CN1041990C

CN1041990C - Method for making safety helmet of bicycle rider

Info

Publication number: CN1041990C
Application number: CN 93104671
Authority: CN
Inventors: 何昌宪
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-04-23
Filing date: 1993-04-23
Publication date: 1999-02-10
Anticipated expiration: 2013-04-23
Also published as: CN1094599A

Abstract

The present invention relates to a making method for a bicycle safe helmet which is made from polyurethane plastic foam combined with proper processes. The making method comprises ten working procedures: preheating a mould, covering a plastic film painted with ink lustre over a bottom mould, softening for deformation, pouring in a PU foaming body, quickly covering moulds, foaming for expansion, combining for shaping, demoulding cooling, trimming and perforating, and assembling. The method of the present invention has simple working procedures and industrial values.

Description

The method for making of safety helmet of bicycle rider

The present invention relates to helmet field, particularly the method for making of safety helmet of bicycle rider.

The use of crash helmet is of long duration; helmet is a kind ofly to protect human head to avoid in work, injured effective measures by bus and even in the recreation; yet the prior art helmet is made through the multiple tracks machining clearance; its product is except that not having the air permeability; make us again when wearing feeling sultry discomfort, thereby make many people be reluctant to wear, owing to there is not helmet protection; the cyclist just is easy to make head injuries in case run into the traffic accident of burst between travelling, even threat to life.

The objective of the invention is to: provide a kind of and have industrial value, be convenient to produce, accord with safety standard, can integrated safety helmet of bicycle rider manufacture method.

The objective of the invention is to reach like this: will be by as the patrix of inner helmet shaping mould with as the mould that the bed die of helmet appearance shaping mould the is formed preheating of heating, plastic sheeting is covered on the bed die after the preheating of heating, and when the plastic foil softening transform, polyurethane foamed body is injected mould, cover patrix rapidly, the pressure that produces in temperature that produces by foamable reaction and the mould, make the plastic sheeting expansion and be extruded into the default shape of bed die, in the foaming action at the end, by with the internal layer printing or be coated with the combining of plastic sheeting of printing ink color and luster, make this plastic sheeting and the polyurethane foamed body all-in-one-piece crash helmet of combining closely, thereby purpose of the present invention has reached fully just.

Be elaborated for the present invention below in conjunction with accompanying drawing.

Accompanying drawing 1 is the process block diagram of the inventive method.

Accompanying drawing 2 is the profiles in the helmet manufacture process of the present invention.

Accompanying drawing 3 is one of outward appearances of embodiment of the invention finished product.

Accompanying drawing 1 is the calcspar of method for making flow process of the present invention, and from this figure as can be known, the inventive method has 10 steps, that is: a) the mould preheating of heating b) is covered plastic sheeting on the bed die; C) softening transform; D) inject foaming body; E) cover mould rapidly; F) foaming expansion; G) connecting shaping; H) demoulding cooling; I) hole is opened up in deburring; J) assembling.

The method for making of safety helmet of bicycle rider provided by the present invention is a kind of method of making crash helmet with polyurethane (Polyurethane) foamed plastics, wherein, make particularly that intensity is enough, shock-resistant, one-body molded, work simplification, and have the method for making of the crash helmet of industrial value.Meeting above-mentioned requirements is polyurethane (hereinafter to be referred as PU) through generally acknowledged material also, and it is a kind of Polymer Synthesizing material, can be in order to make various patterns; The high level of utilization PU is intersected and is linked, and can produce low elasticity and soft good shock-proof effect, and therefore, its foaming body can be used as highly sensitive electronic instrument packaging material, the interior annex of automobile etc.; PU also is a kind of durable plastic CAB foaming body that has, and therefore can be used as heat-barrier material; PU has the hard of high density and fine cell structure and foaming body full of elasticity, is applicable to the mould parts that needs high crooked drag, load compression power.Because PU has these advantages, PU material and good technology are combined can be used in and make in light weightly, safe, comfortable, have on the variable product in form or in the utilization.

PU is except in light weight and comfortable, and its shock-absorbing and impact resistance can both satisfy the most important necessary condition of crash helmet material of making.The present invention makes crash helmet with this PU material just because it can shock resistance, absorb the characteristic energy of brisance, prevent that cyclist's head is subjected to major injury, in order to increase security by bike; It in light weight, heat insulation with and profile the cyclist is worn feel comfortably cool.

Of the present invention how focusing on PU material and plastic sheeting in a continuous production process makes both be combined into one crash helmets of moulding by each processing step.

From accompanying drawing 2 as seen, mould therefor of the present invention is by forming as the patrix 1 of inner helmet moulding with as the bed die 2 of helmet appearance moulding, both are synthetic then to be the hollow space of a safety helmet of bicycle rider shape, be provided with the air-vents 11 of most preparations on patrix 1 top, ventilative usefulness when being used to irritate mould.

The method for making that the helmet sent out complete by bicycle of the present invention mainly is that plastic sheeting 3 is covered on the bed die 2 after the preheating, and after when this plastic sheeting is softening, being injected into PU foaming body 4 in the mould, seal mould rapidly, temperature and pressure by the foaming generation, plastic sheeting 3 is pushed through expansion is extruded into the default shape of bed die, in foaming action at the end, by with the internal layer printing or be coated with the printing ink color and luster plastic sheeting combine the crash helmet shape that this plastic sheeting and PU foaming body 4 are closely struck up partnership.

Below 10 processing steps are described in detail as follows:

A) the mould preheating of heating: make to maintain 40～60 ℃;

B) covered with plastic film 3 on bed die 2; Print in advance or the plastic sheeting 3 that is coated with the printing ink color and luster is covered on the bed die 2 after the preheating of heating with internal layer;

C) softening transform: plastic sheeting 3 is met thermal softening and is changed, and in the recessed hollow space that invests in the bed die 2;

D) inject foaming body: inject PU foaming body 4 in the softening bed die dented space that forms of plastic sheeting;

E) cover mould rapidly;

F) foaming expansion: the mould that will have PU foaming body 4 is put into reacting furnace, the reacting furnace temperature is 120～150 ℃, and control mould instantaneous temperature is 70～90 ℃, waits for peacefully the foaming action, during the foaming beginning, PU liquid is foam filled rapidly, expands to fill up in the whole die cavity pressure as expansionary force that produces during by foaming, make softening plastic sheeting be extruded into the default shape of bed die, and in filling process, the gas that produced of foaming fills up gradually and prepares certainly in the pore 11 and discharge with die cavity;

G) connecting shaping: the exothermic reaction during in conjunction with foaming, keeping mold temperature is 70～90 ℃, foot is integral the plastic sheeting fluid-tight engagement in PU foaming body and internal layer printing or dope mass colour pool under this temperature, and the printing ink color and luster can make product have colour and pattern, increases the product aesthetic feeling;

H) demoulding cooling: the demoulding after 8～20 minutes, with the crash helmet semi-finished product taking-up of moulding, cooling naturally;

I) hole is opened up in deburring: above-mentioned helmet surface of semi-finished is opened up the hole, cut off unnecessary plastic sheeting limit, making becomes the crash helmet blank;

J) assembling: attach sponge around the crash helmet blank inner edge and in position wear colour band, fastener, the complete safe helmet.

Safety helmet of bicycle rider one example that accompanying drawing 3 just is to use the inventive method to make.Wherein, at above-mentioned i) also semi-finished product can be put into one in the step and fixedly cut off the mould of opening up the hole, make when cutting off unnecessary plastic sheeting the crash helmet of the multiple different patterns of output.

In the methods of the invention as the thicker or helmet outward appearance of set plastic sheeting form when complicated, at above-mentioned d) inject the foaming body step and can divide into perforation at bed die 2, reach by bleeding of vacuum-pumping equipment and make the fully purposes of distortion of wherein set plastic sheeting 3.

In addition in the methods of the invention, available moulding cap shelly semi-finished product replace the plastic sheeting of thin matter, thereby make the c of this method) and i) step omitted, can make crash helmet quickly.

According to the made crash helmet finished product of the inventive method except that have PU physique light, heat insulation good, intensity is enough, shock-resistant and shock-absorbing power well, also in the crash helmet foamed forming process, arranged the smooth beautiful plastic sheeting shell of one deck for the helmet in advance, will not handle formality through multiple tracks processing the prior art and just can obtain finished product thereby need not resemble.Therefore, the inventive method fabrication schedule is simplified, and manufacturing cost reduces, and is a kind of novel method for making that has the safety helmet of bicycle rider of industrial value.

Claims

1, the method for making of safety helmet of bicycle rider is characterized in that:

A) the mould preheating of heating: will make to maintain 40-60 ℃ as the patrix of inner helmet moulding with as the mould that the bed die of helmet appearance shaping mould the is formed preheating of heating:

B) internal layer is printed in advance or the plastic sheeting in dope mass colour pool covers on the bed die after the preheating;

C) softening transform: plastic sheeting is met thermal softening and is out of shape, and in the recessed hollow space that invests bed die;

D) inject foaming body: inject polyurethane foamed body in the softening bed die dented space that forms of plastic sheeting:

E) news speed covers mould;

F) foaming expansion: the mould that will have polyurethane foamed body is put into reacting furnace, the reacting furnace temperature is 120-150 ℃, control mould instantaneous temperature is 70-90 ℃, wait for peacefully the foaming action, during the foaming beginning, polyurethane liquid is foam filled rapidly, expands and fills up in the whole die cavity, by the pressure as expansionary force of foaming to producing, softening plastic sheeting is extruded into the default shape of bed die;

G) connecting shaping: in conjunction with the exothermic reaction in when foaming, keep mold temperature and be 70 1 fourths of the twelve Earthly Branches ℃, the plastic sheeting fluid-tight engagement that makes polyurethane foamed body and internal layer printing or be coated with the printing ink color and luster is integral;

H) demoulding cooling: the demoulding after 8-20 minute, with the crash helmet semi-finished product taking-up of moulding, cooling naturally:

J) assembling: around crash helmet blank inner edge, attach sponge and in position wear colour band and fastener, promptly become the crash helmet finished product.

2, according to the method for making of the said crash helmet of claim 1, it is characterized in that: the step d that in the softening bed die dented space that forms of plastic sheeting, injects polyurethane foamed body), divide into perforation at bed die, by bleeding of vacuum-pumping equipment, wherein set plastic sheeting fully is out of shape.