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Title:
A THERMOPLASTIC FORMER HOLDER FOR USE IN LATEX DIPPING PROCESS
Document Type and Number:
WIPO Patent Application WO/2020/218915
Kind Code:
A1
Abstract:
The present invention relates to a thermoplastic former holder with a quick-release mechanism for use in latex glove dipping process. More particularly, the present invention relates to a method of attaching the former and the holder with enhancing efficiency and performance of latex glove dipping process. One of the advantages of the present invention is that the thermoplastic former holder is light weight with reduction of energy cost and production cost. Furthermore, the thermoplastic former holder of the present invention is recyclable where any waste or broken parts and parts of former can be recycled and reused in same application contributes to green environment and less carbon footprint.

Inventors:
TAN CHAIK LEE (MY)
Application Number:
PCT/MY2020/050025
Publication Date:
October 29, 2020
Filing Date:
April 24, 2020
Export Citation:
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Assignee:
TAN CHAIK LEE (MY)
International Classes:
B29C41/14; B29C33/30; B29C41/34
Domestic Patent References:
WO2017131508A12017-08-03
WO2019161422A12019-08-29
WO2017034386A22017-03-02
WO2017131508A12017-08-03
Foreign References:
CN202180559U2012-04-04
CN108407166A2018-08-17
US20020076503A12002-06-20
GB2240133A1991-07-24
MY2017050004W2017-01-24
CN206978856U2018-02-09
Attorney, Agent or Firm:
LEONG, Jin Hoong (MY)
Download PDF:
Claims:
CLAIMS

1. A thermoplastic former holder for use in latex dipping process comprising an interchangeable roller adaptor having a first side and a second side facing opposite one another with an extended wall in a perpendicular planar and about a circumference of the interchangeable roller adaptor in between the first side and the second side, such that the extended wall to engage a track for movement of the former holder; a former attached to the first side of the interchangeable roller adaptor; a holder having a holder arm engaged with the second side of the interchangeable roller adaptor at one end and a shaft connected to an arm structure at another end; wherein a quick-release locking mechanism is provided between the former to the interchangeable roller adaptor for attaching and detaching the former from the interchangeable roller adaptor.

2. The thermoplastic former holder as claimed in Claim 1 wherein the quick-release locking mechanism is a rotary slide locking mechanism having a male connector having a knob provided to the end cuff of the former connected to a female receptor provided to the first side of an interchangeable roller adaptor such that the knob at the end cuff of the former the slides through an elongated slot and retains the former in a fixed position into the interchangeable roller adaptor.

3. The thermoplastic former holder as claimed in Claim 1 wherein the quick-release locking mechanism is a rotary slide locking mechanism preferably a male connector having a knob provided to the end cuff of the former connected to a female receptor provided to the first side of an interchangeable roller adaptor such that the knob at the end cuff of the former the slides through an elongated slot with assistance from a rotary slide ring and retains the former in a fixed position into the interchangeable roller adaptor.

4. The thermoplastic former holder as claimed in Claim 1 wherein the quick-release locking mechanism is a rotary thread locking mechanism having a male thread provided to the end cuff of the former connected to a female thread provided to the first side of an interchangeable roller adaptor.

5. The thermoplastic former holder as claimed in Claim 1 wherein the quick-release locking mechanism is a snap-fitted locking mechanism having a male receptor provided to the end cuff of the former connected to a female connector having a protrusion provided to the first side of an interchangeable roller adaptor such that the protrusion is snap-fitted to the male receptor and retains the former in a fixed position into the interchangeable roller adaptor.

6. The thermoplastic former holder as claimed in Claim 1 wherein a bushing (902) and a first stopper (904) are provided between the the interchangeable roller adaptor and the holder for allowing the interchangeable roller adaptor capable of independent movement relative to the former.

7. The thermoplastic former holder as claimed in Claim 1 wherein a second stopper is provided between the holder arm and the interchangeable roller adaptor to retain the interchangeable roller adaptor in a fixed position.

8. The thermoplastic former holder as claimed in Claim 1 wherein the shaft connected to an arm structure at another end to hold the former holder and to allow the movement of the former holder up and down during latex dipping process.

