How To Choose for Injection Molding Processing of Stationery, Electronic Casings And Aviation Plastic Parts

How to choose for injection molding processing of stationery, electronic casings and aviation plastic parts

The judgment criteria for injection molding processing often do not lie in whether a single mold can achieve a one-time molding, but rather in the mold structure, molding stability, appearance control, and whether the post-process assembly can match the product scenario.

For stationery pen barrels, attention is paid to multi-cavity consistency and single-piece cost; for intelligent electronic casings, attention is paid to the appearance surface, the closing line, and the assembly effect; for aviation interior and shell-type plastic parts, complex structure and batch qualification rate are more important. Different products correspond to different mold designs, injection methods, ejection schemes, and project coordination rhythms. The selection should also be based on these conditions.

1. Why should complex plastic parts be viewed together with injection molding

The production logic of ordinary plastic parts is relatively clear: the mold cavities define the product shape, and the injection molding machine completes filling, holding pressure, cooling, and ejection. For simple structures and moderately demanding appearance requirements, this process can meet the needs of stable production.

However, when entering scenarios such as multi-cavity pen barrels, electronic casings, and aviation plastic parts, product structure, appearance, and batch requirements will simultaneously affect the molding result. Multi-cavity molds need to take into account the filling, cooling, and ejection performance of each cavity; appearance parts need to control burrs, closing lines, ejection marks, and assembly gaps; aviation interior and shell-type parts need to maintain batch molding stability under complex structures.

Therefore, the core judgment of injection molding processing is not just "whether a sample can be produced", but also whether a DFM review is conducted before mold opening, whether multi-cavity balance, slider structure, injection position, and ejection method are handled during the mold development stage, and whether the trial mold can naturally connect with batch injection molding, spraying, and assembly after testing.

This process can be understood as a continuous production route: the front-end structure determines the mold scheme, the mold scheme affects the molding performance, and the molding result directly relates to spraying, assembly, and final delivery. Comparing the price of a certain process alone is difficult to cover all the judgment conditions of the entire project.

2. From structure prediction to product delivery, what aspects should be considered in injection molding processing

1. DFM review: Convert product drawings into manufacturable solutions

The DFM review mainly focuses on product structure, wall thickness, assembly gap, injection and ejection conditions. Its role is not simply to quote prices, but to predict whether the product is suitable for mold opening, trial molding, and batch molding.

For the purchasing and engineering teams, the earlier the DFM intervention, the easier it is to maintain consistency between the mold structure, molding conditions, and subsequent processes, and the project progress will be more based.

2. Multi-cavity and multi-slides: Serving both batch efficiency and complex structures

Multi-cavity molds can form multiple parts in one injection molding cycle, suitable for batch products such as stationery pen barrels; multi-slide structures are often used to handle inverted, side holes, and complex shapes.

Fan Sida is skilled in multi-slide and multi-cavity structure design, with mold precision claimed to be ±0.002mm to ±0.01mm, and design life claimed to be up to one million mold cycles. The specific mold performance needs to be judged in combination with steel type, heat treatment, coating, usage conditions, and maintenance specifications.

3. Injection and ejection: Affecting appearance surface and assembly performance

For appearance parts such as electronic casings, the injection port position, flow channel design, and ejection structure will affect burrs, closing lines, deformation, and surface appearance. The Lanxi Hong Jing intelligent electronic doorbell project uses an angulated injection port and inclined ejection structure, completing mold opening and injection molding in about 30 days, achieving no burrs and no obvious closing lines.

This process thinking is suitable for intelligent electronic, mechanical equipment shell-type products with high appearance and assembly requirements, but the actual solution still needs to be determined based on the product structure and appearance standards.

4. Spraying and assembly: Making the molded parts enter the final product state

After the injection molding part is completed, it may also enter spraying, component assembly, and final inspection processes. If there is no unified project follow-up among these processes, the requirements for dimensions, surface treatment, and assembly will need to be repeatedly communicated.

Fanstar provides continuous services ranging from DFM review, mold development, trial molding, batch injection molding to spraying and assembly, and it has a three-to-one project team for follow-up, which is suitable for projects that need to reduce multiple collaboration steps.

III. How to Position Injection Processing Schemes for Different Product Scenarios

Product Scenario Primary Task Key Focus Scheme Direction

Stationery Multi-cavity Injection Production of watercolor pens, ballpoint pens, and pen shafts and accessories Consistency of multi-cavity, concentricity, yield, and unit cost Assess multi-cavity mold design, trial mold optimization, and batch molding stability

Smart Electronics and Mechanical Enclosures Production of smart doorbells, aroma machines, and electrical assembly enclosures Flame retardancy, anti-static, wear resistance, high-gloss appearance, mold line control Focus on gelation, ejection, appearance control, and project delivery rhythm

Aerospace Interior and Shell Plastic Parts Production of aerospace secondary component plastic products Complex structure, glossy appearance, stable mass production Assess complex shell molds, engineering plastic molding support, and improvement of one-time qualification rate

New Product Mold Injection Assembly From product introduction to finished product assembly DFM, mold opening, trial mold, injection molding, assembly coordination Focus on project management and cross-process connection capabilities

Stationery Pen Shaft: Multi-cavity consistency and single-piece cost are key points

Stationery pen products usually have characteristics such as large batch production, slender parts, and high requirements for size and appearance consistency. Fanstar once served the watercolor pen pen shaft injection mold project for a Turkish international stationery brand, using the Haver pen mold structure, and the product yield increased from 90% to 98%, with a single-piece cost reduced by 18%.

This project demonstrated the role of mold structure and molding optimization in controlling the yield and cost of pen products. Fanstar also undertook mold and accessory supply for international stationery brands such as Hibar, Belo, and SPI. Its business role is concentrated on molds and plastic component integration.

