Introduction to 5 Gallon Preform Injection Mold
The 5 gallon preform injection mold is specifically engineered for producing PET preforms for 18.9L (5-gallon) large-capacity water containers. Preforms produced using this 5 gallon preform mold undergo subsequent heating, stretching, and blow molding processes to become standard 5-gallon water containers.
These finished containers are the mainstream packaging solution for commercial and residential drinking water.
To accommodate manufacturers of varying production scales, KRMOLD 5 gallon preform mould supports customizable multi-cavity configurations. Standard specifications include 2, 4, 6, and 8-cavity layouts, fully meeting requirements ranging from small-batch pilot runs to large-scale mass production, thereby enabling efficient, stable, and standardized preform manufacturing.
Specifications of 5 Gallon Preform Injection Mold
| Application | Mineral Water Bottle |
| Resin Material | PET |
| Neck Finish | 55mm |
| Cavity Number | 2 (Depending on the design) |
| Cavity Material | S136H |
| Core Material | S136H |
| Mold Base | 4Cr13 |
| Hot Runner | In-house Brand |
| Anti-Crystallization | Not Included |
| Sample Provision | 5 Shot Samples |
| Target Life | 6 Million Cycles |
Advantages of 5 Gallon Preform Injection Mold
High Production Efficiency
KRMOLD 5 gallon plastic injection preform mould utilizes a standardized multi-cavity core design. With configurations ranging from 2 to 8 cavities and compatibility with specialized dual-mold machine layouts, it enables parallel, synchronized production.
This customized 5 gallon PET preform mold maintains stable, high-speed injection performance throughout the process, eliminating production bottlenecks. It perfectly meets the mass production needs of water bottling plants and contract manufacturers while effectively shortening production cycles.
Cost Reduction
The multi-cavity structural design effectively amortizes the 5 gallon preform injection mold cost across individual preforms, thereby reducing the unit production cost at the source.
The 5 gallon preform mould features an optimized gate design that eliminates the need for manual gate trimming—a standard step in traditional processes. This design reduces PET raw material waste and significantly cuts labor and maintenance costs, thereby lowering overall production investment.
Furthermore, the 5 gallon preform mold is constructed from premium S136 mold steel and undergoes multiple heat treatment processes, including precision vacuum quenching and tempering. These treatments greatly enhance the 5 gallon PET preform mold's hardness, toughness, and wear resistance, resulting in a service life exceeding 1.5 million cycles.
Even under rigorous, continuous, and long-term production conditions, the 5 gallon plastic injection preform mould maintains an extremely low failure rate. This minimizes the frequency of repairs, reduces mold replacement costs, and cuts losses associated with equipment downtime, helping enterprises achieve long-term cost reductions and efficiency gains.
Cost Reduction
The multi-cavity structural design effectively amortizes the 5 gallon preform injection mold cost across individual preforms, thereby reducing the unit production cost at the source.
The 5 gallon preform mould features an optimized gate design that eliminates the need for manual gate trimming—a standard step in traditional processes. This design reduces PET raw material waste and significantly cuts labor and maintenance costs, thereby lowering overall production investment.
Furthermore, the 5 gallon preform mold is constructed from premium S136 mold steel and undergoes multiple heat treatment processes, including precision vacuum quenching and tempering. These treatments greatly enhance the 5 gallon PET preform mold's hardness, toughness, and wear resistance, resulting in a service life exceeding 1.5 million cycles.
Even under rigorous, continuous, and long-term production conditions, the 5 gallon plastic injection preform mould maintains an extremely low failure rate. This minimizes the frequency of repairs, reduces mold replacement costs, and cuts losses associated with equipment downtime, helping enterprises achieve long-term cost reductions and efficiency gains.
Applications of 5 Gallon Preform Injection Mold
The 5 gallon plastic injection preform mould are specifically designed for producing large-capacity, thick-walled PET preforms. Once blow-molded, these preforms are transformed into various large-capacity, sealed packaging containers suitable for a wide range of industries and packaging applications.
1) Bottled Water Industry
The high-quality preforms produced by this 5 gallon preform mold serve as the core raw material for large-format containers used for mineral and purified water in homes, offices, schools, hospitals, and industrial parks. They meet the standardized mass-production requirements of major drinking water manufacturers.
2) Large-Capacity Liquid Packaging Industry
Preforms produced using the 5 gallon PET preform mold offer excellent stability, sealing performance, and corrosion resistance.
They can be processed into containers for various liquids—such as edible oil, fruit juice concentrates, functional beverages, and large-format personal care or household cleaning products—catering to diverse packaging needs in the FMCG and food & beverage sectors.
