CN108715055B - Manufacturing method of high-breathability woven bag - Google Patents
Manufacturing method of high-breathability woven bag Download PDFInfo
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- CN108715055B CN108715055B CN201810499118.1A CN201810499118A CN108715055B CN 108715055 B CN108715055 B CN 108715055B CN 201810499118 A CN201810499118 A CN 201810499118A CN 108715055 B CN108715055 B CN 108715055B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B70/00—Making flexible containers, e.g. envelopes or bags
- B31B70/60—Uniting opposed surfaces or edges; Taping
- B31B70/64—Uniting opposed surfaces or edges; Taping by applying heat or pressure
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- C—CHEMISTRY; METALLURGY
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
- C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
- C08J9/102—Azo-compounds
- C08J9/103—Azodicarbonamide
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/08—Copolymers of ethene
- C08L23/0846—Copolymers of ethene with unsaturated hydrocarbons containing other atoms than carbon or hydrogen atoms
- C08L23/0853—Vinylacetate
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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
- D01F1/10—Other agents for modifying properties
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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
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/44—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds
- D01F6/46—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds of polyolefins
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B2160/00—Shape of flexible containers
- B31B2160/10—Shape of flexible containers rectangular and flat, i.e. without structural provision for thickness of contents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B2170/00—Construction of flexible containers
- B31B2170/20—Construction of flexible containers having multi-layered walls, e.g. laminated or lined
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/04—N2 releasing, ex azodicarbonamide or nitroso compound
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/06—Polyethene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2403/00—Characterised by the use of starch, amylose or amylopectin or of their derivatives or degradation products
- C08J2403/04—Starch derivatives
- C08J2403/10—Oxidised starch
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Abstract
The invention provides a method for manufacturing a high-permeability woven bag, which comprises a polypropylene woven bag, an EVA (ethylene vinyl acetate) film layer and a polyethylene film layer from outside to inside in sequence, and comprises the following steps: s1: blending and drying raw materials; s2: a wire drawing process; s3: a foaming process; s4: then adding 80-90% of EVA and 10-20% of foaming agent into a double-layer co-extrusion blown film machine, heating, melting and blowing to form cylindrical two-layer inner mucosa, wherein the outer layer is an EVA film layer, and the inner layer is a foamed polyethylene film layer; s5: a knitting process; s6: compounding; s7: and (6) making bags. The invention aims to provide a manufacturing method of a high-permeability woven bag for containing living matters such as fruits, seeds, saplings and the like, which has good air permeability and good water-resisting effect.
Description
Technical Field
The invention relates to the technical field of plastic woven bag processing, in particular to a manufacturing method of a high-breathability woven bag.
Background
The plastic woven bag is made by using polypropylene as a main raw material through extrusion, wire drawing, weaving, knitting and bag making. Plastic woven bags are often used to contain materials that cannot be affected with moisture, such as flour, seeds, sugar, fruits and vegetables, saplings, fertilizers, chemical reagents, and the like, so that the plastic bags are required to have a waterproof and moistureproof inner adhesive film. At present, the woven bags containing the inner mucosa are produced in large quantities in China by manually sleeving the woven plastic outer bag and the single-layer lining film bag together, the production efficiency is low, the labor cost is high, the lining film is a waterproof and moistureproof polyethylene film, but the existing polyethylene film prevents air circulation while being waterproof and moistureproof, fruits, seeds, saplings and other living things needing oxygen are usually rotten and die to cause economic loss due to no oxygen circulation when the plastic woven bags are filled with the fruits, the seeds, the saplings and other living things, and therefore the moisture-proof and breathable inner mucosa plastic woven bag and the manufacturing method thereof need to be developed to fill the fruits, the seeds, the saplings and other living things.
Disclosure of Invention
The invention aims to provide a manufacturing method of a high-permeability woven bag for containing living matters such as fruits, seeds, saplings and the like, which has good air permeability and good water-resisting effect.
