JPH0681704U - Cushioning fixing material for packaging - Google Patents

Abstract

(57) [Summary] [Structure] A fibrous mat 2 is formed by uniformly mixing a thermoplastic resin and a thermosetting resin into a fibrous material composed of wood fibers, other natural fibers, and synthetic fibers. (Fig. 3
(A)). The fibrous mat 2 was hot pressed to form the cushioning fixing material 1 for packaging (FIG. 3 (b)). At this time, the density of each constituent portion 1a, 1b is made higher as the constituent portion 1a, 1b is thinner, by forming an uneven shape corresponding to the shape of the material to be packed. [Effect] The thin component portion 1a has sufficient strength because the fibrous mat 2 is thermoset, while the thick component portion 1b is
Only the surface layer of the fibrous mat 2 is heat-cured, and the low density fiber material is lightly bonded to the inner layer, so that it has appropriate elasticity and excellent cushioning properties.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention mainly relates to a cushioning fixing material for packaging used in box packaging of various devices.

[0002]

[Prior art]

 When packaging equipment such as a lunch box (heat retention lunch box) in a box, in order to prevent damage to the packaged material during transportation, a loose fixing material for packaging that matches the shape of the packaged material. It is necessary to abut and to fix the material to be packed softly. Since this cushioning fixing material for packaging is often unnecessary after use, in addition to its original function of cushioning and fixing, it is required to be inexpensive and easy to dispose of. Conventionally, corrugated cardboard works, synthetic resin sheets, and foamable synthetic resin molded products have been widely used as the cushioning fixing material for packaging.

[0003]

[Problems to be solved by the device]

 However, the corrugated cardboard work is relatively inexpensive, but it lacks strength and shock-absorbing properties, and cannot be used when the material to be packed has a complicated shape.

On the other hand, a synthetic resin sheet or a molded product of a foamable synthetic resin is an excellent material in terms of function, but since the density is uniform, the thin portion becomes a weak point in strength, and the waste is discarded. Has become a problem with recycling by collection.

As a cushioning fixing material for packaging that solves these drawbacks, a molded product called pulp mold using waste paper has been put into practical use, but its molding cost is high and its use is limited. The current situation is that there is a problem.

In view of the above circumstances, the present invention uses inexpensively obtained wood fiber or recycled fiber as a main raw material, and mixes a small amount of synthetic resin with this to manufacture a fibrous mat. It is an object of the present invention to provide a cushioning fixing material for packaging which is not only functionally excellent by being compression-molded, but also inexpensive and easy to dispose of at the same time.

[0007]

[Means for Solving the Problems]

 That is, the present invention provides a fibrous mat (2) by uniformly mixing a thermoplastic resin and a thermosetting resin into a fibrous material composed of wood fibers and natural fibers and / or synthetic fibers other than wood fibers. In the cushioning fixing material for packaging (1) formed by hot pressing the fibrous mat, the component parts (1a, 1b) are formed in an uneven shape corresponding to the shape of the material to be packed (3). The density is increased as the component is thinner.

The numbers in parentheses are for convenience of showing corresponding elements in the drawings, and the present invention is not limited to the description in the drawings. The same applies to the "Claims for utility model registration" and "Action" columns.

[0009]

[Action]

 According to the present invention, since the fibrous mat (2) in the thin component (1a) is thermoset and has a high density in the thin component (1a), the strength is sufficient and the fixing property is excellent, while the thick component (1) is In 1b), only the surface layer part of the fibrous mat is thermoset, and the inner layer part has a moderate elasticity because the low-density fiber material is lightly bonded through the thermoplastic resin and the thermosetting resin. And acts to have excellent buffering properties.

