CN112026128A - Production process special for PPO (polyphenylene oxide) plate product - Google Patents
Production process special for PPO (polyphenylene oxide) plate product Download PDFInfo
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- CN112026128A CN112026128A CN202010853044.4A CN202010853044A CN112026128A CN 112026128 A CN112026128 A CN 112026128A CN 202010853044 A CN202010853044 A CN 202010853044A CN 112026128 A CN112026128 A CN 112026128A
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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
- 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
- B29C48/07—Flat, e.g. panels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B13/00—Conditioning or physical treatment of the material to be shaped
- B29B13/06—Conditioning or physical treatment of the material to be shaped by drying
- B29B13/065—Conditioning or physical treatment of the material to be shaped by drying of powder or pellets
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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
- 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
- B29C48/92—Measuring, controlling or regulating
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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
- B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
- B29C71/02—Thermal after-treatment
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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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2071/00—Use of polyethers, e.g. PEEK, i.e. polyether-etherketone or PEK, i.e. polyetherketone or derivatives thereof, as moulding material
- B29K2071/12—PPO, i.e. polyphenylene oxide; PPE, i.e. polyphenylene ether
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The invention provides a production process special for a PPO plate product, which comprises the following steps: drying; plasticizing and extruding, namely heating a machine barrel in three zones at a specific temperature and at a specific extrusion speed; molding/shaping, namely dividing a compression molding area into twelve areas for constant temperature, continuously cooling the molten material in a cooling and shaping area, and finally solidifying, crystallizing and shaping to be extruded; heat preservation heat treatment, namely, carrying out online heat preservation in three sections in front and back; and (5) cutting the plate. The invention can ensure that the PPO plate obtained by extrusion has stable appearance and compact structure, greatly improves the product percent of pass, and has excellent mechanical properties.
Description
Technical Field
The invention relates to a production process special for a PPO plate product.
Background
Unless specifically stated otherwise, what is described in this section is not prior art to the present application and is not admitted to be prior art by inclusion in this section.
PPO (Polyphenylene Oxide) is a high-strength engineering plastic. PPO has excellent mechanical strength, stress relaxation resistance, creep resistance, heat resistance and the like. However, PPO has poor melt flowability and is difficult to machine and mold. The PPO has high molecular bond rigidity, high glass transition temperature, difficult orientation, difficult relaxation after forced orientation and high residual internal stress in products.
The PPO plate forming process comprises the following steps: feeding, drying, plasticizing extrusion, molding and shaping, cutting into plates, chamfering, heat treatment and the like, wherein in the plasticizing extrusion process, a machine barrel needs to be heated, and in the molding and shaping process, the constant temperature needs to be kept.
At present, in the process of preparing a PPO plate, the plasticizing extrusion is divided into three areas to heat a machine barrel: first zone feeding section temperature: 265 ℃ and 270 ℃, and the temperature of the second-zone melting compression section: 260 ℃ to 275 ℃, three-zone homogenization zone temperature: 270 ℃ 275 ℃, joint temperature: 270 ℃ and 275 ℃, extrusion screw speed: 15-20 r/min.
And (3) keeping constant temperature in four zones during compression molding: temperature of the former zone: 270 ℃ and 265 ℃, and the temperature of the front two zones: 265-260 ℃ and the temperature of the latter zone: 255 ℃ and 260 ℃, and the temperature of the second zone: 250 ℃ and 255 ℃.
The heat treatment is divided into eight sections:
the first stage is set at 40 ℃ for 20 minutes;
the second section sets the constant temperature diameter (CM) 2 x 30 minutes at 135 ℃;
the third section sets the temperature to be 135 ℃ and reduces the temperature for 20 minutes;
setting the temperature at 100 ℃ for 180 minutes in the fourth stage;
in the fifth stage, the set temperature is 100 ℃, and the temperature reduction time is 20 minutes;
in the sixth stage, the constant temperature of 70 ℃ is set for 180 minutes;
the seventh stage is that the temperature is set to be 70 ℃ and is reduced for 20 minutes;
and in the eighth stage, the constant temperature of 40 ℃ is set for 180 minutes.
The PPO plate prepared by the process parameters has the defects of low production efficiency and insufficient mechanical property of the plate due to the fact that the structure is not compact enough, the qualified rate is low, and the PPO plate is easy to scrap.
Disclosure of Invention
In view of the above, it is necessary to provide a production process dedicated to PPO plate products to solve at least one of the above technical problems.
