PP Sheet Extrusion Line

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What is PP sheet extrusion line？

The PP sheet extrusion line is an automated production line specifically designed for the production of polypropylene (PP) plastic sheet. As a key upstream component of thermoforming machines (such as those producing lunch boxes and trays) and plastic cup making machines (such as those producing disposable coffee cups, milk tea cups, and yogurt cups), it provides high-quality, uniformly thick PP sheet raw material for downstream processing. Through high-temperature melting, extrusion molding, and precision cooling processes, this equipment transforms PP granules into thermoplastic-processable sheet for a wide range of applications, including food packaging, medical supplies, and consumer goods.

What can you do with it?

PP sheet extrusion lines can be configured to produce a variety of PP sheet types, widely used in packaging, food containers, medical devices, home appliances, stationery, and other industries. Specifically, the following sheet types can be produced:
1. Single-layer PP sheet:

Commonly used in food packaging, electronic product packaging, and stationery, it offers excellent transparency and low cost.
2. Multi-layer co-extruded PP sheet:

This sheet is typically used for demanding packaging applications, such as those requiring excellent airtightness, barrier properties, or UV resistance, and is suitable for pharmaceutical packaging and frozen food packaging.

3. Anti-static PP sheet:

Mainly used in static-sensitive applications such as electronic product packaging and CD packaging.

4. High-transparency PP sheet:

With its high transparency, it is commonly used in high-end food and cosmetic packaging, enhancing the product's visual appeal.
5. UV-resistant PP sheet:

Used in outdoor environments or applications exposed to sunlight for extended periods, such as flower pots and outdoor advertising.
6. PP non-woven sheet:

Produced through a specialized process, this sheet offers excellent breathability and is widely used in medical and healthcare product packaging. 7. PP Antimicrobial Sheet: Used in medical device packaging, food containers, and other fields, it exhibits certain antimicrobial properties.
The materials used in PP sheet extrusion lines can be adjusted based on market demand, creating sheets with specific functionalities such as fire resistance, sound insulation, noise reduction, and impact resistance.

Self-developed and mastering core technologies

Diverse screw design options

The use of precision screw design (single screw, twin screw, planetary screw, multi-layer co-extrusion solutions) and intelligent control systems can achieve a stable output of 800~1500kg/h, 24-hour uninterrupted operation, reducing downtime due to material changes, and is suitable for large-volume order needs.

High-Precision Intelligent Control

It adopts self-developed intelligent AI intelligent control system, with thickness deviation ≤±0.02mm, segmented intelligent temperature control module (±1℃ accuracy), equipped with melt pressure sensor, patented hanger-type die head (adjustable width 800-1500mm), 24-hour real-time monitoring of each section's operating data, and automatic adjustment of system preset parameters.

More Energy Efficient

The highly energy-efficient, one-to-one precise temperature control heating system intelligently adjusts to avoid overheating and maintains the optimal production temperature at all times. Equipped with a full servo system and heat recovery device, it reduces energy consumption by 30%, eliminates solvent volatilization, and complies with RoHS and REACH environmental regulations.

How it works (Complete sheet extrusion assembly and working principle)

A complete sheet extrusion line consists of eight key components, each of which performs a specific role while integrating seamlessly to achieve the quality requirements of sheet production.

PP sheet extrusion line component structure diagram

This integrated system combines precise material processing with intelligent process control to produce high-quality extruded sheets for various industrial applications. Each component operates in synchronized coordination to maintain continuous production while ensuring product consistency.

PP sheet extrusion vacuum feeding components

1.Vacuum feeding system

The vacuum feeding system is a key automated feeding equipment in the PP sheet extrusion production line. It uses the vacuum negative pressure principle to achieve efficient and clean transportation of PP (polypropylene) raw materials, ensuring a continuous supply of raw materials to the machine.

2. Extrusion Screw

The core component that plasticizes raw materials through controlled heating and mechanical shear.According to the different materials produced, it can be divided into single screw, twin screw and planetary combination screw.

3. Extrusion Mold

A precision system where plasticized material first passes through a screen changer (for impurity filtration), then through a metering pump for precise volumetric control, before being distributed via flow channels to the die for final sheet formation.

