Bottles Wholesale Pet Bottle Manufacturers, Custom Pet Bottles, Pet Bottles suppliers.
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So according to the bottle contents were to determine the size of the bottle portion. Parison neck size determine when the blow mold cavity dimensions and should be considered contraction after molding bottles, PET bottle blow air pressure inside the parison is 1.2MPa, the use of 5 ~ 10 ℃ cooling water cooling blow mold, the parison after blow to the rapid cooling. 5, bottle injection blow molding mandrel features
Injection blow molding mandrel function used mainly in five areas: (1) determine the shape of the inner diameter of the bottle neck forming the parison (2) in mechanical indexing process to take away the parison or bottle; ( 3) a mandrel provided with airway with air entrances, delivery of compressed air to inflate the parison; (4) inside the mandrel can pass circulating liquid or air, in order to adjust the temperature of the parison; (5) at the rear near the mandrel with 0.10 mm deep open side of the groove, so that the ends of the parison wedging groove, avoid blow station go to the parison forming station from the process, the parison its elastic shrinking lead to neck screw dislocation. Seal grooves play a role in reducing leakage during blow compressed air. 6, choose the value of length to diameter mandrel
Length and diameter of the mandrel is mainly determined by the parison, the mandrel diameter than the inner diameter of the bottle neck smaller, easy to release the bottle. But mandrel diameter should take large values ??as much as possible within the scope of the bottleneck inner diameter in order to avoid excessive blow-up ratio. Coaxial mandrel diameter should be within 0.05 to 0.08 mm. Bottle parts mandrel diameter is the outer diameter of the bottle and the bottle on the thickness, the range is usually dark green bottle bottle rod diameter equal to the outer diameter minus twice the wall thickness of the bottle.
Made by: http://www.petbottlemanufacturers.co
2015年7月31日星期五
2015年7月29日星期三
Sauce Bottles
Plastic Bottle Cap Manufacturers, Custom Pet Bottles, Pet Bottles suppliers.
Made by: https://www.plastic-bottle-manufacturers.com/plastic-bottle-cap-manufacturers/
During the drying process, due to the high temperature polyester drying hopper equipment should have good thermal insulation properties and the use of glass fiber insulation, should avoid contact with the dry polyester raw materials and outside air, because polyester raw material will rapidly absorb moisture from the air. For example, the polyester raw material is completely dried and a relative humidity of 35% to 40% after 12min of exposure to air, i.e., a moisture content of 0.005%. Medicinal PET bottle molding method
PET bottle molding methods are extrusion blow molding and injection blow molding two processes. Stretch blow another one-step and two-step process of the points. In the one-step molding, parison molding, cooling, heating, stretching were taken in order to complete the blow and bottle on a machine. Rule two steps by extrusion or injection molding the parison, and the parison was cooled to room temperature, becoming semi-finished products, and then the parison is reheated and stretch blow molding machine become bottle. That parison molding, stretch blow molding is done on the two machines, respectively. One-step injection blow molding PET bottles, injection blow molding equipment requires two molds that parison injection mold and blow mold. The injection molded preform is mainly composed of the parison mold cavity and the mandrel, its parameters are chosen size of each part is correct or not is the key to whether the shape of the bottle. Therefore, the size of the mold preform molding process parameters combined with a reasonable selection. 1, the ratio of the height of its neck PET bottle thread diameter of the mandrel can be determined parison aspect ratio (L / D)
Mandrel aspect ratio generally ranging principle is no more than 10: 1. This is because the parison mold mandrel as a cantilever, and by the effect of high injection pressure during filling. Selected aspect ratio is larger, its larger mandrel bent, likely to cause the parison wall thickness distribution is uneven.
