JP2013051992A - Sealed structure type water absorption slide fastener - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealed structure type water absorption slide fastener with a high sealing properties capable of suppressing water permeability into a packaging material and keeping an atmosphere of a content in a dried state.SOLUTION: The sealed structure type water absorption slide fastener 60 includes a plastic slide fastener part 60 inside the periphery of an opening 52 of a bag body 50 for sealing the opening 52 formed so as to extend the opening 52 in a crossing direction. The slide fastener part 60 includes a pair of plastic films 72 and 74 laminated inside and slide fasteners 70 and 71 formed in the pair of plastic films 72 and 74. The pair of plastic films 72 and 74 and/or slide fasteners 70 and 71 are formed of plastic containing a zeolite.

Description

  The present invention relates to a sealed structure type water absorption chuck.

Conventionally, packaging materials for fresh foods have been filled with inert gas such as nitrogen or oxygen inside the packaging materials containing 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 ingredients, liquid seasonings, etc. are boiled or retort heat treated to produce a sterilized or sterilized packaging product that is useful as a packaging bag.

JP 2007-022558 A

However, in such a packaging material with a chuck in which a general chuck part is formed at the opening of such a bag base, when the pressure inside the bag base is reduced, air gradually leaks from the chuck part and the inside of the bag base The reduced pressure state is not maintained.
In addition, there is a desire to suppress as much as possible a small amount of moist air entering the inside of the bag base from the chuck portion of the opening.
Recently, there have been reports of cases where foods etc. are stored inside the bag substrate and mite invades from the chuck part, and the foods are in an unsanitary state that causes allergies. Yes.

  An object of the present invention is to provide a watertight chuck with a high hermeticity capable of suppressing moisture permeation into the packaging material and maintaining the atmosphere of the contents in a dry state.

  The sealed structure type water-absorbing chuck according to the present invention includes a plastic chuck portion that seals the opening formed so as to extend in a transverse direction across the opening on the inner side in the vicinity of the opening of the bag-shaped main body. . The chuck portion includes a pair of plastic films laminated on the inside so as to extend in the transverse direction, and a chuck formed on the pair of plastic films so as to extend in the transverse direction. The pair of plastic films and / or the chuck is made of a plastic containing zeolite.

  Moreover, it is preferable that the said chuck | zipper part has another chuck | zipper further formed in the said opening part side rather than the said chuck | zipper of a pair of said plastic film so that it may extend in the said cross direction. Each of the pair of plastic films preferably has a through hole formed between the chuck and the another chuck.

According to the present invention, the sealed structural water-absorbing chuck is formed on the inner side in the vicinity of the opening of the bag-shaped body so that the sealed-structure water-absorbing chuck extends in a transverse direction across the opening. The space portion can be kept in a sealed state, and moisture permeation into the bag-like body can be suppressed by the outer layer.
Further, since the pair of plastic films has a hygroscopic plastic layer containing zeolite and polyolefin, the moisture in the space formed by the chuck of the pair of plastic films and the bag-like body in the vicinity of the pair of plastic films Absorbs moisture in the space.
As a result, the atmosphere in the space formed by the pair of plastic film chucks is dried, and the pressure in the space is reduced. When the space portion is depressurized, the chuck is more closely engaged.

  Further, since the chuck portion has a moisture absorption function, it is sandwiched between a space portion formed by the chuck (for example, space portion R in FIG. 1) and a pair of plastic films between the chuck and another chuck. The atmosphere of the space portion (for example, the space portion Q in FIG. 1) is made dry. For this reason, even if ticks or the like try to enter from the chuck portion, there is a space portion in the dry state in the middle of entry, so the ticks do not enter the space portion because they hate the dry state. Even if ticks or the like invade the dry space, the invading ticks or the like are killed by drying and do not reach the inside of the bag-like body. For this reason, a chuck | zipper part acts effectively in the penetration | invasion prevention to the preservation | save thing preserve | saved inside the bag-shaped main body.

