Disc type melt filter capable of preventing resin melt from generating gel

Abstract

The utility model relates to a disc type melt filter for preventing a resin melt from generating gel, comprising: a core column, in which a discharge channel is arranged, the discharge channel having a first open end and a second open end; the disc group comprises a plurality of discs which are stacked and sleeved on the core column along the axial direction; each disc is internally provided with a filter channel for resin melt to flow, a filter felt is arranged in each filter channel, the filter felt is used for filtering impurities in the resin melt, and the filter channels are communicated with the discharge channel; the first end cover is mounted at one end of the core column so as to seal the first open end; and the O-shaped sealing ring is arranged in a gap between the core column and the first end cover. According to the application, the resin melt can be effectively prevented from entering the gap between the first open end of the core column and the first end cover, so that the situation that the resin melt is degraded to form gel due to long-time retention in the gap between the first open end of the core column and the first end cover is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of organic plastic film production equipment, and in particular to a disc-type melt filter for preventing resin melt from generating gel. Background Art

[0002] Melt filters are used in the processing of organic thermoplastic resins to filter various mechanical impurities contained in the resin and generated during the processing to improve the quality of resin products. Disc filters are commonly used resin melt filters. Disc filters have the advantages of high filtration accuracy, short melt residence time and long service life. However, common disc filters have dead corners that are prone to produce gels that affect product quality. This kind of gel will form quality defects in the product. This defect will cause the product quality to degrade in minor cases, and in serious cases, the product will be scrapped. Utility Model Content

[0003] (1) Technical issues to be solved

[0004] The present application provides a disc-type melt filter for preventing resin melt from generating gel, thereby solving the problem that the current disc-type filter has dead corners that easily generate gel and affect product quality.

[0005] (2) Technical solution

[0006] The present application provides a disc-type melt filter for preventing a resin melt from generating gel, comprising:

[0007] A core column, wherein a discharge passage is provided in the core column, and the discharge passage has a first opening end and a second opening end;

[0008] A disc assembly, comprising a plurality of discs, which are stacked axially and sleeved on the core column; each of the discs is provided with a filter channel for the resin melt to flow, and a filter felt is provided in the filter channel, and the filter felt is used to filter impurities in the resin melt, and the filter channel is connected to the discharge channel;

[0009] A first end cap, the first end cap being mounted on one end of the stem to close the first open end;

[0010] An O-shaped sealing ring is installed in the gap between the core column and the first end cover.

[0011] Furthermore, the first end cover includes a pressing plate and a clamping nut, the pressing plate is provided with a through hole, the core column is sleeved in the through hole, and the clamping nut is connected to the pressing plate to close the through hole.

[0012] Furthermore, the first end cover is provided with an L-shaped sealing groove along the circumference of the core column, and the L-shaped sealing groove is used for installing the O-ring.

[0013] Furthermore, the material of the O-ring is stainless steel, copper, aluminum, or a high temperature resistant organic material.

[0014] Furthermore, it also includes a sealing ring, which is installed between the first opening end and the locking nut.

[0015] Furthermore, the sealing ring is made of copper, aluminum, or a high temperature resistant organic material.

[0016] Furthermore, a gap filling gasket is included, and the gap filling gasket is installed between the first opening end and the sealing ring.

[0017] Furthermore, the material of the gap filling gasket is stainless steel.

[0018] Furthermore, it also includes a second end cover, which is installed on the side of the disc group away from the first end cover, and the second end cover is provided with a melt outflow channel connected to the second opening end.

[0019] (3) Beneficial effects

[0020] The above technical solution of the present application has the following advantages:

[0021] The disc-type melt filter provided in the present application for preventing the resin melt from generating gel can effectively prevent the resin melt from entering the gap between the first open end of the core column and the first end cover by installing an O-ring in the gap between the core column and the first end cover, thereby preventing the resin melt from being retained in the gap between the first open end of the core column and the first end cover for a long time and causing melt degradation to form a gel. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 A schematic diagram of a disc-type melt filter for preventing a resin melt from generating gel provided in the present application;

[0024] Figure 2 A schematic diagram of a disc-type melt filter for preventing a resin melt from generating gel provided in the present application;

[0025] Figure 3 A schematic diagram of a disc-type melt filter for preventing a resin melt from generating gel provided in the present application;

[0026] Figure 4 Schematic diagram of the L-shaped sealing groove provided in this application.

[0027] Figure numerals: 1, core column; 11, first opening end; 12, second opening end; 2, disc group; 3, first end cover; 31, pressure plate; 32, clamping nut; 33, L-shaped sealing groove; 4, O-ring; 5, sealing ring; 6, gap filling gasket; 7, second end cover; 71, melt outflow channel. DETAILED DESCRIPTION

[0028] The specific implementation methods of the present application are further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application but are not intended to limit the scope of the present application.

[0029] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0030] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0031] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. appearing in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways.

