CN101336152A - Strat-up procedure for underwater pelletizer - Google Patents
Strat-up procedure for underwater pelletizer Download PDFInfo
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- CN101336152A CN101336152A CNA2006800517581A CN200680051758A CN101336152A CN 101336152 A CN101336152 A CN 101336152A CN A2006800517581 A CNA2006800517581 A CN A2006800517581A CN 200680051758 A CN200680051758 A CN 200680051758A CN 101336152 A CN101336152 A CN 101336152A
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- template
- temperature
- thermoplastic resin
- extruding
- molten mass
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000000034 method Methods 0.000 title claims abstract description 52
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 238000010438 heat treatment Methods 0.000 claims abstract description 17
- 229920005992 thermoplastic resin Polymers 0.000 claims description 58
- 229920001684 low density polyethylene Polymers 0.000 claims description 19
- 239000004702 low-density polyethylene Substances 0.000 claims description 19
- 230000008569 process Effects 0.000 claims description 13
- 238000009413 insulation Methods 0.000 claims description 10
- -1 polyethylene Polymers 0.000 claims description 7
- 238000001125 extrusion Methods 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 230000007704 transition Effects 0.000 claims description 5
- 238000005259 measurement Methods 0.000 claims description 3
- 239000006187 pill Substances 0.000 claims description 3
- 239000004698 Polyethylene Substances 0.000 claims 3
- 229920000573 polyethylene Polymers 0.000 claims 3
- 229920000642 polymer Polymers 0.000 abstract description 22
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 230000001939 inductive effect Effects 0.000 abstract 1
- 229920001903 high density polyethylene Polymers 0.000 description 10
- 239000004700 high-density polyethylene Substances 0.000 description 10
- 239000004743 Polypropylene Substances 0.000 description 8
- 239000000498 cooling water Substances 0.000 description 8
- 229920001155 polypropylene Polymers 0.000 description 8
- 229920000092 linear low density polyethylene Polymers 0.000 description 6
- 239000004707 linear low-density polyethylene Substances 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- 239000011347 resin Substances 0.000 description 6
- 238000005469 granulation Methods 0.000 description 5
- 230000003179 granulation Effects 0.000 description 5
- 230000015271 coagulation Effects 0.000 description 3
- 238000005345 coagulation Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229920010126 Linear Low Density Polyethylene (LLDPE) Polymers 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011342 resin composition Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2793/00—Shaping techniques involving a cutting or machining operation
- B29C2793/0027—Cutting off
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0022—Combinations of extrusion moulding with other shaping operations combined with cutting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/04—Particle-shaped
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/269—Extrusion in non-steady condition, e.g. start-up or shut-down
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
- B29C48/86—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the nozzle zone
- B29C48/87—Cooling
Landscapes
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
The invention relates to a method for starting up or stopping and restarting an underwater pelletizer is described. The method involves inducing partial freeze-off of the polymer melt in the holes of an internally insulated die plate to prevent polymer drool by passing full water flow across the face of the die plate. The method advantageously does not require using hot oil to heat the die plate or decreasing and/or increasing the heating provided to the die plate.
Description
Technical field
The present invention relates generally to a kind of improving one's methods of underwater pelletizer that be used to start.
Background technology
Polymer pellets usually by the extruded polymer molten mass by having the template for preparing in a plurality of holes.Typically, this template is to be immersed in the cold rinse bank, solidifies when polymer polymer when template is come out thus.When polymer leaves a mouthful mould (die), by rotating blade through port mould surface polymer is cut into pill, and polymer is washed away with cold water stream.
The commonsense method that starts underwater pelletizer is that order is carried out the start-up routine step.This is included in molten polymer in proper order by making water process template in several seconds before the pattern hole.Yet sequence starting may be difficult, and particularly large-scale underwater pelletizer is because the discharge of necessary timing process template is so that the just in time granulation of Huo Dechenggonging.Before the water process template of capacity, the excessive tear drop (drool) of polymer melt can cause the pellet quality of difference and the startup of failure to be attempted.Vice versa.If to flow through template long-time excessively for water before forming melt flows, may frozen (freeze off) and operates and may be hindered in the hole.
