JP2005111184A - Openable and closable container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fastener maintaining an opened state when opened, closed at the end of the operation, and excellently maintaining the shape of an opening, and a container having the fastener at the opening and maintaining the shape of the opening. <P>SOLUTION: The fastener is composed of a shape retaining material made of a thermoplastic resin and having a return angle of ≤ 30 degrees at 10 minutes after 90 degree bending. And the container has the shape retaining material made of the thermoplastic resin having a return angle of ≤ 30 degrees at 10 minutes after 90 degree bending at the opening of the fastener. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a fastener configured to be openable and closable and capable of maintaining the shape of an opening, and a container provided with the fastener.

The container is convenient when the container is opened at the time of taking in / out the object and the opened state is maintained, and the container needs to be able to be closed after the work is completed. Therefore, it is conceivable to use a plastic deformable and shape-retaining material for the opening / closing part, and a material having shape retentivity or shape retentivity can be applied to the opening / closing part of the bag-like material by highly stretching the linear body. There is a bag-like object that can be attached to hold the opening state of the opening / closing part (for example, see Patent Document 1).
JP 2003-40290 A

  The container described in Patent Document 1 proposes an excellent configuration, but it is difficult to maintain the shape, and it is desired that the container opening can be held at a practical level.

  The inventors of the present invention have intensively studied a container that has solved the above problems, and have completed the present invention. That is, the present invention is an openable / closable container having at least a pair of fastener members in the opening, and the return angle after 10 minutes has passed since the opening is bent by 90 degrees so that the shape of the opening can be maintained in the opening. Is a container provided with a thermoplastic resin shape holding material having an angle of 30 degrees or less.

  The opening / closing part closing tool of the present invention is made of a thermoplastic resin shape holding material having a return angle of 30 ° or less after 10 minutes from bending 90 °, and thus has plastic deformation and shape holding properties, Sometimes the opening state can be maintained, and the contents can be easily taken in and out. Moreover, when closed, it is possible to prevent leakage even if a filler is inserted by engaging the opening / closing part closing tool.

Thermoplastic Resin Shape-Retaining Material The thermoplastic resin shape-retaining material according to the present invention can be used as long as it has a characteristic that the return angle after 10 minutes from bending 90 degrees is 30 degrees or less. In particular, as the mechanical strength of the thermoplastic resin shape holding material, if the bending strength (ATMS D790) is 400 kg / cm ² or more, preferably 470 kg / cm ² or more, the object can be achieved with a relatively thin holding material. This is preferable because it does not easily deform against an external force without giving a sense of incongruity to the shape, and can keep the opening open. Here, in the case of a thread-like shape, the return angle is bent 90 degrees as shown in FIG. 1A and maintained for 10 minutes, and after 10 minutes have elapsed since the return angle θ shown in (b) is bent 90 degrees. Is the return angle.

  The thermoplastic resin shape retaining material may be provided anywhere as long as the shape of the opening is maintained, but is preferably near the opening of the container, particularly near the portion where the fastener member is provided. Are preferably provided in parallel. It is not always necessary to provide the entire opening, but it is preferable to provide the entire opening. There is no restriction | limiting in particular about the method provided in a container, The method of adhere | attaching by integral molding or an adhesive material may be sufficient. Alternatively, the shape retaining material made of thermoplastic resin may be used as the engaging member of the fastener as it is. For example, as shown in 3 and 4 in FIG. 2, the male part or the female part of the engaging member of the fastener, or the engaging members of the same shape can be used.

  The shape of the thermoplastic resin shape holding material is not only a circular cross section, but also a polygon such as an ellipse, a triangle, a square, a pentagon, a hexagon, a star shape, a gear shape, a saddle shape, a substantially C shape, It may be an irregular shape such as a substantially W shape, or may be a flat belt shape. When the fastener member itself is made of a thermoplastic resin shape retaining material, the shape of the fastener member or a part of the fastener member may be used. The above-mentioned Patent Document 1 shows examples of various shapes.

