COMPRESSION KNIT PART, COMPRESSION GARMENT, DYEING METHOD FOR COMPRESSION KNIT PART, AND PRODUCTION METHOD FOR DYED COMPRESSION GARMENT

Abstract

A compression knit part composed of a compression knit including a first ground thread and a second ground thread, wherein the first ground thread is composed at least at its surface of a manufactured polyamide fiber that accepts a first dye but not a second dye, and the second ground thread is composed at least at its surface of a manufactured polyester fiber which accepts the second dye but not the first, and a weft thread configured as compression thread.

Claims

1. A compression knit part made of a compression knit comprising: a first ground thread and a second ground thread, wherein the first ground thread is composed at least at its surface of a manufactured polyamide fiber that accepts a first dye but not a second dye, and the second ground thread is composed at least at its surface of a manufactured polyester fiber which accepts the second dye but not the first dye; and a weft thread configured as compression thread.

2. The compression knit part according to claim 1, wherein the threads are still undyed.

3. The compression knit part according to claim 1, wherein the compression thread comprises a thread core, especially of elastane, overwrapped with the same manufactured fiber as one of the ground threads, especially the polyamide ground fiber of the first ground thread.

4. The compression knit part according to claim 3, wherein the compression thread has a different dye affinity from the ground thread including the same manufactured fiber, in respect of the corresponding dye, to create on dyeing a tone-on-tone effect with regard to the corresponding dye.

5. The compression knit part according to claim 4, wherein the different dye affinity is realized by a different surface structure of the compression thread as compared with the ground thread including the same manufactured fiber.

6. The compression knit part according to claim 1, wherein at least one of the ground threads includes a thread core, especially of elastane, overwrapped with the corresponding manufactured fiber, and/or in that the manufactured polyester fiber is composed of cationically dyeable polyester.

7. The compression knit part according to claim 1, wherein one of the ground threads is a pattern-conferring patterning thread which lies in front of the other ground thread on a face side of the compression knit.

8. The compression knit part according to claim 7, wherein the ground thread forming the patterning thread and the other ground thread are knitted in a plain construction and in a rib construction, respectively.

9. The compression garment comprising a compression knit part according to claim 1.

10. A method of dyeing a compression knit part according to claim 1 in a one-bath dyeing process, comprising the steps of: pretreating the compression knit part, admixing the first dye for the manufactured polyamide fibers into an employed liquor and dyeing the compression knit part at one or more than one first temperature, awaiting the end of a first dyeing time span, admixing the second dye in a color other than that of the first dye to the liquor and heating up the liquor, dyeing at one or more than one second temperature which is higher than the first temperature but not more than 97 C. in a second dyeing time span, and aftertreating the compression knit part, wherein a dye-separating agent is used to separate the first and second dyes.

11. The method according to claim 10, wherein the first dye used is an anionic dye for dyeing the manufactured polyamide fibers, the second dye used is a cationic dye for dyeing the cationically dyeable manufactured polyester fibers, and/or the dye-separating agent used is a leveling agent.

12. A method of producing a dyed compression knit part, comprising the steps of: providing and storing an undyed compression knit part according to claim 1; and receiving a color request describing two colors to be used and dyeing the compression knit part as per the color request in a method including the steps of: pretreating the compression knit part, admixing the first dye for the manufactured polyamide fibers into an employed liquor and dyeing the compression knit part at one or more than one first temperature, awaiting the end of a first dyeing time span, admixing the second dye in a color other than that of the first dye to the liquor and heating up the liquor, dyeing at one or more than one second temperature which is higher than the first temperature but not more than 97 C. in a second dyeing time span, and aftertreating the compression knit part, wherein a dye-separating agent is used to separate the first and second dyes.

Description

BRIEF DESCRIPTION OF THE DRAWING

[0046] In the drawing:

[0047] FIG. 1 shows a basic sketch of a compression knit part according to the invention,

[0048] FIG. 2 shows a first view of the compression knit of the compression knit part of FIG. 1,

[0049] FIG. 3 shows a second view of the compression knit of the compression knit part of FIG. 1,

[0050] FIG. 4 shows a dyeing curve of a dyeing method according to the invention, and

[0051] FIG. 5 shows a flowchart for the production method of the invention.

DETAILED DESCRIPTION OF THE INVENTION

[0052] FIG. 1 shows a basic sketch of a compression knit part 1 according to the invention, which here forms a compression garment in the form of a compression stocking. The compression stocking 2 consists of the employed compression knit 3, merely suggested in FIG. 1 and more particularly depicted in FIGS. 2 and 3, and thereby develops a specific, intentional compressive effect on the covered regions of the body, particularly for therapeutic purposes. The compression stocking is more particularly assigned one of the familiar, standardized, four compression classes.

[0053] FIGS. 2 and 3 show the compression knit 3 in greater detail, the right side of the fabric in each case, FIG. 2 being a view from the viewing direction, i.e., a view of the face side, FIG. 3 being a view of the inside surface of compression stocking 2.