The invention provides a production process special for a PPO plate product, which comprises the following steps:
drying: drying the PPO plastic granules for 2-4h by circulating hot air at 80 ℃ to ensure that the water content is lower than 0.03%;
plasticizing and extruding: the PPO plastic raw material is converted into a uniform continuous melt with certain fluidity to be extruded under the action of the temperature of a machine barrel and an extrusion screw; wherein, divide into three district and heat to the barrel around:
the temperature of the feeding section in the first area is 260 ℃ to 265 ℃;
the temperature of the second-zone melting compression section is 265-270 ℃;
the temperature of the three-zone homogenizing section is 275-280 ℃;
the joint temperature is 275 ℃ and 280 ℃;
the extrusion speed of the extrusion screw is 8-10 r/min;
molding/shaping: the method is characterized in that a forming/shaping mold is adopted, the mold forms a mold cavity through assembling an upper mold, a middle plate and a lower mold, the mold is divided into a compression forming area and a cooling forming area, and a heat insulation groove is formed between the compression forming area and the cooling forming area. Under the rotary extrusion of the extrusion screw, the uniform melt with fluidity enters the die through the feed inlet of the die;
wherein, the compression molding of mould is divided into four district heats:
temperature of the former zone: 275 ℃ and 280 ℃;
temperature in the first two zones: 270 ℃ and 275 ℃;
temperature in the latter zone: 265 ℃ and 270 ℃;
temperature in the second zone: 260 ℃ and 265 ℃;
the cooling temperature of the cooling and shaping area of the die is 120-140 ℃;
online heat preservation: the front and the back are divided into three sections for online heat preservation, wherein the first zone is 100 ℃, the second zone is 95 ℃, and the third zone is 90 ℃;
cutting a plate: and cutting the formed plate into a preset length.
Further, the method also comprises a post heat treatment step after the plate cutting:
carrying out heat treatment on the stacked PPO plates, and dividing the PPO plates into twelve sections:
the first stage is set at 40 ℃ for 20 minutes;
the second stage is set with the temperature of 70 ℃ and the constant temperature time of 90 minutes;
the third section sets the temperature to be 70 ℃ and reduces the temperature for 20 minutes;
the fourth stage is that the temperature is set to be 100 ℃ and the constant temperature time is 90 minutes;
in the fifth stage, the set temperature is 100 ℃, and the temperature reduction time is 20 minutes;
in the sixth stage, the temperature is set to be 120 ℃ and the constant temperature time is 180 minutes;
the seventh stage is that the temperature is set to be 120 ℃ and is reduced for 20 minutes;
the eighth section sets the temperature to be 100 ℃ and the constant temperature time to be 180 minutes;
in the ninth stage, the constant temperature time is 20 minutes at the set temperature of 100 ℃;
the tenth section sets the temperature to be 70 ℃ and reduces the temperature for 180 minutes;
in the eleventh stage, the temperature is reduced for 20 minutes at the set temperature of 70 ℃;
and the twelfth section is set to have the temperature of 40 ℃ for 180 minutes.
Further, after the forming/shaping, the method further comprises the following steps:
braking: and the plate forms a certain pressure in the compression molding area through braking so as to adjust the tightness, thickness and eccentricity of the plate.
The process parameters set by the method are process parameters which are obtained through a large number of tests and are suitable for producing the PPO sheet material, and through the selection of the specific parameters, the PPO sheet material obtained through extrusion is stable in appearance, compact in structure, high in product percent of pass and excellent in various mechanical properties.
Drawings
Fig. 1 is a schematic structural view of a production apparatus according to an embodiment of the present invention.
Detailed Description
The production process special for the PPO plate product provided by the invention is used for producing the PPO plate product through the special production equipment for PPO shown in figure 1. As shown in fig. 1, the equipment comprises a motor 1, a reduction gearbox 2, a hopper 3, a dryer 4, a control cabinet 5, a screw 6, a flange joint 7, a material nozzle square plate 8, a mould 10, a mould frame 11, a heat preservation mould 12, a brake base 13, a cutting machine 14, an oven and the like.
The motor 1, the reduction gearbox 2, the hopper 3, the dryer 4, the control cabinet 5, the screw 6 and the like can form a main machine part of the equipment, and the screw 6 is arranged in a machine barrel.
The material nozzle square plate 8, the die 10, the die frame 11, the heat preservation die 12, the brake base 13, the cutting machine 14, the oven and the like can form an auxiliary part of the equipment.
The motor 1 and the reduction gearbox 2 form a rotating system, the motor 1 runs and drives the reduction gearbox 2 through belt transmission, and therefore the screw 6 keeps a certain shearing rate.
