WO2014046070A1 - 農業用被覆材及びその製造方法 - Google Patents
農業用被覆材及びその製造方法 Download PDFInfo
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- WO2014046070A1 WO2014046070A1 PCT/JP2013/074978 JP2013074978W WO2014046070A1 WO 2014046070 A1 WO2014046070 A1 WO 2014046070A1 JP 2013074978 W JP2013074978 W JP 2013074978W WO 2014046070 A1 WO2014046070 A1 WO 2014046070A1
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- WIPO (PCT)
- Prior art keywords
- nonwoven fabric
- covering material
- agricultural
- mass
- agricultural covering
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Classifications
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G13/00—Protecting plants
- A01G13/02—Protective coverings for plants; Coverings for the ground; Devices for laying-out or removing coverings
- A01G13/0256—Ground coverings
- A01G13/0262—Mulches, i.e. covering material not-pre-formed in mats or sheets
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G9/00—Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
- A01G9/14—Greenhouses
- A01G9/1438—Covering materials therefor; Materials for protective coverings used for soil and plants, e.g. films, canopies, tunnels or cloches
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G13/00—Protecting plants
- A01G13/02—Protective coverings for plants; Coverings for the ground; Devices for laying-out or removing coverings
- A01G13/0256—Ground coverings
- A01G13/0268—Mats or sheets, e.g. nets or fabrics
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G22/00—Cultivation of specific crops or plants not otherwise provided for
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G9/00—Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
- A01G9/22—Shades or blinds for greenhouses, or the like
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
- D04H1/541—Composite fibres, e.g. sheath-core, sea-island or side-by-side; Mixed fibres
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/005—Synthetic yarns or filaments
- D04H3/007—Addition polymers
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/02—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
- D04H3/14—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic yarns or filaments produced by welding
- D04H3/147—Composite yarns or filaments
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G13/00—Protecting plants
- A01G13/02—Protective coverings for plants; Coverings for the ground; Devices for laying-out or removing coverings
- A01G13/0231—Tunnels, i.e. protective full coverings for rows of plants
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/25—Greenhouse technology, e.g. cooling systems therefor
Definitions
- the present invention relates to an agricultural coating material comprising a nonwoven fabric of a propylene-based polymer composition, and in particular, agriculture suitable for outdoor cultivation, tunnel cultivation, house cultivation use, and direct application (solid application) excellent in durability and crop growth.
- the present invention relates to a coating material and a manufacturing method thereof.
- Agricultural coatings are widely used to protect crops from changes in the external environment and help them grow. Broadly divided into agricultural coverings, there are films and non-woven fabrics, which are used according to their characteristics.
- Agricultural coverings made of film have high barrier properties and high transparency (or high light-blocking properties) instead of low or low breathability.
- warm insulation greenhouse cultivation
- fruit It is used for applications such as rainwater infiltration suppression, weed overgrowth suppression, and prevention of insect pests.
- Patent Document 1 Japanese Utility Model Publication No. 4-8769 discloses a non-woven fabric made of hydrophobic fibers such as polypropylene fibers of 6 denier or more and having a basis weight of 10 to 30 g / m 2 and a light transmittance of 85% or more.
- An agricultural covering material for solid hanging has been proposed.
- Agricultural coating materials made of polypropylene fiber nonwoven fabric are excellent in productivity, strength, etc., but depending on the usage situation, durability may be insufficient, and agricultural coating materials with higher durability are required. .
- the nonwoven fabric itself may be destroyed due to natural deterioration due to long-term use of agricultural coverings made of nonwoven fabric, external loads from wind and rain during use, and rubbing with leaves of vegetables in use. It has become an issue.
- a phenomenon is observed in which the hot embossed portion (thermocompression bonding portion) of the nonwoven fabric is unwound and the filaments of the long fibers constituting the nonwoven fabric are loosened.
- the strength of the nonwoven fabric itself decrease, but it also causes a big problem that the unwound yarn is caught inside vegetables, especially lettuce that forms a head, and is found as a foreign object at the final consumption. .
