Plastic injection mold making

CNC machinie

China plastic injection molding solution

Plastic injection molding productWe will talk about a few details to have the plastic molded products manufacturing in China. We will have a few guides here to help you to do China plastic injection molding. You will also know the advantage and disadvantage to have the plastic manufacturing in China. Then you can choose to have China plastic injection molding or not have China plastic injection molding.

China plastic injection mold manufacturing

We should talk about the cost for China plastic injection mold making first, the mold cost including the steel cost, mold base, manufacturing cost and labor cost.


China plastic injection mold steelPlastic moulds steel

There are lots of subsidiary company of the worldwide sale plastic mould steel in China such ASSAB, DAIDO and SCHMOLZ+BICKENBACH etc. Normally the mold steel you can bought in North America and Europe, you can also buy in China.

Also China have lots of qualified plastic mould steel supplier such as LKM, Baosteel, HBIS and Fushun Special Steel etc. These steel factories also have long term history and biggest steel factory in China. Normally they have more exhibition to instruct their products, they did not have lots of experience to sale the steels on the web. To be honest the steel factory’s customers is normally not on the web.  So the consumer in North America and Europe did not understand the China mold steel factory.

Normally the China local mold steel is commonly and widely used for very large plastic injection mold manufacturing for automotive mold manufacturing and large consumption goods etc.

You can download mold steel list and review more information on our injection plastic mold steel and plastic injection mold base page.

China plastic injection mold base

Pin point gate injection mold base

China have one of four mold base manufacturer LKM founded on 1975. Most of plastic injection mold importer from Europe and North America should be know this company very well.  In LKM, they offer standard mold base as LKM standard, also they can offer custom standard plastic mold base. But the custom mold base is much more expensive than the LKM standard, this is the reason why there is lots of custom mold standard mold base supplier in China.  More than 30 years developing of modern  mold industry in China, there are lots of qualified China mold base company, China mold steel company and China mold manufacturers as well as professional mold industry practitioners.


Plastic injection mold manufacturing machineCNC machinie

In China there is also easy to import the high technique mold manufacturing machine such CNC, EDM machine and low speed wire cutting machine wordwide machine company. In China including Taibei, there are a lots qualified plastic injection mold manufacturing machine such as TopeEDM , YCM , Victor CNC and Takisawa CNC etc.

In China mainland, there are also lots of CNC machine supplier such as SMTCL CNC and Harvest Star etc.

Plastic injection mold manufacturing labor cost

As China education developing, there are more and more university student join into the plastic injection mold and plastic product manufacturing engineering. There is more worker to compete with the others to get the mold company mold engineering position. The month salary today is reduced 50% compare to the the engineering month salary on 2000. The salaries of the EDM, CNC machine and wire cutting machine operation and technician is also reduced a lot accordingly.

But you heard that China salary is increased every year, why above is not the same. Yes, you are right, the common worker and operator’s salary is increased every year, but this is not the technician to manufacture injection mold.

China plastic injection mold quality

From a few decades development, China mold manufacturing is very full-blown industry in the world, the quality is very competitive. There is also four major mold manufacturing industry location in China. Zhejiang province import and join into the mold manufacturing and plastic product development, but the Guangdong province make the plastic injection mold manufacturing quality much more stable, and make the mold manufacturing with large standard manufacturing  and produced lots mold industry technician.


Plastic injection mold shipping from China to international

Today, the plastic injection mold shipping is most advantage than before. In China and HongKong, there are lots shipping forwarder handle the shipping service for manufacturers. Also your local market also have lots of shipping forwarder coordinate with China shipping forwarder to handle the shipping.

The plastic mold shipping is very convenience for all of manufacturers and importer. You just need to find the forwarder to prepare the goods, the commercial invoice and custom declare and cleaning document, sure you should check the shipping progress with express company or shipping forwarder.

Plastic molds and plastic products shipping solution

China plastic injection mold manufacturing advantage and disadvantage

I think you should have a clue for advantage and disadvantage once reading above China plastic injection mold manufacturing. Anyhow as the internet developing, the plastic injection mold manufacturing and plastic product manufacturing competition is not between China and USA and China and Europe etc. It is global competition, every injection mold factory in the world who have the on-line marketing, then they will be the competitor with you. It is not that you would not like to purchase oversea, it is that you should have your plastic products with competition in the world.  As my point of view, I think all of the Country have the good and competitive mold factory, you just need to choose the mold manufacturers suitable for you.

China mold manufacturing advantage is not just on the plastic injection mold manufacturing factory, is also based on China education, China plastic injection mold manufacturing machine, China culture and China open and reforming development etc. It is like a compositive competition.


China plastic injection molding solution

I think you should be interested if you have China plastic injection molding or not and if there is advantage. We should also consider the cost, lead time, quality, communication and service etc. Then we will talk about this.

China plastic injection molding cost

China plastic manufacturing solutionWe should the plastic injection molding cost including the resin cost, labor cost, injection mold machine cost( unit cost per shot) scrappage and package cost. Then we should calculate the molding cost from these coefficient.

Plastic injection molding resin cost

Different get the plastic resin with different resin cost.

