JP2008056277A - Packaging material for seed, and bag for seed - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packaging material for seed and a bag for seed having good gas barrier properties and capable of observing a content from the outside. <P>SOLUTION: The packaging material for seed is constituted by laminating a plastic base film 10, a resin barrier layer 20, and a heat seal layer 30. The packaging material for seed has a printed layer between the plastic base film 10 and the resin barrier layer 20, and the printed layer 50 has a window opening part printed in the color lighter than that of the outer periphery. The bag for seed formed of the packaging material for seed has very good clearness and preservability, good information presentation of contents, and steam barrier properties. Thus, the bag is formed of a laminate having excellent preservability of seed, and also has flexibility, impact resistance, friction resistance, printing suitability, openability and filling and packaging suitability capable of protecting the content. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a seed wrapping material whose contents can be observed from the outside, and a seed bag formed by molding the seed wrapping material.

  An increasing number of people enjoy planting gardens by putting planters on verandas or renting farms, and various vegetables and flower seeds stored in small bags are on the market. As such a seed wrapping material, paper or a bag-like material having a resin coating on its surface is often used, and it is common to print a picture or a photograph of seeds or florets on the surface.

In addition, as a seed storage method, there is a method in which plant seeds are sealed in a non-breathable container together with an oxygen scavenger and stored at a temperature of 30 ° C. or less, and the oxygen permeability is 50 ml / m ² · atm · d or less. A method of storing seeds in a bag made of a packaging material is disclosed (Patent Document 1). The publication discloses a film in which vinylidene chloride or vinylidene chloride is laminated as the packaging material having the oxygen permeability.

In addition, it is necessary to disclose information such as seed type, planting time, management method, harvest time, etc. for seed wrapping materials. Usually, packaging materials made of paper base materials or paper base materials are coated with resin. In order to suppress oxygen ventilation, a packaging material in which an aluminum foil or the like is coated on a paper base material is often used.
JP 58-220611 A

  It is necessary to disclose a lot of information on the surface of the seed bag. Packaging materials made from paper base materials or paper base materials coated with resin can be printed easily on paper base materials. Information can be disclosed. However, since a paper base material is used, the contents cannot be observed from the outside of the packaging material. In addition, since the seed bags used in the kitchen garden are small bags, vegetables and florets at harvest time are generally printed, and the seeds are rarely printed, even if there are pictures, they are reduced and posted. There is a case. For this reason, it is convenient if the seeds can be observed directly without opening the bag, and if the contents can be confirmed directly, the enjoyment of the home garden increases and the consumer's willingness to purchase also improves.

  In addition, the seed bag needs to disclose information for each lot, such as the production location, germination rate, expiration date, and lot number. Therefore, it is convenient if such information can be easily written in a bag for each lot separately from printing general information such as seed name, soil type, sowing time, and sowing amount.

  In addition, if excessive water vapor is present during seed storage, the seeds are steamed in the bag, and fermentation and rot progress, making it difficult to maintain the quality of the seeds. For this reason, the water vapor barrier property is also an important factor as a characteristic of the film-like seed packaging material used when producing the seed bag. Moreover, the strength which can protect the contents physically is necessary for using as a seed bag. However, when a metal foil such as an aluminum foil is used, the water vapor barrier property is excellent, but pinholes are easily generated, and as a result, the gas barrier property may be significantly impaired. Further, when incineration is performed as waste after use, the incineration suitability is inferior, and there is a problem that disposal after use is not easy. In addition, since vinylidene chloride and the like described in Patent Document 1 contain chlorine atoms in its structure, harmful chlorine gas is generated when incinerated as garbage after use, which is not preferable for environmental hygiene. Therefore, for seeds that have excellent gas barrier properties and safety after use, and that can protect the contents physically, have moderate flexibility, impact resistance, friction resistance, printability, openability, filling packaging suitability, etc. Wrapping materials and seed bags produced from such seed packaging materials are desired.

  In view of the above, an object of the present invention is to provide a seed wrapping material that is excellent in printability, has water vapor barrier properties, and allows the contents to be seen from the outside.

  Another object of the present invention is to provide a seed packaging material and a seed bag that can be easily disposed of after use.

  Furthermore, an object of the present invention is to provide a seed wrapping material and a seed bag having flexibility, impact resistance, friction resistance, printability, openability and filling / packaging suitability that can protect the contents. .

  As a result of examining the packaging material for seeds in detail, the present inventor constituted the packaging material for seeds with a laminated material having excellent gas barrier properties, and provided a printed layer between the layers constituting the laminated material, thereby providing a printed layer. The contents can be confirmed from the outside of the seed bag if it can be protected without being in contact with the outside, and the printed layer is printed by forming a window part with a white reflection density of 0.1 to 0.3. In addition, when the window opening portion has the above-described transparency, it is found that the printing can be easily read even when printing different from the print layer such as lot information is performed on the window opening portion. Was completed.

That is, the first of the present invention is a seed packaging material in which a plastic base film, a resin barrier layer, and a heat seal layer are laminated,
The seed wrapping material has a printing layer between the plastic base film and the resin barrier layer and / or between the resin barrier layer and the heat seal layer, and the printing layer is more than the outer periphery. A seed packaging material having a window opening printed in a light color and having a white reflection density of 0.1 to 0.3.

  A second aspect of the present invention is a seed bag formed by molding the seed packaging material into a bag shape.

  The seed wrapping material of the present invention has a window opening portion with a white reflection density of 0.1 to 0.3 printed in a lighter color than the outer periphery, so the contents can be directly visually observed through the window opening portion. Can do. Moreover, since the white reflection density of the window opening is 0.1 to 0.3, the printed contents can be easily read even when the lot number is printed from the outside of the seed bag. Confirmation of contents and acquisition of lot information can be performed simultaneously by one window provided in the material.

  In addition, since the plastic packaging film is laminated on the resin barrier layer, the seed wrapping material of the present invention is excellent in gas barrier properties and mechanical strength, chemical strength, and the like.