- the object of the present invention is to develop an agricultural covering material that is superior in durability, such as yarn-scratching resistance, and is excellent in the growth of agricultural products such as vegetables.
- Agricultural coating material comprising a nonwoven fabric obtained from the propylene-based polymer composition and a method for producing the same.
- the agricultural covering material of the present invention is excellent in durability such as yarn resistance and waterproofness, has breathability and heat retention, and is waterproof while maintaining sufficient light transmittance to maintain the growth and visibility of crops.
- the harvest time of crops is increased, the yield is increased, the crops are protected from cold damage, the poor growth of the chiefs is eliminated, the crops are protected from floods such as rainwater, and the arrival of pests. be able to.
- the propylene polymer (A) which is the main component of the propylene polymer composition that is the raw material of the nonwoven fabric constituting the agricultural coating material of the present invention, usually has a melting point (Tm) of 155 ° C. or higher, preferably 157 to A propylene homopolymer in the range of 165 ° C. or a propylene and a small amount of ethylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 4-methyl-1-pentene, etc.
- Tm melting point
- Polymers mainly composed of propylene such as a copolymer with one or two or more ⁇ -olefins of 2 to 8 (excluding carbon number 3), preferably 2 to 8 (excluding carbon number 3).
- a homopolymer of propylene is preferable.
- the melt flow rate (MFR 230 : ASTM D-1238, 230 ° C., load 2160 g) is not particularly limited. Is usually in the range of 1 to 500 g / 10 minutes, preferably 5 to 200 g / 10 minutes, more preferably 10 to 100 g / 10 minutes. When a melt-blown nonwoven fabric is used, usually 10 to 3000 g / 10 minutes, Preferably, it is in the range of 50 to 2000 g / 10 min, more preferably 100 to 1000 g / 10 min.
- the ratio Mw / Mn of the weight average molecular weight (Mw) and the number average molecular weight (Mn) of the propylene polymer according to the present invention is usually 1.5 to 5.0.
- the range of 1.5 to 4.5 is more preferable in that a fiber having good spinnability and particularly excellent fiber strength can be obtained.
- Mw and Mn can be measured by a known method by GPC (gel permeation chromatography).
- the ethylene-based polymer (B) which is another component of the propylene-based polymer composition that is the raw material of the nonwoven fabric constituting the agricultural coating material of the present invention, is an ethylene homopolymer or ethylene and a small amount of propylene, 1 High pressure low density polyethylene, linear low density polyethylene (so-called LLDPE), medium density polyethylene (copolymers with ⁇ -olefins such as butene, 1-hexene, 4-methyl-1-pentene and 1-octene) Polymers mainly composed of ethylene such as so-called MDPE and high-density polyethylene (so-called HDPE).
- LLDPE linear low density polyethylene
- HDPE high-density polyethylene
- the ethylene polymer (B) according to the present invention has a density of 0.94 to 0.97 g / cm 3 , more preferably 0.95 to 0.97 g / cm 3 from the viewpoint of fiber spinnability and strength.
- High density polyethylene (HDPE) in the range is preferred.
- the melt flow rate (MFR 190 : ASTM D 1238, 190 ° C., load 2160 g) is particularly limited. Usually, it is in the range of 0.1 to 100 g / 10 min, more preferably 0.5 to 50 g / 10 min, still more preferably 1 to 30 g / 10 min, most preferably 2 to 10 g / 10 min. .
- the propylene polymer composition used as the raw material for the nonwoven fabric constituting the agricultural coating material of the present invention comprises 90 to 98% by mass of the propylene polymer (A), preferably 92 to 97% by mass, and the ethylene polymer weight.
- (B) 10-2% by mass, preferably 8-3% by mass [provided that (A) + (B) 100% by mass.
- the composition is 90 to 98% by mass of the propylene polymer (A), preferably 92 to 97% by mass, and the ethylene polymer weight.
