CN111421904A - High-permeability back film for standing type dehumidifying bag and preparation method thereof - Google Patents

High-permeability back film for standing type dehumidifying bag and preparation method thereof Download PDF

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Publication number
CN111421904A
CN111421904A CN202010227519.9A CN202010227519A CN111421904A CN 111421904 A CN111421904 A CN 111421904A CN 202010227519 A CN202010227519 A CN 202010227519A CN 111421904 A CN111421904 A CN 111421904A
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China
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woven fabric
plain
layer
fabric layer
permeability
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Chinese (zh)
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毛兵
李文峰
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Jiaxing Xingyue Packaging Materials Co ltd
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Jiaxing Xingyue Packaging Materials Co ltd
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Priority to CN202010227519.9A priority Critical patent/CN111421904A/en
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
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    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F1/00—General methods for the manufacture of artificial filaments or the like
    • D01F1/02—Addition of substances to the spinning solution or to the melt
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    • D—TEXTILES; PAPER
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    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
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Abstract

The invention discloses a high-transmittance back film for a standing type dehumidifying bag, which comprises a plain woven fabric layer I, a polyester filament plain woven fabric layer II and a polyester filament plain woven fabric layer III, wherein the gram weight of the polyester filament plain woven fabric layer I is 30-60 g/m 2; the plain non-woven fabric layer II is arranged below the plain non-woven fabric layer, and a polypropylene high-permeability film layer and a breathable polyethylene layer are sequentially arranged between the plain non-woven fabric layer I and the plain non-woven fabric layer II; the second plain-weave non-woven fabric layer is a PET/PE double-component plain-weave non-woven fabric layer, and the gram weight is 25-50 g/m 2; the polypropylene high-permeability film layer has a pore structure, and the pore space is 0.05-0.07 um; the air permeability of the air-permeable polyethylene layer is 100-500 sec/100ml, and the moisture permeability of the air-permeable polyethylene layer is 1500-2500 g/m2 & 24 h. The high-permeability back membrane for the standing-type dehumidification bag has good air permeability; has high water permeability; the heat sealing performance and the heat sealing strength are high; high temperature resistance; also has good mechanical strength, tear resistance and comprehensive mechanical property.

Description

High-permeability back film for standing type dehumidifying bag and preparation method thereof
Technical Field
The invention relates to the technical field of packaging materials, in particular to a high-permeability back film for a standing type dehumidifying bag and a preparation method thereof.
Background
The currently used dehumidifying articles are various in types, and a dehumidifying bag and a dehumidifying box are common. The common dehumidifying hanging bag is generally divided into an upper cavity and a lower cavity, the upper cavity stores a drying agent, the lower cavity is a water storage cavity, the surface of one side of the upper cavity is made of a breathable and waterproof material and can adsorb air, the rest upper cavity and the rest lower cavity are made of plastic materials, and the sides of the cavities are connected and sealed in a heat sealing mode. The joints of the upper cavity and the lower cavity are also connected in a heat seal mode, and a plurality of through holes are arranged at the joints and are communicated with the upper cavity and the lower cavity. When the desiccant absorbs moisture in the air, the moisture flows into the lower water storage cavity through the through holes.
In the prior art, the high-permeability back film for the dehumidification bag has the following defects: 1) in the process of preparing the dehumidifying bag from the film material, the dehumidifying bag is not easy to be heat-sealed; or the heat sealing performance is not good, and the leakage is easy to occur after the product is made by heat sealing; 2) the water vapor permeability is low, the air permeability is poor, the comprehensive use effect is not good, and finally the drying effect of the dehumidification bag is not good.
Based on the situation, the invention provides the high-permeability back membrane for the standing-type dehumidification bag and the preparation method thereof, and the problems can be effectively solved.
Disclosure of Invention
The invention aims to provide a high-permeability back film for a standing type dehumidifying bag and a preparation method thereof. The high-permeability back membrane for the standing type dehumidification bag adopts the special plain woven fabric layer I, the polypropylene high-permeability film layer, the breathable polyethylene layer and the plain woven fabric layer II, and 4 layers of the high-permeability back membrane are optimized in structure, so that the high-permeability back membrane for the standing type dehumidification bag is good in breathability, free of powder leakage and suitable for packaging of a drying agent; the waterproof paint has high water permeability, can allow water vapor permeability (high permeability), and has good barrier effect (waterproof) on liquid water; the heat sealing performance and the heat sealing strength are high; the heat sealing device is high-temperature resistant, and the phenomenon of adhesion to heat sealing mechanical equipment can not occur during heat sealing; the composite material also has good mechanical strength, tear resistance and comprehensive mechanical property; in addition, simple structure, the manufacturing of being convenient for, and convenient to use.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a high-permeability back film for a standing type dehumidifying bag comprises a plain woven fabric layer I, a polypropylene high-permeability film layer, a breathable polyethylene layer and a plain woven fabric layer II;
the plain non-woven fabric layer I is a polyester filament plain non-woven fabric layer with the gram weight of 30-60 g/m2；
Polyester filament plain woven fabric in above structure, ventilative, moisture permeability is good, and is high temperature resistant, when carrying out the heat-seal, the phenomenon of bonding on heat-seal mechanical equipment can not appear, and mechanical strength is high, and is tear-resistant, is difficult for suffering destruction in the use.
