CN108715055A - A kind of manufacturing method of high ventilative woven bag - Google Patents
A kind of manufacturing method of high ventilative woven bag Download PDFInfo
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- CN108715055A CN108715055A CN201810499118.1A CN201810499118A CN108715055A CN 108715055 A CN108715055 A CN 108715055A CN 201810499118 A CN201810499118 A CN 201810499118A CN 108715055 A CN108715055 A CN 108715055A
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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
- 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
- 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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- 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
-
- 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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- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
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Abstract
The present invention provides a kind of manufacturing method of high ventilative woven bag, and woven bag includes successively from outside to inside polypropylene woven bag, eva film layer and film layer, is included the following steps：S1：Drying is blended in raw material；S2：Drawing process；S3：Foam process；S4：EVA80%-90%, foaming agent 10%-20% are added after heating in double-layer coextrusion inflation film machine, melting again and are blow molded into mucous membrane in columnar two layers, wherein outer layer is eva film layer, and internal layer is polyethylene foamed film layer；S5：Knitting process；S6：Compound working procedure；S7：Bag making.The manufacturing method for good, good water insulation effect the ventilative woven bag of height of permeability that the purpose of the present invention is to provide a kind of for containing the beings such as fruit, seed, sapling.
Description
Technical field
The present invention relates to Polywoven Bag processing technique field, more particularly to a kind of manufacturing method of high ventilative woven bag.
Background technology
Polywoven Bag is formed by extrusion, wire drawing, then through weaving, braiding, bag making using polypropylene as primary raw material.
Polywoven Bag, which is often used in, contains the object that flour, seed, sugar, fruits and vegetables, sapling, fertilizer, chemical reagent etc. cannot make moist
Matter, so polybag is needed to have one layer of waterproof and dampproof interior mucous membrane.Currently, woven bag of China's mass production containing interior mucous membrane is will to compile
Plastic outer bag made of knitting and single layer inner lining film bag are using being manually set in together, low production efficiency, high labor cost, and
Inner lining film is waterproof and dampproof polyethylene film, but existing polyethylene film is also prevented from air stream while waterproof and dampproof
It is logical, when contained in Polywoven Bag be fruit, seed, sapling etc. need the being of oxygen often because no oxygen circulation and
Corruption, death cause economic loss, it is therefore desirable to a kind of moisture-proof ventilative interior viscid film plastic woven bag and its manufacturing method are researched and developed,
To contain the beings such as fruit, seed, sapling.
Invention content
The purpose of the present invention is to provide it is a kind of for contain the beings such as fruit, seed, sapling permeability is good, water proof
The manufacturing method of the ventilative woven bag woven bag of the good height of effect.
The present invention provides a kind of manufacturing method of high ventilative woven bag, and interior mucous membrane woven bag includes poly- third successively from outside to inside
Alkene woven bag, eva film layer and film layer, include the following steps：
S1：Drying is blended in raw material：PP GRANULES, filling master batch, auxiliary agent are put into dry blender and stir drying；
S2：Drawing process：Material after the blending of S1 steps is dry enters extruder, the heating by barrel and spiral shell
The shearing of bar and machine barrel is extruded as film by die head molding, after 30-40 DEG C of water cooling, embryo silk is cut into blade,
And be stretched to form flat filament by drying-plate, it is coiled that flat filament receives silk after thermal finalization by receive silk machine；
S3：Foam process：Low density polyethylene (LDPE) 75%-90%, potato oxidized starch 9%-20%, AC foaming agent 1%-
5% is added heating in double-layer coextrusion inflation film machine, melting stirring, forms polyethylene foamed melt；
S4：Heating in double-layer coextrusion inflation film machine, melting is added in EVA80%-90%, foaming agent 10%-20% again
After be blow molded into mucous membrane in columnar two layers, wherein outer layer is eva film layer, and internal layer is polyethylene foamed film layer；
S5：Knitting process：By coiled flat filament by circular weaving machine at cylindrical shape woven bag, by examining, it is qualified to examine
Afterwards, mucous membrane in bilayer is sleeved in cylindrical shape woven bag, then is wound by winder；
S6：Compound working procedure：The woven bag for being cased with interior mucous membrane passes through interior mucous membrane compounding machine, and eva film layer passes through melted by heating
With viscosity, the foaming agent of eva film layer is thermally decomposed, and forms foaming eva film layer by polyethylene foamed film layer and braiding
Bag is bonded to the interior mucous membrane woven bag bonded；
S7：Bag making：The interior mucous membrane woven bag bonded in step S5 is carried by printing, cutting and sew as finished product
Interior viscid film plastic woven bag.
