Provincial-level New Industrial Product – Daily Chemical Plastic Flip-Top Cap Injection Mold with Automatic Thread Unscrewing and Automatic Closing Mechanism

SINOMOULD “Daily Chemical Flip‑Top Cap Mould” Recognised as Zhejiang Provincial New Industrial Product

In 2025, 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 “Daily Chemical Flip‑Top Cap 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 clear technological leadership in structure, materials, and processes; reaches a technological level of domestic leading or above; 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 is a concentrated reflection of SINOMOULD’s over 20 years of technical accumulation in the daily chemical packaging flip‑top cap mould field.

Two Mechanisms Integrated Innovation – Reshaping the Flip‑Top Cap Production Process

In traditional production of daily chemical flip‑top cap products (such as shampoo bottle caps and laundry detergent flip‑tops), two major pain points exist – thread demolding requires manual or downstream operations, and the closing of the flip‑top cap relies on manual labour, resulting in persistently high defect rates. SINOMOULD integrates an automatic thread rotation demolding mechanism and an in‑mould automatic cap‑closing mechanism into a single mould. During the injection molding cycle, both the thread demolding and cap‑closing processes are completed simultaneously, fundamentally restructuring the production process.

For thread demolding – flip‑top caps typically have internal threads that cannot be demolded by conventional ejection methods. SINOMOULD adopts an automatic rotating thread demolding mechanism. A hydraulic motor or servo motor drives a gear and sprocket system to rotate the thread core, allowing the product to be ejected smoothly after the threads are completely released. This mechanism requires extremely high precision to ensure that the number of rotations of the thread core exactly matches the demolding stroke, preventing damage to the final thread.

For in‑mould cap‑closing – traditional processes require manual closing of the cap to the base. The force and angle of manual closing are difficult to control consistently, resulting in a defect rate of approximately 0.8%, of which about 60% is due to incomplete cap‑closing. SINOMOULD integrates an automatic cap‑closing mechanism inside the mould. A micro‑cylinder or servo mechanism, working in coordination with the control system, completes the cap‑closing action during the mould opening process. Production lines using in‑mould automatic cap‑closing technology can reduce the cap‑closing defect rate to below 0.02%, and the number of operators per shift can be reduced from 3 to 1.

Eliminating Processes, Reducing Labour, and Improving Yield for Customers

For daily chemical packaging manufacturers, flip‑top caps are produced in huge volumes. The downstream cap‑closing process has long relied on manual labour, resulting in high labour costs and significant quality variation. By integrating these two downstream processes into the mould, SINOMOULD enables customers to obtain fully closed finished products directly from the cavity – eliminating the downstream cap‑closing process, reducing operators, and significantly improving yield. With over 20 years of R&D and manufacturing experience in the cap mould field, SINOMOULD’s flip‑top cap moulds can reach up to 144 cavities, meeting the high‑volume production needs of the daily chemical industry.

Precision Quality Control – Ensuring Long‑Cycle High‑Speed Production

Provincial New Industrial Product designation requires that the product has reliable quality and good performance. Flip‑top cap injection moulds impose extremely high requirements on runner system balance. SINOMOULD uses a full hot runner valve‑gate system to ensure that the melt reaches all cavities simultaneously, with no waste at the gates – effectively improving production efficiency. The mould uses S136 high‑polish stainless steel for cavity and core, with hardness HRC 48‑50, ensuring wear resistance and mould life in high‑speed injection environments. SINOMOULD has passed ISO9001, ISO14001, and ISO45001 certifications. All mould components are machined by high‑precision equipment, and each process step is inspected by the quality team before proceeding to the next. Before shipment, trial moulding is conducted on DKM injection molding machines to ensure that the mould will operate efficiently over the long term after arriving at the customer’s factory.

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 core technology independent R&D and integrated innovation capability in the daily chemical packaging mould field, and further consolidates the company’s leading position in the high‑end flip‑top cap mould market.