Preparation process of a fiber reorientation non-woven fabric compensating ultra-high physical property leather substrate

Abstract

The present invention relates to the technical field of artificial leather preparation, and particularly relates to a preparation process for a super-high physical property leather substrate with fiber reorientation non-woven fabric compensation. By laying a fiber reorientation non-woven fiber web layer on a woven fabric to form a composite compensation type laminate of the woven fabric and the fiber reorientation non-woven fiber web layer, and then needling the composite compensation type laminate, a super-high physical property leather substrate is obtained; wherein, the fiber reorientation non-woven fiber web layer has an upper, middle and lower three-layer composite structure, the middle layer is an ordinary fiber web layer without fiber reorientation, and 30-70% of the fibers in the upper layer and the lower layer are reoriented and their fiber directions are changed to be arranged along the longitudinal direction of the woven fabric. The present invention improves the tearing strength of the bovine fiber base fabric, improves the balance of the longitudinal and weft tearing strengths of the bovine fiber base fabric, and reduces the production cost of the bovine fiber base fabric.

Description

Technical Field

[0001] The present invention relates to the technical field of artificial leather preparation, and particularly relates to a preparation process for a fiber reoriented non-woven fabric compensated ultra-high physical property leather substrate. Background Art

[0002] Cowhide fiber base fabric is a base fabric for producing simulated cowhide formed by using cowhide fiber as the main raw material, proportioning a certain proportion of chemical fibers, and performing hydroentangling treatment after fiber web laying and web laying. After the cowhide fiber base fabric is subjected to single-sided impregnation treatment with aqueous PU material and a PU film is attached to the impregnated side of the cowhide fiber base fabric, it becomes simulated cowhide. There are two types of cowhide fiber raw materials used in the cowhide fiber base fabric produced by our company at present. One is to use the scraps of real cowhide and directly obtain cowhide fibers by mechanical cutting and forming method; the other is to use post-consumer recycled leather products and obtain available cowhide fibers after special purification process treatment. The above production process for making cowhide fiber base fabric from recycled leather has the advantages of green, low-carbon and environmental protection, good air permeability and strong real leather feeling, and has been fully recognized in the domestic and international markets, and has now been widely used in many occasions such as clothing, shoes, sofas, etc. At present, the authorized invention patents related to the cowhide fiber base fabric produced by our company include a preparation process for a fully penetrated cowhide fiber leather base fabric (patent number ZL201910270503.3), a post-treatment process for an aqueous cowhide fiber leather base fabric (patent number ZL201910270574.3), a preparation process for a hydroentangled circular cowhide leather (patent number ZL201910270199.2), etc.

[0003] However, there are also some aspects that are worthy of further improvement in the above production process technology of cowhide fiber base fabric:

[0004] First, the transverse tear strength of the produced cowhide fiber base fabric is relatively good, but the longitudinal tear strength is relatively low.

[0005] Second, the softness and hand feeling of the cowhide fiber base fabric still need to be improved.

[0006] Third, the existing production line of cowhide fiber leather base fabric is long and the process is relatively complex, which increases the production cost of the product to a certain extent.

[0007] Therefore, it is necessary to innovate and improve the existing production technology of cowhide fiber leather base fabric to solve the above problems. Summary of the Invention

[0008] To solve the above problems, the present invention provides a preparation process for a fiber-reoriented non-woven fabric compensated ultra-high physical property leather substrate, aiming to improve the tearing strength of the bovine fiber base fabric, enhance the balance of the tearing strength in the longitudinal and weft directions of the bovine fiber base fabric, and reduce the production cost of the bovine fiber base fabric. The specific technical solutions are as follows:

[0009] A preparation process for a fiber-reoriented non-woven fabric compensated ultra-high physical property leather substrate, which forms a composite compensated laminate of a woven fabric and a fiber-reoriented non-woven fiber web layer by laying the fiber-reoriented non-woven fiber web layer on the woven fabric, and then needles the composite compensated laminate to obtain the ultra-high physical property leather substrate; wherein, the fiber-reoriented non-woven fiber web layer has an upper, middle, and lower three-layer composite structure, the middle layer is an ordinary fiber web layer without fiber reorientation, and 30-70% of the fibers in each of the upper and lower layers are reoriented and their fiber directions are changed to be arranged along the longitudinal direction of the woven fabric.

[0010] As one of the preferred embodiments of the woven fabric in the present invention, the woven fabric is a TC woven fabric.

[0011] As another preferred embodiment of the woven fabric in the present invention, the woven fabric is a mixed fiber woven fabric.