The plain non-woven fabric layer II is arranged below the plain non-woven fabric layer, and a polypropylene high-permeability film layer, a polypropylene high-permeability film layer and a polypropylene high-permeability film layer are sequentially arranged between the plain non-woven fabric layer I and the plain non-woven fabric layer II,A breathable polyethylene layer; the second plain-weave non-woven fabric layer is a PET/PE double-component plain-weave non-woven fabric layer, and the gram weight of the second plain-weave non-woven fabric layer is 25-50 g/m2；
The PET/PE bi-component plain non-woven fabric in the structure has good air permeability, good heat sealing performance and high heat sealing strength, the single PET has poor heat sealing performance, and the single PE has good heat sealing performance but low heat sealing strength and is easy to damage in the practical process; in addition, the composite material also has higher tensile strength and good mechanical property.
The polypropylene high-permeability film layer has a pore structure, and the pore space is 0.05-0.07 um; the thickness of the polypropylene high-permeability film is 25-32 um;
the polypropylene high-permeability film with the structure has good water vapor permeability (high permeability) and good barrier effect (waterproof) on liquid water.
In the structure above the thickness of the polypropylene high-permeability membrane is 25 ~ 32um, cooperates with the aforesaid micropore pore structure, has guaranteed good vapor permeability (high permeability) better, and has good barrier effect (waterproof) to liquid water, makes the waterproof nature and the high permeability of product reach optimum balance.
The air permeability of the air-permeable polyethylene layer is 100-500 sec/100ml, and the moisture permeability of the air-permeable polyethylene layer is 1500-2500 g/m2·24h；
The breathable polyethylene layer with the structure has good air permeability and moisture permeability (has good water vapor permeability (high permeability) and good barrier effect on liquid water).
The PET/PE double-component plain non-woven fabric layer is prepared from the following raw materials in parts by weight:
55-65 parts of low-density polyethylene,
25-30 parts of polyethylene glycol terephthalate,
13-16 parts of polyamide,
5-7 parts of nano filler.
The PET/PE bi-component plain non-woven fabric in the structure can ensure good air permeability, has good heat sealing performance and high heat sealing strength which is larger than 15N/15 mm.
The high-permeability back membrane for the standing type dehumidification bag adopts the special plain woven fabric layer I, the polypropylene high-permeability film layer, the breathable polyethylene layer and the plain woven fabric layer II, and 4 layers of the high-permeability back membrane are optimized in structure, so that the high-permeability back membrane for the standing type dehumidification bag is good in breathability, free of powder leakage and suitable for packaging of a drying agent; the waterproof paint has high water permeability, can allow water vapor permeability (high permeability), and has good barrier effect (waterproof) on liquid water; the heat sealing performance and the heat sealing strength are high; the heat sealing device is high-temperature resistant, and the phenomenon of adhesion to heat sealing mechanical equipment can not occur during heat sealing; the composite material also has good mechanical strength, tear resistance and comprehensive mechanical property; in addition, simple structure, the manufacturing of being convenient for, and convenient to use.
Preferably, the PET/PE bicomponent plain non-woven fabric layer is prepared from the following raw materials in parts by weight:
60 portions of low-density polyethylene,
28 parts of polyethylene glycol terephthalate,
15 parts of polyamide,
And 6 parts of nano filler.
Preferably, the nano-filler is nano calcium carbonate.
Preferably, an adhesive layer is arranged between any two of the plain weave non-woven fabric layer I, the polypropylene high-permeability film layer, the breathable polyethylene layer and the plain weave non-woven fabric layer II, and the adhesive layer is used for bonding and compounding of all the layers.
Preferably, any two layers of the plain weave non-woven fabric layer I, the polypropylene high-permeability film layer, the breathable polyethylene layer and the plain weave non-woven fabric layer II are compounded in a dry mode.
Preferably, the thickness of the plain weave non-woven fabric layer I is 30-60 um.
Not only meets the use requirements of mechanical property and the like of the product (high-transparency back film), but also saves raw materials, and the cost performance of the product is optimal.
Preferably, the thickness of the breathable polyethylene layer is 25-45 um.
Better ensures good water vapor permeability (high permeability), and has good barrier effect (waterproof) on liquid water, so that the waterproof property and the high permeability of the product reach the optimal balance.
Preferably, the thickness of the second plain weave non-woven fabric layer is 25-50 um.
Not only meets the use requirements of the product such as heat sealing performance and the like, but also saves raw materials, and achieves the best cost performance of the product.