The invention provides a method for manufacturing a high-permeability woven bag, wherein an inner-mucosa woven bag sequentially comprises a polypropylene woven bag, an EVA film layer and a polyethylene film layer from outside to inside, and the method comprises the following steps:
s1: blending and drying raw materials: putting the polypropylene particles, the filling master batch and the auxiliary agent into a drying stirrer, and stirring and drying;
s2: the wire drawing process comprises the following steps: feeding the material subjected to blending drying in the step S1 into an extruder, heating the material by a charging barrel and shearing a screw and a machine barrel, molding and extruding the material into a film by a die head, cooling the film by water at 30-40 ℃, cutting the film into blank wires by a blade, stretching the blank wires by a drying plate to form flat wires, and winding the flat wires into coils by a wire winding machine after the flat wires are subjected to heat setting;
s3: the foaming process comprises the following steps: 75-90% of low-density polyethylene, 9-20% of potato oxidized starch and 1-5% of AC foaming agent are added into a double-layer co-extrusion blown film machine for heating, melting and stirring to form a foamed polyethylene melt;
s4: then adding 80-90% of EVA and 10-20% of foaming agent into a double-layer co-extrusion blown film machine, heating, melting and blowing to form cylindrical two-layer inner mucosa, wherein the outer layer is an EVA film layer, and the inner layer is a foamed polyethylene film layer;
s5: a knitting procedure: weaving the coiled flat filaments into a cylindrical woven bag by a circular weaving machine, and sleeving a double-layer inner adhesive film in the cylindrical woven bag after inspection and qualification inspection, and then rolling by a rolling machine;
s6: a compounding procedure: the woven bag sleeved with the inner adhesive film passes through an inner adhesive film compounding machine, the EVA film layer is heated and melted to have viscosity, the foaming agent of the EVA film layer is heated and decomposed to form a foaming EVA film layer, and the foaming EVA film layer bonds the foaming polyethylene film layer and the woven bag into a well-bonded inner adhesive film woven bag;
s7: bag making: and (5) printing, cutting and sewing the inner adhesive film woven bag bonded in the step (S5) into a finished product plastic woven bag with the inner adhesive film.
As a further improvement of the invention, the heating temperature in the step S3 is 80-90 ℃.
As a further improvement of the present invention, the heating temperature in step S6 is 90-100 ℃.
In a further development of the invention, the blowing agent is sodium bicarbonate.
As a further improvement of the present invention, the raw material components for preparing the EVA film layer in step S3 are EVA 85% and a foaming agent 15%, and the raw material components for preparing the polyethylene layer are foamed polyethylene 83%, potato oxidized starch 15% and an AC foaming agent 2%.
Compared with the prior art, the invention has the following beneficial effects:
1. the inner adhesive film is formed by heating, melting and blow-molding the foamed polyethylene, potato oxidized starch and a dispersing agent, wherein the potato oxidized starch is added into the foamed polyethylene film, a plurality of fine pores are formed in the potato oxidized starch, and the peripheries of the potato oxidized starch particles can form more communicated fine pores or channels, and a net-shaped structure is formed between the fine pores and the pores in the foamed polyethylene, so that the whole polyethylene film has excellent gas permeability, the substance with a large compression coefficient, namely gas, can be rapidly diffused through the polyethylene film, the diameter of the holes which is better than that of the film is small, and water drops can be effectively prevented from passing through the pores, therefore, the inner polyethylene film can play a role of ventilation and moisture prevention, and can be used for containing fruits, vegetables and the like for a long time, The oxygen circulation supply of the needed living things such as seeds, saplings and the like is kept, the survival time of the living things is prolonged, and the loss is reduced.
2. The polarity of polyethylene is very weak, so that the EVA film layer is required to bond and fasten the polyethylene film layer and the polypropylene woven bag, the EVA film layer is heated and melted by adopting EVA and a foaming agent, the foaming agent is not decomposed to generate gas, the foaming agent is uniformly dispersed in the EVA film layer, when the EVA film layer enters an inner adhesive film compounding machine for heating, the EVA is heated and melted, but the temperature does not reach the melting temperature of polyethylene, the EVA tightly bonds the inner polyethylene film layer and the polypropylene woven bag, the foaming agent in the EVA film layer is decomposed by heating to generate a large amount of gas, a large number of holes with large diameters are formed in the EVA film layer, the bonding effect of the EVA can be exerted, and external gas can rapidly pass through the EVA film.
3. The polyethylene film adopts potato oxidized starch, the oxidized starch is modified starch obtained by oxidizing starch under the action of an oxidant in acid, alkali and neutral media, the oxidized starch is a product degraded by acid and alkali treatment, the molecular weight of the oxidized starch is smaller than that of the starch, the amount of the oxidized starch in the film can be more than that of the starch, more fine pores are formed, the air permeability of the film is better, the hydroxyl in the starch is methylated to form hydroxymethyl, the acting force between the hydroxyl and water molecules is reduced, and the hydrophobic property of the polyethylene film is further improved.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to specific embodiments. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
The invention discloses a method for manufacturing a high-breathability woven bag, and the specific embodiment is as follows.
