RU2158200C1 - Method and device for manufacture of dipped rubber goods - Google Patents

Abstract

FIELD: manufacture of dipped rubber goods, for example gloves, by the method of ion deposition. SUBSTANCE: moulds for dipped rubber goods are installed on a continuously moving conveyer. Moulds emptied of goods are fed to washing and mechanical cleaning. Then coagulant is applied to the moulds in a both. The moulds are dried and dipped in baths with latex mixes and dried off. Prior to washing, the moulds are treated by an alkaline solution. At mechanical cleaning the moulds are simultaneously rinsed. Then the moulds are cleaned by a solution of acid and dipped in a bath with a hot weak alkaline solution. At application of coagulant the moulds are successively dipped in the first coagulant containing salts of the acid of the cleansing solution. Then they are dipped in the second coagulant of high concentration and necessary viscosity. The device has a chain conveyer closed in the vertical plane, with mould wheels hinge-joined to it. The baths for the cleansing solution of acid, for the hot weak alkaline solution, for coagulant containing salts of the cleansing solution and for coagulant of high concentration and necessary viscosity are installed in succession. The baths with latex mixes are installed at a distance from each other providing for the minimum time interval between the going-out of the moulds from the first bath and their dipping in the second bath. The conveyer between the baths with latex mixes is furnished with a device for provision of the necessary angle of going-out of moulds from the first bath and their entering in the second bath at the instant of elevation of moulds from the first bath to the maximum height. EFFECT: enhanced quality of dichromatic goods. 3 cl, 3 dwg

Description

 The invention relates to the production of latex products by ion deposition and can be used for the manufacture of surgical, anatomical, diagnostic, household and other gloves.

 A known method and device for manufacturing products by the formation of coatings by immersion according to patent N 1097458, Great Britain.

 The device consists of a conveying element, consisting of two endless chain conveyors arranged horizontally, with drive elements longitudinally continuously moving on them, installed at a certain interval. The drive elements carry designs for the cores, supports for each core. Each support can move vertically with respect to the supporting structure. Along the outside of the conveyor are various positions of the process. At one position, the cores are heated to the appropriate temperature by immersion in a tank of heated water. At the next position, the tempered cores are gradually lowered and removed from the bath or tank containing the vinyl resin solution to form the outer layer of the glove. In this case, the cores additionally rotate. In the third position, coated cores extend above the table / pallet /, in addition, they are turned over and rotated to drain excess coating material from the cores.

 Then the cores enter the furnace, heated to a temperature sufficient for vulcanization and melting of the vinyl resin.

 In a subsequent position, the cured cores are cooled when immersed in a tank of water or a fan.

 On the return stroke of the conveyor, the cores are again gradually immersed in the second bath forming the coating and removed from it at the next position, where they pass over the drip tray to drain excess coating material. Then the cores enter the second furnace, the temperature in which is set necessary for vulcanization.

 In the next position, the cured core is cooled by immersion in a tank of water, and then fed to the drying position.

 Next, the dried cores are fed to the removal position.

The disadvantages of the known device include:
- the relatively low effective use of technological equipment in connection with the transportation of one / two maximum / cores / molds / on the supporting element;
- the location of technological equipment at the same level, hence the low efficient use of production facilities of the installation.

 The closest in technical to the claimed is a method of manufacturing products, carried out on the device according to SU N 2128827 class. B 29 H 3/04 from 08/30/1938.

 The device contains a vertically closed conveyor, successively installed tanks with acid, alkali, two clean tanks, a tank with coagulant, a furnace for preliminary drying, a tank with latex for dipping, tanks with hot water and wet powder, a device for seaming the whisk, a section for vulcanization, devices for pre-dusting and removal of products, the main engine.

 The manufacturing process of products is as follows. Initially, the molds pass through acid containers where swelling / softening / deposits of dirt on the molds occur. Further, the forms fall into a container with a neutralizing solution with alkali and pass through preliminary and final rinsing in tanks with clean water. The forms purified in this way enter the container with the coagulant and pass through the drying chamber of the coagulant and then are dipped into the latex solution. The forms dipped into the latex solution enter the heated air syneresis chamber. Upon exit from the air syneresis chamber, the molds pass through the corolla seaming device, a water syneresis tank with heated water, dusting solution and enter the vulcanization chamber. After exiting the vulcanization chamber, the products are dry powdered and removed from the molds.

 The process is then repeated.

