KR20060044202A - Port tube for non-pvc bags - Google Patents

Abstract

The present invention relates to a potion tube for non-PVC sap bag, and more particularly, it is composed of polypropylene resin having a melting point of 125 to 165 ° C. and has a thickness of 5 to 40% of the tube cross-sectional thickness. It is related with the pot tube characterized by consisting of an outer layer part and polyolefin type resin whose Shore D hardness is 70 or less, and an inner layer part whose thickness is 60 to 95% of the tube cross-sectional thickness.

Non-PVC Bags, Sap Bags, Potts, Tubes

Description

Port tube for non-PVC bags

The present invention relates to a potty tube for non-skin seed sap bag, and more particularly, to an outer layer having excellent heat resistance and excellent adhesion to a non-skin seed sap bag material, and excellent flexibility and adhesion to a potion. It relates to a pot tube made of a friction-resistant inner layer.

In general, sap (輸液), such as physiological saline solution and glucose solution administered to a patient when operating or treating a patient in a hospital is stored in a medical container of some form. Conventionally, many sap containers mainly made of glass bottles have been used because of material advantages, but glass bottle containers have a problem of being bulky, fragile, and heavy, such that pouch-type sap bags made of synthetic resin have recently been used. have. Synthetic resin sap bags are not easily broken because they are easy to handle and easy to store and transport. Recently, the sap container market is rapidly being replaced by synthetic sap bags.

As a material of the synthetic resin sap bag that has been used conventionally, a polyvinyl chloride (PVC) film having a good transparency and softness has been mainly used, but plasticizers included in PVC have been used for some time. As a material and a controversy over the safety, the sap bag using a non-PVC material, so-called non-PVC film is being developed one after another.

On the other hand, a pouch-type sap bag is provided with one or two cylindrical tubes leading to the outside, and a pot for inserting a spike used to drain the contents or a syringe for injecting drugs at the end of the tube. (Port) is installed. At this time, the tube is installed integrally with the sap bag when sealing the edge of the bag to produce the sap bag. However, in the case of the conventionally developed non-PVC sap bag, the tube material and the non-PVC sap bag material are not compatible with each other, and thus the junction part thereof is not completely sealed, and thus leakage or breakage during storage or transportation of the sap bag. This often happened. In addition, the tube is crushed or the outer peripheral surface and the inner peripheral surface of the tube to be inserted and installed at the end of the tube is not in close contact with each other, there is a problem that the port is eventually released from the tube.

In order to solve this problem, Korean Patent Application No. 194-7000102 has a tube co-extruded in a three-layer structure. The tube comprises a mixture of polypropylene copolymer and styrene-ethylene-butylene-styrene copolymer, an outer layer having a thickness of 2.5 to 30% of the total cross-sectional thickness, and a tie having a thickness of 2.5 to 20% of the total cross-sectional thickness. Layer, and a polyvinyl chloride core layer with a thickness of 50 to 95% of the total cross-sectional thickness. That is, the polypropylene copolymer having good adhesion with the non-PVC film is used as the outer layer, the soft and tough PVC is used as the core layer, and the intermediate layer connecting the outer layer and the core layer to provide adhesive strength is polyester or polyester. And a mixture of polypropylene and co-extruded. However, such multi-layer coextrusion tube lacks compatibility between the resin component constituting the intermediate layer and the resin component constituting the inner layer and the inner layer, and thus has poor transparency. In particular, the inner layer that is in direct contact with the fluid injected into the body is an environmental pollution material. Since polyvinyl chloride is used, safety is still not secured, and a large amount of environmental pollutants are emitted during disposal.

Thus, in order to solve the above-mentioned problems of the prior art, since the PVC material is not used at all, it is completely harmless to the human body and is environmentally friendly, and at the same time, it has excellent compatibility with non-PVC film and adhesion with pot. The purpose is to provide a pot dive for non-PVC sap bag with no fear of leakage.

The present invention consists of a polypropylene resin having a melting point of 125 to 165 ° C., an outer layer portion having a thickness of 5 to 40% of a tube cross section thickness, and a polyolefin resin having a Shore D hardness of 70 or less, and a thickness of the tube cross section thickness. It is a pot tube for non-PVC sap bag, characterized in that the inner layer portion is 60 to 95%.

