CS244400B1 - All-plastic screen and mould for its production - Google Patents

Description

The invention solves a plastic bag and a mold for its production.

The hitherto known design of screens used mainly in the medical or automotive industry is a combination of a metal filter fabric or polyamide silk injection molded into a plastic skeleton.

In the ^tk fuckin crosslink ^on the slitting ^{and P s P} with odéln ^yp ol ^SOLUTION BNE latitude and longitude and the edges must be stopped against unraveling. The strips prepared in this way are injected into a cage by means of a complicated device installed on the injection molding machine, which indicates the final shape of the sieve. A large percentage of scrap and unprocessable waste is produced during production. The shape of the strainer undergoes considerable deformation in the final design, which reduces its efficiency and appearance effect. This embodiment is also relatively labor intensive and expensive.

In the medical production of the strainer must polyamide fabric before mounting · be boiled in an autoclave at a minimal of 120 ⁰ C of ^Du in the monomer removal at ^{d p} ol ^y amide caprolactone, which is toxic. The screen also deforms during formation.

^TX Uve e ^d ene ^d osta no ^area on the forehead toanuje ^ ^p las ^t ic strainer according to the invention which is molded from a single material type without modification.

P ^o d ^s This invention is ce ^l OPL ^{asticke IT K} ° m ^{ající f} un ^KCN also parts with mesh and an external or internal reinforcement molded from a single piece of ^{m u} te ^r ial. F ^un CTION time ^T-button assemblies arranged so as ^SES-plated vnitřrách longitudinally ^{Y is} CH ^and outdoor advert ^{IC hp} of manufacture ^No. n ^ACTIVE ribs t ^Vor I ^C thereof. lu ^savings with MV ^{or MV EJ} Aimi I TER ⁿ MENTAL reinforcements one celeb :. Inner ^BC Ichnia

The 244 400 ribs may be circular or helical, and the like.

The process for producing this strainer is carried out in such a way that the melt in the injection molding process proceeds from the inlets of the external reinforcements or internal reinforcements into the outer transverse ribs, from which it is finally distributed into the internal longitudinal ribs.

The sieve manufacturing apparatus of the present invention is a spray film having a mandrel on the surface of which there are grooves for the internal longitudinal ribs of the screen and a split matrix on whose inner surface there are grooves for the transverse ribs of the screen. The grooves for the outer stiffeners are on the inner surface of the die and the grooves for the inner stiffeners are on the surface of the mandrel.

The strainer made according to the invention is considerably cheaper to manufacture, exhibits the shape and appearance stability of the entire strainer and the individual meshes. In medical production, autoclaving is no longer required. According to the invention, it is also advantageous to produce very fine filter screens with a mesh size of less than 0.1 mm.

In the accompanying drawings, Fig. 1 ® 4 shows examples of specific embodiments of the invention of various screen shapes. Giant. 5 shows a cross-section of a screen with outer reinforcements and FIG. 6 a cross-section of a screen with internal reinforcements. FIG. 7 shows the melt flow during injection molding. The spray mold mandrel is shown in Fig. 8 and Fig. 9 is a cross section thereof. The matrix is shown in FIGS. 10 and 11.

The functional part of the sieve 1 is formed from inner longitudinal ribs 2 and outer transverse ribs 2 ejected from one piece of material. At the same time, the inner stiffeners or outer stiffeners 6 are also sprayed.

In the injection molding operation, the melt proceeds from the inlets of the external stiffeners D or internal stiffeners J1 into the outer transverse ribs 2 ^from which the inner longitudinal ribs 2 are distributed.

244 400

Tm 6 in Fig. 8 has grooves for its internal longitudinal ribs and grooves for internal stiffeners on its surface. The matrix X consists of two halves and on its inner surface there are grooves for external transverse ribs and grooves for external reinforcements.

The mesh of the invention can be manufactured in a variety of shapes and for a variety of applications, from healthcare to the automotive industry.

SUBJECT OF THE INVENTION

Claims (2)

An all-plastic sieve consisting of a functional part with meshes and external or internal reinforcements, characterized in that the functional part is formed of internal longitudinal ribs (2) and external transverse ribs (3) forming together with external reinforcements (4) or internal reinforcements (5) one unit. 2. The mold for the manufacture of a plastic sieve according to claim 1, characterized in that it is provided with a mandrel (6) with grooves for the internal longitudinal ribs and internal stiffeners of the sieve and a split matrix (7) on the inner surface of which for external transverse ribs and external screen stiffeners.