DK159139B

DK159139B - Procedure for the production of flat items such as nap lined mats

Info

Publication number: DK159139B
Application number: DK364088A
Authority: DK
Inventors: John Hewlett Parkins; Aage Lang
Original assignee: Milliken Denmark
Priority date: 1988-06-30
Filing date: 1988-06-30
Publication date: 1990-09-10
Also published as: DK364088A; DK159139C; JP2661723B2; JPH0234311A; DK364088D0

Abstract

During a procedure for the production of flat items such as nap-lined mats with a rubber backing on a vulcanising press (P) with a stationary vulcanising heating plate (8), the items (1) to be vulcanised are conveyed into place, in and out of the press (P), with the help of a heat conducting conveyor belt (9). Via the fact that each of the vulcanised items (1), shortly before they are conveyed from the conveyor belt (9) into the press (P), are subject to a heating process at a heating station (PH) for the heating of the items (1) to a temperature which lies between 4-90 degrees C, preferably 20 degrees C, below that of the vulcanising temperature used in the press (P), and that the conveyor belt (9) on the transportation of each item, is projected in a direction away from the pre-heating station (PH) towards the pressing station (P), a substantial reduction of the vulcanising time in the press (P) is achieved, with a corresponding increase in production speed which especially, but not exclusively, becomes important if the items are conveyed on the conveyor belt (9) on a plate (16) for the moulding of the items' base during press vulcanising operations.<IMAGE>

Description

DK 159139 BDK 159139 B

Opfindelsen angår en fremgangsmåde til fremstilling af flade emner, såsom luvforsynede måtter med kautsjukbagside på en vulkaniseringspresse med en stationær vulkaniseringsvarmeplade, hvor emnerne, der skal vulkani-5 seres, føres ind på plads i og ud af pressen ved hjælp af et variifieledende transportbånd.BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a method of producing flat blanks, such as padded rubber backing mats on a vulcanization press with a stationary vulcanization heating plate, wherein the blanks to be vulcanized are inserted into and out of the press by means of a variable conductive conveyor belt.

I hidtil kendte presser af denne art har måtterne vekselvis været ført ind i pressen fra pressens to sider, således som det er kendt fra USA-patent nr. 4.447.201.In prior art presses of this kind, the mats have alternately been inserted into the press from the two sides of the press, as is known from US Patent No. 4,447,201.

10 Ved denne fremgangsmåde har der hidtil været sat en øvre grænse for antallet af fremstillede emner, hvilken grænse var bestemt af pressevulkaniseringsoperationens varighed.Thus far, an upper limit has been set for the number of blanks manufactured, which limit was determined by the duration of the press vulcanization operation.

Det er opfindelsens formål at afkorte pressevulkani-15 seringsoperationens varighed uden at behøve at forøge pressens og dermed dennes varmeplades størrelse.It is an object of the invention to shorten the duration of the pressing vulcanization operation without having to increase the size of the press and hence its heating plate.

Dette opnås ifølge opfindelsen ved en fremgangsmåde, der er ejendommelig ved, at hvert af de vulkaniserede emner straks før de af transportbåndet føres ind i pressen, 20 udsættes for et forvarmningstrin på en forvarmningsstation til opvarmning af emnerne til en temperatur, der ligger 4-90°C, fortrinsvis 20°C, under den i pressen anvendte vulkaniseringstemperatur, og at transportbåndet ved hver emnetransportoperation forskydes i retning fra forvarme-25 stationen mod pressestationen. Derved opnås en væsentlig afkortning af vulkaniseringstiden i pressen til tilsvarende forøgelse af fremstillingshastigheden, hvilket især, men ikke udelukkende, har betydning, hvis emnerne fremføres på transportbåndet på en plade til formgivning af 30 emnernes underside under pressevulkaniseringsoperationerne, idet en sådan formgivningsplade typisk forsinker vulkaniseringstiden, dels på grund af den plastiske deformation af emnernes underside og dels på grund af formgivningspladens eget varmeforbrug.This is achieved in accordance with the invention by a method characterized in that each of the vulcanized articles, prior to being brought into the press by the conveyor belt, is subjected to a preheating step at a preheating station for heating the articles to a temperature of 4-90 ° C, preferably 20 ° C, below the vulcanization temperature used in the press, and for each workpiece conveying operation, the conveyor belt is displaced in the direction from the preheat station to the press station. Thereby, a substantial shortening of the vulcanization time in the press is achieved for correspondingly increasing the production rate, which is particularly, but not exclusively, important if the articles are conveyed on the conveyor belt on a plate for shaping the underside of the articles during the press vulcanization operations, such a forming plate typically delaying the vulcanization time. partly because of the plastic deformation of the underside of the workpieces and partly because of the design plate's own heat consumption.

