sealed structural chuck containing no zeolite (double pack seal (registered trademark), manufactured by Hipack Co., Ltd.) was used.

Example 4
Example 1 except that a sealed structure type chuck (Hipack Co., Ltd., Double Xeal (registered trademark)) containing no zeolite was used, and Y-type zeolite was used as the zeolite of the two-type three-layer laminated film of the bag-like body. In the same manner as above, a sealed structural deodorant packaging material was formed.

(Comparative Example 1)
A sealed structural packaging material was formed in the same manner as in Example 1 except that zeolite was not mixed.
(Comparative Example 2)
A sealed structural packaging material was formed in the same manner as in Example 1 except that A-type zeolite (SiO ₂ / Al ₂ O ₃ ratio = 2.0 produced by Union Showa) was used as the zeolite.

(Evaluation method)
The following deodorization evaluation was implemented about the sealing structure type deodorizing packaging material of Example 1, and the sealing structure type packaging material of a comparative example.
(Deodorization evaluation 1)
The sealed structural deodorant packaging material of Examples 1 to 4 and the sealed structural packaging material of Comparative Example 1 were cut into a size of 1 cm × 1.5 cm to prepare test pieces. These test pieces were put in a 250 cm × 350 cm sealable bag and evacuated with a vacuum pump, and then 1.5 ppm of 100 ppm ammonia was introduced. The time-dependent change of ammonia in the bag was measured with a detector tube, and the adsorption performance was calculated. FIG. 9 shows the results of changes over time in the measured ammonia concentration.
(Deodorization evaluation 2)
The sealed structural deodorizing packaging material of Example 1 and the sealed structural packaging material of Comparative Example 2 were cut into a size of 1 cm × 1.5 cm to prepare test pieces. These test pieces were put into a sealable bag of 250 cm × 350 cm and evacuated with a vacuum pump, and then 1.5 L of 40 ppm acetic acid and RH = 60% gas was introduced. The change in acetic acid in the bag over time was measured with a detector tube, and the adsorption performance was calculated. FIG. 10 shows the results of changes in the measured concentration of acetic acid over time.

(Evaluation results)
In all of the test pieces of Examples 1 to 4, deodorization performance close to the deodorization performance of the added zeolite was observed, but almost no deodorization performance was observed in the test pieces of the comparative examples. In addition, the test piece of Comparative Example 2 containing A-type zeolite having a SiO ₂ / Al ₂ O ₃ molar ratio of less than 3.0 did not provide sufficient deodorizing performance.

  DESCRIPTION OF SYMBOLS 10 ... Sealing structure type deodorizing packaging material 20 ... Outer layer, 22 ... Plastic layer, 24 ... Aluminum foil layer, 30 ... Inner layer, 32 ... Deodorizing plastic layer, 34 ... Zeolite-free polyolefin layer, 40 ... Laminated film, 50 ... Bag-like body 52 ... Opening part 60 ... Chuck part (sealed structure type water absorption chuck) 70,70a, 70b, 70c, 70d, 70e, 71 ... Chuck, 72,74 ... Plastic film part, 72a, 74a ... Deodorizing plastic layer of plastic film, 72b, 74b ... Zeolite-free polyolefin layer of plastic film, 75,76 ... Through hole in plastic film part, 82,83 ... Female claws, 84,85 ... Male claws, 86, 87 ... Seal part 88 ... Seal part 89 ... Independent wall 90, 91 ... Lock Parts, 92 ... tightening wall, 93,93a, 93b, 93c ... pushing rib, 93d, 93e ... tightening wall, 94a, 94b ... lock retainer, 95 ... recess

Claims (15)

