CN201703613U

CN201703613U - Easy-stretching bottle blank

Info

Publication number: CN201703613U
Application number: CN2010202212613U
Authority: CN
Inventors: 刘铁峰; 王震辉; 杨天翠; 卢云峰
Original assignee: SHANGHAI ZIJIANG ENTERPRISE GROUP CO Ltd
Current assignee: SHANGHAI ZIJIANG ENTERPRISE GROUP CO Ltd
Priority date: 2010-06-09
Filing date: 2010-06-09
Publication date: 2011-01-12
Anticipated expiration: 2020-06-09

Abstract

The utility model relates to an easy-stretching bottle blank, which comprises two parts: a bottom opening and a blank body, wherein the blank body comprises a body of the blank and a blank bottom, wherein at least the blank bottom is in a smooth parabola shape. After the adoption of such a structure, the flowing trace of raw materials in a mold can be shortened during the heating stretching, the bottle blank can be completely stretched more easily, un-stretched dead corners do not exist at the blank bottom, and the bottle shape wall thickness has uniform distribution, so the gram weight of the bottle blank can be relatively reduced, and raw materials can be saved. In addition, the utility model can also adopts the blank body which is integrally formed by the body of the blank and the blank bottom, the transplacement of the mold can not easily occur during the split joint of the mold, the service life of the mold can be prolonged, the service performance of the bottle blank is improved, the requirement of convenient blank taking through opening and closing the mold can be met, and the occurrence probability of thick and large appearance and parting edges of molding lines can be greatly reduced.

Description

A kind of easily-stretched bottle preform

Technical field

The utility model relates to a kind of bottle base, and relating in particular to material is the easily-stretched bottle preform of polyethylene terephthalate.

Background technology

The plastic container bottle, especially adopt two-step method to carry out the polyethylene terephthalate bottle of bottle blowing, this bottle uses injection machine to produce its half-blank bottle base one by one usually earlier, and then utilizes bottle blowing machine that bottle base is carried out post bake after drawing bottle blowing before bottle blowing.Adopt the two-step method bottle blowing to compare with traditional single stage method, production efficiency greatly is improved, and is adopted by increasing wrapping enterprise.

When adopting two-step method to carry out bottle blowing, bottle base need carry out post bake in bottle blowing machine, and stretch-blow, the bottle base that tradition is used, be designed to dome-type at the bottom of the base, in the stretch-blow process, be difficult at the bottom of the base being stretched fully, the bottle bottom is easy to generate buildup, and protrude easily at the bottle end after can, the in-use performance of final influence bottle, this bottle base is when injection moulding simultaneously, because the bottom is designed for dome-type, the flow trace of raw material in mould is longer, influence the fluency of raw material, be prone to bottleneck and lack defectives such as material.

Below the conventional bottles base is done concrete analysis:

Fig. 1 shows the structural representation of traditional bottle base, as shown in Figure 1, traditional bottle base by bottleneck 1, base body 2, base at the bottom of 3 three parts constitute, base body 2 designs for linear portion, 3 design for dome-type at the bottom of the base, for mould open/close, to get base convenient, every part all is monomer independently, when bottle base is produced in injection moulding, this three part mould again assembling combination together, therefore, traditional bottle base all has twice spue line 100,200, spue line 100 is positioned at bottleneck 1, base body 2 joints, and spue line 200 is positioned at 3 joints at the bottom of base body 2, the base.Such design the mould dislocation occurs easily when the mould assembly unit, cause defectives such as the bottle base spue line is thick, branch limit, and particularly along with the growth of die life, wear and tear in the spue line position, finally influences the in-use performance of bottle base.

Fig. 2 shows the scheme drawing of traditional bottle base when adding hot-stretch, as shown in Figure 2, when adding hot-stretch, under the application force of

stretch

8,3 will be drawn into back taper parabola earlier at the bottom of the base, and then drive base body 2 stretches downwards together, base body 2 just obviously exists a period of time to stagnate like this, in dead time, originally is in the base body of the condition of high temperature at this section, its temperature will be cooled off gradually, reduce, cause stretching insufficient, influence ensuing high pressure blowing, perhaps base body 2 heating-up temperatures own are too high, at the bottom of the base 3 when also stretching, just drive base body 2 and stretch downwards together, make bottom hemisphere base at the bottom of 3 places can't be stretched fully, when causing bottle blowing, bottle bottom buildup finally influences the performance of bottle.