  As the raw material of the shape-retaining material made of thermoplastic resin, any thermoplastic resin that can be thermoformed and can be stretched and oriented can be used. Specifically, polyolefins such as polyethylene and polypropylene which are polymers or copolymers of olefins having 2 to 12 carbon atoms, diols having 2 to 12 carbon atoms and dicarboxylic acids having 2 to 12 carbon atoms, or carbon atoms having 2 to 2 carbon atoms. It may be a condensate of 12 hydroxycarboxylic acids, a co-condensate of diol, dicarboxylic acid or hydroxycarboxylic acid, or a ring-opening polymer of tactone having 2 to 12 carbon atoms. Polyesters such as polyethylene terephthalate and polylactic acid, C2-C12 diamide and C2-C12 dicarboxylic acid or C2-C12 lactam condensate, or C2-C12 lactam ring-opening polymer Polyamide such as nylon 6 is disclosed as being relatively inexpensive. Among these, polyethylene, polypropylene, polyethylene terephthalate, and polyamide are preferable because they have excellent stretchability and good shape retention. Among these, high-density polyethylene is particularly preferable because it has good shape retention, is safe for food hygiene, and is relatively easy to dispose after use. Such raw material can be appropriately selected according to the use, and can also be used by mixing. Moreover, the component derived from a natural raw material can also be mixed with this thermoplastic resin.

Method for Producing Thermoplastic Resin Shape Retaining Material The method for producing the thermoplastic resin shape retaining material according to the present invention using the thermoplastic resin is already known, and generally, the thermoplastic resin is heated. This is a method in which a raw yarn is molded by melting, and further drawn at a melting temperature or lower and a glass transition temperature or higher. What is important in the present invention is that the return angle after 10 minutes from the bending of the thermoplastic resin shape-retaining material obtained by stretching 90 degrees is 30 degrees or less. In order to satisfy such conditions, the draw ratio is relatively large, preferably about 7 to 16 times. By setting the draw ratio within the above range, a thermoplastic resin shape-retaining material can be obtained. The stretching is performed using a resin having a relatively high molecular weight, and depending on the glass transition temperature of the thermoplastic resin, it is usually stretched at a temperature lower than the melting temperature and 50 to 100 ° C. higher than the glass transition temperature. preferable. In order to enhance the stretchability, it is possible to devise a method of quenching after heating and melting and molding.

  Various additives can be blended with the thermoplastic resin, which is a raw material for the shape-retaining material made of thermoplastic resin according to the present invention, within a range that does not impair the object of the present invention. Examples of such additives include processing aids, color pigments, antistatic agents, inorganic fillers, and the like. More specifically, low molecular weight polyolefins, alicyclic polyolefins, synthetic oils having a carboxyl group or a hydroxyl group as processing aids, waxes made from vegetable oils such as mineral oils, carnauba wax, titanium oxide, zinc oxide, calcium carbide, Examples thereof include coloring pigments such as barium sulfate and silica, inorganic fillers, and antistatic agents composed of various types of surfactants. If these are waxes or antistatic agents, for example, 5 wt% or less, preferably 1 wt% or less, or if they are color pigments or inorganic fillers, for example, 10 wt% or less, preferably 5 wt%. Each can be blended at a ratio of% or less. The addition of waxes is effective to increase the dimensional accuracy in melt forming and drawing of the raw yarn, and the addition of color pigments and inorganic fillers has the effect of plastic deformation and shape retention in addition to coloring and increasing effects. May contribute to improvement.

Fasteners In the present invention, the fasteners are not particularly limited, and known ones can be used as they are. Various things are also disclosed in the above-mentioned Patent Document 1. An example of a specific shape is shown in the figure. As shown in FIG. 3, the fastener 7a and the fastener 7b can be attached to one inner surface of the bag, and the fastener 7c and the fastener 7d can be attached to the facing surface. By applying multiple rows of fasteners, it can be used as a so-called surface fastener that meshes in a wide part, and the closure of the opening and closing part is strong, so even if there is some impact, it can not be meshed, so Excellent in leakage prevention. It is also possible to use a sticky resin such as a known laminating adhesive or what is commonly called a magic tape at the opening and use it as a fastener. In addition, as a material used as a fastener structure, it is possible to use the thermoplastic resin shape retaining material itself as described above.

