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All information of PET pre-crystallization dehumidifying dryer

source:Plastic pellet dryer
Author:plastic dryer
time:2020年10月31日 10:37:04

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The characteristics of PET determine that it cannot be recycled through ordinary granulation methods. It must be recrystallized before it can be used. Amorphous PET will adhere to high temperatures. The main purpose of crystallization is to prevent the adhesion of PET during high temperature drying. As a result, the common method is to increase the stirring action while drying or use the airflow to boil the PET. When the temperature continues to rise, when the temperature reaches 120°, multiple molecular chains with intermolecular interactions are locally rearranged, resulting in spherical crystals, that is, crystallization , The maximum degree of crystallization of PET is about 55%, which can produce orderly crystalline regions.
The crystallization temperature of PET ranges from 120 to 140°C, and the crystallization time is 1 to 2 hours. The crystallization time is inversely proportional to the pre-crystallization temperature. The higher the drying temperature, the higher the drying rate; the shorter the drying time, the lower the moisture content of the raw material after drying. , The stirring temperature for crystal drying is usually between 120 and 160°C, and the temperature for dehumidification and drying is between 160 and 180°C. The PET is boiled by airflow while drying.
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The higher the drying wind speed, the higher the relative speed of PET and airflow, so the drying time will be shortened, but the dust generated by the system will increase accordingly, and the removal of excessive dust must be considered.
The lower the moisture content (dew point) of the hot air, the faster the drying rate of the raw materials, and the lower the corresponding equilibrium moisture of the raw materials. In the actual processing process, considering the processing cost and performance, for preforms or injection molding and extrusion molding, the dew point value is less than -40 ℃ to meet the raw material drying moisture content of less than 200ppm, the conventional pre-crystallization dryer on the market There are many problems such as clogging and shaft fracture.

Technical realization elements:

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The purpose is to provide a PET pre-crystallization dryer to overcome the shortcomings of the prior art.
In order to achieve the above objectives, this machine provides the following technical solutions.
The embodiment of the application discloses a PET pre-crystallization dryer, which is sequentially provided with a blanking bin, a mixing bin, and a storage bin which are connected to each other from top to bottom, and a sliding type is passed between the blanking bin and the stirring bin. The blanking valve is connected, a stirring shaft is arranged at the axis of the stirring chamber, a plurality of stirring blades are uniformly dislocated on the stirring shaft from top to bottom, and a self-lubricating shaft is sleeved in the middle of the stirring shaft. The opposite sides of the shaft are respectively formed with stirring blades, the bottom of the stirring chamber forms a cone, the evenly arranged stirring blades extend into the cone, and one side of the stirring chamber is provided with a blanking diffuser, and the blanking The air outlet of the diffuser forms an angle of 70° with the side of the vertebral body, and the bottom of the mixing bin and the top of the storage bin are directly connected through a certain amount of discharge valve.
Preferably, in the above-mentioned PET pre-crystallization dryer, a plurality of static mixers are uniformly arranged on the inner wall of the mixing chamber from top to bottom.
Preferably, in the aforementioned PET pre-crystallization dryer, a manual slide valve is provided between the quantitative discharge valve and the mixing chamber.
Preferably, in the aforementioned PET pre-crystallization dryer, a convection pipe is connected to the top side of the blanking bin and the top of the mixing bin.
Preferably, in the aforementioned PET pre-crystallization dryer, the stirring shaft is driven by a direct gear reducer.
Preferably, in the aforementioned PET pre-crystallization dryer, a filter is provided at the bottom of the sliding type blanking valve.
Preferably, in the above PET pre-crystallization dryer, a vacuum suction box with a hinged door is provided at the bottom of the storage bin.
The beneficial effect of the present invention is that the diffuser air outlet and the cone form a 70° angle, which ensures that the material is not blocked, and the inlet air forms a vortex backflow, which effectively diffuses the hot air to every point; the self-lubricating shaft minimizes the composite of the shaft , Effectively prevent the shaft from breaking and deforming; the physical stirring blade and the agitator shaft of the blanking port penetrate into the vertebral discharge area, which solves the problem of high-temperature melting and blocking of the blanking port.
Description of the drawings
In order to more clearly describe the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some of the embodiments described in this application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.
Figure 1 is a schematic diagram of a PET pre-crystallization dryer in a specific embodiment of the present invention.
Detailed ways
The technical solutions in the embodiments of the present invention will be described in detail below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.
It should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship: Based on the orientation or positional relationship shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood To limit the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance.
It should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be interpreted broadly, for example, it can be a fixed connection, a detachable connection, or an integral connection; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be a connection between two components. For those of ordinary skill in the art, the specific meanings of the above-mentioned terms in the present invention can be understood in specific situations.
As shown in Figure 1, the PET pre-crystallization dryer machine is provided with a blanking bin 100, a mixing bin 200, and a storage bin 300 that are connected to each other from top to bottom. The blanking bin 100 and the mixing bin 200 pass through a sliding type The blanking valve 110 is connected. A mixing shaft 210 is arranged at the axis of the mixing chamber 200. The mixing shaft 210 is uniformly staggered with a plurality of mixing blades 220 from top to bottom. A self-lubricating shaft 230 is sleeved in the middle of the mixing shaft 210. Stirring blades 240 are formed on opposite sides of the 230 respectively. A cone 250 is formed at the bottom of the mixing chamber 200. The evenly arranged stirring blades 220 extend into the cone 250. One side of the mixing chamber 200 is provided with a blanking diffuser 260 and a blanking diffuser 260. The air outlet 261 forms a 70° angle with the side of the cone 250, and the bottom of the mixing bin 200 and the top of the storage bin 300 are directly connected through a certain amount of discharge valve 270.
In this technical solution, the diffuser air outlet and the cone form a 70° angle to ensure that the material is not blocked, and the inlet air forms a vortex backflow, effectively spreading the hot air to every point; the self-lubricating shaft minimizes the composite of the shaft, Effectively prevent the shaft from breaking and deforming; the physical agitator blade and the agitator shaft of the blanking port penetrate into the vertebral discharge area, which solves the problem of high temperature melting and blocking of the blanking port.
Further, a plurality of static mixers 280 are evenly distributed on the inner wall of the mixing chamber 200 from top to bottom.
In this technical scheme, the amorphous mass on the barrel wall is effectively processed.
Further, a manual slide valve 290 is provided between the quantitative discharge valve 270 and the mixing chamber 200.
The larger caliber can effectively prevent materials from bridging.
Furthermore, a convection pipe 120 is connected to the top side of the blanking bin 100 and the top of the mixing bin 200.
It can assist in discharging materials with poor fluidity.
Further, the stirring shaft 210 is driven by a direct gear reducer.
Further, a filter 130 is provided at the bottom of the sliding type blanking valve 110.
Further, a vacuum suction box 310 with a hinged door is provided at the bottom of the storage bin 300.
It is easy to clean, and the probe can be set to facilitate observation.
It should be noted that relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any difference between these entities or operations. Kind of actual relationship or sequence. Moreover, the terms "include", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device that includes a series of elements includes not only those elements, but also includes Other elements of, or also include elements inherent to this process, method, article or equipment. If there are no more restrictions, the element defined by the sentence "including a..." does not exclude the existence of other same elements in the process, method, article, or equipment including the element.
The above are only specific implementations of this application. It should be pointed out that for those of ordinary skill in the art, without departing from the principles of this application, several improvements and modifications can be made. These improvements and modifications are also Should be regarded as the scope of protection of this application.