The machine cabinet can be internally provided with a control system, the control system can specifically comprise an electrical instrument and an actuating mechanism, and the main function of the control system is to control the main machine, so that the rotating speed and the power of the operation of the main machine are normal, the temperature, the pressure, the flow and the quality of products of the main machine and the auxiliary machine are ensured, and the automatic control of the whole machine set is realized.
The mold 10 may include an upper mold, a fan-shaped middle plate 9, and a lower mold. In this embodiment, the upper and lower dies are 1250 × 1000 × 120 steel plates, and the feed inlet position of the middle plate 12 is a fan angle of 135 degrees. The mold 10 includes a compression molding zone and a cooling and shaping zone, and the compression molding zone is located at the front end of the cooling and shaping zone. The compression molding zone is heated by a heating tube to control the temperature of the mold 10. And the compression molding area is connected with circulating cooling water to cool the mold 10, so that the product is molded and extruded out of the mold 10. The die 10 and the host machine are connected together through the flange joint 7, and molten materials enter the die 10 through the flange joint 7.
The water temperature machine for supplying the circulating cooling water is installed at the molding section of the upper and lower molds, and the molding water temperature is controlled by the circulating hot water, so that the product in the molding area is molded at a constant and balanced temperature and is smoothly extruded out of the mold 10.
The brake seat 13 mainly comprises a transmission device, a roller pressing device and a brake device, is arranged behind the die 10, and is used for controlling the upper and lower 3 pairs of rollers of the brake seat 13 to press the plate by air control, and the speed reducer drags the roller to enable the product to keep a certain pressure in a compression area and move forward at a constant speed.
The cutting machine 14 is a plate cutting device and is arranged behind the brake seat 13, the extruded product passes through the cutting plate supporting surface of the cutting machine 14, the plate is cut through the high-speed rotation of the saw blade, and the cut plate is cut into products with required lengths.
The oven is of a sealed box body structure, different temperatures are set through a temperature controller, heat treatment is carried out on the product at different time and in different sections, residual internal stress of the product is eliminated, and product quality and stability are guaranteed.
The production process special for the PPO plate product mainly comprises the following steps: feeding, drying, plasticizing and extruding, molding/shaping, braking, cutting into plates, stacking, heat treating and chamfering.
The following focuses on the specific process steps of one embodiment of the present invention.
1. Feeding: when feeding, should in time throw the material, guarantee hopper 3 not empty, prevent that the air from directly getting into dry circulating fan, influencing dry return air speed, different materials can not use in mixture, pay attention to the brand of branch clear material and the type of material, prevent that debris, miscellaneous material from getting into hopper 3, cause the feed opening to block up.
2. Drying: before extrusion molding, the PPO plastic granules are dried to remove moisture, otherwise, the moisture content exceeds a certain limit, and the moisture can volatilize into gas in an extruder barrel, so that air holes are contained in the product, and the strength of the product is reduced.
In the step, aiming at the characteristics of the PPO plastic granules, 80 ℃ circulating hot air is adopted to dry the PPO plastic granules, the drying time is 2-4H, the moisture content in the product is lower than 0.03%, and the 80 ℃ circulating hot air is adopted to dry the PPO plastic granules and simultaneously realize the preheating effect of the PPO plastic granules.
3. Plasticizing and extruding: the PPO plastic raw material is converted into a uniform continuous melt with certain fluidity by the temperature of a machine barrel and the action of an extrusion screw rod, and then is extruded.
Wherein, the barrel is heated by dividing the front zone and the rear zone into three zones, and the temperature of the feeding section in one zone is 260-265 ℃ (such as 261 ℃, 262 ℃, 263 ℃ and 264 ℃); the temperature of the second-zone melt compression section is 265 ℃ and 270 ℃ (such as 266 ℃, 267 ℃, 268 ℃ and 269 ℃); the three-zone homogenization zone temperature 275 ℃ 280 ℃ (e.g., 276 ℃, 277 ℃, 278 ℃, 279 ℃); the joints 275-280 deg.C (e.g., 276 deg.C, 277 deg.C, 278 deg.C, 279 deg.C), and the extrusion rate is 8-10r/min (e.g., 8r/min, 9r/min, 10 r/min).
Through selecting specific three-zone heating temperature, joint temperature and extrusion speed, the PPO plastic granules can be more completely plasticized, melted and extruded and molded, so that the PPO molten raw material is extruded at a reasonable speed to be matched with the subsequent specific molding/shaping temperature for molding/shaping, and the stress, air holes, mechanical properties and the like of the PPO plate product can be influenced by the setting of each parameter.
