JP2931174B2 - Manufacturing method of hook-and-loop fastener - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous production method of a hook-and-loop fastener having a pressure-sensitive adhesive layer formed on the back surface of a pile knitted fabric obtained by knitting and weaving. The present invention relates to a method for continuously manufacturing a surface fastener having a large size and no boundary separation.

[0002]

2. Description of the Related Art In recent years, a surface fastener made of a pile knitted fabric having a pressure-sensitive adhesive layer formed on a back surface thereof via a backing layer has been marketed in order to facilitate the attachment of the surface fastener to an object.

One of the manufacturing methods is disclosed in
No. 103408 (Japanese Utility Model Application No. 61-199470)
There is a method proposed by According to a specific example disclosed in the specification, in the method for manufacturing a flush fastener, a backing layer is formed on the pile knitted fabric, and an elastic sheet such as a sponge sheet separately prepared is attached to the surface of the backing layer. After that, an adhesive layer is formed on the surface of the elastic sheet. Here, as a reason for interposing the elastic sheet,
That the adhesive force to the adherend is dispersed by the elastic sheet, and that the elastic sheet prevents the decrease in the adhesive area due to the uneven surface present on the adherend surface, thereby improving the adhesive force or the adhesive force. I have.

[0004]

However, according to the disclosure of the above-mentioned publication, the point of peel strength is mentioned, but the peel strength in the same technology means the internal breaking strength of the elastic sheet. And does not mean the peel strength between the layers. On the other hand, the hook-and-loop fastener has a backing layer, an elastic sheet, and an adhesive layer sequentially laminated and fixed on the back surface of the pile knitted fabric as described above. In the case of the hook-and-loop fastener having such a concept, although the internal breaking strength of the elastic sheet is also important, the problem of boundary separation between the layers is equally important. Not only is it not disclosed, but the boundary is increased in hardness by the adhesive layer, and this type of hook-and-loop fastener may impair its inherent flexibility.

[0005] Generally, the bonding strength of an adhesive to a solid is increased by increasing the bonding area if the material of the adhesive is appropriate. On the other hand, it is difficult to evenly bond the entirety of the fixed surface with the bonding between the two objects with the adhesive,
In addition, a boundary layer made of an adhesive is necessarily formed on the fixing surface, and this boundary layer increases the hardness between the two objects integrated with each other, thereby losing the original feel of the two objects and giving the foreign object feeling. The boundary layer is naturally formed also in a case where a solid is adhered to the surface of a resin layer (adhesive layer) before one of them is cured, and then the resin layer is cured and fixedly integrated. The formation of such a boundary layer leads to an increase in the hardness, particularly when flexibility or flexibility is required for the bonded and integrated article, so that it is preferable to avoid it as much as possible.

However, in the surface fastener disclosed in the above publication, the boundary layer is formed not only between the elastic sheet and the pressure-sensitive adhesive layer but also between the backing layer of the pile knitted fabric and the elastic sheet. As a result, the characteristics of the surface fastener made of a knitted fabric that requires flexibility and flexibility are lost.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to secure the peeling strength between layers and to maintain the flexibility and flexibility of a surface fastener made of a knitted fabric. An object of the present invention is to provide a method for manufacturing a fastener.

[0008]

In order to achieve this object,
The present invention provides a method for manufacturing a hook-and-loop fastener having a plurality of hook pieces or loop pieces formed on a surface thereof by a pile knitted and woven integrally with a knitted fabric, and having an adhesive layer on a back surface of the knitted fabric. Knitting, forming a first backing layer by coating a back surface of the piled knitted woven fabric with a synthetic resin material, and curing the synthetic resin material constituting the first backing layer before the curing. Coating the surface of the first backing layer with a cellular synthetic resin material mainly composed of a material having the same quality or affinity as the resin material to form a second backing layer continuously; forming a second backing layer; Then, the pile is heat-set, and the first and second backing layers are continuously cured and dried, and the surface of the second backing layer having a cellular structure after the first and second backing layers are dried. Apply adhesive to Ingu to drying, to become comprises the steps of be continuously adhered to release paper to dry surface of the adhesive has a main structure.

The cell structure may be formed by foaming simultaneously with drying of the first and second backing layers, or when the first backing layer is coated, the second backing layer may already have a cell structure. You may. In the case of manufacturing a male surface fastener, a side portion of the pile is partially cut between a drying step of the first and second backing layers and a coating step of the adhesive to form a hook piece. Form. Further, the pressure-sensitive adhesive may contain a foaming agent in some cases.

[0010]

A solution or emulsion of a synthetic resin material is continuously coated on the back surface of a woven pile fabric to form a first layer.
When the backing layer is in a molten state, the coating surface is coated with a solution containing a homogeneous material or a synthetic resin material having a high affinity for the first backing layer as a main material and containing a foaming agent to form a second backing layer. Form. Therefore, the boundary surface of the second backing layer and the boundary surface of the first backing layer are integrated in a fused state, and the boundary layer hardly appears.