Made by: https://www.plastic-bottle-manufacturers.com/plastic-bottle-cap-manufacturers/
During the drying process, due to the high temperature polyester drying hopper equipment should have good thermal insulation properties and the use of glass fiber insulation, should avoid contact with the dry polyester raw materials and outside air, because polyester raw material will rapidly absorb moisture from the air. For example, the polyester raw material is completely dried and a relative humidity of 35% to 40% after 12min of exposure to air, i.e., a moisture content of 0.005%. Medicinal PET bottle molding method
PET bottle molding methods are extrusion blow molding and injection blow molding two processes. Stretch blow another one-step and two-step process of the points. In the one-step molding, parison molding, cooling, heating, stretching were taken in order to complete the blow and bottle on a machine. Rule two steps by extrusion or injection molding the parison, and the parison was cooled to room temperature, becoming semi-finished products, and then the parison is reheated and stretch blow molding machine become bottle. That parison molding, stretch blow molding is done on the two machines, respectively. One-step injection blow molding PET bottles, injection blow molding equipment requires two molds that parison injection mold and blow mold. The injection molded preform is mainly composed of the parison mold cavity and the mandrel, its parameters are chosen size of each part is correct or not is the key to whether the shape of the bottle. Therefore, the size of the mold preform molding process parameters combined with a reasonable selection. 1, the ratio of the height of its neck PET bottle thread diameter of the mandrel can be determined parison aspect ratio (L / D)
Mandrel aspect ratio generally ranging principle is no more than 10: 1. This is because the parison mold mandrel as a cantilever, and by the effect of high injection pressure during filling. Selected aspect ratio is larger, its larger mandrel bent, likely to cause the parison wall thickness distribution is uneven.
2015年7月28日星期二
Glass Manufacturers
Glass Manufacturers Pet Bottle Manufacturers, Custom Pet Bottles, Pet Bottles suppliers.
Made by: http://www.petbottlemanufacturers.com
Polyester (PET) bottles blow for raw materials for the saturated linear thermoplastic polyester, mainly used performance indicators are: the intrinsic viscosity (IV) should be controlled at 70 ~ 85ml / g, making blow molded bottles with high mechanical strength and transparency; for large volume (greater than 2 liters) of the bottle, the selection of an intrinsic viscosity of polyester raw materials 70 ~ 75ml / g. Injection blow molding bottle Preferred pharmaceutically acceptable small volume higher intrinsic viscosity index is preferably a material production. Since the variety of raw materials selection is correct or not, related to the merits of the selection and quality of bottle production process molding process parameters. Thus, in the production of medicinal PET bottles, intrinsic viscosity of the raw materials, the crystallization temperature, cooling rate, and other process data alignment effect is particularly important. This is because the polyester material is a crystallizable polymer, the crystallization rate is small, only 6μm / min (max). Through process control crystallization conditions such as temperature and cooling rate, the polyester bottle into a non-crystalline or crystalline, and can change the crystal type and quantity. Crystallinity of the polyester requirements generally about 30%. At or slightly above the glass transition temperature slightly below the melting point, the crystallization rate of the polyester is small, crystallization takes a long time, at a temperature of about 175 ℃, the crystallization time is much shorter. In short, only by heating a crystalline polyester, the crystallization process is slow, it is possible to form a larger spherulite crystal, which refracts the light, so that white goods, and brittleness. Furthermore, with increasing the crystallization rate of the polyester decreases their Ⅳ. Ordered molecular orientation of the polyester can promote crystallization, the formed crystals called strain-induced crystalline, the grain is small, the light is not refracted, so oriented polyester article is transparent.
Made by: http://www.petbottlemanufacturers.com
Polyester (PET) bottles blow for raw materials for the saturated linear thermoplastic polyester, mainly used performance indicators are: the intrinsic viscosity (IV) should be controlled at 70 ~ 85ml / g, making blow molded bottles with high mechanical strength and transparency; for large volume (greater than 2 liters) of the bottle, the selection of an intrinsic viscosity of polyester raw materials 70 ~ 75ml / g. Injection blow molding bottle Preferred pharmaceutically acceptable small volume higher intrinsic viscosity index is preferably a material production. Since the variety of raw materials selection is correct or not, related to the merits of the selection and quality of bottle production process molding process parameters. Thus, in the production of medicinal PET bottles, intrinsic viscosity of the raw materials, the crystallization temperature, cooling rate, and other process data alignment effect is particularly important. This is because the polyester material is a crystallizable polymer, the crystallization rate is small, only 6μm / min (max). Through process control crystallization conditions such as temperature and cooling rate, the polyester bottle into a non-crystalline or crystalline, and can change the crystal type and quantity. Crystallinity of the polyester requirements generally about 30%. At or slightly above the glass transition temperature slightly below the melting point, the crystallization rate of the polyester is small, crystallization takes a long time, at a temperature of about 175 ℃, the crystallization time is much shorter. In short, only by heating a crystalline polyester, the crystallization process is slow, it is possible to form a larger spherulite crystal, which refracts the light, so that white goods, and brittleness. Furthermore, with increasing the crystallization rate of the polyester decreases their Ⅳ. Ordered molecular orientation of the polyester can promote crystallization, the formed crystals called strain-induced crystalline, the grain is small, the light is not refracted, so oriented polyester article is transparent.