As a further improvement on the present invention, heating temperature is 80 DEG C -90 DEG C in step S3.
As a further improvement on the present invention, the heating temperature in step S6 is 90 DEG C -100 DEG C.
As a further improvement on the present invention, foaming agent is sodium bicarbonate.
As a further improvement on the present invention, the raw material components that eva film layer is prepared in step S3 are EVA85%, foam
Agent 15%, the raw material components for preparing polyethylene layer are polyethylene foamed 83%, potato oxidized starch 15%, AC foaming agents 2%.
Compared with prior art, the invention has the advantages that：
1. the interior mucous membrane of the present invention is made of film layer and eva film layer, inner layer polyethylene film layer is to use
Polyethylene foamed, potato oxidized starch and dispersant are blow molded after heating, melting, and are added to potato oxidized starch
Polyethylene foamed film layer in have a numerous Small Holes gap, and potato oxidized starch particle periphery can it is formed more mutually
The tiny hole of connection or channel form reticular structure between the hole in tiny hole and channel and polyethylene foamed, make
Obtaining entire film layer has excellent gas penetration performance, and it is fast to be conducive to the larger substance of this compressed coefficient of gas
Speed diffuses through film layer, and the diameter better than the hole of film is smaller, can effectively stop that droplet passes through hole, therefore interior
Strata vinyl film can play the effect of air-permeable dampproof, and the being that the needs such as fruit, seed, sapling are contained in long-time is kept
Oxygen circulation supply, extends the time-to-live of being, reduces loss.
2. the polarity due to polyethylene is very weak, it is therefore desirable to which eva film layer is by film layer and polypropylene woven bag
Fastening is bonded, eva film layer of the invention is using EVA and foaming agent by heating, when melting, and foaming agent does not decompose generation gas
Body, foaming agent are dispersed in eva film layer, when eva film layer enters the heating of interior mucous membrane compounding machine, EVA melted by heating, but
The melting temperature that temperature is not up to polyethylene, then EVA is by inner layer polyethylene film layer and polypropylene woven bag tight bond,
Foaming agent in eva film layer is thermally decomposed, and is generated bulk gas, is formed the hole being largely relatively large in diameter in eva film layer, both
The cementation of EVA can be played can enable extraneous gas to run through eva film again.
3. the polyethylene film of the present invention is using potato oxidized starch, oxidized starch is starch in acid, alkali, neutrality
It is acted on oxidant in medium, it is to handle to degrade by soda acid to make a kind of converted starch obtained from starch oxidation, oxidized starch
Product afterwards, molecular weight, can be more compared to the dosage for starch in the film than starch smaller, the Small Holes of formation
Gap is more, and the gas permeability of film is more preferable, is that the hydroxymethylation in starch is formed methylol, reduces between hydroxyl and hydrone
Active force, further increase the hydrophobic performance of polyethylene film.
Specific implementation mode
Technical scheme of the present invention is clearly and completely described below in conjunction with specific embodiment.Obviously, described
Embodiment be only the present invention a part of the embodiment, instead of all the embodiments.Based on the embodiment of the present invention, ability
The every other embodiment that domain those of ordinary skill is obtained without creative efforts, belongs to guarantor of the present invention
The range of shield.
The present invention discloses a kind of manufacturing method of high ventilative woven bag, specific implementation mode is as follows.
