JPH094611A - Clip - Google Patents

Abstract

PURPOSE: To provide a clip having high sealing property with respect to all kinds of receptacles by connecting one end of a pair of arms in a turnable manner and providing an elastic member on a fitting or contacting part of at least one of the arms, while the clip body is made of a hard material. CONSTITUTION: A recessed part 2a is provided on the inner side of an arm 2 and a protrusion part 1a on the arm 1 is fitted in the recessed part 2a by turning the arm 1 with a connection part 5 as a falcrum as shown by an arrow 6. At this time, an elastic member 7 is provided on the appropriate portion of the recessed part 2a where the protrusion part 1a comes in contact with. As a result, the protrusion part 1a adheres tightly to the elastic member 7 by virtue of the elastic force of the elastic member 7 and, therefore, when an opening or the like of a plastic film made bag, for example, is sandwiched, liquid, gas, powder or the like contained in the bag never leaks out and, conversely, the contents are never exposed to the outside air due to its sufficient sandwiching force and airtightness. Thus the clip, which is serviceable for various purposes, is also suitable for airtightly sealing an opening of a bag containing, for example, liquid chemicals, food, waste fluid or the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clip, and is suitable for sealing an opening or a part of a tube of a plastic film bag for liquid or solid packaging, which is particularly used in the fields of medical treatment and food. Regarding clips.

[0002]

2. Description of the Related Art Conventionally, clips for various purposes have been devised and used in various fields such as office supplies, medical care, and foods. For example, a clip shown in FIG. 1 has been devised as a clip for sealing an opening of a plastic film bag (container) for various liquid pharmaceuticals in the medical field. As shown in the perspective view of the clip shown in FIG. 1, a pair of arms 1 and 2 are rotatable about a connecting portion 5 as a fulcrum.
Place the opening of the container such as a plastic film bag between them, rotate the arm 1 as shown by the arrow 6 to sandwich the opening of the bag, and tighten the opening of the bag with the fasteners 3 and 4. The bag is sealed. At this time, the convex portion 1a of the arm 1 is fitted into the concave portion 2a of the arm 2 to seal the opening of the bag.

However, the uneven portion 1 of the above-mentioned arm
Since a and 2a are molded from a hard material such as polypropylene resin, the sealing property of the plastic film bag is such that elasticity of an object such as a bag sandwiched between the arms 1 and 2 or the object is This is due to the mutual frictional force between the clip and the clip. Therefore, when the object is extremely thin, such as a plastic film bag, that is sandwiched by the arms, does not have elasticity, or when the mutual frictional force is inferior, the bag is clipped by the clip. The hermeticity also deteriorates. Therefore, in the conventional clip as described above, a liquid, a gas or a powder as a content is used when the application is required to have a particularly strict sealing property, for example, when the opening of a plastic film bag is sandwiched and sealed. However, there is a risk that the contents may be leaked to the outside, or conversely, the contents may be exposed to the outside air.

[0004]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a clip having a high hermeticity against various containers, and in particular, an opening of a plastic film bag or a part of a tube. It is to provide a clip that can completely seal.

[0005]

The above object can be achieved by the present invention described below. That is, according to the present invention, in a clip in which a pair of arms are rotatably connected at one end thereof and an article is sandwiched by fitting or contacting the arms, the clip body is made of a hard material, and at least one of the arms is provided. The clip is characterized in that an elastic member is provided at the fitting or contact portion.

[0006]

In the clip of the present invention, since the elastic member is provided in the fitting or contacting portion of at least one of the pair of arms, when the article is clamped by the fitting or contacting of the arms, the elastic member is not provided. The elastic force can firmly clamp the article. Therefore, for example, even when the clip of the present invention is used to seal the opening of the plastic film bag, the opening of the bag can be completely sealed by the elastic force of the elastic member.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail with reference to the preferred embodiments. FIG. 2 is a diagram showing an example of the clip of the present invention, and shows a case where the present invention is applied to the clip of FIG. In FIG. 2, reference numeral 1 is one arm that constitutes the clip body, 1a is a convex portion provided inside the arm, 2 is the other arm, and a concave portion 2a is provided inside the arm. The arm 1 is rotated around the connecting portion 5 as a fulcrum as shown by an arrow 6, and the convex portion 1a of the arm 1 is fitted into the concave portion 2a of the arm 2. At this time, the elastic member 7 is provided at the portion of the concave portion 2a with which the convex portion 1a contacts. As a result, the recess 2a
The convex portion 1a is brought into close contact with the elastic member 7 due to the elastic force of the elastic member 7 provided in the above, so that it is sufficient even when the opening of a plastic film bag is clamped by the clip having the structure. It has a strong clamping force and airtightness, and liquid, gas, powder etc. as the contents of the bag will not leak, and
On the contrary, the contents are not exposed to the outside air. Therefore, although the clip of the present invention can be used for various purposes, it is also suitable for sealing the opening of a bag containing liquid medicine, food, waste liquid, or the like.

