High temperature cooking oil filtration nonwoven and method of making same

Abstract

The application discloses a high-temperature edible oil filtering non-woven material and a preparation method thereof, and mainly uses PE / PBT bicomponent fibers, nylon particles and needle leaf wood pulp board and aramid pulp as main raw materials, and utilizes hot air bonding and wet papermaking technology to prepare a composite edible oil filtering material with a grammage of 70-150 gsm; the application adds PA6 particles into pulp fibers as an auxiliary thermal adhesive, so that hydrogen bond failure of the filtering material under high-temperature conditions can be avoided, pulp fibers can be prevented from being separated from a fiber web and causing secondary pollution to filtered edible oil, the PA6 particles are used to replace a chemical adhesive, so that the chemical adhesive can be prevented from being easily degraded and causing harmful components to be separated out under high-temperature conditions, and the purity and safety of edible oil are ensured; and the filtering material can withstand high temperature of greater than or equal to 200 DEG C and can maintain stable physical and chemical properties under a high-temperature edible oil filtering environment.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of edible oil filtration, in particular to a high-temperature edible oil filtration nonwoven material and a preparation method thereof. BACKGROUND

[0002] With the continuous development of the food industry and the increasing demand for food safety and quality, the quality control of edible oil is becoming increasingly important. In the production and processing of edible oil, especially in high-temperature processing environment, the filtration link plays a key role in removing impurities and ensuring the purity and quality of edible oil.

[0003] The existing edible oil filtration material mainly uses pulp fiber as the main raw material, and is prepared based on wet laying and chemical bonding technology. The chemical bonding agent in the filtration material is prone to degradation and release of harmful components under high temperature conditions, which pollutes the edible oil and poses a potential threat to human health. The glue-free filtration material maintains the strength of the material through hydrogen bonding, and when encountering reused edible oil with high water content, hydrogen bonding may fail, causing the fibers of the filtration material to fall off and causing secondary pollution to the filtered edible oil. SUMMARY

[0004] The purpose of the present application is to provide a high-temperature edible oil filtration nonwoven material and a preparation method thereof to solve the problems raised in the background.

[0005] To achieve the above purpose, the present application provides the following technical solutions:

[0006] A preparation method of a high-temperature edible oil filtration nonwoven material, comprising the following steps:

[0007] 1) PE / PBT bi-component fibers and hollow PBT fibers are carded into a web by a carding machine, and then subjected to hot air pre-consolidation treatment to obtain a PE / PBT fiber web;

[0008] 2) A pulp board is dispersed by a hydraulic beater to prepare a paper pulp A with a concentration of 5-20 ‰;

[0009] 3) The treated PA6 particles are added to the paper pulp A obtained in step 2, and stirred and dispersed to prepare a composite paper pulp B;

[0010] 4) The composite paper pulp B prepared in step 3 is formed on the PE / PBT fiber web obtained in step 1 by using a hydraulic headbox, and then subjected to dewatering treatment by a continuous vacuum dewatering device;

[0011] 5) The material obtained in step 4 is subjected to secondary dewatering and consolidation by two calendering devices, and then subjected to edge cutting and winding.

[0012] As a further scheme of the present application: the PE / PBT bicomponent fiber web adopts, but is not limited to, 0.7D, 1.5D, 2.5D, 3.5D skin-core bicomponent fibers.

[0013] As a further scheme of the present application: the hot air reinforcement treatment in step 1 has a hot air temperature of 120-160 DEG C and a processing speed of 15-50 m / min.

[0014] As a further scheme of the present application: the pulp board in step 2 includes conifer pulp board and aramid pulp, and the weight ratio of the conifer pulp board and the aramid pulp is 85:15-96:4.

[0015] As a further scheme of the present application: the PA6 particles in step 3 are PA6 particles obtained by pulverizing PA6 chips after liquid nitrogen treatment by using a high-speed pulverizer, and the fineness of the PA6 particles is 300-800 mesh.

[0016] As a further scheme of the present application: the material after the dehydration treatment in step 4 has a water content of 5-15%.

[0017] As a further scheme of the present application: the two calendering devices in step 5 include a first calendering device and a second calendering device, the first calendering device is a three-roller calendering device, the temperature of the compression roller is 120-160 DEG C, the distance between the rollers is 0.8-1.5 mm, and the overall water content of the material after the first calendering device is controlled to be 1-5%; the second calendering device is a double-roller calendering device, the calendering pressure is 50-130 N / mm, and the calendering temperature is 160-190 DEG C.