Consists of a laminated film having a gas-impermeable outer layer and an inner layer, and is formed to extend in a transverse direction across the opening in the bag-like main body having an opening and the inner layer in the vicinity of the opening. A plastic chuck portion that seals the opening,
The chuck portion has a pair of plastic film portions stacked on the inner layer so as to extend in the transverse direction, and a chuck formed on the pair of plastic film portions so as to extend in the transverse direction,
The pair of plastic film portions is formed of a deodorizing plastic layer made of a plastic containing zeolite, and the chuck is made of a plastic not containing zeolite,
The zeolite has a SiO ₂ / Al ₂ O ₃ molar ratio of 3.0 or more and a sealed structure type deodorizing packaging material having a crystal structure of at least one selected from ZSM-5 type and Y type.     The chuck portion further includes another chuck formed on the opening side from the chuck of the pair of plastic film portions so as to extend in the transverse direction, and each of the pair of plastic film portions includes the The sealed structural deodorizing packaging material according to claim 1, further comprising a through hole formed between the chuck and the other chuck, wherein the deodorizing plastic layer is exposed from the through hole.   The sealed structural deodorizing packaging material according to claim 1 or 2, wherein the deodorizing plastic layer is polyolefin.   The sealed structural deodorizing packaging material according to claim 3, wherein the density of the polyolefin contained in the deodorizing plastic layer is 0.880 to 0.960 g / ml.   The chuck includes a pair of female claws formed on one of the pair of plastic film portions so as to extend in the transverse direction, and a pair formed on the other of the pair of plastic film portions so as to extend in the transverse direction. 5. The sealed structural deodorant packaging material according to claim 1, further comprising a pair of male claws that are respectively engageable with the pair of female claws. The chuck further includes a seal portion having a pair of seal portions that are airtightly engaged with each other when each female claws and each male claws engage with each other to form a pair of lock portions. Have
One of the pair of seal portions is formed on one of the pair of plastic film portions between the pair of female claws so as to extend in the transverse direction,
The sealed structural deodorizing package according to claim 5, wherein the other of the pair of seal portions is formed on the other of the pair of plastic film portions between the pair of male claws so as to extend in the transverse direction. Wood. The one claw of the pair of plastic film portions is formed so that one of the pair of seal portions is parallel to one claw of the female claw and the male claw of each lock portion. Having a groove-like fastening wall formed in the plastic film part,
The other of the pair of seal portions has a pressing rib formed on the other claws so as to be in parallel with the other claws, and press-contacting the clamping wall. The sealed structural deodorant packaging material described.   The hermetically sealed deodorizing packaging material according to claim 7, wherein a cross-section of the fastening wall is a continuous groove that becomes wider as the distance from the plastic film portion on which the one claw is formed.   9. The pair of seal portions according to claim 7 or 8, wherein each of the pair of seal portions has a contact surface where the pressing rib and the clamping wall are in line contact or surface contact so that the pressing rib is pressed against the clamping wall. Sealed structural deodorant packaging.   The clamping wall and the pressing rib are formed in a cross-sectional shape such that one of the clamping wall and the pressing rib has higher rigidity than the other, and the other elasticity is higher than one elasticity. The sealed structural deodorizing packaging material according to any one of 7 to 9.   The clamping wall and the pressing rib are made of a material such that one of the clamping wall and the pressing rib is higher in rigidity than the other, and the other is more elastic than the other elastic force. The sealed structural deodorizing packaging material according to any one of claims 7 to 10.   The inner layer is a deodorizing plastic layer containing zeolite and containing polyolefin, and a pair of non-zeolite-containing polyolefin containing polyolefin and containing no zeolite, and is laminated on the deodorizing plastic layer so as to sandwich the deodorizing plastic layer The hermetically sealed deodorizing packaging material according to any one of claims 1 to 11, comprising a pair of zeolite-free polyolefin layers.   The sealed structural deodorization according to any one of claims 1 to 12, wherein the polyolefin of the plastic layer containing the inner layer and the zeolite is a single substance or a combination of mixtures selected from polyethylene, ethylene elastomer, polypropylene and propylene elastomer. Sex packaging material.   The sealed structural deodorizing packaging material according to any one of claims 1 to 13, wherein the polyethylene is low-density polyethylene or ethylene-based elastomer.   The hermetically sealed deodorizing packaging material according to any one of claims 1 to 14, wherein the outer layer is selected from at least one of a deposited film and an aluminum foil.

Images