Pps Injection Molding Problems

Introduction Pps Injection Molding Problems Processing Methods Processing Characteristics The PPS provided by the resin manufacturer is of relatively low quality (4000~5000) and high crystallinity (75%)

Pps Injection Molding Problems

Processing method Processing characteristics The PPS provided by the resin manufacturer is a white powder with relatively low quality (4000 ~ 5000) and high crystallinity (75%). This pure PPS cannot be directly plasticized and can only be used for spraying. PPS used for plastic molding must be cross-linked and modified to increase the viscosity of the melt. Generally, it is appropriate for the melting index after cross-linking to reach 10~20; the melting index of glass fiber reinforced PPS can be larger, but it cannot be greater than 200. There are two cross-linking methods for PPS: thermal cross-linking and chemical cross-linking, with thermal cross-linking being the main method. The curing temperature of thermal curing is 150-350°C. Crosslinking will not occur below 150°C and high crosslinking will occur above 350°C, which qui will cause processing difficulties. Chemical crosslinking requires the addition of crosslinking accelerators. Specific varieties include zinc oxide, lead oxide, magnesium oxide, cobalt oxide, etc., as well as phenolic compounds, hexamethoxymethylmelamide, hydrogen peroxide, alkali metals or alkaline earth. hypochlorite, etc. Although PPS is cross-linked, its fluidity does not decrease much; therefore, waste can be reused three times; PPS itself has releasing properties, so there is no need to add a releasing agent. PPS can increase crystallinity and thermal deformation; temperature after heat treatment and post-treatment. The conditions are: temperature 204°C, duration 30 minutes. Other methods (1) Injection molding: A general injection molding machine can be used, and the melt index of glass fiber reinforced PPS is prreference of 50. The process conditions for injection molding are: barrel temperature, pure PPS is 280~330℃, 40% GFPPS mold temperature is 300~350℃; ℃; Injection molding pressure, 50-130MPA. (2) Extrusion: using a ventilated extruder, the process is as follows: the temperature of the feeding section is below 200°C; barrel temperature is 300-340°C, connection body temperature is 320-340°C; and the die temperature is 300 to 320°C. (3) Molding: suitable for large size products, using two compressions, cooling first and then hot pressing. The preheating temperature of hot pressing is about 360℃ for 15 minutes for pure PPS and about 380℃ for 20 minutes for GFPPS; the molding pressure is 10~30Mpa and it is cooled to 150℃ for demolding. (4) Spray training: the spray methodsuspended spray and dry powder thermal spray mixing method are used to spray PPS on the metal surface, and then undergo plasticizing and quenching treatment to obtain the coating at the coating processing temperature of the PPS; is 300°C Above, keep warm for 30 minutes. Application of PPS: When using nylon (PA), polyoxymethylene (POM), polyethylene terephthalate (PET) and polysulfone (PSU) in various fields of machinery industry, they all have defects and do not cannot meet the technical requirements of polyimide (PI). polyetheretherketone (PEEK) and polyamide-imide (PAI) are too expensive. PPS should be the ideal engineering plastic. 1. Machinery industry: In the machinery industry, it is particularly used in the preparation of components in high humidity and highly corrosive environments. Usedfor housings, structural parts, wear-resistant parts and sealing materials, including: pump housing, pump impellers, valves, bearings, bearing supports, piston rings and gears, pulleys, fans , flow meter components, flanges, universal heads, meters, levels, etc. 2. Electronic devices: PPS can account for 30% of the usage in electronic and electrical industry. It is suitable for high temperature electrical components with ambient temperature above 200°C. It can be used to make electric heaters; heater supports, starter coils, etc. on generators and motors. Shields and blades, etc. in televisions, can be used for high voltage shells and sockets, terminal blocks and terminal blocks in electronics industry, transformer manufacturing, choke coils; and skeletons and relay shells, supports of integrated circuits; using high frequency performance, manufacturing class H winding frames and adjustable capacitors, etc. Microelectronic component packaging, connectors, wiring connectors, sockets, coil bobbins, motor housings, electromagnetic adjustment disks, high frequency TV head shafts, relays, adjustment capacitors, fuse holders, tape recorders, magnetic therapy devices and other components. Also used in precision instruments: computers, timers, tachometers, photocopiers, cameras, temperature sensors, and the housings and components of various measuring instruments. 3. Automobile industry: PPS is used in the automobile industry about 45%, mainly in automobile functional parts; reflectors and lamp sockets. It can replace metal to make exhaust pipe circulation valves, turbinese water pumps, pneumatic signal regulators, etc. 4. Household appliances: coverings and protective parts for hot air dryers, curling irons, hair dryers, hair irons, microwave ovens, coffee makers, clothes dryers, electric irons, rice cookers, etc. . 5. Chemical industry: PPS has excellent adhesion and corrosion resistance and is extremely suitable for coating chemical equipment. 4. Material drying process temperature: 100 ~ 105 ℃ Duration: 3 hours 2. Injection molding process 1) Mold temperature: 60-80 ℃ 2) Barrel temperature: Front section: 220 ~ 260 ℃ Middle section : 290 ~ 310 ℃ Rear section: 300 ~ 320 ℃ Nozzle: 290 ~ 300 ℃ 3) Injection pressure: 60 ~ 70Mpa 4) Injection speed: medium speed 5) Injection time: Determined according to size of the room. It is best if the part fills the mold and the. the surface is essentially cooled and finalized

High pressure fog cannon truck

Also known as environmentally friendly fog cannon truck, "haze reduction artifact", etc., it uses high pressure to atomize water into water mist particles the size of dust particles (50~200 microns) and is ejected from the cannon-shaped air duct. The wind is strong and the range is wide. Dust condenses and settles on contact with water. Haze particles into the air, thereby achieving the purpose of removing dust and purifying the air.

