Post-consumer regenerated polyester-friendly fabric and preparation method thereof

Abstract

The invention provides a post-consumption regenerated polyester-friendly fabric and a preparation method thereof.The fabric is knitted through a double-faced machine, the fabric is of a knitted structure with two needle passages of an upper needle dial and two needle passages of a lower needle cylinder, and the fabric comprises two yarn filaments which are circularly arranged; the two paths of yarns are different specifications of post-consumption regenerated polyester fibers, and the first path is formed by weaving the post-consumption regenerated polyester fibers of the first specification into the inner layer of the fabric; the second path adopts an outer layer of the fabric woven by the post-consumption regenerated polyester fibers of a second specification; according to the post-consumption regenerated polyester friendly fabric and the preparation method thereof, the structural arrangement of the prepared fabric can be effectively simplified, the preparation method of the fabric is optimized, the preparation efficiency of the fabric is improved, the preparation cost of the fabric is reduced, and the preparation quality of the fabric is improved.

Description

Technical Field

[0001] The present invention relates to the field of textile technology, in particular to a post-consumer recycled polyester-friendly fabric and a preparation method thereof. Background Art

[0002] With the rapid development of the times, people's consumption level continues to improve, and various types of clothing fabrics continue to emerge like mushrooms after rain. At present, there are many unsalable fabrics and clothing on the market, and consumers' ability to update and iterate is improving. There are more and more discarded clothing. The recycling of these unsalable discarded clothing is one of the problems that need to be solved urgently. At present, there are many kinds of methods for recycling discarded clothing, and most of them are usually to prepare discarded clothing into new multifunctional fabrics. However, the preparation process of existing multifunctional fabrics is relatively cumbersome, and the structure of the fabric is relatively complex, which makes the fabric preparation cost high and the preparation efficiency low. Therefore, it is of great significance to study how to improve the preparation efficiency of fabrics and reduce the preparation cost of fabrics.

[0003] Patent CN115717295B discloses a method for preparing graphene underwear fabrics for warmth preservation, antibacterial, and far-infrared heating. The graphene composite thermal insulation fabrics are composed of a graphene honeycomb layer, a hollow thermal insulation layer, and an encrypted temperature-locking layer. The preparation method adopted is A1: using graphene polyester fiber, spandex, and modal man-made fiber; A2: weaving equipment and structure: using triangles and rows of needles for three-layer weaving on a double-sided circular knitting machine; A3: dyeing and finishing: A4: making graphene underwear fabrics for warmth preservation, antibacterial, and far-infrared heating according to the required width and square meter weight. Through the setting of the multi-layer structure, the fabric can have the characteristics of warmth preservation, breathability, and comfort. However, due to the complex composition structure of the fabric and the complicated arrangement of the knitting needles, it is easy to make the cost of preparing this kind of fabric high and the preparation time long.

[0004] Patent CN114230858B discloses a marine recycled fabric and its preparation method, which includes the following steps: (1) material pretreatment; (2) melt feeding; (3) alcoholysis; (4) repolymerization reaction to prepare recycled polyester; (5) spinning; (6) the semi-finished yarn bundle obtained by pre-spinning is pulled by a guide wire machine and then by a traction machine; after being pulled by a stacking machine and a crimping machine, it is preheated by a small steam box at 75-85°C and then mechanically crimped, and finally cut into short fibers that meet the requirements. The short fibers are sent to a relaxation heat setting machine for drying and setting, and finally packaged and stored by a packaging machine, colored, and woven into fabrics. The yarn can be screened multiple times to make the coloring rate higher and the fiber softer, but since the preparation process also requires the use of melt feeding and alcoholysis settings, it is still easy to increase the complexity of the preparation process. Summary of the invention

[0005] In view of this, the present invention aims to propose a post-consumer recycled polyester-friendly fabric and a preparation method thereof, so as to solve the problems existing in the prior art that the fabric prepared by recycling discarded clothing has a relatively complex fabric structure, a relatively cumbersome fabric preparation method, a low preparation efficiency, and a high preparation cost; thereby effectively simplifying the structural setting of the prepared fabric, optimizing the fabric preparation method, improving the fabric preparation efficiency, reducing the fabric preparation cost, and improving the fabric preparation quality.

