FR2875384A1 - Manufacturing process for high-performance plastic protective gloves consists of dipping moulds with linings into adhesive and polymer solutions - Google Patents

Abstract

The manufacturing process consists of fitting a lining (2) made from cotton, synthetic, glass, mineral or metal filaments and/or fibres or a mixture of these onto a male mould made in the shape of the glove (1) as it is worn. The mould and lining are then dipped into an aqueous dispersion based on one or more polymers to create an anti-penetration and adhesion layer (3) over the lining, which is dried to form a preform for the glove. This is dipped repeatedly in polymer solutions in a solvent phase to form at least one outer layer (4) which is dried and reticulated before removal from the mould. Prior to dipping in the aqueous polymer dispersion the mould and lining can be dipped into a coagulant based on acids and salts, such as acetic, formic or hydrochloric acid and calcium or magnesium nitrates and/or chlorates.

Description

The invention relates to a method for producing a protective glove

  as well as a protective glove made by such a method.

  It is known to provide supported protective gloves comprising a liner and an outer coating having cut, tear and puncture resistance characteristics. Such gloves are soft and comfortable. The method of producing these gloves comprises the making of a liner, its arrangement on a mold and then its successive dipping in a coagulant and in an aqueous dispersion based on a polymer lo.

  For some applications, it is known to produce gloves with high performance and specific, for example solvent resistance, high electrical insulation or intended for military use. The method of producing such gloves comprises multiple dipping in butyl and / or viton solutions and drying and crosslinking steps. However, such gloves are uncomfortable and fragile especially with respect to tears and perforations because they are not supported by a lining.

  It is therefore desirable to provide gloves with high and specific performance, for example solvent resistance, which are otherwise flexible, comfortable and resistant to cuts, abrasions, tears and punctures.

  The invention aims to fulfill this objective by providing a method for making gloves of various types having high and specific performance as indicated above, while being supported and comfortable.

  To this end, the invention relates to a method of producing a protective glove comprising the following steps: a. producing a liner from yarns and / or synthetic fibers; b. disposing said liner on a male mold having the shape of the glove when worn; vs. dipping the liner in an aqueous dispersion based on one or more polymers so as to form an antipenetration and adhesion layer around the liner; d. drying the liner coated with the antipenetration and adhesion layer so as to form a blank of the protective glove; said method further comprising the steps of: e. multiple dipping of the glove blank in solvent-phase polymer solutions to form at least one outer layer; f. drying and cross-linking of the glove; boy Wut. undressing the glove of its mold so as to obtain a glove having characteristics of high resistance to solvents, cutting, abrasion, tearing and perforation.

  Such a method therefore combines the method of producing a current supported glove and that of producing a glove having high and specific performance. The choice of materials, such as coagulants, polymers in aqueous dispersions or solvent phase makes it possible to adapt the gloves produced to specific applications such as military use for example.

  According to a second aspect, the invention relates to a protective glove made according to the method described above, the glove comprising a liner coated with an antipenetration and adhesion layer and at least one outer layer, the glove having characteristics of high resistance to solvents, cutting, abrasion, tearing and puncture.

  Other objects and advantages of the invention will become apparent from the following description, made with reference to the accompanying drawing.

  Figure 1 is a schematic representation of a protective glove according to the invention, the glove being partially shown in section so as to show the various layers constituting it.

  FIG. 2 is a flowchart representing the various steps of producing a protective glove according to the invention.

  With reference to FIG. 1, a protective glove 1 is described comprising a lining 2 coated with an antipenetration and adhesion layer 3 and at least one outer layer 4.

  The liner 2 can be of any known type. This is, for example, a seamless liner or quilted based on a knit, a fabric or a nonwoven.

  The liner 2 is made from one or more yarns and / or synthetic fibers selected from cotton, polyamide, polyester, meta or para-aramids, polyurethanes, acrylic. Glass, mineral and / or metal fibers such as stainless steel can also be used. These son and / or synthetic fibers can be used alone or in combination.

  The yarns and / or synthetic fibers of the liner 2 may be continuous filaments, fiber yarns, core yarns, gimped yarns or combinations thereof.

  The material and type of yarn and / or synthetic fibers may be chosen to impart flexibility and cut, abrasion, tear and puncture resistance properties to the liner 2. They are also chosen for their resistance to wear and to provide some comfort to the glove.

  The antipenetration and adhesion layer 3 covers the entire lining 2 and gives the glove a certain seal. It is made from one or more polymers used pure or in mixture. This or these polymers are for example chosen from polyurethane, polyvinyl alcohol, nitrile rubber, polychloropropene, natural or polyvinyl chloride.

  The outer layer 4 confers high performance and specific to the glove 1. Depending on the chosen materials, one adapts these performances to the application envisaged for the glove. These performances are, for example, high resistance to solvents or high electrical insulation.

  The outer layer 4 is made of a polymer selected from butyl rubber, polychloropropene, fluoropolymers, silicone or natural rubber used pure or in admixture.

  Several external layers 4 can be envisaged. It is also possible to coat all the glove 1 or a part thereof only, such as for example the palm and the top of the fingers.

  The coating by the outer layer 4 may be smooth or rough. When rough, the coating improves the grip of oily, wet or slippery objects.

  It is conceivable to terminate the glove 1 with a wrist or cuff, for example made of cotton, leather or any other material. Simply sew the wrist or cuff on the glove 1.