Technical features:

1. A PET pre-crystallization dryer, characterized in that a blanking bin (100), a mixing bin (200), and a storage bin (300) connected to each other are sequentially arranged from top to bottom, and the blanking bin ( 100) and the mixing chamber (200) are connected by a sliding type blanking valve (110), a mixing shaft (210) is arranged at the axis of the mixing chamber (200), and the mixing shaft (210) A plurality of stirring blades (220) are arranged uniformly and staggered to the bottom, a self-lubricating shaft (230) is sleeved in the middle of the stirring shaft (210), and the opposite sides of the self-lubricating shaft (230) are respectively formed with stirring blades (240) , A cone (250) is formed at the bottom of the mixing chamber (200), the evenly arranged mixing blades (220) extend into the cone (250), and one side of the mixing chamber (200) is provided with blanking The diffuser (260), the air outlet (261) of the blanking diffuser (260) forms a 70° angle with the side of the cone (250), and the bottom of the mixing chamber (200) is connected to the storage bin (300). ) The top is directly connected through a certain amount of discharge valve (270).
2. The PET pre-crystallization dryer according to claim 1, characterized in that a plurality of static mixers (280) are uniformly distributed from top to bottom on the inner wall of the mixing chamber (200).
3. The PET pre-crystallization dryer according to claim 1, wherein a manual slide valve (290) is provided between the quantitative discharge valve (270) and the mixing chamber (200).
The PET pre-crystallization dryer according to claim 1, characterized in that a convection pipe (120) is connected to the top side of the blanking bin (100) and the top of the mixing bin (200).
The PET pre-crystallization dryer according to claim 1, wherein the stirring shaft (210) is driven by a direct gear reducer.
The PET pre-crystallization dryer according to claim 1, wherein a filter (130) is provided at the bottom of the sliding type blanking valve (110).
7. The PET pre-crystallization dryer according to claim 1, characterized in that a vacuum suction box (310) with a hinged door is provided at the bottom of the storage bin (300).

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