Embodiment 1
A kind of manufacturing method of high ventilative woven bag, woven bag include polypropylene woven bag, eva film successively from outside to inside
Layer and film layer, include the following steps：
S1：Drying is blended in raw material：100kg PP GRANULESs, 10kg filling master batch, 20g antioxidants are put into drying
Drying is stirred in blender；
S2：Drawing process：Material after the blending of S1 steps is dry enters extruder, the heating by barrel and spiral shell
The shearing of bar and machine barrel is extruded as film by die head molding, after 30-40 DEG C of water cooling, embryo silk is cut into blade,
And be stretched to form flat filament by drying-plate, it is coiled that flat filament receives silk after thermal finalization by receive silk machine；
S3：Foam process：Low density polyethylene (LDPE) 20kg, potato oxidized starch 5.3kg, AC foaming agent 1.3kg are added double
It is heated to 80 DEG C, melting stirring in layer coextrusion blow film machine, forms polyethylene foamed melt；
S4：EVA20kg, foaming agent sodium hydroxide 5kg are added in double-layer coextrusion inflation film machine at a temperature of 80 DEG C again and melted
Mucous membrane in columnar two layers is blow molded into after melting, wherein outer layer is eva film layer, and internal layer is polyethylene foamed film layer；
S5：Knitting process：By coiled flat filament by circular weaving machine at cylindrical shape woven bag, by examining, it is qualified to examine
Afterwards, mucous membrane in bilayer is sleeved in cylindrical shape woven bag, then is wound by winder；
S6：Compound working procedure：The woven bag for being cased with interior mucous membrane passes through interior mucous membrane compounding machine, and eva film layer adds by compounding machine
Heat to temperature is 90 DEG C, and eva film layer melted by heating has viscosity, heated point of the sodium hydroxide of eva film layer at this temperature
Solution forms foaming eva film layer and polyethylene foamed film layer and woven bag is bonded to the interior mucous membrane woven bag bonded；
S6：Bag making：The interior mucous membrane woven bag bonded in step S5 is carried by printing, cutting and sew as finished product
Interior viscid film plastic woven bag.
Embodiment 2
A kind of manufacturing method of high ventilative woven bag, woven bag include polypropylene woven bag, eva film successively from outside to inside
Layer and film layer, include the following steps：
S1：Drying is blended in raw material：100kg PP GRANULESs, 10kg filling master batch, 20g antioxidants are put into drying
Drying is stirred in blender；
S2：Drawing process：Material after the blending of S1 steps is dry enters extruder, the heating by barrel and spiral shell
The shearing of bar and machine barrel is extruded as film by die head molding, after 30-40 DEG C of water cooling, embryo silk is cut into blade,
And be stretched to form flat filament by drying-plate, it is coiled that flat filament receives silk after thermal finalization by receive silk machine；
S3：Foam process：Low density polyethylene (LDPE) 20kg, potato oxidized starch 2kg, AC foaming agent 200g are added double-deck total
It squeezes in inflation film machine and is heated to 90 DEG C, melting stirring, form polyethylene foamed melt；
S4：EVA20kg, foaming agent sodium hydroxide 2.2kg are added in double-layer coextrusion inflation film machine at a temperature of 90 DEG C again
Mucous membrane in columnar two layers is blow molded into after melting, wherein outer layer is eva film layer, and internal layer is polyethylene foamed film layer；
S5：Knitting process：By coiled flat filament by circular weaving machine at cylindrical shape woven bag, by examining, it is qualified to examine
Afterwards, mucous membrane in bilayer is sleeved in cylindrical shape woven bag, then is wound by winder；
S6：Compound working procedure：The woven bag for being cased with interior mucous membrane passes through interior mucous membrane compounding machine, and eva film layer adds by compounding machine
Heat to temperature is 100 DEG C, and at this temperature, eva film layer has viscosity, the sodium hydroxide of eva film layer by melted by heating
It is thermally decomposed, forms foaming eva film layer and polyethylene foamed film layer and woven bag are bonded to the interior mucous membrane braiding bonded
Bag；
Bag making：The interior mucous membrane woven bag bonded in step S5 is become into finished product with interior by printing, cutting and sew
Viscid film plastic woven bag.
