JP2003206073A - Reel cardboard - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lightweight reel cardboard having sufficient strength as a reel cardboard, suppliable at a low cost, easy in disposal treatment and recyclable because of being made of paper. <P>SOLUTION: This reel cardboard is a multi-ply board having a 700 g or less basic weight and a 0.75 mm or more thickness. The cardboard is characterized by manufacturing its surface layer by using only chemical pulp prepared by mixing at least 20% of conifer-based chemical pulp, or pulp prepared by including mechanical pulp and/or one or more kinds of used-paper pulp in it, and by being manufactured by using a paper board with its weight ratio of the surface layer to the entire layer set to 10% or above. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reel mount, and more particularly to a reel mount arranged on both sides of a reel core for supporting various tapes, films, threads, electric wires, etc. It is about.

[0002]

2. Description of the Related Art Carrier tapes and other tapes, films, etc. used in semiconductor chip manufacturing processes.
Long and flexible materials such as threads and electric wires are often shipped wound on a reel core. In that case, depending on the nature of the material, the winding side surface may be easily damaged, and the material may be scratched or the winding state itself may collapse.To prevent this, the reel bases should be placed on both sides of the reel core. Is fixed, so that the winding side surface is supported and protected.

[0003] As the reel base, generally used is a polycarbonate or other plastic or aluminum or other metal.

However, when the winding material is the raw material in the manufacturing process of a certain product like the carrier tape and is used in one way, the used reel stand or reel core is Accumulated in the manufacturing plant of the product. Of course, depending on the winding material, the used reel stand and reel core can be reused (in particular, metal ones are often used for reuse), but many are not reused. Since the reel base and the reel core are accumulated in a bulky state and temporarily stored, there is a risk that not only will they be a hindrance but also a pollution problem upon disposal.

Metal reel stands are often reused because of their robustness, but they are expensive. Further, the plastic reel stand used for the one-way is robust and has no distortion and is less likely to be dimensionally deformed, but it has a problem in disposal and a big problem that it is difficult to recycle.

In consideration of recycling, the reel base may be made of paper, but in that case, it has not been put to practical use because of the following problems. (1) Paperboard is used as a material, but with existing paperboard,
There is no one with sufficient strength required as a reel stand. (2) Since the paperboard is susceptible to dimensional changes, ruled lines 1 are inserted for the purpose of alleviating the dimensional changes and preventing warping (see FIG. 1). The ruled line 1 serves to disperse the internal stress, but a ruled line crack 2 (a broken line generated from the ruled line) is easily generated from the ruled line. (3) Paperboard easily generates paper dust, and this paper dust may become an obstacle during the post-processing step of the wound material.

[0007]

The conventional reel stand has the following problems.
Since there are many problems as described above, the present invention does not have such problems, that is, it has sufficient strength as a reel mount, is lightweight, can be supplied at low cost, and is discarded because it is made of paper. It is an object to provide a reel mount that is easy to process and can be recycled.

[0008]

In order to solve the above-mentioned problems, the inventors of the present invention selected, from the existing paperboards, the one that is closest to the required characteristics of the reel mount, and based on this, The present invention has been completed by taking measures against crease breaking and taking measures against dimensional change and paper dust. A reel mount according to the present invention for solving the above problems has a basis weight of 700 g or less and a thickness of A multi-layer paperboard having a thickness of 0.75 mm or more, the surface layer of which is composed of only chemical pulp containing at least 20% of softwood chemical pulp, or one or several types of mechanical pulp and / or waste paper pulp. Characterized in that the pulp is used in a range that does not cause a decrease in strength and the like, and is manufactured by using paperboard having a weight ratio of the surface layer to all layers of 10% or more. Is shall.

Preferably, the beating surface pulp of the paperboard has a beating freeness of 500 ml or more and a reel water content of 8.0.
± 0.5% and the folding strength measured by a folding strength tester is 5
0 times or more. In addition, it is assumed that the paperboard is coated with starch, PAM, PVA, or other surface sizing agent mixed in the paper drying step or after the drying step.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a reel mount according to the present invention in which ruled lines 1 are appropriately inserted. It employs paperboard and adds improvements to address the above-mentioned crease breaks, dimensional changes and paper dust problems. The ruled line 1 is shown as a thin line in the figure, but is actually a shallow groove. In addition, although the ruled line crack 2 is shown in the drawing, this is described in order to help understanding of the ruled line crack and is not generated in the reel mount according to the present invention.

First, in order to prevent crease cracking, it is necessary to strengthen the strength and tenacity of the surface layer. For this reason, in the present invention, the purpose of increasing the thickness of the paperboard is the first, and therefore mechanical pulp or waste paper is used. A softwood system that is particularly effective in improving strength, using only chemical pulp instead of pulp or a mixture ratio of chemical pulp to both pulp of 4: 6, or reducing the ratio of mechanical pulp and / or waste paper pulp. It was decided to mix at least 20% of the chemical pulp.

Further, in order to secure the strength characteristics as a reel mount, the conventional surface layer is for cosmetic purposes only and the ratio of the surface layer basis weight to the basis weight of all the layers of the paper is 8% in order to secure the strength characteristics as the reel mount. It was increased to 10% or more, preferably 11%.