[0006] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0007] The invention relates to a post-consumer recycled polyester-friendly fabric and a preparation method thereof. The post-consumer recycled polyester-friendly fabric is woven by a double-sided machine, and the fabric adopts a weaving structure with two needle tracks of an upper needle disk and two needle tracks of a lower needle cylinder. The fabric comprises two yarns arranged in a cycle; the two yarns are post-consumer recycled polyester fibers of different specifications, wherein the first yarn is woven with post-consumer recycled polyester fibers of a first specification into an inner layer of the fabric; and the second yarn is woven with post-consumer recycled polyester fibers of a second specification into an outer layer of the fabric.

[0008] Furthermore, the post-consumer recycled polyester fiber is DTY post-consumer recycled polyester.

[0009] Furthermore, the 2-way yarn has a minimum repetition weaving structure.

[0010] Further, the first specification is 75D / 72F.

[0011] Furthermore, the second specification is 50D / 24F.

[0012] Furthermore, the weight percentages of pre-consumer recycled polyester and post-consumer recycled polyester in the yarn configured in the inner layer of the fabric are a%, b%, respectively, and a%+b%=1.

[0013] Furthermore, the knitting needles of the upper needle disc and the lower needle cylinder of the double-sided machine are arranged in a staggered and cyclic arrangement of low-high-heel needles.

[0014] Furthermore, the weaving structure of the two-way yarn is arranged in the order from the upper needle disc to the lower needle cylinder: the first route is upper needle floating thread, upper needle circle, lower needle circle, and lower needle floating thread; the second route is upper needle circle, upper needle floating thread, lower needle floating thread, and lower needle circle.

[0015] A method for preparing a post-consumer recycled polyester-friendly fabric, the method is used to prepare the post-consumer recycled polyester-friendly fabric; the method comprises the following steps:

[0016] Step 1: Raw material selection: Select post-consumer recycled polyester fibers of different specifications;

[0017] Step 2: Fabric structure setting: Weaving different specifications of post-consumer recycled polyester fibers into the required fabrics through textile equipment;

[0018] Step 3: Dyeing and finishing: Use equipment to dye and finish the fabric;

[0019] Step 4: Post-finishing and shaping: Use the required dyeing and finishing formula to perform post-finishing and shaping treatment on the fabric to obtain the required friendly fabric.

[0020] Further, step three includes:

[0021] Step S31: dyeing: immersing the fabric in a dye bath with a preset pH value at a preset heating rate, adding a dyeing auxiliary agent to the dye bath, and dyeing the fabric;

[0022] Step S32: slitting and sorting the cloth;

[0023] Step S33: Drying: drying the fabric in a drying machine;

[0024] Step S34: Spreading and shaping: Spreading the dried fabric, and adopting the required environmentally friendly finishing formula to perform post-shaping and shaping treatment on the fabric to obtain the required friendly fabric.

[0025] Compared with the prior art, the post-consumer recycled polyester-friendly fabric and preparation method thereof described in the present invention have the following beneficial effects:

[0026] By setting the fabric structure and the preparation method thereof, the structural setting of the fabric preparation can be effectively simplified, the fabric preparation method can be optimized, the fabric preparation efficiency can be improved, the fabric preparation cost can be reduced, and the fabric preparation quality can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings, which constitute part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations of the present invention.

[0028] In the figure:

[0029] Figure 1 It is a schematic diagram of the triangle arrangement in fabric preparation;

[0030] Figure 2 It is a schematic diagram of the arrangement of knitting needles in fabric preparation;

[0031] Figure 3 It is a schematic diagram of the preparation method flow chart;

[0032] Figure 4 It is a schematic diagram of the dyeing and washing process curve. DETAILED DESCRIPTION

[0033] The inventive concepts of the present disclosure will be described below using terms commonly used by those skilled in the art to convey the essence of their work to other persons skilled in the art. However, these inventive concepts can be embodied in many different forms and should not be considered limited to the embodiments described herein.

[0034] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0035] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0036] This embodiment is directed to textile fabrics, and similar to conventional textile fabrics, the overall structure is composed of threads and textile machines.

[0037] In the prior art, there are many unsalable fabrics and clothing on the market, and consumers' ability to upgrade is improving, so there are more and more discarded clothing. There are many ways to recycle discarded clothing, and most of them are to prepare new multifunctional fabrics from discarded clothing. However, the preparation process of existing multifunctional fabrics is relatively cumbersome, and the structure of the fabric is relatively complex, which leads to the problem of high fabric preparation cost and low preparation efficiency.

