CN109080102B - Wire drawing process of plastic woven bag - Google Patents
Wire drawing process of plastic woven bag Download PDFInfo
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- CN109080102B CN109080102B CN201811059540.1A CN201811059540A CN109080102B CN 109080102 B CN109080102 B CN 109080102B CN 201811059540 A CN201811059540 A CN 201811059540A CN 109080102 B CN109080102 B CN 109080102B
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Abstract
The invention discloses a wire drawing process of a plastic woven bag, which comprises the following specific operation steps: the method comprises the following steps: preparing raw materials: pouring polypropylene powder, various additives and activated calcium carbonate into a high-speed mixer according to a proper component proportion in sequence, fully stirring from low speed to high speed, conveying the mixture into a smelting furnace through a feeding screw, and melting and plasticizing the fully mixed raw materials; step two: extruding to form a film: and (3) conveying the molten material in the step one to a double-stage extrusion unit through a feeding screw rod, extruding the molten material in a quantitative and constant pressure manner, and extruding and molding the molten material through a die head to form a molten film. The invention can greatly improve the toughness of the finished plastic wire by accurately controlling the temperature in the wire drawing process, and can ensure that the plastic film is cooled more uniformly by adopting flowing cooling water to cool the plastic film, thereby reducing the formation of wrinkles on the surface of the plastic film.
Description
Technical Field
The invention relates to the field of plastic woven bags, in particular to a wire drawing process of a plastic woven bag.
Background
As is well known, the key process of the plastic woven bag production line is wire drawing, and the quality of the wire drawing process directly influences the quality of the plastic woven bag. The plastic woven bag manufactured by the plastic wires produced by the existing wire drawing process is easy to break in the using process, and the surface of the plastic wires is easy to form wrinkles, so that the hand feeling is not comfortable.
Therefore, it is necessary to invent a drawing process for woven plastic bags to solve the above problems.
Disclosure of Invention
The invention aims to provide a wire drawing process of a plastic woven bag, which can greatly improve the toughness of finished plastic wires by accurately controlling the temperature in the wire drawing process, can ensure that the plastic film is cooled more uniformly by adopting flowing cooling water, reduces the formation of wrinkles on the surface of the plastic film, and can greatly enhance the use hand feeling of the plastic wires by uniformly coating the surface of the plastic wires so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a wire drawing process for a plastic woven bag comprises the following specific operation steps:
the method comprises the following steps: preparing raw materials: pouring polypropylene powder, various additives and activated calcium carbonate into a high-speed mixer according to a proper component proportion in sequence, fully stirring from low speed to high speed, conveying the mixture into a smelting furnace through a feeding screw, and melting and plasticizing the fully mixed raw materials;
step two: extruding to form a film: conveying the molten material in the step one to a double-stage extrusion unit through a feeding screw rod, extruding the molten material in a quantitative and constant pressure manner, and extruding and molding the molten material through a die head to form a molten film;
step three: and (3) cooling: feeding the molten film in the step two into cooling water or a cold air chamber for cooling treatment;
step four: cutting: cutting the cooled plastic film into blank wires with equal width by a blade;
step five: heating and stretching: placing the embryonic filaments in the fourth step in an oven with higher temperature to be stretched in a high power mode until the embryonic filaments are stretched to form flat filaments;
step six: heat setting: placing the flat filaments formed by stretching in the step five on a hot-pressing roller for heat setting, then shrinking the flat filaments at a low traction speed, and performing low-temperature treatment on a cold-pressing roller;
step seven: and (3) static elimination: continuously subjecting the plastic filaments subjected to heat setting in the sixth step to static electricity removing treatment through a plurality of groups of compression roller assemblies consisting of two static electricity removing rods so as to remove static electricity on the surfaces of the plastic filaments;
step eight: coating: uniformly coating molten resin on the surface of the plastic wire subjected to the static electricity removal treatment in the step seven and immediately cooling to form a braided wire directly used for braiding;
step nine: rolling and forming: and (5) winding the braided wire which is coated with the film and cooled in the step eight.
Preferably, the melting temperature of the mixture in the first step is 200-250 ℃.
Preferably, the two-stage extruder set in the second step is formed by combining a parallel co-rotating twin-screw extruder with a screw diameter of 65mm and a single-screw extruder with a screw diameter of 150 mm.
Preferably, the extrusion molding temperature in the second step is 180-200 ℃.
Preferably, the cooling water in the third step is selected from flowing cooling water, the cooling temperature is controlled at 30-60 ℃, and the cooling time is 30-45 min.
Preferably, the temperature in the oven in the step five is 150-180 ℃.
Preferably, the heat setting temperature of the hot pressing roller in the sixth step is 100-150 ℃, the cooling temperature of the cold pressing roller is 30-50 ℃, and the time of the cooling treatment is 1.5 h.