Thus, 20 softwood-based chemical pulps are used.
% Or more, or a chemical pulp containing one or several types of mechanical pulp and / or waste paper pulp, and by increasing the basis weight of the surface layer to produce paper, We tried to increase. In addition,
The blending ratio in the case of blending the mechanical pulp and / or the waste paper pulp is within a range in which the strength of the paper intended in the present invention is secured, and specifically, it is usually 10% of the total pulp amount.
Below.

As described above, a large amount of long fiber pulp is used in order to prevent the creases from being broken, but it is not possible to predict whether creases will occur in a general paper test. Therefore, in the present invention, in order to predict whether crease cracks will occur, a fold strength test by a fold strength tester is adopted, and a value capable of preventing this crease crack is defined as the fold strength. The width was set to 50 times or more.

Next, as a measure for improving the suitability for ruled line processing and suppressing the dimensional change, the beating freeness of the surface layer pulp is changed to 500 ml or more, and distortion is caused by constraining the constituent fibers to each other. Prevented from accumulating. Also, the reel water content is 7.0 ± 0.3%.
Was changed to 8.0 ± 0.5%. As a result, the occurrence of cracks when a ruled line was inserted was alleviated, and at the same time, dimensional changes were suppressed.

Here, the reel moisture is the actual moisture value in the process (in the poplar), which is referred to as 8.
The reason for setting 0 ± 0.5% is that if the reel water content is less than this, cracks tend to occur when a ruled line is inserted,
On the contrary, if it is more than this range, the expansion and contraction of the paper becomes large.
In the product of the present invention, by setting the reel water content to 8.0 ± 0.5%, it became possible to simultaneously minimize the problems of cracking and dimensional change.

In the application of PVA by a calender roll that is generally performed, there is a limit to the absorption of PVA, and the fluffing of fine fibers on the back surface, which is the source of paper dust, cannot be suppressed. Therefore, in the present invention, PVA is used as a measure against this paper dust.
Drastically increase the application amount of
Instead of coating with a calendar roll, coating with a size press was used.

That is, the surface treatment liquid is generally of a calendar type, but since the reel mount according to the present invention contains a large amount of waste paper pulp, fine fibers on the back surface fall off to generate paper dust. I'm afraid. For example, the generation of paper dust is particularly important from the use as a carrier tape reel mount for storing parts of precision equipment. Therefore, if PVA coating with a calendar is used, PVA by roll nip
Has a limited absorption, and it is difficult to completely suppress the fluffing of the fine fibers on the back surface.

Therefore, in the present invention, the PVA is applied by a size press in order to improve the absorption of PVA and prevent the fine fibers on the back surface from fluffing and falling off.
As a result, the absorption and permeability of PVA was improved, and it became possible to prevent the generation of paper dust during processing such as punching.

The following table is a comparison table between the above-described existing cardboard manufacturing method and the reel mount manufacturing method according to the present invention.

Further, the following table is a comparison table of measured values of physical properties and the like of one embodiment of the present invention and existing cardboard.

Since the back layer is a portion hidden inside the paper, the recycled raw paper pulp may be the only raw material in consideration of recyclability and cost. Also,
In the present invention, in order to maintain a certain thickness (0.8 mm or more), the use of all six calender rolls was reduced to six, and the number of stages was reduced.

The reel mount produced by the above method comprises only chemical pulp containing 20% or more of softwood chemical pulp, or chemical pulp containing one or several types of mechanical, pulp and / or waste paper pulp. Used,
In addition, by making paper by increasing the basis weight of the surface layer,
It was confirmed that sufficient surface layer strength was imparted, and as a result, creases were less likely to occur. It was also confirmed that the change in beating freeness suppresses the dimensional change, and that the size press coating reduces the generation of paper dust.

[0024]

As described above, the present invention has sufficient strength as a reel mount, is lightweight and can be supplied at low cost, and because it is made of paper, it can be easily disposed of and recycled. It is possible to provide a simple reel mount, and this reel mount has an effect that problems such as ruled line breakage, dimensional change, and paper dust do not occur.

[Brief description of drawings]

FIG. 1 is a diagram showing a reel mount according to the present invention with ruled lines.

[Explanation of symbols]

1 ruled line 2 Ruled line crack

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Claims (7)

[Claims] 1. A multilayer paperboard having a basis weight of 700 g or less and a thickness of 0.75 mm or more, the surface layer of which is
A reel mount characterized in that it is made from a chemical pulp containing at least 20% of a softwood chemical pulp, and is made from a paperboard having a weight ratio of the surface layer to all layers of 10% or more. 2. The method of claim 1, wherein only the chemical pulp containing at least 20% of the softwood chemical pulp is used.
Reel mount described in. 3. At least 2 of the softwood chemical pulp
Chemical pulp containing 0% is mixed with one or several types of mechanical pulp and / or various types of mechanical pulp within a range that does not cause a decrease in strength and the like.
Alternatively, the reel mount according to claim 1, which contains waste paper pulp. 4. The reel mount according to claim 1, wherein the beating freeness of the surface pulp of the paperboard is 500 ml or more. 5. The reel moisture of the paperboard is 8.0 ± 0.5.
% Of the reel mount according to any one of claims 1 to 4. 6. The reel mount according to claim 1, wherein a folding endurance tester for the paperboard has a folding endurance of 50 times or more in a horizontal direction. 7. The reel mount according to claim 1, wherein the paperboard is coated with starch, PAM, or PVA during or after the paper drying step.