2015年7月27日星期一
Glass Spray Bottles
Custom Plastic Water Bottles, Custom Pet Bottles, Pet Bottles suppliers.
Made by: http://www.plastic-bottle-manufacturers.com
Mainly used performance indicators are: the intrinsic viscosity (IV) should be controlled at 70 ~ 85ml / g, making blow molded bottles with high mechanical strength and transparency; for large volume (greater than 2 liters) of the bottle, the selection of an intrinsic viscosity of polyester raw materials 70 ~ 75ml / g. Injection blow molding bottle Preferred pharmaceutically acceptable small volume higher intrinsic viscosity index is preferably a material production. Since the variety of raw materials selection is correct or not, related to the merits of the selection and quality of bottle production process molding process parameters. Thus, in the production of medicinal PET bottles, intrinsic viscosity of the raw materials, the crystallization temperature, cooling rate, and other process data alignment effect is particularly important. This is because the polyester material is a crystallizable polymer, the crystallization rate is small, only 6μm / min (max). Through process control crystallization conditions such as temperature and cooling rate, the polyester bottle into a non-crystalline or crystalline, and can change the crystal type and quantity. Crystallinity of the polyester requirements generally about 30%. At or slightly above the glass transition temperature slightly below the melting point, the crystallization rate of the polyester is small, crystallization takes a long time, at a temperature of about 175 ℃, the crystallization time is much shorter. In short, only by heating a crystalline polyester, the crystallization process is slow, it is possible to form a larger spherulite crystal, which refracts the light, so that white goods, and brittleness. Furthermore, with increasing the crystallization rate of the polyester decreases their Ⅳ. Ordered molecular orientation of the polyester can promote crystallization, the formed crystals called strain-induced crystalline, the grain is small, the light is not refracted, so oriented polyester article is transparent. If the sample of polyester partially crystalline orientation as heat setting to make further crystallized sample remains transparent. Therefore, the crystal orientation of the impact and stretch blow molding of PET bottles during the key factor to ensure performance. If the hot filling of bottles with bar-type sterilization, but also on the part of the crystalline polyester for heat setting, the further crystallization so in order to improve heat resistance. 2, polyester material dehumidifying and drying。
Made by: http://www.plastic-bottle-manufacturers.com
Mainly used performance indicators are: the intrinsic viscosity (IV) should be controlled at 70 ~ 85ml / g, making blow molded bottles with high mechanical strength and transparency; for large volume (greater than 2 liters) of the bottle, the selection of an intrinsic viscosity of polyester raw materials 70 ~ 75ml / g. Injection blow molding bottle Preferred pharmaceutically acceptable small volume higher intrinsic viscosity index is preferably a material production. Since the variety of raw materials selection is correct or not, related to the merits of the selection and quality of bottle production process molding process parameters. Thus, in the production of medicinal PET bottles, intrinsic viscosity of the raw materials, the crystallization temperature, cooling rate, and other process data alignment effect is particularly important. This is because the polyester material is a crystallizable polymer, the crystallization rate is small, only 6μm / min (max). Through process control crystallization conditions such as temperature and cooling rate, the polyester bottle into a non-crystalline or crystalline, and can change the crystal type and quantity. Crystallinity of the polyester requirements generally about 30%. At or slightly above the glass transition temperature slightly below the melting point, the crystallization rate of the polyester is small, crystallization takes a long time, at a temperature of about 175 ℃, the crystallization time is much shorter. In short, only by heating a crystalline polyester, the crystallization process is slow, it is possible to form a larger spherulite crystal, which refracts the light, so that white goods, and brittleness. Furthermore, with increasing the crystallization rate of the polyester decreases their Ⅳ. Ordered molecular orientation of the polyester can promote crystallization, the formed crystals called strain-induced crystalline, the grain is small, the light is not refracted, so oriented polyester article is transparent. If the sample of polyester partially crystalline orientation as heat setting to make further crystallized sample remains transparent. Therefore, the crystal orientation of the impact and stretch blow molding of PET bottles during the key factor to ensure performance. If the hot filling of bottles with bar-type sterilization, but also on the part of the crystalline polyester for heat setting, the further crystallization so in order to improve heat resistance. 2, polyester material dehumidifying and drying。
2015年7月26日星期日
Pet Bottle Company
Custom Made Plastic Bottles, Custom Pet Bottles, Pet Bottles suppliers.
