긴 GF 함침 압출 라인

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.

긴 GF 함침 압출 라인

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.

원자재: 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.

펠릿화기

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

고객의 의견

Llc 트랜스 비즈니스 물류

우리 프로젝트에 대한 귀하의 지원에 감사드립니다. 계획을 세울 때 Cowin의 기술 연구 개발 팀은 우리가 선택할 수있는 다양한 계획을 참을성있게 계획하고 생산 중에 생산 진행 상황을 알려주고 장비가 공장으로 배송 된 후 전문 팀이 파견되어 장비를 설치 및 디버깅하고 직원을 교육했으며 이에 대해 매우 감사하며 다음 번에는 장기적인 협력을 기대합니다.

러시아

포레시아

Cowin 팀의 노고에 감사드립니다. 대규모 프로젝트로 인해 우리 회사는 중국에서 높은 비용 성능과 좋은 품질을 가진 공급 업체를 찾기를 희망하며 Cowin의 검사 후 설계 계획을 cowin에 전달했습니다. 몇 달 동안 디자인 팀의 노력 덕분에 프로젝트를 원활하게 수행 할 수 있으며 설치 및 디버깅 후 기계는 우리의 기대를 충족했으며 앞으로 더 많은 협력을 기대합니다.

프랑스

TPE 펠릿

우리는 정시에 기계를 받았습니다. COWIN의 애프터 세일즈 팀의 도움으로 설치 및 디버깅을 거쳐 생산에 투입되었으며 기계의 성능과 출력은 우리의 요구 사항에 부합합니다. 국경 간 무역은 쉽지 않지만 이번 협력을 통해 향후 중국 제조업체와의 협력에 대한 우리의 관심이 강화되었습니다. 프로젝트의 어려움에도 불구하고 Cowin은 좋은 태도를 가지고 있습니다.

터키

마스터배치

기계도 훌륭하고 서비스도 훌륭합니다. 여러분과 협력할 때마다 저희는 행복합니다. COVID의 영향으로 부품이 긴급히 필요한 상황에서도 충분한 예비 부품 재고를 제공하고 신속하게 제품을 배송해 주셔서 생산에 영향을 받지 않고 있습니다. 매우 감사하게 생각합니다. 저희에게는 시간이 곧 돈입니다.