TAIRONG MACHINERY
Pet Flakes IV increasing Crystallizer Drier
What’s it special for our designing crystallization and drying system.
Pet flake is a very special material, it has two big problems ,
- Water
- Viscosity ----IV
Water and IV are effect each other. When has water in the flakes, the IV is lower than 0.68. It is easy to obsorb water and wet from the air . it is like foam , when touch air , it start to take up humidity from the air. When pet get even less wet, the final products will get problems:
- Pet sheet/film: if wet pet material, the pet sheet/film will not transparent , like foggy on the surface of glass. It will have wave. It will easy to broken , it will not easy to extruding into sheet/film. It will not easy to process on the thermal forming machine.
- Pet straps: this straps use to pack commodities, it need high strength in stretching , in broken force . if has water in the material, can not make high broken force and stretching straps . the IV must above 0.75 can make good straps
So, how to get rid of the water from the pet flakes, is the head and first important step in the pet material processing.
- One is horizontal only by electric drier when mixing . this drier mostly using to make pet monofilament , because pet monofilament is not very hard for request the IV and water content, so , some people is using .
- Another is vertical molecular humidity removing system.
This system electricity consumption very high. Also need always heating.
This system before we also used. But after we used a long time, we give up. Because this unit can not really get rid of the water from the material of the hopper evenly. The hopper top has motor, drive a shaft , shaft has blade. When blade turning , material always fall down to the bottom, so , can not mix evenly .
To avoid high electric consumption and not evenly heating and mixing, we developed a practical and economical new system as below :
this system is different with all other factory’s system, we have special designing .
1.oil enclosed heating the pet scraps. Oil can keep a stable and high temperature to the scraps, the scraps can get evenly heating , and get fine crystallization and drying effect .
2.strong drive gear and chain, ensure the container working in a stable condition
3.two tanks working together insure long time heating , to keep a big capacity of processing .
4.After the pet flakes finished drying , open the discharge gate, material will discharge into a material container, your extruder has feeding system, this feeding system can connect with the material container, feeding into your extruder hopper.
5.Dosing
Your straps line’s hopper I think has material level control switch, when feeding to the required level, the auto feeding system will stop automatically . when feeding to the drying hopper, we had installed the same switch , when the hopper is full or material arrive to a set level , feeding system will stop automatically. if your straps line has not this switch, we can provide to you, also the auto feeding system , we can provide to you.
6.Vacuum humidity exhaust
In the hopper, there is vacuum pump connection hole, we will install vacuum pump to exhaust humidity from the hopper .(please see the picture vacuum pump hole)
7.Dust removing system we have , please see picture . dust bags connect with the hot air drying system
8.The drier controlled by PID controlling system. There will be a electric cabinet connect with the drier. (see picture )
There are temperature meter will installed , can set the temperature for heating, when hopper arrive the temperature, will stop heating automatically ..
9.The hopper turning speed: 5-6 rotary per minute.
Our this drier, you can use directly after connect with electric. We will install all necessary units . this picture drier did not finish . we welcome you come to visit us.
Working principle :
Tank shape design, double layer, media: oil. Heating in the inner layer, inner layer transfer the heating to PET scraps. Water in the scraps become vapor , vacuum pump will exhaust the water to dry the scraps
1.Vacuum drying, produce high ratio in low temperature, drying capacity can arrive double times than normal drying system. Save energy , high thermal usage ratio . Specially suitable to dry thermal sensitive and easy-oxidation material.
2.Close drying style, products no leakage , no pollution, suitable for excitant and poison material
3..Material get drying in the mixing , can reduce the water content to be the lowest as well as evenly drying. This unit suitable for different material drying .
4. Structure design compact, small area occupy , easy operation , low labor need.
main structure
1inner layer adopt stainless steel, outer layer adopt boiler steel plate.
