JPS6246948B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a separator that is interposed between negative electrode zinc and positive electrode mixture of a dry battery to prevent contact between the two and to retain an electrolyte.

Generally, alkaline manganese dry batteries have a built-in separator that reliably isolates the negative electrode zinc and positive electrode mixture filled in the cylindrical case to prevent contact, and also impregnates and retains the alkaline electrolyte. . Such a separator is usually formed into a cylindrical shape with a laminated structure made of paper having good liquid absorption properties. In addition, separators are required to have high roundness so that assembly can be easily automated, have appropriate overall rigidity, do not deform during handling, and have no variation in outer diameter. It is required that the partition wall function is reliable and that the electrolyte retention property is good.

However, as shown in FIG. 1, in the past, the separator 2 was formed by flatly winding a base paper 1 of an appropriate width several times, so that the adhesive part of the terminal end 1a of the base paper 1 was attached to the separator 2. It is a vertical seam (seam of paper) along the longitudinal direction of the paper, has low overall rigidity, and is often deformed during handling.Furthermore, it is difficult to automate assembly because it is poorly rounded and causes variations in outer diameter. It was hot.

In addition to the above, as shown in Figures 2 and 3,
For example, three sheets of base paper 3, 4, and 5 cut into a ribbon shape with a predetermined width dimension are wound in a spiral shape so that the seams 6 and 7 of the base paper in each layer are covered by approximately the center of the base paper in the upper layer. There is a separator 8 formed by rotating. Further, this separator 8 is bonded to half of the inner surfaces of the second layer base paper 4 and the third layer base paper 5 by applying adhesive glue.

If the separator 8 has the above configuration, the base paper 3,
The bonded portions 4 and 5 serve as circumferential joints, which have high rigidity, are difficult to deform, and do not cause variations in outer diameter, making it possible to automate assembly. However, in such a separator 8, the base paper 3, 4,
The layer is thinner in the area where No. 5 exists, and the barrier effect is weak in the thin layer area, and there is a risk of contact between the negative electrode zinc and the positive electrode mixture when installed in a dry battery, which may reduce the reliability of the product. The sex was low. In addition, the conventional separator 8 had many adhesive parts and few paper parts with good liquid absorption, and had a low electrolyte retention ability.

In view of the above-mentioned conventional problems, this invention has been made to improve and eliminate them, and provides a method for manufacturing a separator that has a uniform laminated structure throughout, has good partitioning effect, and has a high electrolyte retention capacity. This is what we provide.

Embodiments of the present invention will be described below with reference to the drawings.

4 and 5 show a separator 10 manufactured by the manufacturing method of the present invention. This separator 10 has a three-layer laminated structure in which a first base paper 11, a second base paper 12, and a third base paper 13 are wound in a manner described below. The first, second, and third base papers 11, 12, and 13 are all made of nonwoven fabric with good liquid absorption properties and cut into ribbons of a predetermined width. That is, the second base paper 12 is slightly wider than the first base paper 11, and the third base paper 13 is slightly wider than the first base paper 11.
is set to have a width that is sufficiently wider than the second base paper 12. Then, place the first base paper 11 on both side edges 1
1' and 11' are wound in a spiral shape so that they are butted against each other, and the second base paper 12 is wrapped around the first base paper 1.
In the same manner as above, both side edges 12', 1 are placed on the outer periphery of the base paper 11 with a slight shift in the longitudinal direction so as to cover the seam of the base paper 11.
The third base paper 13 is wrapped around the outer periphery of the second base paper 12, and the third base paper 13 is attached to the first base paper 11 on both sides of the third base paper 13. and the seams 15, 15 of the second base paper 12, and are spirally wound and bonded so as to overlap each other in the same state to form a cylindrical shape. Furthermore, the second
The adhesion of the base paper 12 to the first base paper 11 is as shown in FIG.
Apply adhesive glue 17 over the entire length at three points, a, 16b and central part 16c,
The adhesion of the third base paper 13 to the second base paper 12 is carried out by applying adhesive glue 19 over the entire length of the third base paper 13 at three points: both ends 18a, 18b and the central portion 18c. Also, the second base paper 1
adhesive glue 17 applied to the second and third base papers 13;
The coating width 19 is the minimum coating width necessary for adhesion to the first base paper 11 and the second base paper 12, respectively.

