CN2535424Y - Multi-orifice spinneret plate with micro-missing annular spinneret orifice - Google Patents

Abstract

The utility model relates to a porous spinning plate (provided with microdefect ring-shape spinning holes) applied to production of hollow fiber filter membrane. Microdefect ring-shape spinning orifices are prepared on the feed-hole bottom of the spinning hole; a supporting arm that holds the central suspending block is arranged at the ring-shape gap, the supporting arm is 0.2-0.08mm wide; the slenderness ratio (the ratio of the orifice length and the diameter) of the spinning orifice is 1:1.6-2.0; the lower part of the feed-hole is a conical hole, and the conical hole is connected to the spinning orifice; a plurality of spinning orifices are prepared on each spinning plate. The utility model is capable to overcome the problem during production of hollow fiber membrane, i.e. eccentricity of the inserted tubular spinneret is easy to occur and gas-liquid quantity control is difficult, as a result, stable production is ensured; in addition, a dozen of or even tens of spinning orifices are prepared on each spinning plate to overcome the problem of existing spinnerets that only single-orifice spinning is available. Therefore, the utility model can largely improve the efficiency of production and reduce the cost.

Description

Little missing link shape spinneret orifice formula porous spinnerets

Technical field

The present invention relates to the special dies that semipermeable membrane is produced, particularly a kind of porous spinnerets of making hollow fiber filter membrane.

Background technology

Membrane separation technique is because of than traditional isolation technics separation accuracy height, and separating rate is fast, the film long service life, and energy consumption is low, has therefore obtained extensive use and develops rapidly.Press the shape branch of film, at present the pattern of film has flat, rolling, tubular type and doughnut etc., and present existing fiber formula diffusion barrier is divided into micro-filtration membrane and milipore filter again, the former separative efficiency height, latter's separation accuracy height.The aperture of supermicro filtration membrane is between milipore filter and micro-filtration membrane (being the 70-80 nanometer), and its separation accuracy is higher than micro-filtration membrane, and separative efficiency is higher than milipore filter (the filter water flux of φ 90 * 1200mm 〉=3T/hr) again.Owing to the development of environment friendly biological and pharmacy (comprising Chinese medicine) technology, relevant industries think that supermicro filtration membrane more meets their needs in recent years.The doughnut supermicro filtration membrane can be widely used in bioseparation technology, the refining and fields such as new resources exploitation, food, environmental protection water treatment and biomedical material of Chinese medicine.But, the general hollow fibre of doughnut film production is made and is required height, because the instructions for use of hollow-fibre membrane has determined fiber that the suitable boss ratio example and the inside and outside hole of uniform wall thickness and rounding will be arranged, with the voltage endurance capability that guarantees fiber and separating property preferably, fibre wall can not have shortcoming, and shortcoming will cause separating effect to descend.

At present, in production hollow fiber ultrafiltration membrane and the micro-filtration membrane, what adopt basically is the insertion tubular type spinning head of the logical liquid of center ventilation or center both at home and abroad.The spinneret orifice of this kind spinning head, its guide hole are long thicker, and the bottom spinning nozzle is consistent with the doughnut diameter, insert breather pipe or fluid-through tube in guide hole, and doughnut forms between spinning nozzle inwall and central gas stream (or liquid stream).This spinning head requires central aeration pipe and spinning nozzle that accurate concentricity is arranged, and the doughnut that has skew to produce slightly promptly is eccentric shape, causes wall thickness irregular; Secondly the air inflow of trace or feed liquor amount require accurate measurement, and control is sensitive.But this variable is difficult to control, often influences Forming Quality because of the gas-liquid amount is unstable, therefore adopts the single hole spinnerette basically, and be difficult to adopt the porous spinnerets, make production efficiency lower, cost is higher, and make, the difficulty of assembling spinnerets mould is also bigger.

Summary of the invention

The purpose of this utility model is to provide a kind of little missing link shape spinneret orifice or porous spinnerets, the spinning nozzle of this spinnerets is an annular that has micro-breach, breach is the brace of a centre of support suspended block, the doughnut of ejection has breach at the firm spinning nozzle that breaks away from, but i.e. sealing voluntarily before curing, make doughnut when setting, its cross section becomes complete annular.The spinneret orifice of this spinnerets need not plug the ventilation fluid-through tube, and manufacturing, assembly difficulty reduce, and guarantee product quality easily; This spinnerets can be provided with tens and even tens spinneret orifices on a spinnerets, can enhance productivity greatly, reduces production costs.