Embodiment 3
A kind of manufacturing method of high ventilative woven bag, woven bag include polypropylene woven bag, eva film successively from outside to inside
Layer and film layer, include the following steps：
S1：Drying is blended in raw material：100kg PP GRANULESs, 10kg filling master batch, 20g antioxidants are put into drying
Drying is stirred in blender；
S2：Drawing process：Material after the blending of S1 steps is dry enters extruder, the heating by barrel and spiral shell
The shearing of bar and machine barrel is extruded as film by die head molding, after 30-40 DEG C of water cooling, embryo silk is cut into blade,
And be stretched to form flat filament by drying-plate, it is coiled that flat filament receives silk after thermal finalization by receive silk machine；
S3：Foam process：Low density polyethylene (LDPE) 20kg, potato oxidized starch 3.6kg, AC foaming agent 480g are added double-deck
It is heated to 85 DEG C, melting stirring in coextrusion blow film machine, forms polyethylene foamed melt；
S4：EVA20kg, foaming agent sodium hydroxide 3.5kg are added in double-layer coextrusion inflation film machine at a temperature of 85 DEG C again
Mucous membrane in columnar two layers is blow molded into after melting, wherein outer layer is eva film layer, and internal layer is polyethylene foamed film layer；
S5：Knitting process：By coiled flat filament by circular weaving machine at cylindrical shape woven bag, by examining, it is qualified to examine
Afterwards, mucous membrane in bilayer is sleeved in cylindrical shape woven bag, then is wound by winder；
S6：Compound working procedure：The woven bag for being cased with interior mucous membrane passes through interior mucous membrane compounding machine, and eva film layer adds by compounding machine
Heat to temperature is 95 DEG C, and eva film layer melted by heating has viscosity, heated point of the sodium hydroxide of eva film layer at this temperature
Solution, it forms foaming eva film layer and polyethylene foamed film layer and woven bag is bonded to the interior mucous membrane woven bag bonded；
Bag making：The interior mucous membrane woven bag bonded in step S5 is become into finished product with interior by printing, cutting and sew
Viscid film plastic woven bag.
Comparative example 1
A kind of manufacturing method of high ventilative woven bag, woven bag include polypropylene woven bag, eva film successively from outside to inside
Layer and film layer, include the following steps：
S1：Drying is blended in raw material：100kg PP GRANULESs, 10kg filling master batch, 20g antioxidants are put into drying
Drying is stirred in blender；
S2：Drawing process：Material after the blending of S1 steps is dry enters extruder, the heating by barrel and spiral shell
The shearing of bar and machine barrel is extruded as film by die head molding, after 30-40 DEG C of water cooling, embryo silk is cut into blade,
And be stretched to form flat filament by drying-plate, it is coiled that flat filament receives silk after thermal finalization by receive silk machine；
S3：Foam process：Double-layer coextrusion inflation film is added in low density polyethylene (LDPE) 20kg, starch 2kg, AC foaming agent 200g
It is heated to 90 DEG C, melting stirring in machine, forms polyethylene foamed melt；
S4：EVA20kg, foaming agent sodium hydroxide 2.2kg are added in double-layer coextrusion inflation film machine at a temperature of 90 DEG C again
Mucous membrane in columnar two layers is blow molded into after melting, wherein outer layer is eva film layer, and internal layer is polyethylene foamed film layer, is seen
It examines and finds that internal layer polyethylene foamed film layer film forming is poor, there are more breaking parts in film；
S5：Knitting process：By coiled flat filament by circular weaving machine at cylindrical shape woven bag, by examining, it is qualified to examine
Afterwards, mucous membrane in bilayer is sleeved in cylindrical shape woven bag, then is wound by winder；
S6：Compound working procedure：The woven bag for being cased with interior mucous membrane passes through interior mucous membrane compounding machine, and eva film layer adds by compounding machine
Heat to temperature is 100 DEG C, and at this temperature, eva film layer has viscosity, the sodium hydroxide of eva film layer by melted by heating
It is thermally decomposed, forms foaming eva film layer and polyethylene foamed film layer and woven bag are bonded to the interior mucous membrane braiding bonded
Bag；
Bag making：The interior mucous membrane woven bag bonded in step S5 is become into finished product with interior by printing, cutting and sew
Viscid film plastic woven bag.
