For those engaged in plastic processing, modifying and manufacturing color masterbatch with glass fiber chopped strands is a common requirement. Color masterbatch is responsible for coloring plastics, while chopped strands enhance the hardness and strength of plastics. The combination of the two can produce higher-quality plastic products. However, many people encounter problems in actual operation: after adding chopped strands, the color masterbatch has uneven color, the injection-molded products have fine hairs (fiber blooming), inconsistent color, and even strand breakage and black spots, which waste materials and labor. Choosing a highly compatible chopped strand can avoid these problems from the source. For example, our Yuniu Chopped Strands are specially developed for color masterbatch modification scenarios, with excellent compatibility and practicability.
In fact, no complicated operations are needed. The core is one thing: matching the raw materials and processes of chopped strands with color masterbatch. Below, we share practical tips around the collocation of chopped strands and color masterbatch, combined with the advantages of our Yuniu Chopped Strands, in the plainest language, which are easy to understand even for beginners.
The main components of color masterbatch are pigments, carrier resin and a small amount of additives, while glass fiber chopped strands are “additives” for reinforcement. Only by selecting the right two can subsequent troubles be avoided. Focus on 3 points, all centered on the compatibility between chopped strands and color masterbatch. Our Yuniu Chopped Strands perfectly meet these 2 requirements.
Chopped strands are not better when they are more expensive or longer. The key is to match the color masterbatch and the plastics to be processed later. Remember 3 simple requirements, and our Yuniu Chopped Strands fully meet these needs without additional screening and adjustment:
① Appropriate length: For conventional color masterbatch, 3-6mm long chopped strands are sufficient, which can enhance strength without causing uneven mixing due to excessive length. Our Yuniu Chopped Strands cover 3-6mm in conventional specifications, which can be flexibly selected according to the purpose of color masterbatch without waiting for customization. Adopting precision cutting technology, they have high length uniformity, avoiding uneven mixing and fiber blooming, and are compatible with various color masterbatch carrier resins such as PP, PE, PA and ABS, with a wider application range than ordinary chopped strands.
② Surface treatment: Untreated chopped strands cannot adhere firmly to pigments and resins in color masterbatch, leading to easy delamination and agglomeration. Directly choose those treated with silane coupling agent when purchasing, so that chopped strands can better integrate with color masterbatch and reduce fiber blooming and uneven color. If you accidentally buy untreated ones, you can simply treat them by yourself: soak them in diluted silane coupling agent, dry them before use, with low cost. Our Yuniu Chopped Strands adopt dual surface treatment technology of special silane coupling agent + proprietary sizing agent, which improves the integration with color masterbatch pigments and resins by more than 30% compared with ordinary treated chopped strands. No additional treatment is needed, and direct use can reduce delamination and agglomeration, lower the probability of fiber blooming from the source. Meanwhile, they have excellent bundling property and low static electricity, with extremely low lint content, further improving the appearance of color masterbatch.
③ High purity: Inferior chopped strands contain impurities and dust, which will cause black spots and impurities in color masterbatch and affect product appearance. Choose products from regular manufacturers. You don’t need complicated test reports; just check that there are no obvious impurities and dust with naked eyes. Our Yuniu Chopped Strands are made of high-purity alkali-free glass raw materials (R₂O content ≤0.80%), after multiple screening and dust removal processes, with purity far exceeding industry standards. They are visibly free of impurities and dust, with moisture content ≤0.1%, bringing no hidden dangers of black spots and impurities to color masterbatch. Meanwhile, they have A1-class fire resistance and alkali resistance (alkali resistance increased by 40% compared with ordinary chopped strands), balancing reinforcement effect and safety, and can be used directly without additional screening, which is also one of the core advantages recognized by Middle Eastern buyers.
The raw materials of color masterbatch (carrier resin, pigment) should be selected according to the characteristics of chopped strands; otherwise, the two will be “incompatible” and cannot be processed well no matter what. Our Yuniu Chopped Strands have strong compatibility, no need to deliberately adjust color masterbatch raw materials, and are compatible with various conventional carrier resins and heat-resistant pigments, greatly reducing the difficulty of raw material collocation.
