DD218730A3 - METHOD FOR FORMING HUTS FROM POLYVINYL CHLORIDE FLAKE TREATMENTS - Google Patents

Abstract

METHOD FOR FORMING HATS FROM POLYVINYL CHLORIDE FLAKE TILES IN THE DEEP METHOD PROCESS WITH THE AID OF UNIQUE UNIVERSAL HAT FORMULAS, WITH THE AIM OF REDUCE THE THERMAL EXPOSURE OF PVC MESH, INCLUDING THE INCLUDED COLOR PIGMENTS, AND TO MAKE SUBSTANTIALLY THE FORMING TIMES OF THE FORMING TIMES. THE TASK IS PERFORMED BY THE INVENTION THAT THE FLUID TAILORED WIDTH SHOULD BE SUBJECT TO TWO-STAGE, WITH THE IMPACT OF STEAMED WATER VAPOR IN EACH 10 TO 30 SECONDS, UP TO 20% TO 30% THROWING TO A DRUM-HOLLOWED TENSION, AT 25% TO 30%, AND RADIAL AT THE SAME TIME AS EQUIVALENT PULLERS IN HOT FORM ARE TOWED. AFTER FIXING AND SHORT AIR SHOWER (T = 30 DEGREES - 40 DEGREES C) THE HUTROHLING IS DRYED AT 45 DEGREES C. THE MANUFACTURING TIME COULD BE CANCELED TO 1.5 MINUTES.

Description

Title of the invention

Method of shaping hats made of polyvinyl chloride · fabrics

Field of application of the invention

The invention relates to a method for shaping grooves made of polyvinyl chloride, in particular made of knitwear or those with predominantly polyvinyl chloride content.

Characteristic of the known technical solutions

So far nute be made of polyvinyl chloride (PVC) -Hash goods in the way that textile fabrics made of PVC knit fabric pulled on a mold and shrunk in a heating cabinet at 100 ⁰ C to 110 ⁰ C temperature on the male. After the cooling process, the hat blanks are demolded by hand. This manufacturing section; It takes about 1,5 hours, and the thermal load of PVC material extends over 40-50 ЗШшъеп. In the case of certain inhomogeneities of the material in the last third of the heat treatment, thermo-oxidative damage can occur, which also has an effect on a number of dyeing offs used.

- 2 object of the invention

The invention is directed to a process which excludes thermo-cidative damage with conventional low inhomogeneities of the C-7C material and which does not call into question the use of commercially available dyes.

Explanation of the essence of the invention

The invention has for its object to develop a method that enables material-appropriate treatment of P7C or PVC-containing knit fabric, abglichst shortening the treatment times, the shaping of the hat blank.

According to the invention, the object is achieved in that the tensed cut wet textile fabric is shrunk by 20 % to 40 % in two stages by saturated steam. The treatment intervals amount to 10 to 30 seconds each. Subsequently, the shrunken surface is stretched under radial Zräftezug by 20% to 30%. From this under tension flat sheet is formed by deep drawing on hot mold within 20-30 seconds of Hu blank, with the beginning of the deep drawing process to its completion, the tensile stress is reduced in a defined sequence to zero, so that sufficient material in the Fom can be confiscated. With the end of the deep drawing process, the hat blank is cooled by an air shower aaf 30 ⁰ G to 45 ⁰ G in 5 seconds, removed from the mold and dried at the latter temperature.

In the prior art, the method has a number of advantages. They are particularly in

- The resinification of the thermal action on the PVC knitwear and thus the preservation of the strength standards

- the gentle action on used dyes whose properties remain unchanged

- the use of the usual Iviachinen parks to carry out the process steps

- The substantial shortening of a working game for producing a hat blank to about 2%.

embodiment

The invention will be explained in more detail below using an exemplary embodiment.

For carrying out the process on known modified universal forming machines of the hat industry, the PVC or WC-containing knit fabric is cut to the usual extent, fastened in a ring of clamps and wetted with water. Saturated water vapor blows from below against the cutting part, wherein the textile surface shrinks on reaching the temperature of 90 ° - 100 ⁰ C within 15 seconds and stretches like a tympanic membrane.

At 20 % to 30 % shrinkage, the textile surface is relaxed and subjected to another treatment with saturated water vapor until the drum-like Spa.nnungszustand and a shrinkage of about 20 % - 25% is reached again. After switching off the steam supply, the tension in the knitted fabric is increased by increasing the radius of the fabric

The tension clamp wreath increases and follows a sequence, which also compares the stitch pattern. Then, to form the top of the hat, the male located above the prepared textiles Лёссе is lowered against the female die below, with renewed steaming. In the process, the PVC mesh undergoes only a slight tightening by the controlled radial movement of the tensioning clamps in the direction of the center, so that the knitwear can flow into the mold shut off the steam supply, condensed condensed water and fixed in the mold for 10 seconds at a temperature of 50 ° "to 50 C. After an air shower at 45 C, the hat blank can be demolded and dried in air flow at 45 ⁰ C. The duration of treatment with heat is 40 seconds.

Claims (1)

_ с; 3rfi.ndu.rigs ал spoke Anspruch [en] A process for shaping hats made of polyvinyl chloride sheet formed in a deep drawing process with heat input to the hat blank, characterized in that the foliar chloride sheet heats up with saturated vapor after moistening and radial tension, in a first stage by decreasing voltage 'to 30 seconds by 20 ρ in 10 to 40 fo shrunk in a second treatment stage relaxed and under heating with saturated steam at 20% to 30% shrunk up to the tympanic membrane-like state, then stretched by 20% to 30% and Molded between the die and male in a known manner, then fixed for 10 seconds at temperatures of 40 ⁰ C to 30 ⁰ G and 5 seconds in the air stream at a temperature of 30 ⁰ C to 45 ⁰ G is cooled.