  Therefore, according to the present invention, it is possible to provide a watertight chuck with a high hermeticity capable of suppressing moisture permeation into the packaging material and maintaining the atmosphere of the contents in a dry state.

  The moisture-absorbing wrapping material provided with the sealed structure type water-absorbing chuck of the present invention is suitable for packaging and storage of materials in which the presence of moisture or moisture in the environment is not preferable. Moisture-absorbing wrapping materials equipped with a sealed structure-type water-absorbing chuck are, for example, materials that are easily altered by moisture or moisture, i.e., pharmaceuticals, cosmetics, dried foods, chemical substances, etc. It is suitable as a packaging material for storage and transportation of Li-battery-related electrodes and materials, metal machines and devices that are prone to rust, precision devices and electronic components that are prone to malfunction.

1 is a partial cross-sectional view of a sealed structure type water absorbing chuck according to the present invention. It is the elements on larger scale of the sealing structure type water absorbing chuck shown in FIG. It is a partial cross section figure which shows the state which absorbed the moisture of the sealing structure type water absorbing chuck shown in FIG. It is the elements on larger scale of another chuck of the sealed structure type water absorption chuck concerning the present invention. It is the elements on larger scale of another chuck | zipper of the sealing structure type water absorbing chuck which concerns on this invention. It is the elements on larger scale of another chuck | zipper of the sealing structure type water absorbing chuck which concerns on this invention. It is the elements on larger scale of another chuck | zipper of the sealing structure type water absorbing chuck which concerns on this invention. It is the elements on larger scale of another chuck | zipper of the sealing structure type water absorbing chuck which concerns on this invention. It is a graph which shows the result of having measured the time-dependent change of the weight of a sealing structure type water absorbing chuck.

  Referring to FIG. 1 and FIG. 2, the moisture absorption packaging material 10 with a sealed structure-type water absorption chuck including a chuck portion 60 which is a sealed structure-type water absorption chuck includes a bag-like main body 50 and an inner side in the vicinity of the opening 52. And a plastic chuck portion 60 which is formed so as to extend in the transverse direction X across the opening 52 and seals the opening 52. The chuck unit 60 includes two chucks 70 and 71. 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.

(Bag-shaped body)
The bag-like main body 50 is constituted by two laminated films 40 each having a moisture-impermeable outer layer 20 and a polyolefin inner layer 30. The bag-shaped main body 50 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.
Although the material of the bag-shaped main body 50 is not specifically limited, For example, a general polyolefin packaging material may be sufficient, and the functional packaging material which has moisture absorption capability may be sufficient. In order to exhibit the moisture absorption effect more effectively, it is preferable that this sealed structure type water absorption chuck is combined with a packaging material having moisture absorption performance. The outer layer 20 constitutes, for example, a surface layer of the laminated film 40 and includes a plastic layer 22 and an aluminum foil layer 24. When the inner layer 30 is a packaging material having moisture absorption performance, the inner layer 30 includes, for example, a hygroscopic plastic layer 32 containing zeolite and containing polyolefin, and a pair of zeolite-free polyolefin layers 34 containing polyolefin without containing zeolite. , 34, and the pair of non-zeolite-containing polyolefin layers 34, 34 are preferably laminated on both sides of the hygroscopic plastic layer 32 so as to sandwich the hygroscopic plastic layer 32 therebetween.

