JPH01292745A - Manufacture of packing for sealing cell - Google Patents

Abstract

PURPOSE:To improve punching workability by impregnating high melting-point microparaffin wax in a central part of paper to form a layer of wax wherein high melting-point microparaffin wax, polybuten and polyethylene are mixed in lamination at the outside of the central part. CONSTITUTION:Paper 1 is impregnated in bathtub 3 of molten high melting-point microparaffin wax W1 and after the end of this impregnating process, the paper 1 is impregnated in bathtub 4 of wax W2 wherein molten high melting-point microparaffin wax, polybuten and polyethylene are mixed. In a punching process after that, therefore, a punch for punching will punch through a slippery high melting-point microparaffin wax large almost all of which is impregnated in the inside of the paper. This makes it possible for the punchability to be improved and also to satisfy the requirement for a high temperature storability and also sealability due to pressure sensitive tackiness of a mixed wax on the outer surface and a low-temperature storability.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for manufacturing a battery sealing packing for airtightly sealing the sealing portion of a manganese dry battery or the like.

(Prior Art) For example, a method for manufacturing a sealing packing used for sealing the sealing part of a manganese dry battery, etc. generally involves winding up a paper material wound into a hoop shape while impregnating it in a bath of paraffin wax. After aging, it is fed out again and punched into a ring shape to produce sealed packing.

Conventionally, high melting point microparaffin wax has been used as a material to be impregnated into this paper material.

This type of wax impregnates the paper material in a short time and has a high melting point, so the wax component oozes out little when stored at a high temperature of, for example, 70°C, and the sealing performance of the sealed part is maintained.

However, paraffin wax alone is generally not flexible enough, and caulking tends to crack at some point, causing problems such as leakage from these areas or leakage due to air intrusion under overdischarge conditions. Because it is easy to use, polybutene is currently mixed with paraffin wax as a softening agent.

(Problem to be solved by the invention) However, in order to exhibit the effect of flexibility, it is not effective unless the blending ratio of the polybutene is above a certain level, and if an excessive amount of polybutene is added, adhesiveness This increased the frequency of troubles such as clogging during the punching process, causing problems in terms of workability and making it difficult to maintain the amount of polybutene added at an appropriate level.

The present invention has been made to solve the above-mentioned problems, and aims to provide a method for manufacturing a battery sealing packing that improves punching workability and has excellent leakage resistance.

(Means for Solving the Problem) In order to achieve the above object, the method for manufacturing a battery sealing packing of the present invention includes a first impregnation step in which paper material is impregnated in a bath of melted high-melting point microparaffin wax. ,
After the first impregnation step, the paper material is impregnated in a bath containing a mixture of molten high-melting point microparine wax, polybutene, and polyethylene.

(Function) A layer impregnated with high melting point microparaffin wax is formed in the center of the paper material obtained through the above manufacturing process.
On the outside, a relatively flexible and thin mixed wax layer of high melting point microvaline wax, polybutene, and polyethylene is formed in a laminated state, resulting in a three-layer structure.

Therefore, while the mixed wax layer on the surface prevents cracking during caulking, in the punching process, this mixed wax layer is relatively thin, so the punch used is a high-melting point microparaffin wax that is harder than the mixed wax layer. Since the layer is punched through, the punching process becomes easier.

(Example) Hereinafter, an example of the present invention will be described in detail using the drawings.

FIG. 1 is an explanatory diagram showing the manufacturing process of this invention.

In the figure, 1 is a paper material wound into a hoop shape around a roller 2, 3 is a first bathtub, 4 is a second bathtub, and the paper material 1 is passed through a plurality of pairs of rollers 5 for feeding and pinching. 1st. It is immersed in the second bathtubs 3 and 4, and then wound up on a winding roller 6 and stocked.

The first bath 3 is filled with 180°F microparaffin wax Wl in a molten state maintained at a temperature of 150 to 170°C.

Also, in the second bath 4, there is mixed paraffin wax W2 in a molten state, which is also maintained at a temperature of 150 to 170°C.
is filled.

Mixed paraffin wax W2 is 180@F as above.
The composition is a mixture of microparaffin wax and tackifiers polybutene and polyethylene,
The following composition ratio is desirable.

180°F Microparaffin wax 7
0(111) Polybutene 28.2 The thickness of the paper material 1 is 0.8 mm, and the immersion time in the first bathtub 3 can be set to about 5 seconds, and the immersion time in the second bathtub can be set to about 3 seconds. desirable.

The immersion time in the first bathtub 3 was set to 5 seconds because
Equivalent to the conventional one-step soaking time,
This is because if less than this time, the amount of impregnation into the fibers of the paper material 1 will be insufficient, and even if this time is exceeded, no further amount of impregnation can be expected.