PP sheet extrusion three-roll calender assembly

4. Three-Roll Calender

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PP sheet extrusion silicone oil coating components

5. Silicone Coating Unit (Optional)

Applies a release agent layer for thermoforming applications (improving mold release) or functional coatings (like anti-static treatments). Often paired with the drying oven system.

6. Multi-stage oven

Typically configured with 2-4 heating zones (depending on material requirements) to rapidly dry coated sheets before winding. Ensures proper coating curing without affecting sheet properties.

PP sheet extrusion storage rack assembly

7. Accumulation Buffer

STemporarily stores sheets through adjustable web paths, preventing material damage or contamination during downstream equipment transitions or winding delays.

8. Winding Machine

Available in semi-automatic or fully automatic configurations to produce tightly wound, edge-aligned rolls. Ensures optimal material handling for storage and subsequent thermoforming processes.

Sheet extrusion production line working video

Comparison of four sheet extrusion solutions

Currently, there are four mainstream PET sheet extrusion technology solutions, including single-screw extruders, twin-screw extruders, planetary screw extruders, and multi-layer co-extrusion systems. The technical characteristics, advantages, and application scenarios of these solutions are described in this article. This article aims to provide a comprehensive reference for manufacturers to select the appropriate extrusion solution.

1. PP Single-Screw Sheet Extruder
This single-screw extruder conveys, melts, and homogenizes PP raw materials, then extrudes them through a flat-hanger die. This extruder offers a simple structure, low cost, and easy maintenance. It is suitable for low to medium production runs (100-500 kg/h) and general PP sheet materials (such as food packaging and stationery). While its mixing performance is average, there's significant room for improvement for highly filled or modified PP (such as flame-retardant and reinforced PP).

2. PP Twin-Screw Sheet Extruder (Co-rotating/Counter-rotating)
Co-rotating twin-screws: Provide strong shear forces and are suitable for highly filled, rPET, or modified PET (e.g., with added flame retardants or glass fiber). Counter-rotating twin-screws: Provide stable conveying and are suitable for high-viscosity PET.Twin-screw extruders use two parallel or interlocking screws to propel the material. They offer strong mixing and melting capabilities and are suitable for processing complex materials.

3. PP Planetary Screw Sheet Extruder
This equipment utilizes a combination of single and planetary screws. The rotation of the planetary screw helps improve the uniformity of material mixing. The multi-screw planetary design provides excellent mixing and plasticizing capabilities while minimizing the impact on the material's physical properties. Low extrusion temperatures reduce thermal degradation. Even with recycled materials, high-toughness sheets can be produced. This equipment is primarily used to produce high-end PP sheets.

4. PP Multi-Layer Coextrusion Solution
Multi-layer coextrusion, in simple terms, consists of a multi-layer structure. Common examples include two-layer, three-layer, and five-layer coextrusion. Multiple extrusion screws are required to achieve multi-layer coextrusion. Common combinations include:
* PP/PE-HIPS three-layer symmetrical structure: skin layer (PP/PE) - middle layer (HIPS) - skin layer (PP/PE). The skin layer is a blend of polypropylene (PPa, PPb, PPc) with different melt indexes and linear low-density polyethylene (LLDPE) to enhance impact resistance, abrasion resistance, and heat resistance. The middle layer is a blend of high-impact polystyrene (HIPS) with rubber and fillers to improve flexibility and dimensional stability, mitigating warping issues caused by the difference in thermal expansion coefficients between PP and HIPS.

* PP/PE/PA/EVOH multilayer barrier structure: PP or PE (outer layer) - adhesive layer - barrier layer (PA or EVOH) - adhesive layer - heat-seal layer (PE or CPP). Barrier layer: PA offers good oxygen barrier properties but needs to be laminated with a moisture barrier such as PE. EVOH offers excellent oxygen and water vapor barrier properties but should be avoided during high-temperature processing. Heat-seal layer: Cast polypropylene (CPP) or polyethylene (PE) offers good heat-seal properties.
* PP-based asymmetric structure: Heat-resistant PP (surface layer) - functional layer (such as HDPE or LLDPE) - heat-seal layer (EVA or LDPE). Surface layer: PP offers high-temperature resistance and is suitable for retort packaging. HDPE or LLDPE enhances low-temperature impact resistance. Heat-seal layer: Ethylene vinyl acetate copolymer (EVA) improves heat-seal properties.