The present invention is described in more detail as follows.

The present invention consists of a double structure of the outer layer portion and the inner layer portion. First, the outer layer part is made of a polypropylene resin having a melting point of 125 to 165 ° C., and has excellent heat resistance and yield strength, and excellent compatibility with a sap bag made of a non-PVC synthetic resin film. Specifically, the polypropylene resin may be a homopolypropylene, a polypropylene copolymer or a mixture thereof. The copolymer may be in the form of a random copolymer, a block copolymer or a graft copolymer. At this time, if the melting point of the polypropylene resin is less than 125 ℃ can not satisfy the desired heat resistance, the yield strength is difficult to maintain the appearance of the tube, especially during the sterilization treatment, the tube may be deformed due to lack of heat resistance. On the contrary, the polypropylene-based resin having a melting point of 165 ° C is not practically present, and even if it exists, it is impossible to use due to poor workability.

The thickness of the outer layer portion is most effectively in the range of 5 to 40%, preferably 10 to 20% of the thickness of the cross section of the tube. If the thickness of the outer layer is less than 5%, it is difficult to maintain the shape of the tube, and the heat resistance during the sterilization treatment is insufficient, so that the shape of the tube is distorted or severely contracted, resulting in poor mechanical properties and appearance. If exceeded, the strength of the entire tube is weakened, and the flexibility and elasticity are lowered, which may cause easy bending or lack of transparency.

Next, the inner layer part of the present invention is composed of a polyolefin resin having a Shore D hardness of 70 or less, and has excellent flexibility and restoring power and good compatibility with the outer layer part, and thus does not cause layer separation. The adhesive force with has excellent characteristics. As an example of the polyolefin resin, any one or a mixture of two or more selected from low density polyethylene, linear low density polyethylene, ethylene vinyl acetate, and a copolymer of ethylene and an alpha olefin having 3 to 12 carbon atoms can be used.

 In this case, as the alpha olefin having a range of 3 to 12 carbon atoms, for example, propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-heptene, 1-octene, 1-nonene, 1-decene, 1-undecene and 1-dodecene and the like, and also ethylene vinyl acetate copolymer, ethylene methacrylic acid copolymer, ethylene methacrylic acid ester copolymer, ethylene styrene copolymer, propylene styrene copolymer, propylene ethylene butene Copolymers, propylene styrene ethylene butadiene copolymers, ethylene methyl methacrylate copolymers, ethylene methacrylate acrylic copolymers, ethylene propylene diene copolymers, thermoplastic elastomers, styrene-based elastomers, other crosslinked elastomers, and the like. have. If the Shore D hardness is 70 or more in the inner layer portion of the present invention, the tube hardness is so high that the flexibility and the restoring force are insufficient, so that it can be easily bent, and the adhesion to the pot is poor, so that the pot is easy to fall out.

Meanwhile, in the present invention, the inner layer part may be formed in a double structure again. That is, the middle layer is made of polypropylene and polyethylene having low cost and relatively low heat resistance among the polyolefin resins, and the inner layer part is a polyolefin resin having good adhesion to potents, and is made of low density polyethylene, linear low density polyethylene, ethylene vinyl acetate and ethylene. One or a mixture of two or more selected from copolymers of alpha olefins having 3 to 12 carbon atoms can be used. In addition, when the resin component between the intermediate layer and the inner layer part is different and lacks compatibility with each other, the intermediate layer can also be used as a tie layer, it is possible to easily obtain the desired physical properties by using a variety of resin.

Brief description of the method of manufacturing the potting tube of the present invention as follows.

The tube of this invention melt-extrudes raw material resin at 200-220 degreeC using an extruder. Extruded through die pins and bushings of appropriate size, firstly molded in a cooling bath, passed through a first takeover roll of rubber and silicone, and then made into tubes of suitable diameter on a second takeover roll. . In order to overcome the memory effect of the tube, the tube of the present invention is produced by cutting to an appropriate length through a heat setting bath which is heated to a temperature lower than the melting temperature.

The present invention will be described in detail by the following examples. However, the present invention is not limited by the following examples.