In order to address this problem, attempted starting underwater pelletizer, promptly with sufficient current process template, yet this kind attempted needing to use thermal oil system that template is heated to very high temperature.Thermal oil system is not only expensive, and causes for example safety and the environmental problem of inflammability and the property disposed.
Therefore, need in the art a kind of easy operating more (forgiving), cheap, safety, environmental friendliness and stable start-up routine are particularly used the underwater pelletizer of Steam Heating template to be used for underwater pelletizer more.
The invention summary
Found unexpectedly a kind ofly successfully to start the method for comminutor with full water-flow through template, wherein this template is not with the oil heating.Therefore, an aspect the invention provides a kind of method that starts thermoplastic resin pelletizer.This method may further comprise the steps:
(a) provide a kind of thermoplastic resin pelletizer with inner heat insulation template;
(b) thermoplastic resin melt of heating in comminutor arrives Tm+30 ℃ to Tm+200 ℃ temperature, and wherein Tm is the melting transition temperature with the thermoplastic resin of ASTM D-3418 measurement;
(c) heated die plate is to Tm+50 ℃ to Tm+250 ℃ temperature;
(d) before extruding thermoplastic resins molten mass process template, make to have Tm-20 ℃ of water process template surface certain hour to Tm-50 ℃ of temperature, this time is enough solidified the thermoplastic resin melt of at least a portion in pattern hole; With
(e) the extruding thermoplastic resins molten mass is through template.
Aspect another one, the invention provides a kind of method that stops and restarting thermoplastic resin pelletizer, wherein this comminutor has inner heat insulation template.This method may further comprise the steps:
(a) stop the extruding thermoplastic resins molten mass through template;
(b) keep water to spend the template surface regular hour with the temperature flow of using during extruding, this time enough is set at least a portion of the thermoplastic resin melt in the pattern hole;
(c) thermoplastic resin melt in the comminutor is remained on the temperature of using when extruding;
(d) template is remained on the temperature of using when extruding; With
(e) restart the extruding thermoplastic resins molten mass and pass through template.
Detailed Description Of The Invention
On the one hand, the invention provides a kind of method that starts thermoplastic resin pelletizer.The first step of this method comprises provides a kind of thermoplastic resin pelletizer with inner heat insulation template.Any comminutor that can the extruding thermoplastic resins material all can use.Being suitable for the heat insulation template in inside used in this invention is known in the art, for example those U.S. Patent No. US 4752196 and 4856974 and EP 0246921 in describe; Therefore their content is merged in by reference.
As use herein, the meaning of word " extruder ", " extruding (extruding) ", " extruding (extrusion) " is not limited.They comprise that all increase resin melt pressure after template is so that promote the pattern of resin melt through pattern hole.These patterns comprise the positive displacement arrangements (positive displacement) of single screw extrusion machine, multi-screw extruder and for example gear pump.
Second step of this method relates to the temperature that the thermoplastic resin melt of heating in comminutor arrives Tm+30 ℃ to Tm+200 ℃, and wherein Tm is the melting transition temperature with the thermoplastic resin of ASTM D-3418 measurement.For low density polyethylene (LDPE) (LDPE), for example, it has about 110 ℃ Tm, and resin melt will have from 230 ℃ to 300 ℃ temperature range.Preferably, the LDPE melt temperature is 250 ℃.For other thermoplastic resin, for example linear low density polyethylene (LLDPE) (LLDPE), high density polyethylene (HDPE) (HDPE) and polypropylene (PP), the polymer melt temperature can be 230 ℃.Other for example the thermoplastic resin of polyester also will comprise within the scope of the invention.
The 3rd step of this method relates to heated die plate to Tm+50 ℃ to Tm+250 ℃ temperature.Template is preferably by Steam Heating, but the heating mode that also can consider other electrical heating elements for example.For LDPE, for example, die plate temperature can be in 225 ℃ to 260 ℃ scope.Preferably, the situation lower bolster temperature at LDPE is 225 ℃.For other thermoplastic resin of LLDPE, HDPE and PP for example, die plate temperature can be 250 ℃.
