JPH09183429A - Oilproof and waterproof simple food container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve oilproofness and waterproofness while suppressing an amount of used additive for increasing oilproofness and waterproofness such as a fluororesin by using kenaf stalk pulp as a raw material for molding. SOLUTION: This container is integrally formed by molding with only kenaf stalk pulp used as material pulp. That is, a paper-making cup 11 having an appropriate capacity according to specifications for a product to be made is selected, and material liquid M mainly containing the kenaf stalk pulp as a raw material is thrown in. Then liquid component L is discharged by suction or the like from a liquid drawing hole 12a of a supporter 12 at a lower end of the paper-making cup 11. Thus pulp fiber 13 of the kenaf stalk pulp is left on a carrier net 13 for forming a web-like layer having a certain thickness. Thus a base material 2 of predetermined shape is formed on the carrier net 3. This base material 2 is sent to a drying process, and after it is dried, an appropriate external additive is applied. An additive such as a fluororesin may be internally added to the material liquid M.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simple molded paper container which is not repeatedly used after washing such as a food container for distribution of food and a disposable food container carried on a picnic. The present invention relates to a structure for improving oil resistance and water resistance.

[0002]

Background of the Invention Conventionally, many food distribution containers packed for display and distribution of fish, meat, side dishes, etc. in retail stores such as supermarkets, and simple food containers for disposables used at picnics, parties, etc. Is made from Styrofoam and various synthetic resin films. However, such styrofoam and various synthetic resin films cannot be recycled and are discarded as waste after use, and there is a problem that the incinerator is damaged when incinerated.

[0003] Therefore, a food container made of paper that can be recycled as waste paper has been reviewed, and the applicant of the present invention has found that the oil container has a high degree of freedom in its shape, and it is a container made of molded paper, but it has oil resistance, water resistance and strength. Disclosed or filed a food container rich in properties in Japanese Patent Application Laid-Open Nos. 7-137726, 7-137727, 6-312709, 6-248745, 6-31710, etc. It extends to. According to these food containers, the occurrence of cracks in the container due to the penetration and freezing of water in the food in the distribution container, and the container resulting from the absorption of oil and water in the simple food container for disposal It is possible to solve the problem of preventing the softening and the collapse of the shape of the.

However, all of these are mainly for improving additives such as internal additives and external additives. As for the pulp as the main raw material, for example, LBKP (hardwood pulp) and NBKP (softwood pulp) are used as before. ) And the like are used alone or in various proportions. Therefore, in order to enhance the oil resistance and water resistance as described above, it is necessary to increase the amount of the additive.
Fluororesin, which has an extremely excellent effect on water resistance, is somewhat expensive for use in such disposable food containers, and there is a problem in that the product cost is increased.

[0005]

SUMMARY OF THE INVENTION The present invention has been made from such a background, and in the molded pulp molding container, while suppressing the use amount of additives such as fluororesin which increase oil resistance and water resistance, This is an attempt to develop a new oil- and water-resistant simple food container that is excellent in oil and water resistance and has a low manufacturing cost.

[0006]

That is, the oil-resistant and water-resistant simple food container according to claim 1 is characterized by being molded using kenaf whole stem pulp as a raw material. According to this invention, since the kenaf whole stem pulp is excellent in oil repellency and water repellency, it is possible to use a small amount of a water / oil resistant additive. Even when the oil- and water-resistant simple food container of the present invention is used as a food container for distribution, water penetrates into the pulp fiber and is frozen, whereby the water freezes and the volume increases, and the container It does not cause cracks and does not lose its shape. Even when it is used in a food container for disposables, it does not permeate oil or water, and the shape or shape of water does not leak.