[0032] There are various impurities in the resin raw materials used in biaxial and uniaxial stretch films. The sources of impurities are: during the synthesis process of the resin, the liquid level of the polymerization kettle fluctuates and the material hangs on the kettle wall to produce coking and carbonized material impurities; the catalysts and various additives used in the resin synthesis agglomerate to form agglomerated particles; some films use opening agents and lubricants, which can also form agglomerated particles due to poor dispersion; mechanical impurities such as sand and soil are mixed into the resin particles during the pelletizing, packaging, transportation and feeding links; the resin can also be mixed with metal particles due to wear with the metal pipe wall during pipeline transportation; there will be a small amount of over-crystallized resin particles during crystallization and drying, which will produce infusible materials when extruded and melted in the later stage.

[0033] With the development of film production technology, the speed of film making is getting faster and faster (up to 550m / min); the width of the film mother roll is getting wider and wider (up to 10m); the thickness of the film is getting thinner and thinner (the thinnest can reach 1μm). The film making process has higher and higher requirements for the cleanliness of the resin melt, and the cleanliness of the melt has become a decisive factor in the stable operation of film making. The presence of impurities seriously restricts the production capacity of film making. In mild cases, the speed of the production line is reduced, and in severe cases, the film is broken and production is interrupted.

[0034] With the development of technology, organic thin films are increasingly used in emerging industries, such as various optical films in LCD displays, ITO films, organic thin film capacitors, photoresist dry films for printed circuit boards, release base films for ceramic capacitors, etc. These films have higher requirements for their quality. The presence of various impurities can cause light spots when light passes through them, and can cause short circuits or open circuits in electronic components.

[0035] In summary, both the production of organic films and film products place higher requirements on the filtration of resin melts.

[0036] In order to remove impurities in the melt of organic film production, disc filters are widely used. The disc filters currently used have the following defects: the melt will enter the gap between the core column and the end cover, and the melt will be retained in the gap for a long time to degrade and form gel, which will form quality defects in the product. Such defects may cause product quality degradation in minor cases, and may cause the product to be scrapped in serious cases.

[0037] Organic gel is a kind of bulk polymer with a network structure, which is an infusible and insoluble substance. The gel formed in the early stage has a low degree of crosslinking, similar to jelly. It can be deformed in the resin melt and pass through the mesh of a general filter. After passing through the filter, it returns to its original shape. This early gel can be cut by a metal powder sintering filter to reduce its size, but it cannot be removed.

[0038] In view of the above problems, the present application provides a disc-type melt filter for preventing the resin melt from generating gel, which is used to prevent the melt from entering the gap between the core column and the end cover to avoid generating gel.

[0039] The specific implementation methods of the present application are further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application but are not intended to limit the scope of the present application.

[0040] The present application embodiment provides a disc-type melt filter for preventing the resin melt from generating gel, such as Figure 1 and Figure 2 As shown, it includes: a core column 1, wherein a discharge channel is provided in the core column 1, and the discharge channel has a first open end 11 and a second open end 12; a disc group 2, comprising a plurality of discs, and the plurality of discs are axially stacked and sleeved on the core column 1; each of the discs is provided with a filter channel for the flow of resin melt, and a filter felt is provided in the filter channel, and the filter felt is used to filter impurities in the resin melt, and the filter channel is connected to the discharge channel; a first end cover 3, wherein the first end cover 3 is installed at one end of the core column 1 to close the first open end 11; and an O-ring 4, wherein the O-ring 4 is installed in the gap between the core column 1 and the first end cover 3.

[0041] In some embodiments, the first end cover 3 includes a pressure plate 31 and a clamping nut 32, the pressure plate 31 is provided with a through hole, the core column 1 is sleeved in the through hole, and the clamping nut 32 is connected to the pressure plate 31 to close the through hole.

[0042] In some embodiments, the first end cover 3 is provided with an L-shaped sealing groove 33 along the circumference of the core column 1 , and the L-shaped sealing groove 33 is used for installing the O-ring 4 .

[0043] In some embodiments, the O-ring 4 is made of stainless steel, copper, aluminum, or a high temperature resistant organic material.

[0044] In some embodiments, a sealing ring 5 is further included, and the sealing ring 5 is installed between the first opening end 11 and the pressing nut 32 .

[0045] In some embodiments, the sealing ring 5 is made of copper, aluminum, or a high temperature resistant organic material.

[0046] In some embodiments, a gap filling gasket 6 is further included, and the gap filling gasket 6 is installed between the first opening end 11 and the sealing ring 5 .

[0047] In some embodiments, the material of the gap filling gasket 6 is stainless steel.

[0048] In some embodiments, a second end cover 7 is further included. The second end cover 7 is installed on a side of the disc stack 2 away from the first end cover 3 . The second end cover 7 is provided with a melt outflow channel 71 connected to the second open end 12 .

[0049] In application, the O-ring is used to seal the gap between the melt filter core column and the pressure plate, the sealing ring is used to prevent the melt from entering the gap between the first open end of the core column and the first end cover from between the clamping nut and the pressure plate, and the gap filling gasket is used to fill the gap between the first open end of the core column and the clamping nut.