Usually can in typical equipment, obtain steam in 600 pound per square inches (psi) air pressure.Under the steam heated situation of template, according to required die plate temperature, the scope of steam pressure can be 100 to 600psi.
The 4th step of this method relates to before extruding thermoplastic resins molten mass process template, makes to have the Tm-20 ℃ of water process template surface certain hour to Tm-50 ℃ of temperature, and this time is enough solidified the thermoplastic resin of at least a portion in pattern hole.Can be by using the water tank cooling water supply that can be installed on the template, this is known in the art.Under the situation of LDPE, for example, water can have 60 ℃ to 90 ℃ temperature.Preferably, water temperature is 75 ℃.For example under the situation of the thermoplastic resin of HDPE, LLDPE and PP, water temperature can be 70 ℃ to 90 ℃ at other.
Be clearly to those skilled in the art, the time of enough solidifying the thermoplastic resin melt of at least a portion in pattern hole can change according to a plurality of factors, and these factors comprise resin composition, melt temperature, die plate temperature, the heat insulation amount in template and cooling water temperature and flow velocity.Equally, coagulation grade also can change.Thermoplastic resin in pattern hole will have enough low viscosity so that reduction or prevention polymer tear drop (drool) and cooling water pass back in the extruder, but should not make it will produce too many negative pressure and have to restart polymer molten fluid (this kind condition is referred to as to freeze (freeze-off) usually).Usually, this time can be for for example surpassing time several seconds to a few hours of 5 seconds or longer.Preferably, this time is 1 minute to 30 minutes, and more preferably 5 minutes to 25 minutes.
Step 2-4 can random order or execution simultaneously.
Finally, the extruder in comminutor can be activated and can begin the extruding thermoplastic resins molten mass and pass through template.
By utilizing above-mentioned steps and condition, can flow through template with the water of abundance and do not use oily heated die plate to start comminutor.
Aspect another one, the invention provides a kind of method that is used to stop and restarting thermoplastic resin pelletizer, wherein this comminutor has inner heat insulation template.In the thermoplastic resin pelletizer of (also being extruded polymer) that turns round, the first step in this method relates to and stops the extruding thermoplastic resins molten mass through template.Suitable comminutor, thermoplastic resin and template are as mentioning in aspect first.Can partly carry out this step by the extruder that stops in the comminutor.
At the stopping period of extruder, be used for the rotating blade that the extruded polymer molten mass cuts into pill can being kept rotation or stopping.
Second step of this method relates to and keeps water used temperature flow when extruding to cross the template surface certain hour, and this time enough is set at least a portion of the thermoplastic resin in the pattern hole.Preferably, the temperature of the water of process template surface remains on Tm-20 ℃ to Tm-50 ℃.Can be by using the water tank cooling water supply that can be installed in the template top, this is known in the art.Under the situation of LDPE, for example, water can have 60 ℃ to 90 ℃ temperature.Preferably, water temperature is 75 ℃.For example under the situation of the thermoplastic resin of HDPE, LLDPE and PP, water temperature can be 70 ℃ to 90 ℃ at other.
Generally, when continuous cooling water flow through template surface, extruder can be stopped for example 5 seconds several seconds to a few hours or longer time.Preferably, this time is 1 minute to 30 minutes, and more preferably 5 minutes to 25 minutes.
The 3rd of this method goes on foot to relate to the thermoplastic resin melt in the comminutor is remained on the temperature of using when extruding.The typical case is, the thermoplastic resin melt in the comminutor can be maintained at Tm+30 ℃ to Tm+250 ℃ temperature, and wherein Tm is the melting transition temperature of the thermoplastic resin measured with ASTM D-3418.For example for LDPE, it has about 110 ℃ Tm, and resin melt typical case has scope from 230 ℃ to 300 ℃ temperature.Preferably, the LDPE melt temperature is 250 ℃.For other thermoplastic resin of linear low density polyethylene (LLDPE) (LLDPE), high density polyethylene (HDPE) (HDPE) and polypropylene (PP) for example, the polymer melt temperature can be 230 ℃.