Fig. 3 shows the heat effect figure of traditional bottle base, as shown in Figure 3, it is high more that bottleneck 1 following color is deeply felt the temperature indicating degree more, otherwise the shallow more expression temperature of color is low more, from figure, can find out intuitively, high more near geat 6 place's temperature more, otherwise it is low more to arrive bottleneck 1 place's temperature more, but temperature distributing disproportionation is even, this be because the base substrate of traditional bottle base by the base of dome-type at the bottom of and linear portion base body constitute, raw material injects from geat 6, the flow trace in mould is longer, it is low more to arrive bottleneck position 400 temperature more, lacks material so traditional bottle base often is prone at 400 places, bottleneck position, the problem that injection moulding is not full.

The utility model content

The utility model has overcome above-mentioned defective, and provide a kind of and can improve the fluency of raw material in mould, and the bottle base that when bottle blowing, easily stretches.

For achieving the above object, the utility model adopts following technical proposals.

A kind of easily-stretched bottle preform is made of bottleneck and base substrate two parts, and base substrate comprises at the bottom of base body and the base, it is characterized in that at least at the bottom of the base be slick and sly parabolic shape.

In a kind of embodiment of the present utility model, described bottleneck lower edge is a slick and sly parabolic shape at the bottom of base.

In the another kind of embodiment in the utility model, be slick and sly parabolic shape at the bottom of the described base, base is as the curve shape that is smoothly transitted into bottleneck at the bottom of base.

In the specific embodiment of the present utility model, be that one constitutes at the bottom of described base body and the base.

The utility model easily-stretched bottle preform, having adopted at least at the bottom of the base is slick and sly parabolic shape, when adding hot-stretch, shortened the flow trace of raw material in mould, improved the fluency of raw material in mould, made bottle base be more prone to be stretched fully, there is not the dead angle that is not stretched at the bottom of the base, bottle type Thickness Distribution is even, has so just reduced the bottle base grammes per square metre relatively, economizes in raw materials; And, base substrate by base body and base at the bottom of one constitute, when the mould assembly unit, be not prone to the mould dislocation, increase die life, promote the in-use performance of bottle base, both satisfied mould open/close to get base convenient, significantly reduced again that spue line is thick, the probability of occurrence on branch limit.

Description of drawings

Below in conjunction with the drawings and specific embodiments the utility model is elaborated:

The structural representation of Fig. 1 tradition bottle base;

The scheme drawing of Fig. 2 tradition bottle base when adding hot-stretch;

The heat of Fig. 3 tradition bottle base when injection moulding is imitated figure;

The structural representation of Fig. 4 the utility model easily-stretched bottle preform;

The scheme drawing of Fig. 5 the utility model easily-stretched bottle preform when adding hot-stretch;

The heat of Fig. 6 the utility model easily-stretched bottle preform when injection moulding is imitated figure.

Among the figure: at the bottom of traditional bottle base bottleneck 1, traditional bottle base base body 2, the traditional bottle base base 3, at the bottom of the bottleneck position 400 of traditional bottle base geat 6, traditional bottle base spue line 100, traditional bottle base spue line 200, traditional bottle base, easily-stretched bottle preform bottleneck 4, easily-stretched bottle preform base substrate 5, easily-stretched bottle preform base body 21, easily-stretched bottle preform base 31, the bottleneck position 500 of easily-stretched bottle preform geat 7, stretch 8, easily-stretched bottle preform spue line 300, easily-stretched bottle preform.

The specific embodiment

Describe in further detail below in conjunction with accompanying drawing and embodiment of the present utility model:

Fig. 4 shows the structural representation of the utility model easily-stretched bottle preform, as shown in Figure 4, easily-stretched bottle preform of the present utility model is made of bottleneck 4 and base substrate 5, base substrate 5 31 is formed at the bottom of by base body 21 and base, 31 are that one constitutes at the bottom of base body 21 and the base, 31 are slick and sly parabolic transition from bottleneck 4 lower edges at the bottom of the base.The utility model easily-stretched bottle preform, to 31 be that one constitutes at the bottom of base body 21 and the base, therefore it is made of bottleneck 4 and base substrate 5 (comprise base body 21 and base at the bottom of 31) two parts, adopt this two sections designs, when bottle base is produced in injection moulding, this two parts mould again assembling combination together, bottle base has only one spue line 300 in bottleneck below, spue line 300 is positioned at the joint of bottleneck 4 and base substrate 5.The utility model easily-stretched bottle preform is because adopted two sections designs, constitute by bottleneck 4 and base substrate 5 two parts, so bottle base has only 300 one spue line, when the mould assembly unit, be not prone to the mould dislocation, can also increase die life, promote the in-use performance of bottle base, both satisfied mould open/close to get base convenient, significantly reduced again that spue line is thick, the probability of occurrence on branch limit.