The separator 10 is manufactured by using a mandrel 20 formed to have a predetermined outer diameter, as shown in FIG.
The second base paper 1 is supplied from an oblique direction to the first base paper 11, and then the adhesive paste 17 is applied to a predetermined position.
2 is supplied from an oblique direction, superimposed on the first base paper 11 with a slight shift in position along the longitudinal direction of the mandrel 20, and finally a third base paper 13 is coated with adhesive glue 19 at a predetermined position. is supplied diagonally to the mandrel 20 and superimposed on the second base paper 12. In this state, the mandrel 20 is rotated and moved in the longitudinal direction. Then each base paper 11,1
2 and 13 are spirally wound along the outer periphery of the mandrel 20 in a predetermined arrangement relationship, and are formed into a cylindrical shape. Then, this cylindrical body 21 is
As shown in the figure, it is removed from the mandrel 20 and cut into predetermined dimensions to form the separator 10. Thereafter, one opening of the separator 10 is closed with paper of the same quality (not shown) to obtain a product.

In the separator 10 having the above configuration, the seams 14, 14... of the first base paper 11 and the seams 15, 15... of the second base paper 12 are arranged close to each other,
Moreover, each seam 14 on both sides of the third base paper 13,
14..., 15, 15... are covered at the same time, and in the part covering the joint, two layers overlap, and this serves as the core material of the separator 10, so that high rigidity and high roundness can be obtained. , there is no risk of deformation during handling. In addition, the separator 10 has a laminated structure of at least three layers throughout, and the seams 14, 14, 15, 15, etc. of each layer also act as a sufficient partition wall, and when installed in a dry battery, There is no possibility that the positive electrode mixture will come into contact with the fine powder of negative electrode zinc filled inside and outside the electrode. In addition, each base paper 11, 12, 1 of the separator 10
Since the bonding points No. 3 are made at three points in the width direction, there are many parts that are made of only raw material, which increases the amount of electrolyte absorption and retention capacity, and the reliability of the product is high.

Also, when manufacturing the separator 10, the second base paper 12
Also, the third base paper 13 is glued with glue 17, 19.
The strength of the parts where adhesive paste has been applied has decreased and the parts have become brittle, but there are many parts of the material that are not coated with adhesive glue 17 and 19, and the strength of the material parts is sufficient and each The base papers 12, 13 can be wound around the mandrel 20 with appropriate tension, and the cylindrical body 21 in which each base paper 11, 12, 13 is tightly wound can be obtained, and at the same time, no deformation occurs during cutting. First, it is possible to obtain a separator 10 with no variation in outer diameter.

As explained above, the present invention involves spirally winding a first base paper having an appropriate width around a mantle formed to have a predetermined outer diameter so that both side edges are butted, and then A second base paper, which is slightly wider than the first base paper, is coated with adhesive glue on the outer periphery of the first base paper over its entire length at three locations in the width direction, and then the mandrel is slightly shifted in the longitudinal direction, and then spirally shaped in the same manner as above. A third base paper that is sufficiently wider than the second base paper is wrapped around the outer periphery of the second base paper, and adhesive glue is applied to the entire length of the third base paper at three points in the width direction, and then the first base paper and Since the second base paper is spirally wound so as to cover the seam and overlap each other at both ends, it has a uniform laminated structure as a whole, has high rigidity, has a reliable partitioning effect, and has good liquid absorption. The use of this separator improves the reliability of dry battery products.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a conventional flat-wound separator, Fig. 2 is a perspective view of a conventional spiral-wound separator, Fig. 3 is an enlarged sectional view thereof, and Fig. 4 is a separator manufactured by the manufacturing method of the present invention. FIGS. 5 and 6 are enlarged sectional views of the separator, and FIGS. 7 and 8 are plan views showing part of the separator manufacturing process. 10... Separator, 11... First base paper, 1
2...Second base paper, 13...Third base paper, 14...
... Seam of the first base paper, 15... Seam of the second base paper, 17, 19... Adhesive glue.

Claims (1)

[Claims] 1. A first base paper of an appropriate width is wound in a spiral around a mandrel formed to have a predetermined outer diameter so that both side edges are butted, and then the first
A second base paper with a slightly wider width than the same base paper is applied to the outer periphery of the same base paper over the entire length at three points in the width direction, and then the mandrel is slightly shifted in the longitudinal direction and shaped in a spiral shape in the same manner as above. Then, a third base paper that is sufficiently wider than the second base paper is wrapped around the outer periphery of the second base paper, and adhesive glue is applied to the entire length of the third base paper at three points in the width direction. 1. A method for producing a separator for a dry battery, characterized in that two base papers are wound in a spiral shape so as to cover the seam and overlap each other at both ends.