[0012] As one of the preferred embodiments of the fiber-reoriented non-woven fiber web layer in the present invention, the fiber-reoriented non-woven fiber web layer is a fiber-reoriented non-woven fiber web layer made of cotton fibers as raw materials.

[0013] As another preferred embodiment of the fiber-reoriented non-woven fiber web layer in the present invention, the fiber-reoriented non-woven fiber web layer is a fiber-reoriented non-woven fiber web layer made of mixed fibers as raw materials.

[0014] In the present invention, the forming steps of the fiber-reoriented non-woven fiber web layer are as follows:

[0015] (1) Carding and web forming: After the raw materials are proportioned, opened, and mixed, the mixed raw materials are carded into a thin fiber web by a carding machine;

[0016] (2) Z-shaped alternating reciprocating web laying: Using a web laying machine, the thin fiber web formed by carding and web forming is laid in a Z-shaped alternating reciprocating manner and laminated to form a thick fiber web;

[0017] (3) Fiber reorientation of the thick fiber web: The thick fiber web formed by Z-shaped alternating reciprocating web laying is conveyed to a fiber reorientation device, and several groups of annular saw blade reorientation rollers rotatably arranged on the fiber reorientation device are used to reorient the upper and lower layer fibers of the thick fiber web, so that 30-70% of the fibers in each of the upper and lower layer fibers are changed to be arranged along the longitudinal direction of the thick fiber web, thereby forming the fiber-reoriented non-woven fiber web layer.

[0018] In the present invention, in the forming step (3) of the fiber redirecting nonwoven fiber web layer, each group of annular saw blade redirecting rollers includes a front annular saw blade redirecting roller, a middle annular saw blade redirecting roller and a rear annular saw blade redirecting roller which are arranged in sequence according to the forward conveying direction of the thick fiber web, and the front annular saw blade redirecting roller and the rear annular saw blade redirecting roller are in contact with the bottom of the thick fiber web, and the middle annular saw blade redirecting roller is in contact with the top of the thick fiber web; wherein, the rotation direction of the front annular saw blade redirecting roller points forward in the tangential direction of the contact portion with the thick fiber web, and the rotation direction of the front annular saw blade redirecting roller and the middle annular saw blade redirecting roller points backward in the tangential direction of the contact portion with the thick fiber web, thereby forming a fiber redirection operation of the thick fiber web.

[0019] Preferably, the annular saw blade redirecting roller comprises a roller body and annular saw blades arranged on the outer circumference of the roller body and arranged at intervals, the outer circumference of the annular saw blade is densely covered with saw teeth, and in the forming step (3) of the fiber redirecting non-woven fiber web layer, the depth of the saw teeth on the annular saw blade penetrating into the thick fiber web is 1 / 6 to 1 / 3 of the thickness of the thick fiber web.

[0020] Preferably, the number of groups of the annular saw blade redirecting rollers is 6 to 15 groups.

[0021] Preferably, the annular saw blades on the annular saw blade redirecting rollers in the same group have correspondingly consistent axial positions on the annular saw blade redirecting rollers.

[0022] Preferably, the annular saw blades on the annular saw blade redirecting rollers that are not in the same group are arranged staggered with each other in the axial direction of the annular saw blade redirecting rollers.

[0023] In the present invention, the web laying machine is respectively provided with a thin fiber web input channel for docking with the carding machine and a thick fiber web output channel for docking with the fiber redirecting device, and the thin fiber web input channel and the thick fiber web output channel are perpendicular to each other, and the reciprocating direction of the Z-shaped alternating reciprocating web laying is arranged transversely relative to the thick fiber web output channel.

[0024] In the present invention, when the composite complementary laminate is needle-punched, three needle-punching operations are performed to form the fiber-redirected non-woven complementary ultra-high physical property leather substrate.

[0025] In the present invention, cowhide fibers are laid on a super-high physical property leather substrate, and the cowhide fiber base fabric is obtained after water entanglement and drying.

[0026] The beneficial effects of the present invention are:

[0027] First, in the preparation process of a fiber reoriented non-woven fabric compensated ultra-high physical property leather substrate of the present invention, by laminating and needling a woven fabric with a specially reoriented non-woven fiber web layer, on the one hand, the relative slippage between the woven fibers in the woven fabric can be eliminated, thereby greatly improving the overall tear strength of the substrate; on the other hand, since the non-woven fiber web layer has been reoriented, it plays a role in strengthening the longitudinal tear strength of the leather substrate; when this substrate is used to make the base fabric of bovine fiber leather, it can effectively overcome the drawback that the longitudinal strength of the conventional bovine fiber leather base fabric is relatively low after production.

