PP PS Sheet Extrusion Line

In the current market, the PP PS sheet extrusion line is mainly based on single-screw models, and the equipment cost is much lower than that of twin-screw models. China Plastic Extruder manufacturer- GWELL, a single-screw model of PP PS Sheet Extrusion Line, stable feeding under various formulas, and good plasticizing properties of raw materials, which not only ensures the toughness of the sheet but also avoids the later thermoforming of the sheet. Cracked, uneven color.

China PP PS sheet extrusion line twin-screw model, although the cost is higher, other aspects are excellent compared to single-screw. With the twin screw, the design flexibility of its thread structure is more flexible, which ensures the feeding of the extruder, and at the same time makes the formula material have better dispersion in the barrel, and the sheet will be more uniform.

PP/PS sheet extrusion line is common for single-extruder single-layer sheet extrusion line and double-extruder co-extrusion three-layer sheet extrusion line. There is also a multi-extruder co-extrusion multi-layer extrusion line, which can process 7-9 layers of the composite sheet at most, such as a high-barrier EVOH multi-layer co-extrusion extrusion line. This type of extrusion line can process PP, PS, PE, and other polyolefin materials.

Introduction of PP PS sheet extrusion line

• PP sheet

PP sheet is made of PP (polypropylene) resin through extrusion, calendering, trimming and other processes.

PP sheet has the characteristics of lightweight, bright and stable surface, good heat resistance, high mechanical strength, excellent chemical stability, electrical insulation and non-toxicity. After thermoforming, it can be made into drinking cups, food boxes and other daily necessities.

• PS table

PS (polystyrene) sheet is a new type of environmentally friendly packaging material developed in recent years. With its excellent thermoforming performance, good protection performance, environmental protection performance and hygienic performance, it is widely used in blister packaging of medicine, food, toys, electronics and clothing.

main feature:

• Low static electricity generation, suitable for packaging products with low static electricity requirements.
• Easy to vacuum form, the product has good impact resistance.
• It has good hygienic properties and can come into direct contact with food without harm or benefit.
• Easy to color, can be made into different colors of materials, produced into different colors of vacuum cover.
• Good hardness, this kind of plate is better than other plates of the same thickness. Thermoformed cups can be used as hot and cold beverage cups.
• PP PS sheet extrusion line products meet environmental protection requirements and can be recycled. When its waste is incinerated, it will not produce harmful substances that harm the environment.

PP PS Sheet Extrusion Line Process Flows

Extruder —- Screen changer —– Melt pump —– T-die —— Calender —– Cooling bracket —– Haul-off—- Winder

Gwell PP PS sheet extrusion line

Multi-extruder co-extrusion technology is adopted to produce multi-layer co-extrusion composite PP and PS sheets, such as ABA, ABCBA, ABCDCBA, and other multi-layer structure, which is widely used in heat forming, printing, hardware packaging, electronic tray, flocking, food, clothing, tools, toys, stationery pieces, decorative pieces and so on.

• equipped with the precise distributor, evenly layered, the adjustable proportion of each layer, digital precise control.
• inclined horizontal structure, easy to operate and maintain.
• roller independent power, linear speed, and extruder speed synchronous closed-loop control.
• the whole machine adopts PLC control to realize automatic control of parameter setting, data operation, feedback, alarm, and other functions.
• Gwell independently wrote the electronic control operating system.
• PP PS sheet extrusion line screw adopts specially designed mixing and plasticizing function.
•  Hanger type die head, double throttle valve design, can accurately adjust the thickness of the plate.
• Sheet thickness is adjusted by screw and pressing roller.
• Separating roller temperature control system to make the thickness of the plate uniform.
• PP PS sheet extrusion line winder adopts large torque motor to adjust speed and tension.
• Automatic measuring device can preset product length.

PP PS sheet extrusion line main components

• Single extruder
• Screen changer
• Melt pump
• Three-roll calender
• Cooling conveyor
• Trimming unit
• Crimping machine
• Take off
• Winding machine

Type of extrusion

PP PS sheet single-screw venting or not extrusion line

There are two kinds of PP/PS single-screw extrusion line venting or not.

One of the keys that finished sheet crystal point has or not is moisture content. Extrusion line with venting+drying, venting or both not, Moisture content ranking will be venting+drying<venting<both not.

Choose which type of single-screw extrusion line, which the important point is the raw material moisture. China Gwell needs customer requirements, finished product net width、thickness、output capacity, etc and conditions, used raw material、factory condition, so that design for our customers.

PP PS sheet twin-crew venting extrusion line

Twin-screw extruder is more suitable for kinds of raw material, no matter what the form of materials. So if customers doesn’t make sure the type of the raw material or later want to change different types of the PP/PS raw material.

We will introduce the twin-screw PP/PS sheet extrusion line. And moreover, China Gwell

GWELL as China Plastic Extruder manufacturer designed the twin-screw extruder that has the advantages of lower power and high capacity. It can improve the profit for customers.

Extrusion type

Mono extruded to make a single-layer PP/PS sheet, this is a simple and normal PP/PS sheet. Gwell will provide the specification according to the used raw material.

Co-extruded to make a Three-layer pet sheet or multi-layer PP/PS sheet, like the three-layer sheet, which is composed of PP/PS+CaCo3+PP/PS. It can decrease the cost but also environmental. Multi-layer like PP PS EVOH sheet extrusion line, this kind of machine for high barrier packaging.like Jelly, cheese, medical packing, etc.

Main applications of PP PS sheet

• PP/PS blister sheet
• PP/PS single-layer sheet, PP/PS co-extruded two-color sheet, PP double-sided high-transparency sheet, etc. Sheet used in the blister packaging industry.
• PP stationery sheet
• PP transparent sheet, frosted sheet (coarse sand, fine sand), two-color sheet used in stationery packaging industry sheet.
• PP foam sheet, PP foam sheet has unique advantages, PP foam sheet with a density of over 0.45g/m3 has good bending resilience, not easy to deformation, so it has a broad prospect in the field of folders; PP foam sheet with a density of 0.6g/m3 has good mechanical properties and has a very broad future in the field of automobile interior decoration. It can be processed into carpet support materials, shade board, sound insulation board, luggage rack, interior decoration, cover, box, etc. PP foam sheet with the density of 0.3g/m3 has good flexibility and resilience, suitable for packaging, partition board and other fields.

Whether single-screw or twin-screw PP PS sheet extrusion lines, there are designs for PP and PS production. The length-diameter ratio of the single screw has been lengthened, and the vacuum exhaust has been increased; for the twin-screw model, China Plastic Extruder manufacturer – GWELL has developed and designed a vacuum system suitable for the twin-screw main engine to ensure that the moisture of the material is fully discharged, thereby ensuring the PP PS sheet. performance.