Provincial-level New Industrial Product – Paint Barrel Cap Injection Mold Based on Moldex3D

SINOMOULD “Paint Bucket Lid Injection Mould” Recognised as Zhejiang Provincial New Industrial Product

In 2024, the Zhejiang Provincial Department of Economy and Information Technology (Zhejiang EITD) organised expert review and appraisal for provincial‑level new industrial products. SINOMOULD’s self‑developed “Paint Bucket Lid Injection Mould” successfully passed the review and was recognised as a Zhejiang Provincial New Industrial Product. As the competent authority for the industrial and information technology sectors in Zhejiang Province, the “Provincial New Industrial Product” designation requires that the product demonstrates significant achievements in technical breakthroughs, process improvement, and product quality; reaches a technological level of domestic leading or above; possesses key core technologies and independent intellectual property; and that the average sales revenue after market launch is not less than RMB 6 million – with stringent evaluation standards and high recognition value. This marks another important technical achievement in the precision injection mould field for SINOMOULD, following 11 new products that passed provincial review in 2021.

Simulation‑Driven Innovation – Cycle Time Significantly Shortened

Paint bucket lids have extremely high requirements for appearance quality and dimensional accuracy, and are prone to defects such as short shots and gas traps during molding. SINOMOULD’s technical team used Moldex3D mould flow analysis software to conduct scientific simulation and process optimisation for the entire paint bucket lid injection molding process. The team carried out a comparative study on the molding differences between valve‑gated hot runners and open hot runners, and optimised the hot runner system design based on simulation results. Among these, the valve‑gated hot runner can work with DKM injection molding machines to achieve simultaneous pre‑plasticizing, effectively shortening the cycle time and meeting the high production efficiency demands of the paint bucket industry.

On this basis, the team further designed Taguchi DOE experiments to systematically optimise injection molding process parameters. The study showed that when process parameters were set to a melt temperature of 250°C, holding time of 2 seconds, and cooling time of 18 seconds, the product showed no appearance quality defects such as short shots or gas traps, and cooling time was significantly reduced. The technical achievement has been published in the academic paper “Analysis of Paint Bucket Lid Injection Molding Process Based on Moldex3D”, reflecting SINOMOULD’s technological innovation capability and deep industry‑university‑research collaboration.

Delivering Mould Solutions with Shorter Cycle Times and Higher Yield for Customers

In the paint bucket packaging industry, cycle time and product yield directly determine production efficiency and overall cost. Through scientific simulation and process optimisation of the entire injection molding process using Moldex3D mould flow analysis software, SINOMOULD provides customers with mould solutions that offer shorter cycle times, higher product yield, and lower production costs. Products are free from appearance quality defects such as short shots and gas traps, effectively reducing scrap rates during customer production and improving overall production line efficiency.

Precision Quality Control – Meeting Industry Stringent Standards

Provincial New Industrial Product designation requires that the product has reliable quality, good performance, and has been tested by a third‑party testing institution. SINOMOULD uses Moldex3D simulation from filling to cooling to precisely simulate and validate key parameters such as hot runner system temperature control, gate flow, and cooling uniformity – ensuring that product dimensional accuracy and appearance quality meet customer requirements. SINOMOULD has over 20 years of development experience in paint bucket moulds, having completed more than 1,000 paint bucket moulds. This deep industry foundation provided solid support for the successful recognition of this Provincial New Industrial Product.

Validity and Ongoing Compliance

According to the management requirements of the Zhejiang Provincial Department of Economy and Information Technology, the provincial new industrial product evaluation result is valid for three years from the date of publication. Recognised enterprises must report annual economic and social benefit indicators within the validity period and accept ongoing tracking evaluation. SINOMOULD will continue to follow up on the reporting requirements, ensuring that the product’s economic and social benefit indicator data remain complete and traceable.

This recognition as a Provincial New Industrial Product is a concentrated reflection of SINOMOULD’s technical strength in mould flow analysis simulation and injection molding process optimisation, and further consolidates the company’s leading position in the paint bucket packaging mould segment.