The invention also provides a preparation method of the high-permeability back film for the standing type dehumidifying bag, which comprises the following steps:
s1, preparing a plain non-woven fabric layer II
Weighing the raw materials of the PET/PE double-component plain non-woven fabric layer in parts by weight, putting the raw materials into a double-screw extruder, and carrying out melt extrusion molding to obtain a plain non-woven fabric layer II;
s2, coating an adhesive between the plain-weave non-woven fabric layer I and the polypropylene high-permeability film layer to form an adhesive layer, and compounding the plain-weave non-woven fabric layer I and the polypropylene high-permeability film layer together by using a dry compounding machine to obtain a semi-finished product I;
s3, coating an adhesive between the breathable polyethylene layer and the second plain non-woven fabric layer to form an adhesive layer, and compounding the breathable polyethylene layer and the second plain non-woven fabric layer together by using a dry compounding machine to obtain a semi-finished product II;
s4, coating an adhesive between the first semi-finished product and the second semi-finished product to form an adhesive layer, compounding the first semi-finished product and the second semi-finished product together by using a dry compounding machine, and curing to obtain the high-transmittance back film for the standing type dehumidifying bag;
wherein, the step S2 and the step S3 have no sequence.
Preferably, in step S1, the heating section of the twin-screw extruder is 6 sections, and the heating temperature is 170 to 180 ℃, 185 to 190 ℃, 188 to 192 ℃, 195 to 200 ℃, 202 to 205 ℃ in sequence.
Preferably, in step S4, the aging is performed continuously for 24 hours at a temperature of 55 to 60 ℃.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the high-permeability back membrane for the standing type dehumidification bag adopts the special plain woven fabric layer I, the polypropylene high-permeability film layer, the breathable polyethylene layer and the plain woven fabric layer II, and 4 layers of the high-permeability back membrane are optimized in structure, so that the high-permeability back membrane for the standing type dehumidification bag is good in breathability, free of powder leakage and suitable for packaging of a drying agent; the waterproof paint has high water permeability, can allow water vapor (steam) to permeate (high permeability), and has good barrier effect (waterproof) on liquid water; the heat sealing performance and the heat sealing strength are high; the heat sealing device is high-temperature resistant, and the phenomenon of adhesion to heat sealing mechanical equipment can not occur during heat sealing; the composite material also has good mechanical strength, tear resistance and comprehensive mechanical property; in addition, simple structure, the manufacturing of being convenient for, and convenient to use.
The high-permeability back film for the standing type dehumidification bag has high air permeability and high moisture permeability, and can be used for containing drying agents such as CaCl2 particles and the like after the standing type dehumidification bag is manufactured, and the drying agents become liquid after absorbing moisture.
Drawings
Fig. 1 is a schematic structural view of the present invention.
In the figure, 1-plain weave non-woven fabric layer I, 2-polypropylene high-permeability film layer, 3-breathable polyethylene layer, 4-plain weave non-woven fabric layer II and 5-adhesive layer.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present invention, the following description of the preferred embodiments of the present invention is provided in connection with specific examples, which should not be construed as limiting the present patent.
The test methods or test methods described in the following examples are conventional methods unless otherwise specified; the reagents and materials, unless otherwise indicated, are conventionally obtained commercially or prepared by conventional methods.
In the present invention, PET is polyethylene terephthalate; PE is polyethylene.
Example 1:
a high-permeability back film for a standing type dehumidifying bag comprises a plain woven fabric layer I, a polypropylene high-permeability film layer, a breathable polyethylene layer and a plain woven fabric layer II;
the first plain weave non-woven fabric layer is a polyester filament plain weave non-woven fabric layer, and the gram weight is 30-60 g/m 2;
the plain non-woven fabric layer II is arranged below the plain non-woven fabric layer, and a polypropylene high-permeability film layer and a breathable polyethylene layer are sequentially arranged between the plain non-woven fabric layer I and the plain non-woven fabric layer II; the second plain-weave non-woven fabric layer is a PET/PE double-component plain-weave non-woven fabric layer, and the gram weight of the second plain-weave non-woven fabric layer is 25-50 g/m 2;
the polypropylene high-permeability film layer has a pore structure, and the pore space is 0.05-0.07 um; the thickness of the polypropylene high-permeability film is 25-32 um;
the air permeability of the air-permeable polyethylene layer is 100-500 sec/100ml, and the moisture permeability of the air-permeable polyethylene layer is 1500-2500 g/m2 & 24 h;
the PET/PE double-component plain non-woven fabric layer is prepared from the following raw materials in parts by weight:
55-65 parts of low-density polyethylene,
25-30 parts of polyethylene glycol terephthalate,
13-16 parts of polyamide,
5-7 parts of nano filler.
Preferably, the PET/PE bicomponent plain non-woven fabric layer is prepared from the following raw materials in parts by weight:
60 portions of low-density polyethylene,
28 parts of polyethylene glycol terephthalate,
15 parts of polyamide,
And 6 parts of nano filler.
Preferably, the nano-filler is nano calcium carbonate.
Preferably, an adhesive layer is arranged between any two of the plain weave non-woven fabric layer I, the polypropylene high-permeability film layer, the breathable polyethylene layer and the plain weave non-woven fabric layer II, and the adhesive layer is used for bonding and compounding of all the layers.
Preferably, any two layers of the plain weave non-woven fabric layer I, the polypropylene high-permeability film layer, the breathable polyethylene layer and the plain weave non-woven fabric layer II are compounded in a dry mode.
Preferably, the thickness of the plain weave non-woven fabric layer I is 30-60 um.
Preferably, the thickness of the breathable polyethylene layer is 25-45 um.
Preferably, the thickness of the second plain weave non-woven fabric layer is 25-50 um.