Although FIG. 2 shows an example in which the elastic member 7 is provided at the bottom of the concave portion 2a, the concave portion 2a may be any portion that comes into contact with the convex portion 1a or the flat portion 9 beside it. The elastic member 7 may be provided at any part such as the inner side surface of the plate or the flat part 10 beside the recess 2a. Further, it is possible to provide the elastic member 7 on the contact portion on the side of the convex portion 1a and the contact portions on both the concave and convex portions 1a and 2a.

As described above, the present invention is implemented by providing the elastic member 7 on at least one of the concave and convex portions 1a and 2a in which the pair of arms 1 and 2 of the clip body shown in FIG. Although it is possible, the present invention is not limited to the clip having such a structure, and a clip having a structure in which the sandwiched portions by a pair of arms are fitted with each other or contact with each other by a line or a surface thereof, Fitting part, or
It can be implemented by providing an elastic member on at least one of the contact portions. Examples of the setting location of the elastic member include the examples shown in FIGS.
4 is a cross-sectional view showing a location where the elastic member 7 is installed on at least one of the pair of arms of the clip body.

FIG. 3 is a view for explaining the structure of a clip of another example of the present invention, which is suitable for sealing a plastic film container for sealing medicines in medicine and excrements of patients, for example. In this example, similar to the clip shown in FIG. 2, a clip in which a pair of arms 1 and 2 are connected at a connecting portion 5 is provided with an elastic member 7 at one contact portion of a portion where the arms fit together. However, the elastic member 7 itself provided in the concave portion 2a of the arm 2 has the arm 1
The structure is such that the convex portions 1a of the above are fitted. Therefore,
Similar to the clip shown in FIG. 2, it is possible to obtain a high clamping force and a high airtightness. Further, in the clip shown in this example, the arm 1 is rotated in accordance with the arrow 6 to be brought into close contact with the arm 2,
When tightened by the fasteners 3 and 4, the entire clip body is extremely thin and has a constant curved surface shape.
Even if it is used to seal a plastic film bag for an ostomy at a medical site, the appearance of clothes worn by the patient is not significantly deformed, so there is little problem in appearance.

Materials for forming the arms and the connecting portions which constitute the clip body of the present invention include plastic, iron,
Although any hard member such as aluminum or stainless steel can be used, it is particularly preferable to use hard plastic from the viewpoints of workability and economy. As the hard plastic, for example, general-purpose hard plastics such as polyethylene, polypropylene, polystyrene, polyester and polyamide can be used, and a particularly preferable hard plastic is polypropylene resin. The polypropylene resin used in the present invention is a polymer mainly composed of a polypropylene monomer and may contain a small amount of other copolymerizable olefins as a copolymerization component, and is used for various conventional fibers and various molded products. It is widely used as a raw material of, and any of these conventionally known polypropylene resins can be used as they are in the present invention.

As the elastic member used in the present invention, any elastic member such as rubber, resin and sponge can be used as long as it has a certain elasticity. From the viewpoint of frictional force and the like, it is particularly preferable to use a thermoplastic elastomer. Here, the thermoplastic elastomer is a material that has elasticity similar to that of rubber at room temperature, but softens by heating to exhibit fluidity, that is, thermoplasticity. For example, a block copolymer (EPM) of an ethylene polymer and a propylene polymer is used. ),
Polyolefin thermoplastic elastomer such as block copolymer (EPDM) of ethylene polymer, propylene polymer and diene polymer, block polymer of styrene polymer and polybutadiene (or polyisoprene) polymer, hydrogenated product of these block copolymers, polystyrene-polyethylene Polystyrene-based thermoplastic elastomer such as polybutylene-polystyrene block copolymer (SEBS), polyester-based or polyurethane-based block copolymer and the like are mentioned, and all of them are materials that can be easily obtained from the general market.

Among the above-mentioned combinations of the thermoplastic elastomer and the hard plastic, particularly preferable combinations are polypropylene resin as the hard plastic and EPM as the thermoplastic elastomer.
(For example, trade name: Toughmer PO480, manufactured by Mitsui Petrochemical), EPDM or SEBS (for example, trade name: Sumitomo T.
PE-SB series).

