JPH0355062A - Mold and method for preparing medical bag - Google Patents

Abstract

PURPOSE:To prevent the generation of burr when a liquid entrance and exit tube is thermally fused to a bag by forming at least one continuous spiral groove to a recessed heating surface and positioning the end communicating with the interior of the bag of the spiral groove at the almost central part of the recessed heating surface. CONSTITUTION:At least one sprial groove 7 is formed to both recessed heating surfaces 4, 5 so as to extend to both of them to form one continuous spiral groove. The start end 8 and terminal 9 of the spiral groove 7 are positioned at the almost central part of the recessed heating surface 4. By this constitution, when a liquid entrance and exit tube is thermally fused to a sheet made of a synthetic resin, even if the molten resin generated when a tube 13 is fused to a sheet 11 flows out, said resin flows in the spiral groove 7 formed to the recessed heating surfaces of upper and lower molds and no burr is generated. Since the groove 7 is spiral, the molten resin at any part is easy to flow in the groove and, as a result, the generation of burr is effectively suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a mold for manufacturing medical bags and a manufacturing method using the same.

[Prior Art] A medical bag is a container made of soft synthetic resin used for collecting and storing blood and medical solutions in a sterile state, and used for blood transfusions and the like. As shown in FIG. 7, this medical bag has a bag main body (goods) made by zero-force thermal welding of two synthetic resin sheets OD at their outer peripheral edges, and Periphery 0
A tube 0 for a liquid inlet and outlet is heat-sealed between 2).

In addition, this tube ■■■ is wrapped with a protector made of soft synthetic resin such as vinyl chloride to maintain sterile conditions, and sealed by means such as welding. It's becoming a sea urchin.

The old one was a flexible tube for transferring liquids.

Conventionally, the bag body 00) and the tube (self) have been thermally fused using a mold as shown in FIG. That is, in the same figure, (51) is the upper mold, (52)
are the lower molds, and both molds have concave heating surfaces (53>, (54)) with a semicircular cross section, and flat heating surfaces (55>, (5B) are also provided on both sides of the molds). It is being

Pass the mandrel (57) through the tube ■■■, sandwich the tube 0 between the outer peripheral edge (+2) of the synthetic resin sheet (I1), and press it between the upper die (5l) and the lower die (52). and heat.

As a result, the plastic sheath (If) and the synthetic resin of the tube 0 are melted and fused together.

[Issues to be Solved by the Invention] However, in the conventional manufacturing method, surplus molten resin during fusion leaks out before and after the molds (51>, (52)), creating a gap.

Normally, this part tends to come out at the position where the upper mold (51) and lower mold (52) meet, so it protrudes from both sides of the tube 03, as shown by the symbol (60) in FIG. The Paris (60) causes problems in that it obstructs the flow of liquid or leaves liquid behind during use.

In order to solve this problem, the manufacturing method disclosed in Japanese Patent Publication No. 1-17375 was proposed. In this conventional example, as shown in FIG. 9, two molds (IIA) are provided with a protruding first land (114), a recessed second land (115), and a third land (11B). Hewei resin sheath} (102)
When the tube (104) and the tube (104) are fused together, the remaining resin collects in the small space (117).

However, even in this conventional example, when the amount of molten resin is larger than the volume of the small space (117), the space where the amount of molten resin is larger than the volume of the small space (117) is
0), so the above-mentioned problems such as residual liquid cannot be solved.

In view of such circumstances, the present invention aims to prevent the formation of bubbles when heat-sealing a liquid inlet/outlet tube to a bag.
The purpose is also to prevent liquid from remaining even if liquid is released.

[Means for Solving the Problems] The medical bag manufacturing mold of the present invention has a mold for heat-sealing a liquid inlet/outlet tube to the outer peripheral edge of two synthetic resin sheets constituting a medical bag. A heating mold, wherein each of the upper mold and the lower mold is recessed in a semicircular arc shape so that a cylindrical space capable of accommodating the tube is formed when the upper mold and the lower mold of the heating mold are combined. A concave heating surface is formed,
and at least one continuous spiral groove is formed in the biconcave heating surface, and at least an end of the spiral groove that communicates with the inside of the bag is located approximately in the center of the concave heating surface. It is something.

Further, in the manufacturing method of the present invention, a liquid inlet/outlet tube sandwiched between two synthetic resin sheets is installed between the upper mold and the lower mold of the heating mold, and then the upper mold and the lower mold are connected to each other. The method is characterized in that the tube and sheet are heated and thermally fused.

[Function] When the liquid inlet/outlet tube is heat-sealed to a synthetic resin sheet according to the present invention, even if the molten resin formed when the tube and sheet are fused flows out, the concave heating of the upper and lower molds is prevented. Since it flows into the spiral groove formed on the surface, no sparks occur.

Moreover, since this groove is a spiral, the molten resin in any part easily flows into the groove, so that the occurrence of flash is effectively suppressed.

In addition, in the present invention, the end of the spiral groove that leads into the bag is located approximately at the center of the concave heating surface and is located farthest from the position where the two sheets are joined, so that the molten resin may flow out of the groove and form a barrier. Even if it were, it could not be done at the position where two sheets are joined together, but could be done on the sheet surface, so no liquid would remain during use.

[Example] Next, embodiments of the present invention will be described.

FIG. 1 is a perspective view of a heating mold according to an embodiment of the present invention, FIG. 2 is a front view of the heating mold shown in FIG. 1, and FIG. 3 is a view of the heating mold in use. (I) in Figure 4 -
(I) A cross-sectional view along the line, FIG. 4 is a conceptual diagram showing the spiral groove in the heating mold in use, FIG. 5 is a partially enlarged view of the medical bag manufactured according to the present invention, and FIG. 6 is a comparison. FIG. 2 is a cross-sectional view of an example heating mold.