 Due to the fact that the forms after treatment with acid, neutralization with alkali and washing with clean water pass through the same tank with the coagulant, are dried and immediately enter the latex solution, the possibility of obtaining low-quality products increases, since there is a chance of uneven coating of the forms with the coagulant due to reduced wettability, and when dipping them in a latex mixture - non-layering of latex.

 In addition, it is impossible to obtain two-layer products on this line.

 The aim of the invention is to improve the quality of products.

 This goal is achieved by the fact that the forms mounted on a continuously moving conveyor, treated with an alkaline solution and subjected to mechanical cleaning with simultaneous rinsing, are cleaned with an acid solution, then immersed in a bath with a hot weak alkaline solution to neutralize and subsequently immersed in the first coagulant containing acid salts a cleaning solution, a second coagulant of increased concentration and the necessary viscosity and a bath with latex mixtures.

 Dipping forms into the first coagulant containing acid salts of the cleaning solution provides preliminary wettability of the surface of the forms. Immersion in a second coagulant solution of increased concentration and the required viscosity creates a uniform coating of the forms with the coagulant, which, when they are subsequently immersed in the latex mixture, eliminates non-layering of the latex film, the appearance of bubbles, holes and, therefore, leads to an increase in the quality of the products.

 In order to obtain two-layer products, both monochromatic and layers, different in color and purpose, the forms treated with coagulants are successively immersed in the first and second baths with latex mixtures with a time interval necessary and sufficient for draining the excess drops of the latex mixture from the forms and drying out the film obtained in the first bath, and the exclusion of delamination of the film obtained in the second bath.

 To implement this method, in a device containing a continuously moving chain conveyor, closed in a vertical plane, with pivotally mounted mold holders, cleaning and drying agents, baths with a cleaning acid solution, with a weak weak alkaline solution, the first coagulant containing salts are installed in series acid cleaning solution, the second coagulant of high concentration and the necessary viscosity and bath with latex mixtures. Moreover, baths with latex mixtures are installed at a distance that provides a minimum period of time between the release of forms from the first bath and immersion in the second. The container in the area between the baths with latex mixtures is made with a device that provides the desired angle of exit of the molds from the first bath and their entry into the second at the time of reaching the maximum height of the molds from the first bath.

 In FIG. 1 is a diagram of a production line for dipped products; FIG. 2 - line element, in FIG. 3 is a sectional view of an element along AA.

 The manufacture of rubber products / gloves / is carried out using a device that is a production line that contains a chain conveyor closed in a vertical plane 1, with pivotally mounted on it mold holders 2 mounted with the possibility of rotation around its axis, a bath with an alkaline solution 3, shape articles 4, a device for cleaning and simultaneously rinsing forms 5, a bath 6 with a cleaning acid solution, a bath 7 with a hot weak alkaline solution to neutralize, a bath 8 with the first coagulant, s containing acid salts of the cleaning solution for wetting the molds, a bath 9 with a second coagulant of increased concentration and the required viscosity, a chamber 10 for drying the coagulant, a bath 11 and a bath 12 with latex mixtures, an inflection element of the conveyor 13, a heat chamber 14, a corolla rolling mechanism 15, a bath water syneresis 16, a pre-heating mold and pre-vulcanization bath 17, a drying and vulcanization chamber 18, a steaming bath 19 and a product removal device 20.

 The manufacturing process of products is as follows.

The molds 4, mounted on the mold holders 2 mounted on a continuously moving chain conveyor 1, are freed from the products in the pick-up device 20 automatically by the jet of the solution flowing from the nozzles under pressure. The freed forms 4 enter the bath 3 for cleaning with an alkaline 1.2 - 1.5% solution of sodium hydroxide NaOH, which softens the residues of plaque on the forms of dusting solution, koalin, etc. The length of the bath 3 is chosen so that the residence time of the forms in it at continuous movement of the conveyor was sufficient to soften the plaque. Then the molds 4 are mechanically brushed while rinsing in the device 5 and enters the bath 6, where the final cleaning of the molds takes place with a 0.6 - 0.75% solution of nitric acid HNO ₃ . After this, the forms pass through a bath 7 with sodium hydroxide added to it to pH 9-11.

 Such preparation of forms for dipping into a coagulant contributes to the stable production of a high-quality film of the product.

The cleaned and heated molds 4 enter the bath with the first coagulant 8, containing a 10 - 13% solution of calcium nitrate Ca (NO ₃ ) ₂ , which serves to pre-wet the molds.