In the clip of the present invention, the pair of arms and the elastic member are separately manufactured, and then the elastic member is fitted into the groove provided in advance inside at least one of the arms (the closing surface). Alternatively, the elastic member may be directly attached to the arm with an adhesive or the like, but there may be a slight gap in a portion where the elastic member is fitted or a portion where the elastic member is attached. When used in the field of food and the like, it is considered that medicines, foods, and other residues may collect in the gaps, and it is preferable to integrally form the arm and the elastic member from the viewpoint of hygiene.

As a method for integrally manufacturing the clip of the present invention, conventionally known insert molding and two-color molding can be performed. As molding conditions, for example,
The conditions may be the same as those for general insert molding or two-color molding as described in "Recent Injection Molding Technology-Practice and Applications-" (Sanko Publishing Co.). When the clip of the present invention is manufactured by insert molding or two-color molding, the thermoplastic elastomer may be molded first, and then the hard plastic may be molded. However, preferably, the hard plastic is molded first and then the heat molding is performed. Mold the plastic elastomer.

In insert molding, first, a hard plastic is melt-injected and molded into a mold having a cavity having a sectional shape without the elastic member 7 in FIGS. 6A to 6F to form a pair of arms. A clip body composed of a connecting portion is molded, and the molded product is molded as shown in FIGS.
Inserted into a mold having a cavity having a cross-sectional shape of a clip body having an elastic member 7 shown in FIG. 1, and melt-injecting a thermoplastic elastomer into a space portion (a portion of the elastic member 7) of the elastic member 7 with respect to the clip body. It is preferable to integrally perform fusion molding. FIG. 6 is a diagram showing a partial cross section of an example of the integrally molded clip of the present invention.

In the case of two-color molding, for example, it is integrally molded as shown in FIG. In the example shown in FIG. 5A, the first mold 31 and the second mold 32 are detachably attached to each other at the parting line 33. The first mold 31 has a recess 34
The cavity 36 having the same shape as the outer surface of the molded product is formed by the butting of the first mold 31 and the second mold 32. The second mold 32 is provided with a resin injection port 37. In this state, as shown in FIG. 5B, molten hard plastic is injected from the injection port 37 to mold the clip body 38 in the cavity 36. After the clip body 38 is molded in this manner, the first mold 31 shown in FIGS. 5 (a) and 5 (b) is rotated to separate another mold as shown in FIGS. 5 (c) and 5 (d). The first die 31 is brought into close contact with 32 '. While the molded body made of the hard plastic is cooled and hardened to some extent during the replacement time of the second mold, the length of the replacement time of the mold does not cause any particular problem.

In the state shown in FIG. 5C, a space 39 is formed above the clip body 38 made of hard plastic, and as shown in FIG. The elastic body 41 is molded by injecting the melted material of the plastic elastomer, and the clip body 38 is formed.
And integrated. Next, the mold is cooled to a required temperature and then released from the mold, so that the elastic member 4 is attached to the upper portion of the clip body 38.
A desired molded product in which 1 is integrally molded is obtained.

The above is an example of the core rotation system, and any two-color molding system such as the core back system is also useful in the present invention. Further, in the above example, the thermoplastic elastomer is molded after molding the hard plastic, but there is no problem even if the molding order is reversed. It is particularly preferable to integrally mold the clip main body and the elastic member by insert molding or two-color molding as described above, because the manufacturing cost can be reduced and a stable quality product can be mass-produced.

[0020]

EXAMPLES Next, the present invention will be described more specifically with reference to examples. Example 1 A DC100-200 type two-color molding machine (manufactured by Nissei Plastic Industry Co., Ltd.) was used as an injection molding machine, and a polypropylene resin was melted at a temperature of 200 to 230 ° C. It was injected and injected into the temperature mold A (the combination of the first mold 31 and the second mold 32 shown in FIG. 5A). As a result, the clip body 38 made of polypropylene resin is molded.

Next, the mold 31 with the clip main body 38 still in place is rotationally moved to be moved and brought into close contact with another mold 32 'to obtain the mold B shown in FIG. 5 (c). , EPM from the injection port 40 of the mold 32 'to 180 ° C to 240 ° C
After being melted at the temperature of ## EQU1 ## and injected into the cavity 39 above the clip body 38, the elastic member 41 was integrally molded. Next, the mold B was opened after cooling so that the temperature was constant in the mold B, and a clip of the present invention having a sectional structure shown in FIG. 6 (b) was obtained.

