Collection bag and analysis method

Abstract

To provide a collection bag excellent in a gas barrier, strength of a seal part, and so forth, and obtained with an inexpensive material, and an analysis method using the same.SOLUTION: Provided is a collection bag having a port for injecting and / or discharging a sample, in which a bag body of the collection bag is composed of a biaxially stretched polyester film, the bag body being adhered by an adhesive film composed of a maleic anhydride-modified polyolefin resin to form a bag shape.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a collection bag and an analysis method. [Background technology]

[0002] 2. Description of the Related Art In many situations, such as sewage treatment plants, environmental analysis in factories, and exhaust gas analysis, it is common to collect analysis samples in collection bags and transport them to a location equipped with analytical equipment, such as an analytical laboratory, for subsequent analysis.

[0003] In such an analysis, it is necessary to collect a sample in a resin collection bag and transport the bag in a sealed state to the location of the analytical equipment. Examples of such collection bags are described in Patent Documents 1 and 2.

[0004] Such a resin-made collection bag is required to have a resin that is excellent in barrier properties, a low adsorption capacity for chemical substances, and excellent strength of the bag itself. In particular, the seal portion is likely to have poor strength, and even if a pinhole occurs in such a seal portion, it will affect the analysis results. Furthermore, since such a collection bag is required to be as inexpensive as possible, it is necessary to obtain a collection bag having the above-mentioned properties using inexpensive materials.

[0005] Furthermore, such a collection bag needs to be provided with a pouring outlet in order to collect samples and obtain samples during analysis. In conventional collection bags, such a pouring outlet is generally formed by sandwiching a film between resin molded bodies that serve as extraction ports from both sides of the bag and fixing them with screws. When a pouring outlet is provided in this manner, it is thought that the screws around the pouring port are likely to loosen, which makes it easy for gaps to form. In the case of a measurement sample that is partially or entirely gas or liquid, a problem occurs in that the sample leaks from such gaps.

[0006] Maleic anhydride modified polyolefin resin is known as an adhesive resin, and its use as a film-like adhesive is described in Patent Document 3. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2017-58253 A [Patent Document 2] JP 2009-128223 A [Patent Document 3] JP 2023-3079 A Summary of the Invention [Problem to be solved by the invention]

[0008] An object of the present invention is to provide a collection bag having a pouring outlet that does not cause the above-mentioned problems and that is made of inexpensive materials, and an analysis method using the same. [Means for solving the problem]

[0009] The present invention relates to a collection bag which is a bag body made of a barrier resin film and has an outlet for injecting and / or discharging a sample, the outlet being formed by adhering a spout made of a polyolefin resin to the barrier resin film via an adhesive film at the end of the collection bag body, and the barrier resin film is a biaxially oriented polyester film or a fluororesin film.

[0010] The adhesive film is preferably a maleic anhydride modified polyolefin resin film. It is preferable that the spout comprises a hollow tube having a screw thread at one end and a screw wing portion, which can be integrated together by tightening the screw. The sample is preferably gaseous, liquid, semi-solid or powder. The present invention also provides an analytical method comprising collecting a sample in the collection bag and then collecting the sample from the collection bag for analysis. Effect of the Invention

[0011] The collection bag of the present invention can be manufactured by a simple method using inexpensive materials, and has excellent adhesive strength and sealing ability, particularly in the vicinity of the pouring outlet. The analytical method using this is preferable in that it enables stable and accurate analysis. [Brief description of the drawings]

[0012] [Figure 1] FIG. 2 is a schematic diagram showing one embodiment of the collection bag of the present invention. [Diagram 2] FIG. 2 is a schematic diagram showing one embodiment of the collection bag of the present invention. [Diagram 3] FIG. 2 is a schematic diagram showing one embodiment of the collection bag of the present invention. [Figure 4] FIG. 4 is a schematic diagram showing a collection bag according to an embodiment. [Diagram 5] FIG. 2 is a schematic diagram showing the spout of the collection bag of the present invention. [Figure 6] FIG. 2 is a schematic diagram showing the shape of a measurement sample for a tensile test. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] The present invention will be described in detail below. The collection bag of the present invention has a pouring outlet formed by a specific method, which allows it to be produced inexpensively with excellent adhesion and airtightness.

