RU2379394C1 - Threadless seam for tight connection of materials - Google Patents

Abstract

FIELD: textile industry.

SUBSTANCE: threadless seam comprises two layers of material, which are joined by tight tape, at the same time additional layer of tight tape is arranged as turned on face side along seam surface, the main layer of tight tape is located either as bended for turned outside or inside joined materials depending on seam design, and connection tape used is represented by elastic self-adhesive material on the basis of water dispersion of copolymer of butyl acrylate, acrylonitrile and methacrylic acid.

EFFECT: use of invention makes it possible to connect materials with various properties, to improve seam strength with simultaneous imparting of elasticity to it.

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Description

The invention relates to the clothing industry of light industry and can be used in the manufacture of protective clothing, namely, personal respiratory protective equipment and personal skin protective equipment, for the tight connection of materials of dissimilar properties, for example, an airtight heat-resistant film and elastic film or textile material.

Known sealed seam for joining elastic waterproof materials, in which the layers of materials filed through the guides are connected by thread stitching. Between the layers of materials are sealing tape and / or glue. The finished sections are subjected to subsequent heating and / or compression in order to fill the voids inside the seam cavity and partially the holes from the needle puncture with tape and / or glue / pat. 0327291, European Patent Office, IPC 41 D 27/24, B29C 65/50. Waterproof seam. / Evans W.E., Schofield M.J., Barton P. (Great Britain); Patent Attorney Lain S.J. (United Kingdom). - No. 89300890.4; declared 01/30/88; publ. 08.09.89, Bull. No. 89/32. - 4 p.: Ill. /.

The disadvantages of the seam are the use of thread stitching, which leads to an irreversible violation of the integrity of the package of materials in the place of puncture with a needle and, as a result, to a decrease in operational properties, a significant decrease in the strength of the seam; the need to use additional excipients, in addition to sealing tape. In addition, thread stitching complicates the process of stitching such materials.

The closest analogue of the claimed invention is a non-threading adhesive method formed seam according to US patent No. 7005021, IPC A41D 27/24, B29C 65/00. Method of forming and adhesively bonded seam. / Kramer Paul Frederick (Berkeley, US). - US20040851409; declared 2004.05.21; publ. 2005.10.20 (description and abstract), intended for the processing of garments, connecting the edges of two cloths of fabric having different front and wrong surfaces, due to the location of two strips of adhesive tape, also having different front and wrong sides. The first strip of tape is located between the front sides of the fabric cloths flush with their overlapping edges. The second strip of tape is located on the wrong side of the second of the paintings. One edge of the second strip of tape is also located along the superimposed edges of the webs, one of which is bent along the seam, and the second edge of the strip of tape is located inside the fold of this canvas. The formation of adhesive bonding is carried out through the use of ultraviolet welding.

The disadvantage of this filamentless seam is the ability to obtain it only with additional activation of the adhesive tape by pressing during the action of ultrasonic welding. So, it is formed only when using special expensive equipment. In order to achieve the required strength of the adhesive joint, preliminary adjustment of the equipment should be performed and rational welding modes selected taking into account the chemical nature of the joined material webs. For individual materials, such a connection when using welding is impossible, for example, the connection of a rubber film with other materials.

The technical result of the invention is the ability to connect materials of dissimilar properties, increasing the strength of the seam while simultaneously giving it elasticity.

The specified technical result is achieved by the fact that in a non-filament seam for a tight connection of materials containing two layers of material connected by an airtight tape, according to the invention it includes an additional layer of an airtight tape located in a turn on the front side along the surface of the seam, the main layer of an airtight tape is located or fold, either a turn around the outside or inside of the materials to be joined, depending on the design of the seam, and use elastic self-adhesive material as a connecting tape based on an aqueous dispersion of a copolymer of butyl acrylate, acrylonitrile and methacrylic acid.

The drawings show the inventive filamentless seam (cross section):

figure 1, figure 2 - overhead lap with open sections;

figure 3 - invoice end-to-end with open sections;

figure 4, figure 5 - invoices with one closed slice.

Improving the strength and elasticity of the seam is ensured by the differentiated choice of the placement of layers of materials connected relative to each other and fixing them in a predetermined position using adhesive material. The location of the slices of the joined layers of materials with an offset by a predetermined amount (Fig. 1, Fig. 2) provides a more reliable position and helps to increase the strength of the seam.

The combination of dissimilar materials, one layer of inelastic, and the other elastic or one layer of low elasticity, and the other with higher elasticity, using an elastic self-adhesive material based on an aqueous dispersion of a copolymer of butyl acrylate, acrylonitrile and methacrylic acid provides the joint's ability to not collapse under the action of transverse tensile deformations and longitudinal tensile loads regardless of the initial elasticity of the layers.