Example 1

       Inner layer material uses "AFFINITY" KC8852 (density 0.875 g / cm 3, MFR 3.0 g / 10min (190 ° C, 2.16Kg)) of Dow Chemical Company as an ethylene copolymer, and random polypropylene as outer material. R145D [density 0.900 g / cm 3, MFR 8.0 g / 10min (230 ° C., 2.16 Kg), melting point about 145] of LG Caltex Refinery Co., Ltd. It became% and coextruded so that the outer layer part might be 40%, and the outer diameter was 8.2 mm, and the inner diameter was 6.2 mm.

Example 2

       For the inner layer material, Dow Chemical Company's "AFFINITY" KC8852 (density 0.875 g / cm 3, MFR 3.0 g / 10min (190 ° C, 2.16Kg)), an ethylene copolymer, was used. "DOWLEX" 2027A (density 0.941 g / cm 3, MFR 4.0 g / 10min (190 ° C, 2.16 Kg), melting point approx. 127] and R145D [density of LG Caltex Essential Oil] 0.900 g / cm 3, MFR 8.0 g / 10min (230 ° C., 2.16 Kg), melting point about 145], with the intermediate layer at 60% of the tube cross-sectional thickness under the conditions of an extruder temperature of 170 to 230, and the outer and inner layers Coextrusion was carried out so that the additions were 20%, respectively, to prepare a tube having an outer diameter of 8.2 mm and an inner diameter of 6.2 mm.

Comparative Example 1

       The same method as in Example 1 was carried out by extruding R145D (density 0.900 g / cm 3, MFR 8.0 g / 10min (230 ° C., 2.16 Kg), melting point about 145 ° C.) of LG Caltex Refinery, a random polypropylene, into a single layer. Was prepared.

Comparative Example 2

       Dow Chemical Company's "DOWLEX" 2027A (density 0.941 g / cm 3, MFR 4.0 g / 10min (190 ° C, 2.16 Kg), melting point about 127 ° C), an ethylene-based copolymer, was extruded into a single layer, the same as in Example 1. The tube was prepared by the method.

Comparative Example 3

       Samsung's homopolypropylene is used as the outer layer material using "AFFINITY" KC8852 (density 0.875 g / cm3, MFR 3.0 g / 10min (190 ° C, 2.16Kg)) of Dow Chemical Company as an inner layer material. Use HF420 (density 0.900 g / cm3, MFR 8.0 g / 10min (230 ° C, 2.16 Kg), melting point about 161 ° C) of General Chemistry, with the inner layer thickness being 40% of the tube cross-sectional thickness and the outer layer thickness remaining. Coextruded to 60% to prepare a tube in the same manner as in Example 1.

Comparative Example 4

       Samsung's homopolypropylene is used as the outer layer material using "AFFINITY" KC8852 (density 0.875 g / cm3, MFR 3.0 g / 10min (190 ° C, 2.16Kg)) of Dow Chemical Company as an inner layer material. Total chemical HF420 (density 0.900 g / cm3, MFR 8.0 g / 10min (230 ° C, 2.16 Kg), melting point approx. 161 ° C) and "AFFINITY" KC8852 from Dow Chemical Company (density 0.875 g / cm3) , MFR 3.0 g / 10min (190 ℃, 2.16Kg)] is used by blending in a ratio of 1: 1, by co-extrusion so that the thickness of the inner layer portion 40% of the tube cross-sectional thickness, the thickness of the outer layer portion to the remaining 60%. A tube was prepared in the same manner as in Example 1.

TABLE 1

division Outer layer Inner layer Daytime Inner layer Composition (weight ratio) thickness(%) Composition (weight ratio) thickness(%) Composition (weight ratio) Thickness ($) Example 1 PP (2) (100) 40 - - PE (1) (100) 60 Comparative Example 2 PP (2) (100) 20 PE (2) (100) 60 PE (1) (100) 20 Comparative Example 1 PP (2) (100) 100 - - Comparative Example 2 PP (2) (100) 100 - - Comparative Example 3 PP (1) (100) 60 - - PE (1) (100) 40 Comparative Example 4 PP (1) / PE (1) (50/50) 60 - - PE (1) (100) 40

(NB) In Table 1, PE (1) is "AFFINITY" KC8852, PE (2) is "DOWLEX" 2027A, PP (1) is HF420 of Samsung General Chemicals, PP (2) is LG Caltex Oil R145D Indicates.