[0014] The spout of the present invention is formed by a spout made of a polyolefin resin such as polyethylene or polypropylene. The spout is a general-purpose spout that is widely used in the field of food packaging containers, etc., and a general-purpose spout can also be used in the present invention.

[0015] The base film constituting the collection bag is a biaxially oriented polyester film or a fluororesin film. Many of these resins have poor sealing properties with polyolefins. Therefore, it is difficult to directly bond the film substrate and the spout. Furthermore, even when a sealable resin is laminated on a gas barrier resin film as in Patent Document 1, the sealable resin described in the document cannot sufficiently bond to the polyolefin resin.

[0016] In the present invention, a specific adhesive film is used to adhere the spout to the gas barrier film, thereby solving the above-mentioned problems. A collection bag having such a structure can be produced at low cost, has excellent adhesion and bonding properties, and is particularly suitable for use as a collection bag for various measurement samples. The materials used in such collection bags are described below.

[0017] (Gas barrier film) The substrate constituting the collection bag of the present invention is a biaxially oriented polyester film or a fluororesin film. Biaxially oriented polyester films and fluororesin films have excellent gas barrier properties, and are suitable for storing analysis samples because they do not adsorb various components to the film or generate outgassing.

[0018] The biaxially oriented polyester film is not particularly limited, and a commercially available general film can be used.

[0019] The fluororesin film is not particularly limited, and examples thereof include Tedlar (a trade name of DuPont) made of polyvinyl fluoride resin.

[0020] If necessary, the gas barrier film may be subjected to a surface treatment such as plasma treatment or corona discharge treatment at the adhesive portion or the entirety thereof.

[0021] The gas barrier film may be a single-layer biaxially oriented polyester film or a fluororesin film, or may further have other layers such as a metal layer or an EVOH film layer. As such a metal layer, an aluminum vapor deposition layer or the like is preferably used. The gas barrier film having an aluminum vapor deposition layer may be a two-layer film, or may have a three-layer structure with an aluminum vapor deposition layer as an intermediate layer. It may have a two-layer or three-layer or more layer structure having a layer configuration other than those described above.

[0022] (Adhesive film) In the present invention, a spout is adhered to a gas barrier film using an adhesive film, thereby forming a bag-shaped body having a spout. As described above, a spout is a well-known article, and it is widely practiced to adhere a spout to a bag made of a resin film to form a container for food or drink.

[0023] However, it is difficult to adhere such a spout to a gas barrier film that is difficult to seal with other materials. In the present invention, the inventors have investigated such points and found that such problems can be solved by adhering the spout and the gas barrier film using an adhesive film, and that a bag made of a gas barrier film and provided with a spout can be formed, which has led to the completion of the present invention.

[0024] By using this method of bonding, it is possible to use an adhesive without worrying about outgassing, and it is possible to achieve uniform bonding at the bonding site, thereby suppressing the occurrence of pinholes. Furthermore, there is no adhesion failure at the bonding site, and the contents of the sample stored in the capture bag of the present invention do not change during storage.

[0025] Furthermore, the collection bag obtained by this method can be easily disassembled by heating after use. This is also preferable in that each part can be reused by disassembling the bag by heating.

[0026] The adhesive film is preferably an adhesive film made of a maleic anhydride modified polyolefin resin.

[0027] The sheet-like film may be a single layer, or may be a multi-layer type in which maleic anhydride-modified polyolefin resin is formed on both sides of the base layer. The multi-layer type is preferable in that it can obtain the properties such as strength that a gas barrier film has. Furthermore, since no gas is generated during use, volatilization from the resin does not adversely affect the analysis.