  In the seed packaging material of the present invention, since the printing layer is provided between the layers constituting the seed packaging material, the printing layer is not in direct contact with the outside, and has a clear printed surface. Excellent protection.

  Hereinafter, the seed packaging material and seed bag of the present invention will be described in detail.

(1) Seed wrapping material The seed wrapping material used in the present invention is one in which at least a resin barrier layer and a heat seal layer are laminated, and a plastic substrate film is laminated on the resin barrier layer. By having the plastic substrate film in the outermost layer, the mechanical, physical, and chemical strengths as the seed wrapping material can be ensured, whereby the above strength can be ensured.

  In the present invention, in addition to the above constituent layers, other layers may be included. Such other layer is a surface treatment layer, for example, an adhesive layer for laminating for laminating each layer by a dry laminating method, a primer layer when laminating a heat seal layer by a melt extrusion method, There are anchor coat layers and other undercoat agent layers.

  The seed wrapping material used in the present invention has a printed layer on the plastic substrate film and / or the resin barrier layer, or a surface treatment layer thereof. Surface treatment suitable for clear printing includes plasma treatment, corona discharge treatment, ozone treatment, low-temperature plasma treatment, glow discharge treatment, etc., and is formed by applying primer, anchor coat, undercoat, and laminating adhesive. A printed layer can also be formed on the formed layer.

  Therefore, as a seed packaging material of the present invention including a plastic substrate film, for example, (a) <plastic substrate film / corona treatment layer / printing layer> / laminate adhesive layer / <corona treatment layer / resin barrier Layer> / adhesive layer for laminating / <corona treatment layer / heat seal layer>, (b) <plastic base film / corona treatment layer> / adhesive layer for laminating / <corona treatment layer / resin barrier layer / printing layer > / Laminate adhesive layer / <Corona treatment layer / Heat seal layer>, (c) <Plastic substrate film / Corona treatment layer> / Laminate adhesive layer / <Corona treatment layer / Resin barrier layer / Plasma treatment layer> / Printing layer> / adhesive layer for laminating / <corona treatment layer / heat seal layer>, (d) <plastic substrate film / corona treatment layer> / adhesive for laminating / <Corona treatment layer / resin barrier layer / primer layer / printing layer> / laminate adhesive layer / <heat seal layer>, (e) <plastic substrate film / corona treatment layer> / laminate adhesive layer / < Examples include corona-treated layer / resin barrier layer / primer layer / printing layer> / laminate adhesive layer / <corona-treated layer / heat seal layer>. Before forming the adhesive layer for laminating, a primer layer may be formed in advance, an anchor coating agent layer is provided in place of the laminating adhesive layer, and a heat seal layer is formed by a melt extrusion method. Also good.

  FIG. 1 shows a seed wrapping material in which a plastic base film, a resin barrier layer, and a heat seal layer are laminated, and the seed wrapping material has a printing layer between the plastic base film and the resin barrier layer. A cross-sectional view is shown.

  1 shows a heat seal layer (30) having a printed layer (50), a resin barrier layer (20), and a corona treatment layer (80) after a corona treatment layer (80) is provided on a plastic substrate film (10). ) Is a cross-sectional view of a seed wrapping material bonded through a laminate adhesive layer (70).

  In the present invention, the printed layer (50) is printed such that a window portion (120) printed in a lighter color than the outer periphery is formed. FIG. 2 shows a seed bag prepared using the seed wrapping material (100). The window opening (120) is provided on either the front surface or the back surface of the seed bag, and this window opening ( 120) through which the contents can be observed.

(2) Plastic substrate film The plastic substrate that can be used in the present invention is excellent in mechanical, physical, and chemical strength sufficient for the use of the seed packaging material of the present invention. Resins that are excellent in pinhole property, puncture resistance, etc., can ensure a white reflection density in the window opening portion of 0.1 to 0.3, and can be printed on the surface can be widely used. . For example, at least one of a polyester resin, a polyamide resin, a polyaramid resin, a polypropylene resin, a polycarbonate resin, a polyacetal resin, a fluorine resin, and the like can be suitably used. In the present invention, a polypropylene resin can be particularly preferably used. It is preferable that the seed bag can be self-supporting when it is marketed, and if it is a polypropylene resin, it is excellent in mechanical and chemical strength and can give such a waist. Moreover, since the surface is glossy, the appearance of the seed bag can be improved. Further, printing by printing can be easily performed.

  In the present invention, the plastic substrate film may be any of an unstretched film of the resin and a film stretched in a uniaxial direction or a biaxial direction. In the present invention, it is particularly preferable to use a stretched nylon film, a biaxially stretched polyethylene terephthalate film or a biaxially stretched polypropylene film.

  In the present invention, the thickness of the plastic substrate film is not particularly limited as long as strength, puncture resistance, rigidity and the like can be ensured, but is preferably 6 to 100 μm, more preferably 9 to 50 μm.

(3) Printed layer In this invention, a printed layer is provided in a plastic base film or a resin barrier layer, or these surface treatment layers. The printing method is not limited, but gravure printing is preferred. Gravure printing is a type of printing method in which the ink-applied portion of the original plate is engraved in a concave shape. In recent years, this concave portion is digitally formed by an etching machine equipped with a diamond laser. Since the ink comes out of the recess, the color density can be adjusted by the depth and size of the ink, the pressure of the recess on the printing layer, and the like. The gravure printing machine has one printing unit for each color and is excellent in reproducibility of images having gradation such as photographs. In order to print on a plastic film with such a gravure printing machine, it is common to perform backside printing on the side opposite to the side on which characters are viewed in order to prevent the printed layer from peeling off. In this order, for example, in order of black, indigo, red, and yellow, printing starts with light ink such as white ink. The entire surface printing with a light color ink such as white ink prevents the contents from being seen through, and the color printing layer provided between the light color ink such as the white ink and the plastic film can be made clear. It is. In the present invention, the printing layer is preferably white ink printing among the light inks as the uppermost layer of the printing layer, similarly to the above-described back surface printing. In the case of light ink, even when individual printing such as a lot number is performed on the window opening portion from the outside, the printed content can be easily read. Moreover, it excels in the effect which cuts out all the light rays containing an ultraviolet-ray, and is excellent also in the preservability of a seed. In this case, the order of the other color inks is not limited, but it is preferable that printing is performed in the order of black, indigo, red, and yellow, and printing with the special color ink blended at a specific ratio after yellow may be repeated. In the present invention, the light color ink means one having high brightness, and means a mixture of white ink as a main component and other color inks.