With an increase in the number of layers in the seam (Fig. 4, Fig. 5), the thickness of the bag and, accordingly, the strength increase. Moreover, due to the use of the above-described elastic self-adhesive material in the seam, the elasticity is maintained.

The seam (figure 1) contains two layers of material: heat-resistant flexible material 1 (polyimide film), elastic film material 2 (TU 38105735-85, grade B-201 or 51-1565) or elastic textile material connected by an airtight tape 3 on the basis of aqueous dispersion of a copolymer of butyl acrylate, acrylonitrile and methacrylic acid, while in the tape the content of the aqueous dispersion of a copolymer of butyl acrylate is more than 60%. The main layer of the airtight tape 3 is folded, doubled inside the joined materials, with the adhesive side 4 facing the connected materials 1, 2. The edges of the airtight tape 3 and the edges 6 and 7 of the connected layers of materials 1 and 2 are respectively located in a straight line. An additional layer 7 of sealed tape is located on the front side along the surface of the seam, at least 3 mm beyond the edge 5 of part 1.

The seam (figure 2) contains two layers of material: heat-resistant flexible material 1 (polyimide film), elastic film material 2 (TU 38105735-85, grade B-201 or 51-1565) or elastic textile material connected by an airtight tape 3 on the basis of aqueous dispersion of a copolymer of butyl acrylate, acrylonitrile and methacrylic acid, while in the tape the content of the aqueous dispersion of a copolymer of butyl acrylate is more than 60%. The main layer of the airtight tape 3 is located in a turn outside of the materials to be joined, with the adhesive side 4 facing the materials to be joined 1, 2. The edges 6 and 7 of layers 1 and 2 respectively go one after another, at least 3 ... 5 mm, which allows more strong, reliable connection for films of medium thickness, without reducing its elasticity along the width of the connection. An additional layer 7 of sealed tape is located in a turn from the front side along the surface of the seam parallel to the main layer 3.

The seam (figure 3) contains two layers of material: heat-resistant flexible material 1 (polyimide film), elastic film material 2 (TU 38105735-85, grade B-201 or 51-1565) or elastic textile material connected by an airtight tape 3 on the basis of aqueous dispersion of a copolymer of butyl acrylate, acrylonitrile and methacrylic acid, while in the tape the content of the aqueous dispersion of a copolymer of butyl acrylate is more than 60%. The main layer of the airtight tape 3 is located at a turn outside of the materials to be joined, with the adhesive side 4 facing the materials to be joined 1, 2. The place of connection of the materials 1 and 2 runs in the middle of the airtight tape 3. The additional layer 5 of the airtight tape is turned around from the front along the surface of the seam parallel to the main layer 3.

The location of all the components of the seam in the plane allows you to reliably connect thick films, while obtaining elastic joints.

The seam (figure 4) contains two layers of material: heat-resistant flexible material 1 (polyimide film), elastic film material 2 (TU 38105735-85, grade B-201 or 51-1565) or elastic textile material connected by an airtight tape 3 on the basis of aqueous dispersion of a copolymer of butyl acrylate, acrylonitrile and methacrylic acid, while in the tape the content of the aqueous dispersion of a copolymer of butyl acrylate is more than 60%. The main layer of the airtight tape 3 is curved, doubled inside the joined materials, with the adhesive side 4 facing the joined materials 1, 2. The edge 5 of the elastic film material 2 extends beyond the fold of the tape 3 by 2 ... 3 mm. The edges of the sealed tape 3 and the edge 7 of the film material 1 are located in a straight line. An additional layer 5 of sealed tape is located in a turn from the front side along the surface of the seam, extending at least 3 mm beyond the edge 6 of layer 1.

Approaching the cut of the lower part for folding the self-adhesive tape allows you to get a more durable, reliable connection.

The seam (figure 5) contains two layers of material: heat-resistant flexible material 1 (polyimide film), elastic film material 2 (TU 38105735-85, grade B-201 or 51-1565) or elastic textile material connected by an airtight tape 3 on the basis of aqueous dispersion of a copolymer of butyl acrylate, acrylonitrile and methacrylic acid, while in the tape the content of the aqueous dispersion of a copolymer of butyl acrylate is more than 60%. The main layer of the airtight tape 3 is located bend outside the materials to be joined, with the adhesive side 4 facing the materials to be connected 1, 2. The edges 5 and 6 of the connected layers of materials 1 and 2 are respectively located in a straight line. Part 1 is bent at the seam. An additional layer 5 of sealed tape is located in a turn from the front side along the surface of the seam, extending at least 3 mm beyond the fold of layer 1.