Comparative example 2
A kind of manufacturing method of high ventilative woven bag, woven bag include polypropylene woven bag, eva film successively from outside to inside
Layer and film layer, include the following steps：
S1：Drying is blended in raw material：100kg PP GRANULESs, 10kg filling master batch, 20g antioxidants are put into drying
Drying is stirred in blender；
S2：Drawing process：Material after the blending of S1 steps is dry enters extruder, the heating by barrel and spiral shell
The shearing of bar and machine barrel is extruded as film by die head molding, after 30-40 DEG C of water cooling, embryo silk is cut into blade,
And be stretched to form flat filament by drying-plate, it is coiled that flat filament receives silk after thermal finalization by receive silk machine；
S3：Foam process：It is thin that double-layer coextrusion blowing is added in low density polyethylene (LDPE) 20kg, starch 0.5kg, AC foaming agent 200g
It is heated to 90 DEG C, melting stirring in film machine, forms polyethylene foamed melt；
S4：EVA20kg, foaming agent sodium hydroxide 2.2kg are added in double-layer coextrusion inflation film machine at a temperature of 90 DEG C again
Mucous membrane in columnar two layers is blow molded into after melting, wherein outer layer is eva film layer, and internal layer is polyethylene foamed film layer；
S5：Knitting process：By coiled flat filament by circular weaving machine at cylindrical shape woven bag, by examining, it is qualified to examine
Afterwards, mucous membrane in bilayer is sleeved in cylindrical shape woven bag, then is wound by winder；
S6：Compound working procedure：The woven bag for being cased with interior mucous membrane passes through interior mucous membrane compounding machine, and eva film layer adds by compounding machine
Heat to temperature is 100 DEG C, and at this temperature, eva film layer has viscosity, the sodium hydroxide of eva film layer by melted by heating
It is thermally decomposed, forms foaming eva film layer and polyethylene foamed film layer and woven bag are bonded to the interior mucous membrane braiding bonded
Bag；
Bag making：The interior mucous membrane woven bag bonded in step S5 is become into finished product with interior by printing, cutting and sew
Viscid film plastic woven bag.
Prepared by test bars respectively according to GB/T1038-2000 to woven bag in embodiment 1- embodiments 3《Plastic film and
Thin slice gas-premeable test method pressure differential method》And GB1037-70《Plastic film permeability test method》Carry out permeability
With the test of water vapour permeability, as a result such as the following table 1.
The air transmission coefficient and moisture permeable coefficient of the different embodiments of table 1
Embodiment 1, embodiment 2 and embodiment 3 change potato oxidized starch dosage in interior mucous membrane formula and are presented
The test result of Polywoven Bag permeability and water vapour permeability, wherein the bigger permeability of air transmission coefficient is better, moisture permeable coefficient
Bigger, the water isolating that blocks water is poorer, it can be deduced that, in a certain range, the increasing of potato oxidized starch dosage dosage in formula
Add, the permeability of woven bag is at increase tendency, but embodiment 3 is more preferable than the permeability of embodiment 2, and water vapour permeability is one
Determine to increase with the increase of middle potato oxidized starch dosage dosage in range, embodiment 2 is interior viscous from comprehensive performance
The optimum proportioning of film.
From comparative example 1 the difference from example 2 is that comparative example 1 uses starch, and uses horse in embodiment 2
Bell potato oxidized starch, comparative example 1 test woven bag than embodiment 2 test woven bag permeability it is poor, and compared to every
It is aqueous can be worse, this is because oxidized starch be starch in acid, alkali, neutral medium with oxidant effect, make starch oxidation and
A kind of obtained converted starch, oxidized starch are the products after soda acid processing degradation, and molecular weight is compared than starch smaller
Dosage for starch in the film can be more, and the tiny hole of formation is more, and the gas permeability of film is more preferable, are by starch
In hydroxymethylation form methylol, reduce the active force between hydroxyl and hydrone, further increase dredging for polyethylene film
Aqueous energy.