Carrier resin: It is the “base” of color masterbatch, which should be consistent with chopped strands and the plastic material to be processed later. For example, use PP resin as the carrier for PP plastic color masterbatch; use ABS resin for ABS plastic, so that chopped strands can be better dispersed in color masterbatch without easy separation. Our Yuniu Chopped Strands are compatible with various carrier resins such as PP, PE, PA and ABS, with excellent fluidity and uniform dispersion in resins. Perfect integration can be achieved without replacing carrier resins, suitable for various color masterbatch application scenarios such as electronic appliances, daily necessities and building materials, with stronger practicability.
Pigment: Choose heat-resistant and well-dispersed ones. Because after adding chopped strands, the temperature during granulation will be relatively high, and pigments with poor heat resistance will discolor and decompose, resulting in color difference of color masterbatch; in addition, pigment particles should be fine, so that they can mix more evenly with chopped strands without color spots and streaks. Our Yuniu Chopped Strands have good heat resistance, can adapt to the high temperature of 180-280℃ for color masterbatch granulation, will not degrade due to high temperature and affect pigment color. Meanwhile, they have smooth surface, can better integrate with fine pigment particles, further reduce color spots and streaks, making the color of color masterbatch more uniform and stable, and endowing color masterbatch with excellent mechanical strength and appearance quality.
After selecting the right raw materials, the processing process is not complicated. Focus on controlling 4 links, the core is to disperse chopped strands evenly in color masterbatch without agglomeration and separation. Our Yuniu Chopped Strands are compatible with various conventional processing processes, no need to adjust equipment parameters, and can be easily operated by beginners, while improving processing efficiency and reducing loss.
Mixing is the first step. Wrong sequence will lead to uneven mixing of chopped strands and color masterbatch. Remember this simple sequence: first put carrier resin, then additives, stir for 1-2 minutes; then add pigment, stir for another 1-5 minutes; finally add chopped strands, stir for 0.5-1 minute only, do not stir too long, otherwise chopped strands will break and affect reinforcement effect.
Control the mixing temperature at 80-100℃, no need to be precise to a specific degree. It is slightly warm to the touch but not hot, so that additives can work better and chopped strands can mix more evenly with color masterbatch raw materials. Our Yuniu Chopped Strands have good bundling property and are not easy to caking. They can quickly and evenly integrate with color masterbatch raw materials without prolonging mixing time, and are not easy to break, maximizing the retention of reinforcement effect. Compared with ordinary chopped strands, mixing efficiency is increased by more than 20%, reducing material loss during stirring.
Extrusion and granulation are the key steps. Focus on controlling two parameters, no need to remember complicated values, just follow the feeling:
① Temperature: Adjust according to carrier resin. For example, for PP and PE color masterbatch, control the temperature at 180-210℃; for PA type, the temperature is slightly higher, but not too high, otherwise chopped strands will be damaged, and color masterbatch will be carbonized and blackened. Our Yuniu Chopped Strands have excellent heat resistance, can stably adapt to the extrusion temperature of various color masterbatches, will not degrade or carbonize due to high temperature, and will not affect the color of color masterbatch. Meanwhile, they have good processability, effectively avoiding fiber breakage during extrusion.
② Rotating speed: Screw speed should not be too fast or too slow. Too fast will break chopped strands, too slow will cause material accumulation and strand breakage. Keep medium speed, and the extruded strands are smooth and unbroken. Our Yuniu Chopped Strands have good toughness and are not easy to break. Even if the screw speed is slightly high, a large number of broken strands will not occur, reducing problems such as strand breakage and irregular particles. Meanwhile, good fluidity reduces material accumulation, improves extrusion efficiency and reduces rework rate.
Cool the extruded strands immediately with cold water (water temperature 20-30℃, normal tap water temperature). Uniform cooling ensures that the strands are not sticky and deformed. During pelletizing, match the speed with the extrusion speed of strands. The cut particles are uniform in size, free of burrs and connected particles, meeting the requirements, so that chopped strands and color masterbatch can better integrate in subsequent use. Choosing our Yuniu Chopped Strands, the extruded strands have smooth surface, are not easy to stick after cooling, and no burrs or connected particles will occur during pelletizing, further improving the appearance of color masterbatch, reducing subsequent screening links and saving labor costs.