[0028] Second, the preparation process of a fiber reoriented non-woven fabric compensated ultra-high physical property leather substrate of the present invention has a short process flow, and has the comprehensive advantages of low cost, low energy consumption and high tear strength, thus being conducive to greatly enhancing the market competitiveness of leather products.

[0029] Third, in the preparation process of a fiber reoriented non-woven fabric compensated ultra-high physical property leather substrate of the present invention, by laying the web in a Z-shaped alternating reciprocating manner, the thickness of the fiber reoriented non-woven fiber web layer can be flexibly adjusted, so as to meet the requirements of different customers for different tear strengths of leather products.

[0030] Fourth, in the preparation process of a fiber reoriented non-woven fabric compensated ultra-high physical property leather substrate of the present invention, when the prepared ultra-high physical property leather substrate is used for the subsequent production of the bovine fiber base fabric, the enhanced tear strength not only makes up for the influence of the subsequent hydroentangling operation on the strength reduction of the TC woven fabric, but also makes up for the drawback that the longitudinal strength is relatively low after the subsequent laying of bovine fibers and hydroentangling.

[0031] Fifth, in the preparation process of a fiber reoriented non-woven fabric compensated ultra-high physical property leather substrate of the present invention, due to the high tear strength of the produced ultra-high physical property leather substrate, in the subsequent process of making the base fabric by laying bovine fibers and hydroentangling on this substrate, the process of single-sided impregnation treatment on the bovine fiber leather base fabric in the past can be omitted. Thus, on the one hand, the production process of the bovine fiber leather base fabric is simplified, and on the other hand, the produced bovine fiber leather base fabric is softer and has a better hand feeling. Description of the Drawings

[0032] Figure 1 is a schematic flow chart of the preparation process of a fiber reoriented non-woven fabric compensated ultra-high physical property leather substrate of the present invention;

[0033] Figure 2 is a schematic layout diagram of a carding machine, a web laying machine and a fiber reorienting device;

[0034] Figure 3 is a schematic structural diagram of one group of circular saw blade reorienting rollers on the fiber reorienting device. Detailed Embodiments

[0035] The following will further describe the specific embodiments of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and cannot be used to limit the protection scope of the present invention.

[0036] Embodiment 1:

[0037] As Figures 1 to 3 shown is an embodiment of the preparation process of a fiber-reoriented non-woven fabric compensated ultra-high physical property leather substrate of the present invention. By laying a fiber-reoriented non-woven fiber web layer on the woven fabric to form a composite compensated laminate of the woven fabric and the fiber-reoriented non-woven fiber web layer, and then needling the composite compensated laminate to obtain an ultra-high physical property leather substrate; wherein, the fiber-reoriented non-woven fiber web layer has an upper, middle, and lower three-layer composite structure. The middle layer is an ordinary fiber web layer without fiber reorientation, and 30-70% of the fibers in the upper and lower layers have been reoriented and their fiber directions are changed to be arranged along the longitudinal direction of the woven fabric.

[0038] As one of the preferred solutions for the woven fabric in this embodiment, the woven fabric is a TC woven fabric.

[0039] As another preferred solution for the woven fabric in this embodiment, the woven fabric is a mixed fiber woven fabric.

[0040] As one of the preferred solutions for the fiber-reoriented non-woven fiber web layer in this embodiment, the fiber-reoriented non-woven fiber web layer is a fiber-reoriented non-woven fiber web layer made of cotton fibers as raw materials.

[0041] As another preferred solution for the fiber-reoriented non-woven fiber web layer in this embodiment, the fiber-reoriented non-woven fiber web layer is a fiber-reoriented non-woven fiber web layer made of mixed fibers as raw materials.

[0042] In this embodiment, the forming steps of the fiber-reoriented non-woven fiber web layer are as follows:

[0043] (1) Carding and web forming: After the raw materials are proportioned, opened, and mixed, the mixed raw materials are carded into a thin fiber web by a carding machine;

[0044] (2) Z-shaped alternating reciprocating web laying: Using a web laying machine, the thin fiber web formed by carding and web forming is laid by Z-shaped alternating reciprocating web laying to form a thick fiber web by overlapping;

[0045] (3) Fiber reorientation of the thick fiber web: The thick fiber web formed by Z-shaped alternating reciprocating web laying is conveyed to a fiber reorientation device. By using several groups of annular saw blade reorientation rollers rotatably arranged on the fiber reorientation device, the upper and lower part fibers of the thick fiber web are reoriented, so that 30-70% of the fibers in both the upper and lower part fibers are converted to be arranged along the longitudinal direction of the thick fiber web, thereby forming the fiber reoriented non-woven fiber web layer.