- the composition is 90 to 98% by mass of the propylene polymer (A), preferably 92 to 97% by mass, and the ethylene polymer weight.
- the resulting nonwoven fabric has insufficient durability (such as bonding strength of a heat embossed portion (also referred to as a thermocompression bonding portion)).
- the nonwoven fabric is used as an agricultural covering material, the improvement of crop growth is not sufficient.
- the propylene-based polymer composition according to the present invention includes a colorant, an antioxidant, a weathering stabilizer, a light-resistant stabilizer, an anti-blocking agent, a lubricant, a nucleating agent, a pigment, and a softening agent as long as the object of the present invention is not impaired.
- Various known additives such as agents, hydrophilic agents, water repellents, auxiliaries, water repellents, fillers, antibacterial agents, agricultural chemicals, insect repellents, and drugs may be added.
- it is effective to add an antioxidant, a weather stabilizer, a light stabilizer, and a pigment that affects the growth activity of plants when used outdoors.
- the agricultural covering material of this invention consists of a nonwoven fabric obtained from the said propylene-type polymer composition.
- nonwoven fabric used for the agricultural covering material of the present invention various known nonwoven fabrics such as a short fiber nonwoven fabric and a long fiber nonwoven fabric can be used.
- a nonwoven fabric composed of long fibers and a spunbond nonwoven fabric are transparent and heat retaining properties of the nonwoven fabric. In terms of balance, flexibility, light weight, and low damage to vegetables.
- covering material of this invention consists of the nonwoven fabric obtained from the said propylene-type polymer composition
- covering material of this invention is the said propylene in the range which does not impair the objective of this invention.
- other fibers such as fibers obtained from the propylene polymer (A) alone, or fibers obtained from other olefin polymers, polyesters, thermoplastic elastomers, etc. May be a non-woven fabric made of mixed fibers.
- the fiber constituting the nonwoven fabric which is the agricultural coating material of the present invention is a single fiber made of the propylene polymer composition
- the propylene heavy polymer is used within the range not impairing the object of the present invention.
- the composite fiber which has a side-by-side and core-sheath structure containing a union composition may be sufficient.
- the cross-sectional shape of the fibers forming the nonwoven fabric may be a round shape, a star shape, a polygonal shape such as a triangular shape, a square shape, or a pentagonal shape, an elliptical shape, or a hollow shape.
- the agricultural coating material of the present invention usually has a basis weight of 10 to 50 g / m 2 , preferably 10 to 30 g / m 2 , more preferably 13 to 30 g / m 2 , and usually has a light transmittance of 70% or more. Preferably, it is 75% or more, more preferably 80% or more, the fiber diameter is usually in the range of 10 to 50 ⁇ m, preferably 13 to 40 ⁇ m, and the yarn fray durability is usually 12 times or more, preferably 14 times or more. is there.
- the agricultural covering material of the present invention preferably has a thermocompression bonding part.
- the thermocompression bonding part is preferably partially thermocompression bonded in an area ratio of 5 to 30%, preferably 5 to 20%.
- the strength and elongation of the non-woven fabric constituting the agricultural covering material of the present invention is such that the MD (machine direction) strength is sufficient to withstand the workability at the time of laying and detaching and various external and internal environments during use. It is preferable that 20N or more, CD (lateral direction) strength is 10N or more, MD elongation is 50% or more, and CD elongation is 50% or more. More preferably, the MD strength is 25N or more, the CD strength is 10N or more, the MD elongation is 70% or more, and the CD elongation is 70% or more. If the strength and elongation are less than the above, it is not preferable because holes are easily formed or broken in the nonwoven fabric laminate.
- melt blown nonwoven fabric wet nonwoven fabric, dry nonwoven fabric, dry pulp nonwoven fabric, flash spinning nonwoven fabric, spread nonwoven fabric, It may be combined with a film or the like.