Experimental Example

Physical properties of the tubes prepared according to Examples 1 and 2 and Comparative Examples 1 and 4 were measured by the following methods, and the results are shown in Table 2 below.

First, the melt index refers to the amount of thermoplastic resin (g) exiting through an orifice having a diameter of 2.09 mm in 10 minutes at a specific pressure (2.16 kg / cm 2) and temperature (PP: 230, PE: 190). , ASTM D-1238 was measured at 230, and melting temperature was measured using DSC according to ASTM D-2117.

To check the strength and stiffness of a tube sample prepared according to the above conditions, the sample was measured at 100% elongation with an Instron tester at a crosshead speed of 100 cm (20 inches) per minute and then Yield strength (kgf / cm 2).

In addition, the tube length for each group of tubes was measured, the tube sample was sterilized using an autoclave for about 120 and 20 minutes, then the tube sample was taken out and cooled to ambient temperature again measuring the length of the sample, the shrinkage rate Is shown in Table 2 below.

Transparency was checked after relative comparison with the naked eye, and bending and elasticity were checked to the extent that the tube sample was recovered after bending at right angles. Adhesiveness with the port was automatically removed by plugging the port into the tube after automatic forming machine. Checked to the extent. Finally, the thermal adhesion between the sap bag fabric and the tube was visually checked for sealing after fusion using an automatic forming machine.

TABLE 2

division Yield strength (kgf / ㎠) Shrinkage (%) transparency Bendability Elasticity Adhesion with port Heat adhesiveness of sap encyclopedia Example 1 80 0.8 ◎◎ ◎ ◎ ◎◎ ◎◎ Example 2 75 1.0 ◎◎ ◎ ◎ ◎◎ ◎◎ Comparative Example 1 135 0.6 O × × × O Comparative Example 2 65 2.3 △ ◎ ◎ △ × Comparative Example 3 92 0.7 O △ △ ◎ ◎ Comparative Example 4 85 1.2 × ◎ ◎ ◎ ◎   (NB) transparency, bendability, elasticity, heat adhesiveness ◎◎ 'excellent', ◎ 'excellent', 'good', △ 'normal', 'bad'

As shown in Table 2, the tube produced according to Examples 1 to 2 of the present invention was properly measured yield strength, transparency, adhesion, heat adhesion is superior to the tube prepared according to Comparative Examples 1-4 It was also found to be excellent in bending and elasticity.

As described above, the potting tube of the present invention is a non-PVC tube coextruded in a two-layer or three-layer structure, and has excellent heat resistance, adhesiveness with a non-PVC sap bag, sealing with a port, transparency, and the like. In particular, it is possible to adhere to the non-PVC sap bag, which has recently been spotlighted as a new environmentally friendly material, so that it can be adhered to airtightly. Can be used.

Claims (3)

It consists of a polypropylene resin having a melting point of 125 to 165 ° C., and an outer layer part having a thickness of 5 to 40% of the tube cross section thickness, and a polyolefin resin having a Shore D hardness of 70 or less and a thickness of 60 to 95 of the tube cross section thickness. Portion tube for non-skin seed sap bag, characterized in that the inner layer consisting of%. The non-skin seed according to claim 1, wherein the polyolefin resin is any one or a mixture of two or more selected from low density polyethylene, linear low density polyethylene, ethylene vinyl acetate, and a copolymer of ethylene and an alpha olefin having 3 to 12 carbon atoms. Portion tube for the sap bag. The inner layer portion is composed of a double structure of the intermediate layer and the inner layer portion, the intermediate layer is made of polypropylene or polyethylene, the inner layer portion is a polyolefin resin, low density polyethylene, linear low density polyethylene, ethylene vinyl acetate and ethylene and carbon number 3 ~ A port tube for non-skin seed sap bag, characterized in that any one or a mixture of two or more selected from copolymers of twelve individual alpha olefins.