9. The thermoplastic former holder as claimed in Claim 1 wherein a ring is provided in a fixed position between the former and the interchangeable roller adaptor as an indicator to distinguish types of latex materials and sizes of latex articles during production.

10. A method of attaching a thermoplastic former to a thermoplastic holder for use in latex dipping process comprising a) engaging a second side of the interchangeable roller adaptor at a holder arm of a holder; b) pushing an end cuff portion of the former to a first side of an interchangeable roller adaptor for attaching the former to the interchangeable roller adaptor via a locking mechanism; and c) connecting a shaft of the holder at another end to an arm structure to hold the former holder and to allow the movement of the former holder up and down during latex dipping process.

1 1 . The method as claimed in Claim 10 wherein the locking mechanism is a quick-release locking mechanism.

12. The method as claimed in Claim 10 wherein the interchangeable roller adaptor is engaged at a holder arm of a holder via a bushing and a first stopper.

13. The method as claimed in Claim 10 wherein the step (b) further comprising allowing the interchangeable roller adaptor capable of independent movement relative to the former.

14. The method as claimed in Claim 10 wherein step (c) further comprising

retaining the interchangeable roller adaptor in a fixed position via a second stopper is provided between the holder arm and the interchangeable roller adaptor.

15. A method of detaching a thermoplastic former to a thermoplastic holder for use in latex dipping process comprising a) releasing an end cuff portion of the former from a first side of an interchangeable roller adaptor connected to a holder via a quick-release locking mechanism.

16. A thermoplastic former holder for use in latex dipping process comprising an interchangeable adaptor having a first side and a second side facing opposite one another with an extended wall in a perpendicular planar and about a circumference of the interchangeable adaptor at the second side, such that a former is attached to the first side of the interchangeable adaptor; a holder having a holder arm engaged with the second side of the interchangeable adaptor at one end; wherein a quick-release locking mechanism is provided between the former to the interchangeable adaptor for attaching and detaching the former from the interchangeable adaptor.

17. The thermoplastic former holder as claimed in Claim 16 wherein the quick-release locking mechanism is a rotary slide locking mechanism preferably a male connector having a knob provided to the end cuff of the former connected to a female receptor provided to the first side of an interchangeable adaptor such that the knob at the end cuff of the former the slides through an elongated slot with assistance from a rotary slide ring and retains the former in a fixed position into the interchangeable adaptor.

Description:
A THERMOPLASTIC FORMER HOLDER FOR USE IN LATEX DIPPING PROCESS

FIELD OF THE INVENTION

The present invention relates to a thermoplastic former holder with a quick-release mechanism for use in latex glove dipping process. More particularly, the present invention relates to a method of attaching the former and the holder with enhancing efficiency and performance of latex glove dipping process.

BACKGROUND OF THE INVENTION

A former holder assembly for use in latex glove dipping process such as in glove manufacturing industry generally includes a ceramic former attached and detached to a steel holder with a locking mechanism. The former is typically carried by conveyor chain through the former holder for latex glove dipping process. However, the existing former holder assembly suffers from several disadvantages, as the process of installation or replacement of the ceramic former (due to the weight and nature of ceramic which is fragile) can be extremely cumbersome and time consuming during the glove manufacturing process. The replacement of the former from the holder requires substantial precise engagement to enable smooth locking and unlocking of the former during operation.

PCT application, PCT/MY2017/050004 (published as W02017131508 - KOSSAN SDN. BHD.) disclosed a former holder locking mechanism for use in latex dipping industry as illustrated in Figure 1 . Accordingly, the former holder locking mechanism includes: a) a shaft collaboratively in communication with holder; b) a cam unit having an active cam and a passive cam to perform locking and unlocking operations; c) active and passive biasing elements collaboratively work with the active and passive cams to securely urge a former into tight engagement with the cavity of the holder; d) retaining plate configured in adjacent with locking protrusion of the active cam; wherein each active cam and the passive cam is provided with predefined cam pathway, such that they are able to collaboratively reciprocate in accordance with the locking and unlocking positions. However, such locking mechanism is too relying on the active and passive cams to securely urge a former into tight engagement with the cavity of the holder which does not provide sufficient force to retain the former and could be easily disengaged during operations. In some occasions, this may lead to ceramic former being damaged which may unintentional lead to an injury or harm to the operators. In addition, the discarded ceramic former cannot be recycled and reformed into new molds. The ceramic former for dipping is a non-renewable resource as it generally contains natural components such as special clay, feldspar and alumina.