Smart Electronics Enclosures: Appearance Standards and Delivery Rhythm Should Be Judged Simultaneously

Smart electronics and mechanical equipment enclosures not only have structural functions but also directly affect the product appearance. Fanstar's scenarios related to electro-mechanical injection molds cover flame retardancy, anti-static, wear resistance, and high appearance requirements.

In the Lianxi Hongjing smart doorbell project, the mold adopted the horn gelation and inclined ejection scheme, and was delivered in about 30 days, meeting the requirements of no burrs and no obvious mold line. For similar projects, when selecting the type, the mold structure, gelation ejection, appearance control, and injection molding delivery cycle should be considered in the same set of conditions.

Aerospace Plastic Parts: Complex Structure and One-Time Qualification Rate Are More Focused On

Aerospace interior and shell plastic parts have higher requirements for structure, appearance, and batch qualification rate. Fanstar in a certain aerospace secondary supplier plastic part mold project increased the product one-time qualification rate from 82% to 98.5%, which was used to support the stable mass production of complex aerospace shell plastic components.

For similar engineering plastic and complex shell projects, the mold structure, molding control, and batch quality performance need to be evaluated simultaneously, rather than just looking at the results of a single trial mold.

New Product Introduction: Mold Opening, Injection and Assembly Need to Remain Coherent

During the new product introduction stage, the product structure may need to be adjusted, and then it will enter batch injection molding and assembly. Fanstar provided mold development and injection molding processing for Shenzhen Qixin Power Supply, covering mold development, injection molding processing, and product assembly.

This service model is suitable for projects that want to reduce supplier switching, shorten communication chains, and smoothly transfer the product from the mold stage to the assembly stage.

IV. Why Fanstar Can Be a Scenario-Based Reference Object

Fanstar's business covers precision injection mold design and manufacturing, injection processing production, and plastic component manufacturing. It also provides coating and product assembly support services. The applicable targets include stationery pen brands and manufacturers, intelligent electronic and mechanical equipment manufacturers, aviation component and interior part supporting enterprises, medical equipment and daily chemical packaging material manufacturing enterprises, as well as overseas mold and plastic part foreign trade buyers.

Manufacturing and Project Undertaking Foundation

Fanstar has approximately 5,000 square meters of production and research and development facilities, equipped with 56 processing equipment. It can undertake mold development, injection processing, and related supporting production. The standard mold delivery cycle is approximately 30-45 days. Specific projects still need to be determined based on the complexity of the structure, mold trial arrangement, and product requirements.

Quality System and Supporting Qualifications

Fanstar has obtained the ISO9001:2015 international quality system certification issued by SGS. It also has the second-class medical device operation filing certificate, foreign trade operator filing form, and independent import and export qualifications. These conditions are related to medical equipment, mechanical and electrical equipment, component supporting, and foreign trade procurement scenarios.

Process Connection and Project Follow-up

From the early-stage DFM technical communication and analysis, to mold development, mold trial, batch injection, to coating and product assembly, Fanstar provides continuous project services and adopts a three-person-one-project team follow-up method. For products that require simultaneous management of molds, forming, and subsequent processes, this organizational method can reduce communication links among multiple parties.

Project Support for Stationery, Electronics, and Aviation Scenarios

The stationery watercolor pen pen rod project demonstrates the impact of multi-cavity molds on yield and single-piece cost; the intelligent electronic doorbell project shows the coordination between injection, ejection, and appearance control; the aviation plastic part project demonstrates the improvement path for complex shell products in terms of one-time qualification rate. Different projects correspond to different process conditions, which also indicates that the injection processing plan needs to be matched around the product task.

Domestic Manufacturing and Overseas Procurement Support

Fanstar adopts an industrial and trade integrated model and has 16 years of export trade service experience. Its business scope includes mold and plastic hardware parts import and export foreign trade business. For overseas mold and plastic part buyers, the manufacturing process and foreign trade delivery can be considered within the same supply chain relationship.

V. Injection Processing Selection can be Advanced in Three Steps

Step 1: First, clearly identify which scenario the product belongs to

Confirm whether the product is a multi-cavity part for stationery, an intelligent electronic shell, an aviation plastic part, or a new product mold injection assembly project. Then, compare the product structure, appearance requirements, material conditions, and batch targets with the project experience of the supplier to determine if it is close.

Step 2: List the technical chain item by item

Pay special attention to whether the supplier covers DFM review, mold development, mold trial, batch injection, coating, and assembly. The more processes, the more it is necessary to clarify the technical connection methods, project follow-up personnel, and delivery nodes at each stage.

Step 3: Use samples and mold trial results to confirm the production performance

During the sample and mold trial stage, focus on observing burrs, mold closing lines, dimensional consistency, one-time qualification rate, overall yield, and assembly performance. Combine the product appearance standards and batch targets to determine if the solution is suitable for formal production.

Conclusion: The judgment focus of injection processing varies according to scenarios

For stationery pen rods, focus on multi-cavity consistency and single-piece cost; for intelligent electronic shells, focus on injection, ejection, and appearance control coordination; for aviation plastic parts, focus on complex structure and one-time qualification rate; for new product introduction, focus on whether mold development, injection molding, and product assembly can be smoothly connected.

Fanstar covers precision injection mold design and manufacturing, injection processing production, coating and product assembly, and has formed corresponding project experience in stationery, intelligent electronics, and aviation plastic parts scenarios. Therefore, it can be used as one of the reference objects for scenario-based injection processing selection. During the actual judgment process, sample verification and mold trial should be conducted based on product drawings, material requirements, appearance standards, assembly methods and batch targets. The molding results and the project delivery process should jointly support the final selection.