The invention also provides a preparation method of the high-permeability back film for the standing type dehumidifying bag, which comprises the following steps:
s1, preparing a plain non-woven fabric layer II
Weighing the raw materials of the PET/PE double-component plain non-woven fabric layer in parts by weight, putting the raw materials into a double-screw extruder, and carrying out melt extrusion molding to obtain a plain non-woven fabric layer II;
s2, coating an adhesive between the plain-weave non-woven fabric layer I and the polypropylene high-permeability film layer to form an adhesive layer, and compounding the plain-weave non-woven fabric layer I and the polypropylene high-permeability film layer together by using a dry compounding machine to obtain a semi-finished product I;
s3, coating an adhesive between the breathable polyethylene layer and the second plain non-woven fabric layer to form an adhesive layer, and compounding the breathable polyethylene layer and the second plain non-woven fabric layer together by using a dry compounding machine to obtain a semi-finished product II;
s4, coating an adhesive between the first semi-finished product and the second semi-finished product to form an adhesive layer, compounding the first semi-finished product and the second semi-finished product together by using a dry compounding machine, and curing to obtain the high-transmittance back film for the standing type dehumidifying bag;
wherein, the step S2 and the step S3 have no sequence.
Preferably, in step S1, the heating section of the twin-screw extruder is 6 sections, and the heating temperature is 170 to 180 ℃, 185 to 190 ℃, 188 to 192 ℃, 195 to 200 ℃, 202 to 205 ℃ in sequence.
Preferably, in step S4, the aging is performed continuously for 24 hours at a temperature of 55 to 60 ℃.
Example 2:
as shown in fig. 1, the present high-transparency back film includes:
a high-permeability backing film comprising:
the plain non-woven fabric layer 1, the plain non-woven fabric layer 1 is a polyester filament plain non-woven fabric layer;
a plain non-woven fabric layer II 4, wherein the plain non-woven fabric layer II 4 is arranged below the plain non-woven fabric layer I1, a polypropylene high-permeability film layer 2 and a breathable polyethylene layer 3 are sequentially arranged between the plain non-woven fabric layer I1 and the plain non-woven fabric layer II 4, and the plain non-woven fabric layer II 4 is a PET/PE double-component plain non-woven fabric layer;
adhesive layers 5 are arranged among the plain weave non-woven fabric layer I1, the polypropylene high-permeability film layer 2, the breathable polyethylene layer 3 and the plain weave non-woven fabric layer II 4, and are used for bonding of all the layers.
The dehumidifying bag is mainly formed by accommodating a drying agent in a box body and assembling a cover in a covering bag in a covering mode in a sealing mode, and in the prior art, the dehumidifying bag is made of a high-permeability back film which has the following defects: 1) in the process of preparing the dehumidifying bag from the film material, the dehumidifying bag is not easy to be heat-sealed; 2) the air permeability is poor, the comprehensive use effect is not good, and finally the drying effect is not good.
Therefore, the invention designs a high-permeability back membrane for a dehumidification bag, which is suitable for the dehumidification bag, and the specific structure is as follows: comprises a plain weave non-woven fabric layer I1, a polypropylene high-permeability film layer 2, a breathable polyethylene layer 3 and a plain weave non-woven fabric layer II 4 which are arranged in sequence. The layers are bonded through the adhesive, the prepared high-transparency back film is simple in structure, good in comprehensive performance and high in heat-sealing strength due to the arrangement of the outer layer structure, and when the high-transparency back film is prepared into a standing type dehumidifying bag, the high-transparency back film can be subjected to heat sealing, and specifically comprises the following steps: the polyester filament plain non-woven fabric layer is an inner layer and is high-temperature-resistant, breathable and permeable, and the PET/PE double-component plain non-woven fabric layer is an outer layer and is in contact with outside air, can be thermally sealed, and is high in heat sealing strength, breathable and permeable.
Wherein, plain weave non-woven fabrics layer 1 specifically is polyester filament plain weave non-woven fabrics layer, and this layer structure has high temperature resistant, ventilative and pervious function, through the setting of this layer of material for the high temperature resistant and the ventilative water permeability of high back film that passes through promote.
Example 3:
a high-permeability backing film comprising:
the plain non-woven fabric layer 1, the plain non-woven fabric layer 1 is a polyester filament plain non-woven fabric layer;
a plain non-woven fabric layer II 4, wherein the plain non-woven fabric layer II 4 is arranged below the plain non-woven fabric layer I1, a polypropylene high-permeability film layer 2 and a breathable polyethylene layer 3 are sequentially arranged between the plain non-woven fabric layer I1 and the plain non-woven fabric layer II 4, and the plain non-woven fabric layer II 4 is a PET/PE double-component plain non-woven fabric layer;
adhesive layers are arranged among the plain weave non-woven fabric layer I1, the polypropylene high-permeability film layer 2, the breathable polyethylene layer 3 and the plain weave non-woven fabric layer II 4, and the adhesive layers are used for bonding among the layers
Example 2 differs from example 1 only in that: the polypropylene high-permeability film layer 2 is provided with micropores, the diameter of each micropore is a, and the quantity relation a is 0.05-0.07 mu m. (namely "the polypropylene high-permeability membrane layer has a pore structure, and the pore space is 0.05 ~ 0.07 um;", the same below.) in this embodiment, through the setting of the four-layer structure of high-permeability back membrane, wherein, the polypropylene high-permeability membrane layer 2 possesses the ability that the gas of preferred passes through, through the setting of the microporous structure on this layer of structure, specific diameter size range is 0.05 ~ 0.07 mu m for the polypropylene high-permeability membrane layer 2 can see through steam, and liquid water can not see through, and whole air permeability obviously promotes.