For achieving the above object, the utility model adopts following technical scheme: little missing link shape spinning nozzle is established in the guide hole bottom at spinneret orifice, establish the brace of centre of support suspended block in annular indentation, there, the width of brace is the 0.2-0.08 millimeter, the draw ratio of spinning nozzle also is that its hole length and diameter ratio are 1: 1.6-2.0, in the bottom of guide hole is bellmouth, and bellmouth and spinning nozzle join; Every block of spinnerets is provided with a plurality of spinneret orifices.

This little missing link shape spinneret orifice formula porous spinnerets is loaded on the discharging opening of spinning box, can carry out the production operation of hollow fiber filter membrane, its production operation also can be described as spinning operation (hereinafter to be referred as spinning), its moulding skin texture is: during the certain little missing link shape spinning nozzle of spinning solution length of flow across, be subjected to the shearing of brace and become the annular (also claiming to owe circular) that has otch, owing to having taken place, shearing deformation produces normal stress difference on the one hand, casting solution is after breaking away from spinnerets under the effect of normal force difference, broken away from the constraint of owing circular duct and expanded, the characteristic cross-section shape of spinneret orifice makes spinning solution be subjected to asymmetric guiding force again on the other hand, and make it towards reducing flowing velocity direction (owing joining place between circular port) skew, this spinnerets utilizes the viscoplasticity of spinning solution just, it is expanded through appropriateness again that spinning solution is extruded behind the spinnerets, make fiber bonding before entering coagulating bath curing, remedy the shortcoming of owing circular, but do not stop up centre bore, thereby formed round hollow-fibre membrane.This spinnerets can be provided with several, tens and even tens spinneret orifices on a spinnerets, can enhance productivity greatly, has reduced production cost.This spinnerets does not insert the tubular type spinning head and easily produces eccentric problem, can guarantee that the wall thickness of hollow-fibre membrane is even; There are not control air inflow and feed liquor amount problem when this spinnerets uses simultaneously, can guarantee the quality of product and the stability of production.

Description of drawings

Fig. 1 is the used little missing link shape spinneret orifice formula porous spinnerets structural representation of the present invention

Fig. 2 is the vertical view of porous spinnerets

Fig. 3 is the outside drawing of this spinnerets

The specific embodiment

As shown in Figure 1 and Figure 2, the used porous spinnerets of the present invention, establish little missing link shape spinning nozzle 1 in guide hole 3 bottoms of spinneret orifice, establish the brace 5 of centre of support suspended block 2 in annular indentation, there, the width of brace is the 0.2-0.08 millimeter, the draw ratio of spinning nozzle is 1: 1.6-2.0 is a bellmouth 4 in the bottom of guide hole 3, and bellmouth and spinning nozzle join; Every block of spinnerets is provided with a plurality of spinneret orifices.

Situation when extruding, and the abnormal conditions of being convenient to handle spinnerets for the ease of in spinning process, observing spinning solution, the spinnerets external form can be designed to flange-type, also be that spinnerets is bigger in guide hole one side end face, less in spinning nozzle one side end face, form step-likely, its shape is as shown in Figure 3.

Claims (2)

1, a kind of little missing link shape spinneret orifice formula porous spinnerets that is used for the production hollow fiber filter membrane, it is characterized in that: little missing link shape spinning nozzle is established in the guide hole bottom at spinneret orifice, establish the brace of centre of support suspended block in annular indentation, there, the width of brace is the 0.2-0.08 millimeter, the draw ratio of spinning nozzle also is that its hole length and diameter ratio are 1: 1.6-2.0, in the guide hole bottom is bellmouth, and bellmouth and spinning nozzle join; Every block of spinnerets is provided with a plurality of spinneret orifices.

2, little missing link shape spinneret orifice formula porous spinnerets according to claim 1, it is characterized in that: the spinnerets external form is a flange-type, also is that spinnerets is bigger in guide hole one side end face, and is less in spinning nozzle one side end face, forms step-like.