  FIG. 3 illustrates a method of forming a window opening portion printed on the printed layer in a lighter color than the outer periphery in the printing order in the corona treatment layer (80) of the plastic substrate film (10). First, in FIG. 3, black (51), indigo (52), red (53), yellow (54) and specific ink (55) are printed on the outer peripheral portion (57) other than the window opening portion (58), The window opening (58) is formed with a window opening (58) that is not printed with black, indigo, red, yellow and special color inks. Next, printing with white ink (56) is performed on both the window opening portion (58) and the outer peripheral portion (57). As a result, a printed layer of white ink (56) is also formed in the window opening (58). In FIG. 3, each color ink is illustrated in layers, but in each layer, the ink exists in dots, and a specific character or picture is represented by a set of dots of each color.

  In the present invention, the white reflection density of the window opening (58) is 0.1 to 0.3, more preferably 0.15 to 0.25. If it is less than 0.1, in the seed bag manufactured using the seed wrapping material, it may be difficult to read the printed surface even if printing is performed on the upper surface of the window opening portion from the outside. On the other hand, if it exceeds 0.3, the contents stored in the seed bag may be difficult to observe. In addition, the said transmittance | permeability in this invention shall be measured by the method described in the Example mentioned later.

  In the present invention, in order to adjust the transmittance, the size of the concave portion by the white ink of the gravure printing machine is adjusted, the number of concave portions per unit area of the printing layer is adjusted, or the window opening portion ( 58) may be formed with a plurality of fine lines of white ink, and the pattern may be formed within a range not impairing the gist of the present invention.

  In the present invention, there is no limitation on the size of the window opening part, the size of the seed bag manufactured using the seed packaging material of the present invention, the type of seed to be stored, the internal capacity printed on the upper surface of the window opening part, etc. Can be appropriately selected.

  The printing layer is composed of one or more ordinary ink vehicles as the main component, and if necessary, a plasticizer, a stabilizer, an antioxidant, a light stabilizer, an ultraviolet absorber, a curing agent, and a crosslinking agent. Add one or more additives such as additives, lubricants, antistatic agents, fillers, etc., add colorants such as dyes and pigments, and use solvents, diluents, etc. An ink composition obtained by kneading to prepare an ink composition can be used. As such an ink vehicle, known ones such as sesame oil, drill oil, soybean oil, hydrocarbon oil, rosin, rosin ester, rosin modified resin, shellac, alkyd resin, phenolic resin, maleic resin, Natural resin, hydrocarbon resin, polyvinyl chloride resin, polyacetic acid resin, polystyrene resin, polyvinyl butyral resin, acrylic or methacrylic resin, polyamide resin, polyester resin, polyurethane resin, epoxy resin, urea resin , Melamine resin, amino alkyd resin, nitrocellulose, ethyl cellulose, chlorinated rubber, cyclized rubber, etc. can be used alone or in combination.

  Although the above was demonstrated by gravure printing, printing systems, such as letterpress printing, screen printing, transfer printing, flexographic printing, etc., may be sufficient.

(4) Resin barrier layer The resin barrier layer that can be suitably used in the present invention is a gas layer that is excellent in gas barrier properties and is a transparent or translucent resin layer that can form a printed layer after the surface treatment or surface treatment described later. It is.

  For example, polyethylene such as low density polyethylene resin (LDPE) and high density polyethylene resin (HDPE), polypropylene resin (PP), polyolefin resin such as polybutene, ethylene-α / β unsaturated carboxylic acid and its ester compound Polymer, ethylene-vinyl acetate copolymer (EVA), ethylene-vinyl alcohol (EVOH), nylon 6 film, nylon 66 film, nylon 12 film, nylon MXD6 film, polyamide resin such as nylon C, polyethylene terephthalate ( There are modified resins (such as PET), polybutylene terephthalate (modified) resins (such as PBT), vinylidene chloride-methyl acrylate copolymer (PVDC), and polyacrylonitrile (PAN). In particular, MXD6 nylon (NY), which is a crystalline polyamide having an oxygen barrier property, is suitable. Here, the nylon MXD6 film as a crystalline polyamide having an oxygen barrier property is a crystalline polyamide obtained from a polycondensation reaction of metaxylenediamine (MXDA) and adipic acid. In contrast, since the main chain has an aromatic ring, the gas barrier property is good, the strength is high, and the secondary processing suitability is good. In the present invention, EVOH or MXD6 can be preferably used.

  In addition, the resin barrier layer that can be used in the present invention is not limited to a single layer made of one of the above resins, and may be a multilayer film obtained by co-extrusion of two or more resins. Examples of such a multilayer film include a biaxially stretched nylon film coextruded with barrier ONY (MXD6) and a 15 μm biaxially stretched nylon film coextruded with EVOH. A commercial item can also be used for these.

  One or more of the above resins are used, and the resin is formed into a single layer using a film forming method such as an extrusion method, a cast molding method, a T-die method, a cutting method, an inflation method, or the like. Or two or more types of resin formed into a multilayer film by co-extrusion or the like, or a mixture of two or more types of resin to form a film, and a tenter method or a tubular method, etc. Various resin films formed by stretching in the axial direction can be used.