Another prior art as shown in Figure 2, CN206978856U by JIANGXI HENGSHENG IND CO

LTD disclosed a hand mold fixing structure for latex glove production, comprising a hand mold body and a fixing base for fixing the hand mold body; the fixing base includes a mounting plate fixed to the outer member, and the mounting plate is provided with a set a tube, the lower end of the sleeve is closed, the upper end is open, and a spring is fixed in the sleeve. Preferably, a locking ring is sleeved on the plunger, and the locking ring is screwed to the plunger. The fixed structure of the design has novel and compact structure design and can be quickly disassembled and installed in the implementation, and can be applied to the processes of sizing, drying and vulcanizing of latex gloves. However, such implementation relying on the spring is fixed in the sleeve to retain the former in the fixed position. There is a need to replace the spring when in malfunction. Furthermore, orientation and design of the holder in this prior art does not allow the flexible movement of the former for latex dipping process when in operation.

In view of the above shortcomings, the present invention aims to provide a new design for a practical and effective former holder system based on thermoplastic materials for rapid, easy and safe replacement of the former. Thermoplastics are increasingly important as materials useful in the manufacture of a wide variety of items. It has long been acknowledged that the recycling of thermoplastics is highly desirable to decrease the waste stream and conserve precious natural resources. Accordingly, the present invention aims to provide an improved former holder locking mechanism for use in latex dipping industry, one which in more simple and effective approaches, and yet robust and durable in use. The present invention also facilitates ready and easy attaching and detaching the former, while at a same time provides safe and effective locking and unlocking operations. SUMMARY OF THE INVENTION

The present invention provides a thermoplastic former holder for use in latex dipping process comprising an interchangeable roller adaptor having a first side and a second side facing opposite one another with an extended wall in a perpendicular planar and about a circumference of the interchangeable roller adaptor in between the first side and the second side, such that the extended wall to engage a track for movement of the former holder; a former attached to the first side of the interchangeable roller adaptor; a holder having a holder arm engaged with the second side of the interchangeable roller adaptor at one end and a shaft connected to an arm structure at another end; wherein a quick-release locking mechanism is provided between the former to the interchangeable roller adaptor for attaching and detaching the former from the interchangeable roller adaptor.

A method of attaching a thermoplastic former to a thermoplastic holder for use in latex dipping process comprising

a) engaging a second side of the interchangeable roller adaptor at a holder arm of a holder; b) pushing an end cuff portion of the former to a first side of an interchangeable roller adaptor for attaching the former to the interchangeable roller adaptor via a locking mechanism; and c) connecting a shaft of the holder at another end to an arm structure to hold the former holder and to allow the movement of the former holder up and down during latex dipping process.

A method of detaching a thermoplastic former to a thermoplastic holder for use in latex dipping process comprising

a) releasing an end cuff portion of the former from a first side of an interchangeable roller adaptor connected to a holder via a quick-release locking mechanism.

One of the advantages of a former holder with a quick-release mechanism for use in latex glove dipping process of the present invention, it can be easily removed and replaced the former from the holder without disruption of the glove manufacturing operation. Furthermore, the attachment between the former and holder with this invention is a centralized position which reduces dislodged problem due to vibrate, misalignment of the former when passing the stripping machine and to avoid uneven dipping process in latex dipping tank and coagulant dipping tank. In addition, the holder with the quick-release mechanism can be easily fitted to an automatic former replacement machine to reduce manpower and safety during replacement.

Further advantages of the system in accordance with the invention and its application can be derived from the description and the accompanying drawings. The above-mentioned features and those to be further described below can be utilized in accordance with the invention individually or collectively in arbitrary combination. The embodiments mentioned are not to be considered exhaustive enumerations, rather have exemplary character. The invention is shown in the drawings and explained more closely with reference to embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

Figure 1 illustrates a prior art of the former holder.

Figure 2 illustrates another prior art of the former holder.

Figure 3 illustrates an overall design of the former holder assembly of thermoplastic former holder for use in latex dipping process in accordance of the present invention.