[0054] As FIG. 2 shows, the compression knit 3 comprises three types of threads, namely a first ground thread 4, a second ground thread 5, which forms a patterning thread, and a compression thread 6, which are extended on the right-hand side beyond the section of compression knit 3 to clarify their course. Plainly, the ground thread 5 forming the patterning thread is shown by FIG. 2 to lie on the outside in the direction of the face side, i.e., particularly above the compression threads 6 incorporated as weft threads. The ground thread 4 is located behind the compression thread 6. Accordingly, cf. FIG. 3, it is apparent when viewed from the inside surface that the ground thread 5 lies behind the compression threads 6, i.e., on the outside.

[0055] The first ground thread 4 and the second ground thread 5 have different constructions here. While both include an elastane core as thread core, the ground thread 4 is overwrapped by a manufactured polyamide fiber and the ground thread 5 is overwrapped by cationically dyeable polyester. Hence the ground threads 4 and 5 have different properties in respect of dyeability. To wit, the ground thread 4 is by virtue of the manufactured polyamide fiber solely dyeable by anionic dyes (acid dyes) as first dye, not accepting cationic dyes as second dye. By contrast, the ground thread 5 is solely dyeable by cationic dyes as second dyes on account of its surface consisting of manufactured cationically dyeable polyester fiber. The latter in turn does not accept anionic dyes.

[0056] Here the compression thread 6 is also integrated in this dyeability concept. Since the compression thread 6 itself consists of elastane overwrapped with manufactured polyamide fiber, it accordingly also accepts anionic dyes, hence the first dyes. In the present working example, the compression thread 6 and the ground thread 4 also differ in their surface structures, which is accomplished via the number of overwraps with the manufactured polyamide fiber and/or different pre-tensions. This creates a tone-on-tone effect on dyeing with the first dye, since the compression thread 6 and the ground thread 4 differ in the degree to which they accept the first dye. Working examples are also conceivable where the compression thread 6 and the ground thread 4 are provided an identical surface structure.

[0057] In a dyeing method according to the invention, the compression knit part is dyed by using a first dye and a second dye, for which dyes having different colors are used. In said method, an in-principle known step of preparation is followed by a step of one-bath dyeing absolutely without superatmospheric pressure, which is followed by the in-principle known postprocessing step.

[0058] FIG. 4 shows a dyeing curve for a working example of the dyeing method according to the invention.

[0059] There the actual dyeing process, involving the use of an appropriate liquor, starts at a time 7, where the liquor, which already contains the compression knit part 1, is admixed with a wetting agent or the prepared liquor containing the wetting agent is entered with the compression knit part. The liquor temperature is initially 60 C. The compression knit part is exposed to the wetting agent for 20 minutes before at a time 8 in-principle known dyeing auxiliaries are added, but additionally also a dye-separating agent. The dye-separating agent used here is a specific leveling agent, especially the abovementioned Rucogal CDP. At a time 9 there then follows the admixture of acid donors to establish the liquor pH. These acid donors are effective in causing acid to be released over time with increasing temperature, so a pH of 3 is reached on reaching the end temperature of in this case 96 C.

[0060] A time 10 then finally sees the admixture of the first dye for the manufactured polyamide fiber. The temperature of 60 C. is additionally maintained for five minutes before heating to a temperature of 75 C. in the course of a further five minutes. Throughout the entire period, the compression knit part 1 is agitated in the liquor. The period between times 10 and 11 marks a first dyeing time span. The first dye in the form of an anionic dye (acid dye) will exhaust onto the manufactured polyamide fiber even at just 60 C. and a slightly acidic pH.

[0061] Time 11 is then the time for adding the second dye for the manufactured cationic polyester fiber, so the anionic first dye and the cationic second dye will then both be present in the liquor, yet there will not be any significant interactions, since this is prevented by the dye-separating agent. In the course of the second dyeing time span then starting, the temperature is initially maintained at 75 C. for 15 minutes before it is raised to 96 C., following which the second dyeing time span is continued for 45 minutes during which the compression knit part continues to be agitated in the liquor. Since the second temperature remains below 97 C. throughout the second dyeing time span, dyeing accordingly takes place without superatmospheric pressure. The cationic second dye requires a lower pH, which occurs at just 75 C. as a result of acid being released by the acid donor, so the exhaustion of the second dye onto the manufactured polyester fiber commences. Over time, as the temperature increases, more acid is released by the acid donor, gradually raising the affinity of the dyes until the final pH of three is reached.

[0062] After a cooling process, the time 12 marks the start for the abovementioned aftertreatment of the compression knit part 1.

[0063] FIG. 5 shows a flowchart for a working example of a method for producing a dyed compression knit part 1. A step S1 comprises providing and inventoring the still undyed compression knit part 1. A step S2 comprises checking whether a color request 13describing colors to be used in dyeinghas already been received for the compression knit part. If so, the compression knit part 1 is dyed in step S3 in accordance with the color request 13 in the manner described with regard to the dyeing method.

[0064] While specific embodiments of the invention have been shown and described in detail to illustrate the inventive principles, it will be understood that the invention may be embodied otherwise without departing from such principles.