[0050] After the resin melt enters the melt filter, it can only enter the core column and flow out from the second end cover after being filtered by the filter felt of the disc. The O-ring and the sealing ring can effectively prevent the resin melt from entering the gap between the first opening end of the core column and the first end cover, thereby preventing the resin melt from being retained in the gap between the first opening end of the core column and the first end cover for a long time and causing melt degradation to form gel.

[0051] like Figure 2 As shown, the L-shaped sealing groove is set on the pressure plate. The sealing groove is open, and the size of the sealing groove is determined by the size of the melt filter core column and the pressure plate. The diameter of the sealing ring is 0.8∽1.0mm, and its material includes copper, aluminum, high temperature resistant organic materials, etc. The gap filling gasket is made of stainless steel, and the thickness specifications include 0.5, 0.2, 0.1mm and other series.

[0052] like Figure 3 As shown, the Z value is the gap value between the first open end of the filter core column and the tightening nut. The Z value is obtained by measuring with a depth gauge after the filter disc is assembled and compacted. The Z value has the following relationship with the gap filling gasket thickness and the sealing ring wire diameter: gap filling gasket thickness + sealing ring wire diameter Φ = Z + 0.1∽0.2mm, wherein 0.1∽0.2mm is the compressive deformation of the sealing ring wire diameter, from which the filling amount of the gap filling gasket can be calculated.

[0053] like Figure 4 As shown, assuming that the diameter of the first open end of the stem is 85mm, the inner diameter of the pressure plate is 85.1mm, the gap between the stem and the pressure plate is 0.1mm / 2=0.05mm, and an ordinary balanced metal hollow O-ring is selected. The O-ring specifications are: inner diameter 85.1mm, wire diameter*wall thickness 2.4*0.25mm, outer diameter 85.1+2.4*2=89.9mm.

[0054] An L-shaped sealing groove is processed on the pressure plate. It is an L-shaped open type with an outer diameter of 90mm and a groove depth of H=ηd, where η is the flattening rate of the metal hollow O-ring wire diameter, η=0.6-0.7, and d is the O-ring wire diameter, H=0.65*2.4=1.56mm.

[0055] The present application provides a disc-type melt filter that prevents the resin melt from generating gel. After the resin melt enters the melt filter, it can only enter the core column and flow out from the second end cover after being filtered by the filter felt of the disc. The provision of an O-ring and a sealing ring can effectively prevent the resin melt from entering the gap between the first open end of the core column and the first end cover, thereby preventing the resin melt from being retained in the gap between the first open end of the core column and the first end cover for a long time and causing melt degradation to form gel. The reduction of gel in the film-making melt improves the stability of film production and the quality of film products.

[0056] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In actual applications, the above-mentioned functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application.

[0057] It should be clear that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. For the embodiments of the method, the relevant parts can refer to the partial description of the device embodiment (adopted according to the writing situation). The present application is not limited to the specific steps and structures described above and shown in the figures. In addition, for the sake of simplicity, a detailed description of known method technologies is omitted here.

[0058] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A disc-type melt filter for preventing a resin melt from generating gel, characterized in that: include: A core column, wherein a discharge passage is provided in the core column, and the discharge passage has a first opening end and a second opening end; A disc assembly, comprising a plurality of discs, which are stacked axially and sleeved on the core column; each of the discs is provided with a filter channel for the resin melt to flow, and a filter felt is provided in the filter channel, and the filter felt is used to filter impurities in the resin melt, and the filter channel is connected to the discharge channel; A first end cap, the first end cap being mounted on one end of the stem to close the first open end; An O-shaped sealing ring is installed in the gap between the core column and the first end cover.

2. The disc-type melt filter for preventing the resin melt from generating gel according to claim 1, characterized in that: The first end cover comprises a pressing plate and a clamping nut. The pressing plate is provided with a through hole. The core column is sleeved in the through hole. The clamping nut is connected to the pressing plate to close the through hole.

3. The disc-type melt filter for preventing the resin melt from generating gel according to claim 1, characterized in that: The first end cover is provided with an L-shaped sealing groove along the circumference of the core column, and the L-shaped sealing groove is used for installing the O-ring.

4. The disc-type melt filter for preventing the resin melt from generating gel according to claim 1, characterized in that: The material of the O-ring is stainless steel, copper, aluminum, or high temperature resistant organic material.

5. The disc-type melt filter for preventing the resin melt from generating gel according to claim 2, characterized in that: Also included is a sealing ring installed between the first open end and the compression nut.

6. The disc-type melt filter for preventing the resin melt from generating gel according to claim 5, characterized in that: The sealing ring is made of copper, aluminum, or a high temperature resistant organic material.

7. The disc-type melt filter for preventing the resin melt from generating gel according to claim 5, characterized in that: Also included is a gap filling gasket installed between the first open end and the sealing ring.

8. The disc-type melt filter for preventing the resin melt from generating gel according to claim 7, characterized in that: The material of the gap filling gasket is stainless steel.

9. The disc-type melt filter for preventing resin melt from generating gel according to claim 1, characterized in that: It also includes a second end cover, which is installed on a side of the disc group away from the first end cover, and the second end cover is provided with a melt outflow channel connected to the second opening end.

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