In the plastic clip having this elastic member, the polypropylene resin portion and the EPM portion were both melt-bonded together and completely integrated, and could not be separated. Also, with the clip obtained as described above, 100 mm x 200 mm containing water
The polyethylene bag (thickness: 0.01 mm) of No. 3 was clamped and clamped. In this state, even if the polyethylene bag containing water was turned upside down and rocked up and down, liquid leakage did not occur.

Example 2 In the case of insert molding, a general injection molding machine (KC-140 type A manufactured by Kawaguchi Iron Works Co., Ltd.) was used, and the first die 31 and the second die shown in FIG. 5 (a) were used. The mold 32 is attached to form the mold A, and the polypropylene resin that is a hard plastic is
It is melted at a temperature of 0 to 250 ° C., the mold A is kept at a temperature of 50 ° C., and the injection pressure 4 is set in the cavity 36 of the mold A.
Clip body 3 by injection injection at 0-100 kg / cm ²
Form 8 When the molded product solidifies to a temperature that does not deform when taken out, the mold A is opened, the molded product is taken out of the mold A, and the molding of the clip body 38 is completed.

Then, using a general injection molding machine (KC-140 type B manufactured by Kawaguchi Iron Works Co., Ltd.), the dies 31 and 3 shown in FIG.
2'is attached to form a mold B, the molded clip body 38 is inserted into the concave portion 31 or the convex portion 32 'of the mold B, and the mold B is sealed in combination with the mold 32'. SEBS (Sumitomo TPE) 180 ° C from inlet 40
Melt at a temperature of ~ 250 ° C, injection pressure 30 ~ 80kg /
injection into the cavity 39 with a cm ²
Was molded. After the integrally molded product was solidified in the mold B, the mold B was opened and the integrally molded product was taken out to obtain a clip of the present invention having a sectional structure shown in FIG. 6 (b).

Also in this plastic clip, both were melt-bonded and completely integrated at the boundary between the polypropylene resin portion and the SEBS portion, so that they could not be peeled off. When this clip was also evaluated for hermeticity in the same manner as in Example 1, the result was good.

[0026]

As described above, according to the present invention, it is possible to provide a clip having high hermeticity. Especially medical
In the field of food and the like, when tightness is required, for example, the opening of a plastic film bag is completely sealed, and liquid, gas, powder, etc. as contents do not leak, On the contrary, it is possible to provide a clip whose contents are not exposed to the outside air. Furthermore, by integrally molding such a clip, it is hygienic even when used in the fields of medical care, food, etc., and it also reduces the manufacturing cost.
In addition, it is possible to provide a clip having excellent quality stability and mass productivity.

[Brief description of drawings]

FIG. 1 is a perspective view and a cross-sectional view showing an example of a conventional clip.

FIG. 2 is a perspective view and a sectional view for explaining a clip of the present invention.

FIG. 3 is a perspective view and a sectional view showing an embodiment of the clip of the present invention.

FIG. 4 is a cross-sectional view of a clip showing an example of how to provide an elastic member.

FIG. 5 is a diagram for explaining the clip manufacturing method of the present invention.

FIG. 6 is a cross-sectional view showing an example of the integrally molded clip of the present invention.

[Explanation of symbols]

 1,2: Arm 1a: Convex portion of arm 1 2a: Recessed portion of arm 2, 3,4: Fastener 5: Connecting portion 6: Arrow indicating clip holding state 7: Elastic member 9: Flat portion beside convex portion 10: Flat part beside the concave part 31: First mold 32: Second mold 32 ': Second separate mold 33: Parting line 34: Mold concave part 36: Cavity 37: Injection port 38: clip body 39: space 40: inlet 41: elastic member

Claims (5)

[Claims] 1. A clip in which a pair of arms are rotatably connected at one end thereof and which clamps an article by fitting or contacting the arms, the clip body is made of a hard material, and at least one of the arms is fitted. A clip characterized in that an elastic member is provided at the joint or the contact portion. 2. The clip according to claim 1, wherein the elastic member is made of a thermoplastic elastomer. 3. The clip according to claim 1, wherein the arm and the elastic member are integrally molded. 4. The clip according to claim 1, wherein the arm and the elastic member are formed by insert molding or two-color molding. 5. The arm is made of polypropylene resin,
The clip according to claim 1, wherein the elastic member is made of a thermoplastic polyolefin-based elastomer or a thermoplastic styrene-based elastomer.