2-in-1 Open-End Pin Box Injection & Connecting Machine Overview  

The HTD83-SQV is an electrical, fully automatic 2-in-1 machine that combines pin box injection molding and connecting into a single process for plastic zipper open-end production. It is positioned after hole punching and slider mounting, and before final packaging – making it a critical step that determines the strength and durability of the finished pin box (the plastic insert at the open end of the zipper).

By integrating two separate operations, this machine streamlines the production line, reduces handling time, and ensures consistent quality.

2-in-1 Open-End Pin Box Injection & Connecting Machine 

2-in-1 Open-End Pin Box Injection & Connecting Machine Application Scenarios 

The HTD83-SQV is a core piece of equipment in open-end zipper manufacturing:

Open-end zipper production – injection molding of pin boxes and connecting to form the finished open end

arment manufacturing – jackets, coats, jeans, and other outerwear

Luggage & handbags – backpacks, suitcases, travel bags

Outdoor equipment – tents, sleeping bags, and other high-durability applications

It is typically used together with zipper gapping machines, film sealing machines, hole punching machines, and slider mounting machines to form a complete automated open-end zipper production line.

2-in-1 Open-End Pin Box Injection & Connecting Machine Working Principle  

The HTD83-SQV operates on a fully automatic electrical control system powered by a PLC (Programmable Logic Controller). The machine integrates two core functions – pin box injection molding and connecting – into one continuous process.

Injection Molding Unit – Plastic material (resin or Delrin) is heated to a precise melting temperature and injected into a custom-designed mold cavity that sits directly on the zipper tape. The PLC controls injection pressure, temperature, holding time, and cooling cycle to ensure each pin box is formed with consistent dimensions and strong bonding to the tape.

Connecting Unit – After the pin box is molded and solidified, a mechanical connecting mechanism (driven by electric servo motors) automatically joins the one side tape with one side slider together of the open-end zipper, completing the assembly.

The entire process is synchronised by the PLC, which coordinates feeding, positioning, injection, cooling, connecting, and ejection with high precision and repeatability.

1. 2-in-1 Integrated Design – Saves Space & Labour

The machine performs both pin box injection and connecting in one unit. Compared to traditional separate machines, it reduces floor space by approximately 40% and eliminates intermediate material handling – one operator can now do the work that previously required two.

2. Fully Automatic Electrical Control – Stable & Precise

Equipped with a PLC control system, the machine precisely regulates injection temperature, pressure, and timing. The electric drive offers faster response, higher accuracy, and lower energy consumption than pneumatic alternatives.

3. Supports #3 to #20 Plastic Zippers

#3 through #20 plastic zippers (including Delrin, resin, and Vislon), covering the most common sizes used in garments, luggage, and outdoor gear .

4. High-Precision Injection – Secure, Durable Pin Box

Precision injection molds and high-quality core components (PLC, bearings, motor) ensure that the molded pin box bonds firmly to the zipper tape, preventing loosening or detachment – significantly improving the finished zipper's durability.

5. Stable Output – 700 Pieces per Hour

With an average production capacity of 700 pcs/hour, the machine is ideal for medium to large-batch continuous production.