RU2489183C1 - Tear mask and method of its manufacturing - Google Patents

Abstract

FIELD: rescue equipment.

SUBSTANCE: invention relates to the field of personal respiratory protection means and can be used in industrial production. The tear mask comprises a panoramic eyepiece assembly and face seal. On the seal the units of inhalation and exhalation and a membrane device are located. The face seal, units of inhalation and exhalation, the membrane device and the eyepiece assembly are an integrated whole, at that the area of the eyepiece assembly is 75-90% of the area of the cast surface of the mask. The mask is manufactured by a method which consists in placing in the casting mould of units of inhalation, exhalation, the membrane device and filling the moulding cavity of the casting mould. The casting mould is first filled with thermoplastic polyurethane to form an optically transparent eyepiece assembly. The perimetre of the cavity which is preliminary limited in the form by a barrier which is removed before the subsequent filling in the form of a styrene-ethylene-butylene-styrene to form the face seal.

EFFECT: improved flexibility and increased tightness of the mask.

3 cl, 7 dwg

Description

The invention relates to the field of individual respiratory protection of a person and can be used in industrial

production.

Known gas mask PFM-1, containing a panoramic spectacle unit made of glass, and a rubber front obturator with inspiration, expiration and membrane devices located on it (see. "Industrial respiratory and skin personal protective equipment", catalog of JSC Himconverse , publishing house "Talent", Moscow, 1997).

Compared with the proposed one, this mask is heavier, less flexible and more difficult to manufacture.

Closest to the inventive gas mask is a mask containing a panoramic glass knot made of glass and a front obturator, on which there are inhalation, expiration and membrane devices (see EP No. 2151759 dated 04.02.02009, class A62B 18/02, 18/08). This mask is taken as a prototype of the invention.

The disadvantage of the prototype is that its panoramic eyeglass unit contains glass, which makes the mask heavier, makes it less flexible, requires prefabrication and subsequent processing with adhesive lubricant, and is also ergonomically less comfortable due to the smaller area of the eyeglass unit.

The objective of the invention is to provide a sealed, flexible, durable and lightweight gas mask that exceeds existing analogues in ergonomic characteristics, as well as in manufacturability.

The problem is solved by the invention, in which the gas mask contains a face seal with the nodes of inspiration, expiration, a membrane device and a panoramic eyeglass unit, which are a single unit, while the area of the eyeglass unit is 75-90% of the area. cast surface of the mask. In addition, the spectacle unit is made of thermoplastic polyurethane, and the obturator is made of styrene-ethylene-butylene-styrene, ensuring the tightness of their connection and the strength of the mask.

The difference between the proposed mask and the prototype is that the face obturator, inhalation and exhalation nodes, the membrane device and the eyeglass node are a single unit, while the area of the eyeglass node is 75-90% of the cast surface of the mask. Another difference is that the eyeglass unit is made of thermoplastic polyurethane, and the obturator is made of styrene-ethylene-butylene-styrene, ensuring the tightness of their connection and the strength of the mask.

At the filing date, the proposed gas mask can only be performed using the new manufacturing method described below.

A known method of manufacturing a gas mask, which uses panoramic glass with pre-applied melamine coating to achieve resistance to damage and adhesion with a seal. This glass, the inspiratory, expiratory nodes and the membrane device are placed in a cavity of a facial shape with its subsequent filling with an opaque polymer composition forming a facial obturator (see EP No. 2165739 dated 02.02.02009, class A62B 18/02, 18/08) . This method is adopted as a prototype of the described method of manufacturing a gas mask.

The disadvantage of the prototype is the need for a separate technological process for manufacturing a spectacle assembly of glass, its lubrication, as well as rigid fixation of the glass in the mold.

The solution to the above problem is also achieved using the proposed new method of manufacturing a gas mask, including placement of injection units, breaths, a membrane device and filling the injection mold cavity with thermoplastic polyurethane first to form an optically transparent eyeglass unit, the perimeter of which is pre-shaped limit the partition, which is removed before subsequent filling in the form of styrene-ethylene-butylene-styrene to form a seal.