After the first and second backing layers have been formed in this way, the pile fabric having the backing layer formed thereon is subsequently sent to a drying section, where it is dried at a high temperature and the fabric is heat-set at the same time as the first fabric. And the second backing layer is cured. Even at the time of curing and drying, a high-hardness boundary layer is not formed at the boundary between the first and second backing layers in the fused state as described above, and the resin does not lose the original flexibility and flexibility of the surface fastener. When the original flexibility is maintained and the foaming agent is simultaneously foamed at the time of drying, a partial foaming pressure acts on the first backing layer at the boundary portion to increase the adhesion area of both. ,
The fusion state is further promoted, and strong adhesion is obtained.

When manufacturing the male surface fastener, the above-mentioned tape for the surface fastener having the cured backing layer is successively sent to the hook forming portion, and the side of the pile portion composed of the monofilament is cut with a clipper in a conventional manner. To form hook pieces. When manufacturing a female surface fastener, the loop is heat-set in the drying step, and in that state, the loop is sent to the next step of applying the pressure-sensitive adhesive layer.

The surface of the second backing layer of the hook-and-loop fastener thus obtained is then coated with a known adhesive and then dried through a drying step. After this drying,
Release paper is continuously adhered to the surface of the pressure-sensitive adhesive layer. Second
When the pressure-sensitive adhesive is applied to the surface of the backing layer, there are many bubbles having various shapes generated by foaming on the surface of the backing layer, and a part of the pressure-sensitive adhesive penetrates into the bubbles. Increase bonding area and integrate. In addition, the pressure-sensitive adhesive portion that has entered the air bubbles exhibits an anchor effect, and exhibits a strong adhesive force different from the adhesion between the flat surfaces.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 2 shows the male piece structure of the surface fastener obtained by the method of the present invention.

As is apparent from FIG. 1, a hook-and-loop fastener 1 manufactured by the method of the present invention is usually used for fixing a knitting structure on the back surface of a pile knitted fabric 2 having a large number of hook pieces 2a. A first backing layer 3 is formed by coating a synthetic resin backing material to be used, and a second backing made of a foam is formed on the surface of the backing layer 3 with almost no boundary surface with the first backing layer. The layer 4 is formed integrally, and further, the pressure-sensitive adhesive layer 5 is integrated on the surface thereof by coating by a usual coating means. A release paper 6 is adhered to the surface of the pressure-sensitive adhesive layer 5 according to a standard method.

The material of the first backing layer 3 is not particularly limited, and a commonly used synthetic resin solution or emulsion of polyurethane, polyamide, polyester, polyacryl or the like is used.

The formation of the second backing layer 4 in the present invention is a portion which is the most important component for the present invention in securing the peel strength at the interface between the first backing layer 3 and the pressure-sensitive adhesive layer 5. First of all, it is essential that the main material of the second backing layer 4 is a synthetic resin having the same or extremely high affinity as the synthetic resin material used for the first backing layer. is there. In the present invention, the same material as that usually used for the first backing layer 3 is used. A second important point is that the synthetic resin material of the second backing layer 4 must form a foam at least after curing. The foaming mechanism is one that generates a gas by causing a chemical reaction by heating or by an auxiliary component, one that generates a gas during the condensation polymerization process, or one that is foamed by mechanical means such as stirring to form a foam. Alternatively, there is a method in which an inert gas is absorbed by a material under high pressure and foamed at normal pressure. A third important point is the timing of forming the second backing layer 4. That is, the synthetic resin material constituting the second backing layer 4 in the present invention must be applied in a state where the first backing layer 3 is coated on the back surface of the pile knitted fabric 2 and has not yet been cured.

The second backing layer 4 may be foamed at the same time as being applied to the back surface of the first backing layer 3 or may have a cellular structure before it, or the first and second backing layers 3 ,
4 may be foamed at the time of drying and curing. As a means for applying the first and second backing layers 3 and 4, a normal means such as knife coating and roll coating can be employed.

When a male piece of a hook-and-loop fastener is manufactured, after the first and second backing layers are cured through a drying process, the side portions of a number of piles parallel to the surface of the pile knitted fabric 2 are cut. Thus, a hook piece 2a is formed. An adhesive is applied to the surface of the second backing layer 4 having a cured and cellular structure,
Further, a release paper 6 is adhered to the surface of the adhesive layer 5 after drying. As the adhesive, an acrylic or rubber-based adhesive is used.

FIG. 1 shows a typical example of a manufacturing process of a surface fastener configured as described above. In this embodiment,
In weaving the pile woven fabric, a tape for a hook-and-loop fastener was woven by a needle loom using a monofilament yarn composed of 360d polyester and a warp yarn and a weft composed of 300d / 15f multifilament.

Immediately after forming the first backing layer by continuously coating the back surface of the woven tape with a polyester solution, the coated surface is further coated with a polyester solution containing 2 to 15% by weight of a foaming agent. And second
A backing layer was formed. At this time, the boundary surface of the second backing layer and the boundary surface of the first backing layer are integrated with each other in a fused state, and the boundary layer hardly appears.

