JPS63235581A - Powder web and its production - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a powder web formed by sprinkling thermoplastic powder on a web (nonwoven fabric), and a method for producing the powder web. This invention relates to improvements for increasing the adhesion of powder webs.

[Conventional technology]

Generally speaking, powder web is different from web (non-woven fabric).
For example, it is formed by scattering thermoplastic powder such as synthetic resin, and by overlapping and heating a plurality of powder webs formed in this way and bonding the powder webs to each other in a polymeric state, it is possible to It is provided so that shoulder butts etc. which are buried in both shoulder portions of the can be formed.

Conventionally, a powder web manufacturing method involves scattering thermoplastic powder onto a needle-punched web, and then heating the web to melt a portion of the thermoplastic powder. A method of attachment has been proposed.

That is, a method has been proposed in which a powder web is manufactured through the following steps: 1) web production process, 2) needle punching process, 2) thermoplastic powder spreading process, and 2) heat treatment process.

[Problem that the invention seeks to solve]

However, with the conventional powder web as mentioned above,
There is a problem in that the surface of the web is fluffy and uneven, so the thermoplastic powder sprinkled on the web during the thermoplastic powder dispersion process gets into the recesses formed on the surface of the web. . In other words, when thermoplastic powder enters into the recesses of the web, the adhesive strength between the powder webs is significantly reduced when multiple powder webs are bonded together in a polymerized manner. There is a problem in that it causes In order to solve such problems, it is necessary to increase the amount of thermoplastic powder used, and in this way, in order to increase the adhesive strength between each powder web, thermoplastic powder is used more than necessary. If a large amount is used, not only will the manufacturing cost become high, but a new problem will occur in that the texture (softness) of the product will be impaired.

The present invention is an attempt to improve the above-mentioned problems, and the purpose of the present invention is to make it possible to strengthen the adhesive strength without using a large amount of thermoplastic powder. It has some problems.

That is, the present invention is characterized in that the above-mentioned problems can be solved by attaching thermoplastic powder to the surface of the rolled and heated web. The specific means and effects are as follows.

[Means for solving problems]

(2) The surface of the web is formed flat by eliminating fuzz and unevenness through rolling and heating, and thermoplastic powder is attached to the surface of the web to temporarily fix it.

■ In a powder web manufacturing method comprising a web making process, a needle punching process, a thermoplastic powder spreading process, and a heat treatment process, the powder web is manufactured by interposing a rolling heat treatment process between the needle punching process and the thermoplastic powder spreading process. . That is, in a method for producing a powder web, in which a web is prepared, the web is needle punched, thermoplastic powder is sprinkled on the surface of the web, and then heat treatment is performed. After that, the web is passed through a thermal calendar to be rolled and heated, and then a thermoplastic powder is sprinkled on the surface of the web to temporarily fix it.

[For production]

By passing the needle-punched web through a thermal calender, the fluff and unevenness of the web can be eliminated through the rolling and heating effects of the thermal calender, and the surface of the web can be made flat. Conditions for heating the web are obtained. By scattering the thermoplastic powder on the surface of the web that has been rolled and heated in this way, a state can be obtained in which the thermoplastic powder adheres (thermally welds) to the surface of the web without penetrating into the web. .

〔Example〕

Specific embodiments of the present invention will be described below with reference to illustrative drawings.

In each drawing of FIG. 1 to FIG. 4, 1 is a thermal calendar, and the thermal calendar 1 is composed of a pair of thermal rolls IA and IB that are rotatably horizontally suspended with an appropriate gap between them. A web 2 made of synthetic resin and formed into a fluffy shape is provided between the surface heating rolls IA and IB so as to be able to apply appropriate heat and roll it. Although not shown in the drawings, a web forming device and a needle punching device are respectively provided as a pre-stroke of the isothermal calender 1, and the web 2 is formed by both devices. On the other hand, a dusting bag W3 is disposed in the post-stroke of the thermal calendar 1, and is provided so that the dusting bag W3 can be used to spread synthetic resin powder (thermoplastic powder) 4 onto the surface of the web 2 by the dusting device 3. In the dispersing device 3, 3A is a hopper that stores synthetic resin powder 4, 3B is a surveying cylinder that faces the bottom of the hopper 3A and is rotatably suspended horizontally, and 3C is the same surveying cylinder 3.
A brush cylinder that faces B and is rotatably mounted horizontally, 3
D indicates a conveyor. Although not shown, a heat treatment device for attaching the synthetic resin powder 4 to the web 2 to form a powder web 5 is provided as a subsequent step of the spreading device 3.

When producing the powder web 5, the web 2 produced by the web production device in the web production process is passed through the needle punching machine in the needle punching process, so that a large number of needles are formed in the needle punching machine in the needle punching process. moves up and down, and the web 2 is condensed to about 1/10th the thickness. However, both the front and back sides of the web 2 that has been subjected to the needle punching machine in this way become fluffy and uneven, but in the next process (rolling heat treatment process), the web 2 is passed through a thermal calender l. Through the rolling action of the isothermal rolls LA and IB of the calender 1, fluff and unevenness are eliminated and both the front and back surfaces of the web 2 can be made flat, and the web 2 is made flat through the heating action of the isothermal rolls IA and IB. 2 can be heated to an appropriate temperature.