* PP pearlescent film composite structure: BOPP pearlescent layer (containing calcium carbonate) - CPP or PE layer. The pearlescent layer: a microporous structure formed by biaxial stretching, lightweight and highly decorative. The inner layer: CPP or PE provides heat sealability and mechanical strength.
* Microlayer coextrusion technology (ultra-multilayer structure), alternating microlayers of PP and other polymers (such as PETG and PA) (up to thousands of layers), is primarily used in high-end electronic components, medical devices, and other applications requiring high barrier properties.
These structures are suitable for producing PP sheets requiring multiple layers or special properties, especially two-color or multi-color PP sheets, such as the popular hot pot bowls and ice cream cups, which require this multi-layer coextrusion technology.

Single screw PP sheet extrusion equipment parameters

Model	Adaptive material	Screw structure	Specifications(mm)	Thickness(mm)	Width(mm)	Extrusion Volume(kg/h)
SWT-120D	PET,PLA,PP,PS,PE,PC....	Single screw	φ120	0.15~2.0	≤1200	300~400
SWT-130D	PET,PLA,PP,PS,PE,PC....		φ130	0.15~2.0	≤1200	400~600
SWT-150D	PET,PLA,PP,PS,PE,PC....		φ150	0.15~2.0	≤1200	700~1000

Twin-screw PP sheet extrusion equipment parameters

Model	Adaptive material	Screw structure	Specifications(mm)	Thickness(mm)	Width(mm)	Extrusion Volume(kg/h)
SWT-75S	PET,PLA,PP,PS,PE,PC....	Twin screw	φ75	0.15~1.8	≤1200	400~500
SWT-85S	PET,PLA,PP,PS,PE,PC....		φ85	0.15~1.8	≤1200	500~700
SWT-95S	PET,PLA,PP,PS,PE,PC....		φ95	0.15~1.8	≤1200	800~1100

Planetary screw PP sheet extrusion equipment parameters

Model	Adaptive material	Screw structure	Specifications(mm)	Thickness(mm)	Width(mm)	Extrusion Volume(kg/h)
SWT-120X	PET,PLA,PP,PS,PE,PC....	Single screw + planetary screw (combination)	φ120	0.15~2.0	≤1200	300~400
SWT-130X	PET,PLA,PP,PS,PE,PC....		φ130	0.15~2.0	≤1200	500~700
SWT-150X	PET,PLA,PP,PS,PE,PC....		φ150	0.15~2.0	≤1200	700~1000

PP multi-layer co-extrusion equipment parameters

Model	Adaptive material	Screw structure	Specifications(mm)	Thickness(mm)	Width(mm)	Extrusion Volume(kg/h)
2-layer co-extrusion	PET,PLA,PP,PS,PE,PC....	Multi-screw (customized)	φ75+65	0.15~2.0	≤1200	500~600
3-layer co-extrusion	PET,PLA,PP,PS,PE,PC....		φ75+65	0.15~2.0	≤1200	600~800
5-layer co-extrusion	PET,PLA,PP,PS,PE,PC....		φ85+65+65	0.15~2.0	≤1200	900~1200

In what fields can it be applied?

Food industry

We can produce fast food boxes, plastic bowls and plates, biscuit boxes, pastry packaging boxes, fresh food trays, and fruit fresh-keeping boxes such as strawberries, blueberries, and cherries.

Medical industry

It can produce disposable syringe packaging, Tyvek packaging boxes, medical trays, pharmaceutical blister packaging, and medical device housings such as monitors and ventilators.

electronics industry

It can produce electronic pallets, as well as outer packaging and inner pallets for electronic products such as mobile phones, tablets, smart watches, Bluetooth headsets, game controllers, etc.

Cup making industry

We can produce coffee cups, milk tea cups, drinking cups, disposable dishes, milk cups, jelly cups, ice cream cups, disposable beverage cups, etc., as well as their matching cup lids.

automotive industry

Interior parts: instrument panel, door panel, roof, seat shell; exterior parts: bumper, fender, wheel arch, roof luggage box shell; functional parts: battery module shell, motor shell, ventilation duct, etc.

Packaging industry

It can produce cosmetic linings, gift boxes, wine packaging boxes, table and chair panels, cabinet decorative layers, advertising light boxes, as well as various packaging blisters for toothbrushes, toys, etc.

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