[0018] The present application also provides a high-temperature edible oil filtering non-woven material prepared by using the above preparation method, and the finished material has a grammage of 70-150 gsm.

[0019] Compared with the prior art, the present application has the following beneficial effects:

[0020] The present application adds PA6 particles into pulp fibers as an auxiliary thermal adhesive, which can avoid the hydrogen bond failure of the filtering material under high-temperature conditions, the separation of the pulp fibers and the fiber web, and the secondary pollution of the filtered edible oil;

[0021] The present application replaces the chemical adhesive with PA6 particles, which avoids the degradation and the separation of harmful components of the chemical adhesive under high-temperature conditions, guarantees the purity and safety of the edible oil, and eliminates the potential threat to human health;

[0022] The filtering material of the present application can withstand high temperature of 200 DEG C or above, can maintain stable physical and chemical properties in the high-temperature edible oil filtering environment, compared with the existing materials, avoids the problems of structure damage and performance decline caused by high temperature, effectively guarantees the smooth progress of the filtering process under high temperature conditions, and meets the needs of high-temperature edible oil processing scene. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 A flow chart of a preparation method of a high-temperature edible oil filtering non-woven material. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0025] The present application provides a high-temperature edible oil filtering non-woven material and a preparation method thereof, a flow chart of the preparation method is shown as Figure 1 The high-temperature edible oil filtering non-woven material and the preparation method thereof will be described below in combination with embodiments.

[0026] A preparation method of a high-temperature edible oil filtering non-woven material, first, PE / PBT bicomponent fibers and hollow PBT fibers are carded into a web by a carding machine, wherein the PE / PBT bicomponent web adopts but is not limited to 0.7D, 1.5D, 2.5D, 3.5D skin-core bicomponent fibers, and in actual production, the fiber composition and proportion can be flexibly adjusted according to different filtering efficiency requirements.

[0027] Then, the carded web is subjected to hot air pre-consolidation treatment at 120-160 DEG C, and the material treatment speed is maintained at 15-50 m / min, which is adjusted according to the material gram weight requirement, and then a relatively fluffy PE / PBT web structure is obtained;

[0028] Meanwhile, paper pulp is prepared, and coniferous wood pulp board and aramid pulp with a weight ratio of 85:15-96:4 are dispersed by a hydraulic beater to prepare paper pulp A with a concentration of 5-20 ‰;

[0029] Then, the treated PA6 particles are added to the paper pulp A in an amount of 3-10 g / t, and are stirred and dispersed to prepare composite paper pulp B, wherein the PA6 particles are PA6 chips treated by liquid nitrogen, and the PA6 particles with a powder fineness of 300-800 mesh are obtained by using a high-speed pulverizer;

[0030] Subsequently, the prepared composite pulp B is used to make PE / PBT fiber web by using a hydraulic flow head, and is subjected to dewatering treatment by a continuous vacuum dewatering device to control the moisture content of the material to 5-15%;

[0031] Finally, the material is subjected to secondary dewatering and reinforcement by two calendering devices, the first calendering device is a three-roll calendering device, the temperature of the press roll is 120-160℃, the distance between the rolls is 0.8mm-1.5mm, and the overall moisture content of the material after the first calendering device is controlled to 1-5%; the second calendering device is a double-roll calendering device, the calendering pressure is 50-130N / mm, and the calendering temperature is 160-190℃; after the above steps, the material is subjected to edge cutting and winding, and the novel non-woven filter material of the present application is obtained.

[0032] The above preparation method uses bicomponent short fibers as the main support layer of the filter material, and the strength and resilience of the support layer can be controlled by adjusting the types of short fibers to meet the diversified filtering requirements; the support layer is pre-reinforced by hot air to lay a foundation for the subsequent composite process; the porosity and pore size of the filter material can be flexibly adjusted by using wet-laid technology, and the entire surface of the filter material has stable and consistent filtering performance; the composite pulp B is evenly laid on the bicomponent fiber web; the composite fiber web is subjected to dewatering and then enters the first calendering device to promote rapid dewatering of the pulp fiber, form hydrogen bonds, and initially form the pulp fiber filter layer; then the second calendering device is entered, and the PA6 particles in the pulp fiber are melted to form secondary reinforcement under high-temperature calendering, which can solve the problem of hydrogen bond failure and pulp fiber filter layer rupture under high-temperature conditions.