Example 1
A method for manufacturing a high-permeability woven bag, which comprises a polypropylene woven bag, an EVA film layer and a polyethylene film layer from outside to inside in sequence, comprises the following steps:
s1: blending and drying raw materials: putting 100kg of polypropylene particles, 10kg of filling master batch and 20g of antioxidant into a drying stirrer, and stirring and drying;
s2: the wire drawing process comprises the following steps: feeding the material subjected to blending drying in the step S1 into an extruder, heating the material by a charging barrel and shearing a screw and a machine barrel, molding and extruding the material into a film by a die head, cooling the film by water at 30-40 ℃, cutting the film into blank wires by a blade, stretching the blank wires by a drying plate to form flat wires, and winding the flat wires into coils by a wire winding machine after the flat wires are subjected to heat setting;
s3: the foaming process comprises the following steps: 20kg of low-density polyethylene, 5.3kg of potato oxidized starch and 1.3kg of AC foaming agent are added into a double-layer co-extrusion blown film machine to be heated to 80 ℃, melted and stirred to form a foamed polyethylene melt;
s4: then adding EVA20kg and foaming agent sodium hydroxide 5kg into a double-layer co-extrusion blow molding film machine, melting at 80 ℃, and blow molding to form two cylindrical inner mucosa, wherein the outer layer is an EVA film layer, and the inner layer is a foamed polyethylene film layer;
s5: a knitting procedure: weaving the coiled flat filaments into a cylindrical woven bag by a circular weaving machine, and sleeving a double-layer inner adhesive film in the cylindrical woven bag after inspection and qualification inspection, and then rolling by a rolling machine;
s6: a compounding procedure: the woven bag sleeved with the inner adhesive film passes through an inner adhesive film compounding machine, the EVA film layer is heated to 90 ℃ through the compounding machine, the EVA film layer is heated and melted to have viscosity at the temperature, and sodium hydroxide of the EVA film layer is heated and decomposed to form a foaming EVA film layer so as to bond the foaming polyethylene film layer and the woven bag into a well-bonded inner adhesive film woven bag;
s6: bag making: and (5) printing, cutting and sewing the inner adhesive film woven bag bonded in the step (S5) into a finished product plastic woven bag with the inner adhesive film.
Example 2
A method for manufacturing a high-permeability woven bag, which comprises a polypropylene woven bag, an EVA film layer and a polyethylene film layer from outside to inside in sequence, comprises the following steps:
s1: blending and drying raw materials: putting 100kg of polypropylene particles, 10kg of filling master batch and 20g of antioxidant into a drying stirrer, and stirring and drying;
s2: the wire drawing process comprises the following steps: feeding the material subjected to blending drying in the step S1 into an extruder, heating the material by a charging barrel and shearing a screw and a machine barrel, molding and extruding the material into a film by a die head, cooling the film by water at 30-40 ℃, cutting the film into blank wires by a blade, stretching the blank wires by a drying plate to form flat wires, and winding the flat wires into coils by a wire winding machine after the flat wires are subjected to heat setting;
s3: the foaming process comprises the following steps: 20kg of low-density polyethylene, 2kg of potato oxidized starch and 200g of AC foaming agent are added into a double-layer co-extrusion blown film machine to be heated to 90 ℃, and then melted and stirred to form a foamed polyethylene melt;
s4: then adding EVA20kg and foaming agent sodium hydroxide 2.2kg into a double-layer co-extrusion blow molding film machine, melting at 90 ℃, and blow molding into a cylindrical two-layer inner mucosa, wherein the outer layer is an EVA film layer, and the inner layer is a foamed polyethylene film layer;
s5: a knitting procedure: weaving the coiled flat filaments into a cylindrical woven bag by a circular weaving machine, and sleeving a double-layer inner adhesive film in the cylindrical woven bag after inspection and qualification inspection, and then rolling by a rolling machine;
s6: a compounding procedure: the woven bag sleeved with the inner adhesive film passes through an inner adhesive film compounding machine, the EVA film layer is heated to the temperature of 100 ℃ through the compounding machine, the EVA film layer is heated and melted to have viscosity at the temperature, and sodium hydroxide of the EVA film layer is heated and decomposed to form a foaming EVA film layer so as to bond the foaming polyethylene film layer and the woven bag into a well-bonded inner adhesive film woven bag;
bag making: and (5) printing, cutting and sewing the inner adhesive film woven bag bonded in the step (S5) into a finished product plastic woven bag with the inner adhesive film.
