JPS60181399A - Production of composite paper for glass - 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 The present invention relates to a method for producing interleaving paper that is inserted between adjacent glasses when transporting and storing glass such as laminated glass plates. The present invention relates to a method for manufacturing glass mounts using waste paper (waste paper) or waste paper and ground wood pulp as papermaking raw materials.

According to this type of glass paper manufacturing method that uses waste paper as a manufacturing raw material, the higher the proportion of waste paper used as the raw material for paper manufacturing, the lower the raw material cost and manufacturing cost can be. In order to make the paper strong and thin, the paper contains about twice as much resin as groundwood pulp. In addition to fats and oils, the higher the proportion of waste paper used, the higher the fat and oil content of the papermaking raw material.

On the other hand, as a result of conducting a test (details will be described later) to investigate the correlation between the resin content of gold paper for glass and its performance, the inventor found that (a) the resin content of glass paper (ether If the extraction amount in the extraction test (the same applies hereafter) is too large, the hygroscopicity of the mount will deteriorate and the moisture on the glass surface cannot be reliably absorbed by the interleaving paper, resulting in burnt glass. , The amount of Ω adhering to the glass surface increases due to the volatilization, elution, and transfer of the resin contained therein, resulting in paper skin adhesion to the glass.

←) By setting the resin content of the glass mount to 0.3% by weight or less, the above-mentioned burning and adhesion to the paper surface can be suppressed to an h range that does not pose a practical problem.

I discovered that.

The conventionally known method for manufacturing glass mounts is to disintegrate, remove resin and fat, and remove foreign matter from the papermaking raw materials described above, and then add an organic sizing agent such as rosin to make paper. In other words, the manufacturing method is the same as that of ordinary paper.

Therefore, when using the conventional method, it is 1M! Because we add an organic sizing agent, which is a kind of oil and fat.

Addition of this organic sizing agent increases the resin content of the mount paper, and therefore, when the resin content is less than O23% by weight, it has excellent performance in preventing glass burning and paper surface adhesion to glass. VCI''i, which manufactures laminated paper for glass, has reduced the proportion of used paper used, and has repeatedly removed resin and fat from the papermaking raw materials. Due to the addition of organic sizing agents, the resin content must be reduced to a value that does not exceed 0.0% by weight, which increases costs and complicates manufacturing operations. As a result, from the viewpoint of cost and production, the content of oak oil and fat in gold paper for glass must be about 0.36 to 96 ONM.

In view of the actual situation, the non-inventor has conducted a test and found that if paper is made without adding an organic sizing agent, even if the proportion of waste paper used is 700% by weight, the removal of resin and fat can be carried out. The inventors have discovered that the resin content of glass interleaving paper can be reduced to θ, JM amount % or less by performing the delinking oil and fat operation two times without repeating the steps many times. The aim is to build on this knowledge.

Tree oil content is 0. It is an object of the present invention to provide a method for easily and inexpensively manufacturing a glass mount that has excellent performance in preventing glass burning and paper surface adhesion to glass at a concentration of less than J% by weight.

The feature of the glass interleaving paper manufacturing method according to the present invention, which was taken to achieve the above object, is that after the papermaking raw material is defibrated, resin-removed, and foreign matter removed, paper is made without adding an organic sizing agent. At the point.

Therefore, according to the method of the present invention, the proportion of waste paper used can be increased.
And, the degreasing operation for papermaking raw materials is carried out at least 2.3 times.
While reducing costs and simplifying manufacturing operations, this glass has a 4T1 oil content of 0.3% by weight or less, and has excellent performance in preventing glass burning and paper surface adhesion. I will explain it in detail.

For the test, 8 types of interleaf papers A, B, and C below were used.

A paper: Tree oil content (ether extract content, same below).

) is /, 2% by weight of used newspaper and resin-containing waste is o, and the usage ratio of groundwood pulp is 2% by weight, to% by weight, respectively.
, 70% by weight papermaking raw material was subjected to disintegration, removal of resin and fat, and removal of foreign matter, and then an organic sizing agent was added to make paper with a resin content of 0. jwt% conventional mount.

8 paper: For the same papermaking raw material as the above-mentioned A paper,
After delinking and removing fats and oils and foreign matter, interleaf paper is produced by an uninvented method without adding any organic sizing agent, and has a resin content of θ and 0%.