  It should be noted that one or more of the above resins are used, and in forming the film, for example, film processability, heat resistance, weather resistance, mechanical properties, dimensional stability, antioxidant properties, slipperiness, mold release, etc. Various plastic compounding agents and additives can be added for the purpose of improving and modifying properties, flame retardancy, anti-fungal properties, electrical properties, strength, etc. From a very small amount to several tens of percent, it can be arbitrarily added depending on the purpose.

  In the above, general additives include, for example, colorants such as lubricants, crosslinking agents, antioxidants, ultraviolet absorbers, light stabilizers, fillers, antistatic agents, lubricants, antiblocking agents, dyes, pigments and the like. Others can be arbitrarily used, and further, a modifying resin or the like can also be used.

  In the present invention, the thickness of the resin barrier layer is preferably 10 to 30 μm, more preferably about 12 to 25 μm.

  In the present invention, the resin barrier layer may be laminated as a film on a plastic substrate film or a heat seal layer via a laminating adhesive, and the resin constituting the resin barrier layer may be a plastic substrate film or heat seal. The layers may be laminated by melt extrusion or the like.

(5) Surface treatment In the present invention, it is preferable to form the printed layer after performing a surface treatment on the plastic substrate film or the resin barrier layer in advance when the printed layer is formed. Thereby, the adhesiveness of a printing layer and another layer can be improved. In addition, adhesion between the layers can be improved by performing a surface treatment in advance at the time of adhesion between the plastic base film and the resin barrier layer and between the resin barrier layer and the heat seal layer.

Such surface treatments include corona discharge treatment, ozone treatment, low temperature plasma treatment using oxygen gas or nitrogen gas, glow discharge treatment, oxidation treatment using chemicals, etc., and other pretreatments, etc. is there. Corona discharge treatment increases the strength of adhesion and thermal welding by causing corona discharge on the surface of the object to cause phenomena such as physical unevenness of the treated surface and oxidation of the chemical structure near the surface. It is done for the purpose. The processing conditions of the corona discharge treatment are a discharge gap of 1 to 15 mm, a substrate feed speed of 100 to 1000 cm / min, and a treatment strength of 300 to 1000 W / m ² / min.

  Further, a primer, an undercoat, an anchor coat or the like may be optionally applied in advance to the surface of various films used in the present invention for surface treatment.

  For example, plasma treatment is performed on the resin barrier film, then a printed layer is formed, and a heat seal layer is laminated on the printed layer via a laminating adhesive, or a primer and laminating adhesive are laminated on the resin barrier layer. The heat seal layer may be laminated by a dry laminate lamination method, or a molten resin that can constitute the heat seal layer may be laminated on the resin barrier layer via a primer and an anchor coat by melt extrusion.

(6) Primer layer In the present invention, by providing a primer layer, the adhesion between the resin barrier layer and the adhesive layer for laminating, the anchor coat layer, the heat seal layer, etc., which can be laminated thereon, is enhanced, and the lamination strength Can be improved.

As a primer constituting the primer layer, a polyurethane resin, a polyester resin or the like is a main component of the vehicle, and a silane coupling agent 0.05 to 10% with respect to 1 to 30% by mass of the polyurethane resin or polyester resin. A primer composition containing a mass and preferably 0.1 to 5 mass%, a filler of 0.1 to 20 mass%, preferably 1 to 10 mass%, and additionally containing a solvent and a diluent is used. be able to. If necessary, the primer composition may further contain a stabilizer, a curing agent, a crosslinking agent, a lubricant, an ultraviolet absorber, and other additives. In the present invention, the primer layer has a thickness of 0.1 to 10.0 g / m ² (dry state). The primer composition is coated by roll coating, gravure coating, knife coating, dip coating, spray coating, other coating methods, etc., the coating film is dried to remove the solvent and diluent, and if necessary An aging process etc. can be performed and it can be set as a primer layer.

  As the polyurethane resin, a polyurethane resin obtained by a reaction between a polyfunctional isocyanate and a hydroxyl group-containing compound can be used. For example, polyfunctional isocyanates such as aromatic polyisocyanates such as tolylene diisocyanate, diphenylmethane diisocyanate, polymethylene polyphenylene polyisocyanate, or aliphatic polyisocyanates such as hexamethylene diisocyanate, xylylene diisocyanate. And a one-component or two-component curable polyurethane resin obtained by a reaction between a polyether-based polyol, a polyester-based polyol, a polyacrylate polyol, and other hydroxyl group-containing compounds.

  On the other hand, as a polyester resin, thermoplasticity produced by polycondensation of one or more aromatic saturated dicarboxylic acids having a benzene nucleus as a basic skeleton such as terephthalic acid and one or more saturated dihydric alcohols. Can be exemplified. Examples of the aromatic saturated dicarboxylic acid having a benzene nucleus include terephthalic acid, isophthalic acid, phthalic acid, diphenyl ether, and 4,4-dicarboxylic acid. Moreover, as saturated dihydric alcohol, ethylene glycol, propylene glycol, trimethylene glycol, tetramethylene glycol, diethylene glycol, polyethylene glycol, polypropylene glycol, polytetramethylene glycol, hexamethylene glycol, dodecamethylene glycol, neopentyl glycol, etc. Examples thereof include alicyclic glycols such as fatty acid glycol and cyclohexasandimethanol, 2,2-bis (4′-β-hydroxyethoxyphenyl) propane, naphthalenediol and other aromatic diols.

  More specifically, as the polyester-based resin, a thermoplastic polyethylene terephthalate resin produced by polycondensation of terephthalic acid and ethylene glycol, and a thermoplastic polybutylene terephthalate resin produced by polycondensation of terephthalic acid and tetramethylene glycol. , Thermoplastic polycyclohexanedimethylene terephthalate resin produced by polycondensation of terephthalic acid and 1,4-cyclohexanedimethanol, thermoplastic polyethylene terephthalate resin produced by copolycondensation of terephthalic acid, isophthalic acid and ethylene glycol, terephthalate Thermoplastic polyethylene terephthalate resin produced by copolycondensation of acid, ethylene glycol and 1,4-cyclohexanedimethanol, terephthalic acid, isophthalic acid and ethylene glycol Thermoplastic polyethylene terephthalate resin produced by copolycondensation of propylene glycol, polyester polyol resins, and other like.