Preferably, in the ninth step, a magnetic disk differential tension winding mechanism is used for winding the knitting yarn.
The invention has the technical effects and advantages that:
1. according to the invention, the temperature in the wire drawing process is accurately controlled, so that the toughness of the finished plastic wire can be greatly improved, the plastic film is cooled by adopting flowing cooling water, the plastic film can be cooled more uniformly, the formation of wrinkles on the surface of the plastic film is reduced, and meanwhile, the hand feeling of the finished plastic wire is enhanced by adopting a mode of uniformly coating resin on the surface of the plastic wire, so that the discomfort of hand feeling of a user is avoided;
2. the invention utilizes a double-stage extruder set formed by combining a parallel co-rotating double-screw extruder with a screw diameter of 65mm and a single-screw extruder with a screw diameter of 150mm to extrude the plastic film, and can better control the quality of plastic film extrusion molding.
Drawings
FIG. 1 is a flow chart of the spinning process of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
the invention provides a drawing process of a plastic woven bag as shown in figure 1, which comprises the following specific operation steps:
the method comprises the following steps: preparing raw materials: pouring polypropylene powder, various additives and activated calcium carbonate into a high-speed mixer according to a proper component proportion in sequence, fully stirring from low speed to high speed, conveying the mixture into a smelting furnace with the heating temperature of 200 ℃ through a feeding screw, and melting and plasticizing the fully mixed raw materials;
step two: extruding to form a film: conveying the molten material in the step one to a double-stage extrusion unit with the extrusion molding temperature of less than 180 ℃ through a feeding screw rod, extruding the molten material in a quantitative and constant pressure manner, and performing extrusion molding through a die head to form a molten film;
step three: and (3) cooling: sending the molten film in the step two into flowing cooling water for cooling treatment, wherein the temperature of the cooling water is 30 ℃, and meanwhile, the cooling time is 30-45 min;
step four: cutting: cutting the cooled plastic film into blank wires with equal width by a blade;
step five: heating and stretching: placing the embryonic filaments obtained in the fourth step in an oven at the temperature of less than 150 ℃ to be subjected to high-power drawing until the embryonic filaments are drawn to form flat filaments;
step six: heat setting: placing the flat filaments formed by stretching in the step five on a hot press roller for heat setting, then shrinking the flat filaments at a low traction speed, and performing low-temperature treatment on a cold press roller, wherein the heat setting temperature of the hot press roller is 100 ℃, the cooling temperature of the cold press roller is less than 30 ℃, and the cooling treatment time is 1.5 hours;
step seven: and (3) static elimination: continuously subjecting the plastic filaments subjected to heat setting in the sixth step to static electricity removing treatment through a plurality of groups of compression roller assemblies consisting of two static electricity removing rods so as to remove static electricity on the surfaces of the plastic filaments;
step eight: coating: uniformly coating molten resin on the surface of the plastic wire subjected to the static electricity removal treatment in the step seven and immediately cooling to form a braided wire directly used for braiding;
step nine: rolling and forming: and (5) winding the braided wire which is coated with the film and cooled in the step eight.
Furthermore, in the above technical solution, the two-stage extruder set in the second step is composed of a parallel co-rotating twin-screw extruder with a screw diameter of 65mm and a single-screw extruder with a screw diameter of 150 mm.
Further, in the above technical solution, in the ninth step, a magnetic disk differential tension winding mechanism is selected to wind the knitting yarn.
Example 2:
different from the embodiment 1, the wire drawing process of the plastic woven bag comprises the following specific operation steps:
the method comprises the following steps: preparing raw materials: pouring polypropylene powder, various additives and activated calcium carbonate into a high-speed mixer according to a proper component proportion in sequence, fully stirring from low speed to high speed, conveying the mixture into a smelting furnace with the heating temperature of 230 ℃ through a feeding screw, and melting and plasticizing the fully mixed raw materials;
step two: extruding to form a film: conveying the molten material in the step one to a double-stage extrusion unit with the extrusion molding temperature of 180-200 ℃ through a feeding screw rod, extruding the molten material in a quantitative and constant pressure manner, and performing extrusion molding through a die head to form a molten film;
step three: and (3) cooling: sending the molten film in the step two into flowing cooling water for cooling treatment, wherein the temperature of the cooling water is 45 ℃, and meanwhile, the cooling time is 30-45 min;
step four: cutting: cutting the cooled plastic film into blank wires with equal width by a blade;
step five: heating and stretching: placing the embryonic filament in the fourth step in an oven at the temperature of 150-180 ℃ for high-power drawing until the embryonic filament is drawn to form a flat filament;
step six: heat setting: placing the flat filament formed by stretching in the step five on a hot press roller for heat setting, then shrinking the flat filament at a low traction speed, and performing low-temperature treatment on a cold press roller, wherein the heat setting temperature of the hot press roller is 130 ℃, the cooling temperature of the cold press roller is 30-50 ℃, and the cooling treatment time is 1.5 h;
step seven: and (3) static elimination: continuously subjecting the plastic filaments subjected to heat setting in the sixth step to static electricity removing treatment through a plurality of groups of compression roller assemblies consisting of two static electricity removing rods so as to remove static electricity on the surfaces of the plastic filaments;
step eight: coating: uniformly coating molten resin on the surface of the plastic wire subjected to the static electricity removal treatment in the step seven and immediately cooling to form a braided wire directly used for braiding;
step nine: rolling and forming: and (5) winding the braided wire which is coated with the film and cooled in the step eight.
