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Compact Polycarbonate UV Protected sheet 2050 x 1000 mm Thickness 5 mm

  • Codice Prodotto Lastra Policarbonato Compatto Makrolon Protetto UV 2050x1000x5mm
  • Disponibilità In Magazzino
    • 178,00€
    • 151,30€
    • Extra sconto 15%
    • Risparmio 26,70€
    • Prezzo IVA esclusa 124,02€

Transparent compact polycarbonate sheet with UV protection

Size:


Length 2050 mm 

Width 1000 mm 

5 mm thick



Polycarbonate solid sheet

The polycarbonate sheets, transparent, shiny and UV stabilized. Offer an exceptional impact resistance, superior to that of the products of their class. The plates are mono-resistant to a temperature range from -100 to +120 ° C, are very transparent and have a good fire.

 

Applications:

 

The typical application of this kind of plates include protection for machinery, lighting fixtures, signs, panels, doors and walls. They also offer protection against rotturre unintentional and intentional damage. Can be thermoformed, cold bent and machined with ease.

Processing of semi-finished

 

1. Cold forming

 

Cold bending: these sheets can be cold bent with a minimum radius of curvature corresponding to 150 times their thickness. For smaller radii it is recommended that the method of thermoforming.

 

Cold bending: the plates are suitable to be bent cold. For best results, make sure that the values are not exceeded.

 

Sheet thickness in mm

Radius of curvature in mm

Maximum angle of bending

 

1 and 2.5

2

90

3 and 4

3

90

5 and 6

4

60

 

The relaxation of tension that occurs immediately after the operation requires a sovracurvatura for plates of approx. 25 °. The internal and external tensions reach only a few days after the state of equilibrium, after which the sheets retain their final shape.

Note that, in the cold bending, in marginal areas have a high voltage source.

Avoid the use of aggressive chemical agents, in particular in the case of curved plates or cold bent. It is recommended that the method of cold bending only for the processing of thin slabs.

 

2. Thermoforming

 

Protection Film: the plates are provided with a protective film to prevent damage to the surface during transport and processing.

When machining or plastic leave the protective film on the glass. The solar radiation and weather can affect the characteristics of the protective film, so it might be difficult to remove after such exposure (may remain traces of adhesive).

The film protection standard used is not suitable for thermal imaging. It is not advisable to subject these products to thermal transformation. It is, therefore, necessary to remove the film before drying, smoothing the hot and / or processing termica.Per processing of the sheets with protective film we have certain specific types of film is not printed (Special Production).

 

Pre-drying: although only absorb a small amount of moisture from the air, it is nonetheless recommended to submit drying before molding. Without this precaution, the heating would occur during a formation of bubbles which will adversely affect the aesthetics of Article finito.Per ensure an effective pre-drying at a temperature of 120-125 ° C are recommended furnaces with air circulation, the duration of 'operation varies in relation to the thickness of the slabs.

 

Sheets Thickness (mm)

Drying time in h at 125 ° C

1

1,5

2

4

3

7

4

12

5

18

6

22

8

30

 

After removal of the protective film sheets can be introduced in the oven , it is also possible to hang or place them on a support . Make sure that the distance between the plates is of 20-30 mm, so that air can circulate freely.

To save energy and reduce the duration of heating in thermoforming press , after pre-drying the sheets should remain in the oven until they are processed . The plates cooled to room temperature must be subjected to further processing within a maximum of 10 hours , depending on the environmental conditions , otherwise it is necessary to repeat the operation.

Cutting the slabs of measure is necessary to take into account the fact that when the material is heated the first time above the glass transition temperature (145 ° C) occurs a withdrawal , which is then final .

The extent of withdrawal ranging from a maximum of 6% for sheets up to 3mm thick , to a maximum of 3% for slabs thicker .

Before machining the plates must be thoroughly cleaned with a detergent or with antistatic ionized compressed air , to avoid the formation of defects on the surface, such as occlusions of dust particles in the finished article .

 

 

Bending hot


The hot bending is a manufacturing process relatively simple to produce bent parts on a single axis. It is sufficient to locally heat the plates to a temperature of 150-160 ° C, so in general it can be to give up a pre-drying.