[0038] In order to solve the problems of the fabrics prepared by recycling discarded clothing in the prior art, which have complex fabric structures, cumbersome fabric preparation methods, low preparation efficiency, and high preparation costs; this embodiment proposes a post-consumer recycled polyester-friendly fabric and a preparation method thereof, wherein the post-consumer recycled polyester-friendly fabric is woven using a double-sided machine, and the fabric adopts a weaving structure with two needle tracks on the upper needle plate and two needle tracks on the lower needle cylinder, and the fabric includes two yarns arranged in a loop. The two yarns are post-consumer recycled polyester fibers of different specifications, wherein the first yarn is woven with post-consumer recycled polyester fibers of the first specification into the inner layer of the fabric; the second yarn is woven with post-consumer recycled polyester fibers of the second specification into the outer layer of the fabric. The post-consumer recycled polyester fiber is DTY post-consumer recycled polyester.

[0039] By setting the weaving structure of the fabric, the fabric structure can be simplified, the fabric preparation efficiency can be improved, the fabric wear resistance can be enhanced, the low-cost preparation of the fabric can be guaranteed, and the quality of the fabric can be improved, so that the fabric developed and prepared through independent innovation can adapt to environmental trends, cater to market consumption, and achieve material reuse as much as possible, thereby reducing resource consumption. It can also expand the market for environmentally friendly post-consumer recycled polyester fabrics in combination with the current consumption situation.

[0040] Specifically, the first route uses DTY post-consumer recycled polyester of the first specification to weave the inner layer of the fabric, and the second route uses DTY post-consumer recycled polyester of the second specification to weave the outer layer of the fabric. In this embodiment, the 2-way yarn is a minimum cycle weaving structure. Among them, the first specification is 75D / 72F, and the second specification is 50D / 24F. In addition, the weight percentages of pre-consumer recycled polyester and post-consumer recycled polyester in the yarn configured in the inner layer of the fabric are a%, b%, a%+b%=1 respectively. The weight ratios of pre-consumer recycled polyester and post-consumer recycled polyester in the yarn configured in the outer layer of the fabric are c%, d%, c%+d%=1 respectively. The values ​​of a, b, c, and d are specifically set according to the requirements. Preferably, for a yarn with a first specification of 75D / 72F, the percentage of pre-consumer recycled polyester yarn in the total recycled polyester weight is a%, a%=70%, and the percentage of post-consumer recycled polyester yarn in the total recycled polyester weight is b%, b%=30%.

[0041] Through the setting of different specifications of DTY post-consumer recycled polyester, we can not only ensure the comfort, softness and skin-friendly properties of the fabric, but also reuse discarded clothes to the greatest extent, reduce the waste of resources and improve the protection of the environment.

[0042] In addition, the knitting needle arrangement of the upper needle disc and the lower needle cylinder of the double-sided machine is arranged in the form of a staggered cycle of low and high heel needles, that is, 1 low heel needle and 1 high heel needle are arranged in a staggered cycle. As shown in the figure, the knitting needle arrangement is in the form of 2 rows × 4 columns; the knitting structure of the 2-way yarn is arranged in the order from the upper needle disc to the lower needle cylinder: the first route is upper needle floating thread, upper needle looping, lower needle looping, and lower needle floating thread; the second route is upper needle looping, upper needle floating thread, and lower needle floating thread , the lower needle forms a circle; in this embodiment, the upper needle forms a circle as shown by "∨" in the triangular arrangement diagram, and the floating line is as shown by "—" in the triangular arrangement diagram, wherein, when "—" is located in the upper needle disk, it is called the upper needle floating line, and when "—" is located in the lower needle cylinder, it is called the lower needle floating line. The lower needle forms a circle as shown by "∧" in the triangular arrangement diagram, the odd-numbered weaving paths are fed into the yarn of the inner layer (i.e., the inner layer of the fabric), and the even-numbered weaving paths are fed into the yarn of the outer layer (i.e., the outer layer of the fabric). In addition, in this embodiment, as Figure 2 As shown, 1-2 in the bottom row of the column numbers in the figure refers to 1-2 yarn weaving.

[0043] By adopting a low-high-heel staggered arrangement of knitting needles, the efficiency of fabric knitting can be effectively improved, the fabric can be mass-produced, and the fabric can be prepared quickly and stably. It can also effectively simplify the structure of knitting needle arrangement, improve the operating efficiency of knitting needles, and increase the rate of fabric production. The coordination of the inner and outer fabrics is conducive to improving the breathability of the friendly fabric, improving the aesthetics and comfort of the fabric, and ensuring the flatness of the fabric.