The difference between the proposed method and the prototype is that thermoplastic polyurethane is first poured into the injection mold to form an optically transparent eyeglass unit, the perimeter of the cavity of which in the form is preliminarily limited by a partition, which is removed before subsequent filling into the form of styrene-ethylene-butylene-styrene to form a seal .

An analysis of the patent and scientific and technical literature showed that the proposed gas mask and the method of its manufacture are novel.

The figure shows the proposed mask, where

1 - panoramic spectacle node;

2 - front obturator;

3 - membrane device;

4 - node inspiration;

5 - exhalation node.

The mask works as follows. The purified air through the inspiration unit (4) enters the under-mask space of the gas mask for breathing, and the exhaust air through the exhalation unit (5) is removed from the under-mask space.

The essence of the invention lies in the fact that to obtain a flexible, durable, lightweight gas mask, in which the front obturator, inspiratory and expiratory nodes, the membrane device and the eyeglass unit are a single unit, the perimeter of the cavity of the eyeglass unit is preliminarily enclosed in the mold cavity thermoplastic polyurethane is poured into it with pressure, the septum is removed and poured into the form of styrene-ethylene-butylene-styrene, forming the front obturator, under pressure. Thus, the entire mask manufacturing process is carried out in one injection mold, on one injection molding machine and in one technological cycle.

The authors did a great job of finding polymer compositions for the eyeglass unit and facial obturator. The most durable were masks with the following combination of polymer compositions.

Example 1. The molding cavity of the injection mold is set by inspiration, exhalation, and membrane devices, the partition that limits the perimeter of the cavity of the eyeglass node is pulled out, and thermoplastic polyurethane is poured into this cavity. After solidification, the septum is removed and the remaining cavity in the cavity is filled with styrene-ethylene-butylene-styrene to form a facial obturator. After solidification, a strong, light, flexible, airtight gas mask is removed from the face mold.

Studies have shown that the transmittance of her eyeglass node is 0.9.

Example 2. The same techniques for the manufacture of masks, only instead of thermoplastic polyurethane, polyvinyl chloride is poured into the cavity of the eyeglass unit. It turned out a mask with satisfactory strength properties, but the light transmittance of its eyeglass node was equal to 0.7.

As a result of numerous studies, the authors came to the conclusion that the most ergonomic, durable, lightweight, flexible and airtight mask is obtained using thermoplastic polyurethane for the eyeglass unit and styrene-ethylene-butylene-styrene for the obturator. The most successful for use were masks, in which the area of the eyeglass node was 75-90% of the area of the cast surface of the mask. If the area of the eyeglass node was less than 75% of the area of the cast surface of the mask, then the visibility deteriorated, if more than 90%, then the seal was broken along the seal line.

The advantages of the proposed technical solution is that due to the design, the materials used, as well as the combination of the proposed simpler technologies, it was possible to obtain a strong, light and inexpensive gas mask with good ergonomic characteristics.

From the foregoing, it follows that each of the prototypes of the claimed combination to a greater or lesser extent affects the achievement of the goal, and the entire population is sufficient to characterize the claimed technical solution.

Claims (3)

1. A gas mask containing a panoramic eyeglass unit and a face sealer with inspiratory, expiratory nodes and a membrane device located on it, characterized in that the face obturator, inspiratory and expiratory nodes, the membrane device and the eyeglass unit are a single unit, and the area of the eyeglass the node is 75-90% of the cast surface of the mask. 2. The gas mask according to claim 1, characterized in that the spectacle assembly is made of thermoplastic polyurethane, and the obturator is made of styrene-ethylene-butylene-styrene, ensuring the tightness of their connection and the strength of the mask. 3. A method of manufacturing a gas mask according to claim 1, comprising placing in the mold the inspiration, expiration, membrane device and pouring the mold cavity of the mold, characterized in that thermoplastic polyurethane is first filled into the mold to form an optically transparent eyeglass unit, the perimeter of the cavity which in the form is preliminarily limited by a septum, which is removed before subsequent filling into the form of styrene-ethylene-butylene-styrene to form a shutter.

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