Example 3
A method for manufacturing a high-permeability woven bag, which comprises a polypropylene woven bag, an EVA film layer and a polyethylene film layer from outside to inside in sequence, comprises the following steps:
s1: blending and drying raw materials: putting 100kg of polypropylene particles, 10kg of filling master batch and 20g of antioxidant into a drying stirrer, and stirring and drying;
s2: the wire drawing process comprises the following steps: feeding the material subjected to blending drying in the step S1 into an extruder, heating the material by a charging barrel and shearing a screw and a machine barrel, molding and extruding the material into a film by a die head, cooling the film by water at 30-40 ℃, cutting the film into blank wires by a blade, stretching the blank wires by a drying plate to form flat wires, and winding the flat wires into coils by a wire winding machine after the flat wires are subjected to heat setting;
s3: the foaming process comprises the following steps: 20kg of low-density polyethylene, 3.6kg of potato oxidized starch and 480g of AC foaming agent are added into a double-layer co-extrusion blown film machine to be heated to 85 ℃, melted and stirred to form a foamed polyethylene melt;
s4: then adding EVA20kg and foaming agent sodium hydroxide 3.5kg into a double-layer co-extrusion blow molding film machine, melting at 85 ℃, and blow molding into a cylindrical two-layer inner mucosa, wherein the outer layer is an EVA film layer, and the inner layer is a foamed polyethylene film layer;
s5: a knitting procedure: weaving the coiled flat filaments into a cylindrical woven bag by a circular weaving machine, and sleeving a double-layer inner adhesive film in the cylindrical woven bag after inspection and qualification inspection, and then rolling by a rolling machine;
s6: a compounding procedure: the woven bag sleeved with the inner adhesive film passes through an inner adhesive film compounding machine, the EVA film layer is heated to the temperature of 95 ℃ through the compounding machine, the EVA film layer is heated and melted to have viscosity at the temperature, sodium hydroxide of the EVA film layer is heated and decomposed to form a foaming EVA film layer, and the foaming EVA film layer and the woven bag are bonded into a well-bonded inner adhesive film woven bag;
bag making: and (5) printing, cutting and sewing the inner adhesive film woven bag bonded in the step (S5) into a finished product plastic woven bag with the inner adhesive film.
Comparative example 1
A method for manufacturing a high-permeability woven bag, which comprises a polypropylene woven bag, an EVA film layer and a polyethylene film layer from outside to inside in sequence, comprises the following steps:
s1: blending and drying raw materials: putting 100kg of polypropylene particles, 10kg of filling master batch and 20g of antioxidant into a drying stirrer, and stirring and drying;
s2: the wire drawing process comprises the following steps: feeding the material subjected to blending drying in the step S1 into an extruder, heating the material by a charging barrel and shearing a screw and a machine barrel, molding and extruding the material into a film by a die head, cooling the film by water at 30-40 ℃, cutting the film into blank wires by a blade, stretching the blank wires by a drying plate to form flat wires, and winding the flat wires into coils by a wire winding machine after the flat wires are subjected to heat setting;
s3: the foaming process comprises the following steps: 20kg of low-density polyethylene, 2kg of starch and 200g of AC foaming agent are added into a double-layer co-extrusion blown film machine to be heated to 90 ℃, and melted and stirred to form a foamed polyethylene melt;
s4: then adding EVA20kg and foaming agent sodium hydroxide 2.2kg into a double-layer co-extrusion blow molding film machine, melting at 90 ℃, and blow molding into a cylindrical two-layer inner mucosa, wherein the outer layer is an EVA film layer, the inner layer is a foamed polyethylene film layer, and observation shows that the film forming property of the inner layer foamed polyethylene film layer is poor, and more fracture parts exist in the film;
s5: a knitting procedure: weaving the coiled flat filaments into a cylindrical woven bag by a circular weaving machine, and sleeving a double-layer inner adhesive film in the cylindrical woven bag after inspection and qualification inspection, and then rolling by a rolling machine;
s6: a compounding procedure: the woven bag sleeved with the inner adhesive film passes through an inner adhesive film compounding machine, the EVA film layer is heated to the temperature of 100 ℃ through the compounding machine, the EVA film layer is heated and melted to have viscosity at the temperature, and sodium hydroxide of the EVA film layer is heated and decomposed to form a foaming EVA film layer so as to bond the foaming polyethylene film layer and the woven bag into a well-bonded inner adhesive film woven bag;
bag making: and (5) printing, cutting and sewing the inner adhesive film woven bag bonded in the step (S5) into a finished product plastic woven bag with the inner adhesive film.