C interleaving paper 2 The above-mentioned used newspaper and ground wood pulp are used as papermaking raw materials with a usage ratio of 0% by weight and 10% by weight, respectively. After disaggregation, removal of ash oil and foreign matter twice, organic size is obtained. An interleaf paper with a tree oil content of O1//heavy acid% made by an uninvented method without adding any additives.

Test method: 1 h for each of the above A, B, and C slip sheets.
Using an accelerated testing machine operated at 0°C 1r~/θ0%RH, we measured the degree of tempering of the glass, the cloudiness of the glass, which is an indicator of the adhesion of paper skin to the glass, and wiped the glass off. Afterwards, the degree of opacity was observed every 5 days until the 25th, depending on the presence or absence of clouding when the glass was sprayed with air to make it cloudy.

Regarding burnt glass, check both the areas where the mount is in contact and the areas where it is not, and check if it is cloudy or opaque.
We investigated both the cases where the surface of the mount was smooth and the case where it was rough.

Test results: The following will be explained based on FIGS. 1 to 3. In addition, each town of x, Q, and △ in Figure 1 indicates the A interleaving paper, the B interleaving paper, and the C interleaving paper, respectively.

(1) Burnt area where the interleaving paper is in contact: As shown in Figure G), in the case of A interleaf paper, the degree of burn on the 1O Nichiromu ware exceeded the allowable value for practical use. On the other hand, in the case of B interleaving paper indicated by the circle in Figure 1, although the degree of greasy baking increases on the 20th day, it remains below the allowable value until the 25th day, and in the case of C interleaving paper, No burn occurred until the 25th.

(2) Burning in h areas where the gold paper did not touch: As shown in Figure 1 (b), burns occur on all eight papers A, B, and C, but % B and C interleaf paper is more A. The degree of burning is smaller than that of interleaf paper 0 (3) White rRJ when the paper surface is smooth: @As shown in Figure 2 (a), the degree of white turbidity in the case of C interleaf paper is Although it rose to the same value as that of A paper,
Other than that, both the B and C interleaving papers have a lower degree of white turbidity than the A interleaving paper.

(4) Clouding when the paper surface is rough: As shown in Figure 2 (b), the degree of white turbidity increases in each of the 8 slip sheets as the days pass, but in B and C Ii in the case of both gold paper.

Even after 25 days had passed, the degree of white turbidity did not become any worse than the degree of white turbidity in the case of A paper.

(5) Transparency when the paper surface is smooth: As shown in FIG. 8, both interleaf papers B and C have a lower degree of opacity than interleaf paper A.

(6) Transparency when the paper surface is rough: Figure 8 (b)
As shown in , the opacity of all eight papers increases as the number of days passes, but in the case of B and C gold paper, even after -25 days have passed, the opacity of J8 paper in the case of A paper does not increase. It never exceeded my expectations.

Binding M: The resin content of the interleaving paper is less than 3% by weight, which is effective in preventing glass burning and paper surface adhesion to the glass. It was found that the gold paper could be put to practical use in terms of preventing burning and paper skin adhesion. In addition, even if the proportion of used paper is large and the resin side content is high in the case of A papermaking raw materials, the resin and fat removal operation is performed twice, and the resin and finger metal oil and fat operation of the interleaf paper is performed once. The resin content was 0. In the case of papermaking raw materials with many layers of J or more.

It has been found that it is sufficient to carry out the degreasing operation 2.3 times.

In carrying out the present invention, it goes without saying that a non-organic sizing agent such as sulfuric acid bandate may be added, and from the results of numerous tests conducted by the wood inventor, it is possible to add a large amount of sulfuric acid compound. By including it, the interleaving paper absorbs! It is known that water absorption can be improved.

[Brief explanation of the drawing]

Figure 1 9) (b), Figure 2 (a) (b), Figure 3 (a)
(b) This is a graph of I″ii test results. Agent: Osamu Kitamura, patent attorney

Claims (1)

[Scope of Claims] ■ A method for producing gold paper for glass using waste paper or waste paper and ground wood pulp as papermaking raw materials, wherein the papermaking raw materials are subjected to disintegration, removal of resin and fat, and foreign substances; 30
% or more by weight, the method for producing glass interleaving paper according to claim No. 3. (2) The method for producing interleaving paper for glass according to claim 0 or 0, wherein the resin-removal process is repeated a plurality of times.