The present invention relates to a protective garment, in particular an undergarment or a garment including a gusset, such as a bodysuit or swimsuit, a reusable gusset that can be incorporated into a garment, and separate gusset layers, and associated methods of construction.
Sanitary products are used to absorb bodily discharge, including menstrual flow and incontinence leaks. Many of these products are disposable, for example sanitary pads, tampons and incontinence pads. Many products that are used to absorb large flows are bulky and uncomfortable for the wearer.
Some “period underwear” for everyday use has been released that is comfortable, but is designed to act as a back up garment in the case of leaks due to tampon, sanitary pad, or menstrual cup failures. Such failures often occur on heavy flow days or during changes in body position, such as whilst sleeping.
Disposable products are environmentally hazardous and there is desire to reduce waste products associated with these uses. Additionally, there is a greater risk of Toxic Shock Syndrome associated with products that are worn inside the vagina, such as tampons and menstrual cups. These products are required to be changed or emptied regularly to reduce the associated risks. However, external products, such as sanitary pads are associated with discomfort, a “plasticky feel”, a feeling of constant dampness, the need for regular changing and concerns around odour management.
The present invention seeks to provide a protective garment, or gusset that can be incorporated into a garment, or gusset layers, which are reusable and offer an alternative to existing products.
Reference to any prior art in the specification is not an acknowledgment or suggestion that this prior art forms part of the common general knowledge in any jurisdiction or that this prior art could reasonably be expected to be understood, regarded as relevant, and/or combined with other pieces of prior art by a skilled person in the art.
According to a first aspect, the present invention provides a moisture wicking layer for incorporation into a gusset for a protective garment, the gusset layer being a double knit fabric constructed from yarn, wherein a first portion of the yarns are hydrophilic and a second portion of the yarns are hydrophobic, whereby a technical face of the fabric forms an eyelet mesh utilising both hydrophilic and hydrophobic yarns and a technical back of the fabric forms an interlock utilising only hydrophilic yarns, and whereby the hydrophobic yarns only outwardly present to the technical face of the fabric, and the technical face forms eyelet openings formed by a tuck stitch being held in a repeated pattern to expose the underlying hydrophilic yarns of the technical back to wick moisture away from the technical face.
The moisture wicking layer preferably comprises absorbent cotton yarn.
Approximately 25% of the cotton yarn is preferably chemically treated to make it hydrophobic. The eyelet mesh may be made with 50% hydrophilic and 50% hydrophobic yarns. The interlock is preferably made with 100% hydrophilic yarn.
The technical face may be a 2 course repeat of 1 course hydrophilic yarn×1 course hydrophobic yarn.
According to a second aspect, there is provided a gusset for a protective garment, that includes a moisture wicking layer according to the first aspect of the invention together with a moisture absorbing layer and a moisture impermeable layer.
According to a third aspect, there is provided a protective garment with a gusset according to the second aspect of the invention.
According to a fourth aspect, the present invention provides a moisture absorbing layer for incorporation into a gusset for a protective garment, the gusset layer having a sinker terry fabric knit comprising sinker loops with plush loops protruding from the fabric knit on at least one side, wherein the plush loops are made from synthetic fibres treated with a hydrolysing enzyme that splits the fibres into fibrils.
The sinker terry fabric knit is constructed using a sinker terry knitting machine as opposed to a single construction knitting machine where loop formation is created by miss stitch.
The moisture absorbing layer may have plush loops protruding from both sides. The moisture absorbing layer may have plush loops protruding from only one side. When the plush loops protrude from only one side, the other side may be laminated with a moisture impermeable sheet, for example a polyurethane sheet.
The sinker loops may be made from polyester yarn. The plush loops may be made with a polyester/nylon yarn, which may be 80% polyester and 20% nylon. The height of the plush loops may be in the range of 1.5 mm to 3.5 mm, more preferably approximately 2.5 mm.