Constituent Materials of Container The container according to the present invention means an opening / closing part of a tent, a shielding curtain, a clean room, etc., a pocket of ONE-WAY clothes, and the like. As a material constituting the container itself, a material molded into a bag shape using the above-mentioned thermoplastic resin can be preferably used, but an inorganic material such as a metal foil, a thermoplastic resin, a thermosetting resin, etc. It may be made of organic material, natural material, paper, non-woven fabric, cloth, etc. It may be a sheet shape, a film shape, a foam, a mesh shape, a net shape, or the like, and may be a laminate of a plurality of layers or a combination of different materials.

  The container of the present invention can maintain its open state when opened, and the contents can be easily put in and taken out. When closed, the container prevents leakage even when a filling is put in, for example, by engaging an opening / closing part closure. be able to. Therefore, it is used for the use normally used as a bag or a container, such as preservation, storage, and transportation. For example, agricultural products such as cereals, foodstuffs, luxury goods, chemical products, chemicals, powders, civil engineering and building materials, pharmaceuticals, medical equipment, electrical / electrical products, mechanical parts, household / industrial / medical waste , Earth and sand, sludge, and the like, but are not limited thereto.

Hereinafter, an embodiment of the embodiment will be described. However, the present invention is not limited by these embodiments.
The thermoplastic resin filaments used in the examples were formed as follows.
<Shape retaining material made of thermoplastic resin>
High density polyethylene containing 1.2 wt% propylene as comonomer (comonomer content is measured by NMR, MFR measured by ASTM D1238 is 0.35 g / 10 min, weight average molecular weight measured by gel permeation chromatography (GPC) (Mw) and Mw / Mn calculated from the number average molecular weight (Mn) are 12, and the density measured by ASTM D1505 is 0.958 g / cm ³ ), and is subjected to melt spinning under the following conditions to obtain a raw yarn, This was stretched in the machine direction at a stretch ratio of 13 times.
Extruder: 30 mmφ (L / D = 28, compression ratio 2.3)
Die opening: 30mm x 3.6mm
Molding temperature (cylinder and die): 290 ° C
Cooling tank: 1400mm
Take-off speed: 4 m / min Drawing tank: 95 ° C. water tank (length 1700 mm)
Annealing bath: 140 ° C electric heating oven (length: 2000 mm)
Winding speed: 52 m / min The obtained thermoplastic resin filament was measured by the method shown in FIG.

Example 1
After a thickness of 0.6 mm and bending by 90 degrees by the above method, a thermoplastic resin shape-retaining material having a return angle of 12 degrees after 10 minutes has passed is obtained. As shown in FIG. Were attached to a bag 13 made of a low-density polyethylene resin film with fasteners 9 and 10. The thermoplastic resin shape retaining material 11 was sandwiched between the bag body 13 and the cover film 12 in order to be attached around the opening / closing part of the bag. The cover film 12 is made of a low-density polyethylene resin, and an adhesive is applied to a surface sandwiching the thermoplastic resin shape holding material 11. The cover film 12 is adhered to the bag body 13 by the adhesive.
The opening and closing part 16 of the obtained bag was opened in a substantially rectangular shape as shown in FIG. Since the opening / closing part 16 has a shape-retaining property, the opening / closing part was able to keep its open state as it was open while an object was put inside. After putting things in, they engaged the fasteners and closed the bag mouth. The bag was closed with fasteners, so even if it was turned upside down, the inside did not pop out.

Example 2
A thermoplastic resin shape retaining material 19 similar to that obtained in Example 1 was sandwiched between cover films 20 between opening and closing portions of a bag body 23 made of a low-density polyethylene resin film, as shown in FIG. Adhesive tapes 21 made of a hydrogenated product of styrene-butadiene block copolymer (HSBR) were affixed to the opposing inner surfaces of the opening / closing part 22 of the bag body 23.
The opening and closing part of the obtained bag was opened in an approximately square shape in the same manner as in Example 1. Since the opening / closing part has shape retention, the opening / closing part can be kept in a square open state while an object is put in the opening / closing part. After finishing putting in the bag, the bag mouth was closed with the adhesive tape 21 inside the bag. Since the bag was closed with adhesive tape, it was not leaked even if it was turned over.
After that, the opening / closing part of the bag was opened in a substantially round shape, but the opening / closing part 22 could be kept open as it was put in the bag. After filling in, the bag mouth was closed again. Since the adhesive tape 21 is made of HSBR, it has adhesive strength, and thus the adhesive strength lasts, so that it can be firmly closed even when the bag mouth is repeatedly opened and closed.

