ISO 1268-5:2001 pdf download

ISO 1268-5:2001 pdf download.Fibre-reinforced plastics -Methods of producing test plates — Part 5: Filament winding.
8.3 Impregnating devices
8.3.1 General
One of the impregnation devices described in 8.3.2 and 8.3.3 may be used. If a different system is used, details shall be given in the test plate preparation report (clause 11).
8.3.2 Impregnating bath (see Figure 1)
The temperature of the resin system in the bath shall be monitored to maintain its viscosity (see 5.2) as nearly constant as possible in order to ensure uniform and complete impregnation of the roving.
It is therefore recommended that the impregnating bath should have a double wall permitting the circulation of a
temperature-regulating liquid, and that the dimensions of the bath allow an impregnation length of at least 400 mm
and provide a resin capacity of about 11.
The type of bath shown in Figure 1 is given as an example. It is recommended that the bath have the following characteristics:
— an eye-type thread guide at the entrance to prevent abrasion (made of e.g. polytetrafluoroethylene or chromium- plated metal);
— a thread guide at the exit, ensuring complete impregnation without drying;
— devices for retaining resin foam;
— guide rods under the resin surface (alternating sets of flat and grooved).
8.3.3 Impregnating roller (see Figure 2)
The roller shall be corrosion- and wear-resistant. It shall be free-wheeling and have a minimum diameter of 120 mm. The length of the area of contact between the roving and the roller shall be not less than 20 % of the roller circumference, and the roller shall be immersed in the resin to a depth of approximately 20 % to 30 % of its diameter. A doctor blade shall be used to control the amount of resin on the roller. The distance between this blade and the roller shall be variable between 0 mm and 3 mm. The setting of this blade shall be determined by preliminary tests. A scraper blade shall be used to remove the resin the roving does not pick up.
8.5 Press with heated platens
The press shall have the following characteristics:
— minimum force: 20 kN;
— temperature adjustable according to the curing cycle required by the resin and its catalyst system.
If a press with heated platens is not available, the following may be used:
— a system for clamping the outer-mould pieces in place;
— an oven capable of maintaining the curing-cycle temperature required by the resin system.
9 Procedure
Unless otherwise specified, the rovings shall be processed without previous conditioning.
Mount the former on the spindle of the winding machine. When the impregnating bath has to be kept at a temperature higher than 50 °C, it is recommended that the former be maintained at as nearly constant a temperature as possible (by means of a radiant panel for example).
Adjust the speed of rotation of the spindle to obtain a roving speed of between 5 rn/mm and 15 rn/mm; the speed shall be selected such that the winding operation can be completed during the pot life of the resin (see 5.2).
Choose the winding parameters as follows:
— Winding pitch, p: 0,5 mm