The hydrolysing enzyme may be sodium hydroxide. The splitting may result in the fibres being split into 4-10 times as many fibrils.
The sinker terry fabric knit is preferably 100% hydrophilic.
According to a fifth aspect, there is provided a gusset for a protective garment, that includes at least one moisture absorbing layer in accordance with the fourth aspect of the invention together with a moisture wicking layer and a moisture impermeable layer. The moisture wicking layer may be according to the first aspect of the invention.
There may be provided a gusset that includes more than one moisture absorbing layer according to the fourth aspect.
According to a sixth aspect, there is provided a protective garment with a gusset according to the fifth aspect of the invention.
According to a seventh aspect, the present invention provides a moisture impermeable layer for incorporation into a gusset for a protective garment, the gusset layer including a base fabric knit laminated with a polyurethane sheet.
The base fabric knit may be a polyester jersey.
According to an eighth aspect, there is provided a gusset for a protective garment, that includes a moisture impermeable layer according to the seventh aspect of the invention together with a moisture wicking layer and a moisture absorbing layer.
The moisture impermeable layer may extend further rearwardly than the moisture wicking layer or the moisture absorbing layer.
According to a ninth aspect, there is provided a gusset for a protective garment, that includes a moisture wicking layer according to the first aspect and a moisture impermeable layer according to the seventh aspect, together with a moisture absorbent layer.
According to a tenth aspect, there is provided a gusset for a protective garment, that includes a moisture absorbing layer according to the fourth aspect and a moisture impermeable layer according to the seventh aspect, together with a moisture wicking layer. The moisture wicking layer may be according to the first aspect.
According to an eleventh aspect, there is provided a garment having a gusset according to the eighth aspect.
According to a twelfth aspect, there is provided a garment having a gusset according to the ninth aspect.
According to a thirteenth aspect, there is provided a garment having a gusset according to the tenth aspect.
According to a fourteenth aspect, there is provided a garment having a body fabric that is a cotton/elastane jersey knit which has an odour absorption property inherent in filament of the elastane yarn. The jersey knit preferably includes 7 or more % of elastane. The garment may incorporate a gusset according to any of the above-mentioned aspects.
According to a fifteenth aspect, there is provided a garment having a body fabric that is a recycled polyester/elastane jersey knit which has an odour absorption property inherent in the filament of the elastane yarn. The jersey knit preferably includes 23 or more % elastane. The garment may incorporate a gusset according to any one of the above-mentioned aspects.
A garment made in accordance with any of the above aspects, may include a waist band and/or leg bands. Either or both of these bands may be treated or coated with a durable water repellent (DWR) to counteract compression leakage. Additionally, the thread used for sewing the gusset to the body may be coated with DWR to safe guard against compression leakage at the seams.
Further aspects of the present invention and further embodiments of the aspects described in the preceding paragraphs will become apparent from the following description, given by way of example and with reference to the accompanying drawings, in which:
b is a representative view of a section of knitting on the second face of the body fabric.
The embodiments illustrated and described are in relation to period underwear and gussets for use in period underwear. However, it will be appreciated that the underlying inventive concepts of the gusset layers can be tailored for use in other protective garments, such as incontinence underwear, reusable toddler nappies and the like.
Whilst the underwear illustrated are briefs, the protective gussets may be incorporated into other garments that sit against the skin on the lower half of the body, for example swimwear or bodysuits.
The shape of the briefs shown in
An example gusset shape is illustrated in
The gusset 18 is flared towards the rear edge 26 to minimise back bleeding over the edge. The gusset 18 may also be slightly flared towards the front edge 25 to minimise the potential for fluid to gush over the front.
The gusset 18 is made from three layers, which are positioned inside of the body fabric layer 32 that is used to create the body portion 14 of the garment 10. In
The top layer 34 is a moisture wicking layer that has a top surface 30 that sits against the wearer. The wicking layer 34 pulls fluid away from the user's skin to the core layer 36. The core layer is moisture absorbing and holds the fluid during use. The bottom layer 38 of the gusset is a moisture impermeable layer that ensures fluid does not escape onto the fabric layer 32.
