ロングGF含浸押出ライン

Long Glass Fiber Reinforced Thermoplastic Composites Impregnation Extrusion Line

Long GF(Glass Fiber) Impregnation Extrusion Line (LFRT Extrusion Line)

Long glass fiber reinforced thermoplastic composites impregnation extrusion is superior to the traditional thermoplastic glass fiber reinforced production process. It is not simply coating fiber tows with polymer, inside impregnation mould individual filaments in the fiber tows are spread apart so each is encapsulated with thermoplastic polymer. The reinforced plastics produced by the long glass fiber impregnation extrusion process have better properties.

ロングGF含浸押出ライン

Long-fiber Reinforced Thermoplastic (LFRT), the length of the glass fiber is bigger than 3mm, while the commercialized LFRT is normally 6-25mm.

Compared with common short glass fiber reinforced plastics, the flexural modulus of long glass fiber reinforced plastics has been increased by 2 times, the impact strength has been increased by 4 times, and it can remain unchanged at -30℃.

The excellent properties are as follows:

Non-orientation gridding structure enables it can keep the original property even in high/low temperature and high frequency environment.
Excellent anti-impact, high modulus, high strength, low warping, and similar thermal expansion factor to metal.
Low shrinkage, low creep deformation, and high dimensional stability.
Excellent anti-wear and endurance.
Excellent anti-chemical.
Excellent processing: high flow, easy demould, low damage to the screw.

Application fields: automobiles, home appliances, high-speed train, etc.

原材料: PP/PA+GF

The melt flow rate (MFR) of the resin is required to be above 40 (80-100 is recommended). The higher the MFR, the thinner the material and the better its fluidity.
Glass fiber with a specification of 2400 TEX and an internal draw structure is used, and Owens Corning (OC) Grade 4849 is recommended.)

Technical field: engineering plastic processing

Machine Model: chosen as per the customer’s target production capacity(kg/h)

Extruder L/D: 40 is recommended

Screw speed: 600rpm

Screw material: W6Mo5Cr4V2 (wear resistance)

Barrel material: bimetallic structure, 45# steel outer shell and integrated-type α101 liner (wear resistance)

Process flow: (refer to the below figure)

The resin and additives are pre-mixed in a high-speed mixer and then added through the main feeding port. The glass fibers are flattened on the preheating flattening device and wrapped by the resin in the dipping mould, and then pulled to the pelletizer for granulation.

Key configuration

Feeding method

If a gravimetric dosing system is adopted, at least two gravimetric feeding scales are required for resin and additives.
The additives can be pre-mixed in a high-speed mixer before being dosed by the gravimetric feeder.

Fiber-discharge frames

Draw the fiber yarns by means of rotational untwisting.
The number of yarns is usually 24/36/48/72, so all frames with two rows of workstations, facilitating the connection of the next bundle of yarn.
The gap between the two yarns should be maintained at 10-15mm (12mm is more common), to prevent the two yarns from getting tangled together.

Preheating flattening device

Made of smooth and wear-resistant material (hard chrome plated and mirror polished), with heating function, and the temperature ranges from 150℃ to 180℃ (to destroy the sizing agent on the glass fiber’s surface and preheat it simultaneously for better dipping effect).
Adjust the fiber tension by adjusting the opening and closing angle of the tension roller (with adjustable tension by electric opening and closing).

Dipping mould

The temperature of the dipping mould during operation will be approximately 20-30℃ higher than the melting point of the resin.
The dipping mould contains a melt distribution mould, which can spread the resin out for easy dipping.
The dipping mould is normally equipped with three die heads of different hole diameter specifications, corresponding to finished products with different glass fiber contents (30%, 40%, and 50%; the higher the glass fiber content, the smaller the hole diameter). Therefore, it is necessary to confirm the glass fiber content with the customer and configure the required die head accordingly. (maximum content of glass fiber can reach 60%.)
When the raw material is PA (polyamide), nitrogen protection should be applied at the glass fiber inlet of the dipping mold to prevent the material from oxidizing and turning yellow.
The mould has two opening methods: electric or hydraulic. This makes it convenient to open for cleaning.

Puller

The normal traction speed of glass fiber is 10-20 m/min. When the speed is too high up to 20-25 m/min, the dipping effect will be poor.
All equipment with tension (i.e., where the yarn passes through) need to be fixed to the ground with expansion bolts to prevent the machine from tipping over due to the traction force.

Pelletizer

The length of the finished pellets is adjustable between 6-15 mm. Two motors of the dual-frequency conversion pelletizer control the traction roller and the moving blades, respectively. Adjust the motor frequency (Hz) of the pelletizer’s moving blades to achieve non-fixed length cutting. The knife requires high wear resistance (welded by hard alloy).

Cooling bath

Consists of two parts: water spraying (equipped with a shaping frame and temperature control, spraying ice water) and air drying. A water pump and a heat exchanger are installed under the water trough, and the heat exchanger is connected to a chiller.

Optional items

Equipment used in the engineering plastics field may be multi-purpose, producing LFT pellets while manufacturing compound masterbatches. In this case, additional auxiliary machinesare required: twin screw side feeder, strand die head, screen changer, single-frequency conversion pelletizer, and a vibrating sieve, etc.
If a silo is required, a pneumatic conveying silo (equipped with an interlayer for noise reduction) should be used instead of a homogenizing silo. This is because glass fiber materials are not suitable for stirring, and stirring will generate dust.

LFT process of resin + chemical fiber/special fiber

The process flow is the same as that of LFT-G.
The fiber selected is the external-draw type 2400 TEX, Grade OC4849.
The melting point of the resin should be lower than that of the fiber; otherwise, the fiber will melt, resulting in dipping

お客様の声

Llc Trans Business Logistics

Thank you for your support to our project. At the beginning of making the plan, the technical research and development team of Cowin patiently planned different plans for us to choose.During the production, keep us informed of the production progress.After the equipment was shipped to our factory, a professional team was dispatched to install and debug the equipment and train our staff.We are very grateful for this and look forward to our long-term cooperation next time.

Russia

フォーレシア

Cowinチームの努力に感謝します。大規模なプロジェクトのため、弊社は中国でコストパフォーマンスが高く、品質の良いサプライヤーを見つけることを望んでいます。Cowinの検査の後、弊社は設計計画をCowinに伝えました。Cowinの検査後、設計案をCowinに伝えました。設計チームの数ヶ月間の努力のおかげで、プロジェクトはスムーズに実施することができました。設置、デバッグ後、機械は私たちの期待に応えてくれて、今後のさらなる協力を期待しています。.

フランス

TPEペレット

機械は予定通り納品されました。COWINのアフターセールスチームの助けを借りて、設置・デバッグ・生産投入が完了し、機械の性能・生産量は当社の要求を満たしています。越境貿易は容易ではありませんが、今回の協力により、今後中国のメーカーと協力することへの関心が一層高まりました。プロジェクトには困難もありましたが、Cowin社の態度は良好でした。.

トルコ

Masterbatch

Your machine is great and the service is nice. Every time we cooperate with you, we are happy. Even under the influence of COVID, when we urgently need parts, our production is not affected, because you have provided us with sufficient spare parts inventory and delivered goods quickly. We are very grateful. For us, time is money.