[0028] Such a sheet-like film may be a commercially available product, such as Metaseal (registered trademark; Fujimori Kogyo Co., Ltd.).

[0029] The maleic anhydride modified polyolefin resin is a known polymer, and a resin modified by reacting a polyolefin resin such as a polypropylene resin or a polyethylene resin with maleic anhydride can be suitably used.

[0030] (Spout) The spout is a type that is widely used in pouch-shaped containers and the like, and its shape and the like are not particularly limited. Specifically, it is preferable that the molded resin product has holes through which gas or liquid can be injected or discharged. In order to be able to adhere to the resin film that constitutes the container, it is preferable that the molded resin product has wing parts as shown in Figures 1 to 5. This shape is preferable in that the contact area between the wing parts and the resin film becomes large, enabling strong adhesion.

[0031] A spout generally has a hollow cylindrical part made of resin. Samples can be collected and discharged through such a hollow cylinder. Specifically, a spout pouch, which is widely used in containers for food and drink, is preferably used.

[0032] When providing a spout which is such a resin molded body to a collection bag, a collection bag having a spout can be obtained by bonding the spout which is a resin part to the opening of the bag-shaped portion.

[0033] It is preferable that the end of the spout-equipped collection bag can be sealed. In other words, it is preferable that the contents of the sample collected in the collection bag are sealed until the measurement. For this reason, it is preferable that the bag can be sealed after the sample is collected.

[0034] Such a sealing method is not particularly limited, but an example thereof is a method in which a two-way valve is installed, and when collecting a sample, the two-way valve is opened to introduce the sample, and when the introduction is completed, the two-way valve is closed to seal the container.

[0035] Such a two-way valve may be directly attached to the spout, or may be connected to the spout with a tube and sealed by closing the two-way valve. As described above, the two-way valve may be detachable with a screw or the like. In this case, it may be possible to disassemble it after use and reuse only the two-way valve.

[0036] The spout may be plugged with a rubber plug made of silicone rubber, etc. In this case, when taking a sample for measurement, it is preferable to insert a syringe needle into the rubber plug and take the sample with the syringe.

[0037] The collection bag of the present invention may have two spout-type outlets. Having two outlets is preferable in that the inside of the bag can be replaced before collecting a sample. That is, the sample is introduced from one outlet and discharged from the other outlet, thereby replacing gas and the like present in the collection bag.

[0038] Specific embodiments of such a spout are shown in Figs. The spout shown in Figure 1 is a typical well-known spout. That is, it is made of a resin molded body in which a wing part for adhering to a film and a hollow part forming a spout are molded as one body. This is adhered to a resin film to make a repair bag with a spout. In the embodiment of Figure 1, a lid that can be attached and detached by a screw is provided at one end of the spout extraction port. This lid seals the collection bag to prevent leakage of the collected sample and the intrusion of external components.

[0039] The embodiment shown in Fig. 2 is a spout in which the spout and the wing are separate parts that are integrated with a screw. This is preferable because the hollow tube that forms the hollow part that forms the spout can be easily removed and reused after use.

[0040] The embodiment shown in Fig. 3 is a spout in the same manner as Fig. 2, in which the spout and the wing are separate parts that are integrated by a screw, and a valve is provided in the hollow tube that forms the spout.

[0041] That is, the spout shown in FIG. 3 is composed of a wing portion having a threaded hole, and a hollow tube having a threaded portion at one end and further having a valve in the middle portion.

[0042] As described above, the collection bag of the present invention is preferably sealed after the sample is introduced into the bag. Such sealing is most preferably performed by a valve. If the bag is sealed by a lid as in the embodiment of Fig. 1, it takes a certain amount of time to put the lid on, during which time the sample leaks out and outside air enters. In the case of a bag having a pouring outlet as in Fig. 2, it is further necessary to connect a sealing means for sealing the container separately or to close the opening with a film or the like.