In this embodiment, the top moisture wicking layer 34 is the same as the previous embodiment. To increase absorbency, there is provided two core layers 36. To reduce the chance of back bleeding staining clothing, the bottom layer 38 of moisture impermeable material has a portion 38a that extends further rearwardly than the other gusset layers. An additional internal portion of body fabric layer 32a is provided over the portion 38a to provide a comfortable surface material against the wearer's skin. This body fabric layer 32a is illustrated as rectangular, but is more likely to extend all the way to the waistband 16 and form the rear panel 22, as shown in
The details of the individual gusset layers, being a moisture wicking layer, a core moisture absorbing layer and a moisture impermeable layer, will now be described in relation to each of their own novel features. However, it will be appreciated that each of the individual gusset layers disclosed below may be exchanged with other types of moisture wicking layer, core moisture absorbing layer and moisture impermeable layer, to produce a novel gusset, and different combinations of individual layers are contemplated.
The technical face that sits against the wearer's skin is an eyelet mesh where the yarns alternate per course equally between the hydrophobic and hydrophilic yarns. The technical back that sits against the core layer, is an interlock, which only uses hydrophilic yarn. In this construction, the eyelets on the technical face create openings by a tuck stitch being held in a repeated pattern to expose the underlying hydrophilic yarns of the technical back and encourage the moisture, in particular blood, to pass through the eyelet openings and wick through to the back. The combination of 50% of the yarns on the technical face being hydrophobic and the concentration of hydrophilic wicking yarns on the technical back, discourage moisture from returning to the technical face. The use of 50% of the yarns on the technical face being hydrophilic, rather than 100% hydrophobic, encourages increased wicking across a greater surface area.
In a double knit construction, two sets of needles (dial and cylinder) are “gaited”—spaced in relation to one another, which means needles can be used at the same time to create double knit fabrics. The technical back shown in
The unique way that the hydrophobic and hydrophilic yarns are knitted create channels for moisture to move away from the skin and directional one-way wicking is achieved. For the technical face sitting against the skin, 50% of the surface repels fluid such that it is guided to the other 50% of yarn, which draws it to the back face. As the back face is 100% hydrophilic yarn, the wicking is always away from the skin. This layer may also include an anti-stain repellent finish to increase the washability of the garments. By having this 50/50 split of hydrophobic/hydrophilic yarn against the wearer's skin, rather than 100% hydrophobic, the instance of moisture pooling on the surface is greatly reduced. By incorporating hydrophobic yarns, rather than being 100% hydrophilic, prevents the moisture from backflowing to the surface against the wearer's skin once it has wicked to the back face.
In the core moisture absorbing layer, terry looped pile has been used, which acts like a sponge. The terry looped pile is created using a sinker terry knitting machine which is capable of varying the loop height and creating a high density pile. A fabric knit is created of sinker loops 50 with plush loops 52 protruding from at least one side. A person skilled in the art will appreciate how sinker terry loop pile is created as opposed to single construction knitting where loops are formed by miss stitches.
In one embodiment, the yarn used for the sinker loops 50 is 100% polyester, whilst the yarn used for the plush loops is 80% polyester and 20% nylon. The plush loop height may be in the range of 1.5 mm to 3.5 mm, but more preferably around 2.5 mm.