  With reference to FIG. 2, the method of producing glove 1 described above is now described.

  The first step a. consists in producing the lining 2 by means of son and / or synthetic fibers as described above.

  During a step b. the liner 2 is fitted to a male mold having the shape of the glove 1 when worn. That is, the mold has the shape of a hand.

  The liner 2 disposed on the mold is then dipped in a coagulant. The coagulant is based on acids and salts in aqueous or organic solutions.

  The acid is, for example, selected from acetic, formic or hydrochloric acid or is a mixture of these acids. The salt is, for example, selected from nitrates, chlorides, calcium or magnesium salt or is a mixture of these salts. In one embodiment, the coagulant is heat-sensitive. The mold is then heated prior to soaking the liner in the coagulant.

  In a step c., The liner is soaked in one or more polymers as described above so as to form the antipenetration and adhesion layer 3. The polymer (s) are used in an aqueous dispersion. The polyvinyl chloride is, for its part, implemented from a plastisol or an organosol, in which case, step b 'dipping in a coagulant is unnecessary and is not performed.

  Step d. consists of drying the lining 2 coated by the layer 3. This gives a blank of a conventional supported glove.

  In order to produce the outer layer (s) 4, the glove blank undergoes multiple dipping in solvent phase polymer solutions during a step e. The polymers used are as described above. Since these polymers are used in the solvent phase, only polymers exhibiting either high permeation resistances or particular characteristics, such as high electrical insulation, are employed during step e.

  During step f., Drying and crosslinking operations take place in order to finalize the glove 1.

  The glove 1 is then removed from the mold during a step g.

  We now describe a particular example of glove 1 made according to a method described above.

  The glove 1 comprises a knitted polyester lining 2, a polyurethane adhesion and antipenetration layer 3 and an outer layer 4 of butyl rubber. i0

  The performance of this glove 1 is as follows, measured against the European standards EN388 concerning the gloves against mechanical risks and EN374 concerning the resistance to the penetration of protective gloves against chemicals and / or microorganisms. organizations.

  According to EN388: abrasion resistance: level 1 resistance to slicing cut: level 1; tear resistance: level 1; resistance to perforation: level 1.

  According to EN374: resistance to permeation of acetonitrile: level 6 (which corresponds to a resistance of more than 480 minutes); resistance to acetone permeation: level 5 (between 240 and 480 minutes); resistance to 50% sodium hydroxide permeation: level 6 (over 480 minutes).

  The glove thus has high characteristics of solvent resistance while being not very fragile and comfortable.

Claims (12)

  A method of producing a protective glove (1) comprising the following steps: a. producing a liner (2) from yarns and / or synthetic fibers; b. disposing said liner on a male mold having the shape of the glove when worn; vs. dipping the liner (2) in an aqueous dispersion based on one or more polymers so as to form an antipenetration and adhesion layer (3) around the liner (2); d. drying the liner (2) coated by the antipenetration and adhesion layer (3) so as to form a blank of the protective glove; said method being characterized in that it further comprises the following steps: e. multiple dipping of the glove blank in solvent-phase polymer solutions to form at least one outer layer (4); f. drying and cross-linking of the glove; boy Wut. undressing the glove from its mold so as to obtain a glove (1) having characteristics of high resistance to solvents, cutting, abrasion, tearing and perforation.   2. Method according to claim 1, characterized in that it further comprises a step b 'of dipping the liner (2) in a coagulant 25 prior to step c ..   3. Method according to claim 1 or 2, characterized in that the liner (2) is made from one or more son and / or synthetic fibers among cotton, polyamide, polyester, meta or para-aramids, polyurethanes , acrylic, glass, mineral fibers, metal used alone or in mixtures.   4. Method according to any one of claims 1 to 3, characterized in that the son and / or synthetic fibers of the liner (2) are continuous filaments, fiber yarns, core threads, gimped son or combinations thereof.   5. Method according to any one of claims 2 to 4, characterized in that the coagulant used in step b '. is based on acids and salts in aqueous or organic solutions.   6. Process according to Claim 5, characterized in that the acid is chosen from acetic, formic or hydrochloric acid or is a mixture of these acids.   7. Process according to claim 5 or 6, characterized in that the salt is chosen from nitrates, chlorides, calcium or magnesium salt or is a mixture of these salts.   8. Method according to any one of claims 2 to 7, characterized in that the coagulant used in step b '. is a heat-sensitive coagulant, the mold being heated prior to soaking the liner (2) in the coagulant.   9. Process according to any one of claims 1 to 8, characterized in that the polymer (s) of step c. are chosen from polyurethane, polyvinyl alcohol, nitrile rubber, polychloropropene, natural or polyvinyl chloride, the polymers being used pure or in admixture.   10. Process according to any one of claims 1 to 9, characterized in that the polymers used during step e. are chosen from butyl rubbers, polychloropropene, fluoropolymers, silicone or natural rubber used alone or as a mixture in the solvent phase.   Protective glove made according to the method according to any one of claims 1 to 10, characterized in that it comprises a liner (2) coated with an antipenetration and adhesion layer (3) and at least one an outer layer (4), the glove (1) having characteristics of high resistance to solvents, cutting, abrasion, tearing and puncturing.   Protective glove according to claim 11, characterized in that the lining (2) is a seamless or stitch-lined lining of a knit, fabric or nonwoven. io