Example 4:
a high-permeability backing film comprising:
the plain non-woven fabric layer 1, the plain non-woven fabric layer 1 is a polyester filament plain non-woven fabric layer;
a plain non-woven fabric layer II 4, wherein the plain non-woven fabric layer II 4 is arranged below the plain non-woven fabric layer I1, a polypropylene high-permeability film layer 2 and a breathable polyethylene layer 3 are sequentially arranged between the plain non-woven fabric layer I1 and the plain non-woven fabric layer II 4, and the plain non-woven fabric layer II 4 is a PET/PE double-component plain non-woven fabric layer;
adhesive layers are arranged among the plain weave non-woven fabric layer I1, the polypropylene high-permeability film layer 2, the breathable polyethylene layer 3 and the plain weave non-woven fabric layer II 4, and the adhesive layers are used for bonding among the layers
Example 2 differs from example 1 only in that: the thickness of the plain non-woven fabric layer 1 is 30-60 um, and the gram weight of the plain non-woven fabric layer 1 is 30-60 g/m2。
In this embodiment, the thickness and the grammage of the first plain weave nonwoven fabric layer are respectively: 30-60 um, 30-60 g/m2The gram weight of the plain non-woven fabric layer I1 is set, so that the air permeability and the water permeability are better in the use process of the high-permeability back membrane.
Example 5:
example 3 differs from example 1 only in that: the thickness of the air permeable polyethylene layer 3 is 25-45 um, the air permeability of the air permeable polyethylene layer 3 is 100-500 sec/100ml, and the moisture permeability of the air permeable polyethylene layer 3 is 1500-2500 g/m2·24h。
In this embodiment, ventilative polyethylene layer 3 of breathing freely that the inlayer set up, this layer is ventilative, easy heat-seal and heat-seal strength are lower, cooperate with two ingredient plain weave non-woven fabrics layers of outer PET/PE for this high comprehensive properties who passes through the notacoria is good, conveniently is used for in the stand-type dehumidification bag.
In a further preferred embodiment, the thickness of the plain weave nonwoven fabric layer two 4 is 25 to 50um, and the grammage of the plain weave nonwoven fabric layer two 1 is 25 to 50g/m2。
The utility model provides a stand-type dehumidification bag, makes through high back of body membrane that passes through, and this high back of body membrane that passes through mainly includes four-layer structure, does in proper order: the fabric comprises a plain non-woven fabric layer I1, a polypropylene high-permeability film layer 2, an air-permeable polyethylene layer 3 and a plain non-woven fabric layer II 4, wherein the plain non-woven fabric layer I1 is a polyester filament plain non-woven fabric layer, and the plain non-woven fabric layer II 4 is a PET/PE double-component plain non-woven fabric layer.
Through the high back of body membrane heat-seal that passes through of above-mentioned structure makes the bag body, stand-type dehumidification bag promptly, this stand-type dehumidification bag sealing strength is high, outer structure plain weave nonwoven fabric layer two 4 can permeate gas and permeate water, the high membrane that passes through of polypropylene of middle bilayer structure can permeate gas and steam, can not permeate liquid water, inlayer plain weave nonwoven fabric layer two 4 can permeate gas and permeate water, at the in-process of specific use, gas, steam, liquid water can permeate through the skin, but the setting through the inlayer is with the liquid water separation, only gas and steam can permeate through this high back of body membrane, this stand-type dehumidification bag dampproofing moisture absorption effect is good.
Example 6:
a high-permeability back film for a standing type dehumidifying bag comprises a plain woven fabric layer I, a polypropylene high-permeability film layer, a breathable polyethylene layer and a plain woven fabric layer II;
the first plain weave non-woven fabric layer is a polyester filament plain weave non-woven fabric layer, and the gram weight is 30g/m 2;
the plain non-woven fabric layer II is arranged below the plain non-woven fabric layer, and a polypropylene high-permeability film layer and a breathable polyethylene layer are sequentially arranged between the plain non-woven fabric layer I and the plain non-woven fabric layer II; the second plain-weave non-woven fabric layer is a PET/PE double-component plain-weave non-woven fabric layer, and the gram weight is 25g/m 2;
the polypropylene high-permeability film layer has a pore structure, and the pore space is 0.05-0.07 um; the thickness of the polypropylene high-permeability film is 25 um;
the air permeability of the air-permeable polyethylene layer is 100sec/100ml, and the moisture permeability of the air-permeable polyethylene layer is 1500g/m2 & 24 h;
the PET/PE double-component plain non-woven fabric layer is prepared from the following raw materials in parts by weight:
55 portions of low-density polyethylene,
25 parts of polyethylene glycol terephthalate,
13 parts of polyamide,
And 5 parts of nano filler.