Made by: https://www.plastic-bottle-manufacturers.com
2.1 Preform
The preparation of blow molded bottles, PET chips first injection molded preforms, it requires twice the proportion of recycled material is not too high (5%), the recovery can not be more than twice the number of times, but not too low molecular weight and viscosity (molecular weight 31000- 50,000, intrinsic viscosity 0.78-0.85cm3 / g). Injection molded preform should be stored for more than 48h before using. After heating did not run out of preforms must then be stored for more than 48h before being reheated to use. Preform storage time should not exceed six months.
Preform depends largely on the merits of the merits of PET materials should be selected easy to blow, easy stereotypes of material, and develop a reasonable preform molding process. Experimental results show that the viscosity of the same material molding PET preforms, imported raw materials than domestic Yi blow molding; and the same batch of preforms, production dates are different, the blow molding process may also be quite different. Preform the merits of the decision to ease the blow molding process, the requirements of the preform is pure, transparent, free of impurities, the same color, length and injection points around coronatines appropriate. 2.2 heating
Preform is heated by the heating oven to complete, the temperature is set manually, automatically adjusted. Emit far infrared oven heated by the far infrared radiation preform tube, the bottom of the oven fan heat circulation, so the oven temperature uniformity. Preform in the oven at the same time moves forward rotation, so preform wall heat evenly.
Lamps arranged in an oven from top to bottom general was "zone" shape, more than two and less in the middle. Heat the oven by opening the number of lamps, the overall temperature setting, and each section was heated oven power than joint control. The lamp is turned in conjunction with the pre-blowing to be adjusted.
To play a better role oven, adjust its height, the cooling plate, etc. is very important, if adjusted properly, prone to swelling during blow bottle (bottle large), a hard head and neck (neck material will not pull out), etc. defects.
Made by: https://www.plastic-bottle-manufacturers.com
2.1 Preform
The preparation of blow molded bottles, PET chips first injection molded preforms, it requires twice the proportion of recycled material is not too high (5%), the recovery can not be more than twice the number of times, but not too low molecular weight and viscosity (molecular weight 31000- 50,000, intrinsic viscosity 0.78-0.85cm3 / g). Injection molded preform should be stored for more than 48h before using. After heating did not run out of preforms must then be stored for more than 48h before being reheated to use. Preform storage time should not exceed six months.
Preform depends largely on the merits of the merits of PET materials should be selected easy to blow, easy stereotypes of material, and develop a reasonable preform molding process. Experimental results show that the viscosity of the same material molding PET preforms, imported raw materials than domestic Yi blow molding; and the same batch of preforms, production dates are different, the blow molding process may also be quite different. Preform the merits of the decision to ease the blow molding process, the requirements of the preform is pure, transparent, free of impurities, the same color, length and injection points around coronatines appropriate. 2.2 heating
Preform is heated by the heating oven to complete, the temperature is set manually, automatically adjusted. Emit far infrared oven heated by the far infrared radiation preform tube, the bottom of the oven fan heat circulation, so the oven temperature uniformity. Preform in the oven at the same time moves forward rotation, so preform wall heat evenly.
Lamps arranged in an oven from top to bottom general was "zone" shape, more than two and less in the middle. Heat the oven by opening the number of lamps, the overall temperature setting, and each section was heated oven power than joint control. The lamp is turned in conjunction with the pre-blowing to be adjusted.
To play a better role oven, adjust its height, the cooling plate, etc. is very important, if adjusted properly, prone to swelling during blow bottle (bottle large), a hard head and neck (neck material will not pull out), etc. defects.
2015年7月23日星期四
Glass Bottle Manufacturing Process
Plastic Spray Bottle Manufacturers, Custom Pet Bottles, Pet Bottles suppliers.
Made by: https://www.plastic-bottle-manufacturers.com
Injection molding preforms and bottle blow-up ratio of the value of
Small volume injection blow molding of PET bottles, in the process of molding process, the parison occurs mainly axial tension. The smaller axial tension, the greater the blow ratio (ratio refers to the diameter of the bottle and the parison diameter), the possibility of uneven thickness distribution of the bottle greater, could easily lead to the shoulder and the bottle or bottle bottle and the bottle the bottom curved areas of uneven thickness transition region. Small flask body blow ratio generally take between 1.5 to 1.8. On the cross-section of the bottle oval, if it is less than the ratio of the length that is oval ellipse minor axis ratio 1.5: 1, may be circular in cross section forming a parison. Elliptic is no more than 2: 1, can be circular in cross section and oval mandrel parison molding. Ellipse ratio greater than 2: 1, the general requirements mandrel and parison cavity are designed into an oval. Ellipse ratio increases, the difficulty of the parison mold design and manufacturing costs were increased, generally should not exceed 3: 1.
