Custom Plastic Injection Molding Manufacturer and Factory

  • Free & Fast DFM Feedback

  • No Minimum Order Quantities

  • T1 Samples As Fast As 10 Days

  • 24/7/365 Operation Support
  • Supplier of Stanford AI Lab / TESLA

  • Machines Ranging From 30 Tons to 1,600 Tons

Professional on demand Plastic Injection Molding manufacturing to meet your rapid prototypes and production needs

China Plastic Injection Molding

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How to choose Plastic Injection Molding Manufacturer or Factory

1. First, analyze the product requirements, whether it is a critical part and has special raw material requirements? Including the number, environmental protection materials, pressure resistance, softness and hardness, etc.

2. The injection molding manufacturer must have the right injection molding machine. The right brand and tonnage of injection molding machine are necessary to make good products.

3.Does the injection molding manufacturer have mature design capability, such as product feasibility evaluation, product optimization suggestions, design for manufacturer, mold design, mold flow etc.

4. Does the injection molding manufacturer have the ability to design and make molds in house?
Is the management process of mold maintenance perfect?
Is the injection molding manufacturer’s mold cost appropriate after the mold solution is determined? (Depending on different product requirements, the mold solution is crucial)

5. Does the injection molding manufacturer have any experience in manufacturing similar products with similar materials? If so, it will make the production smoother.

6. Whether the injection molding manufacturer has sufficient injection molding capacity if you’re gonna to place big quantities.

7. Don’t just focus on product design and neglect plastic mold design & manufacturing.

Avoid the collaboration of multiple suppliers and try to achieve one-stop plastic mold making and injection molding production processing.

The Processes of our injection molding factory

See how we process your orders, from quotation to plastic injection molding, as our machines and efficient team ensure you receive your parts within the scheduled lead time and meet your requirements perfectly.

We supply one-stop service from product design, mold manufacturing to injection molding and product assembly.

ABS Injection Molding Processes1

Request Instant Quote

Our dedicated engineers will provide a response within 8 hours, ensuring the process goes on smoothly.

ABS Injection Molding Processes2

DFM analysis

Comprehensive analysis product manufacturability and optimization recommendations for your design.

ABS Injection Molding Processes3

Mold Flow Analysis

Use CAE technology to simulate the real Injection molding process before Injection mold making.

ABS Injection Molding Processes4

Injection Mold Design

Our Molds Last 50% Longer Than Other Molds, They Can Run Up To 15-20 Years In Most Cases.

ABS Injection Molding Processes5

Injection Mold Making

We have our own mold making factory,This will ensure the mold quality of all manufacturing processes. The mold property is yours.

ABS Injection Molding Processes6

T1 Sample Inspection

Few or A dozen samples should be produced for assembly/functional testing before mass production.

ABS Injection Molding Processes7

On-Demand Molding

After the trial plastic molding phase, we start batch plastic molding, which uses powerful machining to manufacture parts at fast rates to save on time and costs.

ABS Injection Molding Processes8

Strict Inspection Delivery

We follow international tolerance standards to ensure our parts meet your requirements, and We have the ability to deliver products anywhere in the world that you specify.

why choose PTS for your injection molding supplier / Manufacturer

Our goal is to put you in the best position to succeed. If you succeed, we succeed.


Response within 8 hours

Weekly project progress report

Review Your Product Design with our injection molding experience

three-person team for your project: professional sales, project manager, and mold engineer.

Rich experience

20 Years Of Injection Molding Experience

 6000+ Injection Molding Projects Delivered

Quality manufacturing

99.75% on-time product delivery rate
99.15% Product qualification rate

Competitive price

Save customers an average of 35.37% compared to their previous suppliers

No Minimum Order Quantities

Small order accepted
Complex designs accepted

As fast as you want

8.2 days for TESLA prototype injection molding at 11/2021,other factories need 13 days.
14.6 days for FORD medium volume injeciton molding production at 05/2022, other factories need 25days.

Smooth communication

No layers of bureaucracy, PTS’s medium size allows you to deal directly with the factory owner.

Our sales are transferred from project manager who speak good english and will never make you feel difficult to communicate with our injection molding factory, Professional in injection molding.


You’ll work with good value plastic injection molding Manufacturer / Supplier just like them…


    Worry about our quality? See what our  happy customers said about our products/services.
    You will LIKE us once you started with us!