  •  The difference is from different resin cost supplier,
  • Different tax to take and difference VAT to undertake and return(this just affect the plastic molding for the production that you will use more than one ton resin)
  • Use same plastic resin but different brand, you did not specify this.
  • Use different resin to quote but you did not specify this
China plastic raw material manufacturerChina plastic molding solution

There are lots of China plastic raw material supplier such as Chimei, you can use these resin if it will not affect your plastic product quality, these resin can be cheaper than the resin from North America and Europe.

Also there are lots of resin supplier have the production base in China such as SABIC, Polyone and LG etc.  All of these make the plastic resin is similar or cheaper than the resin in North America and Europe.

 China plastic injection molding machineChina plastic injection molding solution

There are also lots of China plastic injection molding machine supplier such as HaiTian, Yizumi and Chenhsong etc. They offer reasonable and high quality plastic injection molding machine. This is also the advantage of China plastic injection molding.


China custom plastic molding supplier

Turnkey solution to control plastic injection molding tolerance

There are lots of people are talking about that how to control the tolerance for plastic molding. I combine my experience with a few exporter who have more than 20 years experience for molding industry. I hope following information will be very useful for you.

What will affect the plastic injection molding tolerance

  • Plastic injection molding resin
  • Mold manufacturing & injection molding project management including engineers, sales & communication etc.
  • Plastic injection mold machining accurate
  • Mold design concept
  • Molding parameter
  • Injection molding machine quality including brand, local or import one
  • Injection molding machine selection including machine size, screw diameter, injection volume and clamping force etc.
  • Quality control including inspection of mold components, electrode and plastic products

First of all we talk about the mold manufacturing & injection molding project management

Lots of people miss to control this on the plastic product tolerance. This is first process we should control the tolerance. We should control from the samples if you are mold factory, if you are mold or plastic product buyer, you should control this on the information offer process.

What we should offer to mold manufacturing factory and molding factory or ask from buyer to control the tolerance?

Plastic product 2D drawing: There should be tolerance label for all of the dimensions. This is target what customer need to reach. If you have surface finishing and secondary process for this products, please offer this information on the 2D drawing. Also please throw away the habit to talk to your mold manufacturing supplier for this kind of requirement on email. If not, you have risky to have your supplier to miss information if the one you are working have no good project management.

Plastic product 3D drawing : Have this drawing to provide to your plastic mold maker, then they check the details of the plastic product on the drawing. Also if your good and professional mold supplier limited on the capability, they will reply you.

I suggest you to read plastic injection mold life on our blog to know more about that the mold life for the tolerance and cost. Normally the accurate mold should be made with through hardness core and cavity. Please offer mold life for mold manufacturer.

Above process is to control the plastic product tolerance during the quotation, this is the communication process, and is the basic process to have tolerance under control.

How SEASKYTOOLING to control the tolerance on the quotation process?

  • Lessons for all of the salesman to understand what we should ask from customer
  • what we should ask based on different customers
  • We clean individual cases up during our service, use this to help you and our salesman
  • We have easy understanding form to collect customer demand to our CRM
  • Professional engineers coordinate with salesman to check and study the information from you
  • Also most of salesman have mold engineer experience

Based on above, we make sure we can get the enough information from you to proceed the quotation and assure you have no risky to miss the tolerance control.

Control the tolerance on different plastic resin

This is one of most important process to control the tolerance.  Different resin on injection molding with different dimension even if it is the same injection mold due to different resin with different shrinkage.

For the POM, PP and PE etc resin, they have big shrinkage, it is more difficult to control tolerance than PC, ABS, Nylon with glass fiber and PC/ABS etc. Normally PC, ABS and ASA etc. plastic resin with shrinkage lower than 6 ‰ is easier to control a few dimensions with +/-0.02 mm, assure it is possible to control to more accurate tolerance for a few dimension. We do not suggest to use the high shrinkage resin to have accurate plastic parts.

Control the tolerance on plastic mold design process

This is one of whole process to check the information provide by customer and manufacture the information on plastic mold design and input on plastic mold factory for mold manufacturing. Your mold supplier should consider following for the mold design and even more than these:

  • Plastic resin shrinkage
  • Plastic product gate location
  • Safe steel for accurate dimensions
  • Use the inserts as possible for the accurate dimensions
  • Use the inserts as possible for the easy breaking feature of mold
  • Consider the suitable injection molding machine
  • Learn the plastic resin specification and input this on the mold design
  • Consider the molding parameter during the mold design
  • Prepare the solution to prevent the deform, short shot, burning etc. common issue during injection molding
  • Mold designer have full check list to check the mold design even if you think you are very  professional
  • Run the mold flow to test the mold design and plastic product design
  • Optimize the mold design and plastic product design

Control the tolerance on plastic mold manufacturing process

  • Choose the right process to manufacture plastic mold components
  • Inspect plastic mold components including the electrodes and mold inserts
  • Assure the plastic mold components is accurate
  • Relieve the stress for the large mold core, cavity or mold plates after manufacturing
  • Measure the plastic mold components and record
  • Inspect plastic products dimensions after injection molding trial and record
  • Measure deviated dimensions on the mold after mold trial. Find the clue to improve the dimensions on the mold
  • Choose the right injection machine according to your injection mold including choose the right screw of injection machine based on the resin and plastic part, clamping force, injection volume, Min-Max mould thickness and ejector stroke etc.
  • Record the molding parameter during mold trial, not only the parameter on the injection machine. You should also record the mold temperature, test the actual temperature of mold and set up temperature of injection machine.