Example 3:
different from the embodiments 1 and 2, the drawing process of the plastic woven bag comprises the following specific operation steps:
the method comprises the following steps: preparing raw materials: pouring polypropylene powder, various additives and activated calcium carbonate into a high-speed mixer according to a proper component proportion in sequence, fully stirring from low speed to high speed, conveying the mixture into a smelting furnace with the heating temperature of 250 ℃ through a feeding screw, and melting and plasticizing the fully mixed raw materials;
step two: extruding to form a film: conveying the molten material in the step one to a double-stage extrusion unit with the extrusion molding temperature of more than 200 ℃ through a feeding screw rod, extruding the molten material in a quantitative and constant pressure manner, and performing extrusion molding through a die head to form a molten film;
step three: and (3) cooling: sending the molten film in the step two into flowing cooling water for cooling treatment, wherein the temperature of the cooling water is 60 ℃, and meanwhile, the cooling time is 30-45 min;
step four: cutting: cutting the cooled plastic film into blank wires with equal width by a blade;
step five: heating and stretching: placing the embryonic filaments obtained in the fourth step in an oven at the temperature of more than 180 ℃ to be subjected to high-power drawing until the embryonic filaments are drawn to form flat filaments;
step six: heat setting: placing the flat filaments formed by stretching in the step five on a hot press roller for heat setting, then shrinking the flat filaments at a low traction speed, and performing low-temperature treatment on a cold press roller, wherein the heat setting temperature of the hot press roller is 150 ℃, the cooling temperature of the cold press roller is more than 50 ℃, and the cooling treatment time is 1.5 hours;
step seven: and (3) static elimination: continuously subjecting the plastic filaments subjected to heat setting in the sixth step to static electricity removing treatment through a plurality of groups of compression roller assemblies consisting of two static electricity removing rods so as to remove static electricity on the surfaces of the plastic filaments;
step eight: coating: uniformly coating molten resin on the surface of the plastic wire subjected to the static electricity removal treatment in the step seven and immediately cooling to form a braided wire directly used for braiding;
step nine: rolling and forming: the knitting yarn coated and cooled in the step eight is processed
And (6) rolling. From a comparison of examples 1 to 3, the following table can be prepared:
example 4:
unlike in all of examples 1 to 3, the molten film to be cooled in the third step was cooled in an air-cooled chamber having a cooling temperature of 30 to 60 ℃.
In contrast analysis, when the molded film product is cooled by an air cooling mode, the finished plastic wires are brittle due to uneven heating at different positions of the film surface, and the film product is easy to break in the using process, so that the film product is preferably cooled by a water cooling mode.