  One or more aliphatic saturated dicarboxylic acids such as malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, and dodecanoic acid, in addition to saturated aromatic dicarboxylic acid having a benzene nucleus And may be copolycondensed, and the amount used is preferably in the range of 1 to 10% by mass of the aromatic dicarboxylic acid.

  According to the polyurethane resin or polyester resin, the adhesion between the inorganic oxide, particularly the organic-containing silicon oxide layer, the printed layer, the heat seal layer, etc. can be improved, and the degree of elongation of the primer layer can be improved. Thus, suitability for post-processing such as laminating can be improved, and the occurrence of cracks in the organic-containing silicon oxide layer during post-processing can be prevented.

  As the silane coupling agent constituting the primer composition, organic functional group silane monomers having binary reactivity can be used. For example, γ-chloropropyltrimethoxysilane, vinyltrichlorosilane, vinyltriethoxysilane , Vinyl-tris (β-methoxyethoxy) silane, γ-methacryloxypropyltrimethoxysilane, β- (3,4-epoxycyclohexyl) ethylmethoxysilane, γ-glycidoxypropyltrimethoxysilane, vinyltriacetoxysilane , Γ-mercaptopropylmethoxysilane, N-β (aminoethyl) -γ-aminopropyltrimethoxysilane, N-β (aminoethyl) -γ-aminopropylmethyldimethoxysilane, γ-ureidopropyltriethoxysilane, bis ( β-hydroxye Le)-.gamma.-aminopropyltriethoxysilane, .gamma.-aminopropyl one such as an aqueous solution of silicones alone or may be used in combination of two or more.

  Examples of the filler constituting the primer composition include calcium carbonate, barium sulfate, alumina white, silica, talc, glass frit, and resin powder. When a filler is blended, the viscosity of the solution containing the polyurethane resin or polyester resin can be adjusted, the coating suitability can be improved, and a polyurethane resin or polyester resin and a silane coupling agent can be used as a binder resin. Thus, the cohesive strength of the coating film can be improved.

(7) Anchor coat In the present invention, for example, when a heat seal layer is formed by extrusion, a heat seal layer can be formed on the primer layer via an anchor coat. Examples of the anchor coat used include isocyanate (urethane), polyethyleneimine, polybutadiene, organic titanium, and other anchor coating agents. More preferably, for example, aromatic polyisocyanates such as tolylene diisocyanate, diphenylmethane diisocyanate, polymethylene polyphenylene polyisocyanate, or aliphatic polyisocyanates such as hexamethylene diisocyanate, xylylene diisocyanate, etc. Mainly used are polyether polyurethane resins, polyester polyurethane resins, and polyacrylate polyurethane resins obtained by reacting polyfunctional isocyanates with polyether polyols, polyester polyols, polyacrylate polyols, and other hydroxyl group-containing compounds. Ingredients. According to these, a thin film rich in flexibility and flexibility can be formed, its tensile elongation can be improved, processing suitability such as laminating and printing can be improved, and laminating strength can be improved. The anchor coat layer made of the anchor coat F preferably has a tensile elongation of 100 to 300% based on JIS standard K7113.

(8) Undercoat As the undercoat, for example, a polyester resin, a polyamide resin, a polyurethane resin, an epoxy resin, a phenol resin, a (meth) acrylic resin, a polyvinyl acetate resin, polyethylene or polypropylene A resin composition having a vehicle as a main component of a polyolefin resin such as the above or a copolymer or modified resin thereof, a cellulose resin, or the like can be used.

(9) Plasma treatment In the present invention, it is preferable to perform a plasma treatment in the surface treatment for the print layer and the resin barrier layer, whereby a clearer print layer can be formed.

  In the plasma treatment, an inorganic gas such as oxygen gas, nitrogen gas, argon gas, or helium gas can be used as the plasma gas. Particularly, oxygen gas or a mixed gas of oxygen gas and argon gas can be used. The plasma treatment is preferably performed using an inorganic gas containing oxygen gas as the plasma gas. Further, it is possible to perform plasma treatment at a lower voltage, and there is no particular discoloration of the surface of the resin barrier layer. Furthermore, the plasma treatment improves the gas barrier property against oxygen gas as well as the water vapor barrier property, and can relatively stably maintain a high gas barrier property against oxygen gas, water vapor, etc. In addition, a plasma treatment layer is formed on the surface of the resin barrier layer by performing a plasma treatment using a plasma gas composed of an inorganic gas containing an oxygen gas in a vacuum. When laminating a base material such as a layer, an adhesive layer, an anchor coat layer, a heat-sealable resin layer, etc., it is possible to improve the tight adhesion and the like and remarkably increase the lamination strength. .

Specifically, it is desirable to use a mixed gas of oxygen gas and argon gas, and the gas pressure of the mixed gas of oxygen gas and argon gas is about 1 × 10 ^{−1 to} 10 −10 Torr, More preferably, the 1 × 10 ⁻² to 1 × 10 ⁻⁸ Torr position is desirable, and the ratio of oxygen gas to argon gas is oxygen gas: argon gas = 100: 0 to 30:70 in terms of partial pressure ratio. More preferably, the 90:10 to 70:30 position is desirable, and the plasma output is preferably about 100 to 2500 W, more preferably about 500 to 1500 W, and the processing speed is 100 ˜600 m / min, more preferably 200 to 500 m / min. When the partial pressure ratio between the oxygen gas and the argon gas is increased, if the argon gas partial pressure is increased, oxygen molecules activated by the plasma are reduced, the argon gas acts as a reducing gas, and the introduction of hydroxyl groups is inhibited. Is not preferable. In addition, when the plasma output is less than 100 W, more preferably less than 500 W, the activation of oxygen gas is lowered, and it is difficult to produce highly active oxygen atoms. Furthermore, if it exceeds 2500 W, the plasma output is too high, which is not preferable because it causes the problem that the physical properties of the resin barrier layer deteriorate due to deterioration of the resin barrier layer and the like.