Figure 4 illustrates a quick-release locking mechanism of a rotary thread locking mechanism in accordance of a first embodiment of thermoplastic former holder for use in latex dipping process in accordance of the present invention.

Figure 5 illustrates a quick-release locking mechanism of a rotary slide locking mechanism in accordance of a second embodiment of thermoplastic former holder for use in latex dipping process in accordance of the present invention.

Figure 6 illustrates a quick-release locking mechanism of a rotary slide locking mechanism in accordance of a third embodiment of thermoplastic former holder for use in latex dipping process in accordance of the present invention. Figure 7 illustrates a quick-release locking mechanism of a snap-fitted locking mechanism in accordance of a fourth embodiment of thermoplastic former holder for use in latex dipping process in accordance of the present invention.

Figure 8 illustrates a holder in accordance of thermoplastic former holder for use in latex dipping process in accordance of the present invention.

Figure 9 illustrates an exploded view and an assembled view of thermoplastic former holder for use in latex dipping process in accordance of the present invention.

Figure 10 illustrates an exploded view and an assembled view of another embodiment of the thermoplastic former holder for use in latex dipping process in accordance of the present invention.

DETAILED DESCRIPTIONS OF THE INVENTION

The present invention will now be described in detail in connection with specific embodiments with reference to the accompanying drawings. Unless the context requires otherwise, throughout the specification and claims which follow, the word “comprise” and variations thereof, such as,“comprises” and“comprising” are to be construed in an open, inclusive sense that is as “including, but not limited to”. Reference throughout this specification to “one embodiment” or“an embodiment” means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrases“in one embodiment” or“in an embodiment” in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. With respect to the use of substantially any plural and/or singular terms herein, those having skill in the art can translate from the plural to the singular and/or from the singular to the plural as is appropriate to the context and/or application. The various singular/plural permutations may be expressly set forth herein for sake of clarity. It will be further understood by those within the art that virtually any disjunctive word and/or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase "A or B" will be understood to include the possibilities of "A" or "B" or "A and B."

Various aspects of the systems and devices disclosed herein may be illustrated by describing components that are connected, coupled, attached, bonded and/or joined together. As used herein, the terms "connected", "coupled", "attached", "bonded" and/or "joined" are used interchangeably to indicate either a direct connection between two components or, where appropriate, an indirect connection to one another through intervening or intermediate components. Additionally, unless otherwise specified, these terms are used interchangeably to indicate a connection in which one or more degrees of freedom are not rigidly constrained between two components (e.g., a pivoting connection, a translating connection, a pivoting and translating connection, an elastic connection, a flexible connection, etc.), or a rigid or substantially rigid connection in which all degrees of freedom are constrained or substantially constrained between the two components.

The terms“left,”“right,”“top,”“bottom,”“front, ”“rear,”“side,”“height,”“length,”“width, ”“upper,” “lower,” “interior,” “exterior,” “inner,” “outer” and the like as may be used herein, merely describe points or portions of reference and do not limit the present invention to any particular orientation or configuration. Further, terms such as“first,”“second,”“third,” etc., merely identify one of a number of portions, components and/or points of reference as disclosed herein, and do not limit the present invention to any particular configuration or orientation.

The present invention relates to thermoplastic former holder for use in latex dipping process hereinafter, this specification will describe the present invention according to the preferred exemplary or embodiments of the present invention. Flowever, it is to be understood that limiting the description to the preferred exemplary or embodiments of the invention is merely to facilitate discussion of the present invention and it is envisioned that those skilled in the art may devise various modifications and equivalents without departing from the scope of the appended claims. The present invention aims to provide a practical and effective former holder system for rapid, easy and safe replacement of the former. The former holder locking mechanism for use in latex dipping process according to the preferred exemplary of the present invention will now be described in accordance to the accompanying drawings.