- a laminate of a meltblown nonwoven fabric layer and a spunbond nonwoven fabric is preferable, and a nonwoven fabric laminate in which the meltblown nonwoven fabric layer and the spunbond nonwoven fabric layer are partially laminated by thermal fusion (thermocompression bonding) is more preferable.
- meltblown nonwoven fabric layer / spunbond nonwoven fabric examples include a meltblown nonwoven fabric layer / spunbond nonwoven fabric and a spunbond nonwoven fabric / meltblown nonwoven fabric layer / spunbond nonwoven fabric.
- nonwoven fabric laminates the configuration of spunbond nonwoven fabric / meltblown nonwoven fabric layer / spunbond nonwoven fabric is preferable from the viewpoint of durability of the agricultural coating material.
- meltblown nonwoven fabric layer and the spunbond nonwoven fabric layer various methods can be used as described later, but embossing can be preferably used.
- embossing can be preferably used.
- “partially” means a range of 5 to 30%, preferably 5 to 20% in terms of area ratio.
- the fiber diameter is 0.1 to 10 ⁇ m, preferably 1 to 10 ⁇ m, more preferably 3 to 10 ⁇ m, and the basis weight is 0.1 to 3 g / m 2 , preferably 0.3 to 3 g / m 2. More preferably, it is in the range of 0.5 to 3 g / m 2 , further preferably 0.5 to 2.5 g / m 2 , and most preferably 0.5 to 1.5 g / m 2 .
- the fiber diameter and basis weight of the melt blown nonwoven fabric layer are within the above ranges, the strength / elongation is maintained and the balance of heat retention / barrier properties and breathability is excellent, and the transmittance decreases due to diffused reflection of light caused by fine fibers. Is also preferable because it can be minimized. Moreover, it is excellent in the uniformity of the said physical property.
- the agricultural covering material of the present invention is used to promote the growth of crops by keeping warm and moisturized, to protect crops from weather such as wind and rain, and to prevent external damage from insects and birds, etc. It can be widely used for cultivation.
- the agricultural covering material of the present invention as a so-called solid cover material for outdoor cultivation, it is only necessary to directly hook the entire ridge including agricultural products and fix the end portion, so it is very simple. This is preferable because it can be stretched.
- the agricultural covering material of the present invention is not limited to a mode in which it is directly applied to a crop (solid), but also when it is desired to secure a sufficient internal space in consideration of the plant height after the growth of the crop, etc. It can also be used as a covering material for floating or house cultivation.
- the agricultural covering material of the present invention may be used in combination with other agricultural covering materials such as other non-woven fabrics and films, for example, in order to adjust the balance of heat retention, moisture retention and air permeability. Is possible.
- covering material can be manufactured with the manufacturing method of various well-known nonwoven fabrics.
- the spunbond nonwoven fabric is produced by the method for producing a spunbond nonwoven fabric.
- the propylene polymer composition is spun from a spinning nozzle in advance, and the spun long fiber filament is cooled with a cooling fluid or the like, and tension is applied to the filament with drawn air to obtain a predetermined fineness. Then, the obtained filaments can be collected on a moving collection belt to produce a spunbonded nonwoven fabric.
- the spunbonded nonwoven fabric used as the agricultural coating material of the present invention can maintain the strength and heat retention of the agricultural coating material obtained by partial thermocompression bonding by embossing or the like. This is preferable in terms of improving transparency and maintaining a balance between flexibility and air permeability.
- the embossed area ratio (thermocompression bonding portion) is usually in the range of 5 to 30%, preferably 5 to 20%.
- the stamped shape include a circle, an ellipse, an ellipse, a square, a rhombus, a rectangle, a square, a quilt, a lattice, a turtle shell, and a continuous shape based on these shapes.
- the agricultural covering material of the present invention is used after being subjected to secondary processing such as gear processing, printing, coating, laminating, heat treatment, shaping processing, hydrophilic processing, water-repellent processing, etc., as long as the object of the present invention is not impaired. Also good.