 The presence in the bath 8 of a solution similar in content to the solution in the bath 6 provides a better wettability of the forms by the coagulating solution, and, consequently, a more uniform application of the coagulant in the bath 9.

 Dipping forms 4 is carried out due to their articulation by moving from horizontal to vertical position. Bath 8 contains a homogeneous non-sagging solution and does not require a mixing device.

Dipping into a second bath with a solution of coagulant 9 is carried out due to the conveyor 1 curved in the vertical plane, which allows you to get rid of excess coagulant on forms 4 when they exit the bath. Bath 9 contains a 25 - 27% aqueous solution of Ca (NO ₃ ) ₂ and a 10% solution of koalin and is equipped with a mixing device. Baths 8 and 9 have shirts through which the solutions are heated to the desired temperature. After drying in the chamber 10, the molds are immersed in the first bath with the latex mixture 11 due to the conveyor 1 curved in the vertical plane. The molds exit the bath 11 in a straight line inclined to the horizontal at an angle necessary and sufficient to drain excess drops of the latex mixture from the molds / about 28 ^o /. The top of the maximum mold lift from the first bath with the latex mixture 11 is the beginning of the lowering for the molds to enter the second bath with the latex mixture 12. The kink element of the conveyor 13 may be an asterisk with a minimum number of teeth for a given chain pitch. Such a device and the distance between the baths with latex mixtures 11 and 12 provide a minimum period of time between the exit of the molds from the bath 11 before entering the second bath 12, which is a necessary condition to prevent excessive drying of the first layer of the latex mixture, since drying leads to increased compaction latex gel, which complicates the ionic deposition of the second layer and causes delamination or non-layering of the film of the second layer.

 The presence of the second bath 12 with a latex mixture is necessary in the manufacture of gloves with a large thickness / anatomical / or two-layer, having different layers / protective, substrate, color /. With double soaking, a possible defect during the first dipping / bubble, crack / overlaps in the second bath.

 Bathtubs with latex mixtures can be used simultaneously during work / production of two-layer gloves / or any of the two due to the bypass paths above them.

 Forms with latex gel undergo air syneresis in the heat chamber 14, after which the whisk rolls on the corolla seaming mechanism 15.

 For washing the latex gel from unreacted ingredients and calcium salts, as well as for further compaction of the gel, forms 4 enter the bath of water syneresis 16 with pure thermal water, then into the bath 17 of preheating the molds and preliminary vulcanization of the gel. The heated forms with latex film pass through the drying and vulcanizing chamber 18, through the steaming bath 19 to facilitate removal and enter the device for removing products from forms 20.

 The removal of products is carried out automatically with continuous movement of the conveyor by a stream of a solution flowing out of several nozzles under pressure.

 Subsequently, the cycle repeats.

 Currently, design and technological documentation has been developed and a prototype of the line is being produced.

Claims (3)

 1. A method of manufacturing dipped rubber products, in which molds for dipped rubber products are mounted on a continuously moving conveyor, the molds freed from the products are washed and mechanically cleaned, then a coagulant is applied to the molds in the bath, the molds are dried and immersed from the bath with latex mixtures and dried, characterized in that before washing the molds, they are treated with an alkaline solution, and during mechanical cleaning the molds are rinsed simultaneously, then they are cleaned with an acid solution and immersed in a bath with a weak, weak alkaline solution the target, and the substrate is dipped in a coagulant sequentially first coagulant comprising a salt of the acid cleaning solution, and then increased in the second coagulant concentration and the desired viscosity.  2. The method according to claim 1, characterized in that the molds coated with coagulants and dried are immersed in the baths of the first and second with latex mixtures in series with a period of time sufficient to drip from the form of drops of the latex mixture, drying the film deposited in the first bath , and eliminating delamination of the film deposited in the second bath to obtain two-layer products.  3. A device for the manufacture of dipped rubber products, containing a continuously moving chain conveyor, closed in a vertical plane, with pivotally mounted mold holders, means for cleaning and drying and baths for coagulants and latex mixtures, characterized in that it is equipped with series-installed bathtubs for a cleaning form of an acid solution, for a hot weak alkaline solution, for a coagulant containing salts of a cleaning solution, and for a coagulant of an increased concentration and viscous viscosity tee, and baths with latex mixtures are installed at a distance from each other, providing a minimum period of time between the exit forms from the first bath and immersing them in the second bath, and the conveyor between the baths with latex mixtures is equipped with a device to provide the desired angle of exit of forms from the first bath and the entry of the forms into the second bath at the time of lifting the molds from the first bath to a maximum height.

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