The web 2 is then conveyed to the next step (thermoplastic powder spreading step) through the rotation of the thermal rolls LA and IB. In the thermoplastic powder spreading process, synthetic resin powder 4 is applied to the surface of the web 2 that has been conveyed from the previous process (heat treatment process).
... is sprayed via the spraying device 3. More specifically, by rotating the surveying cylinder 3B and the brush cylinder 30 of the spreading device 3, the surveying cylinder 3B
A certain amount of the synthetic resin powder 4 in the hopper 3A is stored in a groove carved on the outer peripheral surface of the web 2, and the brush cylinder 30 brushes the synthetic resin powder 4 onto the surface of the web 2. A state of dropping is obtained. In this way, surveying cylinder 3
By scattering a certain amount of synthetic resin powder 4 on the surface of the web 2 via B and the brush cylinder 30,
A state in which the synthetic resin powders 4 are uniformly scattered on the surface of the web 2 is obtained, and a state in which the synthetic resin powders 4 are attached (temporarily fixed) to the surface of the web 2 is obtained.

That is, since the web 2 is rolled into a flat shape by the thermal calendar 1, the synthetic resin powder 4...
In addition to the fact that ・ hardly enters inside the web 2,
Appropriate heat is applied to the web 2 by the thermal calendar 1, so that at the moment when the synthetic resin powder 4... falls from the surveying cylinder 3B onto the surface of the web 2, the synthetic resin powder 4... A portion is melted by the heat of the web 2 and temporarily fixed to the fibers forming the surface of the web 2.

The web 2 is conveyed to the next heat treatment process via the conveyor 3D, with the synthetic resin powder 4 temporarily attached to the surface thereof. In the same heat treatment process, the web 2 is further heated at a constant temperature for a certain period of time, so that the synthetic resin powder 4...
is permanently attached to form a powder web 5.

Then, as an example, a plurality of powder webs 5... formed in this way are cut into approximately semicircular shapes with different sizes, and these are overlapped, and the powder webs 5... After overlapping the Arachne 7, which has a larger area than the powder web 5 and is also cut into a substantially semicircular shape, on the top surface, the synthetic resin powder 4 is melted through a heat treatment device (not shown). By bonding these together in a polymeric manner, the shoulder pad 6 can be formed as shown in FIG. In this way, when the synthetic resin powder 4 is melted and a plurality of powder webs 5 are bonded together in a polymerized manner, the powder webs 5 are coated with synthetic resin powder on their surfaces (flat surfaces). 4 is attached, a strong adhesive state can be obtained without impairing the softness of the shoulder pad 6.

In this embodiment, a spraying device 3 with a brush cylinder 30 was used as a spraying device for the synthetic resin powder 4, but the present invention is not limited to this, and other general spraying devices such as a grooved cylinder may be used. A device may also be used.

〔Effect of the invention〕

The present invention is constructed as described above, in which a web is produced as described above, the web is subjected to twenty dollar punching, and then the web is rolled and heated with a thermal calendar to make it flat. After that, thermoplastic powder is sprinkled on the surface of the web heated in this way to adhere (temporarily fix) it, and then heat treatment is performed to make the thermoplastic powder adhere to the surface of the web in a way that it cannot fall off. As a result, it was possible to obtain a powder web with excellent adhesive strength. In other words, unlike in the past, thermoplastic powder does not enter into the recesses formed on the surface of the web and its adhesive strength decreases, and unlike in the past, more thermoplastic powder than necessary is used to strengthen the adhesive strength. There is no longer a need to use . By making it possible to strengthen the adhesion between each powder web using a small amount of thermoplastic powder, products that bond multiple powder webs together in a polymeric manner (for example, shoulder butts)
In addition to not compromising its softness.

It has now become possible to significantly reduce the manufacturing cost.

[Brief explanation of drawings]

FIG. 1 is a sectional side view of a manufacturing apparatus showing a method for manufacturing a powder web according to the present invention, FIG. 2 is an external perspective view of the powder web according to the present invention, FIG. 3 is an enlarged side view of the powder web, and FIG. It is an external perspective view of a shoulder bat formed using the same powder web. 1... Heat calendar, LA, IB... Heat roll, 2
... Web, 3 ... Spreading device, 3A ... Hopper, 3B ... Surveying cylinder, 3C ... Brush cylinder, 3D ... Conveyor, 4 ... Synthetic resin powder (thermoplastic powder) ), 5... powder web, 6...
Shoulder butt, 7...Arachne.

Claims (2)

[Claims] (1) A powder web formed by rolling the surface of the web into a flat shape and temporarily fixing it by adhering thermoplastic powder to the surface of the heated web. (2) A method for producing a powder web, which comprises preparing a web, performing needle punching on the web, then scattering thermoplastic powder on the surface of the web, and then subjecting the web to heat treatment. A method for producing a powder web, which comprises needle punching, rolling and heating the web through a thermal calendar, and then sprinkling thermoplastic powder on the surface of the web to temporarily fix the web.