I. GIỚI THIỆU NOZZLE MÁY ÉP NHỰA

1. Nozzle máy ép nhựa là gì?

The nozzle for an injection molding machine, also known as the injection nozzle, is the component attached to the cylinder. The connection between the nozzle and the cylinder comes in two types, depending on the specific design of the cylinder.

+ Directly mounted using either a bolted joint or a threaded connection.
+ Indirectly mounted via a nozzle adapter, meaning the nozzle is attached to the adapter, and the adapter is then connected to the cylinder.

Tham khảo thêm bài viết về Nozzle Adapter và Xi lanh máy ép nhựa.

Tác dụng chính của Nozzle (đầu phun) là dẫn dòng nhựa nóng chảy đi vào khuôn. Nozzle tiếp xúc trực tiếp với phần bắt đầu của khuôn.Ngoài ra tùy theo trường hợp cụ thể mà còn có các thêm tác dụng khác như:

• Trộn nhựa (Mixing nozzle): When the produced product has a color (other than black, white, or clear), the issue of uneven mixing of colorants with the plastic can lead to inconsistent color in the final product. The nozzle plays a key role in mixing the plastic and colorant to ensure uniform color distribution and consistent product appearance. Mixing nozzle will create a swirling molten plastic flow, which helps to mix the colored plastic more evenly and improve the color stability of the product. To address the issue of uneven color mixing and color streaking, ASG offers the solution of using a mixer nozzle. These mixer nozzles are typically designed to be cleaned without disassembly, and the cleaning process is done by purging with new polymer. Thanks to the optimized nozzle design, there are no residues or dead zones, ensuring that the plastic and colorant mix completely after just a few injection cycles. This effectively prevents unnecessary material loss and reduces the time needed to clean the plastic in the machine.

• Shut-off nozzle: The shut-off nozzle is different from a standard nozzle because it can block the flow of molten plastic when not injecting. It is suitable for use with low-viscosity plastics that are prone to leaking from the nozzle. With years of design experience, ASG will consult with customers and provide the most optimal design for each type of injection molding machine. There are two types of shut-off nozzles: self-adjusting and externally adjustable.
  1. Self-Adjusting Nozzle: The injection needle is kept in place by a spring pressure, which closes the nozzle. When the injection pressure increases, the molten plastic pushes the needle backward, opening the nozzle. Once the plastic inside the nozzle reaches a certain pressure, it successfully pushes the needle back. As a result, there will be a minimum pressure required to overcome the spring force and open the nozzle. When the nozzle opens, the pressure will decrease, and the spring-driven needle will close the nozzle hole.
  2. Externally Adjustable Nozzle: The nozzle is opened by an external force, independent of the plastic flow pressure. The nozzle's shut-off function is controlled hydraulically or pneumatically. These types of nozzles have various mechanisms to stop the flow. Since they operate independently of the plastic flow pressure, they can be used for a wide range of applications such as pre-melt compression, physical and chemical foaming, and high-speed injection molding.

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2. Cấu tạo Nozzle máy ép nhựa

Tùy theo hãng máy và nhu cầu sử dụng mà đầu phun máy ép nhựa lại có các thiết kế khác nhau, dạng cấu tạo hay gặp sẽ có:

• Một đầu ren để vặn vào Adapter hoặc Xilanh.
• Một đầu côn tròn để áp sát vào phần khuôn.
• Lỗ dẫn nhựa.
• Vị trí lắp cảm biến.
• Lục giác để có thể kẹp cờ lê, mỏ lết vào để vặn.

3. Phương pháp lựa chọn vật liệu chế tạo Nozzle

Tùy thuộc vào tình trạng NG mà sản phẩm đang gặp phải hoặc loại nhựa sử dụng mà lựa chọn phương pháp chế tạo cũng như vật liệu chế tạo Nozzle cho máy ép một cách phù hợp.

Thông thường vật liệu sẽ được sử dụng là SKD61, SAMC645, tuy nhiên với các nhựa có cấp độ chống cháy cao (nhóm free halogen) thì cần phải lựa chọn các loại hợp kim tăng cường thành phần Crom để tăng khả năng chống ăn mòn kim loại.

II. NOZZLE MÁY ÉP NHỰA CÔNG TY ASG

1. Introduction

• We manufacture all types of nozzles for injection molding machines according to customer specifications.
• Sản xuất theo yêu cầu sử dụng như: Đầu phun có chức năng trộn – Mixing nozzle, Đầu phun đóng ngắt – shutter nozzle,…
• Size
  Diameter from D14mm –  D150mm
  Maximum length 600mm

3. Product supply process

Step 1: Please send us a quote request including the following information:

• Full model name or model photo
• Component diameter and length specifications.
• Use plastic models or plastic packaging photos to select appropriate materials and component manufacturing technology.

Step 2 ASG Vietnam sends quotation to you.

Step 3: Customer send order.

Step 4: In most cases we have manufacturing drawings, in some cases we do not have drawings, we will come to your factory to measure and create drawings.

Bước 5: Production and product quality control according to ISO 9001:2005 standards.

Bước 6: Free delivery and installation for customers.

Bước 7: Payment of order value.

4. Warranty Terms

• All products of ASG Vietnam company are warranted 1 for 1 within 12 months for manufacturer's defects.
• We provide free 24/7 consultation on plastic injection molding machine screw cylinder issues. Our consulting team consists of experienced engineers combined with technical department heads of large molding factories.
• Periodic testing for customers using ASG Vietnam components.

ASG screw cylinder – quality creates trust