[0033] The high-temperature edible oil filtering non-woven material prepared by the above method has a grammage of 70-150gsm.

[0034] The material uses the addition of PA6 particles in the pulp fiber as an auxiliary thermal adhesive, uses a high-temperature calendering device to promote the melting of the PA6 particles inside the pulp fiber, and in the melting process, the PA6 can penetrate into the internal structure of the pulp fiber and fill the gap between the fibers. When the PA6 cools and solidifies, it is equivalent to forming a "physical adhesive" inside the pulp fiber, which binds the pulp fibers more tightly together. This binding method does not rely on hydrogen bonds, but through the physical bonding effect of PA6, it can prevent the hydrogen bonds from failing under high temperature conditions, and the pulp fibers separate from the fiber web, causing secondary pollution to the filtered edible oil. Moreover, by using PA6 particles instead of chemical adhesives, the problems of degradation and precipitation of harmful components under high temperature conditions are avoided. At the same time, the high-temperature edible oil filtering non-woven material obtained by the above preparation method has good temperature resistance and can withstand high temperatures of not less than 200 DEG C. It can maintain stable physical and chemical properties in a high-temperature edible oil filtering environment. Compared with existing materials, it avoids structural damage and performance degradation caused by high temperatures, effectively ensures the smooth progress of the filtering process under high temperature conditions, and meets the needs of high-temperature edible oil processing scenarios.

[0035] Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can modify the technical solutions described in the foregoing embodiments or make equivalent replacements to some of the technical features, as long as they are within the spirit and principles of the present application. Any modification, equivalent replacement, improvement, etc. made shall be included in the protection scope of the present application.

Claims

1. A method for preparing a high-temperature edible oil filtration nonwoven material, characterized in that, Includes the following steps: 1) PE / PBT bicomponent fibers and hollow PBT fibers are carded into a web by a carding machine, and then subjected to hot air pre-consolidation treatment. The hot air temperature of the hot air consolidation treatment is 120-160℃, and the processing speed is 15-50m / min, to obtain PE / PBT fiber web. 2) The pulp board is broken up by a hydraulic beater to prepare pulp A with a concentration of 5-20‰; 3) Add the treated PA6 particles to the pulp A obtained in step 2 at an addition rate of 3-10 g / t, and stir and disperse to prepare composite pulp B; 4) The composite pulp B prepared in step 3 is formed onto the PE / PBT fiber web obtained in step 1 using a hydraulic headbox, and then dewatered using a continuous vacuum dewatering device. 5) The material obtained in step 4 is dehydrated and reinforced twice by two high-temperature calendering devices, and then edge-cutting and winding. The high-temperature calendering device causes the PA6 particles inside the pulp fiber to melt.

2. The method for preparing a high-temperature edible oil filtration nonwoven material according to claim 1, characterized in that, The PE / PBT bicomponent fiber mentioned in step 1 is a core-sheath type bicomponent fiber with a diameter of 0.7D, 1.5D, 2.5D or 3.5D.

3. The method for preparing a high-temperature edible oil filtration nonwoven material according to claim 2, characterized in that, The pulp board mentioned in step 2 includes softwood pulp board and aramid pulp, and the weight ratio of softwood pulp board and aramid pulp is 85:15-96:

4.

4. The method for preparing a high-temperature edible oil filtration nonwoven material according to claim 3, characterized in that, The PA6 particles mentioned in step 3 are PA6 slices that have been treated with liquid nitrogen and then pulverized using a high-speed pulverizer, resulting in PA6 particles with a fineness of 300-800 mesh.

5. The method for preparing a high-temperature edible oil filtration nonwoven material according to claim 4, characterized in that, The moisture content of the material after dehydration in step 4 is controlled at 5-15%.

6. The method for preparing a high-temperature edible oil filtration nonwoven material according to claim 5, characterized in that, The two calendering devices mentioned in step 5 include a first calendering device and a second calendering device. The first calendering device is a three-roll calendering device with a roll temperature of 120-160℃ and a roll spacing of 0.8mm-1.5mm. The overall moisture content of the material after passing through the first calendering device is controlled at 1-5%. The second calendering device is a two-roll calendering device with a calendering pressure of 50-130N / mm and a calendering temperature of 160-190℃.

7. A high-temperature edible oil filtration nonwoven material, characterized in that, It is prepared by the preparation method described in any one of claims 1-6, and the weight range is 70-150 gsm.

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