4. Molding/shaping: under the rotary extrusion of the extrusion screw, the fluid uniform melt enters the die through a die feed port (in this embodiment, a feed port provided on the middle plate 12), and is extruded out of the die 10 after being molded and shaped in the die according to a certain shape.
The mold 10 is divided into a compression molding area and a cooling shaping area, the first third of the mold 10 is the compression molding area, and the second third of the rear of the mold 10 is the shaping area.
The compression molding zone of the mold 10 is divided into twelve zones for constant temperature:
temperature of the former zone: 275 ℃ 280 ℃ (e.g., 276 ℃, 277 ℃, 278 ℃, 279 ℃);
temperature in the first two zones: 270 ℃ and 275 ℃ (e.g., 271 ℃, 272 ℃, 273 ℃, 274 ℃);
temperature in the latter zone: 265 ℃ 270 ℃ (e.g., 266 ℃, 267 ℃, 268 ℃, 269 ℃);
temperature in the second zone: 260 ℃ 265 ℃ (e.g., 261 ℃, 262 ℃, 263 ℃, 264 ℃);
the shaping region of the mold 10 continuously cools the melt and finally solidifies, crystallizes and shapes the melt and is extruded out of the mold 10. Both ends of the shaping area of the mold 10 are connected with cooling circulating water, and the temperature of the melting material is continuously reduced through the continuous circulation of cold water, wherein the temperature reduction temperature is 120-140 ℃.
And 3, adopting specific four-area forming temperature and combining with specific forming temperature to be matched with the fluidity temperature parameter in the step 3, ensuring that the bar product can be smoothly extruded, ensuring that the PPO plate is more compact after being extruded, and ensuring that the surface has no ripple and the inside has no layering phenomenon.
5. Online heat preservation: the temperature is kept in three sections in front and back, namely, the first zone is 100 ℃, the second zone is 95 ℃ and the third zone is 90 ℃. Three sections of specific temperatures are preliminarily adopted for on-line heat preservation and are matched with the forming/shaping temperature so as to achieve the purpose of eliminating part of internal stress in advance, and the internal stress is further eliminated during subsequent heat treatment.
4. Braking: the plate is clamped to form certain resistance by adjusting the tightness of the brake strip of the brake seat 13, and the molten raw materials form certain pressure in a compression area, so that the extruded product has a compact structure, and the thickness and the eccentricity of the plate can be adjusted by adjusting the tightness of the brake.
5. Cutting a plate: 1000MM length is measured by a measuring tape, and a plate cutting machine is started to cut out the required length.
6. Stacking: hoisting the plate by using a sucker to hoist the block, and neatly stacking the plate on a specific stacking frame; three stainless square steels are placed between the plates, the square steels between layers appearing preferably on top and bottom in a straight line.
7. And (3) post heat treatment: the PPO plates which are stacked and piled are subjected to heat treatment through an oven and are divided into eleven sections:
the first stage is set at 40 ℃ for 20 minutes;
the second stage is set with the temperature of 70 ℃ and the constant temperature time of 90 minutes;
the third section sets the temperature to be 70 ℃ and reduces the temperature for 20 minutes;
the fourth stage is that the temperature is set to be 100 ℃ and the constant temperature time is 90 minutes;
in the fifth stage, the set temperature is 100 ℃, and the temperature reduction time is 20 minutes;
in the sixth stage, the temperature is set to be 120 ℃ and the constant temperature time is 180 minutes;
the seventh stage is that the temperature is set to be 120 ℃ and is reduced for 20 minutes;
the eighth section sets the temperature to be 100 ℃ and the constant temperature time to be 180 minutes;
in the ninth stage, the constant temperature time is 20 minutes at the set temperature of 100 ℃;
the tenth section sets the temperature to be 70 ℃ and reduces the temperature for 180 minutes;
in the eleventh stage, the temperature is reduced for 20 minutes at the set temperature of 70 ℃;
and the twelfth section is set to have the temperature of 40 ℃ for 180 minutes.
Through the specific later-stage heat treatment steps, specific temperature heat treatment is carried out on the PPO plate product in specific time and multiple sections, and the heat preservation result of the online heat preservation step is combined, so that the residual internal stress of the PPO plate product can be effectively eliminated, the quality and the stability of the PPO plate are ensured, and the PPO plate cannot warp or deform in the processing process.
8. Chamfering: each edge of the plate is chamfered, so that the product is more attractive, and fingers can be prevented from being cut by the diamond edge of the plate in the carrying process.
