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It is very easy to find an injection mould maker, the most simple and effective way is to participate in relevant exhibitions. You will be able to walk around and get a stack of business cards and collect leaflets. Combined my experiences, the key point should be 'appropriate' in choosing a plastic mould maker in China.
Mould Maker
Mechanical processing plants are varying quality. When purchasing higher-cost custom plastic moulds, how to identify reliable injection mould maker for your company?
Steel is a decisive factor of mould quality, a reasonable choice of steel is the most important. Steel selection criteria are:
(1) Moulding Material Requirements
Different plastics product requirement uses different steel, such as the requirement for highly polished, corrosion-resistant and so on;

(2) Price
Steel performance is better to be enough, not better to be expensive. Take into account the cost of injection mould, mold steel should be chosen the appropriate material of the service life, in order to avoid unnecessary waste. Service life of general P20 material is about 300,000; 2738 material is about 500,000; H13/2344 is usually 800-1000 million or more. All these materials can be selected according to the situation;

(3) Surface Treatment
Surface treatment of the injection mould is also very important. Nitride can enhance the surface hardness of steel, effectively extending the life of the mold. Mould steel plating can be effectively modified, some require high brightness and corrosion-resistant plating of plastic parts can be used to enhance and improve the properties of steel.
Collect all basic technical documents from the mould design to finish processing, such as the mission statement, parts diagrams, technical manuals, assembly drawing, mould parts diagram, underlay, mould design specification, inspection records and repair records according to the provisions of systematically sorting, stapling, numbering archived. This seems to be a lot of trouble, but it is very useful for mould maintenance and new mould designing.
Plastic injection mould

Pro/E is predominantly used to design consumer and commercial products other than automotive. In fact automotive is one industry, along with aviation/aerospace, where Pro/E is not the market leader. Pro/E leads in market share in just about every major product category in the US, outside of automotive. SolidWorks has made major inroads into these market segments, but Pro/E still prevails as the market leader for product development (injection moulding, blow moulding, die cast, sheet metal and other manufacturing techniques). From faucets to industrial instruments (lab and portable) to vacuum cleaners to computers (laptop, desktop, servers) to printers to medical equipment to toys to kitchen appliances, Pro/E was the first 3D system in these markets and to this day still holds the market lead. Again, SolidWorks has made major inroads and continues to gain ground on Pro/E. I have always likened Pro/E to VHS not "Betamax", it isn't the best CAD system around but it became the defacto standard for many, eventually DVDs knocked off VHS, so what's beyond Pro/E? SolidWorks or something even better? This is not exactly the best analogy because software isn't tangible and therefore can morph into better software, but Pro/E could get dethroned, so could SolidWorks.
There are many different ways to calculate the an injection mould price, but, they have one thing in common, that is taking efforts to make technical and economic indicators organically combine in order to produce mutual benefits. It will make the injection mould to have competitive prices from the valuation to offer, to contract and to the settlement price.

Empirical Calculation Method
Mould price=material cost + design + process and profit + VAT + tryout cost + packing and shipping cost. Usually in the ratio:
  • Material cost: materials and standard parts accounted for 15%-30% of the total cost of the injection mould;
  • Process and profit: 30%-50%;
  • Design fees: 10%-15% of the total cost;
  • Tryout cost: medium-sized mould can be controlled within 3% while small precision moulds controlled within 5%;
  • Packing and shipping cost: according to the actual or calculated at 3% of the total;
  • VAT: 17%.
Follow the points to select a suitable injection mould manufacturer
  • Do not blindly believe the low purchasing price. Behind the low price, there often hide some invisible traps, like shoddy goods or jerry-built products.
  • Be sure in looking for injection mould manufacturers with complete equipment, and then choose Taiwan, Hong Kong-funded, Chinese domestic, and medium-sized injection mould manufacturers.
  • Finally, I suggest that in the selection of injection mould manufacturers in China, we should base on our own situation and characteristics, in conjunction with the company's various departments to objectively assess, and finally find out a reasonable selection in the demand for positioning of the injection mould and the product is concerned. In this way, your company may reach more satisfactory effect!
Nylon 6 must be dried when it is processed, then you obtain a product without humidity content. Its properties and dimensions will change according to temperature, relative humidity and time. If you maintain the nylon 6 product under standard conditions (50% rel. humidity & T=23ÂșC ) the humidity content may achieve about 3% at equilibrium. The dimensions may increase about 0,7%. This values will be bigger if relative humidity increases.

You can use a climate camera or simply water to make that the nylon absorbs water but you must be careful with the time. The nylon 6 could become softer if you put it to much time into the water. The dimensions of the product could be out of tolerances too. I suggest that you make tests with different conditions and times and then test the product (To check dimensions and properties as the hardness for example).

Online tour of our plastic injection mould making factory in Shenzhen China.
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