The oil- and water-resistant simple food container according to claim 2 is characterized in that it is molded by using only kenaf whole stem pulp as a raw material. Therefore, the product cost can be reduced. According to the invention,
Since kenaf whole stem pulp is excellent in oil repellency and water repellency, additives are not required or can be significantly reduced. Even when the oil- and water-resistant simple food container of the present invention is used as a food container for distribution, water penetrates into the pulp fiber and is frozen, whereby the water freezes and the volume increases, and the container Does not cause cracks in the
The shape does not collapse. Even when it is used in a food container for disposables, it does not permeate oil or water, and the shape or shape of water does not leak.

Further, the oil-resistant and water-resistant simple food container according to claim 3 is characterized in that, in addition to the above requirements, a fluororesin is internally or externally added. According to the present invention, since the kenaf whole stem pulp is excellent in oil repellency and water repellency, it is possible to greatly reduce the use of the fluororesin as an additive, which was somewhat expensive for a disposable food container. In addition, it is possible to keep manufacturing costs low while obtaining reliable oil and water resistance.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiment. FIG. 1 shows an oil- and water-resistant simple food container 1 of the present invention, which is used, for example, as a lunch box for distribution. This product is integrally formed by molding using only kenaf whole stem pulp as the raw material pulp. Unlike press molding, it has a degree of freedom in shape because it is molded, and a plurality of partitions 1a are provided on the inner surface side. It's different. In addition, the internal structure is characterized in that the fluorocarbon resin is used as the raw material liquid during molding, for example, LBKP (hardwood pulp) is used as the conventional pulp.
A very small amount is internally added as compared with the case of using.
An additive such as paraffin wax mixed with a small amount of microwax may be externally added to the inner surface of the molded article. In this specification, mixing an additive into a raw material liquid for molding is defined as internal addition, and applying or impregnating the molded product with the additive is defined as external addition. .
Further, in addition to the internal or external addition of the additives as described above, the applicant has added internal or external addition of high beating pulp fibers as already shown in Japanese Patent Application No. 6-248745. May be. In addition to using only kenaf whole stem pulp as the raw material pulp, for example, 20% LBKP is mixed with 80% kenaf whole stem pulp, or kenaf whole stem pulp 5
It can be formed by blending an appropriate ratio of pulp with kenaf whole stem pulp, such as blending 0% to LBKP 50%.

The present invention is constructed as described above, and when it is used, an additive such as a fluororesin is added to the conventional LBK.
Compared with the case where P is used as the main raw material, the oil repellency and water repellency are high, although the use is greatly reduced. This is because kenaf whole stem pulp is inherently oil resistant. Table 1 shows data of the oil permeation test of a molded product obtained by molding kenaf whole stem pulp and LBKP under the same conditions.

[0011]

[Table 1]

As is clear from Table 1 above, the molded product molded with kenaf whole stem pulp has an oil permeability (second).
Is slow, for example, 7 when csf (freeness) is 300
The time is 4.6 seconds, which is four times as long as the LBKP or more. Therefore, even when the oil- and water-resistant simple food container 1 of the present invention is used as a food container for distribution, water and oil permeate into the pulp fiber 3 and are frozen, whereby the water and oil are frozen. The volume increases, the container does not crack, and the shape does not collapse. Even when it is used in a food container for disposables, it does not permeate oil or water, and the shape or shape of water does not leak.

An example of a method of manufacturing the oil-resistant and water-resistant simple food container 1 as described above will be schematically described below.
Of course, in addition to the manufacturing method described below, LBKP
Various conventionally known or later-developed mold forming methods used for other pulps such as the above can be appropriately applied. 2 shows a papermaking apparatus 10, and numeral 11 denotes a papermaking cup, which is a main member of the papermaking apparatus, in which papermaking of the base material 2 is performed. The papermaking cup 11 has an appropriate volume selected according to the specifications of the papermaking product, and the raw material liquid M is charged therein. A pipe is connected to the lower end of this component, and the liquid component L is removed by an appropriate suction device connected to the pipe or by natural flow.
Is discharged. The papermaking cup 11 has a supporter 12 having a large number of liquid drain holes 12a at the bottom thereof. This has substantially the same shape as the carrier net 13 which is the type of the base material 2, and the carrier net 13 is held on the supporter 12.

