Plastic Injection Pencil Sharpener Moulding

Plastic Injection Pencil Sharpener Moulding refers to a stationery product that produces core components such as knife shells, knife holders, and chip storage boxes through plastic injection molding processes, and cooperates with metal blades to achieve pencil cutting functions. Its core feature is using the injection molding process to realize the integrated or modular molding of pencil sharpener components. The knife shell and chip storage box mostly adopt a snap-on structure (assembly gap ≤0.1mm), with light overall weight (10-30g), small size (diameter 30-60mm, height 20-40mm), and strong drop resistance (no breakage when dropped from a height of 1.5m). Compared with traditional metal pencil sharpeners (heavy, easy to rust) or wooden pencil sharpeners (easy to wear, small chip storage capacity), plastic injection pencil sharpeners have the advantages of low cost, flexible design (can be made into cartoon shapes, multi-color splicing), and large chip storage capacity (5-10 pencil chips). They are widely used in student stationery, office stationery, children's educational toys and other fields, adapting to the cutting needs of various types of pencils such as HB, 2B, and 2H.

P&M Plastic Injection Pencil Sharpener Moulding Introduction

1 Core Characteristics of Plastic Injection Pencil Sharpener Moulding

1. Multi-Component Modular Molding, Convenient Assembly

Integration/Separation Adaptation of Knife Shell and Knife Holder: Basic pencil sharpeners adopt integrated injection molding of knife shell and knife holder (reducing 2 assembly steps), and the knife holder has a built-in blade installation slot;  complex models adopt a split design, and the knife holder is connected to the knife shell through a buckle;

Quick-Detach Structure of Chip Storage Box: The chip storage box and knife shell adopt a rotating buckle or pressing buckle design. The rotating buckle can be opened by rotating only 30 °,  and the pressing force of the pressing buckle is 5-10N, which can be easily operated by children;  the bottom of the chip storage box is designed with anti-slip texture to avoid slipping when opening;

Precise Blade Positioning: A blade fixing hole is reserved in the knife holder during injection molding, and the metal blade is fixed by screws or buckles. The blade cutting angle deviation is ≤1 °, ensuring the sharpness of pencil cutting.

2. Precise Matching of Material Properties, Balancing Durability and Safety

Different components have significant differences in material performance requirements, so targeted selection is needed during injection molding, with particular attention to child safety:

Knife shell and chip storage box: They should be drop resistant, odorless, commonly made of PP or ABS, meet the GB 6675-2014 toy safety standard, and be free of harmful substances such as phthalates; Make rounded corners on the surface to avoid scratching children's hands with sharp edges;

Knife holder: High rigidity is required to fix the blade, and fiberglass reinforced PP is selected for long-term use without deformation; Wear resistant treatment should be applied to the contact area between the knife holder and the blade;

Decorative components (such as cartoon shapes): Made of soft TPR or PVC (Shore hardness 30-40 degrees), integrated with the blade shell through two-color injection molding, with a soft touch, enhancing children's interest in use, and no risk of detachment (peel strength ≥ 10N/m).

3. Small-Size High-Precision Control, Adapting to Pencil Cutting Needs

The size of the pencil sharpener component is small, and injection molding requires strict precision control to ensure stable cutting function:

Pencil entry hole accuracy: The diameter of the entry hole is designed according to the pencil model, with a tolerance controlled within ± 0.1mm, to avoid pencil shaking caused by a large aperture or sticking caused by a small aperture; Chamfering the edge of the entrance hole to guide the smooth insertion of the pencil;

Sealing performance of chip storage box: The bonding surface between the chip storage box and the tool shell adopts a stepped sealing structure to prevent pencil shavings from leaking out of the gap during the cutting process.

II Production Process of Plastic Injection Pencil Sharpener Moulding

1. Product Design and Mold Development）

(1) Product Design

Structural design: Draw a 3D model using CAD software, with a focus on designing the thickness of the blade shell, the size of the pencil inlet hole, and the clip structure of the chip storage box

Mold material: P20 pre hardened steel or H13 hot work mold steel is selected for the blade shell and chip storage box molds; The knife holder mold uses S136 stainless steel to fix the blades

Mold cavity design: Multiple mold cavities (16-32 cavities for the blade shell mold and 24-48 cavities for the chip storage box mold) are used, with a symmetrical circular layout to ensure uniform filling of each cavity;

Cooling system: Arrange the cooling water circuit according to the shape of the components, and control the cooling time within 8-15 seconds to ensure that the components are quickly shaped and free of internal stress.

2. Raw Material Preparation and Injection Molding

(1) Raw material pretreatment

(2) Injection molding

3. Assembly and Quality Inspection

P&M Plastic Injection Pencil Sharpener Moulding(Specification)

P&M Plastic Injection Pencil Sharpener Moulding Feature And Application

1. Student Stationery Scenario

Core Requirements: Safe and durable, easy to operate, cost-effective, suitable for daily use by students aged 6-15 (cutting 3-5 pencils per day).