The working principle of the invention is as follows:
referring to the attached figure 1 of the specification, firstly, polypropylene powder, various additives and activated calcium carbonate are poured into a high-speed mixer according to a proper component ratio in sequence, the mixture is fully stirred from low speed to high speed and then is conveyed into a smelting furnace through a feeding screw, the fully mixed raw materials are melted and plasticized, the plasticized molten material is conveyed into a double-stage extruder set through the feeding screw to be extruded quantitatively and under constant pressure, the molten film is extruded and formed through a die head, then the molten film is conveyed into flowing cooling water to be cooled, after cooling, the cooled plastic film is cut into blank wires with equal width by a blade, then the blank wires are placed into a baking oven with higher temperature to be stretched in a high-power mode until the blank wires are stretched, then the flat wires formed by stretching are placed on a hot-pressing roller to be subjected to hot setting and then are shrunk under the condition of low drawing speed, and carrying out low-temperature treatment on the cold pressing roller, after the heat setting is finished, continuously carrying out static removing treatment on the plastic wires by a plurality of groups of pressing roller assemblies consisting of two static removing rods so as to remove static on the surfaces of the plastic wires, uniformly coating molten resin on the surfaces of the plastic wires subjected to the static removing treatment in the step seven, immediately cooling the plastic wires to form braided wires directly used for braiding, and finally, rolling the braided wires by using a magnetic disc differential tension rolling mechanism.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (1)
1. A wire drawing process for a plastic woven bag comprises the following specific operation steps: the method comprises the following steps: preparing raw materials: pouring polypropylene powder, various additives and activated calcium carbonate into a high-speed mixer according to a proper component proportion in sequence, fully stirring from low speed to high speed, conveying the mixture into a smelting furnace through a feeding screw, and melting and plasticizing the fully mixed raw materials; step two: extruding to form a film: conveying the molten material in the step one to a double-stage extrusion unit through a feeding screw rod, extruding the molten material in a quantitative and constant pressure manner, and extruding and molding the molten material through a die head to form a molten film; step three: and (3) cooling: feeding the molten film in the step two into cooling water or a cold air chamber for cooling treatment; step four: cutting: cutting the cooled plastic film into blank wires with equal width by a blade; step five: heating and stretching: placing the embryonic filaments in the fourth step in an oven with higher temperature to be stretched in a high power mode until the embryonic filaments are stretched to form flat filaments; step six: heat setting: placing the flat filaments formed by stretching in the step five on a hot-pressing roller for heat setting, then shrinking the flat filaments at a low traction speed, and performing low-temperature treatment on a cold-pressing roller; step seven: and (3) static elimination: continuously subjecting the plastic filaments subjected to heat setting in the sixth step to static electricity removing treatment through a plurality of groups of compression roller assemblies consisting of two static electricity removing rods so as to remove static electricity on the surfaces of the plastic filaments; step eight: coating: uniformly coating molten resin on the surface of the plastic wire subjected to the static electricity removal treatment in the step seven and immediately cooling to form a braided wire directly used for braiding; step nine: rolling and forming: winding the braided wire coated and cooled in the step eight;
the melting temperature of the mixture in the first step is 200-250 ℃;
the two-stage extruder set in the second step is formed by combining a parallel co-rotating double-screw extruder with the screw diameter of 65mm and a single-screw extruder with the screw diameter of 150 mm;
the extrusion molding temperature of the second step is 180-200 ℃;
the cooling water in the third step is selected from flowing cooling water, the cooling temperature is controlled to be 30-60 ℃, and the cooling time is 30-45 min;
the temperature in the oven in the step five is 150-180 ℃;
the heat setting temperature of the hot pressing roller in the sixth step is 100-150 ℃, the cooling temperature of the cold pressing roller is 30-50 ℃, and the cooling treatment time is 1.5 h;
and in the ninth step, a magnetic disk differential tension winding mechanism is selected to wind the braided wire.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811059540.1A CN109080102B (en) | 2018-09-12 | 2018-09-12 | Wire drawing process of plastic woven bag |
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| CN201811059540.1A CN109080102B (en) | 2018-09-12 | 2018-09-12 | Wire drawing process of plastic woven bag |
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| CN109080102A CN109080102A (en) | 2018-12-25 |
| CN109080102B true CN109080102B (en) | 2021-01-19 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111850838A (en) * | 2019-04-03 | 2020-10-30 | 浙江天润无纺布有限公司 | Non-woven fabric production process |
| CN112223717A (en) * | 2020-09-28 | 2021-01-15 | 何梦丹 | Preparation process of polypropylene plastic braided wire |
| TWI744108B (en) * | 2020-11-24 | 2021-10-21 | 勤倫有限公司 | Silk made by cutting film material and refined to improve physical properties and its production method |
| CN112519170A (en) * | 2020-11-30 | 2021-03-19 | 东营正宜包装股份有限公司 | Standard operation method for wire drawing process |
| CN112976529B (en) * | 2021-02-07 | 2022-05-31 | 烟台海湾塑料制品有限公司 | Flexible freight bag flat filament production line and production process thereof |
| CN113352698A (en) * | 2021-03-30 | 2021-09-07 | 南通联荣集团有限公司 | Energy-saving environment-friendly wire drawing processing technology of flexible freight bag |
| CN113306105B (en) * | 2021-05-27 | 2022-05-31 | 温州品豪包装有限公司 | Wire drawing machine is used in processing of plastic woven sack |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106182793A (en) * | 2016-08-23 | 2016-12-07 | 天津市旭辉恒远塑料包装股份有限公司 | A kind of drawing process of Polywoven Bag |
| CN108164730A (en) * | 2017-12-25 | 2018-06-15 | 安徽省临泉县万隆塑料包装有限公司 | A kind of Polywoven Bag of high tensile load |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106182793A (en) * | 2016-08-23 | 2016-12-07 | 天津市旭辉恒远塑料包装股份有限公司 | A kind of drawing process of Polywoven Bag |
| CN108164730A (en) * | 2017-12-25 | 2018-06-15 | 安徽省临泉县万隆塑料包装有限公司 | A kind of Polywoven Bag of high tensile load |
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