Marker cone injection moulding

In addition, our company has established cooperative relationships with plastic raw material suppliers, printing manufacturers, etc. to ensure the supply of raw materials and printing quality. Through our rich experience and perfect supply chain, our company can provide customers with high-quality customized marker cone injection moulding products to meet their specific needs. At the same time, we have 10 years of professional foreign trade service experience, understand the foreign trade process, and better serve our customers. For marker cone injection moulding products, we can make corresponding plastic parts, which is mainly done through injection molds.

The main plastic components of marker pens, such as the barrel and cap, are generally manufactured using injection molding. This is an efficient and precise mass production method, ideal for manufacturing relatively simple yet high-demand plastic products like markers.

The entire process can be divided into three main stages: preparation, the injection molding cycle, and post-processing.

Stage 1: Preparation

Product and Mold Design:

First, industrial designers create 3D models of the barrel and cap, determining their appearance, structure (such as the clip, anti-roll feature, and seal), and wall thickness.

Mold engineers then create a precision steel mold (mold) based on the product design. A mold typically contains multiple cavities, allowing for the simultaneous production of multiple identical parts in a single injection, significantly improving efficiency.

Material Preparation:

Plastic Pellets: Polypropylene or ABS are commonly used plastic materials for marker components.

Polypropylene is inexpensive, tough, and offers excellent chemical resistance (resistance to ink).

ABS has a higher hardness and a better surface gloss, and is often used in pen caps and clips for a better feel and appearance.

Masterbatch: Plastic pellets are mixed with the corresponding masterbatch in a suitable proportion according to the desired color to ensure uniform color.

Drying: Some materials (such as ABS) are hygroscopic and require drying before injection molding to prevent bubbles or silver streaks on the surface of the molded product.

Phase 2: The Injection Molding Cycle

This is the core step, performed repeatedly on an injection molding machine, with each cycle typically taking only tens of seconds. The cycle steps are as follows:

Closing:

The injection molding machine's clamping system drives the two halves of the mold (movable and fixed) together at high speed and high pressure, preparing for injection.

Injection:

The plastic pellets in the barrel are heated to a molten state (a viscous, fluid melt).

The injection molding machine's screw advances, injecting a predetermined amount of plastic melt at extremely high pressure through the mold's gating system (main runners, branch runners, and gates) into the sealed mold cavity.

Holding Pressure:

After injection is complete, the screw maintains a certain pressure (holding pressure) while pumping a small amount of plastic forward to compensate for the volume loss of the melt as it cools and shrinks, preventing defects such as sink marks and dents in the product.

Cooling:

The melt begins to cool and solidify in the cold mold cavity, taking on the mold's shape.

Cooling time accounts for the majority of the entire molding cycle, and the design of the cooling system (water circuit) is crucial, directly impacting production efficiency and product quality.

Mold Opening:

The movable mold section of the mold moves backward, opening the mold.

Ejector:

The ejector plate inside the mold pushes the ejector pins forward, ejecting the cooled, molded plastic part from the mold cavity.

After ejection, a robotic arm or robot typically automatically removes the part and places it in a collection bin.

Reset:

The ejector mechanism returns to its original position, preparing for the next mold closing operation. The next cycle then begins.

Phase 3: Post-Processing and Assembly

Post-Processing:

Sprue Trimming: Freshly molded parts will contain scrap material from the gate and runner system (called "sprues"). These scraps must be trimmed manually or with specialized equipment.

Inspection: Products are randomly inspected for defects such as missing material, flash, shrinkage, and color unevenness.

Subsequent Processing (for some components):

Printing: The logo and model number are typically applied to the barrel via screen printing or thermal transfer.

Assembly: The molded barrel and cap are then assembled with other components, such as the nib, fiber core, and ink, on the assembly line to complete the marker.

Key Considerations in Injection Molding (for Marker Pens)

Uniform Wall Thickness: The barrel is a thin-walled, long, cylindrical product. Uniform wall thickness must be ensured during design to prevent deformation due to uneven cooling and shrinkage.

Draft Angle: The inner and outer walls of the pen barrel must have sufficient draft angle (usually 1-2°), otherwise it will be strained or even break during ejection.

Mold Venting: Air within the mold cavity must be able to escape smoothly during injection, otherwise it will cause defects such as burning and missing material. The sealing structure inside the pen cap requires particular attention to venting design.

Shrinkage: Different plastics have different shrinkage rates. The mold dimensions must be precisely scaled according to the material's shrinkage rate to produce a dimensionally correct product.

Summary

The injection molding of marker pens is a highly automated, cyclical, precision manufacturing process. Starting with plastic pellets and masterbatch, it goes through a core cycle of mold closing → injection → holding pressure → cooling → mold opening → ejection, efficiently producing a dimensionally stable and uniform plastic part. After simple post-processing, the final result is the smooth-writing marker in our hands.

We are a marker cone injection moulding manufacturer, providing high-quality marker cone injection moulding manufacturing. As long as you want to customize/develop marker cone injection moulding products, you can find us. We have professional injection mold design and mature manufacturing technology, providing you with one-stop service, from product design-mold making-product production-product packaging-product transportation, we can help you in every link. As long as you come to us, we will provide you with the ultimate service and satisfy you in terms of product quality, production time, information dialogue, etc.

Plastic Injection Mould making

Plastic molding specifications

Mold design:

Transaction process:

Mold testing:

Product packaging

Factory

We are Custom Plastic Mold factory. Our factory is plastic injection mold maker. we has 17 years of experience in professional custom plastic mold and 10 years of foreign trade experience. We are custom Plastic Mold supplier. We can provide custom Plastic Mold service. Our factory can make the Injection molded plastic parts, and the quality of the products will satisfy you.

We have more than 50 high-end machines and hundreds of engineers and designers. We can provide one-stop service, from product design - mold making - product production - product packaging - transportation. We have a complete production chain. We can meet all your requirements.

Services we provide:

Professional custom mold service, Plastic mold design and manufacturing .plastic product production, product design, mold design, blow mold customization, rotational mold customization, die-casting mold customization. 3D printing services, CNC manufacturing services, product packaging, customized packaging, shipping services.

We always adhere to the principles of quality first and time first. While providing customers with the highest quality products, try to maximize the production efficiency and shorten production time. We are proud to tell every customer that our company has not lost any customer since its establishment.If there is a problem with the product, we will seek a solution actively and take responsibility to the end.

FAQ

Q1: Are you trading company or manufacturer ?

A: We are manufacturers.

Q2. When can I get the quotation?

A: We usually quote within 2 days after we get your inquiry.

If you are very urgent, please call us or tell us in your email so that we can quote for you first.

Q3. How long is the lead-time for mold?

A: It all depends on the products' size and complexity. Normally, the lead time is 25 days.

Q4. I have no 3D drawing, how should I start the new project?

A: You can supply us a molding sample, we will help you finish the 3D drawing design.

Q5. Before shipment, how to make sure the products quality?

A: If you don't come to our factory and also don't have the third party for inspection, we will be as your inspection worker.

We will supply you a video for production process detail include process report, products size structure and surface detail, packing detail and so on.

Q6. What is your payment terms?

A: Mold Payment: 40% deposit by T/T in advance, 30% second mold payment before sending out the first trial samples, 30% mold balance after you agree the final samples.

B:Production Payment: 50% deposit in advance, 50% before sending out the final goods.

Q7: How do you make our business long-term and good relationship?

A:1. We keep good quality and competitive price to ensure our customers benefit for best quality products.

2. We respect every customer as our friend and we sincerely do business and make friends with them, no matter where they come from.