The 4th step of this method comprises template is remained on the temperature of using when extruding.Typical die plate temperature is between Tm+50 ℃ to Tm+250 ℃.Template still can consider that also other heating mode for example passes through electrical heating elements preferably by Steam Heating.For LDPE, for example, die plate temperature can be 225 ℃ to 260 ℃.Preferably, the situation lower bolster temperature at LDPE is 225 ℃.For other thermoplastic resin of LLDPE, HDPE and PP for example, die plate temperature can be 250 ℃.
In template is under the steam heated situation, and according to required die plate temperature, steam pressure can be 100 to 600psi.
In the 5th step,,, can restart the extruding thermoplastic resins molten mass and pass through template by the initial motion of extruder after after a while.
As first aspect, method imagination of the present invention is induced the resin material of partial coagulation in pattern hole by allowing sufficient water to flow through template surface, just as extruder is also turning round.By partial coagulation, this just means the abundant solid state (or low viscosity) of resin material quilt in pattern hole, with minimize or or stop polymer tear drop and cooling water to pass back in the extruder, but should not make it produce too many negative pressure and have to restart and extrude.
The advantage of the inventive method is owing to safeguarding or fault is got rid of or other reason, and the granulation function is stopped and restarting by of short duration, and does not need to reduce and/or increase die plate temperature, reduces and/or increase can slow down operation or make complex operation of die plate temperature.
The example of the preferred embodiment by is subsequently further set forth the present invention, should be understood that these examples only are used for illustrative purposes, do not attempt to limit scope of the present invention.
Embodiment
Fusion LDPE in the equipment of the single screw extrusion machine with 500mm diameter, heat insulation template and 18 rotating granulation blades with about 1200 holes.This template is the type of describing in U.S. Patent number 4752196.
Following table 1 shows according to the template steam pressure that starts under the exemplary water of the present invention, polymer melt temperature, comminutor discharge, comminutor water temperature, extruded velocity and granulation machine knife speed over time.
| Time (minute) | Template steam pressure (psig) | The polymer melt temperature (℃) | The comminutor water temperature (℃) | Comminutor water velocity (gps) | Granulation machine knife speed (rpm) | Extruded velocity (rpm) |
| 0 | ～430 | ～190 | ～60 | 0 | 0 | 0 |
| 1.5 | ～430 | ～190 | ～60 | Beginning | 0 | 0 |
| 2 | ～410 | ～190 | ～60 | ～26 | Beginning | 0 |
| 5 | ～420 | ～190 | ～60 | ～25 | ～340 | Beginning |
| 10 | ～425 | ～200 | ～60 | ～26 | ～340 | ～35 |
As shown in table 1, when time=0, the template steam pressure is about 430psig, and the polymer melt temperature is about 190 ℃, and the comminutor water temperature is about 60 ℃.
When time=1.5 minute, cooling water is about 60 ℃ temperature, begins to flow through template surface.Extruder speed is set to 0rpm.
When time=2 minute, cooling water flows with about 26 gallons of per seconds (gps), and granulator blade begins rotation.Extruder speed still is set to 0rpm.
When time=5 minute, start and before polymer flow began, water flow through template 3.5 minutes at extruder.
When time=10 minute, extruder speed is about 35rpm.
Claims (16)
1, a kind of method that starts thermoplastic resin pelletizer comprises:
(a) provide thermoplastic resin pelletizer with inner heat insulation template;
(b) thermoplastic resin melt of heating in comminutor arrives Tm+30 ℃ to Tm+200 ℃ temperature, and wherein Tm is the melting transition temperature with the thermoplastic resin of ASTM D-3418 measurement;
(c) the described template of heating arrives Tm+50 ℃ to Tm+250 ℃ temperature;
(d) before extruding thermoplastic resins molten mass process template, make to have Tm-20 ℃ of water process template surface certain hour to Tm-50 ℃ of temperature, this time is enough solidified the thermoplastic resin melt of at least a portion in pattern hole; With
(e) the extruding thermoplastic resins molten mass is through template.
