CN2277338Y

CN2277338Y - Three-layered drinking hard tube

Info

Publication number: CN2277338Y
Application number: CN 96201161
Authority: CN
Inventors: 林丰钦
Original assignee: Nan Ya Plastics Corp
Current assignee: Nan Ya Plastics Corp
Priority date: 1996-02-16
Filing date: 1996-02-16
Publication date: 1998-04-01
Anticipated expiration: 2006-02-16

Abstract

The utility model relates to a three-layered drinking hard tube coextruded by three or a plurality of layers, an internal layer uses thermoplastic resin, an external layer is coated with PVC resin, an intermediate layer uses cementing resin as the cement between different kinds of resin of the internal and the external layers, and the three layers are coextruded into a drinking hard tube. The utility model can solve the shortcomings of the prior double-layer structure hard tubes that weak cementatory property between different materials results in the isolation of the internal and the external layers because of expansion in high temperature and shrinkage in low temperature, the double-layer structure hard tube is hard for production, etc. The utility model has the advantages of simple structure, good cementatory property and simple fabrication, which is easy for continuous production.

Description

Drinking-water is total to the hard tubes that extrude with three layers

The utility model relates to the metal tube that a kind of operation forming field does not have cutting metal machining substantially, particularly relates to drinking-water that a kind of three layers or multilayer extrude altogether with three layers of hard tube that extrudes altogether.

Present known drinking-water hard tube, its compound structure is disclosed in No. the 78204337th, Taiwan and No. 79209254 patent case, and it is the junction that utilizes inner and outer pipe, makes annular dentate stripe, or interior tube-surface has several prominent bodies, strikes up partnership and its inner and outer pipe can be worn mutually.The type body of the mould that uses is comparatively complicated to be difficult for producing but this kind structure easily takes place in actual production, and this double-deck hard tube has between unlike material because associativity is not good, and cause the segregative problem of inside and outside layer, particularly rising-heat contracting-cold is even more serious.

Main purpose of the present utility model is, a kind of hard tube of drinking water and extruding altogether with three layers is provided, it is at the defective of PVC running water double-decker hard tube, making a kind of internal layer is thermoplastic resin, the outer polyvinyl chloride resin that uses, can solve the problem that these two kinds of xenogenesis interlaminar resin adhesions are poor, easily peel off, reduce the complexity of production mould, improve the shortcoming that is shaped and is difficult for; Especially constitute the hard tube that three layers or multilayer extrude drinking-water usefulness altogether as the solid of outer polyvinyl chloride resin and internal layer thermoplastic resin with bonding resin, can thoroughly solve the shortcoming that the known techniques means are produced at the middle level structure division.

The purpose of this utility model is realized by following technical scheme.A kind of hard tube of drinking water and extruding altogether with three layers, following layer, skin and internal layer in the middle of it comprises, middle following layer is combined into one skin and internal layer, wherein: middle following layer is a kind of a kind of thermoplastic resin of the colony that is made of ethylene-vinyl acetate EVA (EVA), low density polyethylene (LDPE) (LDPE), high density polyethylene (HDPE) (HDPE), polypropylene (PP) or PUR of its EVA of being selected from; Skin is polyvinyl chloride (PVC) or its upgrading body; Internal layer is for being selected from a kind of thermoplastic resin or its EVA of the colony that is made of ethylene-vinyl acetate EVA (EVA), low density polyethylene (LDPE) (LDPE), high density polyethylene (HDPE) (HDPE), polypropylene (PP); Above-mentioned three extrudes altogether and constitutes the hard tube of one.

The utility model compared with prior art has obvious advantage and good effect.It is the defective that PVC running water hard tube that stabilization agent is produced has aforementioned double-decker hard tube at society to adding lead for a long time, adopting a kind of three layers or multilayer extrusion technology altogether to make a kind of internal layer is thermoplastic resin, the outer polyvinyl chloride resin that uses, and can solve these two kinds of xenogenesis interlaminar resins the problem that adhesion is poor, easily peel off is arranged, overcome this and adopt the complicated mechanical embedded structure, can reduce the complexity of production mould, improve the shortcoming that these can increase cost and be shaped and be difficult in processing procedure; Special exploitation constitutes the hard tube that three layers or multilayer extrude drinking-water usefulness altogether at the middle level structure division with bonding resin as the solid of outer polyvinyl chloride resin and internal layer thermoplastic resin, can thoroughly solve the shortcoming that the known techniques means are produced, have effect economical and practical, that reduce production costs, significantly reduce the finished product fraction defective and enhance productivity.