Furthermore, the reason why the immersion time in the second bathtub 4 is set to 3 seconds is to set the formed thickness of the mixed wax W2 to a specific thickness, and if the thickness is less than this, the layer thickness will become too thin. , the adhesion which is an advantage of the mixed wax W2 cannot be sufficiently obtained.

Further, if the impregnation time exceeds 3 seconds, the layer thickness becomes too thick, which tends to cause clogging during the punching process.

These immersion times can be adjusted by adjusting the length of time the paper material 1 is immersed in each of the baths 3 and 4. Further, the solidification time of the microparaffin wax Wt impregnated into the paper material 1 after leaving the first bathtub 3 and reaching the second bathtub 4 is determined by the distance between the bathtubs 3 and 4.

This can be achieved by adjusting the working temperature and atmosphere.

After completing each of the above-mentioned dipping steps, the paper material 1 is wound onto the take-up roller 6, and is kept there for sufficient aging.Then, it is punched out into a ring shape in the punching step, and sealed with sealing packing. It will be completed.

FIG. 2 shows a partial cross-sectional shape of the completed ring-shaped sealing packing 10, in which the central part of the paper material 1 is impregnated with the high melting point microparaffin wax Wl over the entire thickness direction, and A thin layer of mixed wax W2 is formed on the upper and lower surfaces, resulting in a three-layer structure as a whole. Note that this cross section shows a schematic shape, and the interface between the two is not clear in reality, but at least the upper and lower surfaces of the sealing packing 10 are covered with a layer of the sticky mixed wax W2. .

Therefore, in the punching process, the direction of the punch passes through the layer of high melting point microparaffin wax W1 that occupies most of the thickness of the paper material 1, and therefore, the layer of mixed wax W2 with high adhesiveness is formed above and below it. Even if there are layers, problems such as clogging due to adhesion can be eliminated, and punching workability can be improved.

Then, as shown in FIG. 43, the sealing packing 10 described above is fixed to the sealing portion of the manganese dry battery in a caulked state.

In the figure, the sealing packing 10 is arranged around the periphery of the negative terminal plate 12 joined to the end surface of the zinc can 11.
The metal jacket 14, which covers the outer periphery of the metal jacket 1 with an insulating tube 13 interposed therebetween, is clamped and fixed to the inner periphery of the opening edge of the metal jacket 14 by caulking.

In this state, the upper and lower mixed wax layers W2 of the sealing packing 10 are pressure-sensitively adhered to the periphery of the negative terminal plate 12 and the insulating tube 13 due to the pressure of caulking, thereby ensuring sufficient sealing performance of the sealing portion. This makes it possible to prevent liquid leakage due to air intrusion under overdischarge conditions, which is required for this type of sealed packing.

In addition, since the high melting point microparaffin wax Wl impregnated inside the sealing packing 10 has a melting point of 180"F, there is no problem such as oozing of wax or leakage due to this when stored at high temperatures around 70 degrees Celsius. Of course.

(Effects of the Invention) As explained in detail in the examples above, in the method for manufacturing a battery sealing packing according to the present invention, the inside of the paper material is impregnated with a layer of high melting point microparaffin wax, and On the lower surface, a layer of mixed wax, which is a relatively flexible and thin layer made by mixing high-melting point microvaline wax and polybutene-2-polyethylene, is formed in a laminated state.

Therefore, it has a three-layer structure, and in the subsequent punching process, the punch passes through the slippery high-melting-point microparaffin wax layer impregnated inside the paper material, improving punching performance. death,
There are no frequent occurrences of problems such as clogging.

Furthermore, in addition to high-temperature storage properties due to the high-melting-point microparaffin wax, the mixed paraffin wax on the outer surface also satisfies sealing properties due to pressure-sensitive adhesive properties and low-temperature storage properties.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the manufacturing process of the present invention, Fig. 2 is a partial cross-sectional perspective view of the obtained sealing packing, and Fig. 3 is an enlarged cross-section of the main part showing the case where the enclosed packing is assembled into a manganese dry battery. It is a diagram. 1... Paper material 3... First bathtub 4...
Second bathtub 6... Winding roller 10... Sealing packing 11... Zinc can 12... Negative terminal plate 13...
・・Insulating tube 14・・Metal jacket W1・
・・High melting point micro paraffin wax W2 ・・Mixed wax

Claims (1)

[Claims] (1) A method for manufacturing a battery sealing packing which is caulked by a metal jacket through an insulating tube and is sandwiched between the metal jacket and the peripheral edge of a terminal plate to seal the gap between the two: A first impregnation step in which the paper material is impregnated in a bathtub of melting point microparaffin wax, and after the first impregnation step, the paper material is impregnated in a bathtub containing a mixture of molten high melting point microparaffin wax, polybutene, and polyethylene. A method for manufacturing a sealing packing for a battery, comprising a second impregnation step.