After the first and second backing layers have been formed in this way, the pile fabric having the backing layer is subsequently sent to a drying section, where it is dried at a high temperature of 120 ° C. to 180 ° C. and the first and second backing layers are dried. The backing layer cures. Even at the time of drying, a high-hardness boundary layer is not formed at the boundary between the first and second backing layers in the fused state as described above, and the original flexibility of the resin is maintained. Since the foaming agent foams at the same time, a partial foaming pressure acts on the first backing layer at the boundary portion, so that the bonding area between the two increases, and strong bonding can be obtained.

The tape for a hook-and-loop fastener having a hardened backing layer is subsequently sent to a hook forming section, and the side of a pile portion composed of monofilament is cut with a clipper in a conventional manner to form a hook piece. . Next, an acrylic pressure-sensitive adhesive is applied to the surface of the second backing layer of the hook-and-loop fastener tape, and then dried through a drying process. After this drying, a release paper is continuously adhered to the surface of the pressure-sensitive adhesive layer.

When an acrylic pressure-sensitive adhesive is applied to the surface of the second backing layer, the surface of the backing layer has many irregularities having various shapes caused by foaming. Penetrates into the concave portion to increase the bonding area and integrate. In addition, the pressure-sensitive adhesive portion that has penetrated into the concave portion has an anchor effect, and a strong adhesive force different from the adhesion between the flat surfaces is exerted.

In the present invention, the pressure-sensitive adhesive may contain a foaming agent. In this case, by forming the pressure-sensitive adhesive layer into a bubble structure, when the hook-and-loop fastener is attached to the adherend, the bubble portion exerts the function of the suction plate to improve the adherence effect, and at the same time, When the body surface has a slight uneven portion, the convex portion is absorbed by the bubble portion, and the adherence is maintained.

[0026]

As is apparent from the above description, according to the method for manufacturing a surface fastener having a pressure-sensitive adhesive layer on the back surface of the present invention, the second backing layer made of the same material is used before the first backing layer is cured. Since the surface of the first backing layer is coated, the boundary portion is completely integrated in a fused state with each other, maintaining the original flexibility and flexibility of the hook-and-loop fastener. Disappears. In particular, in the present invention, when the second backing layer is foamed as the second backing layer before the first and second backing layers are cured, the action of the foaming pressure promotes the fusion state and increases the adhesive force. .

An effective point of the method for manufacturing a surface fastener having an adhesive layer on the back surface of the present invention is that the second backing layer formed as described above has a cellular structure.
For this reason, a part of the pressure-sensitive adhesive layer applied and integrated on the surface of the second backing layer penetrates into bubbles formed on the surface of the second backing layer, and the penetrated portion exerts an anchor effect of the pressure-sensitive adhesive layer. And the adhesive strength between the two is further increased, and the peeling strength is significantly improved.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an example of a manufacturing process of a surface fastener having a pressure-sensitive adhesive layer on the back surface of the present invention.

FIG. 2 is a cross-sectional view of an example of a surface fastener manufactured by the method of the present invention.

[Explanation of symbols]

 Reference Signs List 1 surface fastener 2 pile fabric 2a hook piece 3 first backing layer 4 second backing layer 5 adhesive layer 6 release paper

Claims (5)

(57) [Claims] 1. A hook-and-loop fastener having a pressure-sensitive adhesive layer (5) on the back surface of a plurality of hook pieces or loop pieces formed on the surface by a pile that is knitted and woven with the knitted fabric (2). Forming a first backing layer (3) by knitting the pile knitted fabric (2) with a synthetic resin material on the back surface of the knitted pile knitted fabric (2); Before the synthetic resin material constituting the backing layer (3) is cured, a foamed synthetic resin material whose main material is a material having the same or an affinity as the synthetic resin material is used as a material for the first backing layer (3). Coating the surface to form a second backing layer (4) continuously; forming a second backing layer (4); heat-setting the pile; and forming the first and second backing layers (3). , 4) are continuously cured and dried, and after the first and second backing layers (3, 4) are dried, a cell structure is formed. Coating and drying an adhesive on the surface of the second backing layer having the following, and continuously adhering release paper (6) to the surface of the dried adhesive. The manufacturing method of the surface fastener characterized by the above-mentioned. 2. A method for manufacturing a surface fastener according to claim 1, wherein said second backing layer (4) is foamed simultaneously with drying of said first and second backing layers (3, 4). 3. The method according to claim 1, wherein the bubbles in the second backing layer (4) are formed in the first backing layer (4).
2. The method for producing a hook-and-loop fastener according to claim 1, wherein the hook-and-loop fastener is formed before drying the second backing layer (3, 4). 4. Between the drying step of the first and second backing layers (3, 4) and the coating step of the adhesive, the side of the pile is partially cut to form a hook piece (2a). The method for manufacturing a surface fastener according to claim 1, wherein: 5. The method for producing a surface fastener according to claim 1, wherein the pressure-sensitive adhesive contains a foaming agent.