In this embodiment, the nanofiller is nano calcium carbonate.
In this embodiment, an adhesive layer is disposed between any two of the plain weave nonwoven fabric layer one, the polypropylene high-permeability film layer, the breathable polyethylene layer and the plain weave nonwoven fabric layer two, and the adhesive layer is used for bonding and compounding of the layers.
In this embodiment, any two of the plain weave nonwoven fabric layer one, the polypropylene high-permeability film layer, the air-permeable polyethylene layer and the plain weave nonwoven fabric layer two are dry-compounded.
In this embodiment, the thickness of the first plain weave nonwoven fabric layer is 60 um.
In this example, the breathable polyethylene layer has a thickness of 25 um.
In this embodiment, the thickness of the second plain weave nonwoven fabric layer is 50 um.
In this embodiment, the method for preparing the high-transmittance back film for the standing-type dehumidifying bag comprises the following steps:
s1, preparing a plain non-woven fabric layer II
Weighing the raw materials of the PET/PE double-component plain non-woven fabric layer in parts by weight, putting the raw materials into a double-screw extruder, and carrying out melt extrusion molding to obtain a plain non-woven fabric layer II;
s2, coating an adhesive between the plain-weave non-woven fabric layer I and the polypropylene high-permeability film layer to form an adhesive layer, and compounding the plain-weave non-woven fabric layer I and the polypropylene high-permeability film layer together by using a dry compounding machine to obtain a semi-finished product I;
s3, coating an adhesive between the breathable polyethylene layer and the second plain non-woven fabric layer to form an adhesive layer, and compounding the breathable polyethylene layer and the second plain non-woven fabric layer together by using a dry compounding machine to obtain a semi-finished product II;
s4, coating an adhesive between the first semi-finished product and the second semi-finished product to form an adhesive layer, compounding the first semi-finished product and the second semi-finished product together by using a dry compounding machine, and curing to obtain the high-transmittance back film for the standing type dehumidifying bag;
wherein, the step S2 and the step S3 have no sequence.
In this example, in step S1, the heating zone of the twin-screw extruder was 6 stages, and the heating temperature was 170 ℃, 185 ℃, 188 ℃, 195 ℃, 202 ℃ in this order.
In this embodiment, in step S4, the aging is performed specifically by continuously aging at 55 ℃ for 24 h.
Example 7:
a high-permeability back film for a standing type dehumidifying bag comprises a plain woven fabric layer I, a polypropylene high-permeability film layer, a breathable polyethylene layer and a plain woven fabric layer II;
the first plain non-woven fabric layer is a polyester filament plain non-woven fabric layer, and the gram weight is 60g/m 2;
the plain non-woven fabric layer II is arranged below the plain non-woven fabric layer, and a polypropylene high-permeability film layer and a breathable polyethylene layer are sequentially arranged between the plain non-woven fabric layer I and the plain non-woven fabric layer II; the second plain-weave non-woven fabric layer is a PET/PE double-component plain-weave non-woven fabric layer, and the gram weight of the second plain-weave non-woven fabric layer is 50g/m 2;
the polypropylene high-permeability film layer has a pore structure, and the pore space is 0.05-0.07 um; the thickness of the polypropylene high-permeability film is 32 um;
the air permeability of the air-permeable polyethylene layer is 500sec/100ml, and the moisture permeability of the air-permeable polyethylene layer is 2500g/m2 & 24 h;
the PET/PE double-component plain non-woven fabric layer is prepared from the following raw materials in parts by weight:
65 portions of low-density polyethylene,
30 portions of polyethylene glycol terephthalate,
16 portions of polyamide,
7 parts of nano filler.
In this embodiment, the nanofiller is nano calcium carbonate.
In this embodiment, an adhesive layer is disposed between any two of the plain weave nonwoven fabric layer one, the polypropylene high-permeability film layer, the breathable polyethylene layer and the plain weave nonwoven fabric layer two, and the adhesive layer is used for bonding and compounding of the layers.
In this embodiment, any two of the plain weave nonwoven fabric layer one, the polypropylene high-permeability film layer, the air-permeable polyethylene layer and the plain weave nonwoven fabric layer two are dry-compounded.
In this embodiment, the thickness of the first plain weave nonwoven fabric layer is 30 um.
In this example, the thickness of the breathable polyethylene layer is 45 um.
In this embodiment, the thickness of the second plain weave nonwoven fabric layer is 25 um.
In this embodiment, the method for preparing the high-transmittance back film for the standing-type dehumidifying bag comprises the following steps:
s1, preparing a plain non-woven fabric layer II
Weighing the raw materials of the PET/PE double-component plain non-woven fabric layer in parts by weight, putting the raw materials into a double-screw extruder, and carrying out melt extrusion molding to obtain a plain non-woven fabric layer II;
s2, coating an adhesive between the plain-weave non-woven fabric layer I and the polypropylene high-permeability film layer to form an adhesive layer, and compounding the plain-weave non-woven fabric layer I and the polypropylene high-permeability film layer together by using a dry compounding machine to obtain a semi-finished product I;
s3, coating an adhesive between the breathable polyethylene layer and the second plain non-woven fabric layer to form an adhesive layer, and compounding the breathable polyethylene layer and the second plain non-woven fabric layer together by using a dry compounding machine to obtain a semi-finished product II;
s4, coating an adhesive between the first semi-finished product and the second semi-finished product to form an adhesive layer, compounding the first semi-finished product and the second semi-finished product together by using a dry compounding machine, and curing to obtain the high-transmittance back film for the standing type dehumidifying bag;
wherein, the step S2 and the step S3 have no sequence.
