Plastic Injection Scraper Moulding

Plastic Injection Scraper Moulding refers to functional components produced through the plastic injection molding process, which are used to remove residual substances (such as dust, liquid, powder, viscous materials) from surfaces. Its core structure usually includes a scraper main body (the working end in contact with the surface to be cleaned), a handle connection part (or installation interface), and some styles also integrate auxiliary structures such as reinforcing ribs and anti-slip patterns. Compared with traditional metal scrapers (easy to rust, heavy) or rubber scrapers (poor wear resistance, easy to deform), plastic injection scrapers have the advantages of lightweight, corrosion resistance, and high customization, and are widely used in home cleaning, industrial production, food processing, printing and packaging fields, adapting to cleaning needs in different scenarios (such as flat surface cleaning, groove cleaning, material leveling).

P&M Plastic Injection Scraper Moulding Introduction

A、Core Characteristics of Plastic Injection Scraper Moulding

1. High Precision of Working End and Strong Adaptability

The working end (scraper edge or contact surface) of the plastic injection scraper needs to fit the surface to be cleaned accurately, so the molding precision requirements are strict: through high-precision molds (cavity precision up to ±0.02mm) and closed-loop control injection molding process, the flatness of the scraper working end can be ≤0.1mm/m, and the edge fillet error ≤0.05mm, ensuring no residual dead corners during cleaning. At the same time, the shape of the working end can be customized according to different cleaning scenarios: for example, home cleaning scrapers use curved edges (adapting to curved surface cleaning, such as bathtubs, pot bottoms), industrial production line scrapers use straight edges (adapting to flat surface leveling, such as conveyor belts, printing rollers), and food processing scrapers use round-head edges (avoiding scratching equipment surfaces, meeting hygiene standards), with adaptability far higher than standardized metal scrapers.

2. Wear-Resistant and Impact-Resistant, Long Service Life

Scrapers need to frequently rub against surfaces or contact hard impurities during use, so they have extremely high requirements for material wear resistance and impact resistance: common injection materials (such as PP + glass fiber, POM, PA66) have significantly improved wear resistance after modification——for example, PP scrapers with 20% glass fiber added have a wear rate of only 1/3 of ordinary PP (≤0.002mm³/(N・m)), and can withstand more than 500,000 friction tests without obvious edge wear; POM material scrapers have an impact strength of more than 60kJ/m², which are not easy to break or deform in case of accidental collision (such as falling, hitting equipment), and the normal service life can reach 3-5 years, which is 2-3 times that of traditional rubber scrapers.

3.Lightweight and Ergonomic Design

The low-density characteristics of plastic materials (such as PP density 0.9g/cm³, POM density 1.41g/cm³) make the overall weight of the scraper controlled between 50-200g, much lighter than metal scrapers of the same size (300-500g), which can reduce hand fatigue during long-term use (for example, industrial production line workers operate continuously for 1 hour, and the hand load is reduced by more than 60%). At the same time, the injection molding process can realize the integrated molding of ergonomic structures: for example, the handle connection part is designed into an arc to fit the palm, and anti-slip patterns are added on the surface (the friction coefficient is increased to more than 0.8 to avoid slipping), and some large industrial scrapers also integrate grip grooves or auxiliary handles to further improve operational comfort and stability.

4. Corrosion-Resistant and Compliant with Hygiene Standards

Plastic injection scrapers have excellent chemical stability, and can resist the erosion of common cleaning agents and acid-base solutions (such as household detergent, industrial alcohol, food-grade citric acid solution), without deformation, discoloration or material precipitation after long-term contact, suitable for multi-scenario use: for example, scrapers for chemical workshops can contact weakly corrosive liquids, and scrapers for food processing can contact food raw materials (such as dough, sauce) without polluting the materials. At the same time, food-grade scrapers (using FDA-certified PP and PE materials) have a smooth and non-porous surface, easy to clean and disinfect (can be boiled at high temperature or disinfected by ultraviolet rays), and meet the hygiene standards of the food industry (such as GB 4806.7-2016), avoiding the pollution risk caused by rust of traditional metal scrapers or aging of rubber scrapers.

B、Production Process of Plastic Injection Scraper Moulding

1. Requirement Analysis and Mold Design

First, clarify the core technical requirements according to the scraper's use scenario: for example, home cleaning scrapers need to focus on edge precision (fillet R0.5-R1.0mm) and lightweight (weight ≤100g), industrial scrapers need to emphasize wear resistance (adding glass fiber reinforcement) and structural strength (integrating reinforcing ribs), and food-grade scrapers need to meet hygiene certification (non-toxic materials). Based on the requirements, use CAD software (such as SolidWorks, AutoCAD) to draw the 3D model of the scraper, focusing on designing: the edge angle of the working end (usually 30°-60°, adjusted according to the cleaning material, such as 60° acute angle for scraping viscous materials, 30° obtuse angle for leveling powder), the layout of the main reinforcing ribs (spacing 15-25mm, thickness 2-3mm, improving rigidity without adding too much weight), and the size of the installation interface (such as handle buckle hole diameter error ≤0.05mm, ensuring firm assembly). In the mold design stage, use Moldflow software for mold flow analysis, optimize the gating system (using pin gates to avoid leaving gate marks on the working end) and cooling system (arrange water channels evenly according to the scraper thickness, cooling time controlled at 20-40s to prevent warping), and select P20 pre-hardened steel (small and medium batches) or H13 hot work mold steel (large batches, service life ≥300,000 times) as the mold material.