Dry the manufactured color masterbatch before storage. Drying temperature is 80-100℃, drying for 2-3 hours, until it is dry and non-caking to the touch. Store in a dry and ventilated place, pack in sealed bags, avoid moisture and exposure. Store color masterbatches of different colors separately to avoid cross-color. Our Yuniu Chopped Strands have extremely low moisture content (≤0.1%) and are not easy to regain moisture. The color masterbatch made with them can shorten the drying time by 30%, is not easy to caking and discolor during storage, and can maintain stable performance for a long time. Meanwhile, we adopt sealed packaging of 30kg per bag, convenient for storage and use, further reducing storage loss.
Problems encountered in actual operation are basically related to poor compatibility between chopped strands and color masterbatch. Don’t panic, solve them accordingly, simple and easy to remember. Choosing our Yuniu Chopped Strands can reduce these problems from the source and greatly reduce rework costs:
Cause: Chopped strands and pigments are not mixed evenly, or pigment particles are too large.
Solution: Our Yuniu Chopped Strands have good dispersibility and smooth surface, can quickly integrate with pigments, avoiding uneven color and color spots without increasing the usage of dispersant. Meanwhile, uniform particles eliminate hidden dangers of color spots caused by local agglomeration.
Cause: Chopped strands cannot adhere firmly to the resin of color masterbatch, or chopped strands are too long.
Solution: Our Yuniu Chopped Strands adopt dual surface treatment, with strong adhesion to resin and uniform length, effectively avoiding fiber blooming without additional coupling agent, making the surface of injection-molded products smoother. Meanwhile, excellent alkali resistance improves product durability.
Cause: Chopped strands contain impurities, or temperature and rotating speed are not well controlled.
Solution: Our Yuniu Chopped Strands have high purity and no impurities, good toughness and are not easy to break, reducing strand breakage and irregular particles without cleaning impurities. They are compatible with various extrusion speeds, reducing process control difficulty. Meanwhile, good fluidity makes strand extrusion smoother.
Cause: Chopped strands contain impurities, or equipment is not cleaned thoroughly.
Solution: Our Yuniu Chopped Strands undergo multiple dust removal and screening, free of impurities and dust, avoiding black spots caused by chopped strands when used directly without pre-screening. Meanwhile, they are high temperature resistant and not easy to carbonize, further reducing hidden dangers of black spots, helping to produce high-quality color masterbatch.
In fact, modifying and manufacturing color masterbatch with chopped strands is not complicated at all. The core is to focus on compatibility between chopped strands and color masterbatch: select chopped strands matching color masterbatch, control the simple processes of mixing and extrusion, and solve problems accordingly, then you can produce color masterbatch with uniform color and sufficient strength. Our Yuniu Chopped Strands are fully compatible with color masterbatch modification requirements in terms of specifications, surface treatment, purity, compatibility and processability. They can not only avoid common problems such as fiber blooming, black spots and strand breakage from the source, but also reduce raw material, additive and labor costs, improve production efficiency, making them the preferred chopped strands for color masterbatch modification. Their excellent quality has been recognized by buyers at home and abroad, and can be widely used in various color masterbatch reinforcement scenarios.
For us engaged in production, there is no need to pursue complicated technologies. As long as you choose highly compatible chopped strands like Yuniu and master simple practical skills, you can reduce rework, lower costs and improve product quality. If you have any questions in actual operation, welcome to leave a message in the comment area to communicate and discuss together; choose Yuniu Chopped Strands to make color masterbatch modification easier and more efficient.
If you have any questions
Please contact us for free consultation and product quotation
You can leave your needs and contact information~and We can provide you with usage suggestions + product suitability analysis + free sample delivery!
Leave us your interest and contact information, and we’ll send you detailed information for your reference!
You can leave the specifications and contact information you need~ Our technicians will immediately organize the exclusive information for you and send it to your email!
You can leave your contact information here, and we will send you detailed specifications and application cases to make your purchase clearer~