[0044] A method for preparing a post-consumer recycled polyester-friendly fabric, the method is used to prepare the post-consumer recycled polyester-friendly fabric, the method comprising the following steps:

[0045] Step 1, selection of raw materials: according to the fabric structure requirements to be prepared, select post-consumer recycled polyester fibers of different specifications, wherein the post-consumer recycled polyester fibers are DTY post-consumer recycled polyester;

[0046] Step 2: Setting the fabric structure: Weaving different specifications of post-consumer recycled polyester fibers, namely DTY post-consumer recycled polyester, into the required fabrics through textile equipment; the fabric structure adopts any one or more of the cotton wool and napped double-sided fabric structures.

[0047] Step 3: Dyeing and finishing: Use imported equipment to dye and finish the fabrics;

[0048] Step 4: Post-finishing and shaping: Use the required dyeing and finishing formula to perform post-finishing and shaping treatment on the fabric to obtain the required friendly fabric.

[0049] By setting up the method, the preparation method of the fabric can be effectively optimized, the preparation efficiency of the fabric can be improved, the preparation cost of the fabric can be reduced, and the preparation quality of the fabric can be improved.

[0050] Step 2 includes:

[0051] Step S21: Setting the fabric structure: analyzing the prepared fabric structure and setting the double-sided structure;

[0052] Step S22: selecting weaving equipment, combining the special properties of the yarn, and selecting the combination of the yarn according to the machine gauge of the weaving equipment, and weaving different specifications of DTY post-consumer recycled polyester into the required fabric through the textile equipment.

[0053] Among them, in step S22, the machine gauge of the weaving equipment is 28-32 needles / cm; the lower needle cylinder diameter of the weaving equipment is any one of 30″ and 34″. The machine speed of the weaving equipment is 20-22r / min. The coil length of the weaving equipment ranges from 11mm to 13mm, and the coil length is calculated in units of 50 coils. The gram weight of the prepared fabric blank ranges from 120g to 140g. In this embodiment, the specific changes in yarn count and coil, and the changes in fabric structure are all set according to requirements.

[0054] After analyzing the fabric structure, weaving on demand can effectively realize the rapid preparation of fabrics, and is also conducive to controlling the speed of fabric weaving and reducing the occurrence of errors in the weaving process, thereby improving the quality of the fabric and making the fabric surface comfortable, soft and skin-friendly.

[0055] Step three includes:

[0056] Step S31: dyeing: immersing the fabric in a dye bath with a preset pH value at a preset heating rate, adding a dyeing auxiliary agent to the dye bath, and dyeing the fabric at least once;

[0057] Step S32: slitting and sorting the fabric: after the dyed fabric is reduced and cleaned, the fabric is slitting and sorting the fabric according to the required fabric size;

[0058] Step S33: Drying: Drying the fabric using an imported drying machine;

[0059] Step S34: Spreading and shaping: Spreading the dried fabric, and adopting the required environmentally friendly finishing formula to perform post-shaping and shaping treatment on the fabric to obtain the required friendly fabric.

[0060] Among them, in step S31, after each dyeing process, the temperature rise rate and the pH value of the dye bath can be adjusted in real time according to the color state of the fabric to ensure the stability and reliability of the fabric dyeing. In addition, during the dyeing process, the dyeing auxiliary is added to the dye bath in small batches to prevent the occurrence of uneven dyeing. In addition, since the fabric in this application is a polyester knitted fabric, the dyeing process used for dyeing the fabric in step S31 is a one-bath process. The curve diagram of this process is as follows Figure 4 As shown. The specific process formula is as follows: 2% disperse dye, 0.3g / L glacial acetic acid, 0.25g / L leveling agent, 0.3g / L sodium acetate. During the dyeing process, the temperature of the dye bath is 120℃±T0, T0 is the preset temperature deviation value, T0 is a positive number; the specific value of T0 is set as required. The bath ratio between the dyed fabric and the dye bath is 1:10.

[0061] By real-time monitoring of the heating rate during dyeing and flexible setting of the heating rate, it is possible to effectively avoid the color of the finished product affected by improper heating rate, and avoid problems such as color spots and uneven dyeing. In addition, by controlling the pH value of the dye bath, the stability of fabric dyeing can be improved, the dye bath can be guaranteed to reach the best dyeing conditions, and the dyeing efficiency of the fabric can be improved. The problem of uneven dyeing can be prevented by adding a small amount of dyeing auxiliaries in batches. Washing the fabric after dyeing, especially after dyeing with disperse dyes, can effectively remove the floating color on the fabric and avoid the reduction of the friction color fastness of the finished fabric due to floating color. Thereby greatly improving the quality of the fabric. In addition, by combining the dyeing and finishing process with the setting of imported equipment, it can be ensured that the fiber is not further damaged during the dyeing and finishing production process, and the physical properties of the fabric can be improved. By setting an environmentally friendly post-finishing formula, fabric impurities can be effectively removed and the fabric surface quality can be improved.

