4230 Asenovgrad, Bulgaria

(00 359) 878 77 88 24 office@krestoni.com


Product Development (Design-Engineering)

We offer designing of a brand new product from the first idea to the final product. The stages include:


  • Clarification / idea creation according to the client requirements;
  • Determination of the key highlights of the product;
  • Creating a wide variety of concepts, presented by sketches for discussion with the client;
  • Choosing the best and its development;
  • Applying basic design principles for harmonious proportion, shaping, color combinations, etc., If the product and the customer require it;
  • Implementation of engineering computer simulations and analyses to determine the optimum shape, size, material, technological processing, part locations, checking for collisions with other elements of the assembly and etc;
  • Photorealistic renderings of the future product;
  • Rapid prototyping (3D print, milling and turning machining) if the part allows it;
  • Testing of prototypes or zero series in licensed and certified laboratories providing testing protocols. The tests include both destructive and non-destructive testing;
  • Production of the final product depending on its nature, if our technological capabilities allow it.
A graphical form with the product development process can be viewed below. ---------------------------------------------------------------------------------------------------
In addition to developing the entire product, we can offer you the design of tooling as a complete project with the required design documentation ready for production.
Besides developing of plastic parts, we can also offer you developing of metal products. We work in partnership with CNC metal machining companies including turning, milling and electro-erosion processing, as well as test laboratories and rapid prototyping companies (3D print), as we can offer you prototype testing, zero series, and regular series destructive testing with the required protocols after the test.


We offer computer simulations and analyses of new and existing products on request.


  • Structural and deformation static analyses using computer simulations by applying a wide range of materials;
  • Nonlinear analyses;
  • Dynamic and motion simulations;
  • Thermal-flow analyses. Fluid interaction with the environment – heat transfer analyses, velocity of fluid, pressure change and others.
  • Moldflow analyses, which includes determining the optimum regimen for filling a specific part (determining the gating system location WTBC, optimal pressure injection molding, during molding, cooling time, total cycle time, pressure retention etc.).
  • Fatigue analyses under specific load conditions;
Our Plastic Flow Simulation Department is specially dedicated to injection mold filling and it is staffed entirely by long-term synthetic polymer professionals and provides in-depth analysis to improve the quality of injection molded parts as early as the design stage, prior to the physical execution of the injection molds, such as way aims to significantly reduce the cost of production and dealing with subsequent problems.

Shape and topology optimizations

We offer optimizations of existing products by customer requirements, aimed at reducing the weight while maintaining strength, leading to increased profits for the manufacturer.


  • Optimizing the shape and dimensions of the parts using computer analysis. The result is a reduced mass and dimensions while maintaining the strength;
  • Optimizing by replacing or modifying the material;
  • Optimizing by changing or modifying manufacturing technology;
  • Optimization of processes in injection molding of plastic parts;
  • Optimize and / or adjustment of parts for injection molding of plastic or processing by semi-stamping technology of parts made by aluminum alloys.

Plastic injection moulding

We offer services related to the injection molding of plastic parts with up to 80 cc.



  • High quality injection molded plastic products;
  • We work with the most common thermplastic materials – PE, PP, PA, PC, PS, ABS, PVC, PET, POM, TPU and etc.




CNC machining of metals and plastics

We offer different kind of CNC machining of metals and plastics

  • CNC Lathe turning;
  • Milling metal and plastic working with complex and simple geometry;
  • Wire EDM machining;
  • Heat treatment of metals;
  • Semi-liquid stamping of aluminum;