Plastic injection molding tolerance control

If the mold is released for mass production, you should also control the tolerance of the injection molding parts. First of all you have to control the whole dimension, at least you should measure the biggest length,width and height of product. If this have no big change, this means your injection parameter should be correct probably.

Give more importance on the first 100 shots once you start the production. Once the mold running a few hours, the parameter should be not the same, you should check the tolerance, this is the reason why we suggest to check large size and accurate dimensions each hour. Please noted the mold trial is different as the production. Even if you got a good shot on mold trail, it is not the case you can get a good shot on long time production. Please check and record, you will learn lots of information.

Also you should measure the accurate dimension at least per hour to make sure it is correct. You can measure it more frequent based on your production quality control.

You should also check the following things during injection molding

  • Plastic injection molding parts color
  • Plastic injection molding parts surface finishing
  • Plastic injection molding parts small feature including ultrasonic welding line, small bosses, small posts and small ribs etc.
Custom plastic molding suppliers

Custom plastic molding supplier

Custom plastic molding suppliers

SEASKYTOOLING is China Custom plastic molding supplier working for custom plastic injection molding manufacturing and plastic mold manufacturing for medical device, automotive, medical, telecommunications, electronics, computer, industrial, biomedical, construction and consumer industries etc.

Plastic injection mold manufacturing in China Custom plastic molding supplier SEASKYTOOLINGChina custom plastic molding supplier


  • Free Charge of DFM analysis with plastic mold quotation, you will have manufacturing solution during your plastic injection mold inquiry process.
  • Reply your plastic injection molding manufacturing and plastic mold manufacturing inquiry within 12 hours.
  • Mold flow analysis before the plastic mold design and plastic injection mold manufacturing to find out all of the possible issue to prevent
  • Weekly report with picture for plastic mold manufacturing, you will understand the plastic mold manufacturing progress each week with clear picture and time line
  • Mold trial report with video to record, molding parameter, plastic injection molding product dimension report
  • Replied all of your emails during the plastic mold manufacturing and plastic injection molding manufacturing within 24 hours, generally you will get back answer in one working day.
  • Most of engineers in SEASKYTOOLING worked for plastic mold industry more then 10 years
  • Working for western plastic mold manufacturing and plastic injection molding manufacturing more than 14 years
  • Details plastic mold manufacturing document to offer if you need the injection mold to do production in your plant
Document for plastic mold

Document for plastic mold

Plastic injection molding manufacturing in China Custom plastic molding supplier SEASKYTOOLINGCustom plastic molding supplier

  • Various color as per your samples or RAL, or Pantone for plastic injection molding manufacturing plastic product
  • Specializing in thermoplastic injection molding with all type of thermoplastic including ABS(with glass fill), Polystyrene, Polypropylene(with glass fill), Polyethylene(with glass fill), Polystyrene, Acrylic,, Acetal, Nylon(with glass fill), PBT(wih glass fill), ASA, PVC, CPVC, UPVC, PC(with glass fill), PC/ABS, PPS, PPA, Elastomers, PPO, POM etc.
  • Surface finishing for custom plastic molding manufacturing parts: Texture(Mold Tech, Yick-Sang etc.), silk-screen printing, painting and plate etc.
  • Custom package or bulk package are welcome

Plastic injection molding and plastic mold manufacturing trade term in China custom plastic molding supplier

  • EXW,
  • FCA ShenZhen,
  • FOB ShenZhen,
  • FOB HongKong,
  • CIF,
  • DDU
Mould making

Mould making

SEASKYTOOLING is professional China plastic injection mould making factory working for  custom plastic injection mould making and custom plastic injection moulding. We are making moulds for plastic injection enclosure, plastic bracket, plastic cover and the other various plastic parts for medical device, automotive, medical, telecommunications, electronics, computer, industrial, biomedical, construction and consumer industries etc.

It is more convenience for you to move to our product showcase and our study case to learn our plastic product manufacturing and mould making capability.

All of the custom plastic injection mould making and custom plastic injection moulding  inquiries, we will reply within 12 hours.

We can offer both domestic mould making and export mould making

Mould making

Mould making

Domestic mould: The mould leave in China for production, we call them as domestic mold.

Export mould: The mould should be exported to your plant for production, we call them as export mold

What is most of difference in SEASKYTOOLING for plastic injection mould making?

We only handle the plastic injection mould within our capacity, not yes man to accept to do everything.

Offer the DFM analysis during the mould quotation process to have you know the possible issue on the product design.

Offer mold flow analysis report for each of plastic injection mould

Build customer archives to offer custom service for each customers.

Give importance on staff learning and study


Send us China mold supplier SEASKYTOOLING plastic mold inquiry now