SU1254055A1 - Method of applying enamel slip onto pipe - Google Patents

Description

The invention relates to the application of plastic liquids to a private enamel ticking agent on both surfaces of the pipe by immersion, and can be used in various hospitality areas where a double enamel pipe is required.

The aim of the invention is to improve the quality of the applied slurry layer by increasing the uniformity.

The drawing shows the scheme of implementation of the method.

The proposed method is carried out by means of a device consisting of a tank 1. filled with a flasher 2 and connected via pipelines 3c by reactor 4 and pumps 5 and 6, and pump 6 has a lower capacity than that of a circular clock 5. Pump 6 is connected via pipelines 7 with a capacity of 1 and reactor D, In tank 1, a displacer 8 is placed, and in the upper part of tank 1 is a receiving collector 9. On the walls of tank 1 and displacer 8 of the slip at a distance f from the surface are collectors tO for supplying the slip to jets the inner and outer surfaces of the pipe 11.

Pipe 0 300 mm with a wall thickness of 4 mm is immersed in a container filled with a slip. In this case, the slip in the tank is continuously driven by the pump 5 through the collectors 10, located near the surface at a distance f from the slip surface, the slip, filling the tank, is poured over the top edge into the receiving collector 9, from which by gravity the tubes enter the reactor 4 where it is mixed and again pump 5 is fed to the application tank 1. Thus, the tank 1 for applying the slip is an integral part of the circulation loop, in which the pysher is in continuous motion. The level of the slip in the container 1 for application is kept constant, since this level is formed as a result of the overflow of the slip through the upper edge of the container 1.

At a distance f from the level of the surface of the slip, determined by the ratio

f t, ....- V

one

25А055 where

 - distance from the surface level to the zone of destruction of the structural mode of the slip flow; 5 ISS time during which

the structural mode of the slip flow, which is determined by the thixotropic properties of the slip, is restored,

 О V is the speed of the Slip Motion in the tank, determined from the design characteristics of the circulation circuit. The streams from the collector 10 feed the slotted-hole, continuously destroying the structural mode of the flow of the slip into the vessel both in the volume outside the pipe and inside it. The distance f is determined depending on the thixotropic slip properties of the slip according to the formula given above. The characteristics of the thixotropic properties of the slip are the time T, KS, the speed V of the movement of the slip in the tank.

25, in the process of removing the pipe from a container filled with a desiccant both on the inner and outer surfaces of the pipe, there remains a slurry layer resulting from 30 entrainment when the slurry pipe moves, its surface is well wetted. At the same time, the quality of the slurry layer applied to the pipe, in particular, the thickness and uniformity of thickness, 35 as studies have shown, depend on the state of the slurry near its surface level in the application container. The resulting structural thixotropic properties of the slip current 40 in the application tank are destroyed, additionally continuously feeding the slip into the container with jets, but not onto the surface of the slip level in the container, but feeding additionally with slip and into the volume at a certain distance f from the surface of the slip in the tank.

Primer p. Pipe 0 300 mm with a wall thickness of 4 mm, a length of 10 m was immersed in a container filled with a slip, and removed from the container. The slip was characterized by the following operating parameters; grinding fineness 2 ml / min (according to the Lysenko method), specific gravity 1.7 g / cm, consistency 12 g / dm, The speed of extraction of the pipe from the tank is 10 m / min.

The distance of the collectors from the surface of the slurry was consistently equal to f-25 mm with the speed of the slurry in the tank equal to V 15 mm / s and the recovery time of the structural mode for a given composition equal to i, 3 s.

According to the proposed method, the structural mode of the slip flow in the surface layer is destroyed not by the movement of the pipe walls, but by jets of the editor. L. Povkhan

Compiled by V.Oleynichenko

Tehred M. Khodanich Proofreader M. Maksimishinets

Order 4690/31 Circulation 878 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

25А0554

keru, i.e. create stable conditions for applying the slip both on the initial section of the pipe and on its entire surface. This determines the higher quality of the applied slurry layer for subsequent coating.

The proposed method allows O to obtain a uniform slip layer over the entire surface of the pipe.

Claims (1)

METHOD FOR APPLICATION OF AN ENAMEL SLIPPER ON A PIPE by immersion in a slip and removing from it during continuous movement of the slip and maintaining the level of the slip in the container at a constant, characterized in that, in order to improve the quality of the applied slip layer by increasing uniformity, an additional slip is fed jets in the tank, bone at a distance from the top; the surface level of the slip determined by the formula where E 7 is the distance from the surface level to the fracture zone of the structural flow regime _{from the} slip; S 1 _TIKS - the time during which the structural regime of the slip flow is restored; V is the slip velocity in the tank. SSO W31 ^{, and} AS J