[0046] In this embodiment, in the forming step (3) of the fiber reoriented non-woven fiber web layer, each group of annular saw blade reorientation rollers includes a front annular saw blade reorientation roller, a middle annular saw blade reorientation roller, and a rear annular saw blade reorientation roller arranged in sequence along the forward conveying direction of the thick fiber web. Moreover, the front annular saw blade reorientation roller and the rear annular saw blade reorientation roller are in contact with the lower surface of the thick fiber web, and the middle annular saw blade reorientation roller is in contact with the upper surface of the thick fiber web; wherein, the rotational direction of the front annular saw blade reorientation roller points forward in the tangential direction at the contact part with the thick fiber web, and the rotational directions of the front annular saw blade reorientation roller and the middle annular saw blade reorientation roller point backward in the tangential direction at the contact part with the thick fiber web, thereby forming the fiber reorientation operation of the thick fiber web.

[0047] Preferably, the annular saw blade reorientation roller includes a roller body and annular saw blades arranged at intervals on the outer circle of the roller body. The outer circle of the annular saw blade is densely covered with saw teeth. In the forming step (3) of the fiber reoriented non-woven fiber web layer, the depth at which the saw teeth on the annular saw blade penetrate into the thick fiber web is 1 / 6 - 1 / 3 of the thickness of the thick fiber web.

[0048] Preferably, the number of groups of the annular saw blade reorientation rollers is 6 - 15 groups.

[0049] Preferably, the annular saw blades on the annular saw blade reorientation rollers within the same group have corresponding consistent axial positions on the annular saw blade reorientation rollers.

[0050] Preferably, the annular saw blades on the annular saw blade reorientation rollers not within the same group are arranged staggeredly with each other axially on the annular saw blade reorientation rollers.

[0051] In this embodiment, the lapping machine is respectively provided with a thin fiber web input channel for docking with the carding machine and a thick fiber web output channel for docking with the fiber reorientation device. Moreover, the thin fiber web input channel and the thick fiber web output channel are perpendicular to each other, and the reciprocating direction of the Z-shaped alternating reciprocating web laying is set transversely with respect to the thick fiber web output channel.

[0052] In this embodiment, when the composite compensation type laminate is needled, through three passes of needle punching and straight needling operations, the fiber reoriented non-woven fabric compensation type ultra-high physical property leather substrate is formed.

[0053] In this embodiment, cowhide fibers are laid on the ultra-high physical property leather substrate, and after hydroentangling and drying, the cowhide fiber base fabric is obtained.

[0054] Example 2:

[0055] Using the preparation process of a fiber reoriented non-woven fabric compensated ultra-high physical property leather substrate in Example 1, the woven fabric uses a TC woven fabric with a gram weight of 50 g / m², and the fiber reoriented non-woven fiber web layer uses a cotton fiber reoriented non-woven fiber web layer with a gram weight of 50 g / m². After the two are laminated and subjected to three passes of needle punching in the forward direction, an ultra-high physical property leather substrate is obtained. It is tested on a tear strength testing machine, and the measured tear strength is 9 Kgf.

[0056] Example 3:

[0057] Using a finished TC woven fabric with a gram weight of 50 g / m² and a finished cotton fiber non-woven fabric with a gram weight of 50 g / m², after the two are laminated and subjected to three passes of needle punching in the forward direction, a leather substrate for test comparison is obtained. It is tested on a tear strength testing machine, and the measured tear strength is 7 Kgf.

[0058] Example 4:

[0059] Using two pieces of finished TC woven fabric with a gram weight of 50 g / m², after the two pieces of TC woven fabric are laminated and subjected to three passes of needle punching in the forward direction, a leather substrate for test comparison is obtained. It is tested on a tear strength testing machine, and the measured tear strength is 6 Kgf.

[0060] Comparing Example 2 with Example 3 and Example 4 above, it can be seen that the tear strength of Example 2 is increased by 28.6% compared with Example 3, and the tear strength of Example 2 is increased by 50% compared with Example 4.