Figure 3 illustrates an overall design of the former holder assembly of thermoplastic former holder (300) for use in latex dipping process in accordance of the present invention. A thermoplastic former holder (300) for use in latex dipping process having an interchangeable roller adaptor (302) having a first side (304) and a second side (306) facing opposite one another with an extended wall (308) in a perpendicular planar and about a circumference of the interchangeable roller adaptor in between the first side (304) and the second side (306), such that the extended wall (308) to engage a track for movement of the former holder (300). A former (310) is attached to the first side (304) of the interchangeable roller adaptor (302). Next, a holder (312) having a holder arm (314) engaged with the second side (306) of the interchangeable roller adaptor (302) at one end and a shaft (316) connected to an arm structure at another end. A rotary slide ring (317) is provided a locking position of the former onto adapter, and to identify and distinguish size and type of former. Meanwhile, a quick- release locking mechanism (318) is provided between the former to the interchangeable roller adaptor (302) for attaching and detaching the former (310) from the interchangeable roller adaptor (302). General property of thermoplastic used in the present invention is selected from polymers withstand latex dipping process, excellent in thermal stability and shock resistance properties for consistent with prolonged usage in latex dipping process. Such polymers are selected from PPA, PA4T, PA46, PA9T, PPS , PARA and PEEK exhibit with strong resistance to acid and alkalis attacks, maintain the surface and material integrity under varied dynamic and chemical interactions during the latex dipping process. High strength materials with low thermal expansion properties is used in the present invention to accommodate the forming, shaping and treating of the formers of varied shapes, dimensions, surface conditions, texturing and coatings.

Figure 4 illustrates a quick-release locking mechanism of a rotary thread locking mechanism in accordance of a first embodiment of thermoplastic former holder for use in latex dipping process in accordance of the present invention. It is preferably that an end cuff portion (402) of the former is attached to a first side (404) of an interchangeable roller adaptor (406). Depending on the requirements, the rotary thread locking mechanism can be a rotary fine threaded or a rotary coarse threaded. Such locking mechanism is based in a male thread provided to the end cuff of the former connected to a female thread provided to the first side (404) of an interchangeable roller adaptor (406). In another embodiment, the locking mechanism of the present invention is a rotary slide locking mechanism as illustrated in Figure 5. The rotary slide locking mechanism preferably a male connector (502) having a knob (504) provided to the end cuff of the former connected to a female receptor (506) provided to the first side of an interchangeable roller adaptor (508) such that the knob (504) at the end cuff of the former the slides through an elongated slot (510) and retains the former in a fixed position into the interchangeable roller adaptor (508).

Figure 6 illustrates a quick-release locking mechanism of a rotary slide locking mechanism in accordance of a third embodiment of thermoplastic former holder for use in latex dipping process in accordance of the present invention. In alternative embodiment, the rotary slide locking mechanism preferably a male connector (602) having a knob (604) provided to the end cuff of the former connected to a female receptor (606) provided to the first side of an interchangeable roller adaptor (608) such that the knob (604) at the end cuff of the former the slides through an elongated slot (610) with assistance from a rotary slide ring (612) and retains the former in a fixed position into the interchangeable roller adaptor (608). The rotary slide ring (612) is provided a locking position of the former onto adapter, and to identify and distinguish size and type of former. Figure 7 illustrates a quick-release locking mechanism of a snap- fitted locking mechanism in accordance of a fourth embodiment of thermoplastic former holder for use in latex dipping process in accordance of the present invention. The snap-fitted locking mechanism preferably a male receptor (708) provided to the end cuff of the former connected to a female connector (710) having a protrusion (712) provided to the first side of an interchangeable roller adaptor (714) such that the protrusion (712) is snap-fitted to the male receptor (708) and retains the former in a fixed position into the interchangeable roller adaptor (714).

Figure 8 illustrates a holder in accordance of thermoplastic former holder for use in latex dipping process in accordance of the present invention. A holder (802) having a holder arm (804) engaged with the second side of the interchangeable roller adaptor at one end and a shaft (806) connected to an arm structure at another end. Meanwhile, the shaft (806) connected to an arm structure at another end to hold the former holder and to allow the movement of the former holder up and down during latex dipping process.

