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Orientation control of modified plastics
by：CSSSLD
2021-01-23
Wen/VIP
orientation is plastic injection tooling modification of a kind of effective method, modified by orientation, can make the plastic mechanical properties, thermal properties, optical properties, electrical properties and the blocking performance and so on have been improved significantly. Orientation is said plastic products of plastic polymer in macromolecular chain as a whole or partial parallel arranged along a specific direction as the dominant phenomenon, this arrangement including the macromolecular chain, chain, wafer and zone. Ideal state of orientation for all macromolecular chains are arranged along the same direction, and thus destroy the plastic products need primary bond can overcome the macromolecular chain, such as plastic products should be the theory of strength and stiffness.
orientation make the plastic anisotropy, the higher the degree of orientation, the more serious the degree of anisotropy. Anisotropy in different direction, namely in the plastic products, have different performance. Usually in orientation direction is superior to the performance of the orientation direction on performance, especially in the tensile strength is obvious. In addition, due to the orientation and make the plastic products in the direction of the orientation and the refractive index difference on orientation direction, cause birefringence phenomenon, don't want this is optical plastic products.
orientation can be divided into two broad categories: category for plus tensile force role orientation, orientation along the direction of force, and can be divided into two uniaxial orientation and biaxial orientation, mainly is suitable for thin wall plastic extrusion and rolling forming, the other for processing action orientation, namely shear force or injection pressure role orientation, orientation along the direction of melt flow, mainly is suitable for injection molding and rolling forming, which is suitable for injection pressure, injection molding orientation force and calendaring orientation force for shear force.
the mechanism of plastic orientation plastic orientation under different condition. In the condition of viscous flow, the macromolecular chain can freedom of movement, thus it can be happen macromolecular chain orientation and chain orientation of two. The macromolecular orientation of viscous flow state depends on the force effect can occur, which depends on the injection pressure in injection molding, calendering forming by shear force, tensile force and extrusion molding.
in the high elastic state, the macromolecular chain cannot move, only the chain segment motion can occur. Some plastic products at this time there have been varying degrees of crystallization, in under the action of external force, consequently can occur chain orientation, if as a crystalline polymer, crystallization orientation can also occur. The crystal orientation of the original spherulite structure destruction into tiny grain, wafer or zone, along the direction of external force for the excellent arrangement, form a series of crystal structure.
plastic orientation process. Plastic orientation process for molecular chain relative displacement and crystal structure change process, this process must overcome the resistance of the plastic internal between molecules, and thus the orientation process is not completed in a flash, and need a process. In the condition of viscous flow, orientation generally occurs first segment orientation, and then by the synergy of segment orientation by the macromolecular chain orientation. Under the high elastic state and glass state, the macromolecular chain movement, macromolecular chain orientation, generally does not occur only chain orientation and crystal orientation.
orientation is a kind of macromolecular ordering process, orientation on the thermodynamic state of unstable thermodynamic system, thus orientation is not a spontaneous process, must rely on outside force function can be realized. Orientation, if not its curing for the glassy state, once the force is removed, what will happen the orientation, namely the spontaneous recovery from order to disorder.
more wonderful sharing: 【 Injection molding processing VIP 】 Liquid crystal polymer, click directly.
or copy the link: http://www. csssld。 cn//html/2016/Info_0417/205。 HTML
nantong on plastic products factory's official website: http://www. csssld。 Cn / /
source network trimmer/injection molding processing and VIP
orientation is plastic injection tooling modification of a kind of effective method, modified by orientation, can make the plastic mechanical properties, thermal properties, optical properties, electrical properties and the blocking performance and so on have been improved significantly. Orientation is said plastic products of plastic polymer in macromolecular chain as a whole or partial parallel arranged along a specific direction as the dominant phenomenon, this arrangement including the macromolecular chain, chain, wafer and zone. Ideal state of orientation for all macromolecular chains are arranged along the same direction, and thus destroy the plastic products need primary bond can overcome the macromolecular chain, such as plastic products should be the theory of strength and stiffness.
orientation make the plastic anisotropy, the higher the degree of orientation, the more serious the degree of anisotropy. Anisotropy in different direction, namely in the plastic products, have different performance. Usually in orientation direction is superior to the performance of the orientation direction on performance, especially in the tensile strength is obvious. In addition, due to the orientation and make the plastic products in the direction of the orientation and the refractive index difference on orientation direction, cause birefringence phenomenon, don't want this is optical plastic products.
orientation can be divided into two broad categories: category for plus tensile force role orientation, orientation along the direction of force, and can be divided into two uniaxial orientation and biaxial orientation, mainly is suitable for thin wall plastic extrusion and rolling forming, the other for processing action orientation, namely shear force or injection pressure role orientation, orientation along the direction of melt flow, mainly is suitable for injection molding and rolling forming, which is suitable for injection pressure, injection molding orientation force and calendaring orientation force for shear force.
the mechanism of plastic orientation plastic orientation under different condition. In the condition of viscous flow, the macromolecular chain can freedom of movement, thus it can be happen macromolecular chain orientation and chain orientation of two. The macromolecular orientation of viscous flow state depends on the force effect can occur, which depends on the injection pressure in injection molding, calendering forming by shear force, tensile force and extrusion molding.
in the high elastic state, the macromolecular chain cannot move, only the chain segment motion can occur. Some plastic products at this time there have been varying degrees of crystallization, in under the action of external force, consequently can occur chain orientation, if as a crystalline polymer, crystallization orientation can also occur. The crystal orientation of the original spherulite structure destruction into tiny grain, wafer or zone, along the direction of external force for the excellent arrangement, form a series of crystal structure.
plastic orientation process. Plastic orientation process for molecular chain relative displacement and crystal structure change process, this process must overcome the resistance of the plastic internal between molecules, and thus the orientation process is not completed in a flash, and need a process. In the condition of viscous flow, orientation generally occurs first segment orientation, and then by the synergy of segment orientation by the macromolecular chain orientation. Under the high elastic state and glass state, the macromolecular chain movement, macromolecular chain orientation, generally does not occur only chain orientation and crystal orientation.
orientation is a kind of macromolecular ordering process, orientation on the thermodynamic state of unstable thermodynamic system, thus orientation is not a spontaneous process, must rely on outside force function can be realized. Orientation, if not its curing for the glassy state, once the force is removed, what will happen the orientation, namely the spontaneous recovery from order to disorder.
more wonderful sharing: 【 Injection molding processing VIP 】 Liquid crystal polymer, click directly.
or copy the link: http://www. csssld。 cn//html/2016/Info_0417/205。 HTML
nantong on plastic products factory's official website: http://www. csssld。 Cn / /
source network trimmer/injection molding processing and VIP
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