[0061] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A preparation process for a fiber reorientation non-woven fabric compensated ultra-high physical property leather substrate, characterized in that, By laying a fiber - redirected non - woven fiber web layer on a woven fabric, a composite compensation - type laminate of the woven fabric and the fiber - redirected non - woven fiber web layer is formed, and then the composite compensation - type laminate is needled to obtain a super - high - property leather substrate; wherein, the fiber - redirected non - woven fiber web layer has an upper, middle, and lower three - layer composite structure. The middle layer is an ordinary fiber mat layer without fiber redirection, and 30 - 70% of the fibers in each of the upper and lower layers are redirected so that their fiber directions are arranged along the longitudinal direction of the woven fabric; the forming steps of the fiber - redirected non - woven fiber web layer are as follows: (1) Carding and web - forming: After the raw materials are proportioned, opened, and mixed, the mixed raw materials are carded into a thin fiber web by a carding machine; (2) Z - shaped alternating reciprocating web - laying: Using a web - laying machine, the thin fiber web formed by carding and web - forming is laid in a Z - shaped alternating reciprocating manner to form a thick fiber web by overlapping; (3) Fiber redirection of the thick fiber web: The thick fiber web formed by Z - shaped alternating reciprocating web - laying is conveyed to a fiber - redirection device. By using several groups of annular saw - blade redirection rollers rotatably arranged on the fiber - redirection device, the upper - layer part fibers and the lower - layer part fibers of the thick fiber web are redirected, so that 30 - 70% of the fibers in each of the upper - layer part fibers and the lower - layer part fibers are redirected to be arranged along the longitudinal direction of the thick fiber web, thereby forming the fiber - redirected non - woven fiber web layer.

2. The preparation process of a fiber reorientation non-woven fabric compensating ultra-high physical property leather substrate according to claim 1, characterized in that, The woven fabric is a TC woven fabric.

3. The preparation process of a fiber-reoriented non-woven fabric compensated ultra-high physical property leather substrate according to claim 1, characterized in that, The woven fabric is a mixed - fiber woven fabric.

4. The preparation process of a fiber reorientation non-woven fabric compensating ultra-high physical property leather substrate according to claim 1, characterized in that The fiber - redirected non - woven fiber web layer is a fiber - redirected non - woven fiber web layer made of cotton fibers as raw materials.

5. The preparation process of a fiber reorientation non-woven fabric compensated ultra-high physical property leather substrate according to claim 1, characterized in that, The fiber - redirected non - woven fiber web layer is a fiber - redirected non - woven fiber web layer made of mixed fibers as raw materials.

6. The preparation process of a fiber reorientation non-woven fabric compensated ultra-high physical property leather substrate according to claim 1, characterized in that, In the forming step (3) of the fiber - redirected non - woven fiber web layer, each group of annular saw - blade redirection rollers includes a front annular saw - blade redirection roller, a middle annular saw - blade redirection roller, and a rear annular saw - blade redirection roller arranged in sequence according to the forward conveying direction of the thick fiber web. The front annular saw - blade redirection roller and the rear annular saw - blade redirection roller are in contact with the lower surface of the thick fiber web, and the middle annular saw - blade redirection roller is in contact with the upper surface of the thick fiber web; wherein, the rotation direction of the front annular saw - blade redirection roller points forward in the tangential direction at the contact part with the thick fiber web, and the rotation directions of the front annular saw - blade redirection roller and the middle annular saw - blade redirection roller point backward in the tangential direction at the contact part with the thick fiber web, thereby forming the fiber - redirection operation of the thick fiber web.

7. The preparation process of a fiber reorientation non-woven fabric compensating ultra-high physical property leather substrate according to claim 6, characterized in that The annular saw - blade redirection roller includes a roller body and annular saw blades arranged at intervals on the outer circle of the roller body. The outer circle of the annular saw blade is densely covered with saw teeth. In the forming step (3) of the fiber - redirected non - woven fiber web layer, the depth at which the saw teeth on the annular saw blade penetrate into the thick fiber web is 1 / 6 - 1 / 3 of the thickness of the thick fiber web.

8. The preparation process of a fiber reorientation non-woven fabric compensated ultra-high physical property leather substrate according to claim 1, characterized in that, On the web - laying machine, there are respectively arranged a thin fiber web input channel for docking with the carding machine and a thick fiber web output channel for docking with the fiber - redirection device, and the thin fiber web input channel and the thick fiber web output channel are perpendicular to each other. The reciprocating direction of the Z - shaped alternating reciprocating web - laying is set transversely with respect to the thick fiber web output channel.

9. The preparation process of a fiber reorientation non-woven fabric compensating ultra-high physical property leather substrate according to claim 1, characterized in that, When the composite compensation type laminate is needled, through three needling operations in the forward direction, the fiber reorientation non-woven compensation type ultra-high physical property leather substrate is formed.

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