  Further, when the above processing speed is less than 100 m / min, further less than 250 m / min, the amount of oxygen plasma is small, and when it exceeds 600 m / min, and further exceeds 500 m / min, The oxidation of the barrier layer proceeds rapidly and the transparency becomes high, but the barrier property is lowered, which is not preferable.

  In the present invention, in plasma processing, plasma is generated by using three types of devices such as direct current glow discharge, radio frequency (AF) discharge, and microwave discharge. Can do. In the present invention, a high frequency (AF) discharge device of 3.56 MHz can be used.

(10) Heat-seal layer As the heat-seal layer, polyolefin resins having various heat-seal properties that can be melted by heat and fused to each other can be used. Specifically, low density polyethylene, medium density polyethylene, high density polyethylene, linear (linear) low density polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, ethylene -Ethyl acrylate copolymer, ethylene-methacrylic acid copolymer, ethylene-α / olefin copolymer polymerized using metallocene catalyst, polypropylene, ethylene-methyl methacrylate copolymer, ethylene-propylene copolymer Polyolefin resins such as methylpentene polymer, polybutene polymer, polyethylene or polypropylene modified with an unsaturated carboxylic acid such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid, Vinyl acetate Resins, poly (meth) acrylic resin, one or more films made of a resin such as polyvinyl chloride resin or sheet or coated film and the like can be used.

  The heat seal layer may be previously laminated with another layer using a film, or the resin constituting the heat seal layer may be melt extruded and laminated with the other layer.

  The heat seal layer may be a single layer or a multilayer composed of one of the above resins, and the thickness of the heat seal layer is 15 to 130 μm.

(11) Laminating adhesive In the present invention, a laminating adhesive can be used for laminating a plastic base film and a resin barrier layer, laminating a plastic base film and a heat seal layer, and the like. In this case, a primer layer is formed by applying a primer to the resin barrier layer, and then a base material such as a heat seal layer is laminated on the surface of the primer layer using a laminating adhesive using a dry laminating lamination method. May be. In addition, when any two layers are laminated, they can be adhered by a dry laminate lamination method via a laminating adhesive.

  The adhesive for laminating comprises a polyvinyl acetate adhesive, a homopolymer such as ethyl acrylate, butyl, 2-ethylhexyl ester or a copolymer of these with methyl methacrylate, acrylonitrile, styrene, etc. Polyacrylate adhesives, cyanoacrylate adhesives, ethylene copolymer adhesives made of copolymers of ethylene and monomers such as vinyl acetate, ethyl acrylate, acrylic acid, methacrylic acid, etc., cellulose adhesives Polyester adhesive, polyamide adhesive, polyimide adhesive, amino resin adhesive made of urea resin or melamine resin, phenol resin adhesive, epoxy adhesive, polyurethane adhesive, reactive type (meta ) Acrylic acid adhesive, chloroprene rubber, nitrile Beam, styrene - inorganic adhesive made of butadiene rubber, a silicone-based adhesive, an alkali metal silicate, inorganic adhesive made of low-melting glass, it is possible to use other adhesives.

  More preferably, for example, aromatic polyisocyanates such as tolylene diisocyanate, diphenylmethane diisocyanate, polymethylene polyphenylene polyisocyanate, or aliphatic polyisocyanates such as hexamethylene diisocyanate, xylylene diisocyanate, etc. Mainly used are polyether polyurethane resins, polyester polyurethane resins, and polyacrylate polyurethane resins obtained by reacting polyfunctional isocyanates with polyether polyols, polyester polyols, polyacrylate polyols, and other hydroxyl group-containing compounds. Ingredients. According to these, it is possible to form a thin film rich in flexibility and flexibility, improve its tensile elongation, and as a film having flexibility, flexibility, etc. against a barrier thin film layer made of an inorganic oxide It can act and improve processing aptitude, such as lamination processing and printing processing, and can avoid generation of a crack etc. to a barrier thin film layer which consists of inorganic oxides. The laminate adhesive layer made of the above-mentioned laminate adhesive preferably has a tensile elongation of 100 to 300% based on JIS standard K7113.

  The composition system of these adhesives may be any composition form such as an aqueous type, a solution type, an emulsion type, and a dispersion type, and the property may be any of a film, a sheet, a powder, a solid, and the like. Furthermore, the reaction mechanism may be any of a chemical reaction type, a solvent volatilization type, a heat welding type, a hot pressure type, and the like.

Although there is no limitation in the usage-amount of the adhesive agent for lamination, Generally, it is 0.1-10 g / m < ² > (dry state). The laminating adhesive can be applied by roll coating, gravure coating, kiss coating or other coating methods or printing methods.

(12) Method for producing seed packaging material The seed packaging material of the present invention is obtained by previously forming the printed layer on at least one of a plastic substrate film and a resin barrier layer, and a heat seal layer as an innermost layer. Thus, it can be manufactured by bonding through an adhesive layer for laminating as appropriate. The film may be any film such as extrusion film formation, inflation film formation, and coating film. Moreover, when the said resin barrier layer is marketed, a commercial item can also be used.

  The printed layer may be printed directly on one or more of the plastic substrate film and the resin barrier layer in order from dark to light, but preferably the corona treatment or plasma treatment is applied to the plastic substrate film or the resin barrier layer. It is preferable to carry out the surface treatment or after applying a primer to form a primer layer. As a result, a clear printed layer can be formed. In the present invention, the uppermost layer of the printing layer is light color, particularly preferably white, and this white printing layer is laminated with either the heat seal layer or the base film layer of the resin barrier layer via the laminating adhesive. .