This type of plate is linearly heated with infrared lamps or incandescent wire. As soon as it has reached the desired temperature, the plate is moved away from the heating elements, bent, inserted and fixed in the tool. Keep it fixed in the desired shape until the solidification of the material.


Heating


To produce special formats without defects is necessary to heat the plates in a controlled and uniform at a temperature comprised between 175 and 205 ° C.

The highest precision of shape is obtained by operating in the upper range of temperature . Since the temperature of deformation is very high and the slabs cool quickly , it is preferable to directly heat the plates on the press and not in separate ovens , as often occurs with other thermoplastics .

For the heating of the slabs is recommended the infrared systems , which heat up quickly , possibly applied on both sides of the plates to ensure a heating of the material faster and more uniform . This helps to reduce cycle times and improve operational profitability. The heating duration increases, with almost linear proportionality , with the thickness of the slabs and must be determined empirically on the forming press .

To avoid a considerable loss of heat at the edges during heating, or an uneven cooling , which may cause deformation or retirements , suggest the thermoregulation of fasteners . To smooth out the trend of thick, the sheets can be chamfered, with mechanical -stretched.

 

Cooling the finished article


The plates are cooled rapidly, so the processing must proceed rapidly. At the same time, however, due to high heat resistance, you have cooling cycles shorter. The particular printed can be extracted from the mold as soon as it is able to maintain its shape (around 135 ° C).

 

Hot forming


The hot forming is suitable for the production of particular products of simple shape, in uniaxial bending and provided with large radii of curvature. The sheets, heated to the right temperature in an oven with air circulation, are transferred rapidly into a mold thermostated to 80-100 ° C.Il weight of the plates or a light manual pressure exerted using gloves or a cloth is enough to positivo.Successivamente mold forming on their plates must be air cooled, keeping them away from drafts, which could cause deformation and retirements finished article.

We recommend that you remove the protective film before placing the plate in the oven.


Shaping


Moulds


To produce numerous series and / or obtain optimum surface quality must be used molds thermoregulated ( 120-130 ° C ) in steel or aluminum with satin surfaces . An angle of 4 ° -6 relative to the mold for easy removal. Thermoforming in mold design is necessary to calculate a quota increase from 0.8 at ' 1 % to compensate for the withdrawal . It is necessary to provide vent holes in sufficient numbers and properly positioned , with a diameter not exceeding 0,5 - 0,8 mm, to avoid fingerprints on the particolare.Per improve the degassing is possible to enlarge the hole to the outside using a drill more big . Also available are special materials , which allow to obtain molds for forming porous without having to drill holes vent . The radii of curvature must be dimensioned with a width and possibly at least equivalent to the wall thickness of the plates, in order to ensure a greater rigidity and avoid thinning and wrinkling.

Negative and positive moulds

The choice of a mold positive or negative depends on the individual applications. To obtain better quality surfaces on the outer side of the particular one should use negative molds , which are able to reproduce the details better .

Blowing or drawing without counter

This technique is used for the molding of domes . In the counter- blow without using compressed air, no dolly nell'imbutitura you work in a vacuum. To obtain articles free of defects must heat the plates in a uniform manner . Avoid drafts in the workplace , as this may cause uneven heating .

Other technologies


The other methods of thermoforming below are combinations of the processes described .

High-pressure forming

In a mold for forming closed the atmospheric pressure acting on the softened sheet is increased with compressed air , with the result of obtaining a precise reproduction of details and sharp edges .

Forming " twin sheet "

Two heated sheets are inserted between two negative molds . With the aid of compressed air are produced so hollow bodies , for which the finished parts have high structural rigidity combined with low weight. This method allows you to print and weld together two sheets

Relaxation

This type of material should be worked always as far as possible under optimal conditions, to avoid the onset of high internal stresses which would require a subsequent thermal treatment for the gold abatement .

Stretch , or condition , it means warm items , keep them for a certain time at a certain temperature and then cool slowly. If you do this in an oven can break down most of the internal voltage . The slabs are heated uniformly to a temperature of 120-130 ° C , for the total duration of one hour for each 3 mm thick . It is important to subsequently cool the slabs .

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