- a non-woven fabric to be measured is attached to the ceiling of the box, the distance from the light source is kept at 25 cm, and an illuminometer is installed 30 cm below the non-woven surface of the ceiling inside the box.
- the illuminance L1 is measured without attaching the nonwoven fabric of the sample, and then the nonwoven fabric is attached and the illuminance L2 is measured.
- the light transmittance is determined by the following equation.
- Lettuce germination rate Using an agricultural covering material, solid cultivation of lettuce was carried out in December, seeding in December and harvesting in March of the following year at 3 rows x 5 m x cocoon width 90 cm. When the germination after sowing was 50% or more, the solid covering material was removed all at once, and the germination number / sowing number was counted and calculated as the germination rate.
- the span of the fiber diameter is 40 ⁇ m and the basis weight is 20 g / m 2 .
- a bond nonwoven agricultural covering material was obtained.
- the obtained agricultural coating material was evaluated by the method described above. The results are shown in Table 1.
- Examples 2 and 3 Except having set it as the spun bond nonwoven fabric which has a composition ratio, fiber diameter, and fabric weight of Table 1, it carried out similarly to Example 1 and obtained the agricultural coating
- the obtained agricultural covering material was evaluated by the method described above. The results are shown in Table 1.
- the obtained agricultural dressing material was not excellent in the durability of yarn fraying, and the yarn fraying after promotion and after use was particularly remarkable.
- the results are shown in Table 1.
- Polyethylene terephthalate [PET1, product name J125 manufactured by Mitsui Chemicals, Inc.] is used as the polyester polymer for the core, high-density polyethylene (PE2) is used for the sheath, and composite melt spinning is performed, and the core ratio is 50 weight. % (Core: sheath weight ratio: 50:50) was deposited on the collecting surface to obtain a spunbond nonwoven agricultural covering material. The strength of the nonwoven fabric was good, but the elongation was insufficient. Further, after the promotion and after use, the heat embossed portion was broken in such a manner that the sheath portion was separated from the core portion, resulting in poor durability.