2. Raw Material Preparation and Injection Molding

Select suitable materials according to the scraper function: PP (low cost, good toughness) for home use, PP + 20% glass fiber (wear-resistant and rigid) for industrial use, FDA-grade PP/PE (hygienic and non-toxic) for food use, and POM (good dimensional stability) for high-precision scrapers. During raw material preparation, mix plastic particles with necessary additives: such as adding antioxidants (0.2%-0.5%, delaying aging) to industrial scrapers, adding anti-UV agents (0.5%-1%, anti-exposure) to outdoor scrapers, and prohibiting toxic additives for food-grade scrapers. The mixed raw materials are put into a dryer (temperature 80-100℃, time 2-3 hours) to remove moisture, avoiding bubbles after injection molding. In the injection molding stage, add the dried raw materials into the hopper of the injection molding machine, and set process parameters according to the material: PP material temperature 180-220℃, injection pressure 60-80MPa; POM material temperature 190-210℃, injection pressure 70-90MPa; glass fiber reinforced PP material temperature 200-230℃, injection pressure 80-100MPa. The injection molding machine injects the molten plastic into the mold cavity through the screw, holds the pressure for 10-15s, then cools and sets, and finally demolds the scraper blank through the ejection mechanism (ejector pin or ejector plate), and removes the gate residue manually or mechanically after demolding.

3. Post-Processing and Quality Inspection

The scraper blank needs targeted post-processing: the edge of the working end needs to be polished (polished with 800#-1200# sandpaper, surface roughness Ra≤0.8μm, ensuring clean and scratch-free); industrial scrapers need surface sandblasting (increasing friction to avoid material adhesion); food-grade scrapers need high-temperature disinfection (boiling at 121℃ for 30 minutes to remove surface oil). Quality inspection is carried out in multiple dimensions:

Dimensional accuracy inspection : Use a coordinate measuring machine to detect the flatness of the working end (≤0.1mm/m), edge fillet (error ≤0.05mm), and installation interface size (tolerance ±0.03mm) to ensure compliance with design requirements;

Mechanical performance inspection : Sample test the flexural strength of the scraper (PP + glass fiber scraper ≥50MPa) and impact strength (POM scraper ≥50kJ/m²) to verify the service life;

Function test : Simulate actual use scenarios, such as testing the residual rate of curved surface cleaning for home scrapers (≤5%), testing the edge wear of industrial scrapers after 50,000 frictions (≤0.1mm), and testing the hygiene compliance of food scrapers (no material precipitation).

Qualified scrapers are packaged (single bagged or bulk packed in boxes to avoid transportation wear) and prepared for delivery.

P&M Plastic Injection Scraper Moulding(Specification)

P&M Plastic Injection Scraper Moulding Feature And Application

1. Home Cleaning Scenario

The core requirements for scrapers in this scenario are light weight, easy cleaning, and adaptation to home curved surfaces. Common types:

Kitchen Cleaning Scrapers : Mostly made of PP material, with an arc-shaped working end (adapting to pot bottoms and sink edges), edge fillet R0.8-R1.2mm (avoiding scratching kitchenware), and anti-slip patterns on the handle connection part. Used to scrape off burnt stains on pot bottoms and residual food residues in sinks, weighing 50-80g, easy for one-hand operation.

Bathroom Cleaning Scrapers : PP or HDPE material (moisture-resistant), with a combined straight-edge + arc design for the working end (adapting to tile planes and bathtub curved surfaces), some with water scraping strips (integrated silicone material, both for water scraping and cleaning). Used to remove water scale on bathroom glass and mold in tile gaps, and can be hung for storage (with hanging holes on the handle).

2. Industrial Production Scenario

Industrial scenarios require scrapers to have high strength, high wear resistance and environmental resistance. Typical applications:

Production Line Conveyor Scrapers : PA66+30%GF material, straight-edge design for the working end (adapting to the conveyor belt plane), thickness 3-5mm (enhancing rigidity), with bolt holes on the installation interface (fixed on the conveyor equipment). Used to scrape off residual materials on the conveyor belt surface (such as ore powder, plastic particles), and can withstand 120℃ high temperature and high-frequency friction.

Precision Electronic Scrapers : POM material, ultra-thin design for the working end (thickness 0.5-1mm, avoiding damage to electronic components), edge precision ±0.02mm, surface polished to Ra≤0.025μm. Used to clean tiny dust and residual photoresist on the surface of wafers and chips, and must be used in clean rooms (avoiding secondary pollution).

3. Food and Pharmaceutical Scenarios

The core requirements of such scenarios are hygiene, safety and compliance. Common types:

Food Processing Scrapers : Food-grade PE or PP material, one-piece molding without splicing gaps (avoiding bacterial growth), round-head design for the working end (preventing scratching of food molds), can be disinfected by boiling at high temperature (121℃, 30 minutes). Used for dough dividing, sauce leveling, and residual cleaning of food molds, complying with FDA and GB 4806.7-2016 standards.

Pharmaceutical Clean Scrapers : Food-grade PP + antibacterial agent (adding 0.5% silver ion antibacterial agent, bacteriostasis rate ≥99%), surface anti-static treatment (avoiding adsorption of drug powder), narrow-edge design for the working end (adapting to the corners of drug powder storage tanks). Used for leveling pharmaceutical powder and cleaning the inner wall of storage tanks, and must be produced in GMP-certified workshops.

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.