In this example, in step S1, the heating zone of the twin-screw extruder was 6 stages, and the heating temperature was 180 ℃, 190 ℃, 192 ℃, 200 ℃, 205 ℃ in this order.
In this embodiment, in step S4, the aging is performed specifically by continuously aging at 60 ℃ for 24 h.
Example 8:
a high-permeability back film for a standing type dehumidifying bag comprises a plain woven fabric layer I, a polypropylene high-permeability film layer, a breathable polyethylene layer and a plain woven fabric layer II;
the first plain weave non-woven fabric layer is a polyester filament plain weave non-woven fabric layer, and the gram weight is 45g/m 2;
the plain non-woven fabric layer II is arranged below the plain non-woven fabric layer, and a polypropylene high-permeability film layer and a breathable polyethylene layer are sequentially arranged between the plain non-woven fabric layer I and the plain non-woven fabric layer II; the second plain-weave non-woven fabric layer is a PET/PE double-component plain-weave non-woven fabric layer, and the gram weight of the second plain-weave non-woven fabric layer is 48g/m 2;
the polypropylene high-permeability film layer has a pore structure, and the pore space is 0.05-0.07 um; the thickness of the polypropylene high-permeability film is 30 um;
the air permeability of the air-permeable polyethylene layer is 300sec/100ml, and the moisture permeability of the air-permeable polyethylene layer is 2000g/m2 & 24 h;
the PET/PE double-component plain non-woven fabric layer is prepared from the following raw materials in parts by weight:
60 portions of low-density polyethylene,
28 parts of polyethylene glycol terephthalate,
15 parts of polyamide,
And 6 parts of nano filler.
In this embodiment, the nanofiller is nano calcium carbonate.
In this embodiment, an adhesive layer is disposed between any two of the plain weave nonwoven fabric layer one, the polypropylene high-permeability film layer, the breathable polyethylene layer and the plain weave nonwoven fabric layer two, and the adhesive layer is used for bonding and compounding of the layers.
In this embodiment, any two of the plain weave nonwoven fabric layer one, the polypropylene high-permeability film layer, the air-permeable polyethylene layer and the plain weave nonwoven fabric layer two are dry-compounded.
In this embodiment, the thickness of the first plain weave nonwoven fabric layer is 45 um.
In this example, the thickness of the breathable polyethylene layer is 35 um.
In this embodiment, the thickness of the second plain weave nonwoven fabric layer is 48 um.
In this embodiment, the method for preparing the high-transmittance back film for the standing-type dehumidifying bag comprises the following steps:
s1, preparing a plain non-woven fabric layer II
Weighing the raw materials of the PET/PE double-component plain non-woven fabric layer in parts by weight, putting the raw materials into a double-screw extruder, and carrying out melt extrusion molding to obtain a plain non-woven fabric layer II;
s2, coating an adhesive between the plain-weave non-woven fabric layer I and the polypropylene high-permeability film layer to form an adhesive layer, and compounding the plain-weave non-woven fabric layer I and the polypropylene high-permeability film layer together by using a dry compounding machine to obtain a semi-finished product I;
s3, coating an adhesive between the breathable polyethylene layer and the second plain non-woven fabric layer to form an adhesive layer, and compounding the breathable polyethylene layer and the second plain non-woven fabric layer together by using a dry compounding machine to obtain a semi-finished product II;
s4, coating an adhesive between the first semi-finished product and the second semi-finished product to form an adhesive layer, compounding the first semi-finished product and the second semi-finished product together by using a dry compounding machine, and curing to obtain the high-transmittance back film for the standing type dehumidifying bag;
wherein, the step S2 and the step S3 have no sequence.
In this embodiment, in step S1, the heating zone of the twin-screw extruder is 6 stages, and the heating temperature is 175 ℃, 187 ℃, 190 ℃, 197 ℃, 199 ℃ and 203 ℃ in this order.
In this embodiment, in step S4, the aging is performed specifically by continuously aging at a temperature of 58 ℃ for 24 hours.
The high-permeability back film for the stand-up type dehumidifying bags prepared in examples 6 to 8 of the present invention was subjected to the following performance test, and the test results are shown in table 1:
TABLE 1
Figure BDA0002428217240000171
As can be seen from the above table, the high-transmittance back film for the stand-up type dehumidifying bag of the present invention has high heat-sealing strength and is easy to heat-seal; the air permeability is high, and the air permeability is good; the water-based paint has the advantages of large moisture permeability, good moisture permeability effect, high water permeability, allowable water vapor (water vapor) permeability (high permeability), and good barrier effect (water resistance) on liquid water.