- PET1 product name J125 manufactured by Mitsui Chemicals, Inc.
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- Engineering & Computer Science (AREA)
- Environmental Sciences (AREA)
- Textile Engineering (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Soil Sciences (AREA)
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- Protection Of Plants (AREA)
- Nonwoven Fabrics (AREA)
- Greenhouses (AREA)
Abstract
Description
本発明の農業用被覆材を構成する不織布の原料となるプロピレン系重合体組成物の主成分であるプロピレン系重合体(A)は、通常、融点(Tm)が155℃以上、好ましくは157~165℃の範囲にあるプロピレンの単独重合体若しくはプロピレンと少量のエチレン、1-ブテン、1-ペンテン、1-ヘキセン、1-オクテン、4-メチル-1-ペンテン等の炭素数2以上(但し炭素数3を除く)、好ましくは2~8(但し炭素数3を除く)の1種または2種以上のα-オレフィンとの共重合体などのプロピレンを主体とする重合体である。なお、不織布の強度や紡糸安定性を維持するためには、プロピレンの単独重合体が好ましい。
本発明の農業用被覆材を構成する不織布の原料となるプロピレン系重合体組成物の他の成分であるエチレン系重合体(B)は、エチレンの単独重合体、あるいはエチレンと少量のプロピレン、1-ブテン、1-ヘキセン、4-メチル-1-ペンテンおよび1-オクテン等のα-オレフィンとの共重合体である高圧法低密度ポリエチレン、線状低密度ポリエチレン(所謂LLDPE)、中密度ポリエチレン(所謂MDPE)、高密度ポリエチレン(所謂HDPE)などのエチレンを主体とする重合体である。
本発明の農業用被覆材を構成する不織布の原料となるプロピレン系重合体組成物は、前記プロピレン系重合体(A)90~98質量%、好ましくは92~97質量%、及び前記エチレン系重合体(B)10~2質量%、好ましくは8~3質量%〔但し、(A)+(B)=100質量%とする。〕との組成物である。
本発明の農業用被覆材は、前記プロピレン系重合体組成物から得られる不織布からなる。
本発明の農業用被覆材は、種々公知の不織布の製造方法により製造し得る。本発明の農業用被覆材として、スパンボンド不織布を用いる場合はスパンボンド不織布の製造方法より製造される。
不織布から、機械方向(MD) 100mm×横方向(CD)100mmで10点採取し、平均値を算出した。
スパンボンド不織布層については、得られた不織布から、10mm×10mmの試験片を10点採取し、Nikon社製ECLIPSE E400顕微鏡を用い、倍率20倍で、繊維の直径をμm単位で小数点第1位まで読み取った。1試験片毎に任意の20箇所の径を測定し、平均値を求めた。メルトブローン層については、得られた不織布から試料片を採取して、走査型電子顕微鏡を用いて、倍率500倍または1000倍で観察し、構成繊維の30本の繊維径(μm)を測定し、平均値を求めた。
JIS L 1906に準拠して測定した。農業被覆材から200mm(MD)×50mm(CD)の試験片を採取し、引張試験機(島津製作所オートグラフAGS-J)を用いてチャック間距離100mm、ヘッドスピード100mm/minでMD:5点、CD:5点を測定し、平均値を算出し、引張強度(N/50mm)および引張伸度(%)を求めた。
農業用被覆材から200mm(MD)×50mm(CD)の試験片を採取し、2枚重ねた状態で、JISL1096に準じたフラジール通気度測定機によって行った。得られた数値を2で割ったもの(n=5)の平均値を測定値とした。
財団法人日本化学繊維検査協会の透光率試験法により、具体的にはサークルライン白色20W灯の下方に縦32cm、横32cm、高さ45cmの箱を設備する。
(6)糸ホツレ試験
(6-1)初期の糸ホツレ耐久回数
ASTM D-5264に準拠して、農業被覆材から150mm(MD)×150mm(CD)の試験片を採取し、Sutherland Ink Rub Tester試験機の試料ホルダーに取り付け、#400のサンドペーパーを用いて、無荷重の状態で糸のホツレ(熱エンボス部から糸がほつれて浮き上がる状態)が観察されるまでに必要な摩擦回数を測定した。この測定を5回繰り返して得られた平均値を初期の糸ホツレ耐久回数とした。