[0010]

【Example】

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

FIG. 1 is a perspective view showing an embodiment of a cushioning fixing material for packaging according to the present invention, and FIG. 2 is a sectional view showing a manufacturing process of the cushioning fixing material for packaging shown in FIG. Is a diagram showing a state before compression molding of the fibrous mat, (b) is a diagram showing a state after compression molding of the fibrous mat, and FIG. 3 is an enlarged sectional view of the fibrous mat shown in FIG. FIG. 4A is a diagram showing a state before compression molding, FIG. 4B is a diagram showing a state after compression molding, FIG. 4 is a perspective view showing an example of devices (lunch box) that are materials to be packed, and FIG. 4 is a cross-sectional view showing a state in which the cushioning fixing material for packaging shown in FIG. 1 is attached to the devices shown in FIG.

As shown in FIGS. 1 and 5, the packaging cushioning fixing material 1 according to the present invention has a shape of a device 3 (see FIG. 4) such as a lunch box (heat retention lunch box) which is a material to be packed. It has a combined predetermined concavo-convex shape, and three kinds of fibers (wood fiber, natural fiber and synthetic fiber) are bonded to each other by a thermoplastic resin and a thermosetting resin. ), The density of the fibers varies in inverse proportion to the thickness of each component. That is, the thin component portion 1a is dense and the thick component portion 1b is rough.

The manufacturing procedure of the cushioning fixing material 1 for packaging according to the present invention is as follows.

That is, as shown in FIG. 2, a male die 5 having an uneven surface 5a corresponding to the shape of the equipment 3 is provided on the upper board 7a, and a female die 6 having a flat surface 6a is provided on the lower board 7b. The fibrous mat 2 is set on the hot press plate 7 (see FIG. 2 (a) and FIG. 3 (a)), and compression molding is performed for 60 seconds at a mold temperature of 200 ° C. and a surface pressure of 15 kg / cm ² (see FIG. 2 (b) and FIG. 3 (b)).

Here, the fibrous mat 2 means a bulk specific gravity of about 0.05 to 0.1 g / cm ³ and a bulk height of about 25 to 35 mm, which is generally used in molding a core material for an automobile interior material. It is a mat. That is, a fiber material consisting of wood fibers, natural fibers such as hemp and cotton, and synthetic fibers is uniformly mixed with a thermoplastic resin such as polyethylene and a thermosetting resin such as phenol resin (the mixing ratio is For example, 85% of wood fiber, 2% of natural fiber, 3% of synthetic fiber, 3% of thermoplastic resin and 7% of thermosetting resin), and a mixture thereof is manufactured into a mat by a forming device. As the above-mentioned fibrous material, natural fibers mainly composed of wood fibers which have been defibrated by a conventional method to cut wood chips such as conifers and hardwoods commonly used as raw materials for fiberboard, and have a water content of about 25% or less. A mixture of synthetic fibers such as polyester and a suitable amount is used, and as the natural fibers, fibers having a long fiber length such as hemp and cotton may be mixed. In addition, fluff containing cotton or synthetic fiber may be used to reduce cost.

As the thermoplastic resin, polyester resin, polypropylene resin, polyethylene resin, ethylene vinyl acetate resin, vinyl acetate resin, latex and the like can be mentioned. On the other hand, as the thermosetting resin, phenol resin, melamine resin and the like are used. It should be noted that these resins are added in the form of powder, liquid or the like (in the case of a thermoplastic resin, it may be fibrous).

Regarding molding conditions, the temperature of the male mold 5 and the female mold 6 is preferably a temperature at which the thermoplastic resin is cured in a short time, specifically about 180 to 220 ° C. Moreover, the compression is preferably a pressure at which the density of the thin component portion 1a of the molded cushioning fixing material 1 for packaging is formed to be about 1 g / cm ³ , specifically, 15 to 20 kg / cm ² . The pressure may be selected according to the thickness of the fibrous mat 2 and the steps between the irregularities.

Since the cushioning fixing material 1 for packaging according to the present invention has the above-mentioned structure, in the thin component portion 1a, since the fibrous mat 2 is thermoset and has a high density, the strength is sufficient (thin configuration Although the portion 1a emits substantially the same strength as the thick constituent portion 1b in spite of being thin, and has excellent fixability, the thin constituent portion 1a does not cause a weak point in strength. The thickness of the thin component portion 1a needs to be at least about 1 mm or more. This is because when molding the fibrous mat 2, if the density of the molded product exceeds 1 g / cm ³ , delamination called puncture tends to occur, so the density of the most compressed part should be within 1 g / cm ³ . It is desirable to hold it down. In this case, the thickness needs to be about 1 mm or more in terms of strength.