    “PTS always can quickly find a solution for any complex Manufacturing situation. With their capacity, quality, and knowledge, PTS can help any company achieve its goals.”

    Fan from USA, Purchasing Director

    “In manufacturing, reliability is everything. That’s what we get from PTS industrial Ltd and they have also reduced our rejects by up to 90%. If all our equipment worked as well…our jobs would be easier, and our customers would be very happy”

    Fren - BMW Germany , Project Manager

    “We started using engineering parts around 10 years ago from PTS. We have always received excellent parts from every batch, timely replies to all our queries, and very competitive quotes and make us more competitive in the market.”

    Michael from USA, General Manager

    Plastic Injection Molding Manufacturer—Get Instant Quote Now !

    No Matter Where You Are, We’ll Turn Your Idea & Design To Reality.

    PTS is your China partner, your China researching and developing team, your China OEM ODM Plastic Injection Molding manufacturer / Plastic injection molding factory.

      1. Injection molding product testing and inspection at injection molding factory

      1.1 Inspection methods of injection molding products at our injection molding factory

      1.1.1 The principle of product qualification

      A) Does not affect the application of the product to the end user.

      B) Does not interfere with post-process or customer assembly and processing.

      C) Does not affect aesthetics.

      D) Reliability

      1.1.2 The concept of First article inspection, in-process quality control and Finished product inspection(FQC)

      ●First article inspection

      A) Purpose: to make the injection molded components meet the design and customer requirements and prevent batch scrap.

      B) The first inspection time is before each production batch, after material change, after exception handling(mold repair, insert changed, ejector pin changed).

      C) Note for the first inspection:
      Before sending the first inspection, the workshop technician must do a good self-inspection:
      check whether the product matches the drawings and other requirements, especially pay attention to structural issues; color matching; no obvious injection defects in appearance; Check assembly and functionality (especially new products, mold repaired, insert changed, ejector pin changed, injection parameters changed).

      ●in-process quality control

      A) Purpose: timely detection of abnormalities in the injection modling process to prevent batch scrapping.

      B) The inspection time is 3 shots per each machines per each two hours.

      C) Note for the in-process quality inspection:
      Support operation and production trouble shooting solution in many ways, such as machine, material, operator, method, management factors, to identify abnormalities, analysis of abnormalities, to solve abnormalities

      ●Finished product inspection(FQC)

      A) Inspection timing: the injection modling workshop has produced finished products, placed them in the area to be inspected, and the operator informed the quality inspection guys.

      B) Sampling standards: Sampling according to customer requirements; sampling according to enterprise specifications if customers do not require.

      C) Inspection includes labeling, material, appearance, size, assimilability, and packaging etc.

      1.2 Inspection standards of injection molding products at our injection molding factory

      1.2.1 Inspection environment

      A) room temperature 20℃±2, humidity between 30%~80% (no condensation).

      B) Place the product under 40W fluorescent lamp or 60W ordinary light bulb 0.8~1m position, in 45°~135° direction, both eyes 30~45cm from the product,The visible face stays 3~5s, and the other face 2~3s.

      1.2.2 Product inspection level classification

      Ⅰ: Products refer to products that do not require painting, such as DVR, wall box cover, satellite switch glue tray, PHLIPS antenna and other products for indoor use with high surface requirements;

      Ⅱ: Products refer to products that require painting and outdoor products.

      1.2.3 Classification of products in different positions

      A-Surface:The part that is visible during normal product operation, such as the top cover, front end and interface area.

      B-Surface:The surface that is not often visible in normal product operation, such as the side of the product.

      C-Surface:Tthe surface that is not visible in normal operation, such as the bottom of the product.

      D-Surface:The non-exposed surface of the product structure, such as the inner surface of the product and the internal structural components.

      1.2.4 defects level of injection moulded products

      Fatal defects (Grade A)
      Defects that can cause harm or be unsafe to the product user.

      One or more fatal defects are called fatal non-conforming products; such products should be strictly limited (not allowed to leave the factory) to eliminate the defect. If the user finds a fatal defective product, you can reject the (batch) of products.

      Due to fatal defects caused by user losses and hazards, injection molding factory will not only lose their reputation and cause great economic losses but also bear legal responsibility.

      Serious defects (B level)
      Although it will not constitute the same consequences as fatal defects, it will not cause harm to the user. Still, it can cause failure or seriously reduce the product’s performance, greatly reducing its expected function.