[0062] In step S32, the chemical reagents used in the reduction cleaning formula are caustic soda flakes and hydrosulfur powder. The amount of caustic soda flakes is 2.0 g / L; the amount of hydrosulfur powder is in the range of 2 g / L-3 g / L.

[0063] By setting the reduction cleaning formula, it is possible to effectively avoid the problem of floating color on the surface of the fabric and low color fastness of the finished product due to the low hydrophilicity of polyester fibers dyed with disperse dyes, and it can also improve the color fastness and stability of dyeing. In addition, the condition for reduction cleaning is that it must be carried out after dyeing, especially when dyeing dark colors, it is necessary to carry out reduction cleaning after dyeing to better improve the color fastness.

[0064] In the present invention, any textile fabric may include a post-consumer recycled polyester-friendly fabric structure as described in this embodiment, and based on the relevant structures and assembly relationships of recycled polyester and napped double-sided fabrics of different specifications provided in this embodiment, the textile fabric also includes conventional components including wires, textile machines and other structures; in view of the fact that they are all prior art, they will not be described in detail here.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A post-consumer recycled polyester friendly fabric, characterized in that: The fabric is woven using a double-sided machine, and the fabric adopts a weaving structure with two needle tracks on the upper needle disk and two needle tracks on the lower needle cylinder. The fabric includes two yarns arranged in a loop; the two yarns are post-consumer recycled polyester fibers of different specifications, among which the first yarn is woven with post-consumer recycled polyester fibers of the first specification into the inner layer of the fabric; the second yarn is woven with post-consumer recycled polyester fibers of the second specification into the outer layer of the fabric.

2. A post-consumer recycled polyester-friendly fabric according to claim 1, characterized in that: The post-consumer recycled polyester fiber is DTY post-consumer recycled polyester.

3. The post-consumer recycled polyester-friendly fabric according to claim 1, characterized in that: The 2-way yarn is a minimum-recurring braided structure.

4. The post-consumer recycled polyester-friendly fabric according to claim 1, characterized in that: The first specification is 75D / 72F.

5. The post-consumer recycled polyester-friendly fabric according to claim 1, characterized in that: The second specification is 50D / 24F.

6. The post-consumer recycled polyester-friendly fabric according to claim 1, characterized in that: The weight percentages of pre-consumer recycled polyester and post-consumer recycled polyester in the yarns configured in the inner layer of the fabric are a%, b%, and a%+b%=1 respectively.

7. The post-consumer recycled polyester-friendly fabric according to claim 1, characterized in that: The knitting needles of the upper needle disc and the lower needle cylinder of the double-sided machine are arranged in a staggered and cyclic arrangement of low-high-heel needles.

8. The post-consumer recycled polyester-friendly fabric according to claim 7, characterized in that: The weaving structure of the two-way yarn is arranged in the order from the upper needle disk to the lower needle cylinder: the first way is upper needle floating thread, upper needle circle, lower needle circle, lower needle floating thread; the second way is upper needle circle, upper needle floating thread, lower needle floating thread, lower needle circle.

9. A method for preparing post-consumer recycled polyester-friendly fabric, characterized in that: The method is used to prepare a post-consumer recycled polyester-friendly fabric according to any one of claims 1 to 8; the method comprises the following steps: Step 1: Raw material selection: Select post-consumer recycled polyester fibers of different specifications; Step 2: Fabric structure setting: Weaving different specifications of post-consumer recycled polyester fibers into the required fabrics through textile equipment; Step 3: Dyeing and finishing: Use equipment to dye and finish the fabric; Step 4: Post-finishing and shaping: Use the required dyeing and finishing formula to perform post-finishing and shaping treatment on the fabric to obtain the required friendly fabric.

10. The method for preparing a post-consumer recycled polyester-friendly fabric according to claim 9, characterized in that: The step three comprises: Step S31: dyeing: immersing the fabric in a dye bath with a preset pH value at a preset heating rate, adding a dyeing auxiliary agent to the dye bath, and dyeing the fabric; Step S32: slitting and sorting the cloth; Step S33: Drying: drying the fabric in a drying machine; Step S34: Spreading and shaping: Spreading the dried fabric, and adopting the required environmentally friendly finishing formula to perform post-shaping and shaping treatment on the fabric to obtain the required friendly fabric.

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