In sum, the utility model is compared with existing double-deck hard tube, no matter its textural at hard tube, or on the technology contents of producing, all reached the value on the industry, and be better than located by prior art and goods thereof; And its simple structure, crudy is good, production efficiency is high, thereby is suitable for practicality more, is a novelty, practical new design in fact.

Concrete structure of the present utility model is provided in detail by following examples and accompanying drawing thereof.

Fig. 1 is the structural representation of the utility model finished product.

Fig. 2 is the vertical section structure schematic diagram of the utility model finished product.

At first see also shown in Figure 1, the utility model drinking-water is total to the hard tubes that extrude with three layers, it constitutes innermost layer 1 by thermoplastic resin, the bonding resin of middle level structure division at least a material that is selected from the colony that constitutes by ethene one vinyl acetate copolymerized resin (EVA), low density polyethylene (LDPE) (LDPE), high density polyethylene (HDPE) (HDPE), polypropylene (PP) and other thermosols etc. as

middle following layer

2,3 of outermost layers use polyvinyl chloride resins commonly used; Because polyvinyl chloride resin is to be used for skin, and more because the utility model adopts three layers or sandwich construction, and the technology that adopts multilayer to extrude altogether, so the double-decker of commonly using has more the effect of isolated protection; The utility model extrudes technology altogether with three layers and the prepared drinking-water of manufacturing installation is configured to principal character with hard tube, and can apply to the manufacture process that the multilayer more than three layers extrudes altogether; The existing common extrusion hard tube that makes with three layers of structure that extrudes altogether and technology contents of the utility model is described as follows, but the utility model is not as limit.

See also shown in Figure 2, it is the close proximity structural relation of three layers of the utility model, wherein, because of the thermoplastic resin of internal layer 1 is the xenogenesis resin with outer 3 polyvinyl chloride resin, adhesion extreme difference between the two, so in the middle of following layer 2 select the bonding resin that has affinity for use, for example select one or more of resins such as PUR, EVA, LDPE, HDPE, PP for use, under molten condition, can be used as splendid solid give common extrusion and enter outer 3 and internal layer 1 between; The utility model is promptly with the solid of this bonding resin as two xenogenesis resins between polyvinyl chloride resin outer 3 and the thermoplastic resin internal layer 1, and become the middle level structure of the middle following layer 2 of a tubulose certainly, its existing commercially available combined type hard tube only adopts the embedded structure mode of different shape mechanical bond to have more economy, and has more stability of structure; So not only can save the processing charges of mould, also can reduce the complexity of processing, relatively can improve the processing characteristics of product.

The utility model drinking-water is total to the hard tubes that extrude with three layers, when making, it adopts three layers of technology that extrudes altogether, extrude the thermoplastic resin of fusion from extruding device, by mould molding is internal layer 1, be the middle following layer 2 in middle level through another mould molding again, be shaped to outer 3 by mould more at last and finish formative stage, through the cooling processing typing, the size that is cut into required size gets final product again.

Claims

1. the hard tube of drinking water and extruding altogether with three layers is characterized in that it comprises middle following layer, skin and internal layer, and middle following layer is combined into one skin and internal layer, wherein:

Middle following layer is a kind of a kind of thermoplastic resin of the colony that is made of ethylene-vinyl acetate EVA (EVA), low density polyethylene (LDPE) (LDPE), high density polyethylene (HDPE) (HDPE), polypropylene (PP) or PUR of its EVA of being selected from; Skin is polyvinyl chloride (PVC) or its upgrading body; Internal layer is for being selected from a kind of thermoplastic resin or its EVA of the colony that is made of ethylene-vinyl acetate EVA (EVA), low density polyethylene (LDPE) (LDPE), high density polyethylene (HDPE) (HDPE), polypropylene (PP); Above-mentioned three extrudes altogether and constitutes holistic hard tube.