農業被覆材から200mm(MD)×50mm(CD)の試験片(n=5)を採取し、高強度キセノンランプ(放射照度180W/m2)にて、60℃、234時間照射した後のサンプルについて、Sutherland Ink Rub Tester試験機の試料ホルダーに取り付け、#400のサンドペーパーを用いて、無荷重の状態で糸のホツレ(熱エンボス部から糸がほつれて浮き上がる状態)が観察されるまでに必要な摩擦回数を測定した。この測定を5回繰り返して得られた平均値を促進処理後の糸ホツレ耐久回数とした。
農業用被覆材用い、3条×5m×畝幅90cmにて、レタスのベタ掛け栽培を12月播種、翌年3月収穫にて実施した。播種後発芽が5割以上揃った時点で一斉にベタ掛け材を外して、発芽数/播種数を発芽率としてカウント、算出した。
MFR:20g/10分、Mw/Mn:4.2のプロピレン単独重合体(PP1)96質量%、高密度ポリエチレン(PE1、プライムポリマー(株)製 製品名「ハイゼックスHZ2200J」、MFR=5g/10分、密度0.964g/cm3)4質量%を用い230℃にて溶融紡糸を行い、得られた繊維を補集面上に堆積させ、繊維径が40μm、目付が20g/m2のスパンボンド不織布農業用被覆材を得た。得られた農業用被覆材を上記記載の方法で評価した。結果を表1に示す。
表1に記載の組成比、繊維径及び目付を有するスパンボンド不織布とした以外は、実施例1と同様に行い、農業用被覆材を得た。
表1に記載の組成比、繊維径及び目付を有するスパンボンド不織布とした以外は、実施例1と同様に行い、農業用被覆材を得た。
実施例1で用いた高密度ポリエチレン(PE1)のみを用いてスパンボンド不織布からなる農業用被覆材を作製しようとしたが、糸切れが発生して不織布を得ることが出来なかった。
高密度ポリエチレン(PE2,プライムポリマー(株)製 製品名 「ネオゼックスNZ50302」、密度0.950g/cm3、MFR=30g/10分)のみを用い、表1に記載の繊維径及び目付を有するスパンボンド不織布農業用被覆材を得た。
芯部に、ポリエステル系重合体としてポリエチレンテレフタレート〔PET1、三井化学(株)製 製品名J125〕を用い、鞘部に高密度ポリエチレン(PE2)を用い、複合溶融紡糸を行い、芯比率が50重量%(芯部:鞘部の重量比が50:50)である芯鞘型複合繊維を捕集面上に堆積させスパンボンド不織布農業用被覆材を得た。不織布の強度は良好であったが、伸度が不足した。また促進後や使用後に、鞘部が芯部と分離する形で熱エンボス部の破壊が発生して、耐久性に劣る結果となった。
芯部にMFR=60g/10分のプロピレン単独重合体(PP2)を用い、鞘部に高密度ポリエチレン(PE-2)を用い、複合溶融紡糸を行い、芯比率が20重量%(芯部:鞘部の重量比が20:80)である同芯の芯鞘型複合繊維を捕集面上に堆積させスパンボンド不織布農業用被覆材を得た。不織布の強度、伸度が不足した。また促進後や使用後に、鞘部が芯部と分離する形で熱エンボス部の破壊が発生して、耐久性に劣る結果となった。
Claims (9)
- プロピレン系重合体(A)90~98質量%及びエチレン系重合体(B)10~2質量%〔但し、(A)+(B)=100質量%とする。〕とのプロピレン系重合体組成物から得られる不織布からなる農業用被覆材。
- 不織布がスパンボンド不織布である請求項1記載の農業用被覆材。
- エチレン系重合体(B)が、密度が0.94~0.97g/cm3の範囲にある高密度ポリエチレンである請求項1記載の農業用被覆材。
- 光線透過率が70%以上である請求項1~3の何れかに記載の農業用被覆材。
- 目付が10~30g/m2である請求項1~4の何れかに記載の農業用被覆材。
- 農業用被覆材が、熱圧着部を有することを特徴とする請求項1~5の何れかに記載の農業用被覆材。
- 農作物を請求項1~6の何れかに記載の農業用被覆材で覆ってなる農作物の育成方法。
- プロピレン系重合体(A)90~98質量%及びエチレン系重合体(B)10~2質量%〔但し、(A)+(B)=100質量%とする。〕とのプロピレン系重合体組成物を紡糸ノズルから紡糸し、紡出された長繊維フィラメントを冷却流体などにより冷却し、延伸空気によってフィラメントに張力を加えて所定の繊度とし、得られたフィラメントを移動する捕集ベルト上に集めてスパンボンド不織布からなる農業用被覆材の製造方法。
- スパンボンド不織布を得た後に、当該スパンボンド不織布を部分的に熱圧着して熱圧着部を形成することを特徴とする請求項8記載の農業用被覆材の製造方法。
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JP2016113704A (ja) * | 2014-12-11 | 2016-06-23 | ユニチカ株式会社 | 農業用被覆資材 |
JP2017079647A (ja) * | 2015-10-28 | 2017-05-18 | ユニチカ株式会社 | 農業用被覆資材 |
KR20170065588A (ko) | 2014-10-30 | 2017-06-13 | 미쓰이 가가쿠 가부시키가이샤 | 스펀본드 부직포, 부직포 적층체, 의료용 의료, 드레이프, 및 멜트블론 부직포 |
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