      One or more serious defects, not including fatal defects in the product, is called a serious non-conformity.

      Minor defects (Class C)
      Only a slight impact on the application of the product performance or almost does not constitute a defect.

      One or more minor defects without fatal defects and serious defects of the product are called minor non-conforming products.

      There are also quality defects according to the severity of the four levels: fatal, serious, general, and minor.

      1.2.5 Classification of defects in injection molding product inspection

      Material defect:
      Wrong material, mixed material, unconfirmed large proportion of Sprue material (Serious defect).

      Minor appearance defects:
      Scratches, shrinkage, material flow mark, color difference, ejector mark etc on the B and C surfaces of Ⅰ level products and A, B and C surfaces of Ⅱ level products.

      Serious appearance defects:

      Scratches, shrinkage, material flow mark, color difference, ejector mark, welding line that affects assembly etc on the A surfaces of Ⅰlevel products and Ⅱ level products.

      Product construction (assembly) defect:

      Resulting in product not being assembled or failure to achieve the expected function,For example: serious misalignment of the upper and lower covers after assembly, mismatch of the screw teeth, cracking after locking the screw,etc.

      Product performance defects:

      Defects that cause the product failed to meet the expected function of the design. For example: paint peeling, plating plating off, steel hardness, strength failure, electrical connection breakage, short circuit, attenuation reflection is not up to standard, etc.

      Packaging defects:

      May cause the product to appear scratches or not implemented according to the requirements of the corresponding packaging materials protective film, plastic bags etc.

      1.2.6 General judgment principles

      A) During the molding process of injection molded parts, we inspect the products and control the production with the concept of “zero defect”, and help the molding workshop to analyze the root causes of each defects.

      B) If there are minor defects in the appearance of the produced injection molded parts, but the customer agrees to accept them and they do not affect the assembly, we can say OK.

      C) Defective products causing poor assembly (hole cracking, difficult to locking screw, scorching, deformation affecting assembly, large joints, fracture, fastening is not tight, misalignment etc) shall be rejected.

      1.2.7 Inspection techniques for injection molded parts

      Surface appearance:
      ●Surface without burrs, welding lines, bubbles, flow marks, deformation, scratches.
      ●No Color difference (pay attention to the check assembled parts).
      ●No any marks/issues at gate position.
      ●No Flash around parting lines, insert lines.

      Product structure:
      ●No plugging, hole (big or small), deformation, whitening, welding line at screw hole position.
      ●There should be no cracks or fractures in the joints.
      ●Go NO GO thread gauge required, pin gauge required.

      Test assembly, functional and spraying.

      2. Injection Molding Manufacturer Preparation work before starting up molding machine

      2.1 Close the main power switch of the injection molding machine, check whether the equipment is electric leakage, preheat the barrel and mold according to the set process temperature, and keep warm for more than 20min when the barrel temperature reaches the process temperature to ensure the uniform temperature at the whole barrel.

      2.2 Open the oil cooler to cool the water valve, returned oil and water pipeline, and start up the oil pump, if no abnormalities are found, then official start of the oil pump; wait until the screen shows “motor on” before starting to rotate, pay attention to the motor reversal, check whether the role of the safety door is normal.

      2.3 Manually start the screw rotation and check the sound of the screw rotation is not abnormal and jammed.

      2.4 The operator must check whether the safety door is normal. If the safety door travel switch is not working, it is forbidden to start the machine, and it is strictly forbidden to operate without using the safety door (cover) (emphasize to the staff).

      2.5 The operating equipment’s electrical, hydraulic, and rotating parts should be covered and fixed with various covers and guards.

      2.6 No one is allowed to press the buttons and handles without permission, and no two or more people are allowed to operate the same injection molding machine simultaneously.

      2.7 Place the mold and insert to be stable and reliable. Stop immediately if any abnormality is found in closing the mold, and inform the technical personnel to troubleshoot.

      2.8 When repairing the machine or cleaning the mold for a longer period (more than 10min), make sure to back off the injection barrel so that the nozzle leaves the mold and turn off the motor; The operator is not allowed to leave work while the maintenance personnel are repairing the machine.