(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 films 72 and 74 in the direction Y perpendicular to the transverse direction X.
The chucks 70 and 71 include a pair of plastic films 72 and 74 laminated inside the opening 52 so as to extend in the transverse direction X, and a pair of female claws formed on the plastic film 72 so as to extend in the transverse direction X. 82, 83, a pair of male claws 84, 85 formed on the plastic film 74 so as to extend in the transverse direction X, and a seal portion 88 comprising a pair of seal portions 86, 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 films 72 between the female hook claw 82 and the female hook nail 83 so as to extend in the transverse direction X. The seal portion 87 is formed on the plastic film 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 films 72 and 74 and / or the chucks 70 and 71 are formed of a plastic containing zeolite.
In particular, the pair of plastic films 72 and 74 preferably has hygroscopic plastic layers 72a and 74a containing zeolite and containing polyolefin.
Further, it is more preferable that the pair of plastic films 72 and 74 in 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 moisture in the space portion R formed by the chucks 70 and 71 of the pair of plastic films 72 and 74 and the moisture in the bag side portion P and the space portions Q and R in the bag-shaped main body 50 in the vicinity of the pair of plastic films 72 and 74 are removed. Absorb.
As a result, the atmosphere of the space portion R formed by the chucks 70 and 71 of the pair of plastic films 72 and 74 is dried, 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 films 72 and 74 have through holes 75 and 76 formed between the chuck 70 and the chuck 71, respectively. Since the hygroscopic plastic layers 72a and 74a of the plastic films 72 and 74 are exposed from the through holes 75 and 76, respectively, the hygroscopic plastic layers 72a and 74a are located between the two seal portions 88 (in other words, the chuck). It is possible to absorb moisture in the space portion Q (between 70 and the chuck 71). That is, by absorbing moisture in the space portion Q formed in the chuck portion 60, moisture is absorbed in the chuck portion 60, so that the moisture absorption effect of the bag side portion P of the bag-like main body 50 is more efficiently maintained. be able to.
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 hygroscopic plastic layers 72a and 74a and the zeolite-free polyolefin layers 72b and 74b used in the plastic films 72 and 74 can be selected from those in the range of 0.880 to 0.960 g / ml. Furthermore, the moisture absorption rate can be improved by making the density of the polyolefin of the hygroscopic plastic layers 72a and 74a lower than the density of the polyolefin of the non-zeolite-containing polyolefin layers 72b and 74b.
The hygroscopic plastic layers 72a and 74a are preferably made by kneading zeolite into polyethylene or ethylene elastomer.
The polyolefin of the hygroscopic 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 hygroscopic plastic layers 72a and 74a and the non-zeolite-containing 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 non-zeolite-containing 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.

For the hygroscopic plastic layers 72a and 74a, it is preferable to use a zeolite having a pore diameter of 3 to 10 mm, and more preferably, a zeolite having a pore diameter of 3 to 4 mm. For the hygroscopic plastic layers 72a and 74a, it is preferable to use zeolite having a pore diameter of 3 to 4 mm for the hygroscopic plastic layers 72a and 74a so that only water molecules can be adsorbed.
For example, zeolite having a pore diameter of 3 to 4 can be a zeolite having a crystal structure of A type and a metal cation of an alkali metal and / or an alkaline earth metal. Two or more kinds of metal cations may be used. The metal cation is preferably a molecular sieve which is preferably an alkali metal, particularly preferably potassium or sodium.

  When the content of zeolite in the hygroscopic plastic layers 72a and 74a exceeds 50% by mass, film formation is possible, but flexibility as a molded product is lost. On the other hand, when the content is less than 1% by mass, the hygroscopic ability of the zeolite is sufficiently high. It is not demonstrated. The zeolite content of the hygroscopic plastic layers 72a and 74a can be appropriately selected depending on the amount of moisture to be dehumidified. The zeolite content is preferably 1% by mass to 50% by mass. The zeolite content is more preferably 10% by mass to 40% by mass.

  The plastic films 72 and 74 are translucent films by mixing zeolite into the hygroscopic plastic layers 72a and 74a. The refractive index of the plastic films 72 and 74 depends on the moisture absorption of the hygroscopic plastic layers 72a and 74a. Changes, and the translucent film changes to transparent as it absorbs moisture, so that the moisture absorption state can be determined. By utilizing this function, a film having a hygroscopic indicator function can be obtained. In particular, when a transparent material such as a silica-deposited PET film is used, it is possible to determine the moisture absorption state from outside the outer layer 20. If the transparent part is colored, the indicator function becomes clearer.