4, injection molding parison mouth and neck size
Parison mouth diameter and thread size bottle size should thread of unity, and to match the thread size caps. In this regard due to the current absence of a unified national standard, so according to the bottle contents were to determine the size of the bottle portion. Parison neck size determine when the blow mold cavity dimensions and should be considered contraction after molding bottles, PET bottle blow air pressure inside the parison is 1.2MPa, the use of 5 ~ 10 ℃ cooling water cooling blow mold, the parison after blow to the rapid cooling.
5, bottle injection blow molding mandrel features
Injection blow molding mandrel function used mainly in five areas: (1) determine the shape of the inner diameter of the bottle neck forming the parison (2) in mechanical indexing process to take away the parison or bottle; ( 3) a mandrel provided with airway with air entrances, delivery of compressed air to inflate the parison; (4) inside the mandrel can pass circulating liquid or air, in order to adjust the temperature of the parison; (5) at the rear near the mandrel with 0.10 mm deep open side of the groove, so that the ends of the parison wedging groove, avoid blow station go to the parison forming station from the process, the parison its elastic shrinking lead to neck screw dislocation. Seal grooves play a role in reducing leakage during blow compressed air.
Made by: https://www.plastic-bottle-manufacturers.com
Injection molding preforms and bottle blow-up ratio of the value of
Small volume injection blow molding of PET bottles, in the process of molding process, the parison occurs mainly axial tension. The smaller axial tension, the greater the blow ratio (ratio refers to the diameter of the bottle and the parison diameter), the possibility of uneven thickness distribution of the bottle greater, could easily lead to the shoulder and the bottle or bottle bottle and the bottle the bottom curved areas of uneven thickness transition region. Small flask body blow ratio generally take between 1.5 to 1.8. On the cross-section of the bottle oval, if it is less than the ratio of the length that is oval ellipse minor axis ratio 1.5: 1, may be circular in cross section forming a parison. Elliptic is no more than 2: 1, can be circular in cross section and oval mandrel parison molding. Ellipse ratio greater than 2: 1, the general requirements mandrel and parison cavity are designed into an oval. Ellipse ratio increases, the difficulty of the parison mold design and manufacturing costs were increased, generally should not exceed 3: 1.
4, injection molding parison mouth and neck size
Parison mouth diameter and thread size bottle size should thread of unity, and to match the thread size caps. In this regard due to the current absence of a unified national standard, so according to the bottle contents were to determine the size of the bottle portion. Parison neck size determine when the blow mold cavity dimensions and should be considered contraction after molding bottles, PET bottle blow air pressure inside the parison is 1.2MPa, the use of 5 ~ 10 ℃ cooling water cooling blow mold, the parison after blow to the rapid cooling.
5, bottle injection blow molding mandrel features
Injection blow molding mandrel function used mainly in five areas: (1) determine the shape of the inner diameter of the bottle neck forming the parison (2) in mechanical indexing process to take away the parison or bottle; ( 3) a mandrel provided with airway with air entrances, delivery of compressed air to inflate the parison; (4) inside the mandrel can pass circulating liquid or air, in order to adjust the temperature of the parison; (5) at the rear near the mandrel with 0.10 mm deep open side of the groove, so that the ends of the parison wedging groove, avoid blow station go to the parison forming station from the process, the parison its elastic shrinking lead to neck screw dislocation. Seal grooves play a role in reducing leakage during blow compressed air.
Plastic Bottle Manufacturing Machine
Plastic Bottle Cap Manufacturer, Custom Pet Bottles, Pet Bottles suppliers.