3) Injection Molding & Contract Manufacturing Industry
This standardized, high-precision 5 gallon preform mold provides reliable support to major water brands, OEMs, and specialized injection molding facilities.
It enables enterprises to handle custom orders for 5-gallon containers and supports a wide range of contract manufacturing scenarios.
One-Stop Solution
KRMOLD is more than just a supplier of 5 gallon preform mould; we provide customers with a comprehensive, one-stop mold solution.
In addition to the core 5 gallon PET preform mold, KRMOLD supplies complementary injection molds for producing specialized components such as PE caps and handles, helping customers establish complete production lines for 5-gallon water containers.
This integrated solution ensures unified coordination, commissioning, and after-sales service for all molds. Customers avoid the complexity of managing multiple suppliers, thereby significantly reducing procurement communication costs, equipment compatibility risks, and maintenance expenses, while accelerating the launch and efficient operation of their five-gallon packaging projects.
Highlights of KRMOLD 5 Gallon Preform Injection Mold Solution
A Reliable Mold Manufacturer
With years of deep expertise in injection mold R&D and manufacturing, KRMOLD has accumulated a wealth of proven experience across various industries.
We excel in the design, development, production, and customization of injection molds.
Thanks to our consistent product quality and comprehensive service system, KRMOLD injection molds have earned the trust and recognition of numerous clients.
Experienced Team
KRMOLD has assembled a professional, comprehensive service team covering the entire workflow. The team includes specialists across all key roles, such as product structural design, mold design, precision mold assembly, rigorous quality control inspection, and after-sales support.
From initial requirements gathering and solution design to mid-stage precision manufacturing, assembly, debugging, and sample testing, through to final delivery and after-sales support, every process and stage is subject to strict standardized management.
This ensures that every 5 gallon preform injection mold leaving the factory meets high-end quality standards, guaranteeing precision, stability, and longevity.
Superior Mold Solutions
KRMOLD tailors 5 gallon PET preform mold solutions to the specific needs of each client—considering factors such as production capacity, product specifications, existing equipment, and application scenarios—by thoroughly analyzing their production pain points.
Whether the requirement involves selecting the right number of cavities, structural optimization, temperature control integration, specialized process customization, or equipment commissioning, KRMOLD precisely matches client needs.
We provide a highly compatible, efficient, and cost-effective one-stop customization service for 5 gallon preform mould.
Specify the type of plastic (e.g. PP, ABS) and post-processing requirements (e.g. spraying, silk-screen printing), and provide 2D or 3D plastic part drawings should be provided. At the same time, provide the production volume, appearance requirements, tolerance standards, etc.
Generally speaking, our engineers will start to prepare the quotation immediately after the customer provides the complete production requirements. Usually it takes about 1-3 days.
The lead time for regular injection molds is usually 30-60 days, and may be longer for complex molds. For example, the typical lead time for liquid silicone molds is around 60 days, covering design, manufacturing, mold testing, etc.
High-precision processing technology: High-precision equipment such as CNC machining centers (CNC) and electric discharge machining (EDM) are used to optimize the design process in combination with CAD/CAM software. Quality control: Inspection of key dimensions of the mold by Coordinate Measuring Machine (CMM) and verification of multiple sample batches during the trial molding stage. Material Selection: Use die steel with high wear resistance (e.g. H13, S136) and surface treatment (e.g. nitriding, chrome plating) for die nuts to extend the life.
After every 50,000 molds, check the guide pillar, ejector pin and other wear parts, and clean up the residual plastic and rust on the mold surface. Use high temperature grease for sliding parts (e.g. tilt top, slider) to reduce friction loss. Ensure that the water circuit is smooth and the temperature difference is ≤5℃ to avoid cracking of the mold due to thermal stress.
Mould cost of materials accounted for about 30-40% (such as 1 ton of P20 steel price of about 20,000 yuan), processing costs accounted for more than 50% (CNC labor hourly rate of about 80-150 yuan / hour). Small batch production can choose aluminum mold or simplify the structural design; more than 100,000 pieces is recommended to use carbide inserts to enhance life!
Mould injection products need to fully meet the design requirements (such as size, appearance), and can be continuous and stable production. Mold marking, inspection reports (such as material hardness test) and engineering drawings should be complete.
Mould steel (such as S136H, NAK80 and other imported materials cost more) and the type of mold embryo (aluminum mold short-term cost is low but short life) directly affect the cost, the use of CAD/CAE/CAM design technology, hot runner system, etc. will increase the upfront investment, but can enhance the long-term benefits (such as reducing the sprues, increase production capacity).
