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High quality mold material

As you known, material is the foundation of the mold, mold 's high quality should be guaranteed by the high quality material firstly. Aiming at the different characteristics, we adopted different material for different mold parts:

  • Core part and cavity part: Stainless steel(Sweden S136)
  • Neck part: High grade nitrogened steel
  • Mold plate: 52# steel
  • Guide bar and guide cover: 20CrMo
High precision tooling

We have advanced CNC equipment and various kinds of high precision mold tooling machine.
For Mold plate: The surface is machined through imported grinding machine,which will guarantee the parallel grade between the plates.
For guide bar 's hole: This part is machined through numerical boring machine or CNC(numerical milling machine),which will guarantee the high running precision of mold plates.
For core part and cavity part: After rough lathing, the parts will be tooled on high precision numerical lathing machine, which ensure the preform 's shape and size as the same as our design exactly.
For cylinder and material mouth-sealing bar: The cavity of cylinder will be machined through inner-round grinding machine,and the material mouth-sealing bar will be machine on high precision coaxial outer-round grinding machine, thus our material mouth-sealing bar can run stably driven by the outside air pressure, at the same time, and the working life is prolonged.
Advanced heat treatment technic

The steels' inner structure will have some different change under different heating or cooling condition, through which we can enhance the performance of material. And during the tooling course, the changing is effectively to eliminate the cutting stress, accordingly our workpiece can get the excellent using performance.

Plate: Heat treatment is very important for mold, especially for the large mold(such as 24 cavities,32 cavities and 48 cavities). As well-known, the mold plate might be transformed under the high temperature condition as 300¡æ in the gross it will swell about 0.45mm per 100mmm. In order to decrease the swelling, we will do the valid heat treatment on our mold plate, some manufacturers have neglected this to decrease the tooling cost.

Core part¡¢Cavity part: High performance of the two parts is crucial since they will touch the high-temperature melting PET material. Our heat treatment on core and cavity include eliminating the stress during tooling process and the hardening treatment on the surface, which can avoid the transform and decrease the wearing.

Guide bar¡¢Guide cover: Firstly we choose the suitable material to make the bar and cover, and we will do the quenching treatment on the surface, as a result, the hard degree is very high, which will decrease the wearing during the mold opening and closing. At the same time, the inner structure has remained, the bar will hold the excellent toughness and will not break.

Neck part: Also the neck part will touch the high-temperature melting pet material directly, and in order to ensure the smooth doffing, the neck part will be opened through the slipping block during each mold opening course. So the requirement on neck part is very high, it should get the suitable hard degree, generally we will do the nitrogened treatment on this part.
No-tail design

Our hot runner preform injection mold adopted piston sealing system, the technology is from German HOSTET, easy operation and excellent effect are the main characteristics. The main principle: after the injection and pressure-holding process, the small cylinder, driven by the pneumatic system, will drive the material mouth-sealing bar to seal the material input mouth, then the preform will be cooled in the mold, after doffing from the mold, there will not be the tail on the bottom of the preform; along with the new cycle starting, the material mouth-sealing bar will draw back, and the melting material can be injected into the mold again.
Advanced hot runner system
In order to keep the melting state of the PET material in the mold, we should heat the hot runner plate, furthermore, we should keep the temperature stable strictly, so the nice temperature controlling system is crucial. For the main hot runner plate, we adopt the heating stick (heater) to heat, the heater is made of special steel and with excellent heat conduct ability, so the PET material will get the equal heating effect; for the distributing plate, we adopt the small nozzle structure and will use the hearing ring to heat the nozzle, there is an independent temperature controlling system for each cavity to control the heating ring's temperature, so you can adjust the temperature of each cavity respectively.
Independent Self-lock structure

The cooling effect will take the direct influence to the productivity, so the cooling system is also a crucial part of injection mold. There are three parts of the cooling system in our mold: Heating plate cooling, Core part cooling and the Cavity cooling part. Under the precondition of high strength, the cooling channel was designed to adequate large, we use our 24 cavities and 32 cavities mold as an example, the diameter of the main flow channel reaches to 25mm and the diameter of the distribution flow channel reaches to 10-12mm. You can understand our cooling system through the attached sketch.
Strict test and inspection
After the first assembly, each set of our mold will pass through the strict test and inspection, including the cooling channel 's proof performance, the weight of the preform, the eccentricity, the temperature controlling effect etc., if there is any problem, we will make the adjustment till all of the performance reach the standard.

And we know the customer purchase the mold is to produce high quality preforms then blow nice bottles, so we will test the finish preform on our blow molding machine, to see if we can get the nice bottle blowing effect, the feedback will be useful for the injection mold 's building and customer 's real production.

1) We will design the preform aiming at your requirement.
We can design the preform for the standard bottles, such as water bottle, carbonated drink bottle, oil bottle etc.
Also we have enough experience in designing the preform for special shape bottle, such as the wine bottle, wide mouth jar etc.
Advanced software have been chose, such as AutoCAD, Pro/E, Solid Work, UG etc.

2) In order to let customers to replace the easy-wearing parts, we will send enough free spare parts along with each set of mold:

  • One set of Core
  • One set of Cavity
  • Neck parts
  • One set of heaters
  • One set of heating rings
  • Voltage meter

3) One year 's warranty. If you find there is any parts damaged during the normal running condition, we will send the free spare parts to you. Wrong operation or contrived problem do not include.

4) Along with the mold, we will send you the detailed instruction, in which you can learn the mold installation, the mold testing and running, safe working, how to solve the normal problems etc. Also we will record the test result in the instruction book.

5) Timely tech-support. If you have any question or find any problem, just tell us, our engineers will give you timely solving suggestion.

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