Made by: http://www.plastic-bottle-manufacturers.com
The ratio of the height of its neck PET bottle thread diameter of the mandrel can be determined parison aspect ratio (L / D)
Mandrel aspect ratio generally ranging principle is no more than 10: 1. This is because the parison mold mandrel as a cantilever, and by the effect of high injection pressure during filling. Selected aspect ratio is larger, its larger mandrel bent, likely to cause the parison wall thickness distribution is uneven. However, through the program to control the melt filling speed or filling process using a sliding thimble temporarily secured to the mandrel head end of the mandrel, the mandrel diameter ratio advisable at this great value. Parison reference height is the height of the bottle body height obtained by multiplying the coefficient, the height of the bottle is generally 92% to 95%. In order to ensure good transparency of the bottle, a melt parison mold after filling, the temperature was quickly lowered to less 145 ℃, but than the glass transition temperature of the polyester material (82 ℃) higher and closer to the glass temperature, the higher the transparency of blown bottles. Parison mold cooling water temperature up to 10 ℃ ~ 35 ℃, for rapid cooling of the parison, it will take a liquid or gas to the mandrel continuous cooling, where cool air mandrel can have a more uniform temperature distribution, the air pressure is generally about 1MPa.
2, the melt temperature of the preform during injection
????The melt temperature is an important parameter PET preform molding to note. From the viewpoint of equipment, screw design have a greater impact on the PET melt, mix and melt temperature. PET injection to the use of low shear, low compression ratio (about 2/1) of the screw, made longer feed section, a transition section and a metering section made shorter. Barrel temperature of the device a greater impact on the melt temperature, barrel temperature increase will reduce the intrinsic viscosity of the PET melt. Barrel temperature had a significant effect on the parison transparency, improve cylinder temperature can improve the transparency of the parison. For example, when a barrel temperature of 280 ℃, the corresponding melt temperature of 290 ℃, can ensure optimal transparency parison. The barrel temperature increase does not improve further transparency. Lower barrel temperatures, an appropriate increase in screw speed to clap gate temperature, small quantities can improve the transparency of the parison. However, due to the hot runner system melt through time is short, to a lesser extent the temperature of the parison transparency improvement. Increase the injection pressure, i.e., when the injection rate, the heat generated when high shear melt through the nozzle, the melt temperature is significantly improved, so that the barrel temperature can be lower transparent molded parison. Higher packing pressure will increase the rate of crystallization when cooling the melt parison mold, reducing the transparency of the parison, especially at lower cylinder temperature.
Made by: http://www.plastic-bottle-manufacturers.com
The ratio of the height of its neck PET bottle thread diameter of the mandrel can be determined parison aspect ratio (L / D)
Mandrel aspect ratio generally ranging principle is no more than 10: 1. This is because the parison mold mandrel as a cantilever, and by the effect of high injection pressure during filling. Selected aspect ratio is larger, its larger mandrel bent, likely to cause the parison wall thickness distribution is uneven. However, through the program to control the melt filling speed or filling process using a sliding thimble temporarily secured to the mandrel head end of the mandrel, the mandrel diameter ratio advisable at this great value. Parison reference height is the height of the bottle body height obtained by multiplying the coefficient, the height of the bottle is generally 92% to 95%. In order to ensure good transparency of the bottle, a melt parison mold after filling, the temperature was quickly lowered to less 145 ℃, but than the glass transition temperature of the polyester material (82 ℃) higher and closer to the glass temperature, the higher the transparency of blown bottles. Parison mold cooling water temperature up to 10 ℃ ~ 35 ℃, for rapid cooling of the parison, it will take a liquid or gas to the mandrel continuous cooling, where cool air mandrel can have a more uniform temperature distribution, the air pressure is generally about 1MPa.
2, the melt temperature of the preform during injection
????The melt temperature is an important parameter PET preform molding to note. From the viewpoint of equipment, screw design have a greater impact on the PET melt, mix and melt temperature. PET injection to the use of low shear, low compression ratio (about 2/1) of the screw, made longer feed section, a transition section and a metering section made shorter. Barrel temperature of the device a greater impact on the melt temperature, barrel temperature increase will reduce the intrinsic viscosity of the PET melt. Barrel temperature had a significant effect on the parison transparency, improve cylinder temperature can improve the transparency of the parison. For example, when a barrel temperature of 280 ℃, the corresponding melt temperature of 290 ℃, can ensure optimal transparency parison. The barrel temperature increase does not improve further transparency. Lower barrel temperatures, an appropriate increase in screw speed to clap gate temperature, small quantities can improve the transparency of the parison. However, due to the hot runner system melt through time is short, to a lesser extent the temperature of the parison transparency improvement. Increase the injection pressure, i.e., when the injection rate, the heat generated when high shear melt through the nozzle, the melt temperature is significantly improved, so that the barrel temperature can be lower transparent molded parison. Higher packing pressure will increase the rate of crystallization when cooling the melt parison mold, reducing the transparency of the parison, especially at lower cylinder temperature.
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