[0043] In contrast to these methods, in the case of the embodiment shown in Fig. 3, the two-way valve is closed after the sample is introduced, so that the sample does not leak out and the outside air does not enter. Moreover, since this two-way valve is connected to the blade portion by a screw, it can be easily removed and reused after use. Since the two-way valve is a component that causes an increase in costs, making it reusable can achieve significant cost reductions.

[0044] (Collection bag) An example of the shape of the collection bag of the present invention is shown in FIGS. 1 and 2, a spout 1 is attached to a notch at the end of the bag, thereby providing a spout 3. The location of the spout is not particularly limited, but it is preferable to form a notch at one corner of the rectangular bag and provide the spout at that location.

[0045] Providing a spout at the corner is preferable because it makes it easier to remove the collected sample, particularly when the sample is liquid or semi-solid.

[0046] Since the collection bag of the present invention is used to store a measurement sample, it is preferable that the bag has a strong adhesive strength in order to prevent the sample from leaking and external components from getting in. Furthermore, it is preferable that the adhesive strength is high in order to prevent the bag from being torn even if the bag is exposed to various environments during sample transportation or is accidentally dropped by an operator.

[0047] (Method of manufacturing collection bag) The collection bag of the present invention can be produced by any method, for example, as described below, although there is no particular limitation on the production method thereof.

[0048] To make the film into a bag shape, it is necessary to seal three or four of the four sides of the rectangular shape. One of the four sides may be a folded-back portion of the film. The above-mentioned spout is provided at one of the sealed sides. The remaining two or three places can be bonded by heat sealing, or by sandwiching and bonding an adhesive film in the same manner as the portion where the spout is provided.

[0049] Even if the shape of the collection bag is a rectangle with a notch at one corner to make it a pentagon, it can be obtained by gluing all four sides or three sides other than the notch where the spout is to be provided.

[0050] When the biaxially oriented polyester film is used as a gas barrier film, it is preferable to bond the film by sandwiching the adhesive film and hot pressing it, since heat sealing cannot be performed. In this case, the adhesive strength is preferably 20 N / 10 mm or more. The adhesive strength here is measured by the method described in the examples.

[0051] As described above, in the spout installation area, the gas barrier film 5 / adhesive film 4 / spout 1 / adhesive film 4 / gas barrier film 5 are laminated in that order as shown in Figure 2, and the area can be heat pressed to adhere the films together.

[0052] When bonding, the bonding surfaces of the gas barrier film, the spout, and the sealable resin film may be previously subjected to surface treatment such as plasma treatment, corona discharge treatment, etc. Such treatment is preferable in that stronger bonding can be achieved and bonding can be performed with the above-mentioned strength.

[0053] When the gas barrier film is a fluororesin film, the films can be bonded to each other when producing a bag from the film by heat sealing the fluororesin films together. Such heat sealing can be performed by a general method. Note that the fluororesin films may be bonded to each other using the above-mentioned adhesive film.

[0054] (How to use the collection bag) Samples that can be collected using the collection bag of the present invention include gases, liquids, semi-solids, powders, and the like. That is, the bag can be particularly suitably used as a collection bag for samples that contain gas or liquid in part, in addition to gas samples.

[0055] It is particularly suitable for use as a collection bag for gas samples. It can also be used as a collection bag for liquids and slurries containing liquids. Such liquid samples often contain gas components in part, and it is often required to analyze the gas components at the same time during analysis. Therefore, a collection bag with excellent sealing properties such as that of the present invention can be used preferably.

[0056] In addition, when liquid components are placed in a collection bag, leakage or adsorption to the film can lead to poor analysis. Furthermore, the weight of the sample applied to the adhesive portion can easily cause problems such as peeling of the seal and the formation of pinholes. For this reason, this method is particularly suitable for use in such fields.