To make the synthetic fibres of the plush loops more absorbent they are treated with a hydrolysing enzyme that splits the fibres into fibrils. Sodium hydroxide is used before dying the yarn to split the polyester and nylon fibres by at least partially dissolving and removing the nylon. In one example, the yarn is split from 90D/36F (36 fibres) into approx. 90D/300F (300 fibres or fibrils). The wording fibrils is being used to describe the individual threads into which a fibre can be split. Example images of fibre splitting are shown in
In one example embodiment, a single face terry looped pile was made using a 30 inch diameter, 16 gauge, sinker terry knitting machine manufactured by Tien Yang Knitting Machinery Co. and a combination of polyester and nylon blended yarns. The single face terry looped pile was subjected to a micro-fibre splitting treatment with an alkali solution of 12 grams sodium hydroxide per litre at 98 degrees Celsius for 45 minutes. The treatment at least partially dissolved and removed the nylon core of the blended yarn used in the knitting of the single face terry looped pile resulting in the formation of a plurality of fibrils 56. Next, the single face terry looped pile was dyed in a circular dying machine with a solution of: a disperse dye, Dianix Blue ACE manufactured by Dystar, at 0.003% on weight of fabric (o.w.f.), 0.5 grams per litre of a levelling agent, LM-0850 manufactured by Nicca Chemical Co., 0.25 grams per litre of acetic acid, and hydrophilic agent ASR, manufactured by Rudolf, at 2.5% o.w.f. The dyeing process was completed at 130° C. for 30 minutes.
In another example embodiment, a double face terry looped pile was made using a 30 inch diameter, 16 gauge, terry knitting machine manufactured by Tien Yang Knitting Machinery Co. and a combination of polyester and nylon blended yarns. The double face terry looped pile was subjected to a micro-fibre splitting treatment with an alkali solution of 12 grams sodium hydroxide per litre at 98 degrees Celsius for 45 minutes. The treatment at least partially dissolved and removed the nylon core of the blended yarn used in the knitting of the double face terry looped pile resulting in the formation of a plurality of fibrils 56. Next, the double face terry looped pile was dyed in a circular dying machine with a solution of: a disperse dye, Dianix Blue ACE manufactured by Dystar, at 0.003% o.w.f., 0.5 grams per litre of a levelling agent, LM-0850 manufactured by Nicca Chemical Co., 0.25 grams per litre of acetic acid, and hydrophilic agent ASR, manufactured by Rudolf, at 2.5% o.w.f. The dyeing process was completed at 130° C. for 30 minutes. The core layer 36 is relatively thin, flexible and can absorb five times its own weight. Absorption testing was carried out on a double face looped pile core layer and findings included a mean liquid absorbency time of 17.21 seconds and a mean porcine blood absorptive capacity of 29 ml. Also, the core layer was found to be quick drying, such that the garments will be user friendly in terms of washing and drying for reuse.
The moisture impermeable layer 38 is shown in
The PU sheet 60 is stretchable and has high breathability. The benefit of laminating the PU sheet to a base knit is that it makes the layer less “plasticky” in feel, movement and noise. It also creates a strong base to make the PU sheet more durable allowing for repeated washing minimising degradation or ripping of the PU sheet.
Hydrostatic pressure testing was performed on sample moisture impermeable layers to determine the resistance to fluid penetration. The samples were subjected to a mean kPa of 250 and no droplets passed through the samples, with the sample bursting when the pressure exceeded 250 KPa. The moisture impermeable layer 38 therefore successfully prevents leakage of fluid to the body fabric 32.
The knitting pattern of the body fabric 32 is illustrated in
The present invention relates to individual novel gusset layers that can be used in different combinations to create gussets for use in protective garments. The combined benefits of the gusset layers results in a gusset that is relatively thinner, has high wicking and absorbency, superior leak resistance and a comfortable natural fibre surface that sits against the wearer's skin.
It will be understood that the invention disclosed and defined in this specification extends to all alternative combinations of two or more of the individual features mentioned or evident from the text or drawings. All of these different combinations constitute various alternative aspects of the invention.
Number | Date | Country | Kind |
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2020900547 | Feb 2020 | AU | national |
Filing Document | Filing Date | Country | Kind |
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PCT/AU2021/050164 | 2/26/2021 | WO |