HYFabricsupply is a professional non-woven fabric manufacturer of high quality Polypropylene Non-woven Fabric, Polyester spunbonded non-woven fabric, Spunlaced non-woven fabric,and more.
No. 3 Luoqian Street, Beiluo Town, Shouguang City, Weifang City, Shandong Province
The factors influencing polypropylene spunbond nonwoven fabric include polypropylene raw materials, production equipment, and production parameter control. The most crucial factor is the raw materials. Therefore, in order to produce high-quality non-woven fabric, one must select high-quality polypropylene.The parameters of polypropylene granules are core indicators for measuring their performance and applicable scenarios, covering multiple dimensions such as physical, mechanical, thermal, and processing properties. Here is a detailed analysis of key parameters:
<!--[if !supportLists]-->1. <!--[endif]-->Density
It is usually between 0.89-0.91g/cm³, which is a core indicator of the lightweight characteristics of polypropylene granules. The density of different types of granules (such as homopolymer PP and copolymer PP) varies slightly. Copolymer PP has a slightly lower density than homopolymer PP due to containing a small amount of ethylene monomers. This parameter directly affects the weight of products and is crucial in fields sensitive to weight reduction such as automobiles and packaging.
<!--[if !supportLists]-->2. <!--[endif]-->Melt Flow Rate (MFR, Melt Index)
The unit is g/10min, which is a key indicator to measure the fluidity of resin. The test condition is 230℃ and 2.16kg load. The common range is 0.5-100g/10min:
Low MFR (≤10): Poor fluidity, suitable for producing thick-walled products (such as pipes, plates);
High MFR (≥20): Good fluidity, suitable for thin-walled injection molded parts (such as disposable lunch boxes, precision parts).
The MFR fluctuation of granules is usually ≤5%, much lower than that of powder, ensuring processing stability.
<!--[if !supportLists]-->1. <!--[endif]-->Ash Content
It refers to the inorganic impurities (such as catalyst residues, additives) remaining after the granules are burned, usually ≤0.05%. Food-grade and medical-grade granules have stricter requirements on ash content (≤0.02%) to avoid impurity migration affecting safety.
<!--[if !supportLists]-->2. <!--[endif]-->Moisture Content
Generally ≤0.05%. After drying during granulation, the moisture content of granules is much lower than that of powder (powder is usually ≤0.1%), which can be directly processed without pretreatment, reducing production links.
<!--[if !supportLists]-->1. <!--[endif]-->Tensile Strength
It measures the ability of the material to resist tensile failure, with the unit of MPa. Homopolymer PP granules have higher tensile strength (25-35MPa). Copolymer PP has slightly lower tensile strength (20-30MPa) due to the toughening effect of ethylene segments, but has better impact resistance. This parameter determines the load-bearing capacity of products. For example, automobile bumpers need to be ≥25MPa.
<!--[if !supportLists]-->2. <!--[endif]-->Impact Strength
It is divided into notched impact strength (at 23℃, homopolymer PP is about 2-5kJ/m², copolymer PP can reach 5-15kJ/m²) and unnotched impact strength (homopolymer PP is about 20-50kJ/m²). At low temperatures (-20℃), the impact strength of copolymer PP decreases less than that of homopolymer PP, making it suitable for products used in cold regions (such as outdoor pipes).
<!--[if !supportLists]-->3. <!--[endif]-->Flexural Strength and Modulus
Flexural strength reflects the material's ability to resist bending deformation (homopolymer PP is about 30-40MPa), and flexural modulus reflects rigidity (homopolymer PP is about 1500-2000MPa). The flexural modulus of reinforced modified granules (such as glass fiber reinforced PP) can be increased to 3000-4000MPa, which is used for structural parts (such as household appliance frames).
<!--[if !supportLists]-->4. <!--[endif]-->Hardness
Expressed by Shore hardness D, ranging from 60-80D. Homopolymer PP has higher hardness than copolymer PP. Hardness affects the wear resistance of products. For example, turnover boxes need to be ≥70D to resist frequent collisions.
<!--[if !supportLists]-->1. <!--[endif]-->Melting Point (Tm)
The melting point of homopolymer PP granules is about 160-165℃. Copolymer PP has a slightly lower melting point (150-160℃) due to the reduced crystallinity caused by ethylene components. This parameter determines the processing temperature (usually 20-50℃ higher than the melting point) and the upper limit of the product's service temperature (short-term use ≤120℃).
<!--[if !supportLists]-->2. <!--[endif]-->Heat Distortion Temperature (HDT)
It refers to the temperature at which the material begins to deform under a certain load (1.82MPa), with the unit of ℃. Homopolymer PP is about 60-70℃, copolymer PP is about 50-60℃. After reinforcement modification, it can be increased to 100-140℃ (such as glass fiber reinforced PP), suitable for high-temperature resistant scenarios (such as dishwasher components).
<!--[if !supportLists]-->3. <!--[endif]-->Vicat Softening Point
Another indicator to measure the heat resistance of materials, with the unit of ℃, usually 10-20℃ higher than HDT. Homopolymer PP is about 150-160℃, used to evaluate the stability of products under long-term heating.
<!--[if !supportLists]-->1. <!--[endif]-->Molding Shrinkage Rate
It refers to the dimensional shrinkage ratio of the product after cooling, ranging from 1.0% to 2.5%. The shrinkage rate of homopolymer PP is higher than that of copolymer PP, and it is directional (the shrinkage rate in the flow direction is slightly larger). It is necessary to reserve compensation in mold design to avoid product warpage.
<!--[if !supportLists]-->2. <!--[endif]-->Thermal Stability (Oxidation Induction Time, OIT)
It measures the ability of the material to resist thermal oxidative degradation, with the unit of min, tested in an oxygen atmosphere at 200℃. The OIT of ordinary granules is ≥20min, and the OIT of weather-resistant granules with antioxidants can reach 50-100min, suitable for outdoor products (such as sunshades, agricultural films).
<!--[if !supportLists]-->3. <!--[endif]-->Chemical Resistance
There is no direct quantitative parameter, but it is verified by acid-base and solvent corrosion resistance tests: it is stable to dilute acids, alkalis, alcohol, etc., and can be used for chemical pipelines and medical containers; but it is not resistant to strong oxidizing reagents (such as concentrated nitric acid).
Antibacterial Property: Medical-grade granules added with silver ions have an antibacterial rate of ≥99% against Escherichia coli and Staphylococcus aureus;
Flame Retardancy: The vertical burning grade of flame-retardant granules must reach UL94 V-0, and the oxygen index (LOI) is ≥28%;
UV Resistance: After UV aging test (1000h), the tensile strength retention rate of weather-resistant granules is ≥80%.
Taking 30g3ft30ft as an example:
1、Weight: 30g±1g
2、Net weight per piece: 885g (1.95 pounds) (±5%)
3、Transverse tensile force: greater than 25N
4、Longitudinal tensile force: greater than 40N
5、Tear: longitude greater than 14N, latitude greater than 9N
6、UV test for 1000 hours, tensile test decrease ≤20%
As a manufacturer of polypropylene non-woven fabrics, we choose raw materials according to the specific use of customers. For example, when used as plant frost protection blankets, we must choose polypropylene with high melt index, high tensile strength, and high UV resistance for production. This raw material can greatly extend the service life of the product. Of course, high-quality raw materials will also lead to higher prices of polypropylene non-woven fabrics. Therefore, it is recommended that traders, wholesalers, and retailers who buy frost protection cloth choose HYFabricsupply, a professional factory. Stable and high-quality products can protect your brand and increase sales.
