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COATINGS questionnaire rep.RI
 
 
Name of company: Person to contact: Role:
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INFORMATION AND REQUESTS
 
FULL QUESTIONS TO INDIVIDUATE A PLASTIC COATING
1 - What material is the part made of?
(stainless steel, aluminium, carbon steel, special alloys, etc)
2 - Has the part got any thermal and/or superficial processing?
(if so say what)(cementation, tempering, carbon nitridation, nickelization, chromium plating, etc)
3 - Which kind of strains or mechanical actions will the coatings undergo?
(superficial or punctual rubbing, no strains, just aesthetic function, etc)
4 - The coating undergoes corrosion, detergents, solvents: or what else?
(if so say what)
5 - Has the coating to resist to heat?
(if so say min. or max. temperatures and time intervals)
6 - Has the coating to show food contact capability
7 - Has the coating to show electric conductivity or insulating characteristics?
8 - Which colour is required?
yellow        black        grey        white
9 - Which kind of solutions have been adopted so far to solve the highlighted problem?
 
10 - IDENTIFICATION OF REFERENCE DETAIL
Code: Denomination:
 
INFORMATION

Since a process for coatings preparation in plasticization is sandblasting, the following premises are necessary:

  • Bevels will be possibly rounded off;
  • Heavy seams may not be removed;
  • Some deformations, not always checkable, may come out.

N.B. It is important to notice that sharp edges can be removed or reduced to a large extent such as seams, the main cause of triggers to coating cutting;

As the part, before the plasticization, is put into oven to preheat, the following premises are necessary:

  • If parts have got superficial treatments, at preheat temperatures (260450) they may temper. Anyway the superficial temperature of pieces will not be superior to 280C;
  • If material is copper, aluminium or their alloys or some other, the part can undergo some deformation;
  • Deformation is anyway linked to thickness and part shape, therefore the least thickness required is 2-2,5 mm;
  • At the end of immersion internal areas may show powder residues and deposits or uncoated parts;
  • High thermal conductivity materials such as copper, aluminium, etc. need lower temperatures in respect to common steels;

Since plasticization occurs in immersion, the following premises are necessary:

  • Coatings thickness (regularity) is unstable;
  • It is necessary to agree about parts setting points;
  • The cooling system currently employed in Zocca Srl consists in air and without any movements of the parts. This can affect the coating steadiness;
  • When plastic layer melts, the film is easily tautened on the sharp corners, and these may be completely uncovered. The best thing would be having corners with radius of curvature equal or superior to 3 mm;
  • Coating on non-ferrous Metals such as for example copper, bronze, brass, nickel silver for its little adherence is normally suggested as electric non-conductor or for abrasion resistance;
  • All parts to be coated must be removable and thus handy;
  • Solderings present on substrate must be very smooth and not porous because during the piece cooling these ones may cause a series of blisters within coatings. Soldering grains and sprays are to be removed because they risk not being coated.
 

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