CN1483568A

CN1483568A - Polythene valve port bag and mfg method thereof

Info

Publication number: CN1483568A
Application number: CNA031317375A
Authority: CN
Inventors: 常国华
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-07-25
Filing date: 2003-07-25
Publication date: 2004-03-24
Anticipated expiration: 2023-07-25
Also published as: CN1201923C

Abstract

The present invention relates to a polyethylene valve bag and its preparation method. Said method includes the following steps: making internal and external polyethylene cylinder materials with needle holes be mutually cover-mounted together, making their needle holes be not arranged in same position; folding long circular mouths of two ends of double-layer cylinder material to make them into upper and lower bottom surfaces with multi-layer and polygonal geometric form; mounting a valve port on short edge of upper bottom surface, sticking a layer of face fabric on upper and lower bottom surfaces respectively; then respectively cover-mounting the heated high-pressure moulds on the lower bottom surface on the cover mould and lower bottom surface with lining mould so as to obtain the invented double-large gas-discharge double-bottom accordion rectangular polyethylene valve bag.

Description

A kind of polyethylene valve port bag and preparation method thereof

Technical field

The present invention relates to a kind of preparation method of plastic packaging bag, specifically a kind of double-deck exhaust Double bottom solid rectangle polyethylene valve port bag and preparation method thereof.

Background technology

At present, general polyethylene packaging bag is with a sack rectilinear seals, behind the dress thing with the direct tying of another sack or sticking mouthful or scald and mouthful form.Its capacity is little, the dress thing is few, and directly from opening wide the sack charging, it is big to seal area, seals difficulty during charging, and it is little that sack bears pressure, and sealing part easily breaks.Polyethylene packaging bag at the bottom of a kind of broadband mostly is to adopt adhesive to paste to form at the bottom of its bag.Its fastness is poor, is subjected to the influence of weather, high and low temperature bigger, and during low temperature easily harden, aliquation, come off in the location for paste, during high temperature the location for paste easily liquefy, feel like jelly, inharmonious, cause packing material to make moist and the loss that leaks, even cause environmental pollution.

Summary of the invention

In order to overcome the shortcoming that prior art exists, the invention provides a kind of double-deck exhaust Double bottom solid rectangle polyethylene valve port bag and preparation method thereof.

The technical solution used in the present invention is: be that the polyethylene inner/outer tube material that will have pin hole is nested, make pin hole on the inner/outer tube material not at same position, the oval mouth in two layered cylinder material two ends is folded into bottom surface on the geometric form of multi-layer multi-strip limit, load onto a valve port at the upper bottom surface minor face, on last bottom surface, stick on one deck lining again, respectively the bottom surface that is enclosed within on the cover die is carried out the pressurization welding of disposable many limits with the upper bottom surface that is lined with mould by the high pressing mold after the heating then, thereby make double-deck exhaust Double bottom solid rectangle polyethylene valve port bag.The shape of high pressing mold is identical with size with the shape of the required face of weld of last bottom surface with size, and its operating temperature is 160-200 °, and pressure is the 400-600 kilogram, and weld time is 8-15 second.

This polyethylene valve port bag adopts on the inner/outer tube material not at the pin hole of same position, in the time of can making the material filling of valve port bag in the bag air discharge rapidly, material is fully filled; The oval mouth in two layered cylinder material two ends is folded into bottom surface on many limit geometric forms of bed material multilayer, floor space is big up and down to make the valve port bag, and it is big to bear pressure; The upper bottom surface minor face is equipped with a valve port, and it is little to seal area, seals conveniently; High pressing mold carried out disposable many limit moment pressurization weldings to last bottom surface after employing was heated, and this method is convenient and swift, makes the welding of going to the bottom on the valve port bag firm, and fastness is good, the adhesive force height, stretching resistance is strong, heat resistanceheat resistant, cold-resistant, be subjected to external environment influence little, stop packing material and leak, long service life.

Description of drawings

Fig. 1 is this valve port bag manufacturing process schematic diagram.

In Fig. 1, inner core material 1, urceolus material 2, pin hole 3, upper base 4 goes to the bottom 5, valve port 6, lining 7, urceolus material internal orifice circle 8, inner core material collar extension circle 9.

The specific embodiment

The invention will be further described below in conjunction with the drawings and specific embodiments.

With polyethylene inner/

outer tube material

1,2 are cut into valve port bag Len req, at inner/outer tube material 1, evenly vertically sting respectively on 2 many row's pin holes 3 are arranged, the polyethylene inner/outer tube material 1 that will have

pin hole

3,2 are nested, make inner/outer tube material 1, pin hole 3 on 2 is not at same position, urceolus material internal orifice circle 8 and inner core material collar extension circle 9 high temperature welding respectively with two ends, the oval mouth in two layered cylinder material two ends is folded into respectively on many limit geometric forms of the overlapping multilayer of bed material and goes to the

bottom

4,5, on bottom surface 5, cover one deck lining 7 that area is identical with it, 5 be enclosed within on the cover die identical going to the bottom with the bottom surface area, by heating-up temperature is 160-200 °, pressure is that the high pressing mold of 400-600 kilogram carries out disposable many limits pressurization welding 8-15 second to bottom surface 5, upper bottom surface 4 minor faces are loaded onto a valve port 6, on upper bottom surface, add one deck lining 7 again, opening part from valve port 6 puts in a mould liner plate to another minor face then, by the high pressing mold after the heating upper bottom surface is carried out the pressurization welding of disposable many limits, thereby make double-deck exhaust Double bottom solid rectangle polyethylene valve port bag.If after the material filling of valve port bag, only need direct opening part to seal and get final product valve port.

Claims

1, a kind of polyethylene valve port bag and preparation method thereof, be that the polyethylene inner/outer tube material that will have pin hole is nested, make pin hole on the inner/outer tube material not at same position, the oval mouth in two layered cylinder material two ends is folded into bottom surface on the geometric form of multi-layer multi-strip limit, load onto a valve port at the upper bottom surface minor face, on last bottom surface, stick on one deck lining again, respectively the bottom surface that is enclosed within on the cover die is carried out the pressurization welding of disposable many limits with the upper bottom surface that is lined with mould by the high pressing mold after the heating then, thereby make double-deck exhaust Double bottom solid rectangle polyethylene valve port bag.

2, a kind of polyethylene valve port bag according to claim 1 and preparation method thereof, the shape of high pressing mold is identical with size with the shape of the required face of weld of last bottom surface with size, the operating temperature of high pressing mold is 160-200 °, and pressure is the 400-600 kilogram, and weld time is 8-15 second.