The marked and the welding laser of plastics
The welding by laser offers the possibility to solder almost any form without vibrations and without generation of strong heat, that is important for the sensitive components. Different types of polymers can solder of durable form, and the fact that the sewing of welding remain unseen offers additional aesthetic advantages in the design.
The processes of marked laser
Marked with the laser vector
With a vectorial laser, the mirrors of galvanometer of high precision move . These guarantee no only a high dynamic, but also an exact positioning of the scrape laser in the piece. With this, the finest textures can mark with an exceptional precision in the outline, even to high speeds of processing.
With this method also exists the option of 'marked on the fly'. Here the movement of the mirror of deviation adjusts with the change of position of the piece that is marking , to be able to inscribe the product without any distortion. The speed of the half of transport is measured continuously by a decodificador of signal to reach a constant registration, also during the set up and the phase of desaceleración.
Marked with the laser of mask
A laser of mask uses a ray laser expanded, that projects through a mask/cavity. With each pulse of the laser creates a mark in the piece. The laser of mask more important for the registration of plastic is the laser CO2. With this method, can attain speeds very elevated of marked, therefore, this type of laser uses with frequency for the identification of batches of mobile pieces. The fault of flexibility of the mask of laser plays a paper subordinated with this application.
The processes of welding by laser
With the welding laser of thermoplastic, creates a connection between two or more pieces of union by means of heat generated with a ray laser. The method more frequently used is the welding laser by transmission.
So that the welding of two materials through the light laser was possible, a component has to be transparent to the scrape laser, and the another has to be absorbent. Both are fixed through a device and are presionados mecánicamente the one to the another. The ray laser penetrates the transparent material and hits the another material absorbent. In this moment, the ray laser transforms in heat and drives to the fusion of both components.
Welding by laser
Outline of welding
In the welding of outline, a ray laser focused displaces secuencialmente along the sewing of welding and melts locally. Because of the geometrical condition, the volume of welding keeps on being small and the release of the mass melted avoids . The relative movement llevar through the movement of the component, of the laser or a combination of the two.
Welding almost-simultaneous
In the process of welding almost simultaneous, the ray laser moves with a very high speed many times along the sewing of welding. Since the time of cooling is longer that the time of cycle, the polymer suelda almost at the same time - of form almost simultaneous. This process is similar to the outline of welding in terms of flexibility, but is faster.
Simultaneous welding
During this process, one or several lasers heat the sewing of welding simultaneously. Thanks to his compact construction, the laser of diode allows in general to attain a high performance. Weldings lineares can realise easily. And besides, new elements developed recently allow the creation of almost any form of ray.
Iriotec Series 8000: optimisation of results in the marked laser of plastics
After having explained all the advantages of these two processes, have to require that the majority of the polymers can not be marked or soldiers with laser GO without the addition of additives. Through the employment of suitable additives, can attain the necessary sensitivity for the power of the laser, independently of the polymer or of the colour wished.
The additives of Merck for laser transform the power of the light laser and, in this way, attain a change of visible colour. This change of colour can obtain of two different ways. Depending on the application, Merck can offer any pigment that attains the change of colour through a reaction with the surrounding polymeric matrix. As alternative, can opt by systems sensitive laser formed by organic and inorganic components that mark from inside (intrinsic) and therefore are independent of the polymer circunstante.
The marked of perfect laser for a particular application depends on a lot of factors such as the polymer, additive, colorante and the type and the parameters of the laser. The identification of the correct configuration to attain the ideal combination can be a difficult task.
To find the correct product for his application, you has to have clear his needs. Which requirements has? What is what wants to attain?
When they use products in dust recommends to incorporate the pigment in a masterbacth or granza before adding it to the final product. This offers the advantage that the system of support can be adapted to the final application, like this the impurities of the material can avoid , if necessary. The use of granules offers the possibility to add the sensitive material to the laser in the final stage of the production. This gives flexibility, but the system of support (PE) does not have to interfere with the final application.
If it uses the marked laser with a wide range of polymers, the best election would be a system of marked intrinsic, to avoid the constant change of the composition of the material. The range of products Merck is adapted for different types of laser of which use today in the market for the processing of plastics.