In order to obtain the base material 2 by using such a papermaking apparatus 10, first, as a raw material, kenaf whole stem pulp is used as a main raw material. Then, a predetermined amount of a raw material liquid M in which a fluororesin and other appropriate additives 4 are internally added to the dispersion liquid of the kenaf whole stem pulp is put into a papermaking cup 11. When the fluororesin is internally added, for example, a cationic polymer that is a fixing agent for fixing the fluororesin is first mixed, and then a phosphoric ester-based fluororesin is mixed. The pulp fibers 3 of the kenaf whole stalk pulp in the raw material liquid M charged in the papermaking cup 11 are extracted on the carrier net 13 to form a web-like layer having a certain thickness, and the liquid component L is contained in the carrier net 13. It passes through the eye and the drain hole 12a and flows further downward. At this time, the extraction speed can be increased by performing forced suction from below. When the flow-down of the liquid component L is completed in this way, the base material 2 which is a solid component of a predetermined shape remains on the carrier net 13, and this is transferred to the drying step at this position or by a transfer device (not shown), and appropriately. 1 is subjected to a drying treatment by the means described above, and further various external additives are appropriately applied to the surface thereof to provide an oil- and water-resistant simple food container 1
You get

[0015]

The oil- and water-resistant simple food container according to claim 1 is molded using kenaf whole stem pulp as a raw material. For this reason, kenaf whole stem pulp has excellent oil repellency and water repellency, and a small amount of water / oil resistant additive can be used. Therefore, the product cost can be reduced. Even when the oil-resistant and water-resistant simple food container 1 of the present invention is used as a food container for distribution, water penetrates into the pulp fiber 3 and is frozen, whereby the water freezes and its volume increases. ,
The container does not crack and the shape does not collapse. Even when it is used in a food container for disposables, it does not permeate oil or water, and the shape or shape of water does not leak.

The oil-resistant and water-resistant simple food container according to claim 2 is molded using only kenaf whole stem pulp as a raw material. For this reason, since the kenaf whole stem pulp has excellent oil repellency and water repellency, an additive is not necessary or can be significantly reduced. Therefore, the product cost can be reduced. The oil- and water-resistant simple food container 1 of the present invention
Even when used as a food container for distribution, water content etc.
As the water permeates inside and is frozen, the water freezes and the volume increases, and the container does not crack and the shape does not collapse. Even when it is used in a food container for disposables, it does not permeate oil or water, and the shape or shape of water does not leak.

Further, in the oil-resistant and water-resistant simple food container according to claim 3, a fluororesin is internally or externally added. For this reason, kenaf whole stem pulp is extremely excellent in oil repellency and water repellency in addition to the oil repellency and water repellency as well as the oil repellency and water repellency of the fluororesin. Further, since kenaf whole stem pulp has excellent oil repellency and water repellency, it is possible to greatly reduce the use of fluororesin as an additive, which was somewhat expensive for a disposable food container. In addition, it is possible to keep manufacturing costs low while obtaining reliable oil and water resistance.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of an oil-resistant and water-resistant simple food container of the present invention.

FIG. 2 is a front cross-sectional view showing a state where the oil-resistant and water-resistant simple food container of the present invention is manufactured using a papermaking apparatus.

[Explanation of symbols]

 1 Oil-Resistant and Water-Resistant Simple Food Container 1a Partition 2 Base Material 3 Pulp Fiber 4 Additive 10 Paper Making Machine 11 Paper Making Cup 12 Supporter 12a Liquid Draining Hole 13 Carrier Net L Liquid Component M Raw Material Liquid

Claims (3)

[Claims] 1. A simple food container for oil and water resistance, which is molded using kenaf whole stem pulp as a raw material. 2. An oil- and water-resistant simple food container which is molded using only kenaf whole stem pulp as a raw material. 3. The oil-resistant and water-resistant simple food container according to claim 1 or 2, wherein the fluororesin is internally or externally added.