  Further, in the present invention, when any film or layer is laminated, if necessary, pretreatment such as corona treatment or ozone treatment can be applied to the film as described above. (Urethane-based), polyethyleneimine-based, polybutadiene-based, organic titanium-based anchor coating agents, or polyurethane-based, polyacrylic-based, polyester-based, epoxy-based, polyvinyl acetate-based, cellulose-based and other adhesives for laminates In addition to a known pretreatment such as, an anchor coat can be used.

(13) Seed Bag The seed bag of the present invention can be produced by stacking the heat-sealing layers of the seed wrapping material so as to face each other and heat-sealing the ends in a bag shape. In the present invention, when the uppermost layer of the print layer is printed with a light color ink such as a white ink, the light color ink layer such as the uppermost white ink can be visually observed from the heat seal layer.

  Since the seed wrapping material has a window opening in the printed layer, a window opening having a white reflection density of 0.1 to 0.3 is formed in any of the seed bags. In the present invention, there is no limitation on the location where the window opening portion is formed. For example, as shown in FIG. 2, the window opening portion (120) is formed at the lower part of either the front surface or the back surface of the seed bag (100). Is preferred. The stored contents can be easily confirmed through the window opening (120). In addition, when the transparency of the window opening (120) is adjusted to a specific range with a light color ink such as white ink, printing is performed with dark ink from the outside of the seed bag from above the window opening. This can be done and the printed content can be easily read. As described above, when the uppermost layer of the print layer is printed with light color ink such as white ink, the heat seal layer side is light color such as white, and the background of the window opening portion (120) is It becomes white or light color. For this reason, it is possible to facilitate reading of the printing on the upper surface of the window opening portion (120).

  In general, information common to seeds such as a trade name, information about stored seeds and a cultivation method is often printed on the seed bag. Such printing can be performed conventionally on the outer periphery (125) of FIG. On the other hand, in the seed bag of the present invention, the contents can be confirmed with the naked eye by providing the window opening portion (120), and the upper surface of the window opening portion (120) is different from the seed bag body. Printing can be performed. Examples of the contents printed on the window opening part (120) include individual information such as a lot number, a manufacturing date, a quality retention period, a production place, and a germination rate.

  In the present invention, the seed bag of the present invention can be produced by various methods depending on the position of the window opening portion of the seed packaging material. For example, when using a seed wrapping material having the plastic base film (10) of the present invention in the outermost layer and having the heat seal layer (30) in the innermost layer, for example, as shown in FIG. 120) is positioned at the lower part of either the front or back surface of the seed bag, folded back into a bag shape so that the heat seal layer (30) of the seed wrapping material faces, and the two separated sides are overlapped There is a method of heat-sealing the side and the bottom.

  Moreover, in this invention, the window opening part (120) should just be provided in the seed bag (100) at least one place. Therefore, for example, the seed wrapping material of the present invention is used so that the window opening portion is formed on either the front surface or the back surface of the seed bag, and the seed wrapping material window of the present invention is formed on the other surface. It is preferable to use a portion having no perforated portion. Moreover, when forming a several window opening part (120), what is necessary is just to make it a window opening part not overlap when manufacturing the bag for seeds.

  In addition, the heat seal layer located in the innermost layer of the seed wrapping material is faced and overlapped, and thereafter, the heat seal part is formed by heat-sealing the three sides of the outer periphery and the upper part thereof. By forming the opening, a three-side sealed type seed bag can be manufactured. If these seed bags are used, various seeds are filled from the upper opening, and then the opening is heat-sealed, a packaged product using the seed bag of the present invention can be manufactured. it can. In addition, as the shape of the seed bag of the present invention, a packaging bag having various forms suitable for the contents such as a pillow packaging form, a gusset packaging form, a standing (self-supporting) pouch packaging form, and the like can be manufactured. . In addition, as a method of heat sealing, it can carry out by well-known methods, such as a bar seal, a rotary roll seal, a belt seal, an impulse seal, a high frequency seal, an ultrasonic seal, for example.

  In addition, the seed bag of the present invention may be provided with cuts (115) so that the corners (113) of the four corners are cut into round shapes and can be easily opened as shown in FIG. Such incision can be appropriately selected in consideration of the stretching direction of the plastic substrate film to be used.

  Examples of seeds that can be stored in the seed bag of the present invention include vegetables, flower seeds, and other fruits.

  EXAMPLES Next, although an Example is given and this invention is demonstrated concretely, these Examples do not restrict | limit this invention at all.

Example 1
Printing is carried out by a gravure printing method using a normal gravure ink composition on a corona-treated layer of a biaxially stretched polypropylene film (OPP film: Toyobo Co., Ltd., trade name “P2161”) having a thickness of 40 μm. It was. Printing starts on the corona-treated layer from dark to light, in black, indigo, red, yellow, and white. Except for white, a rectangular window with a length of 27 mm and a width of 63 mm can be formed. A thin white translucent printing layer was formed on the window opening portion by setting the number of lines, the plate depth, and the knitting of the gravure direct plate.

  On the printed layer, a two-component curable adhesive for lamination (manufactured by Mitsui Takeda Chemical Co., Ltd., trade name “main agent A969 / hardener A5”) is coated by a gravure roll coating method, and this adhesive layer for lamination A 12 μm thick EVOH (ethylene-vinyl alcohol copolymer resin) film (manufactured by Kuraray Co., Ltd., trade name “EVAL”) is laminated on the surface of the film, and the two are laminated by lamination, and the above laminated laminated film is further laminated. The surface of the adhesive layer for laminating is coated with a two-component curing adhesive for laminate (made by Mitsui Takeda Chemical Co., Ltd., trade name “main agent A969 / curing agent A5”) by the gravure coat roll method. A polyethylene film with a thickness of 60 μm (trade name “LC-21”, manufactured by Tamapoly Co., Ltd.) Lay lamination was carried out to produce a seed packaging material of the present invention.