2, according to the method in the claim 1, wherein said thermoplastic resin is a low density polyethylene (LDPE).
3, according to the method in the claim 1, wherein said template Steam Heating.
4, according to the method in the claim 3, wherein said steam has the pressure of 100psi to 600psi.
5, according to the method in the claim 1, wherein before extruding thermoplastic resins molten mass process template, water flows through template surface and reaches 1 minute to 30 minutes.
6, be used to start the method for comminutor, it comprises:
(a) provide comminutor with inner heat insulation template;
(b) the low density polyethylene (LDPE) molten mass to 230 ℃ of heating in comminutor is to 300 ℃ temperature;
(c) with the temperature of the described template to 225 of Steam Heating to 260 ℃;
(d) before polyethylene extrusion molten mass process template, make water reach 1 minute to 30 minutes through template surface with 60 to 90 ℃ of temperature; With
(e) the polyethylene extrusion molten mass passes through template.
7, according to the method for claim 5, wherein said die plate temperature is 225 ℃, and the polyethylene melt temperature is 250 ℃, and water temperature is 75 ℃.
8, a kind of method that is used to stop and restarting thermoplastic resin pelletizer with inner heat insulation template, it comprises:
(a) stop the extruding thermoplastic resins molten mass through template;
(b) temperature flow that keeps water to use during extruding is crossed template surface, and this time is enough solidified the thermoplastic resin melt of at least a portion in pattern hole;
(c) thermoplastic resin melt in the comminutor is remained on the temperature of using during extruding;
(d) template is remained on the temperature of using during extruding;
(e) restart the extruding thermoplastic resins molten mass and pass through template.
9, the method in according to Claim 8, the water that wherein flows through template surface remains on Tm-20 ℃ to Tm-50 ℃ temperature, and wherein Tm is the melting transition temperature of the thermoplastic resin measured with ASTM D-3418.
10, the method in according to Claim 8, wherein the thermoplastic resin melt in comminutor remains on Tm+30 ℃ to Tm+200 ℃ temperature.
11, the method in according to Claim 8, wherein said template remains on Tm+50 ℃ to Tm+250 ℃ temperature.
12, the method in according to Claim 8, wherein said thermoplastic resin is a low density polyethylene (LDPE).
13, the method in according to Claim 8, wherein said template Steam Heating.
14, according to the method in the claim 13, wherein said steam has the pressure of 100psi to 600psi.
15, the method in according to Claim 8 wherein restarting the extruding thermoplastic resins molten mass through before the template, keeps water to flow through template surface 1 minute to 30 minutes.
16, the method in according to Claim 8, wherein said comminutor comprises that the thermoplastic resin that is used for extruding cuts into the rotatable blade of pill, and when stopping the extruding thermoplastic resins molten mass by template, blade keeps rotation.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US76236806P | 2006-01-26 | 2006-01-26 | |
| US60/762,368 | 2006-01-26 | ||
| US11/581,616 | 2006-10-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101336152A true CN101336152A (en) | 2008-12-31 |
Family
ID=40198299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006800517581A Pending CN101336152A (en) | 2006-01-26 | 2006-11-21 | Strat-up procedure for underwater pelletizer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101336152A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109715357A (en) * | 2016-09-13 | 2019-05-03 | Spc向日葵塑料复合有限责任公司 | For based on sunflower seed shell/sunflower seeds skin material manufacture biological plastics particle method |
-
2006
- 2006-11-21 CN CNA2006800517581A patent/CN101336152A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109715357A (en) * | 2016-09-13 | 2019-05-03 | Spc向日葵塑料复合有限责任公司 | For based on sunflower seed shell/sunflower seeds skin material manufacture biological plastics particle method |
| US11312040B2 (en) | 2016-09-13 | 2022-04-26 | Spc Sunflower Plastic Compound Gmbh | Method of producing a bioplastic granulate based on sunflower seed shells/sunflower seed hull material on the one hand and a plastic material on the other hand |
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Open date: 20081231 |