  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 72 and pressed against the clamping wall 92. The cross section of the fastening wall 92 forms a continuous groove that becomes wider as the distance from the plastic film 74 on which 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 moisture absorption wrapping material 10 with the sealed structure type water absorption chuck 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 72 is provided with pressing ribs 93 inside the female claws 82 and 83 and the male claws 84 and 85. The plastic film 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 moisture absorption packaging material 10 with the above-described sealed structure type water absorption chuck is filled with the contents and the opening 52 is sealed with the chucks 70 and 71 so that the seal portion 88 and the pair of lock portions are sealed. 90 and 91 are formed between a pair of plastic films 72 and 74, keep the bag-shaped main body 50 in a sealed state, and suppress moisture permeation into the bag-shaped main body 50 by the outer layer 20, thereby The atmosphere in the main body 50 can be maintained.

  Furthermore, since the hygroscopic plastic layer 32 of the inner layer 30 absorbs moisture in the bag-shaped main body 50 in a state where the opening 52 is sealed with the chucks 70 and 71, the atmosphere in the bag-shaped main body 50 is in a dry state. At the same time, the pressure in the bag-shaped main body 50 is reduced. When the pressure in the bag-shaped main body 50 is reduced, the two laminated films 40 constituting the bag-shaped main body 50 are in close contact with the contents. At this time, as shown in FIG. 3, the pair of plastic films 72 and 74 (ranges A and B in FIG. 3) closer to the bag side portion P than the chuck 70 are close to each other (in FIG. 3, the arrows In the direction of F). 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 areas A and B in FIG. 3 are bent so as to approach each other, the plastic films 72 and 74 in the area 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 films 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 72 and the plastic film 74 are not separated from each other. 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.

  The chuck of the moisture-absorbing material with the sealing structure type chuck is not limited to the above-described 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.

  Next, the sealed structure type water-absorbing chuck will be specifically described with reference to examples.

Example 1
60 kg of hydrophilic zeolite and 140 kg of low density polyethylene (LDPE) with a density of 0.919 g / ml and MFR (190 ° C., 2.16 kg) of 8 are kneaded and extruded using a die with a die diameter of 4 mmφ × 4 holes. LDPE pellets containing 30% zeolite were obtained.
Then, using this pellet and low density polyethylene (LDPE) having a density of 0.926 g / ml and MFR (190 ° C., 2.16 kg) of 0.9, a pair of plastic films is made of low density polyethylene containing zeolite ( LDPE), the male claws and female claws of the chuck were coextruded so as to be low-density polyethylene (LDPE) containing no zeolite to form a sealed structure type water-absorbing chuck.

(Comparative Example 1)
A sealed structural chuck was formed in the same manner as in the example except that zeolite was not mixed.

(Evaluation)
The following water absorption evaluation was performed on the sealed structure type water absorbing chuck of the example and the sealed structure type chuck of the comparative example.
(Water absorption evaluation)
The sealed structural water-absorbing chuck of Example 1 and the sealed structural chuck of Comparative Example 1 were cut to a size of 1 cm × 1 cm to prepare test pieces, and the weights of these test pieces were measured. These test pieces were placed in a constant temperature and humidity box of 25 ° C. and RH 100%, the change in the weight of these test pieces over time was measured, and the adsorption performance (%) with respect to the added amount of zeolite was calculated. Although it was confirmed that the test piece of Example 1 had an adsorption performance close to that of the added zeolite, the adsorption performance of the test piece of Comparative Example 1 was hardly recognized. FIG. 9 shows the results of changes over time in the adsorption performance with respect to the calculated amount of added zeolite. In FIG. 9, the adsorption performance with respect to the added amount of zeolite is 100% when water is absorbed equivalent to the adsorption performance of the added zeolite.