Comparative example 2
A method for manufacturing a high-permeability woven bag, which comprises a polypropylene woven bag, an EVA film layer and a polyethylene film layer from outside to inside in sequence, comprises the following steps:
s1: blending and drying raw materials: putting 100kg of polypropylene particles, 10kg of filling master batch and 20g of antioxidant into a drying stirrer, and stirring and drying;
s2: the wire drawing process comprises the following steps: feeding the material subjected to blending drying in the step S1 into an extruder, heating the material by a charging barrel and shearing a screw and a machine barrel, molding and extruding the material into a film by a die head, cooling the film by water at 30-40 ℃, cutting the film into blank wires by a blade, stretching the blank wires by a drying plate to form flat wires, and winding the flat wires into coils by a wire winding machine after the flat wires are subjected to heat setting;
s3: the foaming process comprises the following steps: 20kg of low-density polyethylene, 0.5kg of starch and 200g of AC foaming agent are added into a double-layer co-extrusion blown film machine to be heated to 90 ℃, melted and stirred to form a foamed polyethylene melt;
s4: then adding EVA20kg and foaming agent sodium hydroxide 2.2kg into a double-layer co-extrusion blow molding film machine, melting at 90 ℃, and blow molding into a cylindrical two-layer inner mucosa, wherein the outer layer is an EVA film layer, and the inner layer is a foamed polyethylene film layer;
s5: a knitting procedure: weaving the coiled flat filaments into a cylindrical woven bag by a circular weaving machine, and sleeving a double-layer inner adhesive film in the cylindrical woven bag after inspection and qualification inspection, and then rolling by a rolling machine;
s6: a compounding procedure: the woven bag sleeved with the inner adhesive film passes through an inner adhesive film compounding machine, the EVA film layer is heated to the temperature of 100 ℃ through the compounding machine, the EVA film layer is heated and melted to have viscosity at the temperature, and sodium hydroxide of the EVA film layer is heated and decomposed to form a foaming EVA film layer so as to bond the foaming polyethylene film layer and the woven bag into a well-bonded inner adhesive film woven bag;
bag making: and (5) printing, cutting and sewing the inner adhesive film woven bag bonded in the step (S5) into a finished product plastic woven bag with the inner adhesive film.
The test specimens prepared from the woven bags of examples 1 to 3 were subjected to the test of air permeability and moisture permeability according to GB/T1038-2000 "differential pressure test method for Plastic film and sheet gas permeability test method" and GB1037-70 "test method for Plastic film gas permeability", respectively, and the results are shown in Table 1 below.
TABLE 1 air permeability and moisture permeability coefficients for the different examples
Examples 1, 2 and 3 are the test results of the air permeability and moisture permeability of the plastic woven bag by changing the amount of the potato oxidized starch in the formula of the inner mucosa, wherein the larger the air permeability coefficient is, the better the air permeability is, the larger the moisture permeability coefficient is, the poorer the water and water resistance is, it can be shown that in a certain range, the increase of the amount of the potato oxidized starch in the formula leads to the increase of the air permeability of the woven bag, but in example 3, the air permeability is better than that of example 2, the moisture permeability is increased along with the increase of the amount of the potato oxidized starch in a certain range, and in view of the comprehensive performance, example 2 is the best proportioning of the inner mucosa.
The difference between the comparative example 1 and the example 2 is that starch is used in the comparative example 1, potato oxidized starch is used in the example 2, the air permeability of the test woven bag in the comparative example 1 is poorer than that of the test woven bag in the example 2, and the water-resisting property is poorer than that of the test woven bag in the comparative example 1, because the oxidized starch is modified starch obtained by oxidizing starch under the action of an oxidizing agent in an acid, alkali and neutral medium, the oxidized starch is a product degraded by acid and alkali treatment, the molecular weight of the oxidized starch is smaller than that of the starch, the dosage of the oxidized starch in the film can be more than that of the starch, more fine pores are formed, the air permeability of the film is better, the hydroxyl in the starch is methylated to form hydroxymethyl, the acting force between the hydroxyl and water molecules is reduced, and the hydrophobic property of the polyethylene film is further increased.