There are many types of high-pressure fog cannon trucks on the market, which are mainly divided into two categories: mobile fog cannon trucks and fixed fog cannon trucks.

Mobile fog cannon trucks are divided into two types: vehicle-mounted and trailer-mounted. They have good maneuverability and are not subject to dhe geographic constraints. They are also called dust collection spray trucks. Compared with traditional watering trucks, fog cannon trucks can save water resources, purify air and suppress dust more effectively.

Fixed fog cannon trucks are attached to ground or raised metal structure platforms and rely on their own reach and steering capabilities to spray.

Scope of use of high-pressure fog cannon trucks

High-pressure fog cannon trucks are used to spray pesticides on crops, forests, pastures, etc. to combat pests and diseases; are also used in areas with relatively large dust, such as coal yards and it is used in steel mills, mines, docks, construction sites and other places, it est also used for sterilization, deodorization, cooling, epidemic prevention, etc. landfills or after disasters. Dust pollution of the atmosphere and people's living environment considerably improved.

  • Popular Focus
  • Where is the cheapest battery wholesale?

    Where is the cheapest battery wholesale in Tangxia, Sanyuanli, Baiyun District? There is an enterprise specializing in the independent production of electric vehicles in Tangxia, Sanyuanli, Baiyun District, Baiyun Sanyuanli Avenue, Baiyun Sanyuanli Street
    08-02
  • Four 3.7V lithium batteries in series and parallel produce 7.4V/4.4A. How to reduce it to 4.8V/4.4A?

    Four 3.7V lithium batteries in series and parallel produce 7.4V/4.4A. I personally think it is impossible to reduce it to 4.8V/4.4A. Because the discharge platform of lithium batteries is generally set
    08-10
  • What are the materials of the negative electrodes of lithium batteries?

    What are the materials of the negative electrodes of lithium batteries? The main commercial applications of lithium batteries include graphite, which is a sheet of copper used to guide current and which does not react. another safe
    08-02
  • The difference between 18500 and 26500 batteries

    What is the difference between 18500 and 26500 batteries? The answer above is 18650. The person asking the question should ask what is the difference between 18505 and 26500 batteries. In the case of Fuant ER1
    08-02
  • What does 3.7V 80mAh written on a lithium battery mean?

    What does 3.7V 80mAh written on a lithium battery mean? 3.7 V, 80 mA = 0.08 A, H means 1 hour, or 3600 seconds. Taken together, it is
    08-02
  • How long does a lithium battery (cell phone battery) last?

    How long does a lithium battery (cell phone battery) last? The lifespan of mobile phone batteries, under normal conditions of use and without serious impact, the lifespan set by the manufacturer must be 5 years.
    08-02
  • Will lithium batteries explode when charging?

    Will lithium batteries explode when charged? Will lithium batteries explode when charged? Lithium battery explosions usually occur during the charging process, because the negative electrode material of lithium batteries is graphite or other carbon materi
    08-02
  • Parameters of lgdas31865 lithium battery

    Parameters of lgdas31865 lithium battery The parameters of lgdas31865 lithium battery are as follows: LGDAS31865 is a model 18650 lithium battery with a capacity of
    08-02
  • What are the main components of lithium battery electrolyte?

    What are the main components of lithium battery electrolyte? The composition of lithium battery electrolyte is shown below. 1. Ethylene carbonate: molecular formula C3H4O3. Colorless transparent liquid (>35℃), room temperature
    08-02
  • Who are the lithium battery manufacturers in Shandong?

    What are the lithium battery manufacturers in Shandong? Shandong Shengyang Power Supply Co., Ltd. and Shandong Weineng Environmental Protection Power Technology Co., Ltd. 1. Shandong Shengyang Power Supply Co., Ltd. is located in Shengyang, Qufu City.
    08-02
  • Types of drone batteries available in 2024

    Part 1. Types of drone batteries available in 2024In 2024, drone batteries have advanced significantly, offering a range of options to cater to various needs in
    07-30
  • How long does it take to charge 26650 battery?

    How long does it take to charge a 26650 battery? The charging time for a 26650 battery is generally between 3 and 6 hours, but the precise time depends on the power of the charger and the capacity of the battery. in general
    08-02
  • For what?Sure, here's an article based on the phrase "For what?

    The simple yet profound question, "For what?" often serves as a gateway to deeper reflections on purpose and intention. It is a query that invites us to delve into the reasons behind actions, decisions, and circumstances that shape our lives and the wor
    08-02
  • Choosing the Right Cart Battery

    This comprehensive guide will walk you through everything you need about cart batteries, from understanding different types to making an informed purchase decision.
    08-02
  • 30mAh~500mAh 3.7 V Li-ion Battery

    Welcome to Ufine's collection of 3.7V lithium-ion batteries ranging from 30mAh to 500mAh. Explore a diverse range of compact and lightweight batteries suitable for various electronic devices,
    08-02
  • Here are 10 essential facts about drone batteries for 2024.

    10 Key Facts About Drone Battery for 2024 In 2024, drone batteries have advanced significantly, offering a range of options to cater to various needs in the consumer, commercial, and industrial sectors. Below are the primary types of drone batteries avai
    08-02
  • Could you please explain the difference among IMR, ICR, INR, and IFR 18650 batteries?

    What is the Difference Between IMR, ICR, INR, and IFR 18650 Battery?In 18650 batteries, discerning the differences among IMR, ICR, INR, and IFR types is fundamental for tailored and efficient battery usage. These distinct
    08-02
  • Safety considerations for cart batteries

    Selecting the ideal cart battery is crucial for ensuring optimal performance and longevity of your electric vehicle or vaping device. This comprehensive guide w
    08-01