How to handle Samdo Sintered Rings

A) Preparation

        1.  In general, if the manufacturing data shown on the package is older than three months or if the rings have been stored throughout a hot and dry season, be sure to repeat oil impregnation.
        2.  Fill oil reservoirs 70-80% at least 24 hours before frames are to be operated.

B) Oiling

        1.  During the earlier stages, much more oil is consumed.  Fill oil reservoirs again when no oil is found on them (even if the felt or sponge still contains oil).

        2. In order to maintain efficient performance of the sintered rings, proper control of the lubricating oil plays an important role.  Grades of oil listed in the following chart are applicable for lubricating the sintered rings.  Selection of lubricating oil differs according to the operating conditions.

Table: Lubricating Oil

Legend: RED = Worsted Spinning BLUE = Tire Cord Twisting GREEN = Double & Draw Twisting BLACK = Glass Fiber Twisting PURPLE = OTHERS

        3. Utmost care should be taken in the lubrication cycle as well as with viscosity and other properties of lubricating oils.   It is also important that oil-retaining materials, such as felt and sponge, are controlled so as to remain in a soaked state, regardless of whether it has an individual or central lubricating system.  Oil-filling quantities and lubrication cycles very in accordance with the sizes of oils pots, but shall be within the general ranges listed below.  The list also shows those of steel rings for comparison.

C) Care & Maintenance

    1. In the initial startup, you can use high performance sintered rings more effectively when you carry out a warming up operation for optimum fitting of the sliding surface between the ring and the traveler and then swipe the inside surface with a soft, clean cloth to prevent yarn stains before applying ring oil.

Warming Up operation

For both sintered rings and steel rings, lower the spindle rotation to 10-20% of the normal operation for the first 50 to 100 hours.  For filament yarn, it is better to turn to spindle 3,000 to 4,000 rpm for 15 to 25 hours while fixing the yarn at the upper part of the bobbin and setting the yarn on the traveler without feeding the yawn.   For fine yarn count or yarn of fine denier, also try to start setting with a light traveler as far as possible for sound fitting of the slide surfaces between the ring and the traveler.

    2. In the course of use, air holes of sintered rings become clogged and oil impregnation becomes unstable.  It is necessary, therefore, to perform cleaning and grinding repair at proper intervals.  Though the cycle of ring maintenance differs greatly depending on the working condition, use the following table for reference in deciding the cycle of maintenance.

-In the case of steel rings, it is necessary to perform wick replacement, cleaning, and grinding repair at regular intervals.
-The life of sintered rings differs greatly depending on the working condition, but with three times the grinding repair, which can be prolonged to ten years.
-The life of sintered rings, where steel travelers are used, is likely to be shorter than that of steel rings.  This is usually more than adequately compensated for by improvement in speed, yarn quality and cleanliness

D. Cleaning

Sintered rings have to be cleaned once every 1 to 1 1/2 year by conventional head impregnation or by separate cleaning equipment in order to keep them in good, efficient working condition for a long time.  The cleaning and soaking equipment with the function of air-passing check, as seen in the photos below, was uniquely designed by us for the purpose of treating the sintered ring and is available for our customers.
    Using vacuum and high air pressure, this equipment sucks and blows oil and other fluids through interconnected pores in the sintered rings along with foreign substances such as fire dust, abrasive particles of the ring and traveler, and some carbonized matter originating from lubrication oil.  Time required for cleaning is set with a timer depending on the severity of the stain.  The time required for this cleaning procedure is about 20 to 30 minutes for the sintered rings after one year of operation.