DESCRIPTION OF SYMBOLS 10 Moisture-absorbing wrapping material 20 with sealing structure type water absorption chuck 20 Outer layer 22 Plastic layer 24 Aluminum foil layer 30 Inner layer 32 Hygroscopic plastic layer 34 Zeolite-free polyolefin layer 40 Laminated film 50 Bag-shaped main body 52 Opening 60 Chuck part (sealing structure Type water absorption chuck)
70, 70a, 70b, 70c, 70d, 70e, 71 Chuck 72, 74 Plastic film 72a, 74a Plastic film hygroscopic plastic layer 72b, 74b Plastic film zeolite-free polyolefin layer 75, 76 Plastic film through-hole 82, 83 Female claws 84, 85 Male claws 86, 87 Seal portion 88 Seal portion 89 Independent wall 90, 91 Lock portion 92 Clamping walls 93, 93a, 93b, 93c Pressing ribs 93d, 93e Clamping walls 94a, 94b Lock presser 95 Recess

Claims (17)

A plastic chuck portion for sealing the opening formed so as to extend in a transverse direction across the opening on the inner side in the vicinity of the opening of the bag-shaped main body,
The chuck portion includes a pair of plastic films laminated on the inside so as to extend in the transverse direction,
A chuck formed on the pair of plastic films so as to extend in the transverse direction,
The pair of plastic films and / or the chuck is formed of a plastic containing zeolite, and has a sealed structure type water absorption chuck.   The sealed structure type water-absorbing chuck according to claim 1, wherein the plastic containing zeolite is polyolefin.   The sealed structural water-absorbing chuck according to claim 2, wherein the polyolefin has a density of 0.880 to 0.960 g / ml. The chuck portion further includes another chuck formed on the opening side from the chuck of the pair of plastic films so as to extend in the transverse direction.
4. The sealed structure type water-absorbing chuck according to claim 1, wherein each of the pair of plastic films has a through-hole formed between the chuck and the another chuck. 5.   The chuck includes a pair of female claws formed on one of the pair of plastic films so as to extend in the transverse direction and a pair of males formed on the other of the pair of plastic films so as to extend in the transverse direction. 5. The hermetically sealed water-absorbing chuck according to claim 1, further comprising a pair of male claws that are hook claws and 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 water-absorbing chuck according to claim 5, wherein the other of the pair of seal portions is formed on the other of the pair of plastic films between the pair of male claws so as to extend in the transverse direction. The one claw of the pair of plastic films 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-shaped fastening wall formed in a plastic film;
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. Sealing structure type water absorption chuck as described.   The sealed structural water-absorbing chuck 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 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 water absorption chuck.   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 structure type water-absorbing chuck 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. A sealed structure type water-absorbing chuck according to any one of claims 7 to 10.   The sealed structure type water-absorbing chuck according to any one of claims 1 to 11, wherein the polyolefin is a single substance or a combination of mixtures selected from polyethylene, ethylene-based elastomer, polypropylene, and propylene-based elastomer.   The sealed structure type water absorbing chuck according to any one of claims 1 to 12, wherein the polyethylene is low-density polyethylene or ethylene-based elastomer.   The sealed structural water-absorbing chuck according to any one of claims 1 to 13, wherein the pair of plastic films and / or the chuck is made by kneading zeolite into polyolefin.   The sealed structure type water-absorbing chuck according to any one of claims 1 to 14, wherein a pore diameter of the zeolite in the plastic layer containing the pair of plastic films and / or the zeolite in the chuck is 3 to 10 mm.   The hermetically sealed water-absorbing chuck according to any one of claims 1 to 15, wherein a content of zeolite in the plastic layer containing zeolite in the pair of plastic films and / or the chuck is 1 to 50% by weight.   The pair of plastic films and / or the chuck has an indicator function of changing a refractive index of the plastics of the pair of plastic films and / or the chuck according to moisture absorption of the plastic layer containing zeolite. The sealed structure type water-absorbing chuck according to any one of the above.

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