  The layer structure of the obtained seed packaging material is OPP film 40 μm / pattern printing layer + translucent window printing layer 1 μm / dry laminating adhesive layer 3 μm / EVOH 12 μm / dry laminating adhesive layer 3 μm / polyethylene film 60 μm. .

  The reflection density, haze, total light transmittance, oxygen permeability, and water vapor permeability of the seed packaging material were measured. The results are shown in Tables 1-4.

Example 2
Instead of a 12 μm thick EVOH (ethylene-vinyl alcohol copolymer resin) film (manufactured by Kuraray Co., Ltd., trade name “EVAL”), a 15 μm biaxial barrier nylon film (Mitsubishi resin) co-extruded with barrier ONY (MDX6) A seed packaging material was produced in the same manner as in Example 1 except that the product name “Super Neil” was used.

  The layer composition of the obtained seed packaging material was: OPP film 40 μm / pattern printing layer + translucent window printing layer 1 μm / dry laminating adhesive layer 3 μm / MXD co-extruded ONY film 15 μm / dry laminating adhesive layer 3 μm / The polyethylene film is 60 μm.

  The reflection density, haze, total light transmittance, oxygen permeability, and water vapor permeability of the seed packaging material were measured. The results are shown in Tables 1-4.

Example 3
Instead of a 12 μm thick EVOH (ethylene-vinyl alcohol copolymer resin) film (Kuraray Co., Ltd., trade name “EVAL”), a 15 μm biaxial barrier nylon film co-extruded with EVOH (manufactured by Gunze Co., Ltd., product) A seed packaging material was produced in the same manner as in Example 1 except that the name “Heptax” was used.

  The layer structure of the obtained seed packaging material was: OPP film 40 μm / pattern printing layer + translucent window printing layer 1 μm / dry laminating adhesive layer 3 μm / EVOH co-extruded ONY film 15 μm / dry laminating adhesive layer 3 μm / The polyethylene film is 60 μm.

  The reflection density, haze, total light transmittance, oxygen permeability, and water vapor permeability of the seed packaging material were measured. The results are shown in Tables 1-4.

なお、反射濃度、ヘーズ、全光線透過率、酸素透過度、水蒸気透過度は、以下の方法で測定した。

The reflection density, haze, total light transmittance, oxygen permeability, and water vapor permeability were measured by the following methods.

(I) Reflection density About the outer peripheral part and window opening part of the printing layer of the seed packaging material, it measured using the reflection densitometer (ATECH LTD company make, X-RITE model 810).

(Ii) Haze The haze meter (110M-2K manufactured by Suga Test Instruments Co., Ltd.) was used to measure the outer periphery and window opening of the printed layer of the seed packaging material.

(Iii) Total light transmittance About the outer peripheral part and window opening part of the printing layer of the seed packaging material, it measured using the total light transmittance measuring machine (110M-2K by Suga Test Instruments).

(Iv) Oxygen permeability With respect to the seed wrapping material, using a measuring instrument manufactured by MOCON, USA (model name: OX-TRAN 2/20) under the conditions of a temperature of 23 ° C. and a humidity of 90% RH It was measured.

(V) Water vapor transmission rate For seed packaging material, using a measuring instrument manufactured by MOCON, USA (model name: Permatran 3/31) under conditions of a temperature of 40 ° C. and a humidity of 90% RH It was measured.

  Since the seed packaging according to the present invention is provided with a window opening in the printed layer, the contents can be observed from the outside, and the window opening can be printed from outside, Individual information such as lots can be printed, which is excellent in aesthetics, functional and useful.

FIG. 1 is a cross-sectional view illustrating a seed wrapping material used in the present invention. It is a figure which shows the external appearance of the bag for seeds used by this invention. It is a cross-sectional view of a plastic substrate film having a printed layer in the seed packaging material of the present invention, and is a diagram for explaining a method of forming a printed layer having a window opening on the plastic substrate film. It is explanatory drawing at the time of manufacturing a seed bag using the packaging material for seeds of this invention.

Explanation of symbols

10 ... plastic base film,
20 ... resin barrier layer,
30 ... heat seal layer,
50 ... printing layer,
57 ... outer periphery,
58 ... Window opening,
60 ... Primer layer,
70 ... Laminate adhesive layer,
80 ... corona treatment layer,
100 ... Seed wrapping material,
110 ... heat seal part,
113 ... corner,
115 ... notches,
120 ... Window opening,
125 ... outer peripheral part.

Claims (7)

A seed packaging material in which a plastic base film, a resin barrier layer, and a heat seal layer are laminated,
The seed wrapping material has a printing layer between the plastic base film and the resin barrier layer and / or between the resin barrier layer and the heat seal layer, and the printing layer is more than the outer periphery. A seed packaging material having a window opening portion printed in a light color and having a white reflection density of 0.1 to 0.3.   The seed printing material according to claim 1, wherein the printed layer is formed on the plastic substrate film and / or the resin barrier layer, or a surface treatment layer thereof.   The seed packaging material according to claim 2, wherein the surface treatment is any one of plasma treatment, corona discharge treatment, ozone treatment, low temperature plasma treatment, and glow discharge treatment.   The seed packaging material according to claim 2, wherein the surface treatment is performed by applying a primer, an anchor coat and / or an undercoat.   The seed packaging material according to any one of claims 1 to 4, wherein the printing layer is formed by gravure printing, and the ink constituting the uppermost layer of the printing layer is a white ink.   The seed packaging material according to any one of claims 1 to 5, wherein the plastic substrate film is a stretched nylon film, a biaxially stretched polyethylene terephthalate film, or a biaxially stretched polypropylene film, and has a thickness of 6 to 100 µm. .   A seed bag formed by molding the seed packaging material according to claim 1 into a bag shape.

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