CN108673982B - Manufacturing method of environment-friendly woven bag - Google Patents
Manufacturing method of environment-friendly woven bag Download PDFInfo
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- CN108673982B CN108673982B CN201810499124.7A CN201810499124A CN108673982B CN 108673982 B CN108673982 B CN 108673982B CN 201810499124 A CN201810499124 A CN 201810499124A CN 108673982 B CN108673982 B CN 108673982B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- 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
- B32B5/18—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 features of a layer of foamed material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- 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
- B32B5/22—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 the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
- B32B5/24—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 the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- 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
- B32B5/22—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 the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
- B32B5/32—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 the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed at least two layers being foamed and next to each other
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/02—Synthetic macromolecular fibres
- B32B2262/0253—Polyolefin fibres
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2266/00—Composition of foam
- B32B2266/02—Organic
- B32B2266/0214—Materials belonging to B32B27/00
- B32B2266/0221—Vinyl resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2266/00—Composition of foam
- B32B2266/02—Organic
- B32B2266/0214—Materials belonging to B32B27/00
- B32B2266/025—Polyolefin
Landscapes
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Laminated Bodies (AREA)
- Wrappers (AREA)
Abstract
The invention provides a method for manufacturing an environment-friendly 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; 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 woven bag which is used for containing living things such as fruits, seeds, saplings and the like and has good air permeability and good waterproof effect.
Description
Technical Field
The invention relates to the technical field of plastic woven bag processing, in particular to a manufacturing method of an environment-friendly 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 breathable water-proof woven bag for containing living things such as fruits, seeds, saplings and the like, which has good air permeability and water-proof effect.
The invention provides a method for manufacturing an environment-friendly 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 wheat 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%, wheat oxidized starch 15% and an AC foaming agent 2%.
Compared with the prior art, the invention has the following beneficial effects:
1. the inner film layer is formed by heating, melting and blow-molding foamed polyethylene, wheat oxidized starch and a dispersing agent, wherein the foamed polyethylene film layer added with the wheat oxidized starch has numerous fine pores, and the peripheries of wheat oxidized starch particles can form more communicated fine pores or channels, and a net structure is formed between the fine pores and the channels and the pores in the foamed polyethylene, so that the whole polyethylene film layer has excellent gas permeability, the substance with a large compression coefficient, namely gas, can be rapidly diffused through the polyethylene film layer, the diameter of the substance is smaller than that of the pores of the film, and water drops can be effectively prevented from passing through the pores, therefore, the inner polyethylene film layer can play a role of ventilation and moisture prevention, and fruits, seeds and the like can be contained for a long time, The oxygen circulation supply of the needed living things such as saplings is kept, the living 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 wheat 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 dosage of the oxidized starch in the film can be more compared with that of the starch, the formed fine pores are more, the air permeability of the film is better, the hydroxymethyl 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, wherein the wheat oxidized starch has better solid dispersibility than potato oxidized starch, the transparency of the wheat starch is high, the wheat oxidized starch is easy to decompose by enzyme, and the environmental protection property of a woven bag can be 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 an environment-friendly woven bag, which comprises the following specific implementation modes.
Example 1
The manufacturing method of the environment-friendly woven bag comprises the following steps of:
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: adding 20kg of low-density polyethylene, 5.3kg of wheat oxidized starch and 1.3kg of AC foaming agent into a double-layer co-extrusion blown film machine, heating to 80 ℃, and melting and stirring 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
The manufacturing method of the environment-friendly woven bag comprises the following steps of:
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: adding 20kg of low-density polyethylene, 2kg of wheat oxidized starch and 200g of AC foaming agent into a double-layer co-extrusion blown film machine, heating to 90 ℃, and melting and stirring 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
The manufacturing method of the environment-friendly woven bag comprises the following steps of:
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 wheat 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 20kg of EVA% and 3.5kg of sodium hydroxide serving as a foaming agent into a double-layer co-extrusion blow molding film machine, melting at the temperature of 85 ℃, and then blowing 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
The manufacturing method of the environment-friendly woven bag comprises the following steps of:
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
The manufacturing method of the environment-friendly woven bag comprises the following steps of:
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 test results of air permeability and moisture permeability of plastic woven bags by changing the amount of the oxidized wheat 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 oxidized wheat starch in the formula tends to increase the air permeability of the woven bags, but example 3 is better than example 2 in air permeability, the moisture permeability increases with the increase of the amount of the oxidized wheat starch in a certain range, and example 2 is the best ratio of the inner mucosa in view of comprehensive performance.
The difference between the comparative example 1 and the example 2 is that the comparative example 1 uses starch, the example 2 uses wheat oxidized starch, the test woven bag of the comparative example 1 has poorer air permeability and poorer water-resisting performance than the test woven bag of the example 2, because the oxidized starch is modified starch obtained by oxidizing the starch in acid, alkali and neutral media and reacting the starch with an oxidizing agent, the oxidized starch is a product degraded by acid and alkali treatment, has smaller molecular weight than the starch, can be used in a film in more amount compared with the starch, forms more fine pores and has better air permeability, the hydroxyl groups in the starch are methylated to form hydroxymethyl groups, the acting force between the hydroxyl groups and water molecules is reduced, and the hydrophobic performance of the polyethylene film is further improved.
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 method for manufacturing the environment-friendly woven bag provided by the invention is described in detail above. 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 (4)
1. The manufacturing method of the environment-friendly 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 wheat 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 heating temperature is 90-100 ℃, 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 is bonded with the woven bag to form a 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 environment-friendly woven bag according to claim 1, characterized in that: the heating temperature in the step S3 and the step S4 is 80-90 ℃.
3. The manufacturing method of the environment-friendly woven bag according to claim 1, characterized in that: the foaming agent is sodium bicarbonate.
4. The manufacturing method of the environment-friendly woven bag according to claim 1, characterized in that: 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%, wheat oxidized starch 15% and an AC foaming agent 2%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810499124.7A CN108673982B (en) | 2018-05-23 | 2018-05-23 | Manufacturing method of environment-friendly woven bag |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810499124.7A CN108673982B (en) | 2018-05-23 | 2018-05-23 | Manufacturing method of environment-friendly woven bag |
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| CN102504344A (en) * | 2011-11-09 | 2012-06-20 | 青岛科技大学 | Recyclable high-strength biological packaging material |
| CN104477490A (en) * | 2014-11-29 | 2015-04-01 | 安徽顺彤包装材料有限公司 | Production process of plastic woven bag |
| CN105109803A (en) * | 2015-07-16 | 2015-12-02 | 广西鹿寨桂浙塑料包装有限公司 | Method for manufacturing interior film-pasting woven bag |
| CN105566831A (en) * | 2016-03-07 | 2016-05-11 | 惠州市环美盛新材料有限公司 | Water-foamed, antibacterial and air-permeable microporous film masterbatch, film and preparation method thereof |
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| CN102504344A (en) * | 2011-11-09 | 2012-06-20 | 青岛科技大学 | Recyclable high-strength biological packaging material |
| CN104477490A (en) * | 2014-11-29 | 2015-04-01 | 安徽顺彤包装材料有限公司 | Production process of plastic woven bag |
| CN105109803A (en) * | 2015-07-16 | 2015-12-02 | 广西鹿寨桂浙塑料包装有限公司 | Method for manufacturing interior film-pasting woven bag |
| CN105566831A (en) * | 2016-03-07 | 2016-05-11 | 惠州市环美盛新材料有限公司 | Water-foamed, antibacterial and air-permeable microporous film masterbatch, film and preparation method thereof |
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