2 speed reducer drive system
3 dust remover system
.4 sealing unit
5 vacuum exhaust units
Easy type Drawing
PET dryer, PET Continual crystal drying machine, plastic dryer |
| CSGTechnical Standards: |
Drying material | Moisture content | drying time(H) | Dry temperature() | DRA-30ZL | P-50 | P-100 | D-400 | D-800 | D-1600 | |
initial period | Drying period | |||||||||
ABS | 0.4 | 0.08 | 2~3 | 80 | 12 | 50 | 100 | 200 | 400 | 800 |
PA6 | 0.6 | 0.1 | 4~6 | 75 | 10 | 40 | 80 | 160 | 320 | 640 |
PA6.6 | 0.6 | 0.1 | 4~6 | 75 | 10 | 40 | 80 | 160 | 320 | 640 |
PC | 0.3 | 0.02 | 2~3 | 120 | 12 | 50 | 100 | 200 | 400 | 800 |
PE | - | - | 1~2 | 80 | 15 | 60 | 120 | 240 | 480 | 960 |
PEB | 0.3 | 0.05 | 3~5 | 90 | 10 | 40 | 80 | 160 | 320 | 640 |
PET | 0.3 | 0.01 | 4~6 | 150 | 10 | 40 | 80 | 160 | 320 | 640 |
PBT | 0.3 | 0.01 | 3~5 | 150 | 10 | 40 | 80 | 160 | 320 | 640 |
PMMA | 0.5 | 0.05 | 3~5 | 80 | 10 | 40 | 80 | 160 | 320 | 640 |
POM | 0.2 | 0.03 | 2~3 | 100 | 11 | 50 | 100 | 200 | 400 | 800 |
PP | - | - | 1~2 | 90 | 15 | 60 | 120 | 240 | 480 | 960 |
PPO | 0.2 | 0.03 | 2~3 | 120 | 12 | 50 | 100 | 200 | 400 | 800 |
PS | - | - | 1~2 | 80 | 15 | 60 | 120 | 240 | 480 | 960 |
PUR | 0.5 | 0.03 | 3~5 | 90 | 10 | 40 | 80 | 160 | 320 | 640 |
PVC | 0.2 | 0.05 | 2~3 | 80 | 12 | 50 | 100 | 200 | 400 | 800 |
SAN | 0.2 | 0.05 | 2~3 | 80 | 12 | 50 | 100 | 200 | 400 | 800 |
OETG | 0.3 | 0.05 | 4~6 | 65 | 10 | 40 | 80 | 160 | 320 |
|
PPS | 0.2 | 0.02 | 3~5 | 150 | 10 | 40 | 80 | 160 | 320 |
|
Production in Client's Factory
What is pet scraps crystallization and drying mean? ------crystallization ≠ pre-crysltalliation
When we mean pet bottle scraps, we all know this material is special, it need crystallization and drying. But here has a understanding wrong region . crystallization and pre- crystallization are different concepts, pet material when get heating , it will appear different shape and characters when stay in different temperature . when the heating temperature arrive to 120-130degree, pet scraps ‘s surface moisture start to evaporate, scraps easy to stick together , if no mixing within this stage, scraps will concretion to be one big solid . this is the reason why need turn and mix the scraps when heating.
When the temperature arrive 120-130 degree, we call this stage : pre- crystallization, pre- crystallization is preparing to rise higher temperature until to get rid of remained moisture from the molecule of scraps. pre- crystallization can put in the common heaters, also can put in the mechanical turning and mixing equipment , the last one is better because when scraps turning in the container, it also can produce friction heating when moving , the container if has other heating system will be the best. When the pet flakes lost transparent , we says pre- crystallization finished .
when the temperature entre into 160-180degree, moisture from the molecule start to come out . more long time heating, more water will come out . when the heating time get long, the air dew will down . when the dew down to -50,pet flakes moisture contents will lower than 0.05%, only in this water rate, the pet flake will not hydrolyze and lost viscosity in the screw heating. This is the reason why need 4-6 hours heating in the heating system .
when temperature arrive 230 degree, it start to crystallization and decomposition , when 260-280 degree, start to melt .
SGS Certification 
If any questions,please feel free to contact us soon. Thanks.
Contact person:Mr Jason
Mobile:86-15151456568(Available at any time.)
Skype:vipjasonwu
China