Comparative example 1 is poor in film forming property, observation shows that the inner layer foamed polyethylene film layer is poor in film forming property, and more broken parts exist in the film, because starch is thicker than oxidized starch particles, film forming breakage is more under the condition of the same dosage, starch has more hydroxyl groups and is strong in hydrophilicity, the water-resisting property of the inner mucosa is poor compared with that of the inner mucosa of the woven bag using oxidized starch, and therefore the film forming property and the hydrophobic property of the inner mucosa using the same dosage can be improved by using the oxidized starch.
Comparative example 2 is a test woven bag obtained by reducing the amount of starch, and it can be seen from the data that although the woven bag has better water barrier properties than those of examples 1 and 3, the air permeability is greatly reduced, which does not satisfy the object of preparing the air permeable woven bag according to the present invention.
In view of the above considerations, the best mode of implementation is example 3.
The above description describes in detail the method for manufacturing a highly breathable woven bag according to the present invention. The principles and embodiments of the present invention are explained herein using specific examples, which are set forth only to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (3)
1. A manufacturing method of a high-permeability woven bag is characterized in that: the braided bag is by outer polypropylene braided bag, EVA thin layer and polyethylene thin layer of including in proper order to interior, includes following step:
s1: blending and drying raw materials: putting the polypropylene particles, the filling master batch and the auxiliary agent into a drying stirrer, and stirring and drying;
s2: the wire drawing process comprises the following steps: feeding the material subjected to blending drying in the step S1 into an extruder, heating the material by a charging barrel and shearing a screw and a machine barrel, molding and extruding the material into a film by a die head, cooling the film by water at 30-40 ℃, cutting the film into blank wires by a blade, stretching the blank wires by a drying plate to form flat wires, and winding the flat wires into coils by a wire winding machine after the flat wires are subjected to heat setting;
s3: the foaming process comprises the following steps: 75-90% of low-density polyethylene, 9-20% of potato oxidized starch and 1-5% of AC foaming agent are added into a double-layer co-extrusion blown film machine for heating, melting and stirring to form a foamed polyethylene melt;
s4: then adding 80-90% of EVA and 10-20% of foaming agent sodium bicarbonate into a double-layer co-extrusion blown film machine for heating, melting and then blowing to form two cylindrical inner mucosa layers, wherein the outer layer is an EVA film layer, and the inner layer is a foamed polyethylene film layer;
s5: a knitting procedure: weaving the coiled flat filaments into a cylindrical woven bag by a circular weaving machine, and sleeving a double-layer inner adhesive film in the cylindrical woven bag after inspection and qualification inspection, and then rolling by a rolling machine;
s6: a compounding procedure: the woven bag sleeved with the inner adhesive film is heated to 90-100 ℃ by an inner adhesive film compounding machine, the EVA film layer is heated and melted to have viscosity, the foaming agent of the EVA film layer is heated and decomposed to form a foaming EVA film layer, and the foaming EVA film layer and the woven bag are bonded into a well-bonded inner adhesive film woven bag;
s7: bag making: and (5) printing, cutting and sewing the inner adhesive film woven bag bonded in the step (S6) into a finished product plastic woven bag with the inner adhesive film.
2. The manufacturing method of the woven bag with high air permeability as claimed in claim 1, wherein: the heating temperature in the step S3 and the step S4 is 80-90 ℃.
3. The manufacturing method of the woven bag with high air permeability as claimed in claim 1, wherein: the raw material components for preparing the EVA film layer in the step S3 and the step S4 are EVA 85% and a foaming agent 15%, and the raw material components for preparing the polyethylene layer are foamed polyethylene 83%, potato oxidized starch 15% and an AC foaming agent 2%.
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| CN110406787A (en) * | 2019-07-08 | 2019-11-05 | 天津市久大塑料制品有限公司 | A kind of low smell, ventilating water proof woven bag and its manufacturing method |
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| CN105037915A (en) * | 2015-09-01 | 2015-11-11 | 徐州工业职业技术学院 | Preparation method of EVA foamed thin film |
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