Example 3
A thermoplastic resin shape-retaining material 27 having a return angle of 12 degrees after 10 minutes had elapsed after being bent by 90 mm in thickness and 90 degrees by the above method was obtained. This was embedded in the female portion 26 of the engagement member of the fastener as shown in FIG. Further, when obtaining the raw yarn by melt extrusion molding, a thermoplastic resin shape retaining material 24 was obtained in the same manner as above except that the lip portion was made into a saddle shape, and this was used as the male portion of the engagement member of the fastener. The height direction of the saddle shape was 0.6 mm, the return angle after 10 minutes after bending 90 degrees was 15 degrees. This was adhered to the attachment member 25. Each of the obtained ones was attached to the inside of an opening / closing part of a bag 28 made of a low density polyethylene resin film.
The opening / closing part 29 of the obtained bag was opened in a substantially square shape as in Example 1. Since the opening / closing part 29 has shape retention, the opening / closing part 29 can be kept open until it has been filled. After filling in, the bag mouth was closed with adhesive tape inside the bag. The bag was closed with fasteners, so even if it was turned upside down, the inside did not pop out.

Comparative Example 1
A raw yarn was obtained by melt spinning using the same resin and the same method as in Example, and this was drawn in the machine direction at a draw ratio of 4 times. The obtained stretched product had a return angle of 37 degrees after 90 minutes of bending after being bent by 90 degrees, and could not retain the shape of the opening of the bag as it was even when adhered to the opening of the bag.

It is drawing which shows the return angle after bending 90 degree | times. It is sectional drawing of the bag with a fastener which has the male part and female part which consist of a thermoplastic resin shape holding material. It is a perspective view of the opening-and-closing part meshing tool which a meshing member consists of a substantially W-shaped thermoplastic resin shape holding material. It is sectional drawing of the bag with a fastener to which the thermoplastic resin shape holding material of Example 1 is applied. It is a perspective view which shows the state which opened the bag which applied the shape retention material made from the thermoplastic resin of Example 1 to the opening / closing part meshing tool. It is sectional drawing which shows what applied the adhesive material to the opening-and-closing part inner side of a bag with the bag which applied the thermoplastic resin shape maintenance material of Example 2 to the opening-and-closing part engaging tool. It is sectional drawing which shows the bag which applied the shape retention material made from the thermoplastic resin of Example 3 to the meshing member of the opening / closing part meshing tool.

Explanation of symbols

1, 13, 15, 23, 28 Bag body 2, 14, 16, 22, 29 Bag opening / closing part 3, 9, 24 Male part of fastener 4, 10, 26 Female part of fastener 5, 25 Mounting member 6 Fastener Main body to be attached 7a, 7b, 7c, 7d A substantially W-shaped fastener 8 Opening / closing part of the main body to which the fastener is attached 11 Thermoplastic resin shape holding material 12, 20 Cover film 17, 18 In the bag of Example 1 Attached fastener 19 Thermoplastic resin shape retaining material of Example 2 21 Adhesive tape 27 Thermoplastic resin shape retaining material of Example 3

Claims (4)

A fastener member, characterized in that the opening of the fastener member is made of a thermoplastic resin shape retaining material having a return angle of 30 degrees or less after 10 minutes from bending 90 degrees. Openable and closable container having at least a pair of fastener members in the opening, and the return angle after 10 minutes after bending 90 degrees is 30 degrees or less so that the shape of the opening can be held in the opening. A container provided with a thermoplastic resin shape holding material. A thermoplastic resin shape retaining material is provided in parallel to the fastener member.
Container as described. The fastener or container according to claim 1 or 2, wherein the thermoplastic resin shape retaining material is a stretched product having a stretch ratio of 7 to 20 times.