Product Features:

Food-grade PP is used (no odor, no harmful substances), and the edge of the knife shell is rounded R1mm to avoid scratches;

Single-hole or double-hole design (adapting to HB/2B, 2H pencils), chip storage box capacity ≥5 pencil chips, no frequent cleaning;

Bright colors (red, blue, yellow, etc.), some with cartoon patterns (such as anime characters, animal shapes) to enhance students' interest in use;  low price (1-3 yuan/piece), suitable for bulk purchase.

2. Office Stationery Scenario

Core requirements: efficient cutting, large chip storage capacity, simple appearance, suitable for office workers.

Product features:

The knife holder is made of fiberglass reinforced PP (with strong rigidity and stable blade fixation), with smooth cutting channels and a cutting force of ≤ 3N, making it easy to cut;

The capacity of the chip storage box is ≥ 10 pencil shavings, with a transparent design (using transparent PP or ABS), making it easy to observe the amount of shavings and clean them in a timely manner;

The appearance is simple (mainly white and gray), with a compact size that can be placed in an office pencil case without taking up space; Partially equipped with anti slip base (TPR material), it is not easy to slide during cutting.

3. Children's Educational Toy Scenario

Core requirements: Safe and non-toxic, fun looking, highly interactive, suitable for children aged 3-6, with both cutting function and educational properties.

Product features:

The material selected is a soft TPR+PP composite material (wrapped in TPR for the blade shell, with a soft touch and no damage from falling), certified by the EU CE, and has no sharp parts;

The design is for animals (such as bears and rabbits) or transportation vehicles (such as cars and airplanes), and the opening method of the chip storage box is rotation or pressing, which exercises children's hand coordination ability;

Customization Process

Factory&About US

NingBo Plastic Metal Product Co.,Ltd (P&M) is located in Yuyao, the so-called Mould City, Plastic Kingdom, in the southern tip of Hangzhou Bay Bridge,north of Shanghai, the east of Ningbo Port,tight double line of State Road 329 on land, sea and air trafic into a network to facilitate transport.

By the abundant technical strength,scientific management methods and good after-sales service, product deeply trusted and welcomed by customers from all over the world. P&M holds improved system of development and production, to achieve mold design, plastic products manufacturing and automatic production. Our main products is design and manufacturing of plastic mold, plastic product, metal product. 90% products of our enterprise are exported to America, Europe, Germany, Japan, Australia, etc. For many years, the company has been committed to the research of raw materials. The company has its own trademark and dozens of patents, providing more convenient technical support for mold making and product production. P&M started domestic business from 2008,named Shundi Mould Factory. And opened the international market from 2014. 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.

P&M adheres to market-oriented to the quanlity of life and focus on quality service and continuous development of new products,determined to establish a better corporate image,and our friends at home and abroad to carry a wide range of business exchanges and cooperation, create brilliant.

Packing

Packaging according to your needs

1. By air ,it takes 3-7 days for delivery.

The goods can be shipped by DHL , Fedex , UPS .

2. By sea ,the delivery time is based on your port.

To South East Asian Countries takes about 5-12 days.

To Middle east countries takes about 18-25 days.

To European countries takes about 20-28 days.

To American countries takes about 28-35 days.

To Australia takes about 10-15 days.

To African countries takes about 30-35 days.

P&M Bike parts, centered around children, balances safety, health, and fun, aiming to add a bright color to children's beautiful childhood. We look forward to working together with you to serve our children.

The path of a child's growth is paved with bricks and tiles.

FAQ

1.Who are we?

We are based in Zhejiang, China, start from 2014,sell to North America(30.00%),Southern Europe(10.00%),Northern Europe(10.00%),Central America(10.00%),Western Europe(10.00%),Mid East(10.00%),Eastern Europe(10.00%),South America(10.00%). There are total about 51-100 people in our office.

2.How can we guarantee quality?

Always a pre-production sample before mass production;

Always final Inspection before shipment;

3.What can you buy from us?

Mould, Plastic Product, Metal Product, Dental Product, CNC machining.

4.Why should you buy from us not from other suppliers?

We main do all kinds of 3d design, 3d printing and plastic metal molds tooling and products. We have our own engineer and factory. One-stop supply: 3d design - 3d printing - mold making - plastic injection.

5.What services can we provide?

Accepted Delivery Terms: FOB,CFR,CIF,EXW,FCA,DDP,DDU;

Accepted Payment Currency: USD, EUR;

Accepted Payment Type: T/T,L/C,PayPal,Western Union,Escrow;

Language Spoken:English,Chinese,Spanish,French,Russian.

6.What are the characteristics of your service?

1. Your inquiry related to our products or prices will be replied within 24 hours.

2. Well-trained and experienced staffs to answer all your enquiries in fluent English.

3. Offering the support to solve the problem in the application or selling period.

4. Competitive prices based on same quality.

5. Guarantee samples quality same as mass production quality.