      2.9 No one is allowed to start the motor when someone is handling the machine or mold.

      2.10 The power must be cut off when the body enters the machine or when the mold is open.

      2.11 Avoid hitting the mold with the injection seat when the mold is open to prevent the mold from falling off.

      2.12 Generally, each injection should not exceed 5s When inject it outwards. If the injection does not work twice in a row, pay attention to informing the neighboring personnel to avoid the danger zone.
      When cleaning the injection nozzle, do not allow direct hand cleaning, using iron pliers or other tools to avoid burns.

      2.13 The barrel has high temperature, high pressure and high electric power in the working process, it is forbidden to step on the barrel, climb and put objects on the barrel to prevent burns, electric shock and fire accidents.

      2.14 In case the hopper is not fed, do not use metal bars or rods to stab the hopper roughly to avoid damaging the screen, screen guard and magnet frame inside the hopper, which will easily cause serious damage to the equipment if the metal bars are caught in the barrel when the screw is rotating.

      2.15 If the machine is found to have abnormal sound, odor, sparks, oil leakage and other abnormalities in operation, it should be stopped immediately and reported to the relevant personnel of injection molding factory, explaining the fault phenomenon and possible causes.

      The injection molding manufacturer should teach the staff to strictly comply with the above matters to ensure safe production and smooth production, so as to ensure quality and quantity delivery to customers

      3. Special measures for injection molding of white or transparent products

      To strictly control the black spots on the surface of moulded plastic parts, improve the quality of moulded products, reduce the waste of raw materials and labor, and reduce costs, our plastic injeciton molding factory can develop preventive measures in our injection molding factory as follows:

      We apply these experiences to automotive, medical, electronic, white household appliances etc industry,

      3.1 The injection molding manufacturer should thoroughly clean the residual material or dust in the grinder or mixer before grinding or mixing the material.

      3.2 When the plastic injection molding factory is playing material, if there is a contaminated or black spot on sprue material or scrap products, it must be picked out (such as: clean oil, air gun blowing off dust, etc.) before grinding. It is strictly prohibited to grind the wrong material or mixed material.

      3.3 After all the materials are ground or mixed and put into the material bag, the injection molding factory must seal the material bag in time and mark it well.

      3.4 All the plastic bags or tools for material must be cleaned thoroughly by the injection molding factory.

      3.5 The injection molding manufacturer should keep the material grinding and mixing place clean and dust-free, the mixing machine should be covered at any time, and the material at the material gate should be cleaned in time and the material gate should be closed.

      3.6 The baking barrel must be cleaned, the air inlet should be wrapped with dustproof cloth to prevent dust from entering the baking barrel.

      3.7 The injection molding factory needs to clean the dust outside and bottom of the material bag before feeding material,If there is raw material left in the bag after feeding, the bag should be sealed in time.

      3.8 Injection molding plant’s hopper material is not allowed to add too full, and should always cover the hopper cover tightly to prevent the dust in the air fall into the hopper.

      3.9 Clean the foreign matter and dust in the sprue box before loading sprue material or waste products.

      3.10 When opening the mold and adjusting the machine in the injection molding factory, it is strictly forbidden to use dirty hands to get the product and the sprue, the injection molding factory must put on clean gloves or wash your hands before getting them.

      3.11 Products and sprues with oil or black spots must be placed separately from clean scrap or sprues, and the injection molding manufacturer must pay attention to the fact that they are not mixed together.

      3.12 All the bad products (including sprue material) which are contaminated or have many black spots must be treated as black material or scrap, and the black spots in the larger plastic parts should be picked out with a knife before putting them into the spouting plastic barrel.

      3.13 When the sprue material or scrap (including products) falls on the ground, it should be picked up and wiped clean (or blown clean) in time, and it is strictly forbidden for anyone to throw the contaminated (black spot) sprue material or products into the clean sprue rubber bucket.

      3.14 When the sprue or scrap parts are full of a basket/bucket, it should be ground into sprue material in time, when it is too late to grind, it should be covered with a plastic film bag.

      3.15 Do a good job to clean the machine and wash the bubble when the machine is on/off, to prevent the raw material in the barrel from charring due to high material temperature or too long time of heat.

      Usually transparent or white injection molded parts require a high level of management for the injection molding company, because any small detail failure will result in the production of products with black spots or impurities that do not meet the requirements.

      We have more than 20 years of plastic injection molding factory experience, and we have very rich experience in this kind of high requirements of transparent or white injection molded parts, and we can provide you with transparent or white injection molded parts very well at our precision plastic injeciton molding factory.

      Get A Quote on Plastic injection molding manufacturer Factory and design analysis today