Was ist eine PP-Kunststoffplatte?
Polypropylene (PP) plastic sheet, commonly referred to as PP sheet, is a semi-crystalline thermoplastic material. Compared to polyethylene (PE) sheets, PP sheets are significantly harder and have a higher melting point. However, homopolymer PP becomes brittle above 0°C, so most commercial-grade PP materials are modified with 1-4% ethylene random copolymer or higher ethylene content block copolymers. These copolymerized PP sheets have lower heat distortion temperature (~100°C), reduced transparency, gloss, and stiffness but exhibit much higher impact resistance.
The material offers excellent chemical resistance, electrical insulation, and lightweight properties, making it ideal for a wide range of industrial and environmental applications. PP sheets are also valued for their ease of processing and cost efficiency, with variants tailored through additives to improve rigidity, heat resistance, and dimensional stability.
PP Sheet Specifications
| Specification | Details |
|---|---|
| Dickenbereich | 0.5 - 100 mm |
| Maximum Width | Up to 2000 mm |
| Length Range | 100 - 10,000 mm (customizable) |
| Recommended Standard Sizes | 1500×3000 mm, 1220×2440 mm, 1000×2000 mm |
| Modified PP Sheets (Calcium-filled) | Thickness: 2-30 mm Colors: Green, White, Beige Good dimensional stability, improved rigidity and heat resistance; mainly used for water tanks, three-phase separators |
| Custom Sizes | Widths up to 2000 mm, any length |
PP Sheet Welding
The most common welding method for PP sheets is hot air welding. For optimal weld strength, welding rods made from the same material as the base sheet should be used. The hot air temperature typically ranges from the melting point plus 80°C to 100°C, approximately around 350°C. Welding speed is controlled between 0.1-0.3 meters per minute.
The welding gun moves along the joint in a pendulum motion at a roughly 90-degree angle to the welding rod and parts, ensuring uniform heat distribution and pressure. Hot air can be supplied using dry air or inert gases like nitrogen to prevent oxidation and degradation during welding.
Proper preparation includes beveling the sheet edges and securely clamping the sheets in place to avoid misalignment. Skilled manual operation is required, as welders typically hold the welding tool with one hand while feeding the welding rod into the joint with the other. Modified welding tools, such as rollers, can enhance pressure control and improve weld quality and speed.
Applications of PP Plastic Sheet
PP sheets are widely used in various industries due to their excellent chemical resistance, mechanical properties, and versatility:
- Acid and alkali resistant equipment
- Electroplating and solar photovoltaic equipment
- Environmental protection equipment
- Wastewater and exhaust gas discharge equipment
- Scrubbing towers and dust-free rooms
- Semiconductor manufacturing equipment
- Plastic water tanks and containers
- Thick PP sheets for stamping plates and machine pads
- Advertising signboards
- Reusable recycling bins for various industries
- Industrial protective panels for cables, glass, steel, and other products
- Construction material protection such as elevator floors and walls
- Electronics industry protective packaging for IC wafers, TFT-LCD components, etc.
- Household appliances like washing machine back panels and refrigerator insulation
- Food, pharmaceutical, and beverage packaging
Frequently Asked Questions (FAQ)
- What are the main types of PP plastic sheets?
- The main types include homopolymer PP sheets, random copolymer PP sheets, glass fiber reinforced PP sheets (FRPP), and calcium-modified PP sheets.
- What is the maximum thickness available for PP sheets?
- PP sheets are available from 0.5 mm up to 100 mm thickness, depending on customer requirements.
- Can PP sheets be welded?
- Yes, PP sheets can be welded using hot air welding with proper welding rods made from matching materials to ensure strong joints.
- What industries commonly use PP sheets?
- PP sheets are used in chemical processing, electronics, environmental protection, food packaging, and construction among others.
- How do modified PP sheets differ from pure PP sheets?
- Modified PP sheets contain additives like calcium or glass fibers to enhance dimensional stability, rigidity, heat resistance, and impact strength.
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