In FIG. 1, (1) is the heating mold of the present invention, which consists of an upper mold (2) and a lower mold (3). Upper mold (2) and lower mold (
3) has a concave heating surface (4) depressed in the shape of a semicircular arc, (■
are formed respectively, and flat heating surfaces (6
) is formed. The concave heating surfaces (4) and (S are opposed to each other, so that when the upper mold (2) and lower mold (3) are combined, a cylindrical space capable of accommodating the tube 0 is created. At least one spiral groove (7) is formed in the double concave heating surfaces (4), (5).This spiral groove (7) is formed in both the concave heating surfaces (4), (5). ), and as shown in the conceptual diagram in Figure 4, it is one continuous spiral groove.
) are located at approximately the center of the concave heating surface (4).

The central portion here refers to the position farthest from the position where the upper mold (2) and the lower mold (3) meet. In the embodiment shown in the ffil figure, the starting end (8) and the ending end (9) are provided on the upper mold (2), but they may be provided at least on the end leading to the inside of the bag (goods).

The depth and width of the spiral groove (7) may be determined computationally or experimentally depending on the amount of molten resin produced during fusion.

Next, a method of fusing the tube 0 and sheet 01) using the heating mold (1) will be explained.

As shown in Fig. 2, a tube 0 sandwiched between two sheets (of) is placed between the upper mold (2) and the lower mold (3),
If necessary, insert the mandrel (b) into tube 0. Then, as shown in FIG. 3, the upper mold (2) and the lower mold (3) are closed together and subjected to high frequency heating. In this way, the upper mold (2)
and heating surface (4), (■, (6) of lower mold (3))
1) and tube 0 are heated, sheet (1?)
The tubes melt and fuse together. Then, when the molten resin melts out, it enters the spiral groove (7) and fills the spiral groove (7).
) out of the alignment position? And most conflicts are prevented.

Even if the amount of molten resin becomes larger than the volume of the spiral groove ('7), the starting end (8) or the terminal end (9) of the groove (7)
(See Fig. 4), so that it only sticks to the sheet aI), so it does not stick to the position where the two sheets OD meet (see Fig. 5) .

Therefore, in the medical bag manufactured according to the present invention, no liquid remains even if dirt adheres to the bag.

Next, an experiment was conducted to determine whether or not Paris occurred in the following manner.

Example 1 Two sheets of soft vinyl chloride film (thickness: 0.3 mm) were prepared as a synthetic resin sheet 01), and a tube 03) was prepared.
As a pipe-shaped tube made of polyvinyl chloride (inner diameter: l5
ffll1, outer diameter: 18a+m) was prepared, and then the sheet (Il1 and tube After inserting and sandwiching between the spiral grooves (radius 0.4 mm), use a high frequency welder (Quinlite Denshi Seiko ■).
Manufacturer, product number: LWI1 4080SB, output: 4KW,
Using a frequency of 46 M tl z ), a voltage of 200 mm and a current of 0.3 A were applied between the heating molds to weld the sheet 01) and the tube (self), and a medical bag (capacity: 5 m) was welded.
00ml) was prepared. No paroxysm was observed at the base of tube 0 of the obtained medical bag.

Comparative Example As a comparative example, a heating mold (40) with rounded corners (4l) was prepared, and an experiment was conducted in the same manner as in Example 1.

In this comparative example, cracks occurred at the position where the sheets were aligned leading to the inner surface of the bag.

[Effects of the Invention] According to the present invention, when fusing liquid inlet/outlet tubes, no flakes are generated, and even if they occur, they adhere to areas that do not interfere with the flow of the liquid, so liquid remains. Never.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a heating mold according to an embodiment of the present invention, FIG. 2 is a front view of the heating mold shown in FIG. 1, and FIG. 3 is a view of the heating mold in use. (1) in Figure 4 -
(I) A cross-sectional view along the line, FIG. 4 is a conceptual diagram showing the spiral groove in the heating mold in use, FIG. 5 is a partially enlarged view of the medical bag manufactured according to the present invention, and FIG. 6 is a comparison. 7 is a plan view of a medical bag manufactured using a conventional heating mold, FIG. 8 is a sectional view of a conventional heating mold, and FIG. 9 is another conventional example. FIG. 3 is a sectional view of a heating mold. (Main symbols in the drawing) (1): Heating mold (2): Upper mold (3) Two lower molds (4), (5): Concave heating surface (7): Spiral groove 1 opening 5 Snake A-side '72 size 3'; P4 mouth'; P 6 mouth O7 yen

Claims (1)

[Scope of Claims] 1. A heating mold for heat-sealing a liquid inlet/outlet tube to the outer periphery of two synthetic resin sheets constituting a medical bag, the heating mold having an upper mold. A concave heating surface recessed in a semi-circular arc shape is formed in each of the upper mold and the lower mold so that a cylindrical space capable of accommodating the tube is formed when the upper mold and lower mold are combined, and the biconcave heating surface A mold for manufacturing a medical bag, wherein at least one continuous spiral groove is formed in the heating surface, and at least an end of the spiral groove communicating with the inside of the bag is located approximately in the center of the concave heating surface. 2. A liquid inlet/outlet tube sandwiched between two synthetic resin sheets is installed between the upper mold and the lower mold according to claim 1, and then the tube and the sheet are inserted between the upper mold and the lower mold. A manufacturing method for medical bags characterized by heating and heat-sealing.