Figure 9 illustrates an exploded view and an assembled view of thermoplastic former holder for use in latex dipping process in accordance of the present invention. To enhance the movement of the former, a bushing (902) and a first stopper (904) are provided between the interchangeable roller adaptor and the holder for allowing the interchangeable roller adaptor capable of independent movement relative to the former. The independent movement of the interchangeable roller adaptor is provided to roll on a conveyor track during latex dipping process. Another function of the first stopper (904) is used as a lock to prevent the bushing (902) from falling off from the connection between the interchangeable roller adaptor and the holder. In addition, a second stopper (906) is provided between the holder arm and the interchangeable roller adaptor to retain the interchangeable roller adaptor in a fixed position. A bushing (908) is also provided at the shaft connected to an arm structure at another end to hold the former holder to support rolling movement against a conveyer during operation. In another embodiment (not shown in Figure 9), a ring is provided in a fixed position between the former and the interchangeable roller adaptor as an indicator to distinguish types of latex materials and sizes of latex articles during production. One of the advantages of the present invention is that the thermoplastic former holder is light weight with reduction of energy cost and production cost. Furthermore, the thermoplastic former holder of the present invention is recyclable where any waste or broken parts and parts of former can be recycled and reused in same application contributes to green environment and less carbon footprint.

In operation, a method of attaching a thermoplastic former to a thermoplastic holder for use in latex dipping process begins with the interchangeable roller adaptor is engaged at a holder arm of a holder as shown in Figure 9. via a bushing and a first stopper... Next, pushing an end cuff portion of the former to a first side of an interchangeable roller adaptor for attaching the former to the interchangeable roller adaptor via a locking mechanism preferably the quick- release mechanism as described in Figures 4,5,6 and 7. During this step, the interchangeable roller adaptor is capable of independent movement relative to the former via a bushing. . Then, a shaft of the holder at another end is connected to an arm structure to hold the former holder and to allow the movement of the former holder up and down during latex dipping process. Finally, the interchangeable roller adaptor is retained in a fixed position via a stopper provided between the holder arm and the interchangeable roller adaptor. Meanwhile, for detaching a thermoplastic former to a thermoplastic holder, an end cuff portion of the former is released from a first side of an interchangeable roller adaptor connected to a holder via a quick-release locking mechanism.

Figure 10 illustrates an exploded view and an assembled view of another embodiment of the thermoplastic former holder for use in latex dipping process in accordance of the present invention. Alternatively, a thermoplastic former holder for use in latex dipping process comprising an interchangeable adaptor (1 100) having a first side (1 102) and a second side (1 104) facing opposite one another with an extended wall (1 106) in a perpendicular planar and about a circumference of the interchangeable adaptor (1 100) at the second side (1 104), such that a former (1 108) is attached to the first side (1 102) of the interchangeable adaptor (1 100); a holder having a holder arm (not shown in drawing) engaged with the second side (1 104) of the interchangeable adaptor (1 100) at one end; wherein a quick-release locking mechanism is provided between the former (1 108) to the interchangeable adaptor (1 100) for attaching and detaching the former (1 108) from the interchangeable adaptor (1 100).

The quick-release locking mechanism in this alternative embodiment preferably is a rotary slide locking mechanism preferably a male connector having a knob (1 1 10) provided to the end cuff of the former connected to a female receptor provided to the first side of the interchangeable adaptor such that the knob (1 1 10) at the end cuff of the former the slides through an elongated slot (1 1 12) with assistance from a rotary slide ring and retains the former in a fixed position into the interchangeable adaptor. Meanwhile, the holder is preferably any existing metal holder or thermoplastic holder having a holder arm with a male connector engaged with a female receptor of the second side of the interchangeable adaptor at one end via a locking mechanism. The male connector is preferably an extended retention plate securely attached to the female receptor preferably a cavity (1 1 14) having the same size of the retention plate.

The thermoplastic former holder for use in latex dipping process in accordance of the present invention overcome the problems and difficulties of the prior art for process of dipping a rubber article such as continuous dipping line, batch dipping line, single former dipping line, double former dipping line to produce final rubber article such as examination glove, polymer glove, surgical glove, condom, balloon, finger cot. Moreover, thermoplastic former holder of the present invention is a universal single module easy exchangeable to accommodate multiple sizes of glove production suchas size S, M, L, XL, XXL and other equivalent sizes.

The foregoing detailed description and examples are merely illustrative of the preferred embodiments. They are by no means meant to be the exclusive description of the inventive concept hereby disclosed. It will be recognized by one of ordinary skill in the art that certain aspects of the practice of the invention are readily susceptible to modification or practice by alternative, known means.