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The global pet care market has experienced unprecedented growth over the last decade, transitioning from basic utility items to high-tech, ergonomic, and medically conscious products. Among these, pet grooming and loose hair extraction tools have taken center stage. Modern pet owners demand grooming accessories that are not only highly effective at removing undercoat hair but are also comfortable for both the user and the animal. To meet these stringent demands, manufacturers have turned to advanced plastic processing methods, specifically Two-Colour Injection Moulding (also known as 2K or two-shot injection molding).
This advanced manufacturing process allows for the combination of two different plastic materials or colors into a single, cohesive product during a single molding cycle. By fusing a rigid structural polymer (such as ABS or Polypropylene) with a soft, flexible elastomer (such as TPE or TPU), two-colour moulding creates pet grooming brushes and vacuum-assisted hair extractors that offer unparalleled durability, ergonomic comfort, and functional performance. This technological synergy has set a new benchmark in the pet care industry, driving major brands to redesign their product lines around 2K manufacturing principles.
From an industrial perspective, the adoption of two-colour injection moulding has transformed product design and supply chain efficiency. Historically, pet brushes were manufactured using multiple components that required manual assembly—gluing or snapping soft rubber handles onto rigid plastic frames. This traditional method not only increased labor costs and assembly times but also introduced structural vulnerabilities. Over time, moisture, pet shampoos, and mechanical stress would cause the glued parts to detach or degrade, creating crevices where bacteria and mold could thrive.
Two-colour moulding eliminates these post-molding assembly steps entirely. The molecular bond formed between the two materials in the mold cavity ensures that the soft grip and the hard body can never separate, even under extreme mechanical load or chemical exposure. Consequently, commercial brands can offer extended warranties, improve their brand reputation for quality, and reduce return rates significantly. Industrially, this translates to faster cycle times, minimized waste, and a highly automated production line that scales efficiently to meet global demand.
Successful two-colour injection moulding relies heavily on the chemical compatibility of the two chosen resins. For pet grooming tools, the combination of a Polypropylene (PP) substrate with a Thermoplastic Elastomer (TPE) is highly popular due to its excellent cost-to-performance ratio and strong chemical adhesion. During the process, the second material is injected while the first is still warm, allowing molecular diffusion across the boundary layer, resulting in a permanent, seamless bond without the need for adhesives.
The applications of 2K injection moulding within pet grooming tools are diverse, ranging from hand-held deshedding brushes to sophisticated vacuum-integrated extraction nozzles. Understanding these scenarios highlights why high-precision mold manufacturing is crucial for this sector.
Pet grooming can be a time-consuming and repetitive task, often leading to hand fatigue or wrist strain for professional groomers and pet owners alike. By using two-colour moulding, designers can strategically place soft-touch TPE zones on the handle of a grooming tool. These zones conform to the user's hand shape, provide a secure grip even when wet during bathing, and dampen vibrations when connected to motorized vacuum systems. The rigid ABS skeleton provides the structural strength needed to withstand the force of pulling through thick, matted pet coats.
Traditional slicker brushes feature metal pins that can scratch a pet's sensitive skin if used incorrectly. Advanced grooming tools now utilize 2K moulding to create hybrid bristle designs. The core of the bristle or the structural base plate is molded from a rigid polymer to maintain alignment, while the tips of the bristles are overmolded with a soft, skin-safe TPE. This design extracts loose undercoat hair efficiently while providing a gentle, massaging sensation that stimulates the pet’s skin circulation without causing irritation.
Vacuum-assisted loose hair extraction tools are growing rapidly in popularity. These devices connect directly to a vacuum cleaner to suck away loose fur instantly as it is brushed off. To ensure optimal suction power and quiet operation, these tools require precise seals and internal airflow channels. Two-colour injection moulding allows for the integration of soft sealing lips directly onto the rigid vacuum attachment body. This ensures a perfect airtight seal against the pet's coat and prevents whistling noises caused by air leaks, making the grooming experience significantly less stressful for noise-sensitive animals.
Many modern deshedding tools feature a push-button mechanism that retracts the bristles to quickly dump collected hair. The internal slide tracks, buttons, and return springs must operate smoothly without wearing down. By utilizing low-friction polymers in combination with structural supports through multi-shot moulding, manufacturers can create self-cleaning assemblies that are highly wear-resistant, preventing dust and fine pet dander from jamming the internal mechanism over years of use.
Precision Engineering Meets Global Manufacturing Excellence
Founded in the heart of China’s manufacturing growth triangle in Yuyao, Zhejiang Province, Ningbo Jinlong Electric Appliance Co., Ltd. is a premier high-tech enterprise specializing in two core industrial pillars: Professional Mold Manufacturing and Advanced Home Appliance R&D.
Spanning a massive 68,000-square-meter modernized facility with $16 million USD in fixed assets, we are strategically positioned near the Ningbo Port and International Airport, ensuring seamless global logistics and supply chain efficiency.
Our tool-room is the foundation of our quality. With a dedicated 5,000-square-meter precision workshop, we combine Swiss, Japanese, and American technology to deliver export-quality tooling for the world’s most demanding industries.
As a global leader in vacuum cleaner and sanitization technology, we operate 18 automated assembly lines with a robust annual capacity of 4 million units. Our R&D team doesn't just follow trends—we set them. We hold global invention patents for unique technologies, such as our integrated vacuum and air purification systems that enhance the user experience through scent-diffusion and filtration.
Creating highly functional 2K molds for pet grooming applications requires a deep understanding of injection molding physics, tool design, and material behavior. At Ningbo Jinlong, we employ state-of-the-art software and machinery to address the unique challenges of multi-shot molding.
Before steel is cut, our engineering team utilizes advanced Mold Flow Analysis software to simulate the injection process of both materials. This step is critical in two-colour moulding, as the second injection relies on the precise temperature and solidification state of the first shot. Flow simulation helps identify potential issues such as weld lines, air traps, and material bleeding, ensuring that the interface between the soft grip and the hard body is clean, structurally sound, and aesthetically flawless.
Depending on the part geometry, we utilize either rotary table or core-back (sliding gate) technology. Rotary table molding involves rotating the mold half to a second station for the second material shot. This is ideal for complex, high-volume pet brush handles that require complete overmolding. Core-back technology, on the other hand, uses internal pneumatic or hydraulic slides to open up new cavities within the mold for the second material. This method is highly efficient for localized soft-grip zones or integrated seals on pet vacuum attachments.
Because we operate under IATF 16949 (Automotive Quality Management System) standards, we apply the same level of rigorous quality control to our pet care and consumer electronics tooling as we do to automotive safety components. Every mold undergoes extensive trial runs, and the molded parts are subjected to strict dimensional analysis, adhesion testing, and environmental stress cracking resistance (ESCR) testing to ensure they can withstand the oils, shampoos, and mechanical stresses of daily pet grooming.
Backed by a 30+ member R&D team and an annual investment exceeding $1.5 million USD, we secure new technological breakthroughs and patents every year.
Our 60+ member Quality Assurance team manages an internal testing facility capable of ROHS environmental measurement. We are fully compliant with ISO 9001, ISO 14001, ISO 45001, and IATF 16949.
Our products meet the strictest international standards, including GS, CE, UL, CCC, ROHS, and WEEE, ensuring smooth market entry for our clients.
From initial mold design and trial to mass injection molding and final assembly, we provide a "one-stop" manufacturing service that reduces lead times and costs.