[0057] More specifically, the collection bag of the present invention can be used in various analyses of gases, sludge, wastewater, etc., such as environmental analyses in sewage treatment plants and factories, and exhaust gas analyses. EXAMPLES

[0058] The present invention will be specifically described below based on examples. However, the present invention is not limited to the following examples. In the following examples, "parts" and "%" respectively mean "parts by mass" and "% by mass" unless otherwise specified.

[0059] Example 1 Two pieces of biaxially oriented polyester cut into the shape shown in Fig. 4 were prepared, and a piece of Metaseal (registered trademark: manufactured by Fujimori Kogyo Co., Ltd.) cut into a predetermined shape was sandwiched between the adhesive parts at the periphery. Furthermore, a spout made of polyethylene was sandwiched in the approximate center of the notch at the corner, resulting in a configuration of biaxially oriented polyester / Methaseal / spout / Methaseal / biaxially oriented polyester. In this state, each piece was bonded by hot pressing to produce the collection bag of the present invention.

[0060] Comparative Example 1 Two square pieces of biaxially oriented polyester film measuring 350 mm x 350 mm were prepared and stacked together. The four sides were then fused together by heat melting. A hollow tube consisting of two parts whose middle part can be tightened with a screw was prepared, and this was installed by drilling a hole near the middle part of one side and tightening the screw.

[0061] (evaluation) (Airtightness test) The test was conducted using Seal Check, manufactured by Mitsubishi Gas Chemical Company. The Seal Check is a colored liquid filled in a spray can, which is sprayed on the sealed area and left for a while to check the state of penetration and leakage of the colored liquid into the sealed area. In the sample of the embodiment, no penetration of the liquid into the sealed area was observed. Similarly, no penetration of the liquid was observed in the sealed area of ​​the periphery or in the vicinity of 1 in FIG. 4 where the pouring outlet is provided. On the other hand, in the comparative sample, liquid penetration was observed at the sealed portion of the periphery, and it was confirmed that the sealing performance was insufficient.

[0062] (Durability test) The container of Example 1 was filled with 750 ml of water and subjected to drop tests at heights of 80 cm and 100 cm with the lid closed. The tests were performed three times, and the presence or absence of water leakage was checked after the tests. In these drop tests, no water leakage occurred, and it was clear that sufficient strength was obtained.

[0063] (Tensile test) Measurements were performed using an Analogue Force Gauge NK-100 manufactured by Japan Measurement Systems. A measurement sample was obtained by cutting the bag periphery near the sealed portion into the shape shown in Figure 4. The two points shown as clamping portion 5 in Figure 4 were fixed to the sample fixing portion of the device and a tensile test was performed. The breaking strength at the time of breakage was measured. The measurement was performed five times, and the average value was 20 N / cm 2 This clearly shows that sufficient seal strength was obtained.

[0064] The collection bag of the present invention has excellent strength in the adhesive joints and is less susceptible to pinholes, thereby enabling the sample to be stably sealed. [Industrial Applicability]

[0065] The collection bag of the present invention can be used for the purpose of collecting a sample to be analyzed. [Explanation of symbols]

[0066] 1 Spout 2 Adhesive part 3 spout 4. Base film 5. Adhesive Film 6 Clamp position in tensile test

Claims

1. A collection bag made of a barrier resin film and having an outlet for injecting and / or discharging a sample, The spout is formed by adhering a spout made of a polyolefin resin to a barrier resin film via an adhesive film at an end of the collection bag body, The collection bag is characterized in that the barrier resin film is a biaxially oriented polyester film or a fluororesin film.

2. 2. The collection bag according to claim 1, wherein the adhesive film is a maleic anhydride modified polyolefin resin film.

3. 3. The collection bag according to claim 1, wherein the spout comprises a hollow tube having a screw thread at one end and a wing having a screw thread, which can be integrated together by tightening the screw.

4. 3. The collection bag according to claim 1 or 2, wherein the sample is a gas, liquid, semi-solid or powder.

5. 3. An analytical method comprising the steps of: collecting a sample in the collection bag according to claim 1 or 2; and then collecting the sample from the collection bag for analysis.

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