1 film forming of comparative example is poor, and observation finds that internal layer polyethylene foamed film layer film forming is poor, exists in film more multibreak
Place is split, because starch is coarseer than oxidized starch particle, film forming fracture is more in the case of same dosage, and starch is with more
Hydroxyl, hydrophily is strong, then in mucous membrane water isolating it is poor compared with the water-resisting property of mucous membrane in the woven bag for using oxidized starch, therefore
The filming performance and hydrophobic performance of mucous membrane in same dosage can be improved using oxidized starch.
Comparative example 2 be reduce the obtained test woven bag of starch dosage, although from data as can be seen that woven bag every
Water performance ratio embodiment 1 and embodiment 3 are good, but its permeability greatly reduces, and are unsatisfactory for the present invention and prepare woven bag of breathing freely
Purpose.
In summary factor considers that best embodiment is embodiment 3.
A kind of manufacturing method of high ventilative woven bag provided by the present invention is described in detail above.It answers herein
With specific embodiment, principle and implementation of the present invention are described, and the explanation of above example is only intended to help
Understand the method and its core concept of the present invention.It should be pointed out that for those skilled in the art, not taking off
, can be with several improvements and modifications are made to the present invention under the premise of from the principle of the invention, these improvement and modification also fall into this
In invention scope of the claims.
Claims (5)
1. a kind of manufacturing method of high ventilative woven bag, it is characterised in that：Woven bag includes polypropylene woven successively from outside to inside
Bag, eva film layer and film layer, include the following steps：
S1：Drying is blended in raw material：PP GRANULES, filling master batch, auxiliary agent are put into dry blender and stir drying；
S2：Drawing process：Material after the blending of S1 steps is dry enters extruder, by the heating of barrel and screw rod with
The shearing of machine barrel is extruded as film by die head molding, after 30-40 DEG C of water cooling, cuts into embryo silk with blade, and pass through
It crosses drying-plate to be stretched to form flat filament, it is coiled that flat filament receives silk after thermal finalization by receive silk machine；
S3：Foam process：Low density polyethylene (LDPE) 75%-90%, potato oxidized starch 9%-20%, AC foaming agent 1%-5%
Heating in double-layer coextrusion inflation film machine, melting stirring is added, forms polyethylene foamed melt；
S4：Heating in double-layer coextrusion inflation film machine, melting after-blow is added in EVA80%-90%, foaming agent 10%-20% again
It is moulded into mucous membrane in columnar two layers, wherein outer layer is eva film layer, and internal layer is polyethylene foamed film layer；
S5：Knitting process：It, after the assay was approved, will by examining by coiled flat filament by circular weaving machine at cylindrical shape woven bag
Mucous membrane is sleeved in cylindrical shape woven bag in bilayer, then is wound by winder；
S6：Compound working procedure：The woven bag for being cased with interior mucous membrane passes through interior mucous membrane compounding machine, and eva film layer has by melted by heating
The foaming agent of viscosity, eva film layer is thermally decomposed, and is formed foaming eva film layer and is glued polyethylene foamed film layer and woven bag
Form the interior mucous membrane woven bag bonded；
S7：Bag making：The interior mucous membrane woven bag bonded in step S6 is become into finished product with interior viscous by printing, cutting and sew
Film Polywoven Bag.
2. a kind of manufacturing method of high ventilative woven bag according to claim 1, it is characterised in that：The step S3 and step
Heating temperature is 80 DEG C -90 DEG C in rapid S4.
3. a kind of manufacturing method of high ventilative woven bag according to claim 1, it is characterised in that：In the step S6
Heating temperature is 90 DEG C -100 DEG C.
4. a kind of manufacturing method of high ventilative woven bag according to claim 1, it is characterised in that：The foaming agent is carbon
Sour hydrogen sodium.
5. a kind of manufacturing method of high ventilative woven bag according to claim 1, it is characterised in that：The step S3 and step
The raw material components that eva film layer is prepared in rapid S4 are EVA85%, foaming agent 15%, and the raw material components for preparing polyethylene layer are hair
Steep polyethylene 83%, potato oxidized starch 15%, AC foaming agents 2%.
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