To obtain the seam in figure 1, pre-cut layers of materials 1 and 2 are stacked on top of each other, and the edge 6 of layer 2 is offset by half the width of the sealed tape 3 relative to the edge 5 of layer 1. The layers laid in this way are placed under the roller foot of the threadless machine for sealing the seams , for example, KS25 from Typical. The main layer of the airtight tape 3 is glued on top, while the edges of the tape 3 and layer 1 are equalized. Layer 2 is bent in the opposite direction, forming a fold in the middle of the airtight tape 3. The resulting package of materials is turned on the opposite side, laid under the roller foot of a threadless machine for sealing joints and an additional layer of airtight tape 7 is glued, orienting the middle of the airtight tape 7 to the edge 5 of layer 1 .

To obtain the seam in figure 2, pre-cut layers of material 1 and 2 are overlapped, the margin of the edges 6 and 7 of layers 1 and 2, respectively, is 3 ... 5 mm, placed under the roller foot of a threadless machine for sealing joints, for example, KS25 from Typical . The main layer of the airtight tape 3 is glued from above, with the overlapping zone of the edges of the material layers 1 and 2 in the middle of the tape 3. The resulting package of materials is turned on the opposite side, placed under the roller foot of the threadless machine for sealing joints and an additional layer of airtight tape 5 is glued, orienting the middle of the airtight tape 5 to the overlapping zone of the edges of the layers of materials 1 and 2.

To obtain the seam in figure 3, pre-cut layers of materials 1 and 2 are laid end-to-end and placed under the roller foot of a threadless machine for sealing seams, for example, KS25 from Typical. On top, the main layer of the airtight tape 3 is glued, positioning the junction of layers 1 and 2 in the middle of the tape 3. The resulting package of materials is turned on the opposite side, laid under the roller foot of the threadless machine to seal the seams and the additional layer of the airtight tape 7 is glued, orienting the middle of the airtight tape 7 to the junction of layers 1 and 2.

To obtain the seam in figure 4, pre-cut layers of materials 1 and 2 are laid on top of each other, and the edge 5 of layer 2 is offset by an amount equal to half the width of the sealed tape minus 2 ... 3 mm, relative to the edge 6 of layer 1. The layers laid in this way are placed under the roller foot of a threadless machine for sealing joints, for example, KS25 from Typical. The main layer of the airtight tape 3 is glued on top, while the edges of the tape 3 and layer 1 are equalized. Layer 2 is bent in the opposite direction, forming a bend in the middle of the sealed tape 3, while the edge of the layer 2 extends beyond the bend of the tape by 2 ... 3 mm. The resulting package of materials is turned on the opposite side, laid under the roller foot of a threadless machine to seal the seams and an additional layer of sealed tape 7 is glued, orienting the middle of the sealed tape 7 to the edge 6 of layer 1.

To obtain the seam in figure 5, pre-cut layers of materials 1 and 2 are laid end-to-end and placed under the roller foot of a threadless machine to seal the seams, for example, KS25 from Typical. The main layer of the airtight tape 3 is glued on top, positioning the junction of layers 1 and 2 in the middle of the tape 3. The resulting package of materials is bent in half in the middle of the airtight tape 3, placing it outside the joined layers. Bend the layer 1 in the opposite direction, enveloping the airtight tape 3. The layers of the package oriented in this way are laid under the roller foot of the threadless machine for sealing the seams and an additional layer of the airtight tape 7 is glued, orienting the middle of the airtight tape 7 to the fold of layer 1.

The choice of the design of the joint of the non-thread adhesive joint is determined by the thickness of the materials being joined and the requirements for their elasticity and strength.

The connection of parts with a self-adhesive tape is made due to mechanical pressure at the junction.

The inventive seam allows you to get an elastic connection of parts of heterogeneous materials, characterized by tensile strength in the transverse and longitudinal directions, tightness, which ensures the reliability of the joints during operation.

The main layer of elastic self-adhesive tape allows you to get a tight connection without violating the integrity of the materials being joined, which cannot be achieved with welded and thread methods of connection, especially for non-thermoplastic film materials. The ability of the tape to deform simultaneously with the elastic material without peeling from it increases the operational properties of the materials being joined.

Fixing the seam allowances with the help of an additional layer of tape to the surface of one of the parts significantly increases the strength of the seam, since the obtained seam works both at shear and delamination, which is not ensured by the use of the weld due to the impossibility of weld formation on the surfaces of non-thermoplastic materials, for example, polyimide film - elastic material.

The design of the inventive seams allows you to connect materials with a self-adhesive tape in a plane in the expanded form, which ensures simplicity, convenience and quality of the compounds obtained.

Claims (1)

A non-filament seam for the tight connection of dissimilar materials, containing two layers of material connected by an airtight tape, characterized in that the seam contains an additional layer of airtight tape spaced from the front side along the surface of the seam, the main layer of the airtight tape is either folded or rotated outside or inside materials to be connected, depending on the design of the seam, and as a connecting tape use an elastic self-adhesive material based on an aqueous dispersion of copolymer but ilacrylate, acrylonitrile and methacrylic acid.

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