On the other hand, in the thick component portion 1b, only the surface layer portion of the fibrous mat 2 is thermoset, and in the inner layer portion, a low-density fiber material is lightly bonded through a thermoplastic resin or a thermosetting resin. Therefore, it has appropriate elasticity and excellent cushioning properties. It should be noted that the thick component portion 1b needs to have a buffering property such that it is not easily crushed when an object is bumped after it is packaged. The density is 0. 1g / cm ³ or more is required.

Further, since the cushioning fixing material 1 for packaging has a flat surface on one side (lower surface in FIG. 3), it has a good fit and is stable when mounted on the material 3 to be packed and stored in a cardboard box or the like. It has high quality.

In the above embodiment, the case where the cushioning fixing material 1 for packaging is formed from one fibrous mat 2 by thermocompression is described, but a plurality of fibrous mats 2 are formed by thermocompression. It is also possible to obtain the cushioning fixing material 1 for packaging. In this case, the fibrous mats 2 are adhered to each other at the time of hot pressing to be integrated.

[0022]

[Effect of device]

 As described above, according to the present invention, a fiber material composed of wood fibers and natural fibers and / or synthetic fibers other than wood fibers is uniformly mixed with a thermoplastic resin and a thermosetting resin to form fibers. In the cushioning fixing material 1 for packaging, which is formed by forming the quality mat 2 and hot pressing the fibrous mat 2, each component part is formed into an uneven shape corresponding to the shape of the material to be packed such as the equipment 3 or the like. Since the density of 1a, 1b is increased as the constituent parts 1a, 1b are thinner, the fibrous mat 2 is thermoset and has a high density in the thin constituent parts 1a. On the other hand, in the thick component portion 1b, only the surface layer portion of the fibrous mat 2 is thermoset, and the low density fiber material is lightly bonded to the inner layer portion through the thermoplastic resin or the thermosetting resin. Has moderate elasticity and excellent cushioning It from functionally superior can provide cushioning, anchoring member 1.

Further, since the raw material is mainly wood fiber or other natural fiber, it is inexpensive and can be easily disposed of.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a cushioning fixing material for packaging according to the present invention.

2A and 2B are cross-sectional views showing a manufacturing process of the cushioning fixing material for packaging shown in FIG. 1, in which FIG. 2A shows a state before compression molding of a fibrous mat, and FIG. 2B shows compression of the fibrous mat. It is a figure which shows the state after shaping | molding.

3 is an enlarged cross-sectional view of the fibrous mat shown in FIG.
(A) is a figure which shows the state before compression molding, (b) is a figure which shows the state after compression molding.

FIG. 4 is a perspective view showing an example of devices (lunch box) that are materials to be packed.

5 is a cross-sectional view showing a state in which the packaging cushioning fixing material shown in FIG. 1 is attached to the devices shown in FIG.

[Explanation of symbols]

 1 ... Cushioning fixing material for packaging 1a ... Thin component 1b ... Thick component 2 ... Fibrous mat 3 ... Packaged materials (equipment)

Continuation of the front page (72) Minoru Kinan 3-8-4 Nihonbashihonmachi, Chuo-ku, Tokyo Mitsui Wood Industry Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A fibrous mat (2) is formed by uniformly mixing a thermoplastic resin and a thermosetting resin into a fiber material composed of wood fibers and natural fibers and / or synthetic fibers other than wood fibers. In the cushioning fixing material (1) for packaging formed by hot-pressing the fibrous mat, the density of each constituent part (1a, 1b) is formed by forming an uneven shape corresponding to the shape of the material to be packed (3). A cushioning fixing material for packaging, characterized in that the thinner the component is, the higher it is.