Fig. 5 shows the scheme drawing of the utility model easily-stretched bottle preform when adding hot-stretch, as shown in Figure 5, when bottle base when adding hot-stretch, under the application force of

stretch

8,31 directly drive base bodies 21 and stretch together at the bottom of the base, can not produce stagnation, make bottle base be more prone to be stretched fully, 31 do not exist the dead angle that is not stretched at the bottom of the base, and bottle type Thickness Distribution is even, moulding is good, has fundamentally solved the problem that can not be stretched fully that traditional bottle base exists when stretching.

Fig. 6 shows the heat effect figure of the utility model easily-stretched bottle preform, as shown in Figure 6, it is high more that bottleneck 4 following colors are deeply felt the temperature indicating degree more, otherwise the shallow more expression temperature of color is low more, from figure, can find out intuitively, high more near geat 7 place's temperature more, on the contrary it is low more to arrive mouth cylindrical part 500 place's temperature more, and the temperature gradual change, be evenly distributed.The utility model easily-stretched bottle preform, design by original linear portion and dome-type, making entire body into is slick and sly parabolic transition, so just shorten the flow trace of raw material in mould, reduced the resistance of raw material in flow process, and then improved the fluency of raw material in mould, make the very fast arrival easily-stretched bottle preform of raw material bottleneck position 500, and raw material still keeps very high temperature when arriving, and has not only solved the scarce material at bottleneck position, has also shortened injection cycle.

The utility model is not limited to adopt from bottleneck 4 lower edges at the bottom of the base 31 to be the technical scheme of slick and sly parabolic transition, can also only be provided with at the bottom of the base 31 and be slick and sly parabolic shape, base body 21 with 31 seamlessly transit at the bottom of the base, be at the bottom of the base 31 curve shapes that are smoothly transitted into bottleneck 4 lower edges.When such technical scheme also can make bottle base add hot-stretch, under the application force of stretch 8, directly drive the base body at the bottom of the base and stretch together, can not produce stagnation, make bottle base be more prone to be stretched fully, not have the dead angle that is not stretched at the bottom of the base, bottle type Thickness Distribution is even, and moulding is good.And this technical scheme also can shorten the flow trace of raw material in mould, reduce the resistance of raw material in flow process, and then improve the fluency of raw material in mould, make the bottleneck position of the very fast arrival easily-stretched bottle preform of raw material, uniformity of temperature profile has solved the scarce material problem at bottleneck position.

The utility model easily-stretched bottle preform, adopting slick and sly parabolic shape at the bottom of the base or on the base substrate, shortened the flow trace of raw material in mould during hot-stretch, improve the fluency of raw material in mould, make bottle base be more prone to be stretched fully, do not have the dead angle that is not stretched at the bottom of the base, bottle type Thickness Distribution is even, so just reduced the bottle base grammes per square metre relatively, economized in raw materials; In addition, base substrate adopts and is made of one at the bottom of base body and the base, when the mould assembly unit, be not prone to the mould dislocation, increase die life, promote the in-use performance of bottle base, both satisfied mould open/close to get base convenient, significantly reduced again that spue line is thick, the probability of occurrence on branch limit.

Claims

1. an easily-stretched bottle preform is made of bottleneck and base substrate two parts, and base substrate comprises at the bottom of base body and the base, it is characterized in that: be slick and sly parabolic shape at least at the bottom of the base.

2. easily-stretched bottle preform according to claim 1 is characterized in that: described bottleneck lower edge is a slick and sly parabolic shape at the bottom of base.

3. easily-stretched bottle preform according to claim 1 is characterized in that: be slick and sly parabolic shape at the bottom of the described base, base is as the curve shape that is smoothly transitted into bottleneck at the bottom of base.

4. according to the described easily-stretched bottle preform of the arbitrary claim of claim 1 to 3, it is characterized in that: be that one constitutes at the bottom of described base body and the base.