The PPO plate is tested, and the test items and results are as follows:
| item | Standard of merit | Unit of | Numerical value |
| Density of | ASTMD792 | g/cm3 | 1.23 |
| Tensile strength at yield | ASTMD638 | Mpa | 58 |
| Elongation at break | ASTMD638 | ％ | 30 |
| Bending strength | ASTM790 | Mpa | 90 |
| Flexural modulus | ASTM790 | Mpa | 2420 |
| Shore hardness | ASTMD2240 | D | 82 |
The parameters are particularly empirical parameters which are interdependent but not isolated, the selection of the parameters is very important, the parameters are matched together to finally obtain the expected PPO plate, and the PPO plate prepared by the specific steps of the process method has stable appearance, compact structure, excellent mechanical property and greatly improved product percent of pass.
Claims (3)
1. A production process special for PPO plate products is characterized by comprising the following steps:
drying: drying the PPO plastic granules for 2-4h by circulating hot air at 80 ℃ to ensure that the water content is lower than 0.03%;
plasticizing and extruding: the PPO plastic raw material is converted into a uniform continuous melt with certain fluidity to be extruded under the action of the temperature of a machine barrel and an extrusion screw; wherein, divide into three district and heat to the barrel around:
the temperature of the feeding section in the first area is 260 ℃ to 265 ℃;
the temperature of the second-zone melting compression section is 265-270 ℃;
the temperature of the three-zone homogenizing section is 275-280 ℃;
the joint temperature is 275 ℃ and 280 ℃;
the extrusion speed of the extrusion screw is 8-10 r/min;
molding/shaping: the method is characterized in that a forming/shaping mold is adopted, the mold forms a mold cavity through assembling an upper mold, a middle plate and a lower mold, the mold is divided into a compression forming area and a cooling forming area, and a heat insulation groove is formed between the compression forming area and the cooling forming area. Under the rotary extrusion of the extrusion screw, the uniform melt with fluidity enters the die through the feed inlet of the die;
wherein, the compression molding of mould is divided into four district heats:
temperature of the former zone: 275 ℃ and 280 ℃;
temperature in the first two zones: 270 ℃ and 275 ℃;
temperature in the latter zone: 265 ℃ and 270 ℃;
temperature in the second zone: 260 ℃ and 265 ℃;
the cooling temperature of the cooling and shaping area of the die is 120-140 ℃;
online heat preservation: the front and the back are divided into three sections for online heat preservation, wherein the first zone is 100 ℃, the second zone is 95 ℃, and the third zone is 90 ℃;
cutting a plate: and cutting the formed plate into a preset length.
2. The production process of the PPO plastic plate as claimed in claim 1, further comprising a post heat treatment step after the plate cutting:
carrying out heat treatment on the stacked PPO plates, and dividing the PPO plates into twelve sections:
the first stage is set at 40 ℃ for 20 minutes;
the second stage is set with the temperature of 70 ℃ and the constant temperature time of 90 minutes;
the third section sets the temperature to be 70 ℃ and reduces the temperature for 20 minutes;
the fourth stage is that the temperature is set to be 100 ℃ and the constant temperature time is 90 minutes;
in the fifth stage, the set temperature is 100 ℃, and the temperature reduction time is 20 minutes;
in the sixth stage, the temperature is set to be 120 ℃ and the constant temperature time is 180 minutes;
the seventh stage is that the temperature is set to be 120 ℃ and is reduced for 20 minutes;
the eighth section sets the temperature to be 100 ℃ and the constant temperature time to be 180 minutes;
in the ninth stage, the constant temperature time is 20 minutes at the set temperature of 100 ℃;
the tenth section sets the temperature to be 70 ℃ and reduces the temperature for 180 minutes;
the eleventh section is set at the temperature of 70 ℃ for 20 minutes;
and in the twelfth stage, the temperature is set to be 40 ℃ and is reduced for 180 minutes.
3. The production process dedicated to PPO plate products as claimed in claim 1 or 2, further comprising, after said shaping/setting:
braking: and the plate forms a certain pressure in the compression molding area through braking so as to adjust the tightness, thickness and eccentricity of the plate.
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| CN202010853044.4A CN112026128A (en) | 2020-08-22 | 2020-08-22 | Production process special for PPO (polyphenylene oxide) plate product |
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| CN202010853044.4A CN112026128A (en) | 2020-08-22 | 2020-08-22 | Production process special for PPO (polyphenylene oxide) plate product |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116728691A (en) * | 2023-06-16 | 2023-09-12 | 河北优尼科塑胶制造有限公司 | Polycarbonate board system of processing |
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