The high-permeability back film for the standing type dehumidification bag has high air permeability and high moisture permeability, and can be used for containing drying agents such as CaCl2 particles and the like after the standing type dehumidification bag is manufactured, and the drying agents become liquid after absorbing moisture.
The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and these modifications and adaptations should be considered within the scope of the invention.

Claims (10)

1. A high-permeability back film for a standing type dehumidifying bag is characterized by comprising a plain woven fabric layer I (1), a polypropylene high-permeability film layer (2), a breathable polyethylene layer (3) and a plain woven fabric layer II (4);
the plain non-woven fabric layer I (1) is a polyester filament plain non-woven fabric layer with the gram weight of 30-60 g/m2；
The plain non-woven fabric layer II (4) is arranged below the plain non-woven fabric layer I (1), and a polypropylene high-permeability film layer (2) and a breathable polyethylene layer (3) are sequentially arranged between the plain non-woven fabric layer I (1) and the plain non-woven fabric layer II (4); the plain non-woven fabric layer II (4) is a PET/PE double-component plain non-woven fabric layer, and the gram weight of the plain non-woven fabric layer II is 25-50 g/m2；
The polypropylene high-permeability film layer (2) has a pore structure, and the pore space is 0.05-0.07 um; the thickness of the polypropylene high-permeability film is 25-32 um;
the air permeability of the air-permeable polyethylene layer (3) is 100-500 sec/100ml, and the moisture permeability of the air-permeable polyethylene layer (3) is 1500-2500 g/m2·24h；
The PET/PE double-component plain non-woven fabric layer is prepared from the following raw materials in parts by weight:
55-65 parts of low-density polyethylene,
25-30 parts of polyethylene glycol terephthalate,
13-16 parts of polyamide,
5-7 parts of nano filler.
2. The high-transmittance back film for the stand-up dehumidification bag according to claim 1, wherein the PET/PE bi-component plain non-woven fabric layer is made of raw materials in parts by weight as follows:
60 portions of low-density polyethylene,
28 parts of polyethylene glycol terephthalate,
15 parts of polyamide,
And 6 parts of nano filler.
3. The high transmittance backing film for a standing pouch according to claim 2, wherein the nano-filler is nano calcium carbonate.
4. The high-permeability back film for the standing-type dehumidifying bag according to claim 1, wherein an adhesive layer (5) is arranged between any two of the plain-weave nonwoven fabric layer I (1), the polypropylene high-permeability film layer (2), the breathable polyethylene layer (3) and the plain-weave nonwoven fabric layer II (4), and the adhesive layer is used for adhesive compounding between the layers.
5. The high-permeability back film for the standing-type dehumidifying bag according to claim 1, wherein any two of the plain woven fabric layer one (1), the polypropylene high-permeability film layer (2), the air-permeable polyethylene layer (3) and the flat woven fabric layer two (4) are dry-compounded.
6. The high-transmittance back film for a standing-type dehumidifying bag as claimed in claim 1, wherein the thickness of the plain woven fabric layer one (1) is 30 to 60 μm.
7. The high-permeability back film for a standing type dehumidifying bag as claimed in claim 1, wherein the thickness of the air-permeable polyethylene layer (3) is 25-45 um.
8. The high-transmittance back film for a standing-type dehumidifying bag as claimed in claim 1, wherein the thickness of the plain woven fabric layer two (4) is 25 to 50 μm.
9. A method for preparing a high-transmittance back film for a standing-type dehumidifying bag as claimed in any one of claims 1 to 8, comprising the steps of:
s1 preparation of plain weave non-woven cloth layer two (4)
Weighing the raw materials of the PET/PE double-component plain-weave non-woven fabric layer according to the parts by weight, putting the raw materials into a double-screw extruder, and carrying out melt extrusion molding to obtain a plain-weave non-woven fabric layer II (4);
s2, coating an adhesive between the plain woven fabric layer I (1) and the polypropylene high-transparency film layer (2) to form an adhesive layer (5), and compounding the plain woven fabric layer I (1) and the polypropylene high-transparency film layer (2) together by using a dry compounding machine to obtain a semi-finished product I;
s3, coating an adhesive between the breathable polyethylene layer (3) and the second (4) of the two-ply non-woven fabric layer to form an adhesive layer (5), and compounding the breathable polyethylene layer (3) and the second (4) of the two-ply non-woven fabric layer together by using a dry compounding machine to obtain a second semi-finished product;
s4, coating an adhesive between the first semi-finished product and the second semi-finished product to form an adhesive layer (5), compounding the first semi-finished product and the second semi-finished product by using a dry compounding machine, and curing to obtain the high-transmittance back film for the standing type dehumidifying bag;
wherein, the step S2 and the step S3 have no sequence.
10. The high-permeability back film for the stand-up dehumidification bag as claimed in claim 1, wherein in step S1, the heating section of the twin-screw extruder is 6 sections, and the heating temperature is 170-180 ℃, 185-190 ℃, 188-192 ℃, 195-200 ℃, 202-205 ℃ in sequence; in the step S4, the curing is performed continuously for 24 hours at a temperature of 55-60 ℃.
CN202010227519.9A 2020-03-27 2020-03-27 High-permeability back film for standing type dehumidifying bag and preparation method thereof Pending CN111421904A (en)

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