35 Gasserne og dampene fra emnerne under forvarmningen suges hensigtsmæssigt bort via en udsugningshætte.35 The gases and vapors from the blanks during preheating are suitably sucked off via a suction hood.

Forvarmningen sker hensigtsmæssigt fra en varmeplade under transportbåndet på forvarmningsstationen.The preheating is conveniently done from a hot plate under the conveyor belt at the preheating station.

22

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På grund af den store gas- og dampdannelse under den kortvarige presseoperation er der hensigtsmæssigt i det mindste delvist rundt langs pressen i niveau med dennes pressemembran anbragt en udsugningskanal med nedadvendte 5 sugeåbninger til udsugning af dampe og gasser fra emnerne under pressevulkaniseringsoperationen.Conveniently, due to the large gas and vapor formation during the short press operation, at least partially around the press, at the level of its press membrane, a suction duct is provided with downwardly directed 5 suction openings for extracting vapors and gases from the blanks during the press vulcanization operation.

Ved at pressemembranens presseflade har et længde-bredde-forhold på 1,5-20, fortrinsvis 3,75, opnås, at udsugningskanaler ved pressens korte sider kan undværes, idet gasser 10 og dampe fra emnerne vil være mest tilbøjelige til at undvige langs pressefladens længdekanter.By having a length-to-width ratio of 1.5-20, preferably 3.75, of the press membrane of the press membrane, suction channels at the short sides of the press can be avoided, as gases 10 and vapors from the blanks will be most likely to dodge along the press surface of the press. length edges.

Opfindelsen vil i det følgende blive nærmere forklaret i forbindelse med et udførelseseksempel og under henvisning til tegningen, hvor 15 fig. 1 viser et anlæg til fremstilling af flade emner, såsom luvforsynede måtter med kautsjukbagside, og fig. 2 viser i snit en detalje af vulkaniseringspressen i 20 nærheden af dennes pressemembran.The invention will now be explained in more detail in connection with an exemplary embodiment and with reference to the drawing, in which FIG. 1 shows a plant for producing flat parts, such as padded rubber back mats; and FIG. 2 shows in section a detail of the vulcanization press in the vicinity of its pressing membrane.

Fig. 1 viser et emne 1 i form af en uvulkaniseret luvforsynet måtte med kautsjukbagside anbragt på anlæggets pålægningsstation A1, hvorfra emnet 1 trinvis føres igennem 25 anlæggets fem stationer, pålægningsstationen A1, forvarm-ningsstationen PH, pressevulkaniseringsstationen P, køle-og afgasningsstationen K og aflægningsstationen A2. Ved stationerne PH og P er anbragt varmeplader 8 henholdsvis til forvarmning af emnerne 1 og til vulkanisering af em-30 nerne 1, når de føres ind på den pågældende station med transportbåndet 9. Transportbåndet 9 fremføres trinvist mod højre ved hjælp af drivruller 10. Pålægning og aflægning af emnerne 1 sker på arbejdsborde 11. Udsugning af dampe og gasser fra forvarmningsstationen PH og fra 35 køle- og afgasningsstationen K sker ved hjælp af udsugningshætter 12, der er stationært anbragte. Under køle- og aftagningsstationen kan hensigtsmæssigt være anbragt et 3FIG. 1 shows a blank 1 in the form of an unvulcanized padded mat having a rubber backing positioned on the laying station A1 of the plant, from which the blank 1 is gradually passed through the five stations of the plant, the laying station A1, the preheating station PH, the pressing vulcanizing station P, the cooling and degassing station K . At the stations PH and P, heating plates 8 are arranged, respectively, for preheating the blanks 1 and for vulcanizing the blanks 1 as they are brought into the respective station with the conveyor belt 9. The conveyor belt 9 is advanced stepwise to the right by means of drive rollers 10. and deposition of the workpieces 1 takes place on work tables 11. Extraction of vapors and gases from the preheating station PH and from the cooling and degassing station K takes place by means of extraction hoods 12 which are stationary. Conveniently, a 3 may be located below the cooling and take-off station

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kølebord 15 til afkøling af emnerne 1; via transportbåndet 9 og eventuelt via en undersideformgivningsplade 15, hvorpå emnerne er anbragt under deres transport gennem anlægget. Mellem de stationer, hvor der hersker store temperaturfor-5 skelle mellem bordene, er anbragt varmeisolerende bordsek-tioner 17 til understøtning af transportbåndet 9. I fig. 1 er også eksempelvis antydet en nedadvendt damp- og afgas-ningskanal 18, der som nævnt enten kan være anbragt langs pressens længste sider målt i vandret plan eller hele vejen 10 rundt langs pressen i niveau med dennes pressemembran 19.cooling table 15 for cooling the items 1; via the conveyor belt 9 and optionally via an underside forming plate 15, on which the articles are arranged during their transport through the plant. Between the stations where there are large temperature differences between the tables, heat-insulating table sections 17 are placed to support the conveyor belt 9. In FIG. 1 is also indicated, for example, by a downwardly directed steam and degassing channel 18 which, as mentioned, may be arranged along the longest sides of the press measured in a horizontal plane or all the way around the press at the level of its press membrane 19.

Bånder 9 er endeløst og føres mellem to drivruller 10, idet båndet 9 passerer igennem en dertil udformet åbning i pressen, idet der naturligvis også er gjort plads til båndet under bordene 11 og 15 samt under 15 varmepladen 8 i forvarmningsstationen PH.Bandages 9 are endless and are passed between two drive rollers 10, the band 9 passing through a formed opening in the press, of course making room for the band under the tables 11 and 15 as well as under the heating plate 8 in the preheating station PH.

Fig. 2 viser en detalje i pressen, hvor der mellem transportbåndet 9 og pressemembranen 19 er anbragt en dug 21, der som vist er endeløs og ophængt ved begge sine ender om bærevalser 22. Kun halvdelen af et snit 20 gennem pressen P er vist, og den i fig. 1 viste udsugningskanal 18 ses i større målestok. Ved måttens indføringssted til pressen P er antydet en eftergivelig afskærmning af et eftergiveligt, varmebestandigt materiale, der tillader emner at passere ind og ud af pressen foruden 25 eventuel lugt fra omgivelserne, hvis undertrykket i udsugningskanalen 18 betinger dette.FIG. 2 shows a detail in the press where between the conveyor belt 9 and the press membrane 19 is arranged a tab 21 which is shown endless and suspended at both its ends by support rollers 22. Only half of a cut 20 through the press P is shown, and the in FIG. 1, suction duct 18 shown on a larger scale. At the point of insertion of the mat to the press P is indicated a resilient shielding of a resilient, heat-resistant material which allows articles to pass in and out of the press in addition to any odor from the environment if the vacuum in the suction duct 18 does so.

På grund af den nævnte dug og ikke mindst på grund af nævnte forvarmning har det vist sig, at også emner med højt fugtindhold, f.eks. 3-5 vægtprocent fugt eller 30 mere, kan pressevulkaniseres på den korte presseoperationstid uden emnebeskadigelse til følge.Because of the dew mentioned and not least because of the preheating, it has been found that also high moisture content, e.g. 3-5 wt.% Moisture or 30 more, can be vulcanized in the short press operation time without damage to the workpiece.

Mindst en af bærevalserne 22 er parallelforskydeligt lejret i pressens membranbærende part, således at dugen 21 kan slækkes og strammes i afhængighed af, om membranen 19 35 udspiles af et trykmediumtryk eller suges tilbage af et undertryk over membranen 19.At least one of the support rollers 22 is slidably mounted parallel to the diaphragm-carrying portion of the press, so that the tablecloth 21 can be slackened and tightened depending on whether the diaphragm 19 35 is played out by a pressure medium pressure or is sucked back by a negative pressure across the diaphragm 19.

Udsugningshætten 12 over kølebordet 15 kan i stedet for som nævnt at være stationært anbragt, være højdeforsky- 4The suction cap 12 over the cooling table 15 may, instead of being stationary, be height-shifted, as mentioned above.

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deligt anbragt, hvorved arbejdsbordet 11 efter kølebordet 15 kan spares, idet kølebordet 15 da udnyttes som både kølebord og aftagningsbord for færdigvulkaniserede emner.partially positioned, whereby the workbench 11 after the cooling table 15 can be saved, the cooling table 15 being then utilized as both cooling table and take-off table for finished vulcanized items.

Claims

A method of manufacturing flat items, such as padded mats (1) with rubber backing, on a vulcanization press (P) with a stationary vulcanization heating plate (8), wherein the items (1) to be vulcanized are inserted into place in and out of the press (P) from one side thereof by means of a heat-conducting conveyor belt (9), characterized in that each of the vulcanized articles (1) is immediately exposed to the press (Pj) by the conveyor belt (9). for a preheating stage of a preheating station (PH) for heating the blanks (1) to a temperature of 4-90 ° C, preferably 20 ° C, below the vulcanization temperature used in the press (P), and that the conveyor belt ( 9) at each workpiece transport operation, it is displaced in the direction from the preheating station (PH) towards the press station (P).

Process according to claim 1, characterized in that the gases and vapors from the blanks (1) are sucked off during the preheating via a suction cap (12).

Method according to claim 1 or 2, characterized in that the preheating takes place from a heating plate (8) under the conveyor belt (9) of the preheating station (PH).

Method according to claim 1, 2 or 3, characterized in that at least partly around the press, at the level of its press membrane, an exhaust duct is provided for extracting vapors and gases from the blanks during the press vulcanization operation.

Method according to